KR102756340B1 - Electronic apparatus and control method thereof - Google Patents

Abstract

An electronic device is disclosed. The electronic device includes a memory storing first output luminance information corresponding to a first bit image and second output luminance information corresponding to a second bit image, a display panel, a backlight including a plurality of backlight blocks that provide light to the display panel, a driver that individually drives each of the backlight blocks, a processor that identifies brightness information of the received first bit image when the first bit image is received, and controls the driver of at least one backlight block among the plurality of backlight blocks based on the second output luminance information when the brightness information is less than a threshold value, wherein the second bit image may be an image having a higher bit number than the first bit image.

Description

{ Electronic apparatus and control method thereof }

The present invention relates to an electronic device and a control method thereof, and more particularly, to a display device using a plurality of light sources and a control method thereof.

Thanks to the advancement of electronic technology, various types of electronic devices are being developed and distributed. In particular, mobile devices and display devices such as TVs, which are the most widely used devices these days, have been developing rapidly in recent years.

Conventional display devices implement local dimming to output image signals in order to improve dynamic range and contrast ratio. However, when controlling local dimming, there was a problem in that the output luminance difference was expressed significantly compared to the gradation difference between areas within the image, which was detrimental to image quality expression.

In particular, there was a problem that the screen presented to the user contained distorted and exaggerated luminance differences when providing dark images.

The present invention is in accordance with the above-described necessity, and an object of the present invention is to provide a display device and a control method thereof that prevent the problem of excessively highlighting the difference in brightness between areas during local dimming control.

According to an embodiment of the present disclosure to achieve the above objects, an electronic device includes a memory storing first output luminance information corresponding to a first bit image and second output luminance information corresponding to a second bit image, a display panel, a backlight including a plurality of backlight blocks that provide light to the display panel, a driver that individually drives each of the backlight blocks, and a processor that identifies brightness information of the received first bit image when the first bit image is received, and controls the driver based on the second output luminance information of at least one backlight block among the plurality of backlight blocks when the brightness information is less than a threshold value, wherein the second bit image may be an image having a higher bit number than the first bit image.

In addition, the first output luminance information includes luminance information for each grayscale of the first bit image, the second output luminance information includes luminance information for each grayscale of the second bit image, and the processor can, when the brightness information is less than a threshold value, drive a backlight block corresponding to pixels having a grayscale value less than the first threshold grayscale among a plurality of pixels included in the first bit image based on the second output luminance information.

Here, the processor can drive a backlight block corresponding to pixels having a grayscale value higher than the first threshold grayscale among a plurality of pixels included in the first bit image based on the first output luminance information.

In addition, the memory further stores third output luminance information corresponding to the third bit image, and the processor, if the luminance information is less than a threshold value, drives a backlight block corresponding to pixels having a grayscale value greater than or equal to the first threshold grayscale and less than a second threshold grayscale based on the first output luminance information, and drives a backlight block corresponding to pixels having a grayscale value greater than or equal to the second threshold grayscale based on the third output luminance information, and the third bit image may be an image having a smaller number of bits than the first bit image.

In addition, the processor can identify the first bit image as an area corresponding to each of the plurality of backlight blocks, identify a backlight block corresponding to pixels having a grayscale value lower than the first threshold grayscale based on an average grayscale value of each of the identified areas, and drive the identified backlight block based on the second output luminance information.

Here, the processor can drive at least one backlight block adjacent to the identified backlight block based on the second output brightness information.

Additionally, the processor can obtain the brightness information based on at least one of an average picture level (APL) of the first bit image or a grayscale histogram of the first bit image.

Here, the processor can identify whether the brightness information is below the threshold value by applying different weights to each of the average picture level (APL) of the first bit image and the grayscale histogram.

Additionally, the first bit image may be a 10-bit image, and the first output luminance information may include output luminance information of each of 1024 grayscale levels, and the second bit image may be an 11-bit image, and the second output luminance information may include output luminance information of each of 2048 grayscale levels.

Meanwhile, a method for controlling an electronic device including first output luminance information corresponding to a first bit image and second output luminance information corresponding to a second bit image includes a step of identifying brightness information of the received first bit image when the first bit image is received, and a step of controlling at least one backlight block among a plurality of backlight blocks included in a backlight that provides light to a display panel based on the second output luminance information when the brightness information is less than a threshold value, wherein the second bit image is an image having a higher bit number than the first bit image.

In addition, the first output luminance information includes luminance information for each grayscale of the first bit image, the second output luminance information includes luminance information for each grayscale of the second bit image, and the controlling step may include a step of driving a backlight block corresponding to pixels having a grayscale value lower than a first threshold grayscale among a plurality of pixels included in the first bit image based on the second output luminance information when the brightness information is lower than a threshold value.

In addition, the controlling step may include a step of driving a backlight block corresponding to pixels having a grayscale value higher than the first threshold grayscale among a plurality of pixels included in the first bit image based on the first output luminance information.

In addition, the electronic device further includes third output brightness information corresponding to the third bit image, and the controlling step includes: a step of driving a backlight block corresponding to pixels having a grayscale value higher than or equal to the first threshold grayscale and lower than a second threshold grayscale based on the first output brightness information when the brightness information is lower than a threshold value; a step of driving a backlight block corresponding to pixels having a grayscale value higher than or equal to the second threshold grayscale based on the third output brightness information, and the third bit image may be an image having a smaller number of bits than the first bit image.

In addition, the controlling step may include a step of identifying the first bit image as an area corresponding to each of the plurality of backlight blocks, a step of identifying a backlight block corresponding to pixels having a grayscale value lower than the first threshold grayscale based on an average grayscale value of each of the identified areas, and a step of driving the identified backlight block based on the second output luminance information.

Here, the controlling step may include a step of driving at least one backlight block adjacent to the identified backlight block based on the second output brightness information.

Additionally, the identifying step may include a step of obtaining the brightness information based on at least one of an average picture level (APL) of the first bit image or a grayscale histogram of the first bit image.

Here, the identifying step may include a step of identifying whether the brightness information is less than the threshold value by applying different weights to each of the average picture level (APL) of the first bit image and the grayscale histogram.

Additionally, the first bit image may be a 10-bit image, and the first output luminance information may include output luminance information of each of 1024 grayscale levels, and the second bit image may be an 11-bit image, and the second output luminance information may include output luminance information of each of 2048 grayscale levels.

