CN109697954B - Display device and brightness compensation method thereof - Google Patents

Abstract

The invention provides a display device, comprising a display substrate, the display substrate includes a plurality of light-emitting units, and also includes a plurality of photosensitive sensor groups and a plurality of temperature sensors; each photosensitive sensor group includes at least one photosensitive sensor; the photosensitive sensor and the light-emitting unit are one One-to-one correspondence; the temperature sensors are in one-to-one correspondence with the photosensitive sensor groups; the display device further includes: a calculation module for displaying the current frame, according to the electrical signals generated by each photosensitive sensor, the temperature detected by each temperature sensor, and the preset The corresponding relationship between the signals determines the light intensity actually received by each photosensitive sensor; the compensation module is used to obtain the actual brightness of each light-emitting unit according to the light intensity actually received by each photosensitive sensor; and according to the difference between the actual brightness and the standard brightness, Adjust the data voltage of n frames including the current frame. The invention also provides a brightness compensation method of a display device. The present invention can improve display quality.

Description

Display device and brightness compensation method thereof

technical field

The present invention relates to the field of display technology, in particular to a display device and a brightness compensation method for the display device.

Background technique

An urgent problem faced by a large-size organic electroluminescence (Organic Light-Emitting Device, OLED for short) display device is that the display quality is degraded and the display brightness is not uniform due to the aging of the light-emitting unit. The commonly used solutions at present cannot solve the problem of display uniformity very well.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a display device and a brightness compensation method thereof.

In order to achieve the above object, the present invention provides a display device, comprising a display substrate, the display substrate comprising a plurality of light emitting units, the display substrate further comprising a plurality of photosensitive sensor groups and a plurality of temperature sensors; each photosensitive sensor group includes at least a photosensitive sensor; the photosensitive sensor is in one-to-one correspondence with the light-emitting unit, and is used to generate a corresponding electrical signal according to the light intensity emitted by the corresponding light-emitting unit; the temperature sensor is in one-to-one correspondence with the photosensitive sensor group, used for Detecting the temperature of the photosensitive sensor group; the display device further includes:

The calculation module is used to determine the light intensity actually received by each photosensitive sensor according to the electrical signal generated by each photosensitive sensor, the temperature detected by each temperature sensor and the preset signal correspondence when the current frame is displayed; The signal corresponding relationship includes the corresponding relationship between the electrical signal generated by the photosensitive sensor and the received light intensity at different temperatures;

The compensation module is used to obtain the actual brightness of each light-emitting unit according to the light intensity actually received by each photosensitive sensor; The data voltage is adjusted; n is a preset positive integer.

Optionally, the light-emitting unit is disposed on a substrate, and the photosensor is disposed between the light-emitting unit and the substrate;

The temperature sensor is arranged between the photosensitive sensor and the substrate, or the temperature sensor is arranged in an interval between adjacent photosensitive sensor groups.

Optionally, the light-emitting unit includes: a first electrode, a second electrode, and a light-emitting functional layer disposed between the first electrode and the second electrode, and the first electrode is disposed on the light-emitting functional layer between the substrate and the substrate; the first electrode is made of metal;

至

之间，和/或，所述第一电极上设置有透光孔。The thickness of the first electrode is

to

Between, and/or, the first electrode is provided with a light-transmitting hole.

Optionally, the temperature sensor includes an odd-numbered phase inversion unit, wherein,

The input end of the first stage inversion unit is connected with the output end of the last stage inversion unit; in the second stage to the last stage, the input end of each stage inversion unit is connected with the output end of the previous stage inversion unit , the output end of the last stage of the inverter unit is used as the output end of the temperature sensor to output a voltage signal that oscillates between high and low levels, and the oscillation frequency of the voltage signal corresponds to the temperature of the area where the temperature sensor is located .

