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

Abstract

A display driving device includes a driving unit, a storage unit and an overvoltage driving data processing unit. The driving unit drives a display panel to display a current display frame; the storage unit stores continuous color line segment information of each pixel row of the previous display frame, 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 the overvoltage driving data processing unit generates continuous color line segment information corresponding to the current display frame according to the current display frame.

Description

Technical Field

[0001] The present invention relates to the technical field of display driving, and in particular to a display driving device with overvoltage driving and a display device comprising the same. Background Art

[0002] When the display panel switches between display frames, if the display panel response time is not fast enough, the display pixels of the new display frame will not reach the target brightness within the time of one display frame, thus causing image sticking. Taking a 60Hz frame rate as an example, the response time of the pixel unit of the display panel must be within 16.6ms to display the new display pixels in real time, otherwise image sticking will occur.

[0003] Since the response time of liquid crystal display (LCD) panels is generally not fast enough, overdrive technology is needed to accelerate the liquid crystal flipping. Although organic light emitting diode (OLED) panels have a fast response time, for some extreme color conversions, such as when all black pixels are converted to all white pixels, their response time may still be slower than 16.6ms, resulting in image sticking.

[0004] The existing overvoltage driving technology needs to additionally store the complete frame information of the previous display frame, so that when displaying the current display frame, the display pixels of the current display frame are compared one by one with the display pixels of the stored previous display frame to perform overvoltage driving. That is, during the period of the previous display frame, the data of the entire display frame needs to be stored for comparison and table lookup compensation of each display pixel of the next display frame. The large amount of memory space required makes the existing overvoltage driving technology difficult to apply to most display panels, and the high cost of the driver chip makes it difficult to apply to non-high-end products.

[0005] Therefore, there are still many deficiencies in the design of overvoltage driving of the existing display panel, and there is a need for improvement. Summary of the invention

[0006] 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 by only storing line segment information of the previous display frame, thereby greatly saving memory space and increasing the possibility of productization.

[0007] According to one 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, wherein 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, driving the display panel to display a current display frame; a storage unit, storing continuous color line segment information of each pixel row of a previous display frame, wherein the driving unit performs overvoltage drive 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 drive data processing unit, generating continuous color line segment information corresponding to the current display frame according to the current display frame.

[0008] According to another feature of the present invention, a display device is provided, including: 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 having a plurality of pixel rows, each pixel row having a plurality of display pixels, each display pixel including at least one color value, the display driving device including: a driving unit, driving the display panel to display a current display frame; a storage unit, storing continuous color line segment information of each pixel row of a previous display frame, wherein the driving unit performs overvoltage drive 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 drive data processing unit, generating continuous color line segment information corresponding to the current display frame according to the current display frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram showing a display device of the present invention.

[0010] Figure 2 The flowchart of the overvoltage driving data processing unit generating the continuous color line segment information of the display frame according to the present invention is shown.

[0011] Figure 3 The pixel rows of the display frame according to the present invention have a plurality of continuous color segments.

[0012] Figure 4 A recorded example of a pixel row according to the present invention is shown.

[0013] Figure 5 An example of over-drive compensation of a pixel row according to the present invention is shown.

[0014] Display panel 10

[0015] Display driving device 20

[0016] Drive unit 21

[0017] Overvoltage drive data processing unit 23

[0018] Storage unit 25

[0019] Display frame 30

[0020] Pixel columns 31, 31'

[0021] Display Pixels 311

[0022] Continuous color line segment 35

[0023] Steps S21 to S23 DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the implementation of the present invention and are not intended to limit the present invention.

[0025] Figure 1 A schematic diagram of a display device of the present invention is shown, which includes a display panel 10 and a display driving device 20. The display driving device 20 includes a driving unit 21, an overvoltage driving data processing unit 23, and a storage unit 25. The display driving device 20 is used to drive the display panel 10 to display a display frame 30 on the display panel 10. The display frame 30 includes a plurality of pixel rows 31. Each pixel row 31 includes a plurality of display pixels 311. 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. In other embodiments, the display sub-pixels in the display pixel 311 may also be a combination of different colors. Therefore, the present invention is not limited to the combination of colors of the display sub-pixels.