Meanwhile, a non-transitory computer-readable medium storing computer instructions that, when executed by a processor of an electronic device, cause the electronic device to perform an operation, the operation includes: when a first bit image is received, identifying brightness information of the received first bit image; and when the brightness information is less than a threshold value, controlling at least one backlight block among a plurality of backlight blocks included in a back light that provides light to a display panel based on second output brightness information corresponding to a second bit image, wherein the second bit image is an image having a higher bit number than the first bit image.

As described above, according to various embodiments of the present disclosure, local dimming can be effectively implemented when displaying an image using multiple light sources.

In addition, according to various embodiments of the present disclosure, it is possible to provide a user with an image in which the problem of brightness and luminance differences between areas being excessively highlighted when providing a somewhat dark image is resolved.

In addition, according to various embodiments of the present disclosure, the brightness of a dark image can be expressed more efficiently and accurately and provided to the user.

FIG. 1 is a drawing for explaining the characteristics of a display panel according to one embodiment of the present disclosure.
FIG. 2 is a block diagram showing the configuration of an electronic device according to an embodiment of the present disclosure.
FIG. 3 is a drawing for explaining a local dimming method according to one embodiment of the present disclosure.
FIG. 4 is a drawing for explaining a local dimming method according to one embodiment of the present disclosure.
FIG. 5 is a drawing for explaining brightness information according to one embodiment of the present disclosure.
FIG. 6 is a diagram for explaining first output luminance information according to one embodiment of the present disclosure.
FIG. 7 is a diagram for explaining second output luminance information according to one embodiment of the present disclosure.
FIG. 8 is a diagram for explaining first and second output luminance information according to one embodiment of the present disclosure.
FIG. 9 is a drawing for explaining output luminance information corresponding to an image according to one embodiment of the present disclosure.
FIG. 10 is a drawing for explaining a tone histogram according to one embodiment of the present disclosure.
FIG. 11 is a drawing for explaining brightness information according to another embodiment of the present disclosure.
FIG. 12 is a diagram for explaining third output luminance information according to one embodiment of the present disclosure.
FIG. 13 is a drawing for explaining output luminance information corresponding to an image according to one embodiment of the present disclosure.
FIG. 14 is a flowchart for explaining a method for controlling an electronic device according to an embodiment of the present disclosure.

Hereinafter, the present disclosure will be described in detail with reference to the attached drawings.

The terms used in the embodiments of the present disclosure are selected from commonly used terms that are as much as possible while considering the functions of the present disclosure, but this may vary depending on the intention of a technician working in the relevant field, precedents, the emergence of new technologies, etc. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meanings thereof will be described in detail in the description of the relevant disclosure. Therefore, the terms used in the present disclosure should be defined based on the meanings of the terms and the overall contents of the present disclosure, rather than simply the names of the terms.

In this specification, the expressions “have,” “can have,” “include,” or “may include” indicate the presence of a given feature (e.g., a component such as a number, function, operation, or part), and do not exclude the presence of additional features.

The expression "at least one of A and/or B" should be understood to mean either "A" or "B" or "A and B".

The expressions “first,” “second,” “first,” or “second,” as used herein, can describe various components, regardless of order and/or importance, and are only used to distinguish one component from other components and do not limit the components.

When it is said that a component (e.g., a first component) is "(operatively or communicatively) coupled with/to" or "connected to" another component (e.g., a second component), it should be understood that the component can be directly coupled to the other component, or can be coupled through another component (e.g., a third component).

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "consist of" and the like are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood to not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

In the present disclosure, a “module” or “part” performs at least one function or operation, and may be implemented by hardware or software, or by a combination of hardware and software. In addition, a plurality of “modules” or a plurality of “parts” may be integrated into at least one module and implemented by at least one processor (not shown), except for a “module” or “part” that needs to be implemented by a specific hardware.

In this specification, the term user may refer to a person using an electronic device or a device using an electronic device (e.g., an artificial intelligence electronic device).

An embodiment of the present disclosure will be described in more detail with reference to the attached drawings below.

FIG. 1 is a drawing for explaining the characteristics of a display panel according to one embodiment of the present disclosure.

An electronic device (100) according to an embodiment of the present disclosure displays video data. The electronic device (100) may be implemented as a TV, but is not limited thereto, and may be applied to any device having a display function, such as a video wall, a large format display (LFD), a digital signage, a digital information display (DID), a projector display, etc., without limitation. In addition, the electronic device (100) may be implemented as various types of displays, such as an LCD (liquid crystal display), an OLED (organic light-emitting diode), an LCoS (Liquid Crystal on Silicon), a DLP (Digital Light Processing), a QD (quantum dot) display panel, a QLED (quantum dot light-emitting diodes), a μLED (Micro light-emitting diodes), a Mini LED, etc. Meanwhile, the electronic device (100) may also be implemented as a touch screen combined with a touch sensor, a flexible display, a rollable display, a 3D display, a display in which a plurality of display modules are physically connected, etc.

In order for a display panel implemented with a non-self-luminous element according to one embodiment of the present disclosure, for example, a liquid crystal display (LCD) panel, to display an image, a backlight must be provided in the display module.

An LCD panel that implements an image using a backlight maintains an output image signal for a certain period of time in order to display an image. In addition, a backlight according to an embodiment of the present disclosure uses backlight dimming. Backlight dimming can be divided into local dimming, which divides a screen into a number of areas and individually controls the backlight lighting time for each area, and global dimming, which collectively controls the backlight lighting time for the entire screen.

An electronic device (100) according to an embodiment of the present disclosure can provide an image using local dimming. Meanwhile, if an image provided by the electronic device (100) through a screen is a somewhat dark image, when the image is displayed using local dimming, which divides the screen into a number of areas and individually controls the backlight lighting time for each area, a problem occurs in which the brightness difference between the multiple areas is somewhat distorted.

For example, in a somewhat dark image, even if the difference in gradation between a specific region and an adjacent region is very low among a number of segmented regions, a problem may arise in which the difference in output luminance between the specific region and the adjacent region is high. Accordingly, various embodiments capable of reducing the difference in output luminance will be described below.

FIG. 2 is a block diagram showing the configuration of an electronic device according to an embodiment of the present disclosure.

According to FIG. 2, the electronic device (100) includes a memory (110), a display panel (120), a backlight (130), a driver (140), and a processor (150).

A memory (110) according to one embodiment of the present disclosure stores various data such as an O/S (Operating System) software module for driving an electronic device (100) and various multimedia contents.

In particular, the memory (110) may store first output luminance information corresponding to the first bit image and second output luminance information corresponding to the second bit image.