Optionally, the inverting unit includes: a first N-type transistor and a second N-type transistor;

The gate and first pole of the first N-type transistor are both connected to the high-level signal terminal, and the second pole of the first N-type transistor is connected to the output terminal of the inverting unit;

The gate of the second N-type transistor is connected to the input terminal of the inverting unit, the first pole of the second N-type transistor is connected to the output terminal of the inverting unit, and the second N-type transistor is connected to the output terminal of the inverting unit. The second pole of is connected to the low-level input terminal.

Optionally, the display device further includes:

a light intensity level determination module, configured to determine the light intensity level of each sub-pixel according to the standard brightness of each light-emitting unit in the current frame;

A parameter adjustment module, configured to adjust the parameters of the photosensitive sensor according to the light intensity level of each light-emitting unit and the corresponding relationship between the preset light intensity level and the parameters of the photosensitive sensor; the parameters of the photosensitive sensor include the photocurrent integral time and signal gain.

Optionally, n is 1.

Correspondingly, the present invention also provides a brightness compensation method for a display device, the display device includes a display substrate, the display substrate includes a plurality of light-emitting units, a plurality of photosensitive sensor groups and a plurality of temperature sensors; each photosensitive sensor group includes at least one photosensitive sensor; the photosensitive sensor corresponds to the light-emitting unit one-to-one, and is used to generate a corresponding electrical signal according to the intensity of light emitted by the corresponding light-emitting unit; the temperature sensor corresponds to the photosensitive sensor group one-to-one, using for detecting the temperature of the photosensitive sensor group; the brightness compensation method includes:

When the current frame is displayed, the light intensity actually received by each photosensitive sensor is determined according to the electrical signal generated by each photosensitive sensor, the temperature detected by each temperature sensor, and the preset signal correspondence; wherein, the signal correspondence includes: Correspondence between the electrical signal generated by the photosensitive sensor and the received light intensity at different temperatures;

Obtain the actual brightness of each light-emitting unit according to the light intensity actually received by each photosensitive sensor;

According to the difference between the actual brightness of each light-emitting unit and the standard brightness, the data voltages of n frames including the current frame are adjusted; n is a preset positive integer.

Optionally, before the step of determining the light intensity actually received by each photosensitive sensor according to the electrical signal generated by each photosensitive sensor, the temperature detected by each temperature sensor and the preset signal correspondence, the method further includes:

Determine the light intensity level of each light-emitting unit according to the standard brightness of each light-emitting unit in the current frame;

The parameters of the photosensitive sensor are adjusted according to the light intensity level of each light-emitting unit and the preset corresponding relationship between the light intensity level and the parameters of the photosensitive sensor; the parameters of the photosensitive sensor include photocurrent integration time and signal gain.

Optionally, n is 1.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached image:

FIG. 1 is a schematic structural diagram of a module of a display device provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of the first structure of the display substrate 10 provided in the embodiment of the present invention;

FIG. 3 is a schematic diagram of a second structure of the display substrate 10 provided in the embodiment of the present invention;

4 is a graph showing the relationship between the electrical signal generated by the photosensitive sensor and the received light intensity at different temperatures;

5 is a schematic structural diagram of a module of a temperature sensor in an embodiment of the present invention;

6 is a schematic diagram of a specific structure of a temperature sensor in an embodiment of the present invention;

7 is a schematic structural diagram of a photosensitive sensor in an embodiment of the present invention;

FIG. 8 is one of the flowcharts of a brightness compensation method of a display device provided by an embodiment of the present invention;

9 is the second flow chart of the luminance compensation method of the present invention;

FIG. 10 is a timing diagram of the luminance compensation process.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

Usually, the OLED display substrate works in a state of high contrast and high brightness for a long time, and the OLED light-emitting unit will decay, and the degree of decay of different OLED light-emitting units is not necessarily the same. Therefore, the brightness of the OLED display substrate will be uneven. Therefore, it is necessary to compensate the brightness of the OLED light-emitting unit. At present, the commonly used compensation method is to use the external electrical compensation of the sub-pixel circuit, but the compensation effect of this method is poor.

