TWI768751B - Display drive device with overdrive and display device having the same - Google Patents

Abstract

A display drive device includes a drive unit, a storage unit and an overdrive data processing unit. The drive unit drives a display panel to display a current display frame. The storage unit stores the continuous color line information of each pixel row of the previous display frame, wherein the drive unit is based on the continuous color line information of the previous display frame stored in the storage unit to perform overdrive compensation on the display pixels of the current display frame. The overdrive data processing unit is based on the current display frame to generate the continuous color line information corresponding to the current display frame.

Description

Display driving device with overvoltage driving 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 overvoltage driving and a display device including the same.

Press, when the display panel is switching the display frame, if the response time of the display panel is not fast enough, the display pixels of the new display frame will not be able to reach the target brightness within one frame display time. This results in an afterimage. Taking the frame rate of 60Hz as an example, the response time of the pixel unit of the display panel must be within 16.6ms to display new display pixels immediately, otherwise, afterimages will occur.

Since the response time of liquid crystal display (LCD) panels is generally not fast enough, it is necessary to use overdrive technology to accelerate the liquid crystal flipping, while organic light emitting diode (OLED) panels have fast response times, but for some Extreme color conversions, such as converting a completely black pixel to an all-white pixel, may still have a slower response time than 16.6ms, resulting in afterimages.

The existing overvoltage driving technology needs to additionally store the complete frame information of the previous display frame, so that when the current display frame is displayed, the display pixels of the current display frame and the stored display pixels of the previous display frame are compared one by one. Overvoltage drive on the During the display frame period, it is necessary to store the data of the entire display frame for the comparison of each display pixel of the next display frame to look up the table for compensation. The technology is difficult to apply to most display panels, and the cost of driver chips is too high to apply to non-high-end products.

Therefore, there are still many deficiencies in the design of the overvoltage driving of the conventional display panel, and it is necessary to improve it.

The main purpose of the present invention is to provide a display driving device with overvoltage driving and a display device including the same, which can perform overvoltage driving only by storing line segment information of a previous display frame, and can greatly save memory space , increasing the possibility of productization.

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 , each display pixel includes at least one color value, and the display driving device includes: a driving unit, which drives the display panel to display a current display frame; a storage unit, which stores the data of each pixel row of the previous display frame. having continuous color line segment information, wherein the driving unit performs overvoltage driving compensation on display pixels of the current display frame according to the continuous color line segment information of the previous display frame stored in the storage unit; and an overvoltage driving data The processing unit generates continuous color line segment information corresponding to the current display frame according to the current display frame.

According to another feature of the present invention, a display device is provided, comprising: a display panel and a display driving device. The display driving device drives 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 There are a plurality of display pixels, and each display pixel includes at least one color value. The display driving device includes: a driving unit for driving the display panel to display a current display frame; a storage unit for storing each of the previous display frame. The continuous color line segment information of a pixel row, wherein the driving unit performs over-voltage driving compensation on the display pixels of the current display frame according to the continuous color line segment information of the previous display frame stored in the storage unit; and a The overvoltage driving data processing unit generates continuous color line segment information corresponding to the current display frame according to the current 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: Overvoltage drive data processing unit

25: Storage unit

30: show frame

31,31': pixel column

311: Display pixels

35: Continuous color line segment

S21~S23: Steps

FIG. 1 shows a schematic diagram of a display device of the present invention.

FIG. 2 shows the process of generating the continuous color line segment information of the display frame by the overvoltage driving data processing unit according to the present invention.

FIG. 3 shows that a pixel row of a display frame according to the present invention has a plurality of continuous color line segments.

FIG. 4 shows a recording example of a pixel row according to the present invention.

FIG. 5 shows an example of overvoltage driving compensation for a pixel row 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 here The described specific embodiments are only used to explain the embodiments of the present invention, and are not used to limit the present invention.

1 shows a schematic diagram of a 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, an overvoltage driving data processing unit 23, and a storage unit 25, wherein , 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 pixel 311 includes at least one display sub-pixel of a specific color, that is, each display pixel 311 includes at least one color value. In the following description of an embodiment of the present invention, each display pixel 311 of the display frame 30 includes A red display sub-pixel, a green display sub-pixel, and a blue display sub-pixel, that is, each display pixel 311 includes a red (R) color value, a green (G) color value, and a blue (B) color value The color value, in other embodiments, the display sub-pixels in the above-mentioned display pixel 311 may also be a combination of different colors, so the present invention is not limited to the above-mentioned combination of colors of the display sub-pixels.

