Display device and compensation method thereof

Abstract

The invention discloses a display device and a compensation method of the display device. The display device comprises a display screen and a driver circuit. The display screen comprises a plurality of lamp boxes. Each lamp box comprises a plurality of lamp panels. Each lamp panel comprises a plurality of display pixels. The driver circuit is coupled to the display screen. The driver circuit is used for driving the display screen to display images. The driver circuit performs a first compensation operation on the display screen according to first compensation data, and the first compensation data is calculated based on the lamp panel. The driver circuit performs a second compensation operation on the display screen according to second compensation data, and the second compensation data is calculated on the basis of pixels.

Description

Technical Field

[0001] The present disclosure relates to a display device and a compensation method thereof, and in particular to a display device including a light emitting element and a compensation method thereof. Background Art

[0002] In addition to the surface mount devices (SMD) packaging process, there is also a chip on board (COB) packaging process for the packaging of light-emitting diode (LED) display panels on the market. Although the COB packaging process has advantages such as super strong protection and super high contrast, its sealing glue will cause inconsistent ink color. If only the current brightness and chromaticity compensation method is used, there will still be color blocks left, resulting in poor compensation effect. Summary of the invention

[0003] The present disclosure provides a display device and a compensation method thereof, which can improve the brightness uniformity and chromaticity uniformity of a display screen.

[0004] The display device of the embodiment of the present disclosure includes a display screen and a driver circuit. The display screen includes a plurality of light boxes. Each light box includes a plurality of light boards. Each light board includes a plurality of display pixels. The driver circuit is coupled to the display screen. The driver circuit is used to drive the display screen to display an image. The driver circuit performs a first compensation operation on the display screen according to first compensation data, and the first compensation data is calculated based on the light board. The driver circuit performs a second compensation operation on the display screen according to second compensation data, and the second compensation data is calculated based on pixels.

[0005] The display device of the embodiment of the present disclosure includes a display screen. The display screen includes a plurality of light boxes. The light boxes include a plurality of light boards. Each light board includes a plurality of display pixels. The compensation method of the display device of the embodiment of the present disclosure includes: performing a first compensation operation on the display screen according to first compensation data, wherein the first compensation data is calculated based on the light boards; and performing a second compensation operation on the display screen according to second compensation data, wherein the second compensation data is calculated based on pixels.

[0006] In order to more easily understand the features and advantages of the present disclosure, the following specific embodiments are described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A block diagram of a display device according to an embodiment of the present disclosure is shown.

[0008] Figure 2 Show Figure 1 A schematic side view of a display screen according to an embodiment.

[0009] Figure 3 A schematic diagram showing a correction scenario according to an embodiment of the present disclosure.

[0010] Figure 4 Show Figure 3 A flowchart of a compensation method for a display device according to an embodiment.

[0011] Figure 5 A flowchart showing a compensation method for a display device according to another embodiment.

[0012] Figure 6 A flowchart showing a compensation method for a display device according to another embodiment.

[0013] Figure 7 A schematic diagram showing a correction system including a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0014] The term "coupling (coupling) (or connection (connection))" used in the specification (including claims) of the present disclosure may refer to any direct connection means or indirect connection means. For example, if the first device is described as being coupled (or connected) to the second device, it should be interpreted that the first device can be directly connected to the second device or the first device can be indirectly connected to the second device via another device or a specific connection means. The terms such as "first" and "second" mentioned in the entire specification (including claims) of the present disclosure are used to name or distinguish different embodiments or scopes for elements, rather than to limit the upper or lower limits of the number of elements or to limit the order of elements. In addition, the elements / components / steps and embodiments using the same reference numbers in the drawings represent the same or similar parts as much as possible. The relevant descriptions of the elements / components / steps using the same reference numbers or the same terms in different embodiments can be cross-referenced.

[0015] Figure 1 A block diagram of a display device according to an embodiment of the present disclosure is shown. Figure 2 Show Figure 1 A schematic side view of a display screen of an embodiment. Please refer to Figure 1 and Figure 2 The display device 100 includes a driver circuit 110 and a display screen 120. The driver circuit 110 is used to drive the display screen 120 to display an image. The display screen 120 includes a plurality of light boxes 200. Each light box 200 includes a plurality of light panels 210. Each light panel 210 includes a plurality of display pixels. The driver circuit 110 is coupled to the display screen 120.

