Display apparatus and method of compensating for gamma value of display apparatus

Abstract

A display apparatus and a method of compensating for a gamma value of the display apparatus are provided. The display apparatus includes a display panel, a first coordinate calculator, a second coordinate calculator, and a gamma setter. The display panel includes a first display area and a second display area. The first coordinate calculator is configured to calculate color coordinates of first image data of the first display area. The second coordinate calculator is configured to calculate color coordinates of second image data of the second display area. The gamma setter is configured to adjust luminance of the first image data, the color coordinates of the first image data, luminance of the second image data, and the color coordinates of the second image data.

Description

TECHNICAL FIELD

[0001] Example embodiments of the present inventive concept relate to a display apparatus and a method of compensating for a gamma value of the display apparatus. More particularly, example embodiments of the present inventive concept relate to a display apparatus including an electronic module and a method of compensating for a gamma value of the display apparatus. BACKGROUND

[0002] Generally, a display apparatus includes a display panel and a display panel driver. The display panel includes a plurality of gate lines, a plurality of data lines, a plurality of emission lines, and a plurality of pixels. The display panel driver includes a gate driver, a data driver, an emission driver, and a driving controller. The gate driver outputs a gate signal to the gate lines. The data driver outputs a data voltage to the data lines. The emission driver outputs an emission signal to the emission lines. The driving controller controls the gate driver, the data driver, and the emission driver.

[0003] The display apparatus can further include an electronic module for operating additional functions. When the electronic module is disposed under the display panel, a transmissive area can be formed in the display panel for the operation of the electronic module, such that a difference in luminance and a difference in color coordinates of an image on the display panel can occur due to the transmissive area. SUMMARY

[0004] Example embodiments of the present inventive concept provide a display apparatus that performs gamma compensation for a first display area overlaid with an electronic module and a second display area not overlaid with the electronic module.

[0005] Example embodiments of the present inventive concept further provide a method of compensating for a gamma value of a display apparatus.

[0006] In example embodiments of a display apparatus according to the present inventive concept, the display apparatus includes a display panel, a first coordinate calculator, a second coordinate calculator, and a gamma setter. The display panel includes a first display area and a second display area. The first coordinate calculator is configured to calculate color coordinates of first image data of the first display area. The second coordinate calculator is configured to calculate color coordinates of second image data of the second display area. The gamma setter is configured to adjust luminance of the first image data, the color coordinates of the first image data, luminance of the second image data, and the color coordinates of the second image data.

[0007] In example embodiments, the display apparatus can further include a compensation verifier configured to determine that the luminance of the first image data compensated for by the gamma setter is in a target luminance range and the color coordinates of the first image data compensated for by the gamma setter are in a target color coordinate range, and determine that the luminance of the second image data compensated for by the gamma setter is in the target luminance range and the color coordinates of the second image data compensated for by the gamma setter are in the target color coordinate range.

[0008] In an example embodiment, the display apparatus can further include an image receiver configured to receive the first image data and the second image data, and an image storage configured to store the first image data and the second image data received from the image receiver, and transmit the first image data to the first coordinate calculator and the second image data to the second coordinate calculator.

[0009] In an example embodiment, the display apparatus can further include an image processor configured to receive the first image data and the second image data from the image storage, and convert the first image data and the second image data into a form suitable for display on the display panel.

[0010] In an example embodiment, the display apparatus can further include a first curve calculator configured to receive color coordinates of the first image data from the first coordinate calculator and calculate a gamma curve of the first image data, and a second curve calculator configured to receive color coordinates of the second image data from the second coordinate calculator and calculate a gamma curve of the second image data.

[0011] In an example embodiment, the first display area can include a display portion and a transmissive portion. The second display area can not include the transmissive portion.

[0012] In an example embodiment, the display apparatus can further include an electronic module disposed under the display panel in an area corresponding to the first display area.

[0013] In an example embodiment, the electronic module can be a camera module.

[0014] In an example embodiment, the camera module can overlap the first display area in a plan view. The camera module can have a circular shape. The first display area can be disposed at a first end portion of the display panel.

[0015] The first display area can have a rectangular shape. The second display area can be a portion of a display area of the display panel other than the first display area.

[0016] In an example embodiment, the camera module can overlap the first display area in a plan view. The camera module can have a circular shape. The first display area can be disposed at a first end portion of the display panel.

[0017] The first display area can have a circular shape. The second display area can be a portion of a display area of the display panel other than the first display area.

[0018] In an example embodiment, the electronic module can be a face recognition sensor configured to recognize a face of a user.

[0019] In an example embodiment of a display apparatus according to the inventive concept, the display apparatus includes a display panel, a first gamma controller, and a second gamma controller. The display panel includes a first display area and a second display area. The first gamma controller is configured to adjust a luminance of first input image data of the first display area, a color coordinate of the first input image data, a luminance of second input image data of the second display area, and a color coordinate of the second input image data. The second gamma controller is connected in series to the first gamma controller. The second gamma controller is configured to adjust the luminance of the first input image data and the color coordinate of the first input image data, and is configured not to adjust the luminance of the second input image data and the color coordinate of the second input image data.

[0020] In an example embodiment, the display apparatus can further include an electronic module disposed under the display panel. The electronic module can be disposed in an area corresponding to the first display area. The electronic module can not be disposed in an area corresponding to the second display area.

[0021] In an example embodiment, the first gamma controller can be configured to receive a plurality of first compensation values corresponding to a plurality of gray values, configured to receive the first input image data and the second input image data, and configured to apply the plurality of first compensation values to the first input image data and the second input image data according to gray values of the first input image data and the second input image data.

[0022] In an example embodiment, the second gamma controller can be configured to receive a plurality of second compensation values corresponding to the plurality of gray values, configured to receive the compensated first input image data, i.e., the first input image data to which the first compensation values are applied, and configured to apply the plurality of second compensation values to the compensated first input image data according to gray values of the compensated first input image data.