[0026] Furthermore, when the driving unit 21 of the display driving device 20 drives the display panel 10 to display a current display frame 30, the continuous color segment information of each pixel column 31 of the previous display frame 30 is stored in the storage unit 25. The driving unit 21 performs over-driving compensation on the display pixels 311 of the current display frame 30 according to the continuous color segment information of the previous display frame 30 stored in the storage unit 25, so that the display pixels 311 of the current display frame 30 can reach the target brightness within the time of one frame. Among them, the continuous color segment information of a pixel column 31 includes the starting position, ending position, and color value of each color (R / G / B) of each continuous color segment in the pixel column 31. At the same time, the current display frame 30 is also input to the over-driving data processing unit 23, and the over-driving data processing unit 23 processes it according to the current display frame 30 to generate the continuous color segment information of the current display frame 30, and stores it in the storage unit 25 for use as the continuous color segment information of the previous display frame 30 during the next display frame period.

[0027] Figure 2 The process of the over-driving data processing unit 23 for the display generating the continuous color segment information of the display frame 30 is to execute steps S21 - S23 for each pixel column 31 of the display frame 30. In step S21, for all the display pixels 311 of the i-th pixel column 31', from the first display pixel 311 to the last display pixel 311, the color values of adjacent two display pixels 311 are compared in sequence to obtain the distribution of the display pixels 311 with continuous colors. Among them, when the difference between the color values of all colors (R / G / B) of adjacent two display pixels 311 is less than a preset first threshold value T1, then these adjacent two display pixels 311 are color continuous. That is, taking two adjacent display pixels P_x and P_y in the i-th pixel column 31' as an example, the R / G / B color values of the display pixel P_x are R_x / G_x / B_x, and the R / G / B color values of the display pixel P_y are 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, the adjacent two display pixels P_x and P_y are color continuous.

[0028] In step S22, according to the distribution of the display pixels 311 with continuous colors obtained by comparing all the display pixels 311 of the i-th pixel column 31' in step S21, when the number of the display pixels 311 with continuous colors on the i-th pixel column 31' is greater than a preset second threshold value T2, then these display pixels 311 with continuous colors form a continuous color segment 35, as Figure 3 shown. Through this step, the i-th pixel column 31' of the display frame 30 has a plurality of continuous color segments 35.

[0029] In step S23, the starting position, the ending position, and the color value of each color (R / G / B) of each continuous color segment 35 are recorded according to the continuous color segment 35 of the i-th pixel row 31′ obtained in step S22, wherein the color value of a specific color (R, G or B) of a continuous color segment 35 is the average color value of the specific color of all display pixels 311 of the continuous color segment 35, such as Figure 4 The example shows that the i-th pixel row 31' has a continuous color line segment 35 with a starting position of 0 and an ending position of 44, and its R / G / B color values ​​are 152 / 152 / 152, and has a continuous color line segment 35 with a starting position of 45 and an ending position of 199, and its R / G / B color values ​​are 400 / 400 / 400, etc.

[0030] When steps S21 to S23 are performed on each pixel row 31 of the display frame 30, the starting position, the ending position, and the color value of each color value (R / G / B) of each continuous color segment 35 of each pixel row 31 can be recorded as the continuous color segment information of the display frame 30, so that the driving unit 21 can perform overvoltage drive compensation on the display pixels of the current display frame 30. That is, according to the position of the display pixel 311 of the current display frame 30, the continuous color segment information of the previous display frame 30 stored in the storage unit 25 is searched, and by comparing the starting position and the ending position of the continuous color segment 35 of the corresponding pixel row 31 of the previous display frame 30, the color value of each color (R / G / B) of the corresponding continuous color segment 35 can be found out, so as to serve as the compensation basis for the overvoltage drive of the display pixel 311 of the current display frame 30, so as to perform overvoltage drive compensation. For example, Figure 5 As shown, when a display pixel 311 in position 0-44 of the i-th pixel row 31 of the current display frame 30 has an R / G / B color value of 152 / 152 / 152, according to Figure 4 The R / G / B color values ​​of the continuous color line segment 35 of the i-th pixel row 31 with the starting position 0 and the ending position 44 are 152 / 152 / 152 for overvoltage drive compensation, and the compensated R / G / B color values ​​are 152 / 152 / 152. When a display pixel 311 at the position 45-199 of the i-th pixel row 31 of the current display frame 30 has an R / G / B color value of 152 / 152 / 152, according to Figure 4 The R / G / B color values ​​of the continuous color line segment 35 with the starting position 45 and the ending position 199 of the i-th pixel row 31 are 400 / 400 / 400 for overvoltage driving compensation, and the compensated R / G / B color values ​​are 145 / 145 / 145.

