Display device

Abstract

A display device is provided. The display device includes a display unit, a gamma voltage source, and a data driver, wherein the display unit includes a plurality of pixels arranged in a display area, the display area including a first area and a second area, the gamma voltage source includes gamma voltage generators configured to generate respective gamma voltage sets, and the data driver is configured to convert image data into data signals using the gamma voltage sets, supply the data signals to the pixels, generate data signals corresponding to the first and second areas by using a first group including some of the gamma voltage generators in a first mode, and generate data signals corresponding to the second area by using a second group including gamma voltage generators different from the first group in a second mode.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0115264, filed on September 19, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The technical field relates to a display device, and more particularly, to a driving chip, a display device including the driving chip, and a method of driving the display device. Background Art

[0004] The display device includes a display panel having pixels, scan lines connected to the pixels and transmitting scan signals, and data lines transmitting data voltages (data signals) to the pixels. In addition, the display device also includes a light sensor for fingerprint recognition or other biometric recognition, such as an infrared sensor.

[0005] Currently, technology is being developed to obtain biometric information by installing light sensors on the display area. The light sensors sense light emitted from pixels and reflected from the user, and based on the sensing results, generate signals required by electronic devices including the display device. The sensitivity and accuracy of the light sensors can vary depending on the intensity of the light incident on them.

[0006] The intensity (or brightness) of light output from a pixel may be determined by a data voltage (eg, a gamma voltage or a grayscale voltage). There is a need to improve the sensing sensitivity and accuracy of a light sensor overlapping a display area. Summary of the Invention

[0007] An object of the present disclosure is to provide a display device including a data driver that controls brightness of a display area that overlaps a light sensor, different from another display area.

[0008] Another object of the present disclosure is to provide a driver chip including a data driver.

[0009] Yet another object of the present disclosure is to provide a method for driving a display device.

[0010] However, the objects of the present disclosure are not limited to the above objects, and various extensions can be made within a certain range without departing from the spirit and scope of the present disclosure.

[0011] To achieve the purpose of the present disclosure, a display device according to an embodiment of the present disclosure may include a display unit, a gamma voltage source, and a data driver, wherein the display unit includes a plurality of pixels arranged in a display area, the display area includes a first area and a second area, the gamma voltage source includes a plurality of gamma voltage generators configured to generate respective gamma voltage sets, and the data driver is configured to convert image data into data signals by using the plurality of gamma voltage sets and to supply the data signals to the plurality of pixels, the data driver generates data signals corresponding to the first area and the second area by using a first group including some of the plurality of gamma voltage generators in a first mode, and generates data signals corresponding to the second area by using a second group including gamma voltage generators different from the first group in a second mode.

[0012] According to an embodiment, the data driver may generate a data signal corresponding to the first area by using the first group in the second mode. According to an embodiment, the display device may further include a light sensor, a memory, and a controller, wherein the light sensor overlaps with the second area and is arranged on an opposite side of the display surface of the display unit, the memory is configured to store gamma selection data defining the second area and output the gamma selection data to the data driver in response to activation of the light sensor, and the controller is configured to supply image data to the data driver and control the memory in response to activation of the light sensor.

[0013] According to an embodiment, the gamma voltage source may include a first gamma voltage generator, a second gamma voltage generator, a third gamma voltage generator and a first high-brightness gamma voltage generator, wherein the first gamma voltage generator is configured to generate a first gamma voltage set corresponding to the first color light from a plurality of gamma voltage sets, the second gamma voltage generator is configured to generate a second gamma voltage set corresponding to the second color light from a plurality of gamma voltage sets, the third gamma voltage generator is configured to generate a third gamma voltage set corresponding to the third color light from a plurality of gamma voltage sets, and the first high-brightness gamma voltage generator is configured to generate a first high-brightness gamma voltage set corresponding to at least one of the first to third color lights.

[0014] According to an embodiment, the first group may include a first gamma voltage generator, a second gamma voltage generator, and a third gamma voltage generator.

[0015] According to an embodiment, the second group includes two of the first gamma voltage generator, the second gamma voltage generator, and the third gamma voltage generator, and the first high-brightness gamma voltage generator.

[0016] According to an embodiment, the first color light, the second color light, and the third color light may be red light, blue light, and green light, respectively.

[0017] According to an embodiment, the first high-brightness gamma voltage set may correspond to green light and may be applied to the data driver in the second mode.

[0018] According to an embodiment, the second group includes a second gamma voltage generator, a third gamma voltage generator, and a first high-brightness gamma voltage generator.

[0019] According to an embodiment, the gamma voltage source may further include a second high-brightness gamma voltage generator, wherein the second high-brightness gamma voltage generator is configured to generate a second high-brightness gamma voltage set corresponding to blue light.

[0020] According to an embodiment, the second group may include a first gamma voltage generator, a first high-brightness gamma voltage generator, and a second high-brightness gamma voltage generator. According to an embodiment, the data driver may include a first latch, a second latch, and a digital-to-analog converter, wherein the first latch is configured to synchronously latch image data and synchronously output the image data in units of horizontal lines, the second latch is configured to receive gamma selection data from a memory in a second mode, synchronously latch the gamma selection data, and output the gamma selection data in units of horizontal lines, and the digital-to-analog converter is configured to convert the latched image data into a data signal based on the gamma selection data, the first gamma voltage set, the second gamma voltage set, the third gamma voltage set, and the first high-brightness gamma voltage set.

[0021] According to an embodiment, the digital-to-analog converter may be configured to select one of the first gamma voltage set and the first high-brightness gamma voltage set based on the gamma selection data in the second mode and output the data signal based on the selected one.

[0022] According to an embodiment, in the second mode, the digital-to-analog converter may convert the latched image data corresponding to the second area into a data signal by using the second group, and in the second mode, the digital-to-analog converter may convert the latched image data corresponding to the first area into a data signal by using the first group.

[0023] According to an embodiment, in the first mode, the digital-to-analog converter may convert the latched image data corresponding to the first and second regions into data signals by using the first group.

[0024] According to an embodiment, the light sensor may be deactivated in a first mode, and the light sensor may be activated in a second mode, and in the second mode the brightness of the second area may be higher than the brightness of the first area. To achieve the purpose of the present disclosure, a method of driving a display device according to an embodiment of the present disclosure may include: converting image data into a data signal by using a first gamma voltage set, a second gamma voltage set, and a third gamma voltage set in a first mode; displaying an image based on the data signal in the first mode; converting first image data corresponding to a first area of the display area into a first data signal by using the first gamma voltage set, the second gamma voltage set, and the third gamma voltage set in a second mode in which the light sensor arranged on the opposite side of the display surface is activated; converting second image data corresponding to a second area of the display area into a second data signal by using the first gamma voltage set, the second gamma voltage set, and a high-brightness gamma voltage set in the second mode; and displaying an image based on the first data signal and the second data signal in the second mode.