Further, when the driving unit 21 of the display driving device 20 drives the display panel 10 to display a current display frame 30 , the storage unit 25 stores the characteristics of each pixel row 31 of the previous display frame 30 in the storage unit 25 . The continuous color line segment information is used for the drive unit 21 to perform over-voltage driving compensation on the display pixels 311 of the current display frame 30 according to the continuous color line segment information of the previous display frame 30 stored in the storage unit 25, so that the current display The display pixels 311 of the frame 30 can reach the target brightness within a frame time, wherein the continuous color line segment information of a pixel row 31 includes the start position and end position of each continuous color line segment in the pixel row 31 , and the color value of each color (R/G/B). At the same time, the current display frame 30 is also input to the overvoltage driving data processing unit 23, and the overvoltage driving data processing unit 23 performs processing according to the current display frame 30 to generate the current display The continuous color line segment information of the frame 30 is stored in the storage unit 25 to be used as the continuous color line segment information of the previous display frame 30 during the next display frame period.

FIG. 2 shows the process of generating the continuous color line segment information of the display frame 30 by the overvoltage driving data processing unit 23 . Steps S21 - S23 are executed for each pixel row 31 of the display frame 30 . In step S21, for all the display pixels 311 in the i-th pixel row 31', from the first display pixel 311 to the last display pixel 311, the color values of two adjacent display pixels 311 are sequentially compared to obtain a continuous color value. distribution of the display pixels 311, wherein, when the difference between the total color (R/G/B) values of two adjacent display pixels 311 is less than a predetermined first threshold value T1, the adjacent two display pixels 311 are color continuous. That is, taking the two adjacent display pixels P_x and P_y in the i-th pixel row 31 ′ as an example, the R/G/B color value of the display pixel P_x is R_x/G_x/B_x, and the R/G/B color value of the display pixel P_y If the value is R_y/G_y/B_y, then when |R_x-R_y|<T1, and |G_x-G_y|<T1, and |B_x-B_y|<T1, then two adjacent display pixels P_x and P_y are color-continuous.

In step S22, according to the distribution of display pixels 311 with continuous colors obtained by comparing all display pixels 311 in the i-th pixel row 31' in step S21, when the number of display pixels 311 with continuous colors in the i-th pixel row 31' is greater than A predetermined second threshold value T2, the display pixels 311 with continuous colors form a continuous color line segment 35, as shown in FIG. 3, after this step, the i-th pixel row 31' of the display frame 30 has a plurality of Continuous color line segment 35.

In step S23, according to the continuous color line segment 35 of the i-th pixel row 31' obtained in step S22, record the start position, end position and color value of each color (R/G/B) of each continuous color line segment 35 , wherein the color value of a specific color (R, G or B) of a continuous color line segment 35 is the average of the color values of the specific color of all display pixels 311 of the continuous color line segment 35 , as shown in FIG. The i pixel row 31' has a continuous color line segment 35 with a start position of 0 and an end position of 44, and its R/G/B color value is 152/152/152, And has a continuous color line segment 35 with a start position of 45, an end position of 199, and its R/G/B color value is 400/400/400, etc.

When steps S21 to S23 are performed on each pixel row 31 of the display frame 30, the start position, end position, and each color value (R /G/B), as the continuous color line segment information of the display frame 30, for the driving unit 21 to perform over-voltage driving compensation on the display pixels of the current display frame 30, that is, according to the current display frame 30 To display the position of the pixel 311 , look up the information of the continuous color line segment of the previous display frame 30 stored in the storage unit 25 , and compare the start position and end of the continuous color line segment 35 of the corresponding pixel row 31 of the previous display frame 30 position, the color value of each color (R/G/B) of the corresponding color continuous line segment 35 can be found, which can be used as the compensation basis for the overvoltage driving of the display pixels 311 of the current display frame 30 to perform overvoltage drive compensation. For example, as shown in FIG. 5 , when a display pixel 311 in positions 0 to 44 of the i-th pixel column 31 of the current display frame 30 is displayed with R/G/B color values of 152/152/152, according to FIG. 4 The R/G/B color value of the continuous color line segment 35 whose starting position is 0 and whose ending position is 44 in the i-th pixel row 31 of the shown record is 152/152/152 for over-voltage driving compensation. After compensation, R The /G/B color value is 152/152/152. When a display pixel 311 in positions 45 to 199 of the i-th pixel row 31 of the current display frame 30 is displayed with R/G/B color values of 152/152/152, according to the i-th pixel row 31 shown in FIG. The R/G/B color value of the continuous color line segment 35 with the starting position of 45 and the end position of 199 is 400/400/400 for overvoltage drive compensation, and the R/G/B color value after compensation is 145/145 /145.