[0016] Specifically, the display screen 120 is, for example, a large LED display screen made by SMD packaging technology or COB packaging technology, and is composed of a plurality of light boxes 200 arranged and combined in an array. The present disclosure does not limit the packaging method of the display screen 120. Each light box 200 can be divided into a plurality of light boards (hereinafter referred to as LED light boards) 210, and each LED light board 210 includes an LED array. Each display pixel (hereinafter referred to as LED pixel) can include an LED element.

[0017] In the present embodiment, the driver circuit 110 includes, for example, a plurality of display driver chips. Each LED light board 210 may be configured with one or more display driver chips, and the one or more display driver chips are used to drive the LED light board to display a corresponding image screen. For example, for the same LED light board 210, the display driver chip may generate a corresponding drive signal according to the image data to drive the LED pixels therein, and the same LED light board 210 may be set to have the same signal gain value. The display driver chip generates a drive signal according to the signal gain value to drive the pixels in the LED light board. For example, the signal used to drive the LED pixels is, for example, a current, and therefore, the signal gain value may be a current gain value.

[0018] In this embodiment, the entire display screen 120 may be composed of a plurality of light boxes 200, and each light box is composed of a plurality of LED light panels 210. The display images of each LED light panel 210 may be slightly different, so if this difference is not corrected, it is easy to produce a boundary on the display image of the same light box, resulting in an uneven display image. In addition, if the display image of the entire display screen 120 appears uneven, such unevenness may be: uneven brightness or chromaticity between the light boxes on the display screen, uneven brightness or chromaticity between the LED light panels in the light box, or uneven brightness or chromaticity of the LED pixels on the LED light panel.

[0019] Therefore, in order to improve the display quality of the display screen 120, in the embodiment of the present disclosure, the signal gain value or image data of the LED light board 210 can be compensated first to improve the overall brightness uniformity or color uniformity of the display screen 120, as described below.

[0020] Figure 3 A schematic diagram showing a correction scenario according to an embodiment of the present disclosure. Figure 4 Show Figure 3 A flow chart of a compensation method for a display device according to an embodiment of the present invention. Figure 1 , Figure 3 and Figure 4In step S100, the host system 310 uses a colorimeter or a camera (image capture device) 320 to obtain the light board information of each LED light board 210, wherein the light board information includes, for example, the brightness value or chromaticity value of each LED light board 210, thereby knowing the overall brightness uniformity or chromaticity uniformity of the display screen 120. Next, the host system 310 calculates a signal gain compensation value (first compensation data) based on the light board according to the obtained light board information. The signal gain compensation value can be stored in the storage circuit of the host system 310 or the driver circuit 110, and the present disclosure is not limited thereto. "Based on the light board" means that the host system 310 calculates the corresponding signal gain compensation value for each LED light board 210 based on the light board as a unit.

[0021] Therefore, the signal gain value of each LED light board 210 can be adjusted according to the signal gain compensation value. When driving each LED light board 210, the driver circuit 110 can generate a driving signal (first compensation operation) according to the adjusted signal gain value to drive each LED light board 210. In this way, by adjusting the signal gain value of each LED light board 210, the brightness difference or chromaticity difference between each light board can be reduced.

[0022] In the present embodiment, the host system 310, for example, calculates different signal gain compensation values ​​for each LED light board 210 when displaying red, green and blue. For example, before compensation, the signal gain value of the LED light board 210 is (Gr, Gg, Gb), which is used to generate signals (such as current) for driving the LED light board 210 to display red, green and blue, respectively, where Gr, Gg, and Gb are positive values. The host system 310 can calculate the signal gain compensation values ​​(dGr, dGg, dGb) corresponding to red, green and blue through step S100, where dGr, dGg, and dGb can be positive or negative values. If the LED light board 210 is too bright, the signal gain compensation value can be a negative value; if the LED light board 210 is too dark, the signal gain compensation value can be a positive value. Therefore, the adjusted signal gain value is (Gr+dGr, Gg+dGg, Gb+dGg). The driver circuit 110 may generate signals for driving the LED light board 210 to display red, green, and blue according to the adjusted signal gain values ​​(Gr+dGr, Gg+dGg, Gb+dGg).

[0023] In this embodiment, the signal gain values ​​of each LED light board 210 before and after adjustment may be the same or different, and the present disclosure is not limited thereto.