[0025] According to an embodiment, the third gamma voltage set and the high-brightness gamma voltage set may include gamma voltages for the same color light, and in a second mode, the brightness of the second area may be higher than that of the first area. To achieve the purpose of the present disclosure, a driver chip according to an embodiment of the present disclosure may include a gamma voltage source and a data driver, wherein the gamma voltage source includes gamma voltage generators that generate respective gamma voltage sets, and the data driver is configured to convert image data into data signals using the gamma voltage sets, wherein in the first mode, the data driver generates data signals corresponding to the first and second areas included in the display area using a first group including some of the gamma voltage generators, and in the second mode, the data driver generates data signals corresponding to the second area using a second group including gamma voltage generators different from the first group and generates data signals corresponding to the first area using the first group.

[0026] According to an embodiment, a gamma voltage source may include a first gamma voltage generator, a second gamma voltage generator, a third gamma voltage generator, and a first high-brightness gamma voltage generator. The first gamma voltage generator is configured to generate a first gamma voltage set corresponding to a first color of light from among a plurality of gamma voltage sets, the second gamma voltage generator is configured to generate a second gamma voltage set corresponding to a second color of light from among a plurality of gamma voltage sets, the third gamma voltage generator is configured to generate a third gamma voltage set corresponding to a third color of light from among a plurality of gamma voltage sets, and the first high-brightness gamma voltage generator is configured to generate a first high-brightness gamma voltage set corresponding to one of the first to third color lights. A first group may include the first gamma voltage generator, the second gamma voltage generator, and the third gamma voltage generator. A second group may include the first high-brightness gamma voltage generator and a gamma voltage generator from among the first, second, and third gamma voltage generators that does not correspond to a color of light from the first high-brightness gamma voltage set.

[0027] According to a display device and a method for driving the display device, the sensing sensitivity and accuracy of the light sensor can be improved by increasing the brightness of the second region corresponding to the light sensor in the second mode. Furthermore, the gamma parameters (e.g., gamma curve or gamma voltage) of the first region other than the second region are stably maintained in the second mode, allowing the first region to display a high-quality image. Consequently, the sensing performance of the light sensor can be improved, and image quality can be improved as well.

[0028] However, the effects of the present disclosure are not limited to the above-described effects, and various extensions can be made within a certain range without departing from the spirit and scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other features of the inventive concept will become more apparent by describing in further detail exemplary embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0030] Figure 1 is a block diagram illustrating a display device according to an embodiment of the present disclosure;

[0031] Figure 2A It is schematically shown Figure 1 A cross-sectional view of a display area of a display device;

[0032] Figure 2B It shows Figure 1 a plan view of a display area of a display device;

[0033] Figure 3 It is shown that the Figure 1 FIG. 1 is a diagram of a data driver and a gamma voltage source in a display device;

[0034] Figure 4 It is shown that the Figure 3 a diagram of a gamma voltage generator in a gamma voltage source;

[0035] Figure 5A It is shown by Figure 3 a diagram of a set of gamma voltages generated by a gamma voltage source;

[0036] Figure 5B It is shown by Figure 3 a diagram of a set of gamma voltages generated by a gamma voltage source;

[0037] Figure 6 is shown to be supplied to Figure 3 A data driver diagram of gamma selection data;

[0038] Figure 7 It shows Figure 3 a diagram of the operation of the data driver and the gamma voltage source in the second mode;

[0039] Figure 8 It shows Figure 3 a diagram of the operation of the data driver and the gamma voltage source in the second mode;

[0040] Figure 9A It shows that according to Figure 1 a diagram showing a brightness difference in a display area according to a driving mode of a display device;

[0041] Figure 9B is shown to be supplied to Figure 1 A graph showing a change in a data voltage of a display area of a display device;

[0042] Figure 10 It is shown that the Figure 1 FIG. 1 is a diagram of a data driver and a gamma voltage source in a display device;

[0043] Figure 11 It is shown by Figure 10 a graph of a set of gamma voltages generated by a gamma voltage source; and

[0044] Figure 12 is a flowchart illustrating a method of driving a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] Example embodiments are described with reference to the drawings, wherein like reference numerals may refer to like elements throughout.

[0046] Although the terms "first", "second", etc. may be used to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Without departing from the teachings of one or more embodiments, a first component may be referred to as a second component. The description of a component as a "first" component may not require or imply the existence of a second component or other components. The terms "first", "second", etc. may be used to distinguish different categories or groups of components. For the sake of brevity, the terms "first", "second", etc. may respectively represent "first type (or first group)", "second type (or second group)", etc.

[0047] The singular forms "a," "an," and "the" may include the plural forms as well, unless the context clearly indicates otherwise.

[0048] When a first element is referred to as being “on” a second element, the first element may be directly or indirectly located on the second element. One or more intervening elements may be present between the first and second elements.

[0049] The sizes of elements in the drawings may be exaggerated for convenience of explanation.

[0050] Figure 1 is a block diagram showing a display device 1000 according to an embodiment of the present disclosure, Figure 2A It is schematically shown Figure 1 A cross-sectional view of the display area DA of the display device 1000, and Figure 2B It shows Figure 1 FIG. 1 is a plan view of a display area DA of a display device 1000 .

[0051] Reference Figures 1 to 2B , the display device 1000 may include a display unit 100, a data driver 200, a gamma voltage source 300, a scan driver 400, and a controller 500. In an embodiment, the display device 1000 may further include a memory 600 and a light sensor 700.

[0052] The display device 1000 may be a self-luminous display device including a plurality of self-luminous elements. For example, the display device 1000 may be an organic light-emitting display device including organic light-emitting elements or a display device including inorganic light-emitting elements. The display device 1000 may be a liquid crystal display device, a plasma display device, a quantum dot display device, or the like.

[0053] The display device 1000 may be a flat panel display device, a flexible display device, a curved display device, a foldable display device, or a bendable display device. In addition, the display device may be part of a transparent display device, a head-mounted display device, a wearable display device, or the like.

[0054] The display unit 100 may include a plurality of scan lines SL1 to SLn, a plurality of data lines DL1 to DLm, and a plurality of pixels P (where n and m are integers greater than 1) connected to the respective scan lines SL1 to SLn and the respective data lines DL1 to DLm. The pixel P may include a plurality of sub-pixels. For example, each of the plurality of sub-pixels may emit light of one color among red, blue, and green. The sub-pixels may also emit light of one color among cyan, magenta, yellow, and white. Hereinafter, for convenience of description, a pixel P refers to a sub-pixel.

