TWI760139B - Display drive device with crosstalk compensation and display device having the same - Google Patents

Abstract

A display drive device includes a pixel row grayscale characteristic value calculation unit, a pixel crosstalk compensation unit, and a driving unit. The pixel column grayscale characteristic value calculation unit calculates a pixel row grayscale characteristic value of each pixel row of a display frame, wherein the pixel row gray-scale characteristic value is the sum of the pixel grayscale characteristic values of all display pixels of the corresponding pixel row. The pixel crosstalk compensation unit compensates each display pixel of the corresponding pixel row with a pixel compensation value of each pixel row, wherein the pixel compensation value of each pixel row is generated according to comparison between the pixel row grayscale characteristic value of the pixel row and a plurality of predetermined pixel row grayscale characteristic thresholds. The driving unit drives a display panel by using the compensated display pixels of display frame.

Description

Display driving device with crosstalk compensation and display device including the same

The present invention relates to the technical field of display driving, and more particularly, to a display driving device with crosstalk compensation and a display device including the same.

For example, the brightness displayed by a flat display panel, such as an organic light emitting diode (OLED) panel, is often affected by images in adjacent areas, resulting in uneven brightness and darkness. Obviously, this is caused by the phenomenon of crosstalk (crosstalk) in which the signals are coupled and interfere with each other.

Figure 1 shows a picture of a display frame (frame) to illustrate the crosstalk phenomenon. As shown in the figure, the display frame has a black area. When driving to the display scan line S(x-1), since the picture is white, Therefore, the voltage of the display data line D(a) is a low potential (L), and when it is driven to the display scan line S(x), since the screen displays a black block, the voltage of the display data line D(a) is changed from a low potential to a low potential. (L) turns to high potential (H), when driven to display scan line S(x+1), the screen displays black blocks, so the voltage of display data line D(a) is high potential (H), because the aforementioned The change of the voltage of the display data line D(a) from a low potential (L) to a high potential (H) will affect the operating voltage (ELVDD) of the pixel units in the same row (row) of the display panel, resulting in a rise in the operating voltage Surge.

Further, when driven to the display scan line S(y), the screen still displays black blocks, so the voltage of the display data line D(a) is a high potential (H), and when driven to the display scan line S(y+1 ), since the screen is white, the voltage of the display data line D(a) changes from high potential (H) to low potential (L), when driven to the display scan line S(y+2), the screen is white, Therefore, the voltage of the display data line D(a) is a low potential (L). Since the voltage of the display data line D(a) changes from a high potential (H) to a low potential (L), it will affect the same row (row) of the display panel. ) of the working voltage (ELVDD) of the pixel unit, resulting in a drop surge on the working voltage.

Therefore, for the display data line D(b) as shown in FIG. 1 , a rising spike is generated because the operating voltages of the pixel columns corresponding to the display scan lines S(x) and S(y+1) are disturbed. The falling surge also affects the display of the display data line D(b), resulting in uneven brightness and darkness of the display panel.

In order to solve the phenomenon of uneven brightness and darkness of the display panel caused by the aforementioned crosstalk, a direct solution is to compensate the voltage of the display data line according to the surge change in the operating voltage of the pixel row, for example, make the display data line D ( The voltage of b) changes in response to the sudden change of the working voltage. However, this compensation method is affected by the time delay and cannot correctly compensate the voltage of the display data line, so it cannot meet the actual demand.

Therefore, in the design of the crosstalk compensation of the conventional display panel, there are still many defects and it is necessary to improve it.

The main purpose of the present invention is to provide a display driving device with crosstalk compensation and a display device including the same, which utilizes an algorithm to analyze the image content of the display frame to calculate the pixel row grayscale characteristic value of each pixel row, and then through the Compared with the pixel column grayscale characteristic threshold, The pixel column compensation value of each display pixel is obtained, and compensation is performed accordingly to effectively reduce the influence of crosstalk.