[0031] As can be seen from the above description, the present invention only needs to store the line segment information of the previous display frame to perform overvoltage driving. Since the storage of the complete frame information of the previous display frame is eliminated, the memory space can be greatly saved. Taking a display device with a horizontal resolution of 1080 and a vertical resolution of 2520 as an example, if each display pixel is 24 bits, and even if a data compression ratio of 3 is used to reduce the amount of data, the memory space required for the existing overvoltage driving is still as high as 1080×2520×24 (bits) ÷ 3 = 21.7728 Mbits. However, since the present invention only stores the starting position, the ending position, and the color value of each color (R / G / B) of the continuous color line segment for each pixel row, and each pixel row only needs 230 bits on average, the memory space required for the overvoltage driving is only 2520×230 (bits) = 0.5796 Mbits. It is obvious that the present invention can indeed greatly save memory space, thereby effectively increasing the possibility of productization.

[0032] The above embodiments are merely examples for the convenience of description. The scope of rights claimed by the present invention should be based on the claims, but not limited to the above embodiments.

Claims

1. A display driving device for driving a display panel to display a display frame on the display panel, wherein the display frame has a plurality of pixel rows, each pixel row has a plurality of display pixels, each display pixel includes at least one color value, wherein: The display driving device comprises: a driving unit, driving the display panel to display a current display frame; a storage unit storing continuous color line segment information of each pixel row of a previous display frame, wherein the driving unit performs overvoltage driving compensation on display pixels of a 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, generating continuous color line segment information corresponding to the current display frame according to the current display frame, The continuous color line segment information of a pixel row stored in the storage unit includes the starting position, the ending position, and the color value of each color of each continuous color line segment in the pixel row. The overvoltage driving data processing unit generates continuous color line segment information of a pixel row including: For all display pixels of the pixel column, color values ​​of two adjacent display pixels are sequentially compared to obtain a distribution of display pixels with continuous colors; When the number of display pixels with continuous colors on the pixel row is greater than a preset second threshold value, these display pixels with continuous colors form a continuous color line segment; and Record the starting position, ending position, and color value of each continuous color line segment.

2. 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 stored in the storage unit to be used as the continuous color line segment information of the previous display frame during the next display frame.

3. The display driving device according to claim 1, wherein: When the difference between all color values ​​of two adjacent display pixels being compared is less than a preset first threshold value, the two adjacent display pixels are color-continuous.

4. The display driving device according to claim 1, wherein: The recorded color value of a color of a continuous color line segment is the average color value of the color of all display pixels of the continuous color line segment.

5. The display driving device according to claim 1, wherein: The driving unit compares the starting position and the ending position of the continuous color line segment of the corresponding pixel row of the previous display frame according to the position of the display pixel of the current display frame to find out the color value of each color of the corresponding color continuous line segment, so as to perform overvoltage drive compensation as a compensation basis for the overvoltage drive of the display pixel of the current display frame.

6. The display driving device according to claim 1, wherein: The at least one color value includes a red color value, a green color value, and a blue color value.

7. A display device, comprising: a display panel; as well as A display driving device drives the display panel to display a display frame on the display panel, wherein 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, wherein the display driving device comprises: a driving unit driving the display panel to display a current display frame; a storage unit storing continuous color line segment information of each pixel row of a previous display frame, 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 processing unit, generating continuous color line segment information corresponding to the current display frame according to the current display frame, The continuous color line segment information of a pixel row stored in the storage unit includes the starting position, the ending position, and the color value of each color of each continuous color line segment in the pixel row. The overvoltage driving data processing unit generates continuous color line segment information of a pixel row including: For all display pixels of the pixel column, color values ​​of two adjacent display pixels are sequentially compared to obtain a distribution of display pixels with continuous colors; When the number of display pixels with continuous colors on the pixel row is greater than a preset second threshold value, these display pixels with continuous colors form a continuous color line segment; and Record the starting position, ending position, and color value of each continuous color line segment.

8. The display device according to claim 7, 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 stored in the storage unit to be used as the continuous color line segment information of the previous display frame during the next display frame.

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