[0024] Next, in step S110, the host system 310 uses the camera 320 to obtain the brightness information of each LED pixel. The host system 310 usually obtains the brightness information of multiple grayscales. Then, the host system 310 calculates the brightness compensation value (second compensation data) on a pixel basis according to the brightness information of each grayscale. The brightness compensation values ​​of the remaining grayscales for which the brightness information is not obtained can be calculated by interpolation. The calculation method of the brightness compensation value can be implemented by a calculation method well known in the art. The brightness compensation value is used to compensate the brightness data in the image data. Therefore, using the compensated brightness data to drive the LED pixels can make the overall brightness of the display screen 120 more uniform. The brightness compensation value can be stored in the storage circuit of the host system 310 or the driver circuit 110, and the present disclosure is not limited thereto. "On a pixel basis" means that the host system 310 calculates the corresponding brightness compensation value for each LED pixel with pixels as units.

[0025] Therefore, when driving each LED pixel, the driver circuit 110 can adjust the brightness data of each LED pixel according to the brightness compensation value, and drive each LED pixel according to the adjusted brightness data (second compensation operation). In this way, by adjusting the brightness data of each LED pixel, the overall brightness of the display screen 120 can be made more uniform.

[0026] Subsequently, in step S120, the host system 310 uses the camera 320 to obtain the chromaticity information of each LED pixel. Next, the host system 310 calculates the chromaticity compensation value (third compensation data) on a pixel basis according to the chromaticity information, and the calculation method includes, for example, using matrix calculation to perform color gamut conversion. The calculation method of the chromaticity compensation value can be implemented using a calculation method well known in the art. The chromaticity compensation value is used to compensate for the chromaticity data in the image data. Therefore, using the compensated chromaticity data to drive the LED pixels can make the overall chromaticity of the display screen 120 more uniform. The chromaticity compensation value can be stored in the storage circuit of the host system 310 or the driver circuit 110, and the present disclosure is not limited thereto. "On a pixel basis" means that the host system 310 calculates the corresponding chromaticity compensation value for each LED pixel using pixels as units.

[0027] Therefore, when driving each LED pixel, the driver circuit 110 can adjust the chromaticity data of each LED pixel according to the chromaticity compensation value, and drive each LED pixel according to the adjusted chromaticity data (third compensation operation). In this way, by adjusting the chromaticity data of each LED pixel, the overall chromaticity of the display screen 120 can be made more uniform.

[0028] In this embodiment, the host system 310 first adjusts the signal gain value of each LED light board to reduce the brightness or chromaticity difference between the light boards. In this way, during the subsequent brightness calibration and chromaticity calibration, the display screen 120 will display a smoother picture. Therefore, the final calibration result is less likely to have brightness or chromaticity differences between light boxes or light boards.

[0029] In addition, in this embodiment, the host system 310 first performs brightness correction (step S110) so that the subsequent chromaticity correction (step S120) can be maintained in a linear range for calculation, so that the chromaticity compensation value used for correction can be closer to the ideal value, but the present disclosure is not limited to this. In an embodiment, chromaticity correction can also be performed before brightness correction. In an embodiment, brightness correction and chromaticity correction can also be performed selectively.

[0030] Figure 5 A method flow chart showing a compensation method for a display device according to another embodiment. Figure 1 , Figure 3 and Figure 5 In step S210, the host system 310 issues an instruction to control the display screen 120 to display a light-up picture. In step S210, the way to light up the picture is, for example, the host system 310 provides a front-end image or uses a built-in image of the driver circuit 110 to drive the display screen 120 to display a light-up picture. In step S212, the host system 310 issues an instruction to control the camera 320 to shoot or the colorimeter to measure the picture. In step S214, the host system 310 calculates a signal gain compensation value based on the LED light board information. In step S216, the host system 310 writes the signal gain compensation value into the flash memory of the driver circuit 110. In step S218, the driver circuit 110 drives the LED light board according to the signal gain compensation value to correct the brightness or chromaticity difference of the display screen 120. Step S218 can be executed by a data driver in the driver circuit 110, for example, but the present disclosure is not limited thereto.

[0031] Next, in step S220, the host system 310 issues an instruction to control the display screen 120 to display a light-up picture. In step S222, the host system 310 issues an instruction to control the camera 320 to shoot a picture. In step S224, the host system 310 calculates a brightness compensation value based on the LED pixel information. In step S226, the host system 310 writes the brightness compensation value into the flash memory of the driver circuit 110. In step S228, the driver circuit 110 drives the LED pixels according to the brightness compensation value to correct the brightness difference of the display screen 120. Step S228 can be performed, for example, by a timing controller in the driver circuit 110 or a timing controller outside the driver circuit 110, but the present disclosure is not limited thereto. The driver circuit 110 of the embodiment of the present disclosure may or may not include a timing controller.