[0055] The display unit 100 may define a display area DA including a first area DA1 and a second area DA2 , and the pixels P are included in the display area DA. In addition, the display unit 100 may be formed in a display panel DP.

[0056] In an embodiment, the second area DA2 may partially or entirely overlap the area where the light sensor 700 is arranged. The first area DA1 includes the entire display area DA except the second area DA2. Figure 2B As shown in , the second area DA2 may be formed in a circular or elliptical shape in a portion of the display area DA. The shape and area of the second area DA2 may vary corresponding to the position of the light sensor 700 and the size and shape of the area where the light sensor 700 is arranged.

[0057] In an embodiment, the display unit 100 can be driven in a first mode or a second mode. The first mode can be defined as a mode for displaying a normal image, and the second mode can be defined as a mode in which the light sensor 700 is activated. For example, in the second mode, the light sensor 700 can perform a light sensing operation and can perform fingerprint recognition, iris recognition, or the like.

[0058] Optical sensor 700 may be an optical sensor that senses biometric information, such as a user's fingerprint. For example, optical sensor 700 may sense biometric information using infrared light, visible light, and the like, and may function as a biometric sensor, such as a fingerprint sensor, an iris recognition sensor, and an artery sensor. Optical sensor 700 may also function as a proximity sensor, such as a motion sensor or a gesture sensor. Optical sensor 700 may be an ultrasonic sensor.

[0059] The sensing sensitivity and accuracy of the light sensor 700 may vary according to the intensity of light incident on the light sensor 700. For example, the greater the intensity of light incident on the light sensor 700 (i.e., the higher the brightness), the better the sensing sensitivity and accuracy of the light sensor 700. Therefore, in the second mode, as the brightness of the second area DA2 increases, the sensing accuracy of the light sensor 700 may increase.

[0060] When the driving transistor of the pixel P is a PMOS (P-channel metal-oxide semiconductor) transistor, in order to increase the brightness of the second area DA2, the gamma voltage corresponding to the grayscale value of the image data DATA needs to be reduced. With respect to the entire display area DA, the existing data driver uses the same gamma curve (or gamma set) for each pixel P having the same color. Therefore, when the brightness is increased to improve the performance of the light sensor 700, the brightness in the first area DA1 is also increased, and thus the gamma value (e.g., the gamma voltage of the corresponding grayscale) is undesirably changed. Therefore, in the second mode, the color of the image is changed and the image quality is degraded.

[0061] In order to improve image quality, the display unit 100 should be driven to increase the brightness of only the second area DA2 while maintaining the gamma value of the first area DA1 equal to that of the first mode in the second mode.

[0062] The display device 1000 according to an embodiment of the present disclosure may include the gamma voltage source 300 and the data driver 200 having configurations for achieving the above purpose. Therefore, when the light sensor 700 is activated, the second area DA2 may display an image with a brightness higher than that of the first area DA1.

[0063] The controller 500 may generate a first control signal SCS, a second control signal DCS, and a third control signal GCS in response to an externally supplied synchronization signal. The first control signal SCS may be supplied to the scan driver 400, the second control signal DCS may be supplied to the data driver 200, and the third control signal GCS may be supplied to the gamma voltage source 300. Furthermore, the controller 500 may rearrange externally supplied input image data into image data DATA and supply the image data DATA to the data driver 200. In embodiments, the controller 500 may include a timing controller function for controlling the driving of the scan driver 400, the data driver 200, and the like.

[0064] The controller 500 may control activation of the light sensor 700 in correspondence with driving of the display unit 100, and control operations of the memory 600, the gamma voltage source 300, or the like in correspondence with driving of the light sensor 700. In an embodiment, the controller 500 may supply a read signal RS to the memory 600 to control operations of the memory 600 in correspondence with activation of the light sensor 700. The read signal RS may be output only in the second mode.

[0065] The first control signal SCS may include a scan start pulse and a clock signal. The scan start pulse may control the first timing of the scan signal. The clock signal may be used to shift the scan start pulse.

[0066] The second control signal DCS may include a source start pulse and a clock signal. The source start pulse controls the start time point of data sampling. The clock signal is used to control the sampling operation.

[0067] The third control signal GCS may be used to determine a set of gamma voltages applied to a gamma voltage generator included in the gamma voltage source 300 .

[0068] The scan driver 400 may receive a first control signal SCS from the controller 500 and may supply scan signals to the scan lines SL1 to SLn based on the first control signal SCS. For example, the scan driver 400 may sequentially supply scan signals to the scan lines SL1 to SLn. When the scan signals are sequentially supplied, the pixels P may be selected in units of horizontal lines (or pixel rows).

[0069] In an embodiment, the scan driver 400 may be an integrated circuit (IC) formed on the display panel DP in the form of a tape carrier package and connected to the display panel DP.

[0070] The gamma voltage source 300 can generate gamma voltages GV (e.g., grayscale voltages) corresponding to grayscale. The gamma voltages GV can be supplied to the data driver 200. The gamma voltages GV are generated from a gamma voltage set, and the gamma voltage source 300 can include multiple gamma voltage generators, each of which generates a separate gamma voltage set. For example, the multiple gamma voltage sets can correspond to multiple pixels P that emit light of different colors. For example, when the multiple pixels P include red pixels, blue pixels, and green pixels, the multiple gamma voltage generators can include a first gamma voltage generator that generates a first gamma voltage set corresponding to the red pixels, a second gamma voltage generator that generates a second gamma voltage set corresponding to the blue pixels, and a third gamma voltage generator that generates a third gamma voltage set corresponding to the green pixels.

[0071] In an embodiment, the gamma voltage source 300 may further include a high-brightness gamma voltage generator that is activated in the second mode. For example, the high-brightness gamma voltage generator may generate a set of high-brightness gamma voltages for some pixels P included in the second area DA2 in the second mode. Therefore, a portion of the image data DATA corresponding to the second area DA2 may be converted into an analog data signal based on the set of high-brightness gamma voltages.

[0072] For example, a high-brightness gamma voltage generator may replace the third gamma voltage generator for the second area DA2. That is, data signals (grayscale voltages) based on the high-brightness gamma voltage set may be supplied to the green pixels included in the second area DA2. Data signals based on the third gamma voltage set may be supplied to the first area DA1, excluding the second area DA2. That is, in the second mode, and with respect to the green pixels, different gamma voltage sets (i.e., the third gamma voltage set and the high-brightness gamma voltage set) may be used in the second area DA2 and the first area DA1.