In order to improve the brightness compensation effect of the display device, Embodiment 1 of the present invention provides a display device. FIG. 1 is a schematic diagram of a module structure of the display device provided by the embodiment of the present invention. As shown in FIG. 1 , the display device includes: a display substrate 10. The calculation module 20 and the compensation module 30.

FIG. 2 is a schematic diagram of a first structure of the display substrate 10 provided in an embodiment of the present invention, and FIG. 3 is a schematic diagram of a second structure of the display substrate 10 provided in an embodiment of the present invention. As shown in FIG. 2 and FIG. 3 , the display substrate 10 is divided into a plurality of pixels, each pixel includes a plurality of sub-pixels P, and each sub-pixel P is provided with a light-emitting unit 12 . The light-emitting unit 12 is an organic electroluminescent unit; the light-emitting unit 12 in each pixel is a red (R) light-emitting unit, a green (R) light-emitting unit and a blue (B) light-emitting unit, respectively. The display substrate 10 further includes: a plurality of photosensitive sensor groups 13 and a plurality of temperature sensors 14; each photosensitive sensor group 13 includes at least one photosensitive sensor 131; The light intensity emitted by the light emitting unit 12 generates a corresponding electrical signal. The temperature sensors 14 are in one-to-one correspondence with the photosensitive sensor groups 13 , and are used to detect the temperature of the corresponding photosensitive sensor groups 13 .

2 and 3 illustrate the case where the photosensitive sensor group 13 includes three photosensitive sensors; of course, the photosensitive sensor group 13 may also include only one photosensitive sensor 131 . The temperature sensors 14 are in one-to-one correspondence.

The calculation module 20 is used to determine the light intensity actually received by each photosensitive sensor 131 according to the electrical signal generated by each photosensitive sensor 131 , the temperature detected by each temperature sensor 14 and the preset signal correspondence when displaying the current frame. The signal correspondence includes the correspondence between the electrical signals generated by the photosensitive sensor 131 and the received light intensity at different temperatures. At different temperatures, the relationship curve between the electrical signal generated by the photosensitive sensor 131 and the received light intensity is shown in FIG. 4 . FIG. 4 only shows the corresponding relationship between the electrical signals generated by the photosensitive sensor and the received light intensity at four temperatures.

The compensation module 30 is used to obtain the actual brightness of each light-emitting unit 12 according to the light intensity actually received by each photosensitive sensor, and according to the difference between the actual brightness of each light-emitting unit 12 and the standard brightness, for n including the current frame. The data voltage of the frame picture is adjusted to compensate the brightness of the display device, so that in each frame picture, the actual brightness of the light-emitting unit 12 reaches the standard brightness. The standard brightness is the brightness that the light-emitting unit 12 should achieve theoretically when a certain frame of picture is displayed. Among them, n is a preset positive integer.

It should be understood that when n is 1, the compensation module 30 adjusts the data voltage of the current frame; and when n is greater than 1, the compensation module adjusts the data voltage of the current frame and the next n-1 frames. .

In this embodiment, n is 1. That is, when displaying each frame of picture, the actual brightness of each light-emitting unit 12 is detected, and the data voltage provided to each light-emitting unit 12 in the current frame of display picture is adjusted according to the actual brightness of the light-emitting unit 12 .

Under normal circumstances, the temperature of the display substrate 10 will increase after a long time of operation, and the temperature increase will affect the measurement accuracy of the photosensitive sensor. In this embodiment, the temperature sensor 14 is used to detect the temperature of the photosensitive sensor 131, and the temperature of the photosensitive sensor 131 and the electrical signal generated by the photosensitive sensor 131 are combined to determine the luminous intensity of the light-emitting unit 12, and then determine the actual light-emitting unit 12. In this way, the accuracy of the brightness detection of the light-emitting unit 12 can be improved. Moreover, every time the brightness of each light-emitting unit 12 in the current frame is acquired, the compensation module 30 adjusts the data voltage of the current frame to make the brightness of the current frame more uniform, thereby realizing dynamic compensation. Since the detection result of the photosensitive sensor 131 in this embodiment is more accurate, the detection result of the photosensitive sensor 131 can better compensate the brightness of the display device, thereby improving the display quality of the display device.

