TWI840116B - Display device and display method - Google Patents

Abstract

A display and a display method are provided. The display device includes a display panel and a video compensation module. The display panel includes a pixel array and a temperature detector. The temperature detector generates a detected temperature when the pixel array displays a first image. The video compensation module receives resource data arrays corresponding to a second image. The video compensation module includes a pre-processing module and a grayscale-to-temperature transformation module. The pre-processing module transforms the resource data arrays into a grayscale data array. The grayscale-to-temperature transformation module transforms the grayscale data array into a temperature estimation data array. The pixel array displays the second image according to the temperature estimation data array and the resource data arrays.

Description

Display device and display method

The present invention relates to a display device and a display method, and in particular to a display device and a display method that dynamically compensates data voltage as temperature changes.

With the maturity and evolution of light emitting diode (LED) technology, display devices using micro light emitting diode (μLED) are becoming more and more popular. However, the characteristics of μLED are affected by temperature, which may cause color difference when the μLED display panel displays the picture, affecting the user's visual experience.

Please refer to Figure 1A, which is a schematic diagram of a display panel with μLED. The display panel includes a substrate 10 and a pixel array. The pixel array displays a screen according to the control of the control module 15. The pixel array includes pixels PXL(1,1)~PXL(I,J) arranged in I rows and J columns. I and J are positive integers, and I and J change with the resolution of the display panel.

Pixels PXL(1,1)~PXL(I,J) are all μLEDs, and each pixel PXL(1,1)~PXL(I,J) includes a red sub-pixel rsPXL, a green sub-pixel gsPXL, and a blue sub-pixel bsPXL. For example, pixel PXL(1,1) includes a red sub-pixel rsPXL(1,1), a green sub-pixel gsPXL(1,1), and a blue sub-pixel bsPXL(1,1). For ease of explanation, this article uses a vertical grid to represent the components and data related to the red sub-pixel rsPXL, a horizontal grid to represent the components and data related to the green sub-pixel gsPXL, and a diagonal grid to represent the components and data related to the blue sub-pixel bsPXL.

When a display device using μLED displays images, the μLEDs may have different temperatures because they are located at different positions on the display panel. As a result, the temperature influence on the characteristics of μLEDs at different positions is also different. Therefore, when the control module 15 transmits the display image to the pixel array, the content actually displayed by the μLED pixels will be affected to varying degrees due to the position and temperature difference of the pixels, thereby affecting the display effect of the image.

In order to reduce the impact of temperature on the μLED display panel, the conventional technology uses multiple temperature detectors to adjust the μLEDs that are affected by temperature changes to varying degrees. However, when temperature sensors are installed on the μLED display panel, the cost of the display panel will also be higher. In order to take into account the needs of temperature compensation and cost considerations, the conventional technology uses several temperature sensors to perform temperature sensing, and uses interpolation to estimate the temperature of pixels that have not been temperature sensed, and then performs data compensation based on the temperature estimation results.

Please refer to FIG. 1B, which is a schematic diagram of using the conventional technology to set multiple temperature sensors on the other side of the display panel with μLED. Temperature sensors 13a, 13b, 13c, and 13d are set at the four corners on the back of the substrate 10. For example, the temperature sensor 13a is set at a position corresponding to the pixel PXL (1, 1); the temperature sensor 13b is set at a position corresponding to the pixel PXL (I, 1); the temperature sensor 13c is set at a position corresponding to the pixel PXL (1, J); and the temperature sensor 13d is set at a position corresponding to the pixel PXL (I, J). The temperature sensors 13a, 13b, 13c, and 13d generate sensing temperatures detT_a, detT_b, detT_c, and detT_d to the control module 15, respectively. In the conventional technology, the control module 15 performs interpolation based on the sensed temperatures detT_a, detT_b, detT_c, and detT_d, thereby generating compensation data corresponding to each μLED pixel in the pixel array. Afterwards, the control module 15 controls the brightness of the μLED pixel based on the compensation data generated by the interpolation.

Please refer to Figure 2, which is a schematic diagram of a source image srcIMG. In this diagram, it is assumed that the source image srcIMG is a cross-shaped pattern. Please refer to Figure 3, which is a display screen generated after compensation using the setting position of the temperature sensor shown in Figure 1B and interpolation calculation. Please also note that in Figures 2 and 3, although multiple blocks are divided by grid lines (arranged in 10 rows and 6 columns), these grid lines are only used to mark the corresponding relationship between blocks and pixels in the screen, and are not the content of the screen.

As can be seen from Figure 3, the color of the block located at the upper left of the display screen is darker, and the color of the block located at the lower right is lighter. Overall, the brightness distribution of the blocks in Figure 3 makes the appearance of the compensated screen cmpIMG generated by the conventional technology completely different from the cross pattern in the source screen srcIMG in Figure 2. Therefore, when the conventional technology is used for screen compensation, the display effect of the compensated screen cmpIMG displayed by the display panel is not ideal.

The present invention relates to a μLED display device and a display method. In view of the fact that μLED is easily affected by temperature and its characteristics, a display device and a display method with data compensation function as the temperature changes are proposed.

According to one aspect of the present invention, a display device is provided. The display device includes: a display panel and a video compensation module. The display panel includes: a pixel array and a temperature sensor. The temperature sensor is set at a temperature sensing position. The pixel array displays a first frame. The temperature sensor generates a sensed temperature corresponding to the temperature sensing position when the pixel array displays the first frame. The video compensation module is electrically connected to the pixel array and the temperature sensor. The video compensation module receives a source data array corresponding to the second frame. The video compensation module includes: a pre-processing module and a grayscale-temperature conversion module. The pre-processing module converts the source data array into a grayscale data array. The grayscale-temperature conversion module is electrically connected to the temperature sensor and the pre-processing module. The grayscale-temperature conversion module converts the grayscale data array into an estimated temperature data array according to the sensed temperature, the temperature difference lookup table and the temperature sensing position. The pixel array displays the second screen according to the estimated temperature data array and the source data array.

According to another aspect of the present invention, a display method is proposed. The display method is applied to a display device including a display panel and a timing controller. The display panel includes a pixel array and a temperature sensor. The display method includes the following steps. The pixel array displays a first frame. The temperature sensor generates a sensed temperature when the pixel array displays the first frame. The timing controller receives a source data array corresponding to a second frame. The timing controller converts the source data array into a grayscale data array. The timing controller converts the grayscale data array into an estimated temperature data array based on the sensed temperature, the temperature difference lookup table, and the temperature sensing position where the temperature sensor is located. The pixel array displays the second frame based on the estimated temperature data array and the source data array.

In order to better understand the above and other aspects of the present invention, the following is a specific example and a detailed description with the attached drawings as follows:

15,33: Control module

PXL(1,1),PXL(I,1),PXL(1,J),PXL(I,J),PXL(i,j),PXL,PXL(2,1)~PXL(10,1),PXL(1,2)~PXL(10,6):pixels

rsPXL(1,1),rsPXL(I,1),rsPXL(1,J),rsPXL(I,J),rsPXL(i,j): red sub-pixel

gsPXL(1,1),gsPXL(I,1),gsPXL(1,J),gsPXL(I,J),gsPXL(i,j): green sub-pixel

bsPXL(1,1),bsPXL(I,1),bsPXL(1,J),bsPXL(I,J),bsPXL(i,j): blue sub-pixel

10,30,30a,30c,30e: Substrate

13a,13b,13c,13d,313,313a,313c,313e: Temperature sensor

detT_a,detT_b,detT_c,detT_d,detT,detT(t):Sensing temperature

srcIMG,srcIMG(t): source image

cmpIMG: Screen after compensation

3: Display device

31,31a,31c,31e: Display panel

311,311a,311c,311e: Pixel array

SL[1],SL[i],SL[I]: Source line (signal)

GL[1],GL[j],GL[J]: Gate line (signal)