[0073] The data driver 200 may receive a second control signal DCS and image data DATA from the controller 500. The data driver 200 may supply data signals to the plurality of data lines DL1 to DLm in response to the second control signal DCS. The data signals supplied to the plurality of data lines DL1 to DLm may be supplied to pixels P selected by a scan signal. To this end, the data driver 200 may supply data signals to the plurality of data lines DL1 to DLm in synchronization with the scan signal.

[0074] In an embodiment, the data driver 200 may convert the image data DATA into data signals by using a set of gamma voltages generated by the gamma voltage source 300, and may supply the data signals to the pixels P through the plurality of data lines DL1 to DLm. For example, the data driver 200 may select and output data signals (data voltages) corresponding to grayscale values of the image data DATA.

[0075] The data driver 200 may generate data signals corresponding to the first and second areas DA1 and DA2 in the first mode by using a first group including some of the plurality of gamma voltage generators. For example, the first group may be first to third gamma voltage generators.

[0076] In the second mode, the data driver 200 can generate data signals corresponding to the second area DA2 by using a second group different from the first group. The data signal corresponding to the first area DA1 can be generated based on the gamma voltage set of the first group. The second group can include a first gamma voltage generator, a second gamma voltage generator, and a high-brightness gamma voltage generator. In the second mode, the brightness of the first area DA1 and the second area DA2 can be different from each other.

[0077] Meanwhile, at least one of the data driver 200, the gamma voltage source 300, and the controller 500 may be formed in the display unit 100 (or Figure 2A The data driver 200, the gamma voltage source 300 and the controller 500 may be integrated into one driver chip. Figure 1 As shown in FIG, the data driver 200 , the gamma voltage source 300 , and the controller 500 may be included in one driving chip 10 .

[0078] In an embodiment, the display device 1000 may further include a light emitting driver that supplies a light emitting control signal to the pixel P and a power supply that supplies a predetermined power supply voltage to the pixel P.

[0079] The memory 600 may store gamma selection data GSD defining the second area DA2. In embodiments, the gamma selection data GSD may include a 1-bit data value corresponding to each pixel P. For example, the gamma selection data GSD may include a first value corresponding to the first area DA1 or a second value corresponding to the second area DA2. In embodiments, the memory 600 may be a nonvolatile memory such as a flash memory or a read-only memory (ROM).

[0080] The memory 600 may supply gamma selection data GSD to the data driver 200 in response to the read signal RS supplied from the controller 500. The data driver 200 may determine whether to use the third gamma voltage set or the high-brightness gamma voltage set for each pixel P based on the gamma selection data GSD.

[0081] In an embodiment, the memory 600 may include a plurality of sets of gamma selection data GSD corresponding to various second areas DA2, respectively. In this case, a set of gamma selection data corresponding to (e.g., matching) the position or shape of the second area DA2 may be adaptively selected and supplied to the data driver 200.

[0082] At the same time, if Figure 2A As shown in FIG, the touch sensor TS may be arranged on the display panel DP. The touch sensor TS may be driven by a capacitive method or a resistive film method. The touch sensor TS may sense not only a touched position but also a touched intensity.

[0083] In an embodiment, the touch sensor TS may be a touch panel attached to the display panel DP through a transparent adhesive member, or may be directly disposed on the display panel DP. In an embodiment, the touch sensor TS may be built in the display panel DP.

[0084] A window cover WC made of a transparent material may be disposed on the touch sensor TS. The window cover WC may be disposed on the outermost side of the front surface (i.e., the display surface) of the display device 1000 and may protect components within the display device 1000 from external impacts, scratches, and the like. The window cover WC may be a glass material or formed from a polymer film. For example, the window cover WC may include at least one of polyimide, polyethylene terephthalate (PET), and another polymer material.

[0085] In an embodiment, a main board MB that controls the electronic device including the display apparatus 1000 may be disposed under the light sensor 700. Each of the light sensor 700 and the display panel DP may be electrically connected to the main board MB.

[0086] The display device 1000 according to an embodiment of the present disclosure may increase the brightness of only the second area DA2 in the second mode, and may maintain the gamma value of the first area DA1 equal to that of the first mode.

[0087] Figure 3 It is shown that the Figure 1 FIG. 1 is a diagram of a data driver 200 and a gamma voltage source 300 in a display device 1000, and Figure 4 It is shown that the Figure 3 FIG. 1 is a diagram of a gamma voltage generator 30 in a gamma voltage source 300 .

[0088] Reference Figure 1 、 Figure 3 and Figure 4 , the data driver 200 and the gamma voltage source 300 may be included in the driving chip 10 .

[0089] In the first mode, the data driver 200 may generate data signals for the first area DA1 and the second area DA2 by using the gamma voltage generators of the first group GR1. In the second mode, the data driver 200 may generate data signals for the second area DA2 by using the gamma voltage generators of the second group GR2, and may generate data signals for the first area DA1 by using the gamma voltage generators of the first group GR1.

[0090] In an implementation, the data driver 200 may include a shift register 210 , a first latch 220 , a second latch 230 , a digital-to-analog converter 240 , and an output buffer 250 .

[0091] The shift register 210 may control the timing at which the image data DATA is sequentially stored in the first latch 220. For example, the shift register 210 may include a Figure 1 The number of the plurality of data lines DL1 to DLm corresponds to m shift circuits.

[0092] The shift register 210 may receive a horizontal start signal STH and a data clock signal DCLK from the controller 500. The shift register 210 may generate a shifted clock signal, for example, a plurality of latch clock signals CK1 to CKm, by shifting the horizontal start signal STH in synchronization with the data clock signal DCLK. The shift register 210 may provide the plurality of latch clock signals CK1 to CKm to the first latch 220.

[0093] The first latch 220 can latch image data DATA and synchronously output the data in units of horizontal lines. The first latch 220 may have m latch circuits. In an embodiment, the first latch 220 can sequentially store the image data DATA corresponding to one horizontal line from one end to the other of the latch circuit based on multiple latch clock signals CK1 to CKm. When the storage of the image data DATA is completed, the first latch 220 can output the latched plurality of image data DT1 to DTm in units of horizontal lines in response to the load signal. The latched plurality of image data DT1 to DTm corresponding to one horizontal line can be N-bit data (for example, N can be 8).

[0094] In an embodiment, the first latch 220 may include a sampling latch and a holding latch. For example, the first latch 220 may include m sampling latches each storing m digital image data DATA. Each sampling latch has a storage capacity corresponding to the number of bits of the image data DATA and may sequentially store the image data DATA in response to a sampling signal.