Optionally, as shown in FIG. 2 and FIG. 3 , the light-emitting unit 12 is disposed on the substrate 11 , and the light-emitting unit 12 includes: a first electrode 121 , a second electrode 122 , and a first electrode 121 and a second electrode 122 disposed between the first electrode 121 and the second electrode 122 . The light-emitting functional layer 123 in between. The first electrode 121 is disposed between the light-emitting functional layer 123 and the substrate 11 ; the photosensor 131 is disposed between the first electrode 121 and the substrate 11 .

The first electrode 121 may be the cathode of the light-emitting unit 12, and may be specifically made of a metal material such as aluminum. The second electrode 122 may be the anode of the light emitting unit 12, and may be specifically made of a transparent conductive material such as indium tin oxide (ITO).

至

之间；和/或，在第一电极121上设置透光孔。In order to ensure that the light-sensitive sensor 131 can detect the light-emitting intensity of the light-emitting unit 12, optionally, the thickness of the first electrode 121 is set to

to

and/or, a light-transmitting hole is provided on the first electrode 121 .

此时，第一电极121的透过率可以达到10％，此部分的光线已经足够光敏传感器进行检测；同时大部分光线被反射，所以显示的光效并不会受到很大影响。这种情况下，发光单元12的实际亮度可以根据光敏检测器131接收到的光线强度和第一电极121的透过率来确定。For example, the first electrode 121 is made of aluminum, and the thickness of the first electrode 121 is set to

At this time, the transmittance of the first electrode 121 can reach 10%, and the light in this part is enough for the photosensitive sensor to detect; at the same time, most of the light is reflected, so the displayed light effect will not be greatly affected. In this case, the actual brightness of the light-emitting unit 12 can be determined according to the light intensity received by the photosensitive detector 131 and the transmittance of the first electrode 121 .

Alternatively, as shown in FIG. 2 , the temperature sensor 14 may be disposed between the photosensitive sensor 131 and the substrate 11 . Alternatively, as shown in FIG. 3 , the temperature sensor 14 is arranged in the interval between the adjacent photosensitive sensor groups 13 ; at this time, the temperature sensor 14 can also reduce the light interference of the adjacent light-emitting units 12 and ensure the detection of the photosensitive sensor 131 precision.

FIG. 5 is a schematic structural diagram of a temperature sensor in an embodiment of the present invention. As shown in FIG. 5 , the temperature sensor 14 includes an odd-numbered stage inverting unit 141 . Among them, the input terminal of the first stage inversion unit 141 is connected to the output terminal of the last stage inversion unit 141; in the second stage to the last stage, the input terminal of each stage of the inversion unit 141 is inverted with the previous stage The output end of the unit 141 is connected, and the output end Vout of the last stage inverting unit 141 is used as the output end of the sensor 14 to output a voltage signal oscillating between high and low levels, and the oscillation frequency of the voltage signal is the same as the temperature sensor 14. corresponding to the temperature of the area.

FIG. 5 and FIG. 6 take the temperature sensor 14 including the three-stage inversion unit 141 as an example for illustration. Of course, the number of stages of the inversion unit 141 may be other numbers.