According to a feature of the present invention, a display driving device is provided for driving a display panel to display a display frame on the display panel, the display frame has a plurality of pixel rows, and each pixel row has a plurality of display pixels , the pixel value of each display pixel includes at least one color value, and the display driving device includes: a pixel row grayscale characteristic value calculation unit for calculating a pixel row grayscale characteristic value of each pixel row of the display frame , wherein the gray-scale characteristic value of the pixel row is the sum of the pixel gray-scale characteristic values of all display pixels in the corresponding pixel row, and the pixel gray-scale characteristic value of each display pixel is based on the pixel color integration value of the display pixel and the preset value. The gray-scale characteristic thresholds of a plurality of pixels are compared and generated, and the pixel color integration value of each display pixel is the sum of the pixel values of all colors of the display pixel multiplied by the corresponding weights respectively; a pixel crosstalk compensation unit, Compensate each display pixel of the corresponding pixel row with a pixel compensation value of each pixel row, wherein the pixel compensation value of each pixel row is based on the pixel row grayscale characteristic value of the pixel row and a preset plurality of and a driving unit for driving the display panel with the compensated display pixels of the display frame.

According to another feature of the present invention, a display device is provided, comprising: a display panel; and a display driving device for driving the display panel to display a display frame on the display panel, the display frame having a plurality of pixel rows , each pixel row has a plurality of display pixels, the pixel value of each display pixel includes at least one color value, and the display driving device includes: a pixel row grayscale characteristic value calculation unit for calculating each pixel of the display frame A pixel row grayscale characteristic value of a row, wherein the pixel row grayscale characteristic value is the sum of the pixel grayscale characteristic values of all display pixels in the corresponding pixel row, and the pixel grayscale characteristic value of each display pixel is based on the display The ratio of the pixel color integration value of the pixel to the preset threshold ratio of the grayscale characteristics of multiple pixels Then, the pixel color integration value of each display pixel is based on the sum of the pixel values of all colors of the display pixel multiplied by the corresponding weights respectively; a pixel crosstalk compensation unit is based on a pixel value of each pixel row. The pixel compensation value is used to compensate each display pixel of the corresponding pixel row, wherein the pixel compensation value of each pixel row is determined according to the pixel row grayscale characteristic value of the pixel row and a plurality of preset pixel row grayscale characteristic thresholds. generating; and a driving unit for driving the display panel with the compensated display pixels of the display frame.

The above overview and the following detailed description are exemplary in nature, and are intended to further illustrate the scope of the present invention, and other objects and advantages of the present invention will be explained in the following descriptions and drawings.

10: Display panel

20: Display driver

21: Drive unit

23: Pixel column grayscale characteristic value calculation unit

25: Pixel crosstalk compensation unit

30: show frame

31: Pixel column

311: Display pixels

FIG. 1 shows a display frame image to illustrate the crosstalk phenomenon.

FIG. 2 shows a schematic diagram of the display device of the present invention.

FIG. 3 shows an operation example of the pixel row grayscale characteristic value calculation unit according to the present invention.

FIG. 4 shows an example of the operation of the pixel crosstalk compensation unit according to the present invention.

FIG. 5 shows a test example of crosstalk compensation according to the present invention.

FIG. 6 shows another test example for crosstalk compensation according to the present invention.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, and are not intended to limit the present invention. invention.

2 shows a schematic diagram of the display device of the present invention, which includes a display panel 10 and a display driving device 20. The display driving device 20 has a driving unit 21, a pixel row grayscale characteristic value calculation unit 23, and a pixel crosstalk compensation unit 25. The display driving device 20 is used for driving the display panel 10 to display a display frame 30 on the display panel 10 . The display frame 30 has a plurality of pixel rows 31 , each pixel row 31 has a plurality of display pixels 311 , and each display frame 30 has a plurality of display pixels 311 . The pixel 311 includes at least one display sub-pixel of a specific color, that is, the pixel value of each display pixel 311 includes at least one color value. In one embodiment and the following description of the present invention, each display pixel of the display frame 30 is displayed. 311 includes a red display sub-pixel, a green display sub-pixel and a blue display sub-pixel, that is, the pixel value of each display pixel 311 includes a red color value (R), a green color value (G) and A blue color value (B). In other embodiments, the display sub-pixels in the display pixel 311 can also be a combination of different colors. Therefore, the present invention is not limited to the color combination of the display sub-pixels.

The aforementioned pixel row grayscale characteristic value calculation unit 23 is used to calculate a pixel row grayscale characteristic value K of each pixel row 31 of the display frame 30 , and the pixel row grayscale characteristic value K is all display pixels corresponding to the pixel row 31 . The sum of the pixel grayscale characteristic values q of 311, and the pixel grayscale characteristic value q of each display pixel 311 is obtained by comparing the pixel color integration value v of the display pixel 311 with a predetermined plurality of pixel grayscale characteristic thresholds th. The resulting value, wherein the pixel color integration value v of each display pixel 311 is the sum of the pixel values (R/G/B) of all colors of the display pixel 311 multiplied by the corresponding weights respectively.

