WO2018120861A1 - Method and device for obtaining and processing backlight brightness data, and liquid crystal display device - Google Patents

Abstract

The present invention relates to the technical field of display, and discloses a method for obtaining and processing backlight brightness data, and a liquid crystal display device. The method comprises: receiving a PWM dimming signal sent by a PWM controller (201); determining whether the received PWM dimming signal comprises preset hopping or not (202); if the PWM dimming signal comprises the preset hopping, sending a reading instruction to an optical sensor unit within the set time after the preset hopping (203); and receiving backlight brightness data obtained by the optical sensor unit according to the reading instruction (204). The solution achieves the purpose of improving the stability of the backlight brightness data.

Description

Backlight brightness data acquisition and processing method, device, liquid crystal display device

Related application cross-reference

This application claims priority to Chinese Patent Application No. 201611234350.X, entitled "Getting Backlight Brightness and Its Data Processing Method, Device, Liquid Crystal Display Device", which was submitted to the Chinese Patent Office on December 28, 2016. The entire contents are incorporated herein by reference.

Technical field

The present disclosure relates to the field of display technologies, and in particular, to a backlight brightness data acquisition and processing method and apparatus, and a liquid crystal display device.

Background technique

Currently, display devices require more and more accurate display of image content, and achieving accurate display of image content of the display device requires that the brightness of the display device remains stable.

As shown in FIG. 1 , the conventional display device includes a display component 101 , a backlight module 102 , a backlight driving device 103 , a PWM (Pulse Width Modulation) controller 104 , a photo sensor device 105 , and a brightness data processor 106 . The display component 101 is configured to receive and display an image. The backlight module 102 is used to provide a backlight for the display assembly 101 so that the display assembly 101 displays an image. The backlight driving device 103 is configured to provide driving power to the backlight module according to the PWM dimming signal provided by the PWM controller 104, so that the backlight module 102 emits light to provide backlighting for the display component 101. The brightness data processor 106 is configured to adjust the duty ratio of the PWM dimming signal provided by the PWM controller 104 according to the brightness data of the backlight provided by the backlight module 102 obtained by the photo sensor device 105, so that the backlight module 102 is adjusted. A brightness-stabilized backlight is provided for display component 101.

At present, the brightness of the backlight of the backlight module 102 is stabilized by the display device: the brightness data processor 106 sends a read command to the light sensor device 105, and the light sensor device 105 receives the read command and reads the backlight module 102. The brightness data of the backlight is provided and sent to the brightness data processor 106. In the above manner, the brightness data processor 106 acquires the brightness data of a certain number of times, calculates the average brightness data, and compares the calculated average brightness data with the current brightness data of the backlight module 102, and compares with the target brightness data, according to the comparison result. The duty ratio of the PWM dimming signal provided by the PWM controller 104 is adjusted so that the backlight luminance data of the backlight module 102 is the target luminance data.

Summary of the invention

The present disclosure provides a method and apparatus for acquiring and processing backlight brightness data, and a liquid crystal display device.

According to a first aspect of the embodiments of the present disclosure, a method for acquiring backlight luminance data is provided, which is applied to a liquid crystal display device incorporating a photosensor device, the method comprising: receiving a PWM dimming signal sent by a PWM controller; Whether the received PWM dimming signal includes a preset hopping; if the PWM dimming signal includes the preset hopping, sending a read to the optical sensor device at a set time after the preset hopping Taking instruction; receiving backlight brightness data acquired by the photo sensor device according to the read instruction.

According to a second aspect of the embodiments of the present disclosure, there is provided a backlight brightness data processing method, comprising: acquiring at least one backlight brightness data, wherein acquiring any one of the backlight brightness data comprises: obtaining by the embodiment of the first aspect described above a method for backlight luminance data, acquiring any one of the backlight luminance data; and determining, according to the at least one backlight luminance data, current luminance data corresponding to the PWM dimming signal at a current duty ratio.

According to a third aspect of the embodiments of the present disclosure, a liquid crystal display device includes: a display component, a backlight module that provides a backlight for the display component, a backlight driving device, a PWM controller, a photo sensor device, a processor, And a memory for storing the program code; the backlight module is connected to the backlight driving device; the PWM controller is connected to the backlight driving device; the photo sensor device is disposed at the backlight module, and The processor is connected to the PWM controller and the memory, and is configured to read program code stored in the memory, and is configured to: receive PWM dimming sent by the PWM controller a signal; determining whether the received PWM dimming signal includes a preset hopping; if the PWM dimming signal includes the preset hopping, then setting the time after the preset hopping to the The light sensor device transmits a read command; and receives backlight brightness data acquired by the light sensor device according to the read command.

DRAWINGS

The accompanying drawings, which are incorporated in the specification

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the embodiments or the prior art description will be briefly described below, and it will be apparent to those skilled in the art that In other words, other drawings can be obtained based on these drawings without paying for creative labor.

1 is a schematic structural view of a display device;

2 is a schematic diagram of a sampling time of luminance data of a photosensor device;

FIG. 3 is a schematic flowchart diagram of a method for acquiring backlight luminance data according to an embodiment of the present disclosure;

FIG. 4 is a schematic flowchart diagram of a method for processing backlight luminance data according to an embodiment of the present disclosure;

FIG. 5 is a schematic flowchart diagram of another method for processing backlight brightness data according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of an apparatus for acquiring backlight luminance data according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a backlight luminance data processing apparatus according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present disclosure.

detailed description

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. The following description refers to the same or similar elements in the different figures unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with aspects of the present disclosure as detailed in the appended claims.

Taking FIG. 1 as an example, in the related art, generally, the brightness data processor 106 sends a read command to the light sensor device 105 to be randomly transmitted. Thus, for each sampling of the luminance data, the transmission time at which the luminance data processor 106 sends the read command to the optical sensor device 105 is not completely the same, which will cause the sampling time point of the luminance data of the photosensor device 105 to change. That is, the sampling time point may start at any time in the time when the PWM signal is high level and low level, as shown in FIG. 2 . As can be seen from FIG. 2, although the integration time TS0 and TS1 of the light sensor device 105 for each sampling of the luminance data are equal, the opening and closing times of the backlight module 102 corresponding to each sampling integration time are different, resulting in In the sampling integration times TS0 and TS1, the luminance data read by the photosensor device 105 is different. In this way, the brightness data of the certain number of times acquired by the brightness data processor 106 has a large difference, and the calculated current brightness data of the backlight module 102 is inaccurate. When the current brightness data is different from the target brightness data, the brightness is different. The adjustment of the duty cycle of the PWM dimming signal provided by the PWM controller 104 by the data processor 106 is also inaccurate, resulting in the backlight brightness of the backlight module 102 becoming more unstable.

FIG. 3 is a flowchart of a method of acquiring backlight luminance data, according to an embodiment of the present disclosure. This method is applied to a liquid crystal display device incorporating a photosensor device. As shown in FIG. 3, the method includes:

Step 201: Receive a PWM dimming signal sent by a PWM controller.