As shown in FIG. 6 , the inverting unit 141 specifically includes a first N-type transistor T1 and a second N-type transistor T2. The gate and first pole of the first N-type transistor T1 are both connected to the high-level input terminal VDD (for example, a voltage terminal of 10V), and the second pole of the first N-type transistor T1 is connected to the output terminal of the inverting unit 141 . The gate of the second N-type transistor T2 is connected to the input terminal of the inverting unit 141, the first pole of the second N-type transistor T2 is connected to the output terminal of the inverting unit 141, and the second pole of the second N-type transistor T2 is connected to the output terminal of the inverting unit 141. The low-level input terminal VSS (eg, the voltage terminal of -8V) is connected. The gate of the second N-type transistor T2 in the first-stage inversion unit 141 serves as the input terminal Vin of the first-stage inversion unit 141 .

When the input terminal of the inverting unit 141 receives a high-level signal, the second N-type transistor T2 is turned on, so that the output terminal of the inverting unit 141 outputs a low-level signal; when the input terminal of the inverting unit 141 receives a low-level signal When the signal is at a low level, the second N-type transistor T2 is turned off, and the output terminal of the inverting unit 141 outputs a high level signal. When the temperature changes, the leakage current of the second N-type transistor T2 changes. The higher the temperature, the greater the leakage current. When the voltage of the first electrode of the second N-type transistor T2 decreases to the second N-type inverting unit 141 in the next stage When the threshold voltage of the transistor T2 is reached, the second N-type transistor T2 of the next stage is turned off, so that the inverting unit 141 of the next stage outputs a high-level signal; and so on, the inverting unit 141 of the last stage outputs a low-level signal, The low-level signal is input to the input terminal of the first-stage inverting unit, so that the last-stage inverting unit 141 outputs a high level, thereby causing the temperature sensor 14 to output an oscillating signal corresponding to the frequency and temperature. Moreover, the higher the temperature, the greater the leakage current and the faster the oscillation frequency of the voltage signal, so that the temperature can be determined according to the oscillation frequency.

Further, as shown in FIG. 1 , the display device further includes: a light intensity level determination module 40 and a parameter adjustment module 50 . The light intensity level determination module 40 is configured to determine the light intensity level of each light emitting unit 12 according to the standard brightness of each light emitting unit 12 in the current frame. The parameter adjustment module 40 is used to adjust the parameters of the photosensitive sensor 131 according to the light intensity level of each light-emitting unit 12 and the corresponding relationship between the preset light intensity level and the parameters of the photosensitive sensor 131; the parameters of the photosensitive sensor 131 include the photocurrent integral time and signal gain.

Optionally, the achievable intensity of the light emitted by the light-emitting unit 12 may be divided into three light intensity levels, high, medium, and low, and each level corresponds to a light intensity range. The light intensity level determination module 40 specifically determines the light intensity level that the light emitting unit 12 should reach according to the target brightness that the light emitting unit 12 should reach. The parameter adjustment module 50 adjusts the photocurrent integration time and signal gain of the photosensitive sensor 131 according to the light intensity level of the light emitting unit 12 . By configuring the parameters of the photosensitive sensor 131 , the photoelectric conversion accuracy of the photosensitive sensor 131 is improved.

As shown in FIG. 7 , the photosensor 131 may include a photodiode PIN, a reset transistor T11 , a follower transistor T12 , a gate transistor T13 and an operational amplifier OP. The anode of the photodiode PIN is connected to the low-level signal terminal VSS; the cathode is connected to the second pole of the reset transistor T11. The gate of the reset transistor T11 is connected to the reset terminal Reset, and the first electrode is connected to the high-level signal terminal Vdd. The gate of the follower transistor T12 is connected to the cathode of the photodiode PIN, and the first electrode is connected to the high-level signal terminal Vdd. The gate of the pass transistor T3 is connected to the scan terminal Scan, the first pole of the pass transistor T13 is connected to the second pole of the follower transistor T2, and the second pole of the pass transistor T13 is connected to the current source Is and the operational amplifier OP. Wherein, a column of photosensors 131 corresponding to the same column of sub-pixels may share the same operational amplifier OP and the same current source Is.