[0023] In an example embodiment of a method of compensating for a gamma value of a display apparatus, the method includes calculating a color coordinate of first image data of a first display area of a display panel, calculating a color coordinate of second image data of a second display area of the display panel, and adjusting a luminance of the first image data, a color coordinate of the first image data, a luminance of the second image data, and a color coordinate of the second image data.

[0024] In an example embodiment, the method can further include determining that the adjusted luminance of the first image data is in a target luminance range and the adjusted color coordinate of the first image data is in a target color coordinate range, and determining that the adjusted luminance of the second image data is in the target luminance range and the adjusted color coordinate of the second image data is in the target color coordinate range.

[0025] In an example embodiment, the method may further include: receiving first image data and second image data; and sending the received first image data to a first coordinate calculator and sending the received second image data to a second coordinate calculator.

[0026] In an example embodiment, the method may further include: receiving color coordinates of first image data from a first coordinate calculator; generating a gamma curve of the first image data based on the color coordinates of the first image data; receiving color coordinates of second image data from a second coordinate calculator; and generating a gamma curve of the second image data based on the color coordinates of the second image data.

[0027] According to the display device and the method for compensating the gamma value of the display device, the display device includes a first coordinate calculator, a second coordinate calculator, a gamma setter, and a compensation verifier. The first coordinate calculator, the second coordinate calculator, the gamma setter, and the compensation verifier perform gamma compensation for first image data of a first display area superimposed on the electronic module and for second image data of a second display area not superimposed on the electronic module. Therefore, the display quality of the display panel can be improved. Attached Figure Description

[0028] The above and other features and advantages of the present invention will become more apparent from the detailed description of exemplary embodiments of the inventive concept with reference to the accompanying drawings, in which:

[0029] Figure 1 This is a block diagram illustrating an example embodiment of a display device according to a concept of the present invention;

[0030] Figure 2 It is shown Figure 1 A concept diagram of the display panel;

[0031] Figure 3A It shows the setting Figure 1 A conceptual diagram of the electronic module below the display panel;

[0032] Figure 3B It is shown Figure 1 The display panel and Figure 3A A cross-sectional view of the electronic module;

[0033] Figure 3C It is shown Figure 2 A conceptual diagram of the pixel structure of the first display area;

[0034] Figure 3D It is shown Figure 2 A conceptual diagram of the pixel structure of the second display area;

[0035] Figure 4 This shows the extraction Figure 1The first image data of the first display area of ​​the display panel and Figure 1 A conceptual diagram illustrating the operation of the second image data in the second display area of ​​the display panel;

[0036] Figure 5 It is shown Figure 1 A block diagram of the drive controller;

[0037] Figure 6 This is a block diagram illustrating a first gamma controller and a second gamma controller of a display device drive controller according to an exemplary embodiment of the present invention;

[0038] Figure 7 This is a table showing the brightness of grayscale values ​​after gamma compensation according to the comparative embodiment;

[0039] Figure 8 This is a graph showing the brightness of grayscale values ​​after gamma compensation according to a comparative embodiment;

[0040] Figure 9 It is shown Figure 1 The table of brightness of grayscale values ​​after gamma compensation for the drive controller;

[0041] Figure 10A It is shown Figure 1 A graph showing the brightness of grayscale values ​​after gamma compensation for the drive controller;

[0042] Figure 10B This illustrates the brightness difference of grayscale values ​​after gamma compensation according to the comparative embodiment and the difference based on... Figure 1 A graph showing the brightness difference of grayscale values ​​after gamma compensation by the drive controller;

[0043] Figure 10C This illustrates the color coordinate difference of grayscale values ​​after gamma compensation according to the comparative embodiment and according to... Figure 1 A graph showing the color coordinate difference of grayscale values ​​after gamma compensation by the drive controller; and

[0044] Figure 11 This is a conceptual diagram illustrating a display panel of a display device according to an example embodiment of the present invention. Detailed Implementation

[0045] The concept of the invention will be explained in detail below with reference to the accompanying drawings.

[0046] Figure 1 This is a block diagram illustrating an example embodiment of a display device according to a concept of the present invention.

[0047] Reference Figure 1The display apparatus includes a display panel 100 and a display panel driver. The display panel driver includes a driving controller 200, a gate driver 300, a gamma reference voltage generator 400, a data driver 500, and an emission driver 600.

[0048] The driving controller 200 and the data driver 500 can be integrally formed in one IC chip. The driving controller 200, the gamma reference voltage generator 400, and the data driver 500 can be integrally formed in one IC chip. The driving controller 200, the gate driver 300, the gamma reference voltage generator 400, and the data driver 500 can be integrally formed in one IC chip. The driving controller 200, the gate driver 300, the gamma reference voltage generator 400, the data driver 500, and the emission driver 600 can be integrally formed in one IC chip.

[0049] The display panel 100 includes a plurality of gate lines GL, a plurality of data lines DL, a plurality of emission lines EL, and a plurality of pixels (not shown) electrically connected to the gate lines GL, the data lines DL, and the emission lines EL. The gate lines GL extend in a first direction D1, the data lines DL extend in a second direction D2 crossing the first direction D1, and the emission lines EL extend in the first direction D1.

[0050] The driving controller 200 receives input image data IMG and input control signals CONT from an external apparatus. For example, the input image data IMG can include red image data, green image data, and blue image data. The input image data IMG can include white image data. The input image data IMG can include magenta image data, cyan image data, and yellow image data. The input control signals CONT can include a main clock signal and a data enable signal. The input control signals CONT can further include a vertical synchronization signal and a horizontal synchronization signal.

[0051] The driving controller 200 generates first control signals CONT1, second control signals CONT2, third control signals CONT3, fourth control signals CONT4, and data signals DATA based on the input image data IMG and the input control signals CONT.

[0052] The driving controller 200 generates the first control signals CONT1 for controlling operations of the gate driver 300 based on the input control signals CONT, and outputs the first control signals CONT1 to the gate driver 300. The first control signals CONT1 can include a vertical start signal and a gate clock signal.