Here, the first output luminance information may include luminance information for each grayscale of the first bit image, and the second output luminance information may include luminance information for each grayscale of the second bit image. Here, the grayscale is an integer that expresses the brightness of each pixel included in the image. For example, an 8-bit image may be expressed as a grayscale level of 0 to 255, and the luminance information for each grayscale of the 8-bit image may include luminance information corresponding to each of the grayscale levels of 0 to 255. Meanwhile, the output luminance is proportional to the intensity of power applied to the backlight (130), that is, the duty ratio, and the output luminance information may also be called a power curve, but for the convenience of explanation, it will be collectively referred to as output luminance information.

As another example, a 10-bit image can be expressed in grayscale levels from 0 to 1023, and luminance information for each grayscale of the 10-bit image can include luminance information corresponding to each grayscale level from 0 to 1023. Here, specific numbers such as 8 bits and 10 bits are merely examples for convenience of explanation and are not limited thereto. For example, the electronic device (100) can receive, store, or output various bit images. A specific description thereof will be described later with reference to FIGS. 6 and 7.

Meanwhile, the integer corresponding to the brightness of each pixel can be expressed as a grayscale value, a brightness value, a brightness code, etc., but in this disclosure, it is generally referred to as a grayscale value for convenience of explanation.

The display panel (120) includes a plurality of pixels and can display an image. In one embodiment, the display panel (120) can be implemented as a liquid crystal display panel. The liquid crystal panel is a display panel implemented as a liquid crystal element, which is a display element using liquid crystals that can electrically control the transmittance of light.

According to one embodiment, the display panel (120) may operate by injecting liquid crystals between two glass plates, and allowing the injected liquid crystals to pass light supplied from a backlight (130) through the ON/OFF of a thin film transistor in a vertical alignment and horizontal twisted alignment, thereby injecting the light onto the entire surface of the display panel (120).

Meanwhile, since the liquid crystal panel is implemented with a liquid crystal element that does not emit light by itself, the electronic device (100) must be equipped with a backlight (130) in order for the liquid crystal panel to implement an image. The backlight (130) plays a role in evenly illuminating the display image so that it can be seen.

A backlight (130) according to an embodiment of the present disclosure may include a plurality of backlight blocks, a light guide plate, and a light sheet. The backlight (130) may emit monochromatic light (light of a specific wavelength) when power is supplied. In particular, the backlight (130) according to an embodiment of the present disclosure may emit white light.

Each of the plurality of backlight blocks provided in the backlight (130) according to one embodiment of the present disclosure includes a light source, and the light source may be implemented as a blue light emitting diode (Blue LED) for high color reproducibility. In addition, the light sheet may be implemented as a quantum dot (QD) sheet. Here, the quantum dot sheet may convert the wavelength of light emitted from the plurality of light sources depending on the size of the particles to generate various colors. For example, the light sheet may convert the wavelength of a portion of B (Blue) light emitted from the light source to generate R (Red) light and G (Green) light. Meanwhile, since the light sheet converts the wavelength of light, it may also be called a wavelength conversion unit, but for the convenience of explanation, it will be collectively referred to as a light sheet.

The display panel (110) includes a plurality of pixels, and can control the brightness of each of the plurality of pixels using liquid crystals. For example, when the display panel (110) displays a relatively dark image based on an image signal, the display panel (110) can display a low-brightness image by blocking a large amount of light supplied from a backlight (130) by the liquid crystals. As another example, when the display panel (110) displays a relatively bright image based on an image signal, the display panel (110) can display a high-brightness image by allowing a large amount of light supplied from a backlight (130) to pass through the liquid crystals.

Meanwhile, since it is somewhat impossible for the liquid crystal of the display panel (110) to block all light emitted from the light source (121), the backlight (130) can individually drive multiple light sources (121) under the control of the processor (150) to implement local dimming in order to more appropriately express low-brightness images, expand the dynamic range, and improve the contrast ratio.

Here, the backlight (130) may be divided into a plurality of backlight blocks, and each of the plurality of backlight blocks may include at least one light source. According to one embodiment, each of the plurality of backlight blocks may correspond to a different area of the display panel (120). A detailed description thereof will be given with reference to FIGS. 3 and 4.

According to an embodiment of the present invention, the processor (150) may be implemented as a digital signal processor (DSP) for processing a digital image signal, a microprocessor, an Artificial Intelligence (AI) processor, or a Timing controller (T-CON). However, the present invention is not limited thereto, and may include one or more of a central processing unit (CPU), a Micro Controller Unit (MCU), a Micro processing unit (MPU), a controller, an application processor (AP), a communication processor (CP), or an ARM processor, or may be defined by the corresponding terms. In addition, the processor (150) may be implemented as a System on Chip (SoC) having a processing algorithm built-in, a Large Scale Integration (LSI), or may be implemented in the form of a Field Programmable gate array (FPGA).

The processor (150) drives the backlight (130) to provide light to the display panel (110). Specifically, the processor (150) controls and outputs at least one of the supply time and intensity of the driving current (or driving voltage) supplied to the backlight (130). Specifically, the processor (150) can control the brightness of the light sources included in the backlight (130) by pulse width modulation (PWM) with a variable duty ratio, or control the brightness of the light sources of the backlight (130) by varying the intensity of the current. Here, the pulse width modulation signal (PWM) controls the ratio of turning on and off the light sources, and the duty ratio (duty ratio %) is determined according to a dimming value input from the processor (150).

Meanwhile, the electronic device (100) according to one embodiment of the present disclosure may include a driver (140) (or driver IC) for individually controlling each of a plurality of backlight blocks included in the backlight (130), and the processor (150) may be implemented in a form that controls the display panel (120) and the backlight (130) through the driver (140). As another example, the processor (150) may be implemented in a form that includes a driver IC for driving the backlight (130). For example, the processor (150) may be implemented as a DSP and may be implemented as one chip with a digital driver IC. However, it goes without saying that the driver IC may be implemented as separate hardware from the processor (150). For example, when the light sources included in the backlight (130) are implemented as LED elements, the driver IC may be implemented as at least one LED driver that controls the current applied to the LED elements. According to one embodiment, the LED driver may be placed after a power supply (e.g., a switching mode power supply (SMPS)) and may receive voltage from the power supply. However, according to another embodiment, the voltage may be received from a separate power supply. Alternatively, the SMPS and the LED driver may be implemented in a module form in which they are integrated into one.

FIG. 3 is a drawing for explaining a plurality of light sources according to one embodiment of the present disclosure.