Each time the photosensitive sensor 131 performs light intensity detection, it can first control the reset transistor T11 to turn on, so as to reset the photodiode PIN; then, control the reset transistor T11 to turn off, and the photodiode PIN is illuminated to perform photocurrent integration. , when the integration reaches a certain time, the control gate transistor T13 is turned on, and the current source Is acts on the follower transistor T12, so that the voltage change of the photodiode PIN cathode is followed to the input end of the operational amplifier OP, so that the signal is transmitted through the operational amplifier OP. After amplification, it is provided to the calculation module for calculation. The photocurrent integration time of the photosensor 131 is the time from when the reset transistor T11 is turned off to when the gate transistor T13 is turned on; the signal gain of the photosensor 131 is the gain of the operational amplifier.

It should be noted that, the photocurrent integration time of the photosensitive sensor 131 should not exceed the duration of one frame.

In the present invention, the display device may further include a storage module for storing the above-mentioned signal correspondence. Wherein, each photosensor 131 may correspond to the same signal correspondence, and different photosensors 131 may correspond to different signal correspondences; the sub-pixels of the display substrate may also be divided into multiple groups, each group including multiple sub-pixels, the same group of sub-pixels The performance of the photosensors in the sub-pixels is considered to be the same. At this time, the photosensors in the same group of sub-pixels correspond to the same signal correspondence, and the photosensors 131 of different groups correspond to different signal correspondences.

Wherein, the signal correspondence relationship corresponding to each group of photosensors 131 can be set by the following steps:

Set multiple reference temperatures.

After that, at each reference temperature, the intensity of the light emitted by the group of light-emitting units 12 is controlled to reach a plurality of preset intensities in sequence, and the light-emitting units 12 corresponding to the group of light-emitting units 12 are obtained and the plurality of preset intensities generated by the photosensitive sensors 131 are obtained. One-to-one corresponding multiple reference electrical signals.

Then, for each reference temperature, a relationship between the electrical signal generated by the photosensitive sensor 131 and the received light intensity at the temperature is generated according to a plurality of reference electrical signals corresponding to a plurality of preset intensities at the reference temperature. The corresponding relationship between the electrical signals generated by the photosensitive sensor 131 and the received light intensity at different temperatures is obtained, that is, the signal corresponding relationship described above.

Correspondingly, the present invention also provides a brightness compensation method for a display device, the display device includes a display substrate, as shown in FIG. 2 and FIG. 3 , the display substrate includes a plurality of light-emitting units 12 , a plurality of photosensitive sensor groups 13 and a plurality of A temperature sensor 14. Each photosensitive sensor group 13 includes at least one photosensitive sensor 131 ; the photosensitive sensors 131 are in one-to-one correspondence with the light-emitting units 12 , and the photosensitive sensors 131 are used to generate corresponding electrical signals according to the light intensity emitted by the corresponding light-emitting units 12 . The temperature sensors 14 are in one-to-one correspondence with the photosensitive sensor groups 13 , and are used to detect the temperature of the corresponding photosensitive sensor groups 13 . FIG. 8 is a flowchart of a brightness compensation method of a display device provided by an embodiment of the present invention. As shown in FIG. 8 , the brightness compensation method includes:

S11. When displaying the current frame picture, determine the light intensity actually received by each photosensitive sensor according to the electrical signal generated by each photosensitive sensor, the temperature detected by each temperature sensor, and the preset signal correspondence; wherein, the signal corresponds to The relationship includes the corresponding relationship between the electrical signal generated by the photosensitive sensor and the received light intensity at different temperatures.

S12: Acquire the actual brightness of each light-emitting unit according to the light intensity actually received by each photosensitive sensor.

S13. According to the difference between the actual brightness of each light-emitting unit and the standard brightness, adjust the data voltage of n frames of pictures including the current frame; n is a preset positive integer.