Sctl_gate: gate control signal

Sctl_src: source control signal

331: Gate control circuit

333: Source control circuit

335,43: Storage circuit

337: Timing controller

337a,41: Video compensation module

337c: Digital Gamma Circuit

bsPnt(x_bs,y_bs): Temperature sensing position

srcArr_r(I*J),srcArr_r(t): red source data array

srcR(1,1)~srcR(10,6),srcR(i,j): red source data element

srcArr_g(I*J),srcArr_g(t): Green source data array

srcG(1,1)~srcG(10,6),srcG(i,j): green source data element

srcArr_b(I*J),srcArr_b(t): blue source data array

srcB(1,1)~srcB(10,6),srcB(i,j): blue source data element

smfltMTX: smoothing coefficient matrix

diffDatLUT: Data difference lookup table

△TLUT: Temperature difference lookup table

411: Data aggregation module

413: Difference generation module

414: Smoothing module

415: Grayscale-temperature conversion module

4151: Temperature estimation module

4153: Temperature difference conversion module

4155: Grayscale difference calculation module

417: Preprocessing module

4171:Pixel reduction module

4173: Channel reduction module

△datR(i,j),△datR(1,1)~△datR(10,6),△datR(i,j)(t): red compensation data elements

△datG(i,j),△datG(1,1)~△datG(10,6),△datG(i,j)(t): Green compensation data elements

△datB(i,j),△datG(1,1)~△datG(10,6),△datB(i,j)(t): blue compensation data elements

sumR(i,j),sumR(i,j)(t): red summed data elements

sumG(i,j),sumG(i,j)(t): Green summed data elements

sumB(i,j),sumB(i,j)(t): blue summed data elements

smTArr(M*N),smTArr(t): smoothed temperature data array

estTArr(M*N),estTArr(t): Estimated temperature data array

△TArr(M*N),△TArr(t): Temperature difference data array

△gsArr(M*N),△gsArr(t): grayscale difference data array

gsArr(M*N),gsArr(t): grayscale data array

dsArr_r(M*N),dsArr_r(t): Red downsampled data array

dsArr_g(M*N),dsArr_g(t): Green downsampled data array

dsArr_b(M*N),dsArr_b(t): blue downsampled data array

dsD_r(1,1)~dsD_r(5,3): Red downsampling data element

dsD_g(1,1)~dsD_g(5,3): Green downsampling data element

dsD_b(1,1)~dsD_b(5,3): blue down-sampling data element

gsD(1,1)~gsD(5,3): grayscale data elements

gsD_bs,gsD_bs(t):base grayscale value

△gsD(1,1)~△gsD(5,3): grayscale difference data element

△T(1,1)~△T(5,3): Temperature difference data element

estT(1,1)~estT(5,3): Estimated temperature data element

smT(1,1)~smT(5,3): Smoothed temperature data element

inT(1,1)~inT(10,6): interpolated temperature data elements

FM1, FM2, FM3: Dashed frame selection

dspIMG(t),dspIMG(t-△t),dspIMG(I*J): display screen

FIG. 1A is a schematic diagram of a display panel with μLEDs; FIG. 1B is a schematic diagram of a display panel with μLEDs having multiple temperature sensors disposed on another side of the display panel with μLEDs using conventional technology; FIG. 2 is a schematic diagram of a source image srcIMG. In this diagram, it is assumed that the source image srcIMG is a cross-shaped pattern; FIG. 3 is a compensation image cmpIMG generated by performing temperature compensation using the temperature sensor arrangement positions shown in FIG. 1B and interpolation calculation after the μLED display panel using conventional technology receives the source image srcIMG of FIG. 2; FIG. 4A is a schematic diagram of a display device according to the present disclosure; and FIG. 4B is a diagram of a display device according to the present disclosure. FIG. 5A is a schematic diagram of a single temperature sensor disposed on a display panel according to the disclosed concept; FIG. 5B is a side view of a pixel array and a single temperature sensor disposed on the same side of a display panel according to the disclosed concept; FIG. 5C is a side view of a single temperature sensor embedded in a pixel array and a substrate adjacent to the substrate according to the disclosed concept A side view of the sensor; Figure 6 is a schematic diagram of a pixel array; Figure 7A is a schematic diagram of a red source image srcIMG_r represented by red source data elements srcR(1,1)~srcR(I,J) of a red source data array srcArr_r(I*J); Figure 7B is a schematic diagram of a green source data array srcArr_g(I*J) representing a green source data element src G(1,1)~srcG(I,J), represents a schematic diagram of a green source image srcIMG_g; FIG. 7C is a schematic diagram of a blue source data element srcB(1,1)~srcB(I,J) of a blue source data array srcArr_b(I*J), representing a blue source image srcIMG_b; FIG. 8 is a block diagram of a video compensation module according to the present disclosure; FIG. 9 FIG. A is a schematic diagram of a red downsampled data array dsArr_r(M*N) generated by downsampling the red source data elements srcR(1,1)~srcR(10,6) of the red source data array srcArr_r(I*J) of FIG. 7A; FIG. 9B is a schematic diagram of a red downsampled data array dsArr_r(M*N) generated by downsampling the blue data elements srcG( FIG. 9C is a schematic diagram of a green downsampled data array dsArr_g(M*N) generated after downsampling the blue data elements srcB(1,1)~srcB(10,6) of the blue source data array srcArr_b(I*J) of FIG. 7C ; FIG. 9C is a schematic diagram of a blue downsampled data array dsArr_g(M*N) generated after downsampling the blue data elements srcB(1,1)~srcB(10,6) of the blue source data array srcArr_b(I*J) of FIG. 7C . ) is a schematic diagram; FIG. 10 is a schematic diagram of a grayscale data array gsArr(M*N) generated after grayscale conversion based on the red downsampled data array dsArr_r(M*N) of FIG. 9A, the green downsampled data array dsArr_g(M*N) of FIG. 9B, and the blue downsampled data array dsArr_b(M*N) of FIG. 9C; FIG. 11 is a schematic diagram of a grayscale data array gsArr(M*N) generated after grayscale conversion based on the red downsampled data array dsArr_r(M*N) of FIG. 9A, the green downsampled data array dsArr_g(M*N) of FIG. 9B, and the blue downsampled data array dsArr_b(M*N) of FIG. 9C; The grayscale value corresponding to bsPnt(x_bs,y_bs) is defined as a schematic diagram of the reference grayscale value gsD_bs; Figure 12 is a schematic diagram of calculating the grayscale difference data array △gsArr(M*N) based on the grayscale data array gsArr(M*N) and the reference grayscale value gsD_bs in Figure 10; Figure 13 is a schematic diagram of calculating the grayscale difference data array △gsArr(M*N) based on the temperature difference lookup table △TLUT FIG. 14 is a schematic diagram of converting the sensed temperature detT and the temperature difference data array △TArr(M*N) into the temperature difference data array △TArr(M*N); FIG. 15 is a schematic diagram of smoothing the estimated temperature data array estTArr(M*N) using a smoothing filter. FIG16 is a schematic diagram of the smoothed temperature data array smTArr(M*N) generated after the difference generation module interpolates the smoothed temperature data array smTArr(M*N) in the interpolation stage to generate I*J interpolated temperature data elements inT(1,1)~inT(I,J); FIG17A~17C are schematic diagrams of the difference generation module in the difference compensation stage, respectively based on The red source data elements srcR(1,1)~srcR(I,J), the green source data elements srcG(1,1)~srcG(I,J), the blue source data elements srcB(1,1)~srcB(I,J) and the interpolated temperature data elements inT(1,1)~inT(I,J) are combined with the data difference lookup table diffDatLUT to generate the red compensation data. FIG18A is a schematic diagram of the red source data elements srcR(1,1)~△datR(I,J), the green compensation data elements △datG(1,1)~△datG(I,J), and the blue compensation data elements △datB(1,1)~△datB(I,J); FIG18A is a schematic diagram of the red source data elements srcR(1,1)~srcArr_r(I*J) of FIG7A. rcR(I,J) is combined with the red compensation data elements △datR(1,1)~△datR(I,J) in Figure 17A to generate the red summed data elements sumR(i,j)(i=1~I,j=1~J); Figure 18B is a diagram of the green source data elements srcG(1,1)~srcG of the green source data array srcArr_g(I*J) in Figure 7B. (I,J) is combined with the green compensation data elements △datG(1,1)~△datG(I,J) in Figure 17B to generate the green summed data elements sumG(i,j)(i=1~I, j=1~J); Figure 18C is a diagram of the blue source data elements srcB(1,1)~srcB(I ,J) is a schematic diagram of the blue summed data element sumB(i,j)(i=1~I, j=1~J) generated by combining the blue compensation data elements datB(1,1)~△datB(I,J) of FIG. 17C; FIG. 19 is a schematic diagram of the relationship between the various types of data in this case; and FIG. 20 is a schematic diagram of the μLED display panel receiving the source image srcIMG of FIG. 2 and combining it with the present disclosure. The proposed video compensation module generates the red summed data element sumR(i,j)(i=1~I, j=1~J) in Figure 18A, the green summed data element sumG(i,j)(i=1~I, j=1~J) in Figure 18B, and the blue summed data element sumB(i,j)(i=1~I, j=1~J) in Figure 18C, and combines them to display the display screen dspIMG.