[0032] Then, in step S230, the host system 310 gives an instruction to control the display screen 120 to display the light-up picture. In step S232, the host system 310 gives an instruction to control the camera 320 to shoot the picture. In step S234, the host system 310 calculates the chromaticity compensation value according to the LED pixel information. In step S236, the host system 310 writes the chromaticity compensation value into the flash memory of the driver circuit 110. In step S238, the driver circuit 110 drives the LED pixel according to the chromaticity compensation value to correct the chromaticity difference of the display screen 120. Step S238 can be executed by, for example, a timing controller in the driver circuit 110, but the present disclosure is not limited thereto.

[0033] Figure 5 The compensation method of the display device of the embodiment can be performed by Figures 1 to 4 Sufficient teachings, suggestions and implementation instructions are obtained from the description of the embodiments of the present invention, so they are not repeated here.

[0034] Figure 6 A method flow chart showing a compensation method for a display device according to another embodiment. Figure 1 , Figure 3 and Figure 6 In step S300, the driver circuit 110 performs a first compensation operation on the display screen 120 according to the first compensation data calculated based on the light board. In this embodiment, the compensation method of the display device may further include shooting a first image displayed by the display screen 120 through the image capture device 320, and the host system 310 calculates the first compensation data based on the first image based on the light board.

[0035] In step S310, the driver circuit 110 performs a second compensation operation on the display screen 120 according to the second compensation data calculated on a pixel basis. In this embodiment, the compensation method of the display device may further include photographing a second image displayed by the display screen 120 through the image capture device 320, and the host system 310 calculates the second compensation data on a pixel basis according to the second image. In this embodiment, the second compensation operation is performed after the first compensation operation.

[0036] In an embodiment, the compensation method of the display device may further include photographing a third image displayed by the display screen 120 through the image capture device 320, and the host system 310 calculates third compensation data based on the third image based on pixels. The driver circuit 110 performs a third compensation operation on the display screen 120 according to the third compensation data calculated based on pixels. The third compensation operation is performed after the second compensation operation. The second compensation operation may be one of a brightness compensation operation and a chromaticity compensation operation, and the third compensation operation may be the other of the brightness compensation operation and the chromaticity compensation operation.

[0037] Figure 6 The compensation method of the display device of the embodiment can be performed by Figures 1 to 5 Sufficient teachings, suggestions and implementation instructions are obtained from the description of the embodiments of the present invention, so they are not repeated here.

[0038] Figure 7 A schematic diagram showing a correction system including a display device according to an embodiment of the present disclosure is shown. Figure 7 The calibration system 700 includes an electronic computing device 710 , a display screen 720 , and an image capturing device 730 . The display screen 720 includes a plurality of light boxes 722 , and each light box 722 includes a storage device 721 .

[0039] The electronic computing device 710 is, for example, an electronic device with computing functions such as a computer. The image capturing device 730 can be, for example, a camera or a colorimeter, which can be used to capture the image displayed on the display screen 720. The storage device 721 is, for example, a flash memory that can be read and written multiple times.

[0040] The electronic computing device 710 can control the image capture device 730 to obtain an image of the display screen 720, wherein the image of the display screen 720 can be composed of a single photo or multiple photos. The electronic computing device 710 receives the image of the display screen 720 captured by the image capture device 730, and assembles these images into an image corresponding to the image displayed on the display screen 720.

[0041] The electronic computing device 710 can calibrate the display image of the display screen 720 according to the image correction program stored therein. The electronic computing device 710 can execute the image correction program to calculate a first compensation value. The first compensation value can make the display of each light box 722 on the display screen 720 uniform. After recording the first compensation value of each light box 722, the electronic computing device 710 will calculate a second compensation value. The second compensation value can make the display pixels on a single light board uniform. Display uniformity includes image parameters such as brightness, chromaticity or color temperature.

[0042] Next, the electronic computing device 730 can write the compensation data of each light box 722 into the storage device 721 via a signal line (e.g., a network line) 740. In an embodiment, the electronic computing device 730 can also write the compensation data of each light box 722 into the storage device 721 wirelessly. The writing method includes but is not limited to writing the first compensation value and the second compensation value into the storage device 721 separately, or mixing the first compensation value and the second compensation value (e.g., weighted calculation) and then writing them into the storage device 721.

[0043] In the embodiment, since the light board may be removed and placed in another light box, but the compensation of the display pixels on the light board may be fixed or valid for a period of time, when the light board is installed in a new light box, the electronic computing device 730 can omit the calculation of the second compensation value. In other words, the electronic computing device 730 can first require each light board to return its second compensation value, and if there is no second compensation value, the electronic computing device 730 will calculate the second compensation value for that light board.