FIG. 9 is the second flow chart of the brightness compensation method of the present invention, and FIG. 10 is a timing diagram of the brightness compensation process. Taking n=1 as an example, the luminance compensation method of the present invention will be introduced with reference to FIG. 9 and FIG. 10 . The compensation method includes:

S21 , providing data voltages to each light-emitting unit of the display substrate to control the display device to display the Nth frame of images. In FIG. 10 , Frame is a stage of displaying a frame of pictures, wherein, the stage when the data signal Vdata is at a high level indicates an effective stage of displaying the picture. When the compensation enable signal EN becomes a high level, the optical compensation stage is entered.

S22. Determine the light intensity level of each light emitting unit according to the standard brightness of each light emitting unit in the current frame. The standard brightness can be determined according to the driving signal provided by the driving circuit for the display substrate.

S23. According to the light intensity level of each light-emitting unit and the corresponding relationship between the preset light intensity level and the parameters of the photosensitive sensor, adjust the parameters of the photosensitive sensor; the parameters of the photosensitive sensor include photocurrent integration time and signal gain .

S24. When displaying the current frame, determine the light intensity actually received by each photosensitive sensor according to the electrical signal generated by each photosensitive sensor, the temperature detected by each temperature sensor, and the preset signal correspondence; wherein, the signal corresponds to The relationship includes the corresponding relationship between the electrical signal generated by the photosensitive sensor and the received light intensity at different temperatures. The setting method of the signal correspondence has been described above, and will not be repeated here.

Among them, when the screen starts to display, the reset terminal Reset is controlled to reach a high-level signal, thereby resetting the photosensitive sensor, and then the scanning terminal Scan is adjusted to reach a high-level signal to collect the electrical signal generated by the photodiode. The time interval between the high-level signal of the reset terminal Reset and the high-level signal of the scanning terminal Scan is the photocurrent integration time.

S25: Acquire the actual brightness of each light-emitting unit according to the light intensity actually received by each photosensitive sensor.

S26. According to the difference between the actual brightness of each light-emitting unit and the standard brightness, adjust the data voltage of the current frame to reduce the difference between the actual brightness of the light-emitting unit and the standard brightness.

S27. Increase N by 1. Then, it returns to step S21.

Optionally, in step S22, the light intensity level of each light-emitting unit may also be determined according to other methods. For example, a photosensitive sensor may be used to detect the light intensity first, and the light intensity level of the light-emitting unit may be determined according to the intensity detected by the photosensitive sensor. After that, the step of adjusting the parameters of the photosensitive sensor in step S23 is performed.

It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, without departing from the spirit and essence of the present invention, various modifications and improvements can be made, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (8)

1. A display device comprises a display substrate, wherein the display substrate comprises a plurality of light-emitting units, and is characterized in that the display substrate further comprises a plurality of photosensitive sensor groups and a plurality of temperature sensors; each photosensitive sensor group comprises at least one photosensitive sensor; the photosensitive sensors correspond to the light-emitting units one by one and are used for generating corresponding electric signals according to the intensity of the light rays emitted by the corresponding light-emitting units; the temperature sensors correspond to the photosensitive sensor groups one by one and are used for detecting the temperature of the photosensitive sensor groups; the display device further includes:

the calculation module is used for determining the light intensity actually received by each photosensitive sensor according to the corresponding relation of the electric signals generated by each photosensitive sensor, the temperature detected by each temperature sensor and a preset signal when the current frame picture is displayed; the signal corresponding relation comprises a corresponding relation between the electric signals generated by the photosensitive sensors at different temperatures and the intensity of the received light;

the compensation module is used for acquiring the actual brightness of each light-emitting unit according to the light intensity actually received by each photosensitive sensor; adjusting the data voltage of n frames including the current frame according to the difference between the actual brightness and the standard brightness of each light-emitting unit; n is a preset positive integer;

the light intensity level determining module is used for determining the light intensity level of each sub-pixel according to the standard brightness of each light-emitting unit in the current frame picture;

the parameter adjusting module is used for adjusting parameters of the photosensitive sensor according to the light intensity levels of the light emitting units and the corresponding relation between the preset light intensity levels and the parameters of the photosensitive sensor; the parameters of the photosensitive sensor include photocurrent integration time and signal gain.