Please refer to Figure 4A, which is a schematic diagram of a display device according to the present disclosure. The display device 3 includes: a display panel 31 and a control module 33.

The display panel 31 includes a temperature sensor 313 and a pixel array 311. The pixel array 311 includes pixels PXL(1,1)~PXL(I,J) arranged in I rows and J columns. The pixels PXL(1,1~J)~PXL(I,1~J) located in each I row are electrically connected to I source lines SL[1]~SL[I]. The pixels PXL(1~I,1)~PXL(I~I,J) located in each J column are electrically connected to J gate lines GL[1]~GL[J].

The pixel array 311 is disposed on one side of the display panel 31. Depending on the embodiment, the temperature sensor 313 and the pixel array 311 may be disposed on the same side of the substrate, disposed on both sides of the substrate, or the temperature sensor 313 may be embedded in the substrate. Moreover, the position of the temperature sensor 313 on the x-y plane of the substrate does not need to be limited. For example, the position of the temperature sensor 313 on the x-y plane may correspond to the position of the pixel PXL(1,1); or, the position of the temperature sensor 313 on the x-y plane may correspond to the position of the pixel PXL(I,J). In this article, it is assumed that the position of the temperature sensor 313 on the x-y plane roughly corresponds to the position of the pixel PXL(I/2,J/2). That is, it is assumed that the temperature sensor 313 corresponds to the center position of the pixel array 31.

The control module 33 includes: a gate control circuit 331, a source control circuit 333, a storage circuit 335 and a timing controller 337. Depending on the application, the storage circuit 335 can also be set in the timing controller 337.

The timing controller 337 is electrically connected to the gate control circuit 331, the source control circuit 333, the storage circuit 335 and the temperature sensor 313. The timing controller 337 further includes: a digital gamma circuit 337c and a video compensation module 337a. The video compensation module 337a receives the source image srcIMG from the outside and receives the sensed temperature 313 from the temperature sensor 313. After the video compensation module 337a performs compensation processing on the source image srcIMG, the compensation result is output to the digital gamma circuit 337c. The digital gamma circuit 337c then generates a source control signal Sctl_src to the source control circuit 333 according to the compensation result transmitted by the video compensation module 337a. In addition, the timing controller 337 generates a gate control signal Sctl_gate to the gate control circuit 331

The gate control circuit 331 is electrically connected to J gate lines GL[1]~GL[J]. The gate control circuit 331 generates gate signals GL[1]~GL[J] in response to the gate control signal Sctl_gate. The source control circuit 333 is electrically connected to I source lines SL[1]~SL[I]. The source control circuit 333 generates source signals SL[1]~SL[I] in response to the source control signal Sctl_src. The design and operation of the digital gamma circuit 337c, the gate control circuit 331 and the source control circuit 333 are not described in detail here.

Please refer to Figure 4B, which is a schematic diagram of setting a single temperature sensor on a display panel according to the concept of the present disclosure. The present disclosure only requires the use of a single temperature sensor 313, and, depending on the embodiment, the temperature sensor 313 can be set on the substrate 30 on the same side or the opposite side of the display array, or the temperature sensor 313 can be embedded in the substrate 30. The position of the temperature sensor 313 on the x-y plane where the substrate 30 is located is referred to as the temperature sensing position bsPnt, and is expressed in a coordinate format (x_bs, y_bs). The temperature sensing position bsPnt (x_bs, y_bs) corresponds to the range of the active area of the substrate 30.

According to the concept disclosed herein, the location of the temperature sensor on the display panel structure is a variation in application and does not need to be limited. Below, Figures 5A, 5B, and 5C are used as examples to illustrate several possible locations for the temperature sensor.

Please refer to Figure 5A, which is a side view of a pixel array and a single temperature sensor disposed on both sides of a display panel according to the concept of the present disclosure. The display panel 31a includes a substrate 30a, a pixel array 311a and a temperature sensor 313a. In Figure 5A, the pixel array 311a is located on one side of the substrate 30a; the temperature sensor 313a is located on the other side of the substrate 30a.

Please refer to Figure 5B, which is a side view of a pixel array and a single temperature sensor disposed on the same side of a display panel according to the concept of the present disclosure. The display panel 31c includes a substrate 30c, a pixel array 311c and a temperature sensor 313c. In Figure 5B, the pixel array 311c and the temperature sensor 313c are both located on the same side of the substrate 30c.

Please refer to Figure 5C, which is a side view of a single temperature sensor embedded in the adjacent side of the pixel array and the substrate according to the concept of the present disclosure. The display panel 31e includes a substrate 30e, a pixel array 311e and a temperature sensor 313e. Among them, the pixel array 311e is located on one side of the substrate 30e, and the temperature sensor 313e is embedded in the substrate 30e. In Figure 5C, it is assumed that the position where the temperature sensor 313e is embedded in the substrate 30e is directly adjacent to the pixel array 311e. In actual application, the position where the temperature sensor 313e is embedded in the substrate 30e may also be somewhat spaced from the pixel array 311e, or embedded on the opposite side of the pixel array 311e.

As can be seen from Figures 5A, 5B, and 5C, according to the concept of the present disclosure, the location of the temperature sensor is quite flexible. The following will explain how to determine how to compensate for the temperature-affected pixel characteristics based on the sensing results of the temperature sensor according to the concept of the present disclosure. For ease of explanation, in the following embodiments, it is assumed that I=10 and J=6. However, in actual applications, the values of I and J do not need to be limited. In addition, this article uses parentheses after the symbol representing the data array to indicate the number of data elements (data entry) contained in the data array.

Please refer to Figure 6, which is a schematic diagram of a pixel array. The pixel array 311 includes pixels PXL(1,1)~PXL(10,6). For simplicity, it is assumed that each pixel PXL(1,1)~PXL(10,6) corresponds to one of the picture blocks of the source image srcIMG in Figure 2. In actual application, the correspondence between pixels and picture blocks is not limited to this.

The data of the source image srcIMG includes: red source image srcIMG_r, green source image srcIMG_g, and blue source image srcIMG_b. The red source image srcIMG_r is displayed by the red sub-pixels rsPXL(1,1)~rsPXL(I,J) in the pixel array 311, the green source image srcIMG_g is displayed by the green sub-pixels gsPXL(1,1)~gsPXL(I,J) in the pixel array 311; the blue source image srcIMG_b is displayed by the blue sub-pixels bsPXL(1,1)~bsPXL(I,J) in the pixel array 311.

Please refer to Figure 7A, which is a schematic diagram of the red source image srcIMG_r represented by the red source data elements srcR(1,1)~srcR(I,J) of the red source data array srcArr_r(I*J). The red source data array srcArr_r(I*J) includes I*J=10*6 red source data elements srcR(1,1)~srcR(10,6), which correspond to the red sub-pixels rsPXL(1,1)~rsPXL(10,6) arranged in 10 rows and 6 columns respectively.