The PWM controller can periodically transmit the PWM dimming signal to the device for acquiring the backlight luminance data, so that the device for acquiring the backlight luminance data can know the duty ratio of the current PWM dimming signal. The device that obtains the backlight luminance data can receive the PWM dimming signal sent by the PWM controller.

Step 202: Determine whether the received PWM dimming signal includes a preset hopping.

The brightness of the backlight provided by the backlight module is determined by the duty cycle of the PWM dimming signal. Therefore, when adjusting the brightness of the backlight of the backlight module, it is necessary to adjust the current duty ratio of the PWM dimming signal. The adjustment of the duty ratio of the PWM dimming signal needs to be determined according to the brightness data of the backlight provided by the backlight module. In order to ensure the stability of the brightness of the backlight provided by the backlight module, it is necessary to periodically detect the brightness data of the backlight provided by the backlight module, and when the brightness data is not the target brightness data, the brightness of the backlight provided by the backlight module is illustrated. In the change, the current duty ratio of the PWM dimming signal needs to be adjusted, so that the brightness data of the backlight provided by the backlight module is re-targeted to achieve the brightness of the backlight provided by the backlight module. For the above reasons, the device for acquiring the backlight brightness data needs to obtain the brightness data of the backlight provided by the backlight module.

In the related art, the transmission time for transmitting the read command to the photosensor device is random and has no regularity. This causes the time of the read command received by the photosensor device to be unstable, so that the backlight luminance data collected each time is the backlight luminance data at different times of the PWM dimming period, as shown in FIG. 2 . In the embodiment of the present disclosure, in order to realize the regular transmission of the read command to the photosensor device, it is necessary to set the time for transmitting the read command. The set time for sending a read command requires a reference time, which is the start time of the time when the read command is sent. Since the device for acquiring the backlight luminance data needs to send the read command to the photosensor device a plurality of times, the reference time needs to be the same for each time the read command is sent to the photosensor device, so that the device for obtaining the backlight luminance data can be realized to the photosensor device. The time to send a read command is stable, rather than being sent randomly, so that the calculated brightness is accurate. Illustratively, since the device that acquires the backlight luminance data can periodically receive the PWM dimming signal, it can be detected that the received PWM dimming signal includes the preset hopping time as the reference time.

At this time, after receiving the PWM dimming signal sent by the PWM controller, the device for acquiring the backlight luminance data needs to detect whether the PWM dimming signal includes a preset hopping.

Further, the preset transition includes: a rising edge transition of the signal and/or a falling edge of the signal.

At this time, determining whether the received PWM dimming signal includes a preset jump includes:

Detect whether the received PWM dimming signal contains a rising edge transition of the signal and/or a falling edge transition of the signal.

That is, in one case, when the preset transition includes a rising edge transition, the device that acquires the backlight luminance data detects whether the PWM dimming signal has a rising edge transition after receiving the PWM dimming signal. When the PWM dimming signal has a rising edge transition, it is determined that the PWM dimming signal includes a preset transition. In another case, when the preset transition includes a falling edge transition, the device for acquiring backlight luminance data detects whether the PWM dimming signal has a falling edge transition after receiving the PWM dimming signal. When the PWM dimming signal has a falling edge transition, it is determined that the PWM dimming signal includes a preset transition. In another case, when the preset transition includes a rising edge transition and a falling edge transition, the device for acquiring the backlight luminance data detects whether the PWM dimming signal has a rising edge jump after receiving the PWM dimming signal. The change and the falling edge jump. When the PWM dimming signal has a rising edge transition and a falling edge transition, it is determined that the PWM dimming signal includes a preset transition.

It should be noted that, when determining whether the PWM dimming signal includes a preset hopping, the device may detect whether the received PWM dimming signal has a preset voltage change, that is, whether the PWM dimming signal has detection The voltage change corresponding to the rising edge transition and/or the voltage change corresponding to the falling edge transition. Of course, there may be other ways to determine whether the PWM dimming signal includes a preset hopping, which is not limited by the embodiment of the present disclosure.

Illustratively, in one case, it is assumed that the preset hop transitions to a rising edge transition and a falling edge transition of the signal. After receiving the PWM dimming signal sent by the PWM controller, the device for obtaining the backlight luminance data determines whether the PWM dimming signal includes a rising edge transition and a falling edge transition, that is, detecting whether the PWM dimming signal is a complete cycle. Dimming signal. If it is detected that the PWM dimming signal includes a rising edge transition and a falling edge transition, it can be determined that the PWM dimming signal is a full period dimming signal.

Illustratively, the dimming period of the PWM signal can be determined by detecting the time interval between the rising edge and the adjacent falling edge, or the dimming period of the PWM signal can be directly read from the pre-stored position.

Step 203: If the PWM dimming signal includes a preset jump, send a read command to the photosensor device at a set time after the preset jump.

After determining that the PWM dimming signal includes a preset hopping, the device that detects the PWM dimming signal including the preset hopping may be used as the reference time, and starts counting at the reference time, and reaches the setting. After the time, a read command is sent to the photosensor device. That is, the device for acquiring the backlight luminance data sends a read command to the photosensor after the interval is set after detecting that the PWM dimming signal includes the preset transition.

The set time for transmitting the read command may be the same for each backlight brightness data sample. That is to say, each time the backlight brightness data is acquired, after determining that the received PWM dimming signal includes a preset jump, when the set time is reached, a read command is sent to the photosensor device and sampled. As an implementation manner, the sampling includes at least two batches of sampling, and the sampling time of each batch sampling is the same time point of the dimming period, and there is a corresponding delay between the samplings of different batches. Taking two batches of sampling as an example, in the adjacent multiple PWM dimming cycles, the first batch of samples is taken at the time T1 after the start of the rising edge, and then the second batch is performed at the time T2 after the start of the rising edge. Sampling. According to another implementation, the duration of each sample described above may be set such that the sample of the duration reflects the brightness value at the current duty cycle. According to another implementation manner, in each PWM dimming period, after the read command is sent to the photosensor device and the sampling is performed, the backlight luminance data is collected multiple times at a certain time interval, thereby calculating More accurate backlight brightness value. In this way, the device for acquiring the backlight luminance data sends the read command to the photosensor device. The time is the same time in each PWM dimming period, so that the time period in which the photosensor device collects the backlight luminance data is a fixed period of time in the PWM dimming period, so that the backlight luminance data collected by the photosensor device is stable. .

As described in the above example, in one case, the apparatus for acquiring backlight luminance data can determine that the PWM dimming signal includes a rising edge jump after determining that the PWM dimming signal includes a rising edge transition and a falling edge transition. The time of the change and the falling edge jump starts, and after the set time is reached, a read command is sent to the photosensor device.

Illustratively, after the set time is reached, the read command is sent to the photosensor device, considering the time consumed by the signal transmission and the device response time. In order to read the backlight luminance data, the sampling period is compared with the dimming period. The time is relatively determined during the dimming cycle.

Step 204: Receive backlight brightness data acquired by the light sensor device according to the read instruction.