[0053] The drive controller 200 generates a second control signal CONT2 for controlling the operation of the data driver 500 based on the input control signal CONT, and outputs the second control signal CONT2 to the data driver 500. The second control signal CONT2 can include a horizontal start signal and a load signal.

[0054] The drive controller 200 generates a data signal DATA based on the input image data IMG. The drive controller 200 outputs the data signal DATA to the data driver 500.

[0055] The drive controller 200 generates a third control signal CONT3 for controlling the operation of the gamma reference voltage generator 400 based on the input control signal CONT, and outputs the third control signal CONT3 to the gamma reference voltage generator 400.

[0056] The drive controller 200 generates a fourth control signal CONT4 for controlling the operation of the emission driver 600 based on the input control signal CONT, and outputs the fourth control signal CONT4 to the emission driver 600.

[0057] The gate driver 300 generates a gate signal for driving the gate line GL in response to the first control signal CONT1 received from the drive controller 200. The gate driver 300 can output the gate signal to the gate line GL. The gate driver 300 can be directly integrated on the display panel 100. The gate driver 300 can be mounted on the display panel 100 in the form of an IC chip.

[0058] The gamma reference voltage generator 400 generates a gamma reference voltage VGREF in response to the third control signal CONT3 received from the drive controller 200. The gamma reference voltage generator 400 provides the gamma reference voltage VGREF to the data driver 500. The gamma reference voltage VGREF has a value corresponding to a level of the data signal DATA.

[0059] In an example embodiment, the gamma reference voltage generator 400 can be embedded in the drive controller 200, or embedded in the data driver 500.

[0060] The data driver 500 receives the second control signal CONT2 and the data signal DATA from the drive controller 200, and receives the gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 converts the data signal DATA into a data voltage having an analog type using the gamma reference voltage VGREF. The data driver 500 outputs the data voltage to the data line DL.

[0061] The emission driver 600 generates an emission signal to drive the emission line EL in response to a fourth control signal CONT4 received from the driving controller 200. The emission driver 600 can output the emission signal to the emission line EL. The emission driver 600 can be directly integrated on the display panel 100. The emission driver 600 can be mounted on the display panel 100 in the form of an IC chip. Although, for convenience of explanation, the gate driver 300 is disposed in the first side of the pixels of the display panel 100 and applies the gate signal to the pixels, and the emission driver 600 is disposed in the second side of the pixels of the display panel 100 and applies the emission signal to the pixels, the inventive concept can not be limited thereto. Alternatively, the gate driver 300 and the emission driver 600 can be disposed in the first side of the pixels of the display panel 100 and apply the gate signal and the emission signal to the pixels. Alternatively, the gate driver 300 and the emission driver 600 can be disposed in both sides of the pixels of the display panel 100 and apply the gate signal and the emission signal to the pixels.

[0062] Figure 2 is a conceptual diagram illustrating a display panel 100 of Figure 1 . Figure 3A is a conceptual diagram illustrating an electronic module CM disposed under a display panel of Figure 1 . Figure 3B is a cross-sectional view illustrating a display panel 100 of Figure 1 and an electronic module CM of Figure 3A . Figure 3C is a conceptual diagram illustrating a pixel structure of a first display area DA of Figure 2 . Figure 3D is a conceptual diagram illustrating a pixel structure of a second display area DB of Figure 2 .

[0063] Referring to Figures 1-3D , the display panel 100 can include a first display area DA and a second display area DB surrounding the first display area DA.

[0064] The display apparatus can further include an electronic module CM disposed under the display panel 100. In the present example embodiment, the electronic module CM can be a camera module. Alternatively, the electronic module CM can be a sensor module.

[0065] The electronic module CM can be an electronic element using light or sound. For example, the electronic element can be a sensor that receives and uses light, such as an infrared sensor. For example, the electronic element can be a camera that captures an image by receiving light. For example, the electronic element can be a sensor that measures a distance of an object or recognizes a fingerprint by outputting and detecting light and sound. For example, the electronic element can be a lamp that outputs light. For example, the electronic element can be a speaker that outputs sound. The electronic element using light can use light of various wavebands such as visible light, infrared light, and ultraviolet light.

[0066] For example, the electronic module CM can include a plurality of sensors that sense a user. For example, the electronic module CM can be used as at least one of a proximity sensor that determines proximity of a user, a gesture sensor that determines a gesture of a user, a fingerprint sensor that recognizes a fingerprint of a user, an iris recognition sensor that recognizes an iris of a user, and a face recognition sensor that recognizes a face of a user.

[0067] In the present example embodiment, the electronic module CM can be superposed with the first end portion of the display panel 100. The electronic module CM can have a circular shape. The electronic module CM can be superposed with the first display area DA of the display panel 100. The electronic module CM can not be superposed with the second display area DB.

[0068] For example, the first display area DA can have a shape corresponding to an area in which the electronic module CM is disposed. For example, the first display area DA can have a rectangular shape, can be disposed at the first end portion of the display panel 100, and can be superposed with an area in which the electronic module CM is disposed. However, the shape of the first display area DA is not limited to the rectangular shape, but can have a circular shape and a polygonal shape including a rectangular shape, a hexagonal shape, etc.

[0069] The second display area DB can be a portion of the display area of the display panel 100 other than the first display area DA. For example, the first display area DA and the second display area DB are not superposed with each other, and a combined area of the first display area DA and the second display area DB can cover the entire display area of the display panel 100.

[0070] For example, the first display area DA can be a display area superposed with a camera. For example, the first display area DA can be a display area superposed with a sensor. For example, the first display area DA can include a transmissive portion and a display portion, and the second display area DB can not include the transmissive portion but can include only the display portion.