Please refer to Figure 7B, which is a schematic diagram of the green source image srcIMG_g represented by the green source data elements srcG(1,1)~srcG(I,J) of the green source data array srcArr_g(I*J). The green source data array srcArr_g(I*J) includes I*J=10*6 green source data elements srcG(1,1)~srcG(10,6), which correspond to the green sub-pixels gsPXL(1,1)~gsPXL(10,6) arranged in 10 rows and 6 columns respectively.

Please refer to Figure 7C, which is a schematic diagram of a blue source image srcIMG_b represented by blue source data elements srcB(1,1)~srcB(I,J) of a blue source data array srcArr_b(I*J). The blue source data array srcArr_b(I*J) includes I*J=10*6 blue source data elements srcB(1,1)~srcB(10,6), which correspond to blue sub-pixels bspXL(1,1)~bsPXL(10,6) arranged in 10 rows and 6 columns, respectively.

Each pixel PXL(i,j)(i=1~10,j=1~6) consists of a red sub-pixel rsPXL(i,j), a green sub-pixel gsPXL(i,j) and a blue sub-pixel bsPXL(i,j). The red sub-pixel rsPXL(i,j), the green sub-pixel gsPXL(i,j) and the blue sub-pixel bsPXL(i,j) correspond to the red source data element srcR(i,j), the green source data element srcG(i,j) and the blue source data element srcB(i,j) respectively.

For example, the pixel PXL(1,1) includes a red sub-pixel rsPXL(1,1), a green sub-pixel gsPXL(1,1), and a blue sub-pixel bsPXL(1,1). The brightness of the red sub-pixel rsPXL(1,1) is determined by the red source data element srcR(1,1) in the red source data array srcArr_r(I*J); the brightness of the green sub-pixel gsPXL(1,1) is determined by the green source data element srcG(1,1) in the green source data array srcArr_g(I*J); and the brightness of the blue sub-pixel bsPXL(1,1) is determined by the blue source data element srcB(1,1) in the blue source data array srcArr_b(I*J). The relationship between the remaining sub-pixels and source data elements is the same and will not be described in detail here.

Please refer to Figure 8, which is a block diagram of a video compensation module according to the present disclosure. The video compensation module 41 includes: a data summing module 411, a difference generation module 413, a smoothing module 414, a grayscale-temperature conversion module 415 and a pre-processing module 417. Among them, the grayscale-temperature conversion module 415 includes: a temperature estimation module 4151, a temperature difference conversion module 4153 and a grayscale difference calculation module 4155. The pre-processing module 417 includes: a pixel reduction module 4171 and a channel reduction module 4173.

Below, we will briefly introduce the purpose of the circuit and module shown in Figure 8, as well as the data transmission and reception relationship between them. For the data format, please refer to the descriptions of Figures 6, 7, 9 to 18.

The source image srcIMG is transmitted to the pixel reduction module 4171, the difference generation module 413 and the data summing module 411. The source image srcIMG includes a red source data array srcArr_r (I*J) (as shown in FIG. 7A), a green source data array srcArr_g (I*J) (as shown in FIG. 7B) and a blue source data array srcArr_b (I*J) (as shown in FIG. 7C).

The pixel reduction module 4171 downsamples the I*J red source data elements srcR(1,1)~srcR(I,J) of the red source data array srcArr_r(I*J). The pixel reduction module 4171 generates a red down-sampled data array drArr_r(M*N) (as shown in FIG. 9A ), down-samples the I*J green source data elements srcG(1,1)~srcG(I,J) of the green source data array srcArr_g(I*J) to generate a green down-sampled data array dsArr_g(M*N) (as shown in FIG. 9B ); and down-samples the I*J blue source data elements srcB(1,1)~srcB(I,J) of the blue source data array srcArr_b(I*J) to generate a blue down-sampled data array dsArr_g(M*N) (as shown in FIG. 9C ). The pixel reduction module 4171 can reduce the amount of data processing, thereby improving the data processing speed.

For ease of explanation, it is assumed here that the pixel reduction module 4171 downsamples I source data elements in the same column to obtain M downsampled data elements, and downsamples J source data elements in the same row to obtain N downsampled data elements. Downsampling coefficients P and Q are defined here. Among them, I=P*M, and J=Q*N. If P and Q are positive integers, the sampling calculation is relatively easy. In actual application, the method and process of downsampling by the pixel reduction module 4171 do not need to be limited.

After receiving the red down-sampling data array drArr_r (M*N), the green down-sampling data array dsArr_g (M*N), and the blue down-sampling data array dsArr_g (M*N) from the pixel down-sampling module 4171, the channel down-sampling module 4173 generates a grayscale data array gsArr (M*N) according to the red down-sampling data array drArr_r (M*N), the green down-sampling data array dsArr_g (M*N), and the blue down-sampling data array dsArr_g (M*N) (as shown in Figures 10 and 11).

The grayscale difference calculation module 4155 obtains the reference grayscale value gsD_bs based on the grayscale data array gsArr(M*N) and the temperature sensing position bsPnt(x_bs,y_bs). Moreover, the grayscale difference data array △gsArr(M*N) is calculated and obtained according to the difference between the reference grayscale value gsD_bs and each element in the grayscale data array gsArr(M*N) (as shown in Figure 12).

The temperature difference conversion module 4153 receives the grayscale difference data array △gsArr(M*N) from the grayscale difference calculation module 4155; receives the sensed temperature detT from the temperature sensor 313; and receives the temperature difference lookup table △TLUT from the storage circuit 43. The temperature difference conversion module 4153 searches for the temperature difference data elements △T(1,1)~△T(M,N) corresponding to the M*N grayscale difference data elements from the temperature difference lookup table △TLUT according to the grayscale difference data array △gsArr(M*N) and the sensed temperature detT, and then generates the temperature difference data array △TArr(M*N) (as shown in Figure 13).

The temperature estimation module 4151 further generates M*N temperature estimation results based on the sensed temperature detT and the temperature difference data array △TArr(M*N). And, these M*N temperature estimation results are used as the estimated temperature data elements of the estimated temperature data array estTArr(M*N) (as shown in Figure 14). Among them, the estimated temperature data element estT(3,2) is the sensed temperature detT. That is, estT(3,2)=detT.

The smoothing module 414 receives the smoothing coefficient matrix smfltMTX from the storage circuit 43 and the estimated temperature data array estTArr(M*N) from the temperature estimation module 4151, and generates a smoothed temperature data array smTArr(M*N) (as shown in FIG. 15 ).

The difference generation module 413 receives the red source data array srcArr_r (I*J) (as shown in FIG. 7A ), the green source data array srcArr_g (I*J) (as shown in FIG. 7B ), and the blue source data array srcArr_b (I*J) (as shown in FIG. 7C ), and the difference generation module 413 receives the data difference lookup table diffDatLUT from the storage circuit 43 and receives the smoothed temperature data array smTArr (M*N) from the smoothing module 414. The difference generation module 413 first interpolates the smoothed temperature data array smTArr (M*N). That is, the smoothed temperature data array smTArr(M*N) containing M*N smoothed temperature data elements smT(1,1)~smT(M,N) is converted into an array containing I*J interpolated temperature data elements inT(1,1)~inT(I,J) (as shown in Figure 16). Afterwards, the difference generation module 413 searches the data difference lookup table diffDatLUT based on the red source data array srcArr_r(I*J), the green source data array srcArr_g(I*J) and the blue source data array srcArr_b(I*J), and the interpolated temperature data elements inT(1,1)~inT(I,J), and converts the red source data array srcArr_r(I*J) into I*J red compensation data elements. △datR(1,1)~△datR(I,J) (as shown in Figure 17A), converting the green source data array srcArr_g(I*J) into I*J green compensation data elements △datG(1,1)~△datG(I,J) (as shown in Figure 17B); and converting the blue source data array srcArr_b(I*J) into I*J blue compensation data elements △datB(1,1)~△datB(I,J) (as shown in Figure 17C).