2. The display device according to claim 1, wherein the light-emitting unit is provided over a substrate, and the photosensor is provided between the light-emitting unit and the substrate;

the temperature sensors are disposed between the photosensors and the substrate, or the temperature sensors are disposed in spaces between adjacent groups of photosensors.

3. The display device according to claim 2, wherein the light-emitting unit comprises: a first electrode, a second electrode, and a light-emitting functional layer provided between the first electrode and the second electrode, the first electrode being provided between the light-emitting functional layer and the substrate; the first electrode is made of metal;

the first electrode has a thickness of

To

And/or a light hole is arranged on the first electrode.

4. The display device according to claim 1, wherein the temperature sensor includes an odd-numbered stage inverting unit, wherein,

the input end of the first-stage inverting unit is connected with the output end of the last-stage inverting unit; in the second stage to the last stage, the input end of each stage of inverting unit is connected with the output end of the preceding stage of inverting unit, the output end of the last stage of inverting unit is used as the output end of the temperature sensor to output a voltage signal oscillating between high and low levels, and the oscillation frequency of the voltage signal corresponds to the temperature of the area where the temperature sensor is located.

5. The display device according to claim 4, wherein the inverting unit comprises: a first N-type transistor and a second N-type transistor;

the grid electrode and the first electrode of the first N-type transistor are both connected with a high-level signal end, and the second electrode of the first N-type transistor is connected with the output end of the phase inversion unit;

the grid electrode of the second N-type transistor is connected with the input end of the phase inversion unit, the first pole of the second N-type transistor is connected with the output end of the phase inversion unit, and the second pole of the second N-type transistor is connected with the low-level input end.

6. The display device according to claim 1, wherein n is 1.

7. A brightness compensation method of a display device, the display device comprises a display substrate, and is characterized in that the display substrate comprises a plurality of light-emitting units, a plurality of photosensitive sensor groups and a plurality of temperature sensors; each photosensitive sensor group comprises at least one photosensitive sensor; the photosensitive sensors correspond to the light-emitting units one by one and are used for generating corresponding electric signals according to the intensity of the light rays emitted by the corresponding light-emitting units; the temperature sensors correspond to the photosensitive sensor groups one by one and are used for detecting the temperature of the photosensitive sensor groups; the brightness compensation method includes:

when a current frame picture is displayed, determining the light intensity actually received by each photosensitive sensor according to the corresponding relation among the electric signals generated by each photosensitive sensor, the temperature detected by each temperature sensor and a preset signal; the signal corresponding relation comprises a corresponding relation between the electric signals generated by the photosensitive sensors at different temperatures and the intensity of the received light;

acquiring the actual brightness of each light-emitting unit according to the light intensity actually received by each photosensitive sensor;

adjusting the data voltage of n frames of pictures including the current frame according to the difference between the actual brightness of each light-emitting unit and the standard brightness; n is a preset positive integer;

before the step of determining the light intensity actually received by each photosensor according to the corresponding relation among the electric signals generated by each photosensor, the temperature detected by each temperature sensor and the preset signals, the method further comprises the following steps:

determining the light intensity level of each light-emitting unit according to the standard brightness of each light-emitting unit in the current frame picture;

adjusting parameters of the photosensitive sensor according to the light intensity level of each light-emitting unit and the corresponding relation between the preset light intensity level and the parameters of the photosensitive sensor; the parameters of the photosensitive sensor include photocurrent integration time and signal gain.

8. The luminance compensation method as claimed in claim 7, wherein n is 1.

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