[0044] Figure 7 The compensation method of the display device of the embodiment can be performed by Figures 1 to 6 Sufficient teachings, suggestions and implementation instructions are obtained from the description of the embodiments of the present invention, so they are not repeated here.

[0045] In summary, in the embodiment of the present disclosure, the host system first adjusts the signal gain value of each light board to reduce the brightness or chromaticity difference between the light boards. Then, during the brightness correction and chromaticity correction, the display screen will be smoother, so that the correction result is less likely to have brightness difference or chromaticity difference between light boxes or light boards. Therefore, the compensation method of the display device of the embodiment of the present disclosure can improve the brightness uniformity and chromaticity uniformity of the display screen.

[0046] Although the present disclosure has been disclosed in the embodiments, the embodiments are not intended to limit the present disclosure. Those skilled in the art may make some changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure should be defined by the attached claims.

Claims

1. A display device, comprising: A display screen, comprising a plurality of light boxes, wherein each of the light boxes comprises a plurality of light panels, and each of the light panels comprises a plurality of display pixels; as well as A driver circuit is coupled to the display screen and is used to drive the display screen to display an image. The driver circuit performs a first compensation operation on the display screen according to first compensation data, and the first compensation data is calculated based on the light board, and the driver circuit performs a second compensation operation on the display screen according to second compensation data, and the second compensation data is calculated based on pixels. 2 . The display device according to claim 1 , wherein the first compensation data comprises a signal gain compensation value. 3 . The display device according to claim 1 , wherein the second compensation operation is performed after the first compensation operation.

4. The display device according to claim 1, wherein The image capture device captures a first image frame displayed on the display screen, and the host system calculates the first compensation data according to the first image frame based on the light board. The display device according to claim 1 , wherein the second compensation data comprises one of a brightness compensation value and a chromaticity compensation value. 6 . The display device according to claim 5 , wherein the driver circuit performs a third compensation operation on the display screen according to third compensation data, and the third compensation data is calculated on a pixel basis. 7 . The display device according to claim 6 , wherein the third compensation data comprises the other of the brightness compensation value and the chromaticity compensation value. 8 . The display device according to claim 6 , wherein the third compensation operation is performed after the second compensation operation.

9. The display device according to claim 6, wherein An image capture device captures a second image frame displayed on the display screen, and a host system calculates the second compensation data based on the second image frame on a pixel basis; and The image capture device captures a third image frame displayed on the display screen, and the host system obtains the third compensation data based on the third image frame on a pixel basis.

10. The display device according to claim 1, wherein each of the display pixels comprises a light emitting diode element.

11. A compensation method for a display device, wherein the display device comprises a display screen, the display screen comprises a plurality of light boxes, the plurality of light boxes comprise a plurality of light panels, and each of the light panels comprises a plurality of display pixels, the compensation method comprising: Performing a first compensation operation on the display screen according to first compensation data, wherein the first compensation data is calculated based on a light board; as well as A second compensation operation is performed on the display screen according to second compensation data, wherein the second compensation data is calculated on a pixel basis. 12 . The compensation method of a display device according to claim 11 , wherein the first compensation data comprises a signal gain compensation value. 13 . The compensation method of a display device according to claim 11 , wherein the second compensation operation is performed after the first compensation operation.

14. The compensation method for a display device according to claim 11, further comprising: Capturing a first image displayed on the display screen; as well as The first compensation data is calculated according to the first image frame based on the light board. 15 . The compensation method of a display device according to claim 11 , wherein the second compensation data comprises one of a brightness compensation value and a chromaticity compensation value.

16. The compensation method for a display device according to claim 15, further comprising: A third compensation operation is performed on the display screen according to third compensation data, wherein the third compensation data is calculated on a pixel basis. 17 . The compensation method of a display device according to claim 16 , wherein the third compensation data comprises the other of the brightness compensation value and the chromaticity compensation value. 18 . The compensation method of a display device according to claim 16 , wherein the third compensation operation is performed after the second compensation operation.

19. The compensation method of the display device according to claim 16, further comprising: photographing a second image displayed on the display screen; as well as The second compensation data is calculated based on the second image frame on a pixel basis.

20. The compensation method of the display device according to claim 19, further comprising: photographing a third image displayed on the display screen; as well as The third compensation data is calculated based on the third image frame on a pixel basis.

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