The value of the above-mentioned plurality of pixel grayscale characteristic thresholds th is an integer greater than 0 and increases sequentially, so a plurality of numerical ranges can be defined in the values greater than 0, and the plurality of numerical ranges respectively correspond to a plurality of preset pixel grayscales The characteristic value q', and the gray-scale characteristic values q' of a plurality of preset pixels are sequentially reduced, for example, sequentially reduced to 0, so the integrated value v is based on the pixel color In which numerical range the bit is, it can be obtained that the pixel grayscale characteristic value q of the display pixel 311 is the preset pixel grayscale characteristic value q' corresponding to the numerical range.

Please refer to FIG. 3 for an example of the operation of the pixel row grayscale characteristic value calculation unit 23 according to the present invention, which shows that a pixel value (R/G/B) of a display pixel 311 of a pixel row 31 has a red color value R, a green color value G and a blue color value B, the weights corresponding to the red color value R, the green color value G and the blue color value B are wr, wg and wb respectively, wherein the weights wr, wg and wb are respectively is a value between 0 and 1, for example, wr=1/4, wg=1/2, wb=1/4, accordingly, the pixel color integration value v of the display pixel 311 is wr×R+wg×G+ wb×B. As shown in the example of FIG. 3, the plurality of pixel grayscale characteristic thresholds th include three pixel grayscale characteristic thresholds th1, th2, th3, where 0<th1<th2<th3, so it can be defined in a value greater than 0 Four numerical ranges vs1, vs2, vs3, vs4 are obtained. These numerical ranges vs1, vs2, vs3, and vs4 correspond to the four preset pixel grayscale characteristic values q1, q2, q3, and q4 respectively, where q1>q2>q3 >q4=0, so according to the value range where the pixel color integration value v is located, such as the value range vs2 (that is, v is between th1 and th2), the pixel grayscale characteristic value q of the display pixel 311 can be obtained as The preset pixel grayscale characteristic value q2 corresponding to the numerical range vs2.

The pixel grayscale characteristic value q of each display pixel 311 in a pixel row 31 can be obtained in the above-mentioned manner, and then the pixel grayscale characteristic value q of all the display pixels 311 in the pixel row 31 can be summed up to calculate The pixel column grayscale characteristic value K of each pixel column 31 .

Referring to FIG. 2 again, the aforementioned pixel crosstalk compensation unit 25 uses a pixel compensation value comp of each pixel row 31 to compensate each display pixel 311 of the corresponding pixel row 31 to eliminate the influence of crosstalk. The pixel compensation value comp is a value generated by comparing the pixel row gray-scale characteristic value K of the pixel row 31 with a predetermined plurality of pixel row gray-scale characteristic thresholds TH, wherein the above-mentioned plurality of pixel row gray-scale characteristic thresholds TH value is greater than The integer of 0 increases in sequence, so a plurality of value ranges can be defined in the values greater than 0, and the plurality of value ranges respectively correspond to the plurality of preset pixel compensation values comp', and the plurality of preset pixel compensation values comp' In order to increase sequentially, for example, from 0, the pixel compensation value comp of the display pixel 311 corresponding to the pixel row 31 can be obtained according to the numerical range in which the grayscale characteristic value K of the pixel row is in the numerical range. The corresponding preset pixel compensation value comp'.

comp2

comp3

comp4，故根據顯示像素311所屬像素列31的像素列灰階特性值K所在的數值範圍，例如為數值範圍VS2(亦即，K介於TH1與TH2之間)，即可獲得顯示像素311的像素補償值comp為數值範圍VS2所對應的預設像素補償值comp2，據此像素串擾補償單元25以此像素補償值comp對顯示像素311的像素值(R/G/B)進行補償，補償後的像素值(R’/G’/B’)為：R’=R-comp=R-comp2，G’=G-comp=G-comp2，B’=B-comp=B-comp2，以此方式即可對顯示圖框30的每一像素列31的每一顯示像素311進行補償，使得驅動單元21能以顯示圖框30的補償後的顯示像素311來驅動顯示面板10，以正確地進行顯示而不受串擾之影響。 Please refer to FIG. 4 for an example of the operation of the pixel crosstalk compensation unit 25 according to the present invention, which shows that a pixel row 31 has a pixel row gray scale characteristic value K, and a display pixel 311 of the pixel row 31 has a display pixel value (R ,G,B), most pixel row grayscale characteristic thresholds TH include three pixel row grayscale characteristic thresholds TH1, TH2, TH3, where 0<TH1<TH2<TH3, so it can be defined in a value greater than 0 Four numerical ranges VS1, VS2, VS3, VS4, these numerical ranges VS1, VS2, VS3, VS4 correspond to the four preset pixel column compensation values comp1, comp2, comp3, comp4, where 0=comp1