[0095] The m holding latches may synchronously receive the latched plurality of image data DT1 to DTm from the sampling latch and store the latched plurality of image data DT1 to DTm, and may synchronously supply the latched plurality of image data DT1 to DTm stored in a previous period to a digital-analog converter (DAC) 240.

[0096] The second latch 230 can receive gamma selection data GSD from the memory 600 in the second mode. The second latch 230 can latch the gamma selection data GSD and output the gamma selection data GSD in units of horizontal lines. The second latch 230 can also include m sampling latches and m holding latches. That is, the second latch 230 is the same as a 1-bit line memory.

[0097] In an embodiment, the gamma selection data GSD may include a 1-bit data value corresponding to each pixel P, and each of the plurality of sampling latches included in the second latch 230 may have a storage capacity corresponding to 1 bit. In addition, the operation of the second latch 230 may be performed at substantially the same timing as the first latch 220. Therefore, the second latch 230 may sequentially supply the latched plurality of gamma selection data GS1 to GSm to the digital-to-analog converter 240 in units of horizontal lines.

[0098] In an embodiment, in the first mode, disable data may be supplied from the controller 500 to the second latch 230. In this case, the second latch 230 may not be operated, and the electrical connection between the high brightness gamma voltage generator 350 and the digital-to-analog converter 240 may be disconnected.

[0099] The D / A converter 240 may convert the latched image data DT1 to DTm into analog data signals Y1 to Ym based on the gamma voltage GV and the latched gamma selection data GS1 to GSm. The analog data signals Y1 to Ym may be supplied to the output buffer 250 .

[0100] The output buffer 250 may output the plurality of data signals Y1 to Ym output from the digital-to-analog converter 240 to the data lines DL1 to DLm. For example, the output buffer 250 may output the plurality of data signals Y1 to Ym corresponding to corresponding pixel rows to the data lines DL1 to DLm in response to a predetermined clock signal CLK.

[0101] The gamma voltage source 300 may include a plurality of gamma voltage generators 320, 330, 340, and 350 that respectively generate a plurality of gamma voltage sets RG, BG, GG, and HLG. Furthermore, the gamma voltage source 300 may further include first to fourth registers 360 to 390 and a resistor string 310 that divides a first voltage VH and a second voltage VL.

[0102] The gamma voltage source 300 may generate the gamma voltages GV by using a plurality of gamma voltage generators 320, 330, 340, and 350. For example, the gamma voltages GV may be determined based on a preset gamma curve (eg, a 2.2 gamma curve or the like).

[0103] The first gamma voltage generator 320 may generate a first gamma voltage set RG corresponding to the first color light based on data received from the first register 360. The first register 360 may include multiple gamma voltage sets corresponding to multiple gamma curves for the first color light. A gamma curve for the first color light corresponding to predetermined image data DATA may be selected, and the first register 360 may provide data including information about the corresponding gamma curve to the first gamma voltage generator 320. The first gamma voltage generator 320 may generate a first gamma voltage set RG including multiple gamma voltages based on the data including information about the corresponding gamma curve. For example, the first color light may be red light, and the first gamma voltage set RG may include 8-bit (256) red gamma voltages. Since the configuration and operation of the second gamma voltage generator 330, the third gamma voltage generator 340, and the high-brightness gamma voltage generator 350 are similar to those of the first gamma voltage generator 320, repeated descriptions will be omitted.

[0104] The second gamma voltage generator 330 may generate a second gamma voltage set BG corresponding to one of the plurality of gamma curves stored in the second register 370. The second gamma voltage set BG may correspond to the second color light. For example, the second color light may be blue light, and the second gamma voltage set BG may include 8-bit (256) blue gamma voltages.

[0105] The third gamma voltage generator 340 may generate a third gamma voltage set GG corresponding to one of the plurality of gamma curves stored in the third register 380. The third gamma voltage set GG may correspond to a third color light. For example, the third color light may be green light, and the third gamma voltage set GG may include 8-bit (256) green gamma voltages.

[0106] According to an embodiment, the gamma voltage source 300 may further include a gamma voltage generator and / or a gamma voltage set for generating a gamma voltage GV for white light.

[0107] The high brightness gamma voltage generator 350 may generate a high brightness gamma voltage set HLG corresponding to one of a plurality of gamma curves stored in the fourth register 390. The high brightness gamma voltage set HLG may correspond to one of the first to third color lights.

[0108] In an embodiment, the high brightness gamma voltage set HLG may correspond to the third color light, which is green light. In the second mode, with respect to the second area DA2, the high brightness gamma voltage generator 350 may provide the high brightness gamma voltage set HLG to the DAC 240 instead of the third gamma voltage generator 340.

[0109] An increase in the brightness of the red grayscale may cause a failure of the light sensor 700 to sense infrared light. In addition, an increase in the brightness of the blue grayscale of the blue pixel having the fastest degradation rate may adversely affect the degradation and service life of the display device 1000. Therefore, the brightness of the green pixel in the second mode may be increased to increase the brightness of the second area DA2. In an embodiment, the high brightness gamma voltage set HLG may include a gamma voltage (or gamma voltage information) for white light. In addition, depending on the display device applied, the high brightness gamma voltage set HLG may include a gamma voltage for blue light or a gamma voltage for red light.

[0110] In an embodiment, the first group GR1 may include first, second, and third gamma voltage generators 320 , 330 , and 340 , and the second group GR2 may include first, second, and high-brightness gamma voltage generators 350 .

[0111] In the first mode, data signals may be generated by first, second, and third gamma voltage sets RG, BG, and GG generated for the entire display area DA by the first, second, and third gamma voltage generators 320, 330, and 340.

[0112] In the second mode, data signals corresponding to the first area DA1 may be generated by the first gamma voltage set RG, the second gamma voltage set BG, and the third gamma voltage set GG generated by the first gamma voltage generator 320, the second gamma voltage generator 330, and the third gamma voltage generator 340. With respect to the second area DA2, data signals corresponding to the plurality of gamma voltage sets RG, BG, and HLG may be generated by the first gamma voltage generator 320, the second gamma voltage generator 330, and the high-brightness gamma voltage generator 350.

[0113] In an embodiment, each of the plurality of gamma voltage generators 320 to 350 may be Figure 4 For example, Figure 4 A gamma voltage generator 30 is shown.

[0114] The gamma voltage generator 30 may include a maximum-minimum selection circuit 31 , an intermediate gamma selection circuit 32 , and a gamma output circuit 33 . Figure 4 It is shown that the gamma voltage generator 30 generates 256 gamma voltages V0 to V255.