After receiving the read command, the light sensor device can collect the brightness data of the backlight provided by the backlight module, that is, the backlight brightness data, and send the acquired backlight brightness data to the device for acquiring the backlight brightness data. The device for acquiring backlight luminance data receives backlight luminance data acquired by the light sensor device according to the read command.

As described in the above example, after receiving the read command, the optical sensor device can collect the brightness data of the backlight provided by the backlight module, that is, the backlight brightness data, and send the acquired backlight brightness data to the device for acquiring the backlight brightness data. A device that acquires backlight luminance data can acquire backlight luminance data.

Exemplarily, the light sensor device can acquire backlight brightness data in a high level period in the PWM signal, and acquire backlight brightness data in a low level period in the PWM signal, so that the display can be calculated according to the dimming period of the PWM signal. brightness. As an implementation manner, in a statistical period, the ratio of the cumulative number of times the light sensor component collects the backlight luminance data in the corresponding period of the high level to the cumulative number of times the backlight luminance data is collected in the time period corresponding to the low level may be compared with the PWM. The ratio of the high level duration to the low level duration in the dimming cycle is equal. In an example, assuming that the ratio of the high level duration to the low level duration in the current PWM dimming signal is 3:1, the set time and the sampling time interval may be set, for example, to enable acquisition in the corresponding period of the high level. The ratio of the cumulative number of times of the backlight luminance data to the cumulative number of times of collecting the backlight luminance data in the time period corresponding to the low level is also 3:1, and the accurate backlight brightness corresponding to the current PWM dimming signal can be calculated by using the sampled data. value. As another implementation, multiple sampling at equal intervals may be performed during the dimming period, and then an average is obtained based on the sampling result.

In this way, when acquiring the backlight brightness data, the device for transmitting the backlight brightness data may send a read command to the photosensor device at the set time after determining that the received PWM dimming signal includes the preset jump, instead of Randomly transmitting, so that the sending read command has a time basis, that is, the time for transmitting the read command for the device for acquiring the backlight brightness data is more stable, so that the time for the optical sensor device to receive the read command is more stable, and the optical sensor device obtains The backlight brightness data is more stable, thereby improving the stability of the backlight brightness of the display device.

As shown in FIG. 4, an embodiment of the present disclosure provides a method for processing backlight luminance data, including:

Step 301: Acquire at least one backlight brightness data.

The obtaining the backlight brightness data includes: obtaining the backlight brightness data by using the method for acquiring backlight brightness data according to the foregoing embodiment. A backlight brightness data may be backlight brightness data obtained by each sampling, or may be backlight brightness data received after a read command is sent.

The backlight brightness data processing device needs to acquire at least one backlight brightness data. In one implementation, when each backlight luminance data is acquired, the backlight luminance data may be acquired through the above steps 201-204. In another implementation, steps 201 and 202 are not necessary to obtain some of the backlight luminance data(s).

Further, when at least one backlight brightness data is acquired, the set time in the above step 203 may be the same or different.

确定的。When the set time is the same, the set time for transmitting the read command may be the same for at least one backlight luminance data. That is to say, when each backlight brightness data is acquired, after determining that the PWM dimming signal includes a preset jump, when the set time is reached, a read command is sent to the photosensor device and sampled. According to one implementation, the number of times of sampling of each of the backlight luminance data described above may be set such that the sampling of the number of times can reflect the luminance value at the current duty ratio. According to an implementation manner, in each PWM dimming period, after the reading command is sent to the photosensor device and the sampling is completed, the backlight brightness data is collected multiple times at a certain time interval, so that the calculation is accurate. The backlight brightness value. In this way, the time period during which the photosensor device collects each backlight luminance data is a fixed period of time within the PWM dimming period. When the set time is not the same, the set time includes: the set time is based on the number of received backlight brightness data, using the formula

definite.

Wherein, T _PWM is the period of the PWM dimming signal, x is the number of at least one backlight luminance data to be acquired for one period length, and i is the number of received backlight luminance data. It can be understood that "one cycle length" herein can mean that the x data needs to be acquired in one dimming cycle, or that the x data is acquired in multiple dimming cycles, but the manner of obtaining is obtained. It is equivalent to the case where all x data are acquired in one dimming cycle.

计算的。这样一来背光亮度数据处理装置每次发送的读取指令对应不同的读取指令的发送时间，以便光传感器件可以读取一个PWM调光周期长度中不同时间的背光亮度数据进而通过例如求平均值得到背光亮度平均值。通过公式

可以将PWM调光信号的周期划分为x个时间段，背光亮度数据处理装置在PWM调光信号的周期的不同的时间段内获取背光亮度数据，即为背光亮度数据处理装置将PWM调光信号的周期划分为至少一个时间段，背光亮度数 据处理装置在每个时间段内获取一次背光亮度数据，进而获取到至少一个背光亮度数据。作为一种实现方式，光传感器件在调光周期中高电平位置处对应的采集累积次数与在低电平位置处对应的采集累积次数的比值可以与PWM调光周期中高电平时长与低电平时长的比值相等。That is, the set time is that the backlight luminance data processing device uses the formula according to the number of backlight luminance data that has been received before transmitting the read command.

computational. In this way, the read command sent by the backlight brightness data processing device corresponds to the sending time of different read commands, so that the light sensor device can read the backlight brightness data at different times in the length of one PWM dimming cycle and then pass, for example, averaging. The value gives the average brightness of the backlight. Through formula

The period of the PWM dimming signal can be divided into x time segments, and the backlight brightness data processing device acquires the backlight brightness data in different periods of the period of the PWM dimming signal, that is, the backlight brightness data processing device converts the PWM dimming signal The period is divided into at least one time period, and the backlight brightness data processing device acquires the backlight brightness data once in each time period, thereby acquiring at least one backlight brightness data. As an implementation manner, the ratio of the cumulative number of acquisitions corresponding to the high-level position of the photosensor device in the dimming period to the cumulative number of acquisitions corresponding to the low-level position may be compared with the high-level duration and low-voltage of the PWM dimming period. The ratio of the usual length is equal.

确定的。Or, considering that the PWM controller provides the PWM signal and the backlight module provides a delay time between the backlights, the set time includes: the set time is based on the number of backlight luminance data that has been received, and the formula is used.

definite.

Where ΔT _c represents the delay time between the PWM controller providing the PWM signal and the backlight module providing the backlight.

或者，

这样背光亮度数据处理装置可以在预设跳变后间隔时间

或者，间隔时间

向光传感器件发送读取指令，此时光传感器件可以将获取的背光亮度数据发送至背光亮度数据处理装置，背光亮度数据处理装置可以获取到第q个背光亮度数据。其中，第q个背光亮度数据为至少一个背光亮度数据中的任一个背光亮度数据。In this way, the backlight brightness data processing device acquires the read command transmission time corresponding to the qth backlight luminance data, that is, the set time is

or,

Thus, the backlight brightness data processing device can be at intervals after the preset hopping

Or, the interval

The read command is sent to the photo sensor device. At this time, the photo sensor device can transmit the acquired backlight brightness data to the backlight brightness data processing device, and the backlight brightness data processing device can obtain the qth backlight brightness data. The qth backlight brightness data is any one of the at least one backlight brightness data.