The data summing module 411 receives the red compensation data elements △datR(1,1)~△datR(I,J), the green compensation data elements △datG(1,1)~△datG(I,J), and the blue compensation data elements △datG(1,1)~△datG(I,J) from the difference generation module 413, and then matches them with the red source data array srcArr_r(I*J), the green source data array srcArr_g(I*J ), blue source data array srcArr_b(I*J) to generate I*J red summed data elements sumR(i,j)(i=1~I, j=1~J)(as shown in FIG. 18A), I*J green summed data elements sumG(i,j)(i=1~I, j=1~J)(as shown in FIG. 18B), and I*J blue summed data elements sumB(i,j)(i=1~I, j=1~J)(as shown in FIG. 18C). The data summing module 411 transmits the red summed data elements sumR(i,j)(i=1~I, j=1~J), the green summed data elements sumG(i,j)(i=1~I, j=1~J), and the blue summed data elements sumB(i,j)(i=1~I, j=1~J) to the digital gamma circuit 337c. Afterwards, the digital gamma circuit 337c generates and transmits the corresponding source control signal Sctl_src to the source control circuit 333 in response to the value of the red summed data element sumR(i,j)(i=1~I, j=1~J), the value of the green summed data element sumG(i,j)(i=1~I, j=1~J), and the value of the blue summed data element sumB(i,j)(i=1~I, j=1~J).

Please also note that based on considerations such as hardware cost and processing efficiency, the video compensation module 337a does not need to wait for I*J red summed data elements sumR(1,1)~sumR(I,J), I*J green summed data elements sumG(1,1)~sumG(I,J), and I*J blue summed data elements sumB(1,1)~sumB(I,J) to be generated before transmitting all the summed data elements to the digital gamma circuit 337c. In practical applications, once the data summing module 411 generates the red summing data element sumR(i,j) that determines the brightness of the red sub-pixel rsPXL(i,j), the green summing data element sumG(i,j) that determines the brightness of the green sub-pixel gsPXL(i,j), and the blue summing data element sumB(i,j) that determines the brightness of the blue sub-pixel bsPXL(i,j), the video compensation Module 337a can transmit the red summed data element sumR(i,j), the green summed data element sumG(i,j), and the blue summed data element sumB(i,j) to the digital gamma circuit 337c individually or in batches, so that the digital gamma circuit 337c can generate the source control signal Sctl_src corresponding to the pixel PXL(i,j) to the source control circuit 333 in real time.

Accordingly, when the pixel array 311 receives source data voltages SL[1]~SL[I] from the source control circuit 333 and gate control signals GL[1]~GL[J] from the gate control circuit 331, the display image dspIMG presented by the pixel array 311 is generated based on the data that has been pre-compensated by the video compensation module 337a.

Please refer to FIG. 9A, which is a schematic diagram of the red down-sampled data array dsArr_r(M*N) generated after down-sampling the red source data elements srcR(1,1)~srcR(10,6) of the red source data array srcArr_r(I*J) of FIG. 7A. For simplicity of explanation, it is assumed here that each red down-sampled data element dsD_r(m,n) (m=1~M, n=1~N) in the red down-sampled data array dsArr_r(M*N) corresponds to 4 adjacent red source data elements srcR(i,j) in the red source data array srcArr_r(I*J). For example, the red downsampled data element dsD_r(1,1) is generated based on the red source data elements srcR(1,1), srcR(2,1), srcR(1,2), srcR(2,2), and so on.

Please refer to FIG. 9B, which is a schematic diagram of a green down-sampled data array dsArr_g(M*N) generated after down-sampling the green source data elements srcG(1,1)~srcG(10,6) of the green source data array srcArr_g(I*J) of FIG. 7B. For simplicity of explanation, it is assumed that each green down-sampled data element dsD_g(m,n) (m=1~M, n=1~N) in the green down-sampled data array dsArr_g(M*N) corresponds to four adjacent green source data elements srcG(i,j) in the green source data array srcArr_g(I*J). For example, the green downsampled data element dsD_g(1,1) is generated based on the green source data elements srcG(1,1), srcG(2,1), srcG(1,2), srcG(2,2), and so on.

Please refer to FIG. 9C, which is a schematic diagram of a blue down-sampled data array dsArr_g(M*N) generated after down-sampling the blue down-sampled data elements srcB(1,1)~srcB(10,6) of the blue source data array srcArr_b(I*J) of FIG. 7C. For simplicity of explanation, it is assumed that each blue down-sampled data element dsD_b(m,n) (m=1~M, n=1~N) in the blue down-sampled data array dsArr_b(M*N) corresponds to four adjacent blue source data elements srcB(i,j) in the blue source data array srcArr_b(I*J). For example, the blue downsampled data element dsD_b(1,1) is generated based on the blue source data elements srcB(1,1), srcB(2,1), srcB(1,2), srcB(2,2), and so on.

After the pixel reduction module 4171 generates the red down-sampling data array dsArr_r (M*N), the green down-sampling data array dsArr_g (M*N), and the blue down-sampling data array dsArr_b (M*N), the channel reduction module 4173 will perform grayscale conversion. Grayscale conversion can further reduce the amount of data in the subsequent data conversion process.

Please refer to FIG. 10, which is a schematic diagram of the grayscale data array gsArr(M*N) generated after grayscale conversion is performed on the red downsampled data array dsArr_r(M*N) of FIG. 9A, the green downsampled data array dsArr_g(M*N) of FIG. 9B, and the blue downsampled data array dsArr_b(M*N) of FIG. 9C. The grayscale data array gsArr(M*N) includes M*N grayscale data elements gsD(1,1)~gsD(M*N). Among them, each grayscale data element gsD(m,n)(m=1~M, n=1~N) is converted from a red source data element srcR(m,n)(m=1~M, n=1~N), a green source data element srcG(m,n)(m=1~M, n=1~N) and a blue source data element srcB(m,n)(m=1~M, n=1~N).

The grayscale conversion relationship of Formula 1 can be used as an example to calculate the grayscale data element gsD(m,n). In actual application, the method of grayscale conversion performed by the channel reduction module 4173 does not need to be limited.

gsD(m , n)=dsD_r(m , n)*Cr+dsD_g(m , n)*Cg+dsD_b(m , n)*Cb...........Formula 1

m

M，且l

n

N。例如，Cr=Cg=Cb=1/3，或者，Cr=0.03、Cg=0.59、Cb=0.11。 In formula 1, Cr, Cg, and Cb are grayscale conversion coefficients,

m

M, and l

n

N. For example, Cr=Cg=Cb=1/3, or Cr=0.03, Cg=0.59, Cb=0.11.

After the channel reduction module 4173 generates the grayscale data array gsArr(M*N), the grayscale difference calculation module 4155 will generate the grayscale difference data array △gsArr(M*N) according to the grayscale data array gsArr(M*N) and the sensed temperature detT. Afterwards, the grayscale difference calculation module 4155 selects the grayscale difference data element △gsD(1,1)~△gsD(M,N) corresponding to the temperature sensing position bsPnt(x_bs,y_bs) as the reference grayscale value gsD_bs (as shown in Figure 11); and calculates the difference between each grayscale data element gsD(1,1)~gsD(M,N) and the reference grayscale value gsD_bs (as shown in Figure 12).

Please refer to Figure 11, which is a schematic diagram of defining the grayscale value corresponding to the temperature sensing position bsPnt (x_bs, y_bs) as the reference grayscale value gsD_bs. As mentioned above, this article assumes that the temperature sensor 313 is set at the center of the effective display area. That is, it is located between pixels PXL (5,3), PXL (5,4), PXL (6,3), PXL (6,4). In addition, based on the downsampling coefficients P and Q between the number of pixels (I*J) and the number of data elements (M*N), it can be known that the grayscale data element corresponding to the temperature sensing position bsPnt (x_bs, y_bs) is the grayscale data element gsD (3,2). Therefore, the grayscale value of the grayscale data element gsD(3,2) corresponding to the setting position of the temperature sensor 313 is defined as the reference grayscale value gsD_bs.

Please refer to Figure 12, which is a schematic diagram of calculating the grayscale difference data array △gsArr(M*N) based on the grayscale data array gsArr(M*N) and the reference grayscale value gsD_bs in Figure 10. Each grayscale difference data element △gsD(1,1)~△gsD(M,N) in the grayscale data array gsArr(M*N) is equivalent to the difference between each grayscale data element gsD(1,1)~gsD(M,N) in Figure 11 and the reference grayscale value gsD_bs. Therefore, it is assumed here that the grayscale difference data element △gsD(3,2) is used as the reference grayscale value gsD_bs, so the grayscale difference data element △gsD(3,2)=0.