[0071] For example, the density of the pixels of the first display area DA can be different from the density of the pixels of the second display area DB. For example, the size of the pixels of the first display area DA can be different from the size of the pixels of the second display area DB. For example, the emission area of the first display area DA can be different from the emission area of the second display area DB. For example, the number of the pixels per unit area of the first display area DA can be different from the number of the pixels per unit area of the second display area DB. For example, the shape of the pixels of the first display area DA can be different from the shape of the pixels of the second display area DB.

[0072] As shown in Figure 3B , the first display area DA of the display panel 100 can include a transmissive portion TA in which no pixel P is provided. The first display area DA of the display panel 100 can include the substrate 10, the display layer 20 provided on the substrate 10, the encapsulation layer 30 provided on the display layer 20, the input sensing layer 40 provided on the encapsulation layer 30, the optical functional layer 50 provided on the input sensing layer 40, the adhesive layer OCA provided on the optical functional layer 50, and the window 60 provided on the adhesive layer OCA.

[0073] The display layer 20 includes the pixels P. The pixels P can not be provided in the transmissive portion TA of the first display area DA.

[0074] The lower protective film 70 can be provided under the substrate 10. The lower protective film 70 can have a recess in a region corresponding to the electronic module CM. Unlike Figure 3B , the lower protective film 70 can not have a recess in a region corresponding to the electronic module CM.

[0075] As shown in Figure 3C , the first display area DA can include a display portion in which pixels are provided and a transmissive portion TA in which no pixel is provided. As shown in Figure 3D , the second display area DB can include only a display portion in which pixels are provided, and not a transmissive portion TA.

[0076] Figure 4 is a conceptual diagram illustrating an operation of extracting first image data of the first display area DA of the display panel 100 of Figure 1 and second image data of the second display area DB of the display panel 100 of Figure 1 . Figure 5 is a block diagram illustrating the drive controller 200 of Figure 1 .

[0077] Referring to Figures 1-5A first image displayed at a central portion PA of a first display area DA of the display panel 100 can be captured by a first image device CAM1 for gamma compensation of the display device. Data captured by the first image device CAM1 can be referred to as first image data.

[0078] A second image displayed at a central portion PB of a second display area DB of the display panel 100 can be captured by a second image device CAM2 for gamma compensation of the display device. Data captured by the second image device CAM2 can be referred to as second image data.

[0079] The first display area DA can correspond to an area in which the electronic module CM is provided. The first display area DA can further include an area surrounding the area in which the electronic module CM is provided. The second display area DB can be a display area other than the first display area DA among the display areas. A pixel structure of the first display area DA can be different from a pixel structure of the second display area DB. For example, a size of a switching element in a pixel of the first display area DA can be different from a size of a switching element in a pixel of the second display area DB. For example, a current-voltage curve of the switching element in the pixel of the first display area DA can be different from a current-voltage curve of the switching element in the pixel of the second display area DB. For example, a luminance per unit area of the first display area DA can be different from a luminance per unit area of the second display area DB.

[0080] Generally, when the display device does not include the electronic module, only a central portion (e.g., the central portion PB) of the display panel 100 can be captured to perform gamma compensation. However, when the display device includes the electronic module, a pixel structure of the first display area DA and a pixel structure of the second display area DB are different from each other. Accordingly, when only the central portion (e.g., the central portion PB) of the display panel 100 is captured to perform gamma compensation for the display device including the electronic module, it can not be possible to properly perform gamma compensation for the first display area DA.

[0081] Accordingly, in the present example embodiment, gamma compensation can be performed using the first image data of the first display area DA and the second image data of the second display area DB. For example, a diameter of a lens of the first image device CAM1 can be smaller than a diameter of a lens of the second image device CAM2.

[0082] The drive controller 200 can perform gamma compensation of the display device. The drive controller 200 can include a gamma setter 240, a first coordinate calculator 250, and a second coordinate calculator 255.

[0083] The first coordinate calculator 250 can calculate color coordinates of the first image data of the first display area DA. The second coordinate calculator 255 can calculate color coordinates of the second image data of the second display area DB.

[0084] The gamma setter 240 can compensate for a gamma value of the first image data by adjusting the luminance of the first image data and the color coordinates of the first image data. For example, the gamma setter 240 can adjust the luminance of the first image data and the color coordinates of the first image data so that the luminance of the first image data and the color coordinates of the first image data are close to a target luminance and target color coordinates.

[0085] For example, the gamma setter 240 can adjust the luminance of the first image data and the color coordinates of the first image data by changing a gray value of the first image data.

[0086] The drive controller 200 can further include a compensation verifier 270 that determines that the luminance of the first image data and the color coordinates of the first image data compensated for by the gamma setter 240 are in a target luminance range and a target color coordinate range, respectively, and determines that the luminance of the second image data and the color coordinates of the second image data compensated for by the gamma setter 240 are in the target luminance range and the target color coordinate range, respectively.

[0087] When the luminance of the first image data and the color coordinates of the first image data compensated for by the gamma setter 240 exceed the target luminance range and the target color coordinate range, the gamma setter 240 can adjust the luminance of the first image data and the color coordinates of the first image data until the luminance of the first image data and the color coordinates of the first image data are close to the target luminance and the target color coordinates.

[0088] Similarly, when the luminance of the second image data and the color coordinates of the second image data compensated for by the gamma setter 240 exceed the target luminance range and the target color coordinate range, the gamma setter 240 can adjust the luminance of the second image data and the color coordinates of the second image data until the luminance of the second image data and the color coordinates of the second image data are close to the target luminance and the target color coordinates.

[0089] For example, for the highest gray value, the target luminance can be 420 nits, and the target color coordinates can be (0.299, 0.315).

[0090] The driving controller 200 can further include an image receiver 210 receiving first image data from the first image device CAM1 and second image data from the second image device CAM2, and an image memory 220 storing the first image data and the second image data received from the image receiver 210 and transmitting the first image data to the first coordinate calculator 250 and the second image data to the second coordinate calculator 255.

[0091] The driving controller 200 can further include an image processor 230 receiving the first image data and the second image data from the image memory 220 and converting the first image data and the second image data into a form suitable for display on the display panel 100.