向光传感器件发送读取指令并采样x个背光亮度数据。也就是说，这x个数据可在一个调光周期内获取，该调光周期中发送了x次读取指令，即读取了x个背光亮度数据。根据另一种实现方式，背光亮度数据处理装置可以在获取每个背光亮度数据时都从PWM控制器接收PWM调光信号并判断PWM调光信号是否包括预设跳变，在检测出PWM调光信号包括预设跳变时，以相应预设跳变时间为基准时间，间隔时间

向光传感器件发送一次读取指令并采样相应背光亮度数据，其中i为已接收的背光亮度数据的个数，该调光周期中仅发送了一次读取指令，也仅读取了一个背光亮度数据。也就是说，这x个数据是在多个调光周期内获取的。可以理解的是，不考虑响应延迟及显示设备中其他因素的影响，在调光周期的某一占空比下，根据上述两种实现方式获取的x个采样数据是一致的。According to an implementation manner, the backlight brightness data processing device may first detect that the PWM dimming signal sent by the received PWM controller includes a preset hopping, and preset the hopping time as a reference time.

A read command is sent to the photosensor device and x backlight luminance data is sampled. That is to say, the x data can be acquired in one dimming cycle, and x read commands are sent in the dimming cycle, that is, x backlight luminance data are read. According to another implementation manner, the backlight brightness data processing apparatus may receive the PWM dimming signal from the PWM controller and determine whether the PWM dimming signal includes a preset hopping when acquiring each backlight luminance data, and detect PWM dimming. When the signal includes a preset jump, the corresponding preset jump time is used as the reference time, and the interval time

Sending a read command to the light sensor device and sampling corresponding backlight brightness data, where i is the number of received backlight brightness data, only one read command is sent in the dimming cycle, and only one backlight brightness is read. data. That is, the x data is acquired over multiple dimming cycles. It can be understood that, regardless of the response delay and other factors in the display device, the x sample data acquired according to the above two implementation manners are consistent under a certain duty cycle of the dimming cycle.

Step 302: Determine, according to the at least one backlight luminance data, current luminance data corresponding to the PWM dimming signal at the current duty ratio.

After the backlight brightness data processing device acquires the at least one backlight brightness data, the current brightness data corresponding to the PWM dimming signal at the current duty ratio may be determined according to the acquired backlight brightness data. That is, in the When the backlight brightness data is obtained, the backlight brightness data processing device can use the acquired backlight brightness data as the current brightness data corresponding to the PWM dimming signal at the current duty ratio. The backlight brightness data processing device may calculate an average value of the at least one backlight brightness data to obtain current brightness data corresponding to a current duty ratio of the PWM dimming signal. That is, the backlight luminance data processing device calculates the average value of the at least one backlight luminance data, and uses the calculated average value as the current luminance data corresponding to the current duty ratio of the PWM dimming signal.

Further, in order to increase the accuracy of the current luminance data corresponding to the PWM dimming signal at the current duty ratio, the backlight luminance data processing device may increase the number of times the backlight luminance data is acquired, that is, obtain the first using at least one backlight luminance data. The brightness data, and further the current brightness data corresponding to the PWM dimming signal at the current duty cycle is obtained from the first brightness data.

At this time, determining, according to the at least one backlight luminance data, current luminance data corresponding to the PWM dimming signal at the current duty ratio, including:

The first brightness data is acquired according to the at least one backlight brightness data. It is determined whether the number of acquired first brightness data reaches a preset number. If the number of acquired first brightness data does not reach the preset number, the step of acquiring at least one backlight brightness data is performed again. If the number of the first brightness data that has been acquired reaches a preset number, the current brightness data corresponding to the PWM dimming signal at the current duty ratio is determined according to the acquired first brightness data.

That is to say, after acquiring the at least one backlight brightness data, the backlight brightness data processing device may calculate an average value of all or part of the data in the at least one backlight brightness data, and use the average value as a first brightness data. After the first brightness data is obtained, it can be checked whether the number of the obtained first brightness data reaches a preset number. If not, the backlight brightness data processing device needs to continue to acquire the first brightness data, and The brightness data is obtained according to the at least one backlight brightness data. Therefore, the at least one backlight brightness data needs to be re-acquired. In this case, step 301 is performed again, and the first brightness data is re-acquired according to the re-acquired at least one backlight brightness data. The number of acquired first brightness data reaches a preset number. When the number of the obtained first brightness data reaches a preset number, the preset brightness data may be used to determine the current brightness data corresponding to the PWM dimming signal at the current duty ratio.

When the preset number is one, the backlight brightness data processing device only acquires one first brightness data, and the obtained first brightness data can be used as the PWM dimming signal at the current duty ratio. Current brightness data.

When the preset number is an integer greater than 1, the backlight brightness data processing device may calculate an average value of the preset plurality of first brightness data to obtain current brightness data corresponding to the current duty ratio of the PWM dimming signal. That is, the backlight luminance data processing device calculates the average value of the preset first luminance data, and uses the calculated average value as the current luminance data corresponding to the current duty ratio of the PWM dimming signal.

Further, since there is a delay in the process of transmitting the read command to the photosensor device, each read command The delays sent to the photosensor device are not completely the same, resulting in a difference in the time each time the photosensor device receives the read command, which in turn causes the photosensor device to acquire the brightness data of the backlight at different times. However, in the liquid crystal display device, the difference between the maximum values of the luminance data of the backlights in different PWM dimming periods is small, and therefore, in order to improve the corresponding PWM dimming signal corresponding to the current duty ratio The accuracy of the current brightness data may be: when the first brightness data is acquired, the backlight brightness data with a larger value is selected in the acquired at least one backlight brightness data, and the first brightness is calculated by using the backlight brightness data with a larger value. The data improves the accuracy of the first brightness data, thereby improving the accuracy of the current brightness data corresponding to the PWM dimming signal at the current duty cycle.

At this time, according to the at least one backlight luminance data, acquiring the first luminance data includes: selecting, in the at least one backlight luminance data, n backlight luminance data. The average value of the n backlight luminance data is calculated to obtain first luminance data.

The backlight luminance data of any one of the n backlight luminance data is not less than any one of the k backlight luminance data. The k backlight luminance data is backlight luminance data other than n backlight luminance data in at least one backlight luminance data. n is an integer greater than 0 and not greater than the total number of the at least one backlight luminance data, and k is an integer greater than or equal to zero.

In order to further increase the stability of the first brightness data, the backlight brightness data may be selected from the at least one backlight brightness data acquired each time, and the average value of the n backlight brightness data is As the first brightness data.

Further, the specific method for the backlight brightness data processing device to select n backlight brightness data from the at least one backlight brightness data may be: the backlight brightness data processing device according to the value of the at least one backlight brightness data, according to the value of the at least one backlight brightness data. The sorting is performed from the largest to the smallest, so that the top n numerically large backlight luminance data is selected from the sorted at least one backlight luminance data.