According to one embodiment, the processor (150) may identify an input image as an image block of a specific size. For example, referring to FIG. 3, the processor (150) may identify a first bit image as an area corresponding to each of a plurality of backlight blocks.

FIG. 4 is a drawing for explaining a local dimming method according to one embodiment of the present disclosure.

Referring to FIG. 4, the backlight (130) may be implemented as a direct-type backlight unit. For example, the direct-type backlight unit may be implemented as a structure in which a plurality of optical sheets and a diffusion plate are laminated under the display panel (110) and a plurality of light sources are arranged under the diffusion plate.

In the case of a direct-type backlight unit, it can be divided into a plurality of backlight blocks as illustrated in Fig. 4 based on the arrangement structure of a plurality of light sources. In this case, each of the plurality of backlight blocks can be driven according to the current duty (or duty ratio) based on the image information of the corresponding screen area.

For example, the backlight (130) may be divided into a plurality of backlight blocks, and a first backlight block (130-1) among the plurality of backlight blocks may correspond to a first area (e.g., the upper left corner) of the display panel (120). Here, the correspondence may mean that light emitted from a first light source included in the first backlight block is provided to the first area of the display panel (120).

As another example, a second backlight block (130-2) among a plurality of backlight blocks may correspond to a second area of the display panel (120). Accordingly, light emitted by a second light source included in the second backlight block may be provided to the second area.

Returning to FIG. 2, the processor (150) according to one embodiment of the present disclosure may identify brightness information of the received first bit image when the first bit image is received. Then, if the identified brightness information is less than a threshold value, the processor (150) may control at least one backlight block among a plurality of backlight blocks provided in the backlight (130) based on the second output brightness information. Here, the brightness information of the first bit image may be an average picture level (Average Picture Level, hereinafter referred to as “APL”) per frame of the image. A detailed description thereof will be given with reference to FIG. 5.

FIG. 5 is a drawing for explaining brightness information according to one embodiment of the present disclosure.

Referring to FIG. 5, a processor (150) according to an embodiment of the present disclosure can identify an average image level per frame of an image as brightness information of the image. For example, the brightness information of the image can be an average grayscale value for pixel data of one frame of the image. In this case, a higher APL can be a relatively brighter image, and a lower APL can be a relatively darker image.

However, the brightness information of the image may mean various characteristics related to the brightness of the image, such as the maximum grayscale value and the most frequent grayscale value within the frame other than the APL. For example, the brightness information may mean the grayscale histogram of the image. A detailed description thereof will be given with reference to Fig. 10.

A processor (150) according to an embodiment of the present disclosure can identify whether brightness information of a first bit image is less than a threshold value. Here, the threshold value may be a value set to identify whether the corresponding image corresponds to a dark image. For example, the processor (150) can obtain a threshold value according to a value set by a manufacturer, a value set by a user, or a value identified based on metadata of the image, and identify whether brightness information of the first bit image is less than the threshold value.

For example, the processor (150) can obtain the average image level of the first bit image as brightness information and identify whether the average image level is less than 6%. Here, 6% is only an example of a threshold value and is not limited thereto.

Referring to FIG. 5, the processor (150) can identify that the brightness information of the first bit image is less than the threshold value because the average image level of the first bit image is 4.3%. Then, the processor (150) can control at least one backlight block among the plurality of backlight blocks constituting the backlight (130) based on the second output brightness information, not the first output brightness information corresponding to the first bit image. A specific description of the first output brightness information and the second output brightness information will be made with reference to FIG. 6 and FIG. 7.

FIG. 6 is a diagram for explaining first output luminance information according to one embodiment of the present disclosure.

An electronic device (100) according to an embodiment of the present disclosure may include first output luminance information. For example, the electronic device (100) may store first output luminance information corresponding to a first bit image. Here, the first bit image may mean 8 bits, but this is only an example and is not limited thereto. For example, the first bit image may be various bit images such as 10 bits. For convenience of explanation, the first bit image will be explained assuming an 8-bit image.

Referring to FIG. 6, the X-axis represents the grayscale of the input image, and the Y-axis represents the output luminance (Nits). For example, in the case of an 8-bit image, the grayscale is expressed as an integer of grayscale levels from 0 to 255, so the graph illustrated in FIG. 6 can represent the output luminance corresponding to each of the grayscale levels from 0 to 255. Here, the output luminance can be proportional to the intensity of the current applied to the backlight (130).

A processor (150) according to one embodiment of the present disclosure may provide a first bit image based on first output luminance information. For example, the processor (150) may output a grayscale value (or grayscale level, brightness code) of 10 among grayscales included in the first bit image as an output luminance of 25 (Nits) based on the graph illustrated in FIG. 6.

An electronic device (100) according to an embodiment of the present disclosure may include second output luminance information corresponding to a second bit that is different from the first bit. A detailed description thereof will be given with reference to FIG. 7.

FIG. 7 is a diagram for explaining second output luminance information according to one embodiment of the present disclosure.

An electronic device (100) according to an embodiment of the present disclosure may include second output luminance information. For example, the electronic device (100) may store second output luminance information corresponding to a second bit image. Here, the second bit image may mean 10 bits, but this is only an example and is not limited thereto. For example, the second bit image may mean an image having a higher bit number than the first bit image, and if the first bit image is an 8 bit image, the second bit image may be an image having a bit number greater than 8 bits, such as 10 bits or 11 bits. For convenience of explanation, the second bit image will be explained assuming a 10 bit image.

The second output luminance information may include luminance information for each grayscale. Referring to FIG. 7, the X-axis represents the grayscale of the input image, and the Y-axis represents the output luminance (Nits). For example, in the case of a 10-bit image, the grayscale is expressed as an integer of grayscale levels from 0 to 1023, so the graph illustrated in FIG. 7 may represent the output luminance corresponding to each grayscale level from 0 to 1023. Here, the output luminance may be proportional to the intensity of the current applied to the backlight (130).

A processor (150) according to an embodiment of the present disclosure may provide a second bit image based on second output luminance information. For example, the processor (150) may output a grayscale value (or grayscale level, brightness code) of 1023 among grayscales included in the second bit image as an output luminance of 1000 (Nits) based on the graph illustrated in FIG. 7.

Meanwhile, the processor (150) according to one embodiment of the present disclosure can control at least one backlight block among a plurality of backlight blocks based on second output brightness information, not first output brightness information, if the brightness information of the first bit image is less than a threshold value. A detailed description thereof will be given with reference to FIG. 8.