[0092] For example, the image processor 230 can receive the first image data and the second image data and can convert the first image data and the second image data into a data signal DATA. The image processor 230 can output the data signal DATA to the data driver 500.

[0093] The data driver 500 can convert the data signal DATA into a data voltage and can output the data voltage to the display panel 100.

[0094] When the gamma setter 240 adjusts the first image data and the second image data, the image processor 230 receives the adjusted first image data and the adjusted second image data and converts the adjusted first image data and the adjusted second image data into a form suitable for display on the display panel 100.

[0095] When the gamma setter 240 adjusts the first image data and the second image data, the adjusted first image data and the adjusted second image data are output to the display panel 100 through the image processor 230 so that a user can check a change in the image with the eyes.

[0096] The driving controller 200 can further include a first curve calculator 260 receiving color coordinates of the first image data from the first coordinate calculator 250 and generating a gamma curve of the first image data, and a second curve calculator 265 receiving color coordinates of the second image data from the second coordinate calculator 255 and generating a gamma curve of the second image data. The first curve calculator 260 and the second curve calculator 265 can output the gamma curve of the first image data and the gamma curve of the second image data to the first image device CAM1 and the second image device CAM2, respectively.

[0097] Figure 6is a block diagram of a first gamma controller GC1 and a second gamma controller GC2 of a drive controller 200 of a display apparatus illustrating an example embodiment according to the inventive concept.

[0098] Referring to Figures 1-4 and Figure 6 The first gamma controller GC1 and the second gamma controller GC2 can be example implementations of the drive controller 200.

[0099] When receiving the input image data IMG, the first gamma controller GC1 and the second gamma controller GC2 can perform gamma compensation on the input image data IMG using the determined compensation values, and can transmit the compensated data to the data driver 500.

[0100] For example, the first gamma controller GC1 can compensate both the first input image data corresponding to the first display area DA and the second input image data corresponding to the second display area DB.

[0101] For example, the second gamma controller GC2 can compensate only the first input image data corresponding to the first display area DA, and can not compensate the second input image data corresponding to the second display area DB.

[0102] The first gamma controller GC1 can adjust the luminance of the first input image data, the color coordinates of the first input image data, the luminance of the second input image data, and the color coordinates of the second input image data. For example, the first gamma controller GC1 can adjust the luminance of the first input image data and the color coordinates of the first input image data by changing the gray scale values of the first input image data. For example, the first gamma controller GC1 can adjust the luminance of the second input image data and the color coordinates of the second input image data by changing the gray scale values of the second input image data.

[0103] The first gamma controller GC1 can receive a plurality of first compensation values COMP1 to COMPN corresponding to a plurality of gray scale values, receive the first input image data and the second input image data as input signals IDATA, and apply the first compensation values COMP1 to COMPN to the first input image data and the second input image data according to the gray scale values of the first input image data and the second input image data to generate output signals ODATA. The first gamma controller GC1 can output the output signals ODATA.

[0104] The first gamma controller GC1 can receive a first input control signal ITC. For example, the first input control signal ITC can include a first input vertical start signal, a first input horizontal start signal, and a first input data enable signal.

[0105] The first gamma controller GC1 can output a first output control signal OTC. For example, the first output control signal OTC can include a first output vertical start signal, a first output horizontal start signal, and a first output data enable signal. For example, the first gamma controller GC1 can output the first output control signal OTC to the second gamma controller GC2. Also, in an embodiment, the first gamma controller GC1 can further output the first output control signal OTC to the gate driver 300 and the data driver 500.

[0106] The second gamma controller GC2 can be disposed at a next stage of the first gamma controller GC1. The second gamma controller GC2 can receive the output signal ODATA of the first gamma controller GC1 as an input signal (input signal LIDATA). The second gamma controller GC2 can adjust the luminance of the first input image data to which the first compensation values COMP1 to COMPN are applied (hereinafter, referred to as "compensated first input image data") and the color coordinates of the compensated first input image data, and can not adjust the luminance of the second input image data to which the first compensation values COMP1 to COMPN are applied (hereinafter, referred to as "compensated second input image data") and the color coordinates of the compensated second input image data.

[0107] The second gamma controller GC2 can receive a plurality of second compensation values LCOMP1 to LCOMPN corresponding to a plurality of gray values, receive the compensated first input image data (output signal ODATA) as an input signal LIDATA, and apply the second compensation values LCOMP1 to LCOMPN to the compensated first input image data according to the gray value of the compensated first input image data to generate an output signal LODATA. The second gamma controller GC2 can output the output signal LODATA. The second gamma controller GC2 can output the output signal LODATA to the data driver 500.

[0108] The second gamma controller GC2 does not adjust the luminance of the second input image data and the color coordinates of the second input image data. When the second input image data is received as the input signal LIDATA, the second gamma controller GC2 can output the input signal LIDATA as the output signal LODATA as it is. The second gamma controller GC2 can output the output signal LODATA to the data driver 500.

[0109] The second gamma controller GC2 can receive a second input control signal LITC. For example, the second input control signal LITC can include a second input vertical start signal, a second input horizontal start signal, and a second input data enable signal. For example, the second input control signal LITC of the second gamma controller GC2 can be the first output control signal OTC of the first gamma controller GC1.

[0110] The second gamma controller GC2 can receive an enable signal LGCON for a compensation operation of the second gamma controller GC2. The enable signal LGCON can have an active level when the second gamma controller GC2 receives the compensated first input image data. The enable signal LGCON can have an inactive level when the second gamma controller GC2 receives the compensated second input image data.

[0111] The second gamma controller GC2 can output a second output control signal LOTC. For example, the second output control signal LOTC can include a second output vertical start signal, a second output horizontal start signal, and a second output data enable signal. The second gamma controller GC2 can output the second output control signal LOTC to the gate driver 300 and the data driver 500.

[0112] Figure 7 FIG. 7 is a table illustrating luminance for gray values after gamma compensation according to a comparative embodiment. Figure 8 FIG. 8 is a graph illustrating luminance for gray values after gamma compensation according to a comparative embodiment.