[0115] The maximum-minimum selection circuit 31 may include a first resistor string RS1, a first selector M1, a second selector M2, a first buffer B1, and a second buffer B2. The first resistor string RS1 may divide a first voltage VH and a second voltage VL to generate a plurality of voltages. In this case, the first voltage VH may be higher than the second voltage VL, and the second voltage VL may be, for example, a ground voltage. Multiple voltages between the first voltage VH and the second voltage VL may be output via the first resistor string RS1, and the first selector M1 may select one of the plurality of voltages as the maximum intermediate gamma voltage VG0 based on a maximum selection signal CSH. The selected maximum intermediate gamma voltage VG0 may be output via the first buffer B1.

[0116] A voltage level of at least one of the first voltage VH and the second voltage VL may be changed according to a selected gamma curve.

[0117] The second selector M2 may select one of the plurality of voltages as the minimum intermediate gamma voltage VG7 based on the minimum selection signal CSL. The selected minimum intermediate gamma voltage VG7 may be output through the second buffer B2.

[0118] The intermediate gamma selection circuit 32 may generate a plurality of intermediate gamma voltages VG1 to VG6 based on the maximum intermediate gamma voltage VG0 and the minimum intermediate gamma voltage VG7 .

[0119] The intermediate gamma selection circuit 32 may include a plurality of second resistor strings RS2 and a plurality of selectors M3 to M8. The intermediate gamma selection circuit 32 may select a respective voltage from among the plurality of voltages generated by voltage division in the plurality of second resistor strings RS2 based on first to sixth selection signals CS1 to CS6, and may output the selected voltage as one of a plurality of intermediate gamma voltages VG1 to VG6. The intermediate gamma selection circuit 32 may also include a plurality of buffers B3 to B8. The plurality of intermediate gamma voltages VG1 to VG6 may be output via the plurality of buffers B3 to B8.

[0120] The gamma output circuit 33 may include a third resistor string RS3. By using the third resistor string RS3, the gamma output circuit 33 may generate a plurality of gamma voltages V0 to V255 by performing voltage division among a plurality of intermediate gamma voltages VG0 to VG7.

[0121] according to Figure 4 With the circuit configuration of FIG. 3 , the plurality of gamma voltage generators 320 to 350 may generate a plurality of gamma voltage sets RG, BG, GG, and HLG.

[0122] Figure 5A and Figure 5B It is shown by Figure 3FIG. 1 is a diagram of a plurality of gamma voltage sets RG, BG, GG, and HLG generated by the gamma voltage source 300 .

[0123] Reference Figure 1 、 Figure 3 、 Figure 5A and Figure 5B , the plurality of gamma voltage sets RG, BG, GG, and HLG may correspond to a plurality of predetermined gamma curves GC1, GC2, GC3, and HLGC, respectively.

[0124] Figure 5A and Figure 5B 1 shows a gamma voltage GV according to a grayscale value GS when the driving transistor included in the pixel P is a PMOS transistor. In an embodiment, when the image data DATA is represented by a grayscale value of 0G to a grayscale value of 255G, the gamma voltage GV may decrease as the grayscale value GS increases. In an embodiment, when the driving transistor is an NMOS transistor, the gamma voltage GV may increase as the grayscale value GS increases.

[0125] The first gamma voltage set RG corresponding to the red pixel may correspond to the first gamma curve GC1, the second gamma voltage set BG corresponding to the blue pixel may correspond to the second gamma curve GC2, and the third gamma voltage set GG corresponding to the green pixel may correspond to the third gamma curve GC3.

[0126] The high brightness gamma voltage set HLG corresponding to the green pixel may correspond to the fourth gamma curve HLGC. Therefore, for the same grayscale value, the brightness of the green pixel applied with the high brightness gamma voltage set HLG may be higher than the brightness of the green pixel applied with the third gamma voltage set GG.

[0127] In an embodiment, Figure 5B As shown in FIG, the fourth gamma curve HLGC may have a constant gamma voltage GV regardless of the grayscale value GS. For example, a pixel P receiving a data signal converted based on the fourth gamma curve HLGC may emit light at maximum brightness regardless of the grayscale value GS. Since the second area DA2 is covered by a finger or the like for fingerprint recognition, the image quality of the second area DA2 in the second mode is not a big problem. In addition, light sensing sensitivity and accuracy can be improved by Figure 5B The fourth gamma curve HLGC is used to further improve it.

[0128] Figure 6 is shown to be supplied to Figure 3 FIG. 1 is a diagram of the gamma selection data GSD of the data driver 200.

[0129] Reference Figure 1 、 Figure 3 and Figure 6, the gamma selection data GSD may have a 1-bit value corresponding to each of all pixels P of the display area DA. For example, a first value (e.g., digital value 0) of the gamma selection data GSD may correspond to the pixel P of the first area DA1, and a second value (e.g., digital value 1) may correspond to the pixel P of the second area DA2.

[0130] All bits in the gamma selection data GSD corresponding to the plurality of pixels P included in the first pixel row PXL1 may have a first value. Some of the plurality of pixels P of the second pixel row PXL2 may correspond to the second area DA2. Some bits in the gamma selection data GSD of the second pixel row PXL2 corresponding to the second area DA2 may have a second value.

[0131] In an embodiment, gamma selection data GSD may be stored in memory 600 and supplied to second latch 230 of data driver 200 in response to read signal RS in the second mode. The second mode may be a driving mode to activate photosensor 700 for fingerprint recognition or the like.

[0132] In the first mode, the gamma selection data GSD may not be supplied to the second latch 230 , or only the gamma selection data GSD having the first value may be supplied to the second latch 230 .

[0133] Figure 7 and Figure 8 It shows Figure 3 FIG. 1 is a diagram illustrating an example of operations of the data driver 200 and the gamma voltage source 300 in the second mode.

[0134] Reference Figure 3 、 Figure 7 and Figure 8 , the gamma selection data GSD supplied to the plurality of data lines (eg, the plurality of data lines DL1 to DL3 ) passing through the second area DA2 along pixel rows (or horizontal lines) may be changed.

[0135] In an embodiment, the first data line DL1 may be connected to a first pixel (eg, a red pixel), the second data line DL2 may be connected to a second pixel (eg, a blue pixel), and the third data line DL3 may be connected to a third pixel (eg, a green pixel).

[0136] As reference Figure 7As described above, the first latch 220 may include a plurality of sampling latches 221-1 to 221-3 corresponding to the plurality of data lines DL1 to DL3, and a plurality of holding latches 222-1 to 222-3 corresponding to the plurality of data lines DL1 to DL3, respectively. Each of the plurality of sampling latches 221-1 to 221-3 may sequentially store 8-bit image data. The plurality of holding latches 222-1 to 222-3 may store the image data latched in the plurality of sampling latches 221-1 to 221-3 in units of horizontal periods and then output the image data to the digital-to-analog converter 240.