FIG. 8 is a diagram for explaining first and second output luminance information according to one embodiment of the present disclosure.

As illustrated in Fig. 8, it can be assumed that the brightness information of the first bit image is less than a threshold value. For example, if the average picture level (APL) of the first bit image is less than 6%, a backlight block corresponding to pixels having a grayscale value less than the first threshold grayscale among a plurality of pixels included in the first bit image can be driven based on the second output brightness information.

For example, the image illustrated in FIG. 8 is an 8-bit image, and the output luminance information corresponding to the 8-bit image may include output luminance corresponding to each of the grayscale levels from 0 to 255. However, if local dimming is applied to the 8-bit image based on the first output luminance information, there is a problem that the luminance difference between a specific area and an adjacent area may be distorted or the luminance difference may be large. For example, if an 8-bit image is divided into a plurality of areas, and the grayscale difference between a specific area and an adjacent area among the plurality of areas is not large, the output luminance difference between the specific area and the adjacent area may be large. Referring to the graph illustrated in FIG. 6, it can be assumed that the grayscale level of a specific area in the 1-bit image is 10, and the output luminance corresponding to the grayscale level 10 is 39. If the grayscale level of an area adjacent to the specific area is 20, and the output luminance corresponding to the grayscale level 20 is 78, the grayscale level difference is 10 and the output luminance difference is 39. There is a problem in that if the brightness information of the 1-bit image is below the threshold value, that is, if the 1-bit image is a rather dark image, the user perceives the output brightness difference of 39 as a rather large brightness difference, and thus perceives that the image is distorted.

According to one embodiment of the present disclosure, if the brightness information of the first bit image is less than a threshold value, the processor (150) can drive a backlight block corresponding to pixels having a grayscale value less than the first threshold grayscale among a plurality of pixels included in the first bit image based on second output brightness information.

Referring to FIG. 8, it can be assumed that the grayscale level of a specific area in the first bit image is 10, and the output luminance corresponding to the grayscale level 10 according to the second output luminance information is 9.77. If the grayscale level of an area adjacent to the specific area is 20, and the output luminance corresponding to the grayscale level 20 is 19, the grayscale level difference is 10, and the output luminance difference between the specific area and the adjacent area is approximately 9.8. Since the user perceives the output luminance difference of 9.8 as a relatively small luminance difference, he or she feels comfortable when watching a dark image.

Meanwhile, the graphs shown in FIGS. 6 to 8 are graphs that assume that the maximum output brightness of the electronic device (100) is 1000 (Nits) and that the increase in output brightness according to the increase in the gray level is linear, and are not limited thereto.

For example, the maximum output brightness of an electronic device (100) may vary depending on the manufacturer's manufacturing purpose, manufacturing specifications, and settings at the time of manufacturing, and it is obvious that the increase in output brightness due to an increase in the grayscale level may be non-linear.

Referring to FIG. 8, the processor (150) can identify the first bit image as an area corresponding to each of a plurality of backlight blocks.

Next, if the brightness information of the first bit image is less than the threshold value, the processor (15) may identify a backlight block corresponding to pixels having a grayscale value less than the first threshold grayscale based on the average grayscale value of each identified area, and drive the identified backlight block based on the second output luminance information. For example, the processor (150) may drive an area having an a grayscale value less than the first threshold grayscale among a plurality of areas included in the first bit image at an output luminance of 10 nits based on the second output luminance information. In addition, the processor (150) may drive an area having a b grayscale value greater than or equal to the first threshold grayscale among the plurality of areas at an output luminance of 900 nits based on the first output luminance information. Here, the first threshold grayscale may of course be variously changed depending on a user's setting value, an image characteristic, a manufacturer's setting value, etc.

The output luminance information applied to the first bit image illustrated in Fig. 8 is a mixture of the first output luminance information and the second output luminance information, and a detailed description thereof will be provided with reference to Fig. 9.

FIG. 9 is a drawing for explaining output luminance information corresponding to an image according to one embodiment of the present disclosure.

Referring to FIG. 9, if the first threshold grayscale is a', the processor (150) can drive a pixel or area having a grayscale value less than a' based on second output luminance information corresponding to the second bit image. In addition, the processor (150) can drive a pixel or area having a grayscale value greater than a' based on first output luminance information corresponding to the first bit image.

Referring to FIG. 9, when the amount of change in the grayscale value is the same, the output luminance difference (x) based on the second output luminance information may be different from the output luminance difference (y) based on the first output luminance information. For example, the output luminance difference (x) based on the second output luminance information may have a relatively smaller amount of change than the output luminance difference (y) based on the first output luminance information.

Since a grayscale value lower than the first critical grayscale (a’) indicates a somewhat dark pixel or area, if the amount of change in output luminance according to the amount of change in grayscale value in the grayscale range lower than the first critical grayscale (a’), that is, from 0 to a’, is reduced, the user may feel less distortion in brightness when watching a dark image.

Returning to FIG. 2, the processor (150) according to one embodiment of the present disclosure can obtain brightness information based on at least one of an average picture level (APL) of a first bit image or a grayscale histogram of the first bit image. A specific description of the grayscale histogram will be made with reference to FIG. 10.

FIG. 10 is a drawing for explaining a tone histogram according to one embodiment of the present disclosure.

The tone histogram illustrated in Fig. 10 represents the tone distribution of multiple tones included in the first bit image illustrated in Fig. 8.

For example, among the total pixels included in the first bit image, pixels belonging to the grayscale levels 0 to 40 may account for 85%, and pixels belonging to the grayscale levels 41 to 80 may account for 10%. In addition, it may be assumed that pixels belonging to the grayscale level 121 or higher account for 0% of the total pixels. In this case, the processor (150) may identify that the brightness information of the first bit image is less than the threshold value. For example, the processor (150) may identify that the brightness information of the first bit image is less than the threshold value when 0% of the total pixels included in the first bit image have grayscales greater than the threshold grayscale. Here, it should be understood that the threshold grayscale may be varied in various ways depending on the user's settings, the manufacturer's settings, the brightness characteristics of the first bit image, etc.

FIG. 11 is a drawing for explaining brightness information according to another embodiment of the present disclosure.

Referring to FIG. 11, a processor (150) according to an embodiment of the present disclosure can identify whether brightness information is below a threshold value by applying different weights to each of an average picture level (APL) and a grayscale histogram of a first bit image.

For example, the processor (150) can identify that the brightness information of the first bit image is below the threshold value if the average image level (APL) of the first bit image is below the threshold value when the grayscale above a specific grayscale value is not 0% based on the grayscale histogram of the first bit image.