Please refer to FIG. 13 , which is a schematic diagram of converting the grayscale difference data array △gsArr(M*N) in FIG. 12 into the temperature difference data array △TArr(M*N) according to the temperature difference lookup table △TLUT. The grayscale difference calculation module 4155 first obtains the grayscale difference data array △gsArr(M*N) of Figure 12 based on the comparison of each grayscale data element gsD(1,1)~gsD(M,N) and the reference grayscale value gsD_bs, and then converts the grayscale difference data array △gsArr(M*N) of Figure 12 into the temperature difference data array △TArr(M*N) of Figure 13 based on the grayscale difference data array △gsArr(M*N) and the temperature difference lookup table △TLUT (such as the example in Table 1). Table 1 is an example of the temperature difference lookup table △TLUT after normalization transformation.

In Table 1, the vertical column is the gray level difference △dGL after normalization transformation; the horizontal column represents the temperature T (Celsius); and the value in the table represents the temperature difference △T. The actual value of the temperature difference △T will change with the characteristics of the display panel 31. In addition, in actual application, the accuracy of the temperature difference △T may also be different. For the sake of simplicity, the changes in application are not described here.

It can be seen from Table 1 that there is a positive correlation between the grayscale difference △dGL and the temperature difference △T after normalization. That is, assuming that the pixel PXL is at the same temperature, the larger the grayscale difference △dGL after normalization, the larger the temperature difference △T. For example, assuming that the room temperature is 50 degrees Celsius, if the grayscale difference △dGL after normalization is equal to -1, the temperature difference △T is equal to -5.2 degrees; if the grayscale difference △dGL after normalization is equal to 0, the temperature difference △T is equal to 0.1 degrees; if the grayscale difference △dGL after normalization is equal to 1, the temperature difference △T is equal to 5.5 degrees. In other words, for the same pixel PXL(i,j), if the grayscale value corresponding to the pixel PXL(i,j) is higher, the temperature of the pixel PXL(i,j) itself is also higher. Accordingly, when the video compensation module 41 knows that the larger the value of a grayscale difference data element △gsD(m,n), it can be inferred that the temperature of the pixel PXL(i,j) corresponding to the grayscale difference data element △gsD(m,n) will be higher.

Assuming that the sensed temperature detT generated by the temperature sensor 313 is 45 degrees, and the grayscale difference dGL after normalization represented by a grayscale difference data element △gsD(m,n) is 0.5, it can be found that there is a temperature difference △T=4.4 degrees between the temperature at the position corresponding to the grayscale difference data element △gsD(m,n) on the display panel 31 and the sensed temperature detT. Alternatively, assuming that the sensed temperature detT generated by the temperature sensor 313 is 55 degrees, and the grayscale difference dGL represented by the grayscale difference data element △gsD(m,n) after normalization conversion is 0.0, it can be found that there is a temperature difference △T=-0.2 degrees between the temperature at the position corresponding to the grayscale difference data element △gsD(m,n) on the display panel 31 and the sensed temperature detT.

Table 1 assumes that the temperature range of the display device 3 is between 45 degrees Celsius and 60 degrees Celsius. In actual application, the temperature range of Table 1 can be larger (for example, 0 degrees Celsius to 85 degrees Celsius) to meet the possible usage scenarios of the display device 3. Furthermore, in actual application, the accuracy and representation of the grayscale difference △dGL in the table do not need to be limited. For example, the range of the grayscale difference △dGL is originally between -255 and 255. However, based on the consideration of simplifying the amount of data, the grayscale difference △dGL can be further normalized and converted to a range between -1 and 1 as shown in Table 1.

After the temperature difference data array △TArr(M*N) is generated according to the temperature difference lookup table △TLUT, the temperature of each data element estT(1,1)~estT(M,N) of the estimated temperature data array estTArr(M*N) can be estimated according to the above description and in combination with the sensed temperature detT. Please refer to Figure 14, which is a schematic diagram of the estimated temperature data array estTArr(M*N) calculated based on the sensed temperature detT and the temperature difference data array △TArr(M*N). Continuing with the above description, if the temperature difference △T=4.4 degrees is found from the temperature difference lookup table △TLUT, the temperature at the selected location can be estimated as detT-4.4=45-4.4=40.6 degrees. Similarly, if the temperature difference △T=-0.2 degrees is found from the temperature difference lookup table △TLUT, the temperature at the selected location can be estimated to be = detT-0.2=55-0.2=54.8 degrees.

In order to make the estimated temperature more uniform, the smoothing coefficient matrix smfltMTX can be used here to smooth the estimated temperature data array estTArr(M*N). Please refer to Figure 15, which is a schematic diagram of the smoothed temperature data array smTArr(M*N) generated after the estimated temperature data array estTArr(M*N) is smoothed using a smoothing filter. Formula 2 is an example of the smoothing coefficient matrix smfltMTX.

After receiving the smoothed temperature data array smTArr(M*N) from the smoothing module 414, the difference generation module 413 generates red compensation data elements △datR(1,1)~△datR(I, J), green compensation data elements △datG(1,1)~△datG(I,J), and blue compensation data elements △datG(1,1)~△datG(I,J). The process of the difference generation module 413 generating red compensation data elements △datR(1,1)~△datR(I,J), green compensation data elements △datG(1,1)~△datG(I,J), and blue compensation data elements △datG(1,1)~△datG(I,J) according to the smoothed temperature data array smTArr(M*N) can be divided into two stages (interpolation stage and difference compensation stage), as shown in Figures 16 and 17A~17C respectively.

First, the difference generation module 413 converts M*N smoothed temperature data elements smT(m,n) into I*J interpolated temperature data elements inT(i,j) through interpolation calculation in the interpolation stage. Each smoothed temperature data element smT(m,n) corresponds to P*Q interpolated temperature data elements inT(i,j). Figure 16 shows that the difference generation module 413 interpolates the smoothed temperature data array smTArr(M*N) in the interpolation stage to generate I*J interpolated temperature data elements inT(i,j).

In addition to the smoothed temperature data element smT(m,n), the difference generation module 413 also receives the red source data array srcArr_r(I*J), the green source data array srcArr_g(I*J), the blue source data array srcArr_b(I*J), and the data difference lookup table diffDatLUT stored in the storage circuit 43. The vertical columns of the data difference lookup table diffDatLUT are data values; the horizontal columns represent the temperature T. The values in the table are the data differences △dat. In order to simplify the data processing process and save the storage space of the storage circuit 43, it is assumed here that the source data arrays srcArr_r (I*J), srcArr_g (I*J), and srcArr_b (I*J) of different colors are all matched with the same data difference lookup table diffDatLUT. In actual applications, different data difference lookup tables diffDatLUT_r, diffDatLUT_g, and diffDatLUT_b can also be used for source data arrays srcArr_r (I*J), srcArr_g (I*J), and srcArr_b (I*J) of different colors. Such changes in application are not described in detail here.

In the difference compensation stage, the difference generation module 413 generates the required red compensation data elements △datR(1,1)~△datR(I,J), green compensation data elements △datG(1,1)~△datG(I,J), and blue compensation data elements △datB(1,1)~△datB(I,J) for the red source image srcIMG_r, the green source image srcIMG_g, and the blue source image srcIMG_b based on the interpolated temperature data elements inT(1,1)~inT(I,J) generated in the interpolation stage. The difference generation module 413 combines the interpolated temperature data element inT(i,j) of FIG. 16 with the red source data elements srcR(1,1)~srcR(I,J) of FIG. 7A, and finds out the I*J data difference values △dat corresponding to the combination from the data difference lookup table diffDatLUT as the red compensation data elements △datR(1,1)~△datR(I,J). Similarly, the difference generation module 413 matches each interpolated temperature data element inT(i,j) of Figure 16 with the green source data elements srcG(1,1)~srcG(I,J) of Figure 7B and the blue source data elements srcB(1,1)~srcB(I,J) of Figure 7C, and generates green compensation data elements △datG(1,1)~△datG(I,J) and blue compensation data elements △datB(1,1)~△datB(I,J) from the data difference lookup table diffDatLUT.