[0137] The second latch 230 may include a plurality of sampling latches 231-1 to 231-3 corresponding to the plurality of data lines DL1 to DL3, and a plurality of holding latches 232-1 to 232-3 corresponding to the plurality of data lines DL1 to DL3. Each of the plurality of sampling latches 231-1 to 231-3 may sequentially store 1 bit of gamma selection data GSD. The plurality of holding latches 232-1 to 232-3 may store the gamma selection data GSD latched in the plurality of sampling latches 231-1 to 231-3 in units of horizontal periods and then output the gamma selection data GSD to the digital-to-analog converter 240.

[0138] The digital-to-analog converter 240 may include a plurality of converters 241 to 243 corresponding to the plurality of data lines DL1 to DL3, respectively. In an embodiment, the first converter 241 may be connected to the first gamma voltage generator 320 that outputs the first gamma voltage set RG, and the second converter 242 may be connected to the second gamma voltage generator 330 that outputs the second gamma voltage set BG.

[0139] The third converter 243 may be connected to the third gamma voltage generator 340 outputting the third gamma voltage set GG and the high-brightness gamma voltage generator 350 outputting the high-brightness gamma voltage set HLG.

[0140] The first converter 241 and the second converter 242 can output voltages selected from the first gamma voltage set RG and the second gamma voltage set BG, respectively, as data signals (data voltages), regardless of the value of the gamma selection data GSD. Conversely, the third converter 243 can output a data signal by using one of the third gamma voltage set GG and the high-brightness gamma voltage set HLG according to the value of the gamma selection data GSD.

[0141] like Figure 7 As shown in FIG, when the gamma selection data GSD of the first value is supplied from the second latch 230 to the digital-to-analog converter 240 (eg, when Figure 6When the gamma selection data GSD corresponding to the first pixel row PXL1 is supplied to the digital-to-analog converter 240, the third converter 243 may output a data signal by using the third gamma voltage set GG.

[0142] like Figure 8 As shown in FIG, when the gamma selection data GSD of the second value is supplied from the second latch 230 to the digital-to-analog converter 240 (eg, when Figure 6 When the gamma selection data GSD corresponding to the second area DA2 of the second pixel row PXL2 is supplied to the digital-to-analog converter 240, the third converter 243 may output a data signal by using the high brightness gamma voltage set HLG. Figure 7 As shown in , the converter corresponding to the first area DA1 of the second pixel row PXL2 may also output the data signal by using the third gamma voltage set GG.

[0143] That is, the high brightness gamma voltage set HLG may be applied only to the data signals of the green pixels of the second area DA2.

[0144] As described above, the display device 1000 according to the embodiment increases the brightness of only the second area DA2 corresponding to the light sensor 700 in the second mode, thereby improving the sensing sensitivity and accuracy of the light sensor 700. The gamma value of the first area DA1 is stably maintained, so the first area DA1 can display a high-quality image. Therefore, the image quality and sensing performance of the light sensor 700 can be simultaneously improved.

[0145] Figure 9A It shows that according to Figure 1 FIG 1 is a diagram showing the luminance difference of the display area DA in the driving mode of the display device 1000, and Figure 9B is shown to be supplied to Figure 1 FIG. 1 is a diagram showing a change in a data voltage of a display area DA of a display device 1000 .

[0146] Reference Figure 1 、 Figure 9A and Figure 9B , the display device 1000 can be driven in the first mode or the second mode.

[0147] In the first mode, since the same set of gamma voltages is applied to both the first area DA1 and the second area DA2 , the brightness of the first area DA1 and the brightness of the second area DA2 are substantially the same.

[0148] In the second mode, since the high brightness gamma voltage set HLG is applied only to some of the plurality of pixels P of the second area DA2 , the brightness of the second area DA2 is higher than that of the first area DA1 .

[0149] In an embodiment, Figure 9B As shown in , when the same image data is applied to the entire display area DA in the second mode, the data voltage Vdata supplied to one data line DLk may vary. For example, the data voltage Vdata may be supplied to the first area DA1 during the first period P1 and the third period P3, and the data voltage Vdata may be supplied to the second area DA2 during the second period P2. That is, the data voltage Vdata corresponding to the second area DA2, which has relatively high brightness, may be lower than the data voltage Vdata corresponding to the first area DA1.

[0150] Figure 10 It is shown that the Figure 1 FIG. 1 is a diagram of a data driver 200 and a gamma voltage source 300 ′ in a display device 1000 , and Figure 11 It is shown by Figure 10 FIG. 3 is a diagram of a set of gamma voltages generated by a gamma voltage source 300 ′.

[0151] exist Figure 10 The same reference numerals are used to refer to Figure 3 The components described above will be described below, and repeated descriptions of these components will be omitted.

[0152] Reference Figure 1 、 Figure 10 and Figure 11 , the data driver 200 and the gamma voltage source 300 ′ may be included in the driving chip 10 .

[0153] The gamma voltage source 300' may include a first gamma voltage generator 320, a second gamma voltage generator 330, and a third gamma voltage generator 340 that respectively generate a first gamma voltage set RG, a second gamma voltage set BG, and a third gamma voltage set GG. The first gamma voltage set RG, the second gamma voltage set BG, and the third gamma voltage set GG may include a red gamma voltage, a blue gamma voltage, and a green gamma voltage, respectively.

[0154] The gamma voltage source 300 ′ may include first and second high-brightness gamma voltage generators 350 and 355 that generate first and second high-brightness gamma voltage sets HLG1 and HLG2 , respectively.

[0155] The first high brightness gamma voltage generator 350 may generate a first high brightness gamma voltage set HLG1 corresponding to one of a plurality of gamma curves stored in the fourth register 390. In an embodiment, the first high brightness gamma voltage set HLG1 may include a green gamma voltage.

[0156] With respect to the second area DA2, the first high brightness gamma voltage generator 350 may replace the operation of the third gamma voltage generator 340. Therefore, in the second mode, data signals supplied to green pixels of the second area DA2 may be generated based on the first high brightness gamma voltage set HLG1.

[0157] The second high brightness gamma voltage generator 355 may generate a second high brightness gamma voltage set HLG2 corresponding to one of the plurality of gamma curves stored in the fifth register 395. In an embodiment, the second high brightness gamma voltage set HLG2 may include a blue gamma voltage.

[0158] With respect to the second area DA2, the second high brightness gamma voltage generator 355 may replace the operation of the second gamma voltage generator 330. Therefore, in the second mode, data signals supplied to the blue pixels of the second area DA2 may be generated based on the second high brightness gamma voltage set HLG2.