It should be noted that the backlight brightness data processing device may also select n backlight brightness data in the at least one backlight brightness data by other means, which is not limited in the embodiment of the present disclosure.

In this way, the first brightness data can be obtained according to the maximum n backlight brightness data of the x backlight brightness data, so that the difference between the backlight brightness data used for calculating the first brightness data is small, and Increasing the accuracy of the current luminance data corresponding to the current duty cycle of the determined PWM dimming signal.

In this way, when the backlight brightness data processing device acquires the backlight brightness data, it is necessary to send a read command to the photosensor device at a set time after determining that the received PWM dimming signal includes a preset jump, instead of randomly The sending is such that the sending of the read command has a time basis, that is, the time for the backlight brightness data processing device to send the read command is more stable, so that the time for the optical sensor device to receive the read command is more stable, and the backlight of the light sensor device is obtained. The brightness data is more stable, which makes the determined PWM dimming signal more accurate in the current brightness data corresponding to the current duty cycle, and improves the stability of the backlight brightness of the display device.

As shown in FIG. 5, an embodiment of the present disclosure provides a method for processing backlight brightness data, including:

Step 401: Acquire first to xth backlight brightness data.

The obtaining the qth backlight luminance data includes: receiving a PWM dimming signal sent by the PWM controller; determining whether the received PWM dimming signal includes a preset transition; if included, setting the preset transition The read command is sent to the photosensor device at a fixed time; and the backlight luminance data acquired by the photosensor device according to the read command is received. The value of q is any value from 1 to x, and x is an integer greater than or equal to 1.

Reference may be made to step 301, and details are not described herein again. It can be understood that, as described above, for the x backlight luminance data, the step of receiving the PWM dimming signal sent by the PWM controller may be performed only once.

设定的。若x＝20，即背光亮度数据处理装置需获取20个背光亮度数据，此时，背光亮度数据处理装置可以通过下述步骤来获取20个背光亮度数据。在获取第1个背光亮度数据时，背光亮度数据处理装置接收PWM控制器发送的PWM调光信号，此时背光亮度数据处理装置需要先判断PWM调光信号是否为一个完整周期的PWM调光信号，即为检测PWM调光信号是否有上升沿和下降沿，若PWM调光信号有上升沿和下降沿，则可以确定PWM调光信号为一个完整周期的PWM调光信号。由于背光亮度数据处理装置并未接收到背光亮度数据，即为已经接收的背光亮度数据为0，则通过公式

可以确定出读取发送指令时间为0，即为背光亮度数据处理装置确定PWM调光信号为一个完整周期的PWM调光信号后，立即向光传感器件发送读取指令。光传感器件接收到读取指令后，可以读取背光模组提供的背光源的亮度数据，即为读取背光亮度数据，并将读取的背光亮度数据发送至背光亮度数据处理装置。背光亮度数据处理装置接收光传感器件获取的背光亮度数据。此时，背光亮度数据处理装置可以获取到第1个背光亮度数据。背光亮度数据处理装置在获取到第1个背光亮度数据后，可以更新已经接收的背光亮度数据的个数，即为将已经接收的背光亮度数据的个数更新为1，并将更新的已经接收的背光亮度数据的个数1与需获取的背光亮度数据个数20进行比较。判断出已经接收的背光亮度数据的个数未到需获取的背光亮度数据个数20，则背光亮度数据处理装置继续获取背光亮度数据。Exemplarily, it is assumed that the sending time of the set read command corresponding to each backlight brightness data is different, and the read command sending time is based on the number of received backlight brightness data, using a formula

Set. If x=20, that is, the backlight brightness data processing device needs to acquire 20 backlight brightness data, at this time, the backlight brightness data processing device can acquire 20 backlight brightness data by the following steps. When acquiring the first backlight brightness data, the backlight brightness data processing device receives the PWM dimming signal sent by the PWM controller, and the backlight brightness data processing device needs to first determine whether the PWM dimming signal is a full cycle PWM dimming signal. To detect whether the PWM dimming signal has rising and falling edges, if the PWM dimming signal has rising and falling edges, it can be determined that the PWM dimming signal is a full-cycle PWM dimming signal. Since the backlight luminance data processing device does not receive the backlight luminance data, that is, the received backlight luminance data is 0, the formula is adopted.

It can be determined that the read send command time is 0, that is, after the backlight brightness data processing device determines that the PWM dimming signal is a full cycle PWM dimming signal, the read command is sent to the photosensor device immediately. After receiving the read command, the optical sensor device can read the brightness data of the backlight provided by the backlight module, that is, read the backlight brightness data, and send the read backlight brightness data to the backlight brightness data processing device. The backlight brightness data processing device receives backlight brightness data acquired by the light sensor device. At this time, the backlight luminance data processing device can acquire the first backlight luminance data. After acquiring the first backlight brightness data, the backlight brightness data processing device may update the number of received backlight brightness data, that is, update the number of received backlight brightness data to 1, and update the received data. The number 1 of backlight luminance data is compared with the number 20 of backlight luminance data to be acquired. It is determined that the number of received backlight luminance data is less than the number of backlight luminance data 20 to be acquired, and the backlight luminance data processing device continues to acquire backlight luminance data.

可以确定出读取发送指令时间为

并在确定出PWM调光信号有上升沿和下降沿后，在间隔时间

后向光传感器件发送读取指令，即为等待时间

后向光传感器件发送读取指令。接收光传感器件根据上述读取指令获取的背光亮度数据。此时，背光亮度数据处理装置可以获取到第2个背光亮度数据。背光亮度数据处理装置在获取到第2个背光亮度数据后，可以更新已经接收的背光亮度数据的个数，即为将已经接收的背光亮度数据的个数更新为2，并将更新的已经接收的背光亮度数据的个数2与需获取的背光亮度数据个数20进行比较，判断出已经接收的背光亮度数据的个数2未达到预设个数20，背光亮度数据处理装置继续获取背光亮度数据，直至获取到20个背光亮度数据。For obtaining the 2-20th backlight luminance data, according to an implementation manner, the backlight luminance data processing device can continue to receive the PWM dimming signal sent by the PWM controller, and continue to determine whether the PWM dimming signal is a full cycle PWM modulation. The optical signal is to detect whether the PWM dimming signal has rising and falling edges. If the PWM dimming signal has rising and falling edges, it can be determined that the PWM dimming signal is a full-cycle PWM dimming signal. The backlight brightness data processing device can pass the formula according to the number of backlight luminance data that has been received by one.

It can be determined that the read send instruction time is

And after determining that the PWM dimming signal has rising and falling edges, at intervals

Sending a read command to the rear light sensor device, that is, waiting time

The read command is sent to the rear light sensor device. The backlight luminance data acquired by the light sensor device according to the above read command is received. At this time, the backlight luminance data processing device can acquire the second backlight luminance data. After acquiring the second backlight luminance data, the backlight brightness data processing device may update the number of received backlight luminance data, that is, update the number of received backlight luminance data to 2, and update the received data. The number 2 of the backlight luminance data is compared with the number 20 of the backlight luminance data to be acquired, and it is determined that the number 2 of the received backlight luminance data does not reach the preset number of 20, and the backlight luminance data processing device continues to acquire the backlight luminance. Data until 20 backlight brightness data is acquired.