It can be seen from the above description that the present invention only needs to store the line segment information of the previous display frame to perform overvoltage driving. Since the complete frame information of the previous display frame is not stored, the memory space can be greatly saved, and the memory space can be greatly saved. Horizontal resolution is 1080, vertical resolution is 2520 For example, if each display pixel is 24 bits, and even if the data compression ratio is 3 to reduce the amount of data, the memory space required for conventional overvoltage driving is still as high as 1080×2520×24 (bits) ÷3=21.7728Mbits, and the present invention stores only the start position, end position, and color value of each color (R/G/B) of the continuous color line segment for each pixel row, and each pixel row is only 230bits are required, so the memory space required for overvoltage driving is only 2520×230(bits)=0.5796Mbits. It is obvious that the present invention can significantly save the memory space, thereby effectively increasing the possibility of productization.

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: Overvoltage drive data processing unit

25: Storage 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 each display pixel includes at least one color value, the display driving device includes: a driving unit for driving the display panel to display a current display frame; a storage unit for storing the continuous color line segment information of each pixel row of the previous display frame, wherein, The driving unit performs overvoltage driving compensation on the display pixels of the current display frame according to the continuous color line segment information of the previous display frame stored in the storage unit; and an overvoltage driving data processing unit according to the current display frame to generate continuous color line segment information corresponding to the current display frame, wherein the continuous color line segment information of a pixel row stored in the storage unit includes the start position and end position of each continuous color line segment in the pixel row , and the color value for each color. The display driving device according to claim 1, wherein the continuous color line segment information corresponding to the current display frame generated by the overvoltage driving data processing unit is further stored in the storage unit to be used as the previous display frame during the next display frame Displays continuous color line segment information for the frame. The display driving device according to claim 1, wherein the overvoltage driving data processing unit generating the continuous color line segment information of a pixel row includes: sequentially comparing the values of two adjacent display pixels for all display pixels in the pixel row. color value to obtain the distribution of display pixels with continuous color; When the number of display pixels with continuous colors on the pixel row is greater than a predetermined second threshold, a continuous color line segment is formed by the display pixels with continuous colors; and the start position and end position of each continuous color line segment are recorded. , and the color value for each color. The display driving device according to claim 3, wherein when the difference between all the color values of the two adjacent display pixels compared is less than a predetermined first threshold value, the two adjacent display pixels are of continuous color. The display driving device according to claim 3, wherein the recorded color value of a specific color of a continuous color line segment is an average of the color values of the specific color of all display pixels of the continuous color line segment. The display driving device according to claim 3, wherein the driving unit compares the start position and end of the continuous color line segment of the corresponding pixel row of the previous display frame according to the position of the display pixels of the current display frame position, to find out the color value of each color of the corresponding color continuous line segment, and use it as the compensation basis for the overvoltage driving of the display pixels of the current display frame to perform overvoltage driving compensation. The display driving device of claim 1, wherein the at least one color value includes a red color value, a green color value, and a blue color 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 , each display pixel includes at least one color value, and the display driving device includes: a driving unit for driving the display panel to display a current display frame; a storage unit, which stores the continuous color line segment information of each pixel row of the previous display frame, wherein the driving unit performs the current display according to the continuous color line segment information of the previous display frame stored in the storage unit The display pixels of the frame are compensated for overvoltage driving; and an overvoltage driving data processing unit generates continuous color line segment information corresponding to the current display frame according to the current display frame, wherein a data stored in the storage unit is The continuous color line segment information of the pixel row includes the start position, the end position, and the color value of each color of each continuous color line segment in the pixel row. The display device according to claim 8, wherein the continuous color line segment information corresponding to the current display frame generated by the overvoltage driving data processing unit of the display driving device is further stored in the storage unit, so that during the next display frame period Information as a continuous color line segment of the last displayed frame.

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