[0113] For example, in the comparative embodiment of Figure 7 and Figure 8 , the drive controller 200 of Figure 1 can perform gamma compensation based on only the second display area DB without considering the first display area DA.

[0114] In the comparative embodiment of Figure 7 and Figure 8 , luminance of the second display area DB not corresponding to the electronic module is 0.045019 nit for a gray value of 4, 0.206852 nit for a gray value of 8, 90.62105 nit for a gray value of 127, and 420 nit for a gray value of 255. Here, luminance of the second display area DB and color coordinates of the second display area DB can be compensated to match target luminance and target color coordinates.

[0115] In the comparative embodiment of Figure 7 and Figure 8In the case of the electronic module, the luminance of the first display area DA is 0.157477893 nit for a gray scale value of 4, 0.629911572 nit for a gray scale value of 8, 158.7475586 nit for a gray scale value of 127, and 640 nit for a gray scale value of 255. Here, the luminance of the first display area DA and the color coordinates of the first display area DA can greatly differ from the target luminance and the target color coordinates.

[0116] In the case of the electronic module, the luminance of the first display area DA is 0.157477893 nit for a gray scale value of 4, 0.629911572 nit for a gray scale value of 8, 158.7475586 nit for a gray scale value of 127, and 640 nit for a gray scale value of 255. Here, the luminance of the first display area DA and the color coordinates of the first display area DA can greatly differ from the target luminance and the target color coordinates. Figure 8 In the case of the electronic module, the luminance of the first display area DA is 0.157477893 nit for a gray scale value of 4, 0.629911572 nit for a gray scale value of 8, 158.7475586 nit for a gray scale value of 127, and 640 nit for a gray scale value of 255. Here, the luminance of the first display area DA and the color coordinates of the first display area DA can greatly differ from the target luminance and the target color coordinates.

[0117] Figure 9 Figure 1 is a table showing the luminance of the driving controller 200 according to the gray scale value after gamma compensation. Figure 10A is a graph showing the luminance of the driving controller 200 according to the gray scale value after gamma compensation. Figure 1 is a table showing the luminance of the driving controller 200 according to the gray scale value after gamma compensation. Figure 10B is a graph showing the luminance difference according to the gray scale value after gamma compensation according to the comparative example and the luminance difference of the driving controller 200 according to the gray scale value after gamma compensation. Figure 1 is a graph showing the color coordinate difference according to the gray scale value after gamma compensation according to the comparative example and the color coordinate difference of the driving controller 200 according to the gray scale value after gamma compensation.

[0118] Figure 10C is a graph showing the color coordinate difference according to the gray scale value after gamma compensation according to the comparative example and the color coordinate difference of the driving controller 200 according to the gray scale value after gamma compensation. Figure 1 For example, in the embodiments of

[0119] and Figure 9 , the driving controller 200 of the electronic module can perform gamma compensation considering both the first display area DA and the second display area DB. Figure 10A Figure 1 In the case of the electronic module, the luminance of the first display area DA is 0.157477893 nit for a gray scale value of 4, 0.629911572 nit for a gray scale value of 8, 158.7475586 nit for a gray scale value of 127, and 640 nit for a gray scale value of 255. Here, the luminance of the first display area DA and the color coordinates of the first display area DA can greatly differ from the target luminance and the target color coordinates.

[0120] In the case of the electronic module, the luminance of the first display area DA is 0.157477893 nit for a gray scale value of 4, 0.629911572 nit for a gray scale value of 8, 158.7475586 nit for a gray scale value of 127, and 640 nit for a gray scale value of 255. Here, the luminance of the first display area DA and the color coordinates of the first display area DA can greatly differ from the target luminance and the target color coordinates. Figure 9 Figure 10A In the case of the electronic module, the luminance of the first display area DA is 0.157477893 nit for a gray scale value of 4, 0.629911572 nit for a gray scale value of 8, 158.7475586 nit for a gray scale value of 127, and 640 nit for a gray scale value of 255. Here, the luminance of the first display area DA and the color coordinates of the first display area DA can greatly differ from the target luminance and the target color coordinates.

[0121] In the case of the electronic module, the luminance of the first display area DA is 0.157477893 nit for a gray scale value of 4, 0.629911572 nit for a gray scale value of 8, 158.7475586 nit for a gray scale value of 127, and 640 nit for a gray scale value of 255. Here, the luminance of the first display area DA and the color coordinates of the first display area DA can greatly differ from the target luminance and the target color coordinates. Figure 9 Figure 10A ​​​​In the case where the first display area DA corresponds to the electronic module, the luminance of the first display area DA is 0.055017854 nit for a gray value of 4, 0.244184526 nit for a gray value of 8, 93.164974 nit for a gray value of 127, and 417 nit for a gray value of 255. Here, the luminance of the first display area DA and the color coordinates of the first display area DA can be set in a target luminance range and a target color coordinate range.

[0122] In the case where the first display area DA corresponds to the electronic module, Figure 10A In the case where the first display area DA corresponds to the electronic module, the luminance curve of the first display area DA can be substantially identical to the luminance curve of the second display area DB.

[0123] In the case where the first display area DA corresponds to the electronic module, Figure 10B In the case where the driving controller 200 performs gamma compensation based on only the second display area DB without considering the first display area DA (DGC (Dynamic Gamma Control) OFF), the luminance difference between the luminance of the first display area DA and the luminance of the second display area DB can exceed 20% for a gray value between 32 and 192, and can exceed 10% for a gray value of 224 and 255.

[0124] In contrast, according to the present example embodiment, when the driving controller 200 performs gamma compensation considering both the first display area DA and the second display area DB (DGC (Dynamic Gamma Control) ON), the luminance difference between the luminance of the first display area DA and the luminance of the second display area DB can be less than 10% for a gray value between 32 and 255.