向光传感器件发送读取指令并采样第2-20个背光亮度数据。For obtaining the 2-20th backlight luminance data, according to another implementation manner, the backlight luminance data processing apparatus uses the preset transition time detected when acquiring the first backlight luminance data as the reference time, and sequentially intervals.

A read command is sent to the photosensor device and the 2-20th backlight luminance data is sampled.

Step 402: Determine, according to the x backlight luminance data, current luminance data corresponding to the PWM dimming signal at the current duty ratio.

Reference may be made to step 302 above, and details are not described herein again.

As described in the above example, after the backlight luminance data processing device acquires 20 backlight luminance data, the 20 backlight luminance data can be sorted according to the numerical value from the largest to the smallest, and the first two backlight luminance data are selected, that is, from 20 In the backlight brightness data, the values of the selected two backlight brightness data are not less than the values of the other 18 backlight brightness data. The selected two backlight luminance data are averaged, and the calculated average value is used as the first first luminance data. It is determined whether the number of the first brightness data that has been acquired reaches a preset number, and the preset number is 10, and the number of the first brightness data obtained is 1 and the preset number 10 is not reached. It is necessary to continue to acquire the first brightness data. At this time, the backlight brightness data processing device needs to re-execute the above step 401, re-acquire 20 backlight brightness data, and then obtain the second first brightness data according to the re-acquired 20 backlight brightness data, according to the above method until 10 pieces are acquired. First brightness data. After the 10 first brightness data are acquired, an average value of the 10 first brightness data may be calculated, and the average value is used as the current brightness data corresponding to the PWM dimming signal at the current duty ratio.

Step 403: Determine whether the current brightness data is equal to the target brightness data.

When the display device is shipped from the factory, the brightness of the display component is preset, so that the brightness data of the backlight provided by the backlight module is also preset as the target brightness data. In order to stabilize the brightness of the display component of the display device at a preset brightness, the brightness data of the backlight provided by the backlight module is required to be the target brightness data. After calculating the current luminance data corresponding to the PWM dimming signal at the current duty ratio, the backlight luminance data processing device may compare the current luminance data with the target luminance data to determine whether the current luminance data is equal to the target luminance data.

Further, when it is determined that the current brightness data is equal to the target brightness data, it indicates that the brightness of the backlight provided by the current backlight module is stable, and it is not necessary to adjust the duty ratio of the PWM dimming signal, and the following steps are not performed. When it is determined that the current brightness data is not equal to the target brightness data, it indicates that the brightness of the backlight provided by the current backlight module is unstable, and the duty ratio of the PWM dimming signal needs to be adjusted, and the following steps are performed.

As described in the above example, after the backlight luminance data processing device calculates the current luminance data, the current luminance data is compared with the target luminance data, and if the current luminance data and the target luminance data are not equal, it is required to adjust the current occupation of the PWM dimming signal. Empty ratio, perform the following steps.

It should be noted that the target brightness data is acquired in advance. The specific acquisition process is: adjusting the brightness of the display component of the display device to B0 by adjusting the duty ratio of the PWM dimming signal with the help of the external brightness detecting device before the display device leaves the factory. The backlight brightness data processing device determines the brightness data corresponding to the current duty ratio of the PWM dimming signal by using the above steps 401-402, that is, determining the brightness data corresponding to the brightness of the display component of the display device adjusted to B0, and determining The brightness data is the target brightness data.

Step 404: If the current brightness data and the target brightness data are not equal, adjust the current duty ratio of the PWM dimming signal according to the current brightness data and the target brightness data.

When the backlight brightness data processing device determines that the current brightness data is not equal to the target brightness data, it indicates that the brightness of the backlight provided by the current backlight module is not the preset brightness, and the brightness of the backlight provided by the backlight module needs to be adjusted. At this time, the backlight brightness data processing device can adjust the current duty ratio of the PWM dimming signal according to the relationship between the current brightness data and the target brightness data.

That is, if the current brightness data is not equal to the target brightness data, adjusting the current duty ratio of the PWM dimming signal according to the current brightness data and the target brightness data includes:

If the current luminance data is less than the target luminance data, the duty cycle of the PWM dimming signal is increased.

If the current luminance data is greater than the target luminance data, the duty cycle of the PWM dimming signal is reduced.

In other words, when the backlight brightness data processing device determines that the current brightness data is smaller than the target brightness data, it indicates that the brightness of the backlight provided by the current backlight module is too dark, and the brightness of the backlight provided by the backlight module needs to be improved. Increasing the current duty cycle of the PWM dimming signal to increase the power of the backlight module, thereby increasing the brightness of the backlight provided by the backlight module.

When it is determined that the current brightness data is greater than the target brightness data, it indicates that the brightness of the backlight provided by the current backlight module is too bright, and the brightness of the backlight provided by the backlight module needs to be reduced. At this time, the current PWM dimming signal can be reduced. The duty ratio is used to reduce the time for the backlight module to be energized, thereby reducing the brightness of the backlight provided by the backlight module.

Further, when the backlight brightness data processing device performs the duty ratio adjustment of the PWM dimming signal, Adjusting the duty ratio of the PWM dimming signal in a small step size to prevent the backlight module from changing the brightness of the backlight according to the duty ratio of the adjusted PWM dimming signal too fast, causing the display device to be uncomfortable when viewed by the user. .

As described in the above example, assuming that the backlight brightness data processing device determines that the current brightness data is smaller than the target brightness data, the backlight brightness data processing device can increase the current duty ratio of the PWM dimming signal, so as to increase the time for the backlight module to be energized, thereby improving The brightness of the backlight provided by the backlight module.

It should be noted that, when the display device is just turned on, due to the influence of temperature, etc., when the duty ratio of the PWM dimming signal output by the PWM controller is a preset duty ratio, the brightness data of the backlight provided by the backlight module is smaller than Target brightness data, at this time, the duty ratio of the PWM dimming signal can be increased by the above steps 401-404, so that the brightness of the display device is stabilized to a preset brightness as soon as possible.

It should be noted that if the display device is used for a long time, the backlight module is aging, and the brightness of the provided backlight is not the preset brightness. The duty ratio of the PWM dimming signal can be adjusted through steps 401-404 to make the display device The brightness is stabilized at the preset brightness.

In this way, when the backlight brightness data processing device obtains the backlight brightness data, it is determined that the received PWM dimming signal includes a preset jump, and is sent to the photosensor device at a set time after the preset jump. Read command, instead of random transmission, when the set time is the same, that is, the read command transmission time for sending the read command to the photosensor device is fixed time each time, the backlight brightness data read by the photo sensor device at a time It is the backlight brightness data in the same period of the dimming period, so that the current PWM data corresponding to the determined PWM dimming signal is more accurate at the current duty ratio, and the stability of the backlight brightness of the display device is improved.