As another example, the processor (150) may identify whether the brightness information of the first bit image is below a threshold value by assigning different weights to the grayscale ratio (%) below a specific grayscale value and the average image level of the first bit image based on the grayscale histogram of the first bit image. For example, if the average image level of the first bit image is below 10%, the processor (150) may identify whether the grayscale ratio (%) below a specific grayscale value exceeds 50% based on the grayscale histogram of the first bit image. Meanwhile, specific numbers and ratios are merely examples for the convenience of explanation and are not limited thereto.

FIG. 12 is a diagram for explaining third output luminance information according to one embodiment of the present disclosure.

An electronic device (100) according to an embodiment of the present disclosure may further include third output luminance information corresponding to a third bit image in addition to the first and second output luminance information.

For example, the third bit image is an 11-bit image, and the third output luminance information may include output luminance corresponding to each of the grayscale levels from 0 to 2047. Here, 11 bits is an example and is not limited thereto.

For example, the first bit image may be a 10-bit image, and the first output luminance information may include output luminance information of each of 1024 grayscale levels (e.g., grayscale levels 0 to 1023). Additionally, the second bit image may be an 11-bit image, and the second output luminance information may include output luminance information of each of 2048 grayscale levels (e.g., grayscale levels 0 to 2047).

Additionally, the third bit image is an 8-bit image, and the third output luminance information may include output luminance information of each of 256 grayscale levels (e.g., grayscale levels 0 to 255).

According to an embodiment of the present disclosure, the processor (150) may drive a backlight block corresponding to pixels or an area having a grayscale value lower than the first threshold grayscale based on third output luminance information when the brightness information of the first bit image is lower than the threshold value. In addition, the processor (150) may drive a backlight block corresponding to pixels or an area having a grayscale value higher than the first threshold grayscale and lower than the second threshold grayscale based on second output luminance information. In addition, the processor (150) may drive a backlight block corresponding to pixels or an area having a grayscale value higher than the second threshold grayscale based on first output luminance information. That is, the processor (150) may provide a first bit image by mixing the first to third output luminance information.

For example, if the brightness information of the 8-bit image is less than the threshold value, the processor (150) may drive a backlight block corresponding to a pixel or an area having a grayscale value less than the first threshold grayscale based on output brightness information corresponding to the 11-bit image. In addition, the processor (150) may drive a backlight block corresponding to a pixel or an area having a grayscale value greater than or equal to the first threshold grayscale and less than or equal to the second threshold grayscale based on output brightness information corresponding to the 10-bit image. In addition, the processor (150) may drive a backlight block corresponding to a pixel or an area having a grayscale value greater than or equal to the second threshold grayscale based on output brightness information corresponding to the 8-bit image.

Since the processor (150) reduces the output luminance change amount between pixels or areas with somewhat dark grayscale values and maintains the output luminance change amount between pixels or areas with somewhat bright grayscale values, the user may not feel that the brightness of the image is distorted.

Meanwhile, it is an example of a configuration in which the processor (150) drives the backlight (130) using the first to third output luminance information, and it is of course not limited thereto. For example, it is of course possible for the processor (150) to drive the backlight (130) using the first to fourth output luminance information. Here, the fourth output luminance information may be output luminance information corresponding to a fourth bit image that is different from the first to third bits.

FIG. 13 is a drawing for explaining output luminance information corresponding to an image according to one embodiment of the present disclosure.

Referring to FIG. 13, a processor (150) according to an embodiment of the present disclosure may identify an area corresponding to each of a plurality of backlight blocks in the first bit image if the brightness information of the first bit image is less than a threshold value. Then, the processor (150) may identify a backlight block corresponding to pixels having a grayscale value less than the first threshold grayscale based on an average grayscale value of each of the identified areas.

For example, referring to FIGS. 3 and 4, the processor (150) may identify an average grayscale value of each of M x N regions, and identify a region having a grayscale value lower than a first threshold grayscale among the plurality of average grayscale values. Subsequently, the processor (150) may identify a backlight block that provides light to the identified region.

The processor (150) can drive the identified backlight block based on the second output brightness information.

Meanwhile, the processor (150) can also drive a backlight block adjacent to the identified backlight block based on the second output luminance information.

For example, since the grayscale value of an area adjacent to an area having a grayscale value lower than the first threshold grayscale in a first-bit image is often also lower than the first threshold grayscale, the processor (150) can also drive a backlight block adjacent to the identified backlight block based on the second output luminance information. Since the processor (150) drives a specific backlight block and a backlight block adjacent to the specific backlight block based on the same output luminance information (e.g., the second output luminance information), the difference in output luminance between areas can be minimized, and there is an effect of reducing the amount of output luminance variation between areas.

Returning to FIG. 2, a memory (110) according to an embodiment of the present disclosure is electrically connected to the processor (150) and can store data required for various embodiments of the present disclosure. For example, the memory (110) may be implemented as an internal memory such as a ROM (e.g., an electrically erasable programmable read-only memory (EEPROM)), a RAM, etc. included in the processor (150), or may be implemented as a separate memory from the processor (150).

The memory (110) may be implemented in the form of a memory embedded in the electronic device (100) or may be implemented in the form of a memory that can be attached or detached from the electronic device (100) depending on the purpose of data storage. For example, data for driving the electronic device (100) may be stored in a memory embedded in the electronic device (100), and data for expanding the functions of the electronic device (100) may be stored in a memory that can be attached or detached from the electronic device (100). When implemented as a memory embedded in an electronic device (100), the memory (110) may be at least one of a volatile memory (e.g., dynamic RAM (DRAM), static RAM (SRAM), or synchronous dynamic RAM (SDRAM)), a non-volatile memory (e.g., one time programmable ROM (OTPROM), programmable ROM (PROM), erasable and programmable ROM (EPROM), electrically erasable and programmable ROM (EEPROM), mask ROM, flash ROM, flash memory (e.g., NAND flash or NOR flash), a hard drive, or a solid state drive (SSD)).

When implemented as a memory that can be attached to an electronic device (100), the memory (110) may be a memory card (e.g., CF (compact flash), SD (secure digital), Micro-SD (micro secure digital), Mini-SD (mini secure digital), xD (extreme digital), MMC (multi-media card), etc.), an external memory (e.g., USB memory) that can be connected to a USB port, etc.