comp2

comp3

comp4, so according to the numerical range in which the grayscale characteristic value K of the pixel row 31 of the pixel row 31 to which the display pixel 311 belongs, such as the numerical value range VS2 (that is, K is between TH1 and TH2), the value of the display pixel 311 can be obtained. The pixel compensation value comp is the preset pixel compensation value comp2 corresponding to the value range VS2, according to which the pixel crosstalk compensation unit 25 compensates the pixel value (R/G/B) of the display pixel 311 with the pixel compensation value comp. The pixel value (R'/G'/B') is: R'=R-comp=R-comp2, G'=G-comp=G-comp2, B'=B-comp=B-comp2, so that In this way, each display pixel 311 of each pixel row 31 of the display frame 30 can be compensated, so that the driving unit 21 can drive the display panel 10 with the compensated display pixels 311 of the display frame 30 to correctly perform display without being affected by crosstalk.

FIG. 5 shows a test example of crosstalk compensation according to the present invention, wherein the display frame 30 has white areas A, B, C and black areas D1, D2, and the white area B is located between the black areas D1, D2. Compensation is required, the pixel value of the white area A, B, C is (255, 255, 255), the pixel value of the black area D1, D2 is (0, 0, 0), and after the crosstalk compensation of the present invention, the white area B is compensated for the pixel value The value is (254,254,254).

FIG. 6 shows another test example of crosstalk compensation according to the present invention, and the white areas A, X, B, C, D, E, F, G, H, I, J to be compensated are marked in the figure, wherein, Since the black area adjacent to the white area X is small, the calculated pixel compensation value comp of the white area X is 0, so the white area X will not be compensated; and in the area that needs to be compensated, the original value of the white area A is The pixel value is (255, 255, 255), the pixel value after compensation is (253, 253, 253); the original pixel value of white area B is (255, 255, 255), the pixel value after compensation is (253, 253, 253); the original pixel value of white area C is (255, 255, 255) , the compensated pixel value is (254, 254, 254); the original pixel value of the white area D is (255, 255, 255), and the compensated pixel value is (253, 253, 253); the original pixel value of the white area E is (255, 255, 255), and the compensated pixel value is (253, 253, 253); the original pixel value of the white area F is (255, 255, 255), and the pixel value after compensation is (253, 253, 253); the original pixel value of the white area G is (255, 255, 255), and the pixel value after compensation is (254, 254, 254); white The original pixel value of area H is (255, 255, 255), the pixel value after compensation is (253, 253, 253); the original pixel value of white area I is (255, 255, 255), the pixel value after compensation is (254, 254, 254); the original pixel value of white area J is (255, 255, 255), and the pixel value after compensation is (254, 254, 254).

As can be seen from the above description, the present invention uses an algorithm to analyze the image content of the display frame to calculate the pixel row grayscale characteristic value of each pixel row, and then compares the pixel row grayscale The pixel row compensation value of each display pixel is obtained according to the characteristic threshold. Accordingly, by changing the pixel value of the display frame, the phenomenon of crosstalk can be effectively improved and reduced.

The above-mentioned embodiments are only examples for convenience of description, and the scope of the claims claimed in the present invention should be based on the scope of the patent application, rather than being limited to the above-mentioned embodiments.