[0125] In the case where the first display area DA corresponds to the electronic module, Figure 10C In the case where the driving controller 200 performs gamma compensation based on only the second display area DB without considering the first display area DA (DGC OFF), the color coordinate difference Au'v' between the color coordinates of the first display area DA and the color coordinates of the second display area DB can be about 0.02 for a gray value between 32 and 255.

[0126] In contrast, according to the present example embodiment, when the driving controller 200 performs gamma compensation considering both the first display area DA and the second display area DB (DGC ON), the color coordinate difference Au'v' between the color coordinates of the first display area DA and the color coordinates of the second display area DB can be less than 0.01 for a gray value between 32 and 255.

[0127] According to the present example embodiment, the display apparatus includes a first coordinate calculator 250, a second coordinate calculator 255, a gamma setter 240, and a compensation verifier 270, which perform gamma compensation (gamma correction) for first image data of a first display area DA overlaid with an electronic module CM and for second image data of a second display area DB not overlaid with the electronic module CM. Accordingly, it is possible to improve the display quality of the display panel 100.

[0128] Figure 11 is a conceptual diagram illustrating a display panel 100A of a display apparatus according to an example embodiment of the inventive concept.

[0129] The display apparatus according to the present example embodiment and the method of compensating for a gamma value of the display apparatus are substantially the same as the display apparatus and the method of compensating for a gamma value of the display apparatus described with reference to the previous example embodiments, except for the connection structure of the pixels in the first display area DA and the pixels in the second display area DB. Figures 1-10C The display apparatus and the method of compensating for a gamma value of the display apparatus according to the present example embodiment are substantially the same as the display apparatus and the method of compensating for a gamma value of the display apparatus described with reference to the previous example embodiments. Accordingly, the same reference numerals will be used to denote components that are the same as or similar to those described in the previous example embodiments, and any repetitive explanation regarding the above elements will be omitted. Figures 1-10C The display apparatus and the method of compensating for a gamma value of the display apparatus according to the present example embodiment are substantially the same as the display apparatus and the method of compensating for a gamma value of the display apparatus described with reference to the previous example embodiments. Accordingly, the same reference numerals will be used to denote components that are the same as or similar to those described in the previous example embodiments, and any repetitive explanation regarding the above elements will be omitted.

[0130] Referring to Figure 1 and Figures 3A-11 , the display apparatus includes a display panel 100A and a display panel driver. The display panel driver includes a driving controller 200, a gate driver 300, a gamma reference voltage generator 400, a data driver 500, and an emission driver 600.

[0131] The display panel 100A can include a first display area DA and a second display area DB.

[0132] The display apparatus can further include an electronic module CM disposed under the display panel 100A. In the present example embodiment, the electronic module CM can be a camera module CM. Alternatively, the electronic module CM can be a sensor module.

[0133] In the present example embodiment, the electronic module CM can be overlaid with a first end portion of the display panel 100A. The electronic module CM and the first display area DA can have a circular shape. The electronic module CM can be overlaid with the first display area DA of the display panel 100A. The electronic module CM can not be overlaid with the second display area DB.

[0134] In the present example embodiment, the first display area DA can have a circular shape, can be disposed at a first end portion of the display panel 100A, and can be overlaid with the electronic module CM.

[0135] In the present example embodiment, the second display region DB can be a portion of the display region of the display panel 100A other than the first display region DA. For example, the first display region DA and the second display region DB do not overlap each other, and a combined region of the first display region DA and the second display region DB can cover the entire display region of the display panel 100A.

[0136] The drive controller 200 can perform gamma compensation of the display device. The drive controller 200 can include a gamma setter 240, a first coordinate calculator 250, and a second coordinate calculator 255.

[0137] The first coordinate calculator 250 can calculate color coordinates of the first image data of the first display region DA. The second coordinate calculator 255 can calculate color coordinates of the second image data of the second display region DB.

[0138] The gamma setter 240 can compensate for a gamma value of the first image data by adjusting a luminance of the first image data and the color coordinates of the first image data. For example, the gamma setter 240 can adjust the luminance of the first image data and the color coordinates of the first image data so that the luminance of the first image data and the color coordinates of the first image data approach a target luminance and target color coordinates.

[0139] For example, the gamma setter 240 can adjust the luminance of the first image data and the color coordinates of the first image data by changing a gray value of the first image data.

[0140] The drive controller 200 can further include a compensation verifier 270 that determines that the luminance of the first image data and the color coordinates of the first image data compensated for by the gamma setter 240 are in a target luminance range and a target color coordinate range, respectively, and determines that the luminance of the second image data and the color coordinates of the second image data compensated for by the gamma setter 240 are in the target luminance range and the target color coordinate range, respectively.

[0141] According to the present example embodiment, the display device includes the first coordinate calculator 250, the second coordinate calculator 255, the gamma setter 240, and the compensation verifier 270, which perform gamma compensation (gamma correction) for the first image data of the first display region DA overlapping the electronic module CM and for the second image data of the second display region DB not overlapping the electronic module CM. Accordingly, it is possible to improve the display quality of the display panel 100A.

[0142] According to the present inventive concept as explained above, it is possible to improve the display quality of a display panel of a display device including an electronic module.

[0143] The foregoing is a summary of the present inventive concept and is not to be construed as limiting the present inventive concept. Although some example embodiments of the present inventive concept have been described, it will be understood by those skilled in the art that many modifications can be made in the example embodiments without departing from the novel teachings and advantages of the present inventive concept. Accordingly, all such modifications are intended to be included within the scope of the present inventive concept as defined in the claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. Thus, although specific examples of the present inventive concept have been described herein, it will be understood that the foregoing is a summary of the present inventive concept and is not to be construed as limiting the present inventive concept, and that modifications are intended to be included within the scope of the appended claims. The present inventive concept is defined by the claims and their equivalents.