FIG. 17A shows that the difference generation module 413 generates I*J red compensation data elements △datR(1,1)~△datR(I,J) by searching the data difference lookup table diffDatLUT based on the temperature-data combination of I*J interpolated temperature data elements inT(1,1)~inT(I,J) and I*J red source data elements srcR(1,1)~srcR(I,J). FIG. 17B shows that the difference generation module 413 generates I*J green compensation data elements △datG(1,1)~△datG(I,J) by searching the data difference lookup table diffDatLUT based on the temperature-data combination of I*J interpolated temperature data elements inT(1,1)~inT(I,J) and I*J green source data elements srcG(1,1)~srcG(I,J). FIG. 17C shows that the difference generation module 413 generates I*J blue compensation data elements △datB(1,1)~△datB(I,J) by searching the data difference lookup table diffDatLUT based on the temperature-data combination of I*J interpolated temperature data elements inT(1,1)~inT(I,J) and I*J blue source data elements srcB(1,1)~srcB(I,J).

Please refer to FIG. 18A, which is a schematic diagram of the red summed data element sumR(i,j)(i=1~I, j=1~J) generated by combining the red source data elements srcR(1,1)~srcR(I,J) of the red source data array srcArr_r(I*J) of FIG. 7A with the red compensation data elements △datR(1,1)~△datR(I,J) of FIG. 17A. The red summed data element sumR(i,j)(i=1~I, j=1~J) represents the brightness of the red sub-pixel rsPXL(i,j). The red summed data element sumR(i,j) can be expressed as the sum of the red source data element srcR(i,j) and the red compensation data element △datR(i,j). That is, sumR(i,j)=srcR(i,j)+△datR(i,j).

Please refer to FIG. 18B, which is a schematic diagram of the green summed data element sumG(i,j)(i=1~I, j=1~J) generated by combining the green source data elements srcG(1,1)~srcG(I,J) of the green source data array srcArr_g(I*J) of FIG. 7B with the green compensation data elements △datG(1,1)~△datG(I,J) of FIG. 17B. The green summed data element sumG(i,j)(i=1~I, j=1~J) represents the brightness of the green sub-pixel gsPXL(i,j). The green summed data element sumG(i,j) can be expressed as the sum of the green source data element srcG(i,j) and the green compensation data element △datG(i,j). That is, sumG(i,j)=srcG(i,j)+△datG(i,j).

Please refer to FIG. 18C, which is a schematic diagram of a blue summed data element sumB(i,j) (i=1~I, j=1~J) generated by combining the blue source data elements srcB(1,1)~srcB(I,J) of the blue source data array srcArr_b(I*J) of FIG. 7C with the blue compensation data elements datB(1,1)~△datB(I,J) of FIG. 17C. The blue summed data element sumB(i,j) (i=1~I, j=1~J) represents the brightness of the blue sub-pixel bsPXL(i,j). The blue summed data element sumB(i,j) can be expressed as the sum of the blue source data element srcB(i,j) and the blue compensation data element △datB(i,j). That is, sumB(i,j)=srcB(i,j)+△datB(i,j).

After the video compensation module 41 generates the red summed data element sumR(i, j), the green summed data element sumG(i, j) and the blue summed data element sumB(i, j), the digital gamma circuit 337c generates a source control signal Sctl_src to the pixel array 311 accordingly. According to the source control signal Sctl_src, the brightness of the red sub-pixel rsPXL(i,j) in the pixel array 311 depends on the value of the red sum data element sumR(i,j); the brightness of the green sub-pixel gsPXL(i,j) in the pixel array 311 depends on the value of the green sum data element sumG(i,j); and the brightness of the blue sub-pixel bsPXL(i,j) in the pixel array 311 depends on the value of the blue sum data element sumB(i,j). Accordingly, the display screen dspIMG seen by the user on the display panel 31 is a combination of the red display screen dspIMG_r displayed by the red sub-pixels rsPXL(1,1)~rsPXL(I,J), the green display screen dspIMG_g displayed by the green sub-pixels gsPXL(1,1)~gsPXL(I,J), and the blue display screen dspIMG_b displayed by the blue sub-pixels bsPXL(1,1)~bsPXL(I,J).

Please refer to Figure 19, which is a schematic diagram summarizing the relationship between various types of data in this case. Because this case involves the conversion and processing of multiple types of data, Figure 19 is used here to mark the data related to the aforementioned components, and the direction of the arrow represents the conversion relationship between the data. The data arrays in the dashed box FM1 and FM3 each contain I*J data elements. The data arrays in the dashed box FM2 each contain M*N data elements. Since the previous paragraphs have explained the relationship and use of these data, the content of Figure 19 will not be explained in detail here.

Since the content of the source image srcIMG may change over time, the data content received and displayed by the video compensation module 41 may also change over time. Therefore, in FIG. 19, (t) represents the data related to the current time point; (t-△t) represents the data related to the previous time point.

For example, when the temperature sensor 313 obtains the sensed temperature detT(t) at the current time point, the display device 3 simultaneously receives the source image srcIMG(t) corresponding to the current time point. At the same time, the pixel array 311 displays the display image dspIMG(t-△t) generated based on the source image srcIMG(t-△t) at the previous time point (t-△t). Here, when the temperature sensor 313 performs temperature sensing, the display image dspIMG(t-△t) generated based on the source image srcIMG(t-△t) at the previous time point (t-△t) displayed by the pixel array 311 can be referred to as the detected image.

In Figure 19, the data parameters marked with a bold frame are auxiliary data whose data content does not change with time. Such data content that does not change with time includes the data difference lookup table diffDatLUT, the temperature difference lookup table △TLUT and the smoothing coefficient matrix smfltMTX provided by the storage device; and the temperature sensing position bsPnt (x_bs, y_bs).

In the above-mentioned embodiment, it is assumed that the temperature sensing position bsPnt (x_bs, y_bs) is located at the center of the effective display area. If the temperature sensing position bsPnt (x_bs, y_bs) changes in the position of the effective display area, the sensed temperature detT(t) sensed by the temperature sensor 313 and the corresponding pixel position are different, but according to the above, the grayscale difference data array △gsArr(t) generated according to the source image srcIMG(t) is converted into the estimated temperature data array estTArr(t) by using the temperature difference lookup table △TLUT provided by the storage circuit 43, and the estimated temperature data array estTArr(t) is smoothed by using the smoothing coefficient matrix smfltMTX. After the processing, the smoothed temperature data array smTArr(t) and the red source data array srcArr_r(t), green source data array srcArr_g(t), and blue source data array srcArr_b(t) are converted into red compensation data elements △datR(1,1)~△datR(I,J), green compensation data elements △datG(1,1)~△datG(I,J), and blue compensation data elements △datG(1,1)~△datG(I,J) by interpolation calculation and searching the data difference lookup table diffDatLUT. Afterwards, the red compensation data elements △datR(1,1)~△datR(I,J), green compensation data elements △datG(1,1)~△datG(I,J), and blue compensation data elements △datG(1,1)~△datG(I,J) are combined with the red source data array srcArr_r(t), green source data array srcArr_g(t), and blue source data array srcArr_b(t) to synthesize the display screen dspIMG(t). The data conversion method of the steps is still similar. Therefore, in actual application, the position of the temperature sensing position bsPnt(x_bs,y_bs) on the x-y plane can be anywhere within the effective display area.

Please refer to Figure 20, which shows the display screen dspIMG displayed after the μLED display panel receives the source screen srcIMG of Figure 2 and generates the red summed data element sumR(i,j)(i=1~I, j=1~J) of Figure 18A, the green summed data element sumG(i,j)(i=1~I, j=1~J) of Figure 18B, and the blue summed data element sumB(i,j)(i=1~I, j=1~J) of Figure 18C in combination with the video compensation module of the present disclosure. Similarly, in Figure 20, the grid is only used to mark the corresponding relationship between the screen blocks and pixels, and is not the content of the display screen dspIMG itself.