[0159] In the second mode, the digital-to-analog converter 240 ′ may output data signals by using the first, second, and third gamma voltage sets RG, BG, and GG and the first and second high-brightness gamma voltage sets HLG1 and HLG2 .

[0160] like Figure 11 As shown in , the brightness of the corresponding green pixel can be increased by the first high brightness gamma curve HLGC1 corresponding to the first high brightness gamma voltage set HLG1. In addition, the brightness of the corresponding blue pixel can be increased by the second high brightness gamma curve HLGC2 corresponding to the second high brightness gamma voltage set HLG2.

[0161] Therefore, since the brightness of the green pixel and the brightness of the blue pixel are both increased in the second area DA2, the brightness of the second area DA2 can be further increased. Therefore, the light sensing sensitivity and accuracy in the second mode can be further improved.

[0162] Figure 12 is a flowchart illustrating a method of driving a display device according to an embodiment of the present disclosure.

[0163] Reference Figure 12 , a method of driving a display device may convert image data into a data signal by selectively using a portion of a plurality of gamma voltage sets according to a driving mode.

[0164] In an embodiment, the display device may be driven in a first mode (S110), image data may be converted into a data signal using a first set of gamma voltages to a third set of gamma voltages in the first mode (S120), and an image may be displayed based on the converted data signal (S140). The first mode may be defined as a mode for displaying a normal image.

[0165] In an embodiment, the display device may be driven in a second mode (S210). In the second mode, first image data corresponding to a first region may be converted into a first data signal using a first gamma voltage set to a third gamma voltage set (S220). Furthermore, second image data corresponding to a second region may be converted into a second data signal using the first gamma voltage set, the second gamma voltage set, and the high-brightness gamma voltage set (S240). Thus, in the second mode, images may be displayed on the first region and the second region based on the first data signal and the second data signal (S260).

[0166] Here, the second area corresponds to a portion of the display area that overlaps with the light sensor under the display panel and performs light sensing, and the second mode is a mode in which the light sensor is activated for fingerprint recognition or the like.

[0167] In addition, in embodiments, the first to third gamma voltage sets may correspond to gamma curves for first to third color lights, respectively, and the high-brightness gamma voltage set may include a gamma curve for the same color light as the third gamma voltage set. In this case, in the second mode, the brightness of the second region may be higher than that of the first region.

[0168] As described above, the display device and method for driving the display device according to embodiments of the present disclosure increase the brightness of only the second region corresponding to the light sensor in the second mode, thereby further improving the light sensor's sensing sensitivity and accuracy. Furthermore, the gamma value of the first region, excluding the second region, is stably maintained in the second mode, allowing the first region to display a high-quality image. This improves the light sensor's sensing performance and, consequently, image quality.

[0169] Although the above has been described with reference to the embodiments of the present disclosure, those skilled in the art will appreciate that, based on this disclosure, various modifications and changes may be made to the present disclosure within a certain scope without departing from the spirit and scope of the present disclosure as disclosed.

Claims

1. A display device comprising: a display unit including a plurality of pixels arranged in a display area, the display area including a first area and a second area; a gamma voltage source comprising a plurality of gamma voltage generators configured to generate respective sets of gamma voltages; a data driver configured to convert image data into data signals by using a plurality of the gamma voltage sets and supply the data signals to the plurality of pixels; a light sensor, wherein the light sensor partially or completely overlaps with the second area; a first gamma voltage generator configured to generate a first gamma voltage set corresponding to a first color light among the plurality of gamma voltage sets; a second gamma voltage generator configured to generate a second gamma voltage set corresponding to a second color light from among the plurality of gamma voltage sets; a third gamma voltage generator configured to generate a third gamma voltage set corresponding to a third color light among the plurality of gamma voltage sets; as well as a first high-brightness gamma voltage generator configured to generate a first high-brightness gamma voltage set corresponding to at least one of the first to third color lights; wherein the data driver generates the data signals corresponding to the first and second regions by using a first group including some of the plurality of gamma voltage generators in a first mode, and generates the data signals corresponding to the second region by using a second group including gamma voltage generators different from the first group in a second mode, wherein the first group includes the first gamma voltage generator, the second gamma voltage generator, and the third gamma voltage generator, and The second group includes two of the first gamma voltage generator, the second gamma voltage generator, and the third gamma voltage generator, and the first high-brightness gamma voltage generator.

2. The display device according to claim 1, wherein The data driver generates the data signal corresponding to the first area by using the first group in the second mode.

3. The display device according to claim 1, in, the light sensors being arranged on opposite sides of a display surface of the display unit; And the display device further includes: a memory configured to store gamma selection data defining the second area and output the gamma selection data to the data driver in response to activation of the light sensor; as well as A controller is configured to supply the image data to the data driver and control the memory corresponding to the activation of the light sensor.

4. The display device according to claim 1, wherein The first high brightness gamma voltage set corresponds to green light and is applied to the data driver in the second mode, and The second group includes the second gamma voltage generator, the third gamma voltage generator, and the first high-brightness gamma voltage generator.

5. The display device according to claim 1, wherein The gamma voltage source further includes: a second high-brightness gamma voltage generator configured to generate a second high-brightness gamma voltage set corresponding to blue light, and The second group includes the first gamma voltage generator, the first high-brightness gamma voltage generator, and the second high-brightness gamma voltage generator. The display device according to claim 3 , wherein: The data driver includes: a first latch configured to synchronously latch the image data and synchronously output the image data in units of horizontal lines; a second latch configured to receive the gamma selection data from the memory in the second mode, synchronously latch the gamma selection data, and output the gamma selection data in units of the horizontal line; and A digital-to-analog converter is configured to convert the latched image data into the data signal based on the gamma selection data, the first gamma voltage set, the second gamma voltage set, the third gamma voltage set, and the first high-brightness gamma voltage set.

7. The display device according to claim 6, wherein: The digital-to-analog converter is configured to select one of the first gamma voltage set and the first high-brightness gamma voltage set based on the gamma selection data in the second mode, and output the data signal based on the selected one.

8. The display device according to claim 6, wherein: In the second mode, the digital-to-analog converter converts the latched image data corresponding to the second area into the data signal by using the second group, and In the second mode, the digital-to-analog converter converts the latched image data corresponding to the first area into the data signal by using the first group.

9. The display device according to claim 6, wherein: In the first mode, the digital-to-analog converter converts the latched image data corresponding to the first area and the second area into the data signal by using the first group.

10. The display device according to claim 3, wherein The light sensor is deactivated in the first mode and activated in the second mode, and In the second mode, the brightness of the second area is higher than the brightness of the first area.

Images