Claims

1. A display apparatus comprising: a display panel including a first display area and a second display area; a first coordinate calculator configured to calculate color coordinates of first image data of the first display area; a second coordinate calculator configured to calculate color coordinates of second image data of the second display area; and a gamma setter configured to adjust a luminance of the first image data, the color coordinates of the first image data, a luminance of the second image data, and the color coordinates of the second image data, wherein the display apparatus further comprises a compensation verifier configured to determine that the luminance of the first image data compensated by the gamma setter is in a target luminance range and the color coordinates of the first image data compensated by the gamma setter are in a target color coordinate range, and determine that the luminance of the second image data compensated by the gamma setter is in the target luminance range and the color coordinates of the second image data compensated by the gamma setter are in the target color coordinate range, and when the luminance of the first image data and the color coordinates of the first image data compensated by the gamma setter exceed the target luminance range and the target color coordinate range, the gamma setter adjusts again the luminance of the first image data and the color coordinates of the first image data until the luminance of the first image data and the color coordinates of the first image data approach the target luminance and the target color coordinates, and when the luminance of the second image data and the color coordinates of the second image data compensated by the gamma setter exceed the target luminance range and the target color coordinate range, the gamma setter adjusts again the luminance of the second image data and the color coordinates of the second image data until the luminance of the second image data and the color coordinates of the second image data approach the target luminance and the target color coordinates. 2.The display apparatus of claim 1, further comprising: an image receiver configured to receive the first image data and the second image data; and an image storage configured to store the first image data and the second image data received from the image receiver, and transmit the first image data to the first coordinate calculator and the second image data to the second coordinate calculator. 3.The display apparatus of claim 2, further comprising: an image processor configured to receive the first image data and the second image data from the image storage, and convert the first image data and the second image data into a form suitable for display on the display panel. 4.The display apparatus of claim 3, further comprising: a first curve calculator configured to receive the color coordinates of the first image data from the first coordinate calculator and calculate a gamma curve of the first image data; and a second curve calculator configured to receive the color coordinates of the second image data from the second coordinate calculator and calculate a gamma curve of the second image data. ​ ​ a second curve calculator configured to receive the color coordinates of the second image data from the second coordinate calculator and to calculate a gamma curve of the second image data.

5. The display device of claim 1, wherein, the first display area includes a display portion and a transmissive portion, and wherein the second display area does not include the transmissive portion. 6.The display apparatus of claim 5, further comprising an electronic module disposed under the display panel in a region corresponding to the first display area.

7. The display device of claim 6, wherein, the electronic module is a camera module.

8. The display device of claim 7, wherein, the camera module overlaps the first display area in a plan view, wherein the camera module has a circular shape, wherein the first display area is disposed at a first end portion of the display panel, wherein the first display area has a rectangular shape, and wherein the second display area is a portion of a display area of the display panel other than the first display area.

9. The display device of claim 7, wherein, the camera module overlaps the first display area in a plan view, wherein the camera module has a circular shape, wherein the first display area is disposed at a first end portion of the display panel, wherein the first display area has a circular shape, and wherein the second display area is a portion of a display area of the display panel other than the first display area.

10. The display device of claim 6, wherein, the electronic module is a face recognition sensor configured to recognize a face of a user. 11.A display apparatus comprising: a display panel including a first display area and a second display area; a first gamma controller configured to adjust luminance of first input image data of the first display area, color coordinates of the first input image data, luminance of second input image data of the second display area, and color coordinates of the second input image data; and a second gamma controller connected in series to the first gamma controller and configured to adjust the luminance of the first input image data and the color coordinates of the first input image data, and configured not to adjust the luminance of the second input image data and the color coordinates of the second input image data. 12.The display apparatus of claim 11, further comprising an electronic module disposed under the display panel, wherein the electronic module is disposed in a region corresponding to the first display area, and wherein the electronic module is not disposed in a region corresponding to the second display area.

13. The display device of claim 11, wherein, the first gamma controller is configured to receive a plurality of first compensation values corresponding to a plurality of gray values, configured to receive the first input image data and the second input image data, and configured to apply the plurality of first compensation values to the first input image data and the second input image data according to gray values of the first input image data and the second input image data.

14. The display device of claim 13, wherein, The second gamma controller is configured to receive a plurality of second compensation values corresponding to the plurality of gray scale values, configured to receive compensated first input image data, i.e., the first input image data to which the first compensation values are applied, and configured to apply the plurality of second compensation values to the compensated first input image data according to gray scale values of the compensated first input image data.

15. A method of compensating for gamma values of a display apparatus, the method comprising: calculating color coordinates of first image data of a first display area of a display panel; calculating color coordinates of second image data of a second display area of the display panel; and adjusting luminance of the first image data, the color coordinates of the first image data, luminance of the second image data, and the color coordinates of the second image data, wherein the method further comprises: determining that the adjusted luminance of the first image data is in a target luminance range and the adjusted color coordinates of the first image data are in a target color coordinate range, readjusting the luminance of the first image data and the color coordinates of the first image data when the adjusted luminance of the first image data and the adjusted color coordinates of the first image data exceed the target luminance range and the target color coordinate range, until the luminance of the first image data and the color coordinates of the first image data approach the target luminance and the target color coordinates; and determining that the adjusted luminance of the second image data is in the target luminance range and the adjusted color coordinates of the second image data are in the target color coordinate range, readjusting the luminance of the second image data and the color coordinates of the second image data when the adjusted luminance of the second image data and the adjusted color coordinates of the second image data exceed the target luminance range and the target color coordinate range, until the luminance of the second image data and the color coordinates of the second image data approach the target luminance and the target color coordinates.

16. The method of claim 15, the method further comprising: receiving the first image data and the second image data; and sending the received first image data to a first coordinate calculator and sending the received second image data to a second coordinate calculator.

17. The method of claim 16, the method further comprising: receiving the color coordinates of the first image data from the first coordinate calculator; generating a gamma curve of the first image data based on the color coordinates of the first image data; receiving the color coordinates of the second image data from the second coordinate calculator; and generating a gamma curve of the second image data based on the color coordinates of the second image data.

Images