As can be seen from FIG. 20, after compensation using the video compensation module 41 conceived by the present disclosure, it can be roughly seen from the display screen dspIMG that the pixels located in the middle of the vertical direction and the pixels located in the middle of the horizontal direction have higher brightness, which is roughly consistent with the appearance of the source screen srcIMG in FIG. 2. Compared with the compensated screen cmpIMG in FIG. 3, in which the overall brightness distribution shows that the upper left is darker and the lower right is brighter, the display effect of FIG. 20 is obviously more consistent with the content of the source screen srcIMG. In other words, in terms of the presentation of the picture, the present disclosure can provide a better picture compensation effect. Furthermore, when adopting the present method, only one temperature sensor 313 is needed, which not only reduces the overall hardware cost, but also makes the location of the setting quite flexible. In summary, the display device using the disclosed concept can provide better compensation effect at a lower cost for the situation where the display effect of μLED pixels is affected by temperature fluctuations.

In summary, although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Those with common knowledge in the technical field to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope defined in the attached patent application.

41: Video compensation module

43: Storage circuit

smfltMTX: smoothing coefficient matrix

diffDatLUT: Data difference lookup table

△TLUT: Temperature difference lookup table

411: Data aggregation module

413: Difference generation module

414: Smoothing module

415: Grayscale-temperature conversion module

4151: Temperature estimation module

4153: Temperature difference conversion module

4155: Grayscale difference calculation module

417: Preprocessing module

4171:Pixel reduction module

4173: Channel reduction module

△datR(i,j): red compensation data element

△datG(i,j): Green compensation data element

△datB(i,j): blue compensation data element

sumR(i,j): red summed data elements

sumG(i,j): Green summed data elements

sumB(i,j): blue summed data elements

smTArr(M*N): smoothed temperature data array

estTArr(M*N): Estimated temperature data array

detT: Sense temperature

△TArr(M*N): Temperature difference data array

△gsArr(M*N): grayscale difference data array

gsArr(M*N): grayscale data array

dsArr_r(M*N): Red downsampled data array

dsArr_g(M*N): Green downsampled data array

dsArr_b(M*N): blue downsampled data array

srcArr_r(I*J): red source data array

srcArr_g(I*J): Green source data array

srcArr_b(I*J): blue source data array

bsPnt(x_bs,y_bs): Temperature sensing position

Claims (12)

A display device comprises: a display panel, comprising: a pixel array, which displays a first picture; and a temperature sensor, which is arranged at a temperature sensing position, which generates a sensed temperature corresponding to the temperature sensing position when the pixel array displays the first picture; and a video compensation module, which is electrically connected to the pixel array and the temperature sensor, which receives a plurality of source data arrays corresponding to a second picture, wherein the video compensation module is It includes: a pre-processing module, which converts the source data arrays into a grayscale data array; and a grayscale-temperature conversion module, which is electrically connected to the temperature sensor and the pre-processing module, and converts the grayscale data array into an estimated temperature data array according to the sensed temperature, a temperature difference lookup table and the temperature sensing position, wherein the pixel array displays the second screen according to the estimated temperature data array and the source data arrays. A display device as described in claim 1, wherein the display panel further comprises: a substrate, wherein the pixel array is located in an effective display area on the substrate, and the temperature sensing position is within the range of the effective display area. A display device as described in claim 1, wherein the pre-processing module comprises: A pixel reduction module, which downsamples a first source data array, a second source data array and a third source data array among the source data arrays respectively and converts them into a first downsampled data array, a second downsampled data array and a third downsampled data array, wherein the first source data array comprises I*J first source data elements, the second source The data array includes I*J second source data elements, the third source data array includes I*J third source data elements, the first downsampled data array includes M*N first downsampled data elements, the second downsampled data array includes M*N second downsampled data elements, and the third downsampled data array includes M*N third downsampled data elements, wherein I, J, M, and N are positive integers, I is greater than M, and J is greater than N. The display device as described in claim 3, wherein the pre-processing module further comprises: a channel reduction module electrically connected to the pixel reduction module, which converts the first down-sampled data array, the second down-sampled data array and the third down-sampled data array into the grayscale data array according to a grayscale conversion relationship, wherein the grayscale data array comprises M*N grayscale data elements. The display device as described in claim 1, wherein the grayscale-temperature conversion module comprises: a grayscale difference calculation module, which selects one corresponding to the temperature sensing position from the M*N grayscale data elements contained in the grayscale data array as a reference grayscale value, and then calculates the difference between each of the M*N grayscale data elements and the reference grayscale value, thereby generating a grayscale difference data array, wherein M and N are positive integers. The display device as described in claim 5 further comprises: a storage circuit electrically connected to the grayscale-temperature conversion module, which stores the temperature difference lookup table, wherein the temperature difference lookup table comprises a plurality of temperature difference values corresponding to a plurality of grayscale values and a plurality of temperatures. The display device as described in claim 6, wherein the grayscale-temperature conversion module further comprises: a temperature difference conversion module electrically connected to the temperature sensor, the grayscale difference calculation module and the storage circuit, which converts the grayscale difference data array into a temperature difference data array according to the sensed temperature and the temperature difference lookup table, wherein the temperature difference data array comprises M*N temperature difference data elements. The display device as described in claim 7, wherein the grayscale-temperature conversion module further comprises: a temperature estimation module electrically connected to the temperature sensor and the temperature difference conversion module, which calculates the sum of the sensed temperature and each of the M*N temperature difference data elements respectively, thereby generating the estimated temperature data array, wherein the estimated temperature data array comprises M*N estimated temperature data elements. The display device as described in claim 1, wherein the video compensation module further comprises: a smoothing module, which performs a smoothing operation on the estimated temperature data array according to a smoothing coefficient matrix to generate a smoothed temperature data array, wherein the smoothed temperature data array comprises M*N smoothed temperature data elements, wherein M and N are positive integers. The display device as described in claim 9, wherein the video compensation module further comprises: a difference generation module electrically connected to the smoothing module, which interpolates the smoothed temperature data array to generate I*J interpolated temperature data elements, and converts a first source data array, a second source data array and a third source data array in the source data arrays into I*J first compensation data elements, I*J second compensation data elements and I*J third compensation data elements respectively according to a data difference lookup table, wherein I and J are positive integers, I is greater than M, and J is greater than N. The display device as described in claim 10, wherein the video compensation module further comprises: a data summing module electrically connected to the difference generating module, which, after receiving the source data arrays, the I*J first compensation data elements, the I*J second compensation data elements and the I*J third compensation data elements, respectively adds the I*J first source data elements contained in a first source data array among the source data arrays and each of the I*J first compensation data elements to generate I*J first summed data elements; and adds the I*J first source data elements contained in a second source data array among the source data arrays to generate I*J first summed data elements. J second source data elements are added to each of the I*J second compensation data elements to generate I*J second summed data elements; and I*J third source data elements included in a third source data array among the source data arrays are added to each of the I*J third compensation data elements to generate I*J third summed data elements, wherein the pixel array includes I*J pixels, and the brightness of each of the I*J pixels is determined according to each of the I*J first summed data elements, each of the I*J second summed data elements, and each of the I*J third summed data elements. A display method is applied to a display device including a display panel and a video compensation module, wherein the display panel includes a pixel array and a temperature sensor, and the display method includes the following steps: the pixel array displays a first picture; the temperature sensor disposed at a temperature sensing position generates a sensed temperature corresponding to the temperature sensing position when the pixel array displays the first picture; the video compensation module receives a plurality of pixels corresponding to a second picture; source data arrays; a pre-processing module of the video compensation module converts the source data arrays into a grayscale data array; a grayscale-temperature conversion module of the video compensation module converts the grayscale data array into an estimated temperature data array according to the sensed temperature, a temperature difference search and the temperature sensing position where the temperature sensor is located; and the pixel array displays the second screen according to the estimated temperature data array and the source data arrays.