The set time may be determined according to the number of backlight luminance data that has been received, each time the set time corresponding to the acquired backlight luminance data is different. That is, the light sensor device reads the backlight brightness data in different time periods, selects the first n backlight brightness data according to the numerical value from the largest to the smallest in the x backlight brightness data, and then obtains the first according to the n backlight brightness data. The brightness data is obtained, and the first brightness data of the preset number is obtained by using the foregoing method, and the current brightness data corresponding to the PWM dimming signal at the current duty ratio is obtained according to the preset number of first brightness data. Since the difference between the n backlight luminance data for calculating any one of the first luminance data is small, the first luminance data is more accurate, thereby making the determined PWM dimming signal more current luminance data corresponding to the current duty ratio. Accurately, when the current brightness data and the target brightness data are not equal, the accuracy of adjusting the current duty ratio of the PWM dimming signal is improved, and the brightness of the backlight module is adjusted by adjusting the current duty ratio of the PWM dimming signal in real time. Stable purpose.

With regard to the apparatus in the above embodiments, the specific manner in which the respective modules perform the operations has been described in detail in the embodiment relating to the method, and will not be explained in detail herein.

FIG. 6 is a schematic structural diagram of an apparatus for acquiring backlight luminance data according to an embodiment of the present disclosure. As shown in FIG. 6, the apparatus 500 may include: at least one processor 501, and a memory. 502. Peripheral interface 503, input/output subsystem (I/O subsystem) 504, power line 505 and communication line 506.

Memory 502 can include an operating system 512 and an acquisition backlight brightness routine 522. For example, the memory 502 may include a high-speed random access memory, a magnetic disk, a static random access memory (SRAM), a dynamic random access memory (DRAM), a read only memory (ROM), a flash memory, or a non-volatile memory. Volatile memory. The memory 502 can store program code for the operating system 512 and the acquisition backlight brightness routine 522, that is, can include software modules, instruction set architectures, or a variety of data required for the actions of the device 500 that acquires backlight brightness. . At this time, access of the other controllers such as the processor 501 or the peripheral device interface 503 and the memory 502 can be controlled by the processor 501.

The peripheral device interface 503 can combine the input and/or output peripherals of the device 500 that acquires backlight luminance data with the processor 501 and the memory 502. Also, input/output subsystem 504 can combine a variety of input/output peripherals with peripheral interface 503.

Power line 505 can supply power to all or part of the circuit components of the terminal device. For example, power line 505 can include more than one power source such as a power management system, battery or alternating current (AC), charging system, power failure detection circuit, power converter or inverter, power status tag Or any other circuit component used for power generation, management, and distribution.

Communication line 506 can communicate with other hosts using at least one interface.

The processor 501 can perform various functions of the device 500 for acquiring backlight luminance data and process the data by executing a software module or an instruction set architecture stored in the memory 502. That is, the processor 501 can be configured to process commands of a computer program by performing basic arithmetic, logic, and input/output calculations of a computer system.

The processor 501 is configured to perform the method of acquiring backlight luminance data in the above embodiment.

When the device 500 for acquiring backlight luminance data is configured to acquire backlight luminance data, it is required to send a read command to the photosensor device at a set time after determining that the received PWM dimming signal includes a preset hopping. It is not randomly sent, so that the sending of the read command has a time basis, that is, the time for transmitting the read command for the device for acquiring the backlight brightness data is more stable, so that the time for the optical sensor device to receive the read command is more stable, and the optical sensor device is further stabilized. The acquired backlight brightness data is more stable, thereby improving the stability of the backlight brightness of the display device.

FIG. 7 is a schematic structural diagram of a backlight luminance data processing apparatus according to an embodiment of the present disclosure. As shown in FIG. 7, the apparatus 600 may include: at least one processor 601 and a memory 602. A peripheral interface 603, an input/output subsystem (I/O subsystem) 604, a power line 605, and a communication line 606.

Memory 602 can include an operating system 612 and backlight brightness data processing routine 622. For example, the memory 602 may include a high-speed random access memory, a magnetic disk, a static random access memory (SRAM), a dynamic random access memory (DRAM), a read only memory (ROM), a flash memory, or a non-volatile memory. Volatile Save. The memory 602 can store program codes for the operating system 612 and the backlight brightness data processing routine 622, that is, can include software modules, instruction set architectures, or the like required for the actions of the backlight brightness data processing device 600. data. At this time, access of the other controllers such as the processor 601 or the peripheral device interface 603 and the memory 602 can be controlled by the processor 601.

Peripheral device interface 603 can combine the input and/or output peripherals of backlight brightness data processing device 600 with processor 601 and memory 602. Also, input/output subsystem 604 can combine a variety of input/output peripherals with peripheral interface 603.

Power line 605 can supply power to all or part of the circuit components of the terminal device. For example, power line 605 can include more than one power source such as a power management system, battery or alternating current (AC), a charging system, a power failure detection circuit, a power converter or inverter, and a power status flag. Or any other circuit component used for power generation, management, and distribution.

Communication line 606 can communicate with other hosts using at least one interface.

The processor 601 can perform various functions of the backlight luminance data processing device 600 and process the data by executing a software module or an instruction set architecture stored in the memory 602. That is, the processor 601 can be configured to process commands of a computer program by performing basic arithmetic, logic, and input/output calculations of the computer system.

The processor 601 is configured to perform the backlight luminance data processing method in the above embodiment.

When the backlight brightness data processing device configured as described above obtains the backlight brightness data, it is determined that the received PWM dimming signal includes a preset jump, and is sent to the photosensor device at a set time after the preset jump. The read command is not sent randomly, so that the current PWM data corresponding to the determined PWM dimming signal is more accurate at the current duty ratio, which improves the stability of the backlight brightness of the display device.

In addition, FIG. 8 is a block diagram of a liquid crystal display device 700 according to an exemplary embodiment. As shown in FIG. 8 , an embodiment of the present disclosure provides a liquid crystal display device 700. The liquid crystal display device 700 includes a display component 701, a backlight module 702 that provides a backlight for the display component 701, a backlight driving device 703, and PWM control. The device 704, the photosensor device 705, the processor 706 and the memory 707.

The backlight module 702 is connected to the backlight driving device 703. The PWM control device 704 is connected to the backlight driving device 703. The photo sensor device 705 is disposed at the backlight module 702 and is connected to the processor 706. Processor 706 is also coupled to PWM control device 704 and memory 707.

Memory 707 can include an operating system 712 and processing routine 722. For example, the memory 707 may include a high-speed random access memory, a magnetic disk, a static random access memory (SRAM), a dynamic random access memory (DRAM), a read only memory (ROM), a flash memory, or a non-volatile memory. Volatile memory. Memory 707 can store program code for operating system 712 and processing routine 722, that is, can include software modules, instruction set architectures, or a variety of data required for the actions of liquid crystal display device 700. At this point, access by processor 706 or other components to memory 707 can be controlled by processor 706.

The processor 706 can perform various functions of the liquid crystal display device 700 and process data by executing a software module or an instruction set architecture stored in the memory 707. That is, the processor 706 can be configured to process commands for a computer program by performing basic arithmetic, logic, and input/output calculations of the computer system.