The input unit (not shown) receives various types of content. For example, the input unit can receive video signals in the form of streaming or downloading from an external device (e.g., a source device), an external storage medium (e.g., a USB memory), an external server (e.g., a web hard drive), etc. via a communication method such as AP-based Wi-Fi (Wireless LAN network), Bluetooth, Zigbee, wired/wireless LAN (Local Area Network), WAN (Wide Area Network), Ethernet, IEEE 1394, HDMI (High-Definition Multimedia Interface), USB (Universal Serial Bus), MHL (Mobile High-Definition Link), AES/EBU (Audio Engineering Society/European Broadcasting Union), Optical, or Coaxial. Here, the video signal may be any one of a digital video signal of SD (Standard Definition), HD (High Definition), Full HD, or Ultra HD video, but is not limited thereto.

The output unit (not shown) outputs an audio signal. For example, the output unit may convert a digital audio signal processed by the processor (150) into an analog audio signal, amplify the converted signal, and output the converted signal. For example, the output unit may include at least one speaker unit, a D/A converter, an audio amplifier, etc. capable of outputting at least one channel. According to an example, the output unit may be implemented to output various multi-channel audio signals. In this case, the processor (150) may control the output unit to perform enhancement processing on the input audio signal to correspond to the enhancement processing of the input image and output the processed signal. For example, the processor (150) may convert an input 2-channel audio signal into a virtual multi-channel (e.g., 5.1 channel) audio signal, recognize a position where the display device (100') is placed, and process the converted signal into a stereoscopic audio signal optimized for the space, or provide an optimized audio signal according to the type of the input image (e.g., content genre).

The user interface (not shown) may be implemented by devices such as buttons, touch pads, mouse, and keyboards, or may be implemented by a touch screen, a remote control transmitter/receiver, etc. that can also perform the display function and operation input function described above. The remote control transmitter/receiver may receive a remote control signal from an external remote control device or transmit a remote control signal via at least one of infrared communication, Bluetooth communication, and Wi-Fi communication.

The electronic device (100) may additionally include a tuner and a demodulator according to an implementation example. The tuner (not shown) may tune a channel selected by a user or all pre-stored channels among RF (Radio Frequency) broadcast signals received through an antenna to receive an RF broadcast signal. The demodulator (not shown) may receive and demodulate a digital IF signal (DIF) converted by the tuner and may perform channel decoding, etc. According to an embodiment, an input image received through the tuner may be processed through the demodulator (not shown) and then provided to the processor (150) for image processing according to an embodiment of the present disclosure.

FIG. 14 is a flowchart for explaining a method for controlling an electronic device according to an embodiment of the present disclosure.

According to one embodiment of the present disclosure, a method for controlling an electronic device including first output luminance information corresponding to a first bit image and second output luminance information corresponding to a second bit image includes: first, when a first bit image is received, brightness information of the received first bit image is identified (S1410).

Next, if the brightness information is less than the threshold value, at least one backlight block among a plurality of backlight blocks included in the backlight that provides light to the display panel is controlled based on the second output brightness information (S1420).

Here, the second bit image is an image with a higher bit number than the first bit image.

According to one embodiment of the present disclosure, the first output luminance information may include luminance information for each grayscale of the first bit image, and the second output luminance information may include luminance information for each grayscale of the second bit image.

The controlling step S1420 according to one embodiment of the present disclosure may include a step of driving a backlight block corresponding to pixels having a grayscale value lower than a first threshold grayscale among a plurality of pixels included in a first bit image based on second output brightness information, if the brightness information is lower than a threshold value.

Additionally, the controlling step S1420 may include a step of driving a backlight block corresponding to pixels having a grayscale value higher than a first threshold grayscale among a plurality of pixels included in the first bit image based on the first output luminance information.

An electronic device according to an embodiment of the present disclosure further includes third output luminance information corresponding to a third bit image, and the controlling step S1420 may include, if the luminance information is less than a threshold value, a step of driving a backlight block corresponding to pixels having a grayscale value greater than or equal to a first threshold grayscale and less than a second threshold grayscale, based on the first output luminance information, and a step of driving a backlight block corresponding to pixels having a grayscale value greater than or equal to the second threshold grayscale, based on the third output luminance information. Here, the third bit image may be an image having a smaller number of bits than the first bit image.

The controlling step S1420 according to one embodiment of the present disclosure may include the steps of identifying a first bit image as an area corresponding to each of a plurality of backlight blocks, the step of identifying a backlight block corresponding to pixels having a grayscale value lower than a first threshold grayscale based on an average grayscale value of each of the identified areas, and the step of driving the identified backlight block based on second output luminance information.

The controlling step S1420 according to one embodiment of the present disclosure may include a step of driving at least one backlight block adjacent to the identified backlight block based on second output luminance information.

The identifying step S1420 according to one embodiment of the present disclosure may include a step of obtaining brightness information based on at least one of an average picture level (APL) of the first bit image or a grayscale histogram of the first bit image.

Here, the identifying step S1420 may include a step of identifying whether brightness information is below a threshold value by applying different weights to each of an average picture level (APL) and a grayscale histogram of the first bit image.

Additionally, the first bit image may be a 10-bit image, and the first output luminance information may include output luminance information of each of 1024 grayscale levels, and the second bit image may be an 11-bit image, and the second output luminance information may include output luminance information of each of 2048 grayscale levels.

However, it goes without saying that the various embodiments of the present disclosure can be applied not only to electronic devices, but also to all electronic devices capable of image processing, such as image receiving devices such as set-top boxes and image processing devices.

Meanwhile, the various embodiments described above may be implemented in a recording medium that can be read by a computer or a similar device using software, hardware, or a combination thereof. In some cases, the embodiments described in this specification may be implemented by the processor (120) itself. According to a software implementation, embodiments such as the procedures and functions described in this specification may be implemented as separate software modules. Each of the software modules may perform one or more functions and operations described in this specification.

Meanwhile, computer instructions for performing processing operations of the audio output device (100) according to various embodiments of the present disclosure described above may be stored in a non-transitory computer-readable medium. When the computer instructions stored in the non-transitory computer-readable medium are executed by a processor of a specific device, they cause the specific device to perform processing operations in the audio output device (100) according to various embodiments described above.

A non-transitory computer-readable medium is not a medium that stores data for a short period of time, such as a register, cache, or memory, but a medium that permanently stores data and can be read by a device. Specific examples of non-transitory computer-readable media include CDs, DVDs, hard disks, Blu-ray disks, USBs, memory cards, and ROMs.

Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present disclosure pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be individually understood from the technical idea or prospect of the present disclosure.