10: Display panel

20: Display driver

21: Drive unit

23: Pixel column grayscale characteristic value calculation unit

25: Pixel crosstalk compensation unit

30: show frame

31: Pixel column

311: Display pixels

Claims (9)

A display driving device for driving a display panel to display a display frame on the display panel, the display frame has a plurality of pixel rows, each pixel row has a plurality of display pixels, and the pixel value of each display pixel includes at least one color value, the display driving device includes: a pixel row grayscale characteristic value calculation unit for calculating a pixel row grayscale characteristic value of each pixel row of the display frame, wherein the pixel row grayscale characteristic The value is the sum of the pixel gray-scale characteristic values of all display pixels in the corresponding pixel row. The pixel gray-scale characteristic value of each display pixel is compared with a plurality of preset pixel gray-scale characteristic thresholds according to the pixel color integration value of the display pixel. Then, the pixel color integration value of each display pixel is the sum of the pixel values of all colors of the display pixel multiplied by the corresponding weights respectively; a pixel crosstalk compensation unit is a pixel compensation value of each pixel row. to compensate each display pixel of the corresponding pixel row, wherein the pixel compensation value of each pixel row is generated according to the pixel row grayscale characteristic value of the pixel row and a plurality of predetermined pixel row grayscale characteristic thresholds; and a driving unit for driving the display panel with the compensated display pixels of the display frame, wherein the threshold value of the gray-scale characteristic of the plurality of pixels is an integer greater than 0 and increases sequentially, so that the value greater than 0 A plurality of numerical ranges are defined in , respectively, corresponding to a plurality of preset pixel gray-scale characteristic values, and the plurality of predetermined pixel gray-scale characteristic values are sequentially decreased. The display driving device according to claim 1, wherein the pixel grayscale characteristic value of the display pixel is a preset pixel grayscale characteristic value corresponding to a numerical range in which the pixel color integration value of the display pixel is located. The display driving device of claim 1, wherein the plurality of predetermined pixel grayscale characteristic values are sequentially reduced to 0. The display driving device according to claim 1, wherein the pixel value of each display pixel has a red color value, a green color value and a blue color value, and the pixel color integration value of each display pixel is: v= wr×R+wg×G+wb×B, where v represents the pixel color integration value, R represents the red color value, G represents the green color value, B represents the blue color value, wr, wg and wb are respectively between 0 A weight of ~1. The display driving device according to claim 1, wherein the threshold values of the grayscale characteristics of the plurality of pixel rows are integers greater than 0 and increase sequentially, so as to define a plurality of numerical ranges among the values greater than 0, respectively. Corresponding to a plurality of preset pixel compensation values, the plurality of preset pixel compensation values increase sequentially. The display driving device according to claim 5, wherein the pixel compensation value of the display pixel is a preset pixel compensation value corresponding to the numerical range of the pixel column gray scale characteristic value of the pixel column to which the display pixel belongs. The display driving device according to claim 5, wherein the plurality of preset pixel compensation values are sequentially increased from 0. The display driving device of claim 6, wherein the pixel value of each display pixel has a red color value, a green color value and a blue color value, and the pixel crosstalk compensation unit uses the pixel compensation value for the display The pixel value of the pixel is compensated as: R'=R-comp, G'=G-comp, B'=B-comp, Among them, R represents red color value before compensation, G represents green color value before compensation, B represents blue color value before compensation, R' represents red color value after compensation, G' represents green color value after compensation, B' represents after compensation The blue color value, comp represents the pixel compensation value. A display device, comprising: a display panel; and a display driving device, driving the display panel to display a display frame on the display panel, the display frame has a plurality of pixel rows, and each pixel row has a plurality of display pixels , the pixel value of each display pixel includes at least one color value, and the display driving device includes: a pixel row grayscale characteristic value calculation unit for calculating a pixel row grayscale characteristic value of each pixel row of the display frame , wherein the gray-scale characteristic value of the pixel row is the sum of the pixel gray-scale characteristic values of all display pixels in the corresponding pixel row, and the pixel gray-scale characteristic value of each display pixel is based on the pixel color integration value of the display pixel and the preset value. It is generated by comparing the gray-scale characteristic thresholds of a plurality of pixels, and the pixel color integration value of each display pixel is the sum of the pixel values of all colors of the display pixel multiplied by the corresponding weights respectively; a pixel crosstalk compensation unit is A pixel compensation value of each pixel row is used to compensate each display pixel of the corresponding pixel row, wherein the pixel compensation value of each pixel row is based on the pixel row grayscale characteristic value of the pixel row and a plurality of preset pixel rows. grayscale characteristic thresholds are compared and generated; and a driving unit drives the display panel with the compensated display pixels of the display frame, wherein the grayscale characteristic thresholds of the plurality of pixels are integers greater than 0 and are sequentially Increase, to define a plurality of numerical ranges corresponding to a plurality of preset pixel grayscale characteristic values among the values greater than 0, and the plurality of predetermined pixel grayscale characteristic values decrease sequentially.

Images