The processor 706 is configured to perform any of the processing methods of the above embodiments.

In the above liquid crystal display device 700, when the backlight luminance data is acquired, it is determined that the received PWM dimming signal includes a preset jump, and is sent to the optical sensor device at a set time after the preset jump. The instruction, rather than random transmission, further makes the determined PWM dimming signal more accurate at the current duty ratio corresponding to the current luminance data, thereby improving the stability of the backlight brightness of the display device.

For the convenience of description, the above devices are described separately by function into various units. Of course, the functions of the various units may be implemented in one or more software and/or hardware in the practice of the present disclosure.

Other embodiments of the present disclosure will be apparent to those skilled in the <RTIgt; The present application is intended to cover any variations, uses, or adaptations of the present disclosure, which are in accordance with the general principles of the disclosure and include common general knowledge or common technical means in the art that are not disclosed in the present disclosure. . The specification and examples are to be regarded as illustrative only,

It is to be understood that the present invention is not limited to the precise structures shown and described in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the disclosure is to be limited only by the appended claims.

Claims (17)

A method for obtaining backlight brightness data, which is applied to a liquid crystal display device having a built-in photosensor device, the method comprising: Receiving a PWM dimming signal sent by a pulse width modulation PWM controller; Determining whether the received PWM dimming signal includes a preset hopping; If the PWM dimming signal includes the preset hopping, sending a read command to the photosensor device at a set time after the preset hopping; Receiving backlight brightness data acquired by the light sensor device according to the read command. The method according to claim 1, wherein the preset transition comprises: a rising edge transition of the signal and/or a falling edge transition of the signal; Determining whether the received PWM dimming signal includes a preset hopping includes: Detecting whether the received PWM dimming signal includes a rising edge transition of the signal and/or a falling edge transition of the signal. A method for processing backlight brightness data, comprising: Acquiring at least one backlight brightness data, wherein obtaining any one of the backlight brightness data comprises: acquiring the backlight brightness data by the method for acquiring backlight brightness data according to claim 1 or 2; Determining, according to the at least one backlight luminance data, current luminance data corresponding to the PWM dimming signal at the current duty ratio. The method according to claim 3, wherein the determining, according to the at least one backlight luminance data, the current luminance data corresponding to the PWM dimming signal at the current duty ratio comprises: Acquiring first brightness data according to the at least one backlight brightness data; Determining whether the number of acquired first brightness data reaches a preset number; If the number of the obtained first brightness data does not reach the preset number, the step of acquiring at least one backlight brightness data is performed again; And if the number of the acquired first brightness data reaches a preset number, determining, according to the acquired first brightness data, current brightness data corresponding to the PWM dimming signal at the current duty ratio. The method according to claim 4, wherein the acquiring the first brightness data according to the at least one backlight brightness data comprises: In the at least one backlight brightness data, n backlight brightness data are selected; wherein, the value of any one of the n backlight brightness data is not less than any one of the k backlight brightness data a value of the backlight brightness data of the at least one backlight brightness data other than the n backlight brightness data; Calculating an average of the n backlight luminance data to obtain the first luminance data. The method according to claim 4 or 5, wherein the determining, according to the acquired first luminance data, the current luminance data corresponding to the PWM dimming signal at the current duty ratio comprises: Calculating an average value of the acquired first brightness data to obtain current brightness data corresponding to the PWM dimming signal at a current duty ratio. A method according to any one of claims 3 to 6, wherein The set time is based on the number of received backlight luminance data, using a formula

Determining; wherein, T _PWM is a period of the PWM dimming signal, x is the number of the at least one backlight luminance data, and i is the number of received backlight luminance data. A method according to any one of claims 3 to 6, wherein The set time is based on the number of backlight luminance data that has been received, using a formula

Determining; wherein T _PWM is the period of the PWM dimming signal, x is the number of the at least one backlight luminance data, i is the number of received backlight luminance data, and ΔT _c indicates that the PWM controller provides the PWM signal and The backlight module provides a delay time between backlights. The method according to any one of claims 3 to 8, wherein the preset transition comprises: a rising edge transition of the signal and/or a falling edge transition of the signal. A liquid crystal display device, comprising: a display component, a backlight module providing a backlight for the display component, a backlight driving device, a pulse width modulation PWM controller, a photo sensor device, a processor, and a storage device Memory of program code; The backlight module is connected to the backlight driving device; The PWM controller is connected to the backlight driving device; The photo sensor device is disposed at the backlight module and connected to the processor; The processor is coupled to the PWM controller and the memory for reading program code stored in the memory and for performing: Receiving a PWM dimming signal sent by the PWM controller; Determining whether the received PWM dimming signal includes a preset hopping; If the PWM dimming signal includes the preset hopping, sending a read command to the photosensor device at a set time after the preset hopping; Receiving backlight brightness data acquired by the light sensor device according to the read command. The liquid crystal display device according to claim 10, wherein the preset transition comprises: a rising edge transition of the signal and/or a falling edge transition of the signal; The processor is further configured to: detect whether the received PWM dimming signal includes a rising edge transition of the signal and/or a falling edge transition of the signal. The liquid crystal display device according to claim 10 or 11, wherein the processor is further configured to: Obtaining at least one of the backlight brightness data; Determining, according to the at least one backlight luminance data, current luminance data corresponding to the PWM dimming signal at a current duty ratio. The liquid crystal display device according to claim 12, wherein the processor is further configured to: Acquiring first brightness data according to the at least one backlight brightness data; Determining whether the number of acquired first brightness data reaches a preset number; If the number of the obtained first brightness data does not reach the preset number, the step of acquiring at least one backlight brightness data is performed again; And if the number of the acquired first brightness data reaches a preset number, determining, according to the acquired first brightness data, current brightness data corresponding to the PWM dimming signal at the current duty ratio. The liquid crystal display device according to claim 13, wherein the processor is further configured to: In the at least one backlight brightness data, n backlight brightness data are selected; wherein, the value of any one of the n backlight brightness data is not less than any one of the k backlight brightness data a value of the backlight brightness data of the at least one backlight brightness data other than the n backlight brightness data; Calculating an average of the n backlight luminance data to obtain the first luminance data. The liquid crystal display device according to claim 13 or 14, wherein the processor is further configured to: Calculating an average value of the acquired first brightness data to obtain current brightness data corresponding to the PWM dimming signal at a current duty ratio. A liquid crystal display device according to any one of claims 12 to 15, wherein The set time is based on the number of received backlight luminance data, using a formula

Determining; wherein, T _PWM is a period of the PWM dimming signal, x is the number of the at least one backlight luminance data, and i is the number of received backlight luminance data. A liquid crystal display device according to any one of claims 12 to 15, wherein The set time is based on the number of backlight luminance data that has been received, using a formula

Determining; wherein T _PWM is the period of the PWM dimming signal, x is the number of the at least one backlight luminance data, i is the number of received backlight luminance data, and ΔT _c indicates that the PWM controller provides the PWM signal and The backlight module provides a delay time between backlights.

Images