110: Display panel 120: Backlight unit
130: Processor 140: Memory

Claims (19)

A memory storing first output luminance information corresponding to a first bit image and second output luminance information corresponding to a second bit image;
display panel;
A back light comprising a plurality of backlight blocks providing light to the display panel;
A driver for individually driving each of the above backlight blocks;
Based on the first bit image, brightness information of the received first bit image is identified,
If the brightness information is less than a threshold value, a processor for controlling the driver of at least one backlight block among the plurality of backlight blocks based on the second output brightness information;
The above first output luminance information includes luminance information for each grayscale of the first bit image,
The above second output luminance information includes luminance information for each grayscale of the second bit image,
The above processor,
If the brightness information is less than the threshold value, the backlight block corresponding to pixels having a grayscale value less than the first threshold grayscale among the plurality of pixels included in the first bit image is driven based on the second output brightness information,
Identifying a plurality of areas of the first bit image corresponding to each of the plurality of backlight blocks,
Identifying a backlight block corresponding to pixels having a grayscale value lower than the first threshold grayscale based on the average grayscale value of each of the plurality of areas, and driving the identified backlight block based on the second output luminance information,
An electronic device, wherein the second bit image is an image having a higher bit number than the first bit image. delete In the first paragraph,
The above processor,
An electronic device that drives a backlight block corresponding to pixels having a grayscale value higher than the first threshold grayscale among a plurality of pixels included in the first bit image based on the first output luminance information. In the first paragraph,
The above memory is,
It additionally stores the third output luminance information corresponding to the third bit image,
The above processor,
If the brightness information is less than the threshold value, the backlight block corresponding to pixels having a grayscale value greater than or equal to the first threshold grayscale and less than or equal to the second threshold grayscale is driven based on the first output brightness information, and the backlight block corresponding to pixels having a grayscale value greater than or equal to the second threshold grayscale is driven based on the third output brightness information.
An electronic device, wherein the third bit image has a smaller number of bits than the first bit image. delete In the first paragraph,
The above processor,
An electronic device that drives at least one backlight block adjacent to the identified backlight block based on the second output luminance information. In the first paragraph,
The above processor,
An electronic device that obtains the brightness information based on at least one of an average picture level (APL) of the first bit image or a grayscale histogram of the first bit image. In Article 7,
The above processor,
An electronic device that applies different weights to the average picture level (APL) of the first bit image and the grayscale histogram, respectively, to identify whether the brightness information is below the threshold value. In the first paragraph,
The above first bit image is a 10 bit image,
The above first output luminance information includes output luminance information for each of 1024 grayscale levels,
The above second bit image is an 11-bit image,
An electronic device, wherein the second output luminance information includes output luminance information of each of 2048 grayscale levels. A method for controlling an electronic device including first output luminance information corresponding to a first bit image and second output luminance information corresponding to a second bit image,
A step of identifying brightness information of the received first bit image based on the first bit image; and
If the brightness information is less than a threshold value, a step of controlling at least one backlight block among a plurality of backlight blocks included in a backlight that provides light to the display panel based on the second output brightness information is included;
The above first output luminance information includes luminance information for each grayscale of the first bit image,
The above second output luminance information includes luminance information for each grayscale of the second bit image,
The above controlling step is,
If the brightness information is less than the threshold value, a step of driving a backlight block corresponding to pixels having a grayscale value less than the first threshold grayscale among a plurality of pixels included in the first bit image based on the second output brightness information;
A step of identifying a plurality of areas of the first bit image, each corresponding to a plurality of backlight blocks;
A step of identifying a backlight block corresponding to pixels having a grayscale value lower than the first threshold grayscale based on an average grayscale value of each of the plurality of regions; and
A step of driving the identified backlight block based on the second output brightness information;
A control method, wherein the second bit image is an image having a higher bit number than the first bit image. delete In Article 10,
The above controlling step is,
A control method, comprising: a step of driving a backlight block corresponding to pixels having a grayscale value higher than the first threshold grayscale among a plurality of pixels included in the first bit image, based on the first output brightness information. In Article 10,
The electronic device further includes third output luminance information corresponding to the third bit image,
The above controlling step is,
If the brightness information is less than the threshold value, a step of driving a backlight block corresponding to pixels having a grayscale value greater than or equal to the first threshold grayscale and less than the second threshold grayscale based on the first output brightness information;
A step of driving a backlight block corresponding to pixels having a grayscale value higher than the second threshold grayscale based on the third output luminance information;
A control method, wherein the third bit image is an image having a smaller number of bits than the first bit image. delete In Article 10,
The above controlling step is,
A control method, comprising: a step of driving at least one backlight block adjacent to the identified backlight block based on the second output brightness information. In Article 10,
The above identifying step is,
A control method, comprising: a step of obtaining the brightness information based on at least one of an average picture level (APL) of the first bit image or a grayscale histogram of the first bit image. In Article 16,
The above identifying step is,
A control method, comprising: a step of applying different weights to each of the average picture level (APL) of the first bit image and the grayscale histogram to identify whether the brightness information is less than the threshold value; In Article 10,
The above first bit image is a 10 bit image,
The above first output luminance information includes output luminance information for each of 1024 grayscale levels,
The above second bit image is an 11-bit image,
A control method, wherein the second output luminance information includes output luminance information of each of 2048 grayscale levels. A non-transitory computer-readable medium storing computer instructions that, when executed by a processor of an electronic device, cause the electronic device to perform an operation, the operation comprising:
A step of identifying brightness information of the received first bit image based on the first bit image; and
If the brightness information is less than a threshold value, a step of controlling at least one backlight block among a plurality of backlight blocks included in a backlight that provides light to the display panel based on second output brightness information corresponding to the second bit image is included;
The first output luminance information includes luminance information for each grayscale of the first bit image,
The above second output luminance information includes luminance information for each grayscale of the second bit image,
The above controlling step is,
If the brightness information is less than the threshold value, a step of driving a backlight block corresponding to pixels having a grayscale value less than the first threshold grayscale among a plurality of pixels included in the first bit image based on the second output brightness information;
A step of identifying a plurality of areas of the first bit image, each corresponding to a plurality of backlight blocks;
A step of identifying a backlight block corresponding to pixels having a grayscale value lower than the first threshold grayscale based on an average grayscale value of each of the plurality of regions; and
A step of driving the identified backlight block based on the second output brightness information;
A non-transitory computer-readable medium, wherein the second bit image is an image having a higher bit number than the first bit image.

Images