Method for improving display effect of display panel and display panel

• US 10,636,358 B2
• Filed: 10/21/2017
• Issued: 04/28/2020
• Est. Priority Date: 09/20/2017
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
• Original Assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
• Inventors: He, Jian, Jou, Ming-jong
• Primary Examiner(s): Pham, Long D
• Application Number:
  US15/744,753
• Publication Number:
  US 20190088203A1
• Time in Patent Office: 920 Days
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2310/0264 Details of driving circuits
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]

Abstract

A method for improving display panel display effect and a display panel are disclosed, the method includes: pre-acquiring an external compensation lookup table corresponding to each pixel grayscale 255 in the display panel; introducing the external compensation lookup table to the storage unit and replacing the data corresponding to an original grayscale 255 in the preset voltage table; driving the PWM driving circuit according to a replaced data. It combines the external compensation method to improve the display effect of the PWM digital drive and avoids the problem that the PWM circuit cannot eliminate the unevenness of the display panel in the grayscale 255 and enhance the actual display effect of the display panel.

Claims

1. A method for improving display effect of a display panel, the display panel comprising a PWM (Pulse Width Modulation) driving circuit and a memory chip, the memory chip storing a preset voltage table corresponding to a different grayscale of the PWM driving circuit, wherein the method comprises:

driving the PWM driving circuit according to the preset voltage table;

acquiring a corresponding voltage at a grayscale 255 from the preset voltage table stored by the memory chip;

external compensating a display image of the grayscale 255 to respectively acquire an external compensation lookup table of the grayscale 255 in different sub-pixels;

introducing the external compensation lookup table to the memory chip and replacing a data corresponding to an original grayscale 255 in the preset voltage table;

acquiring a corresponding voltage from the external compensation lookup table and controlling a corresponding driving voltage outputted from the PWM driving circuit, when a pixel value is grayscale 255.

2. The method for improving display effect of a display panel according to claim 1, wherein the external compensation lookup table comprises a bright state voltage value corresponding to the grayscale 255.

3. The method for improving display effect of a display panel according to claim 1, wherein a dark state voltage value in the preset voltage table is the voltage value corresponding to a grayscale 0.

4. The method for improving display effect of a display panel according to claim 1, wherein after the step of introducing the external compensation lookup table to the memory chip and replacing a data corresponding to an original grayscale 255 in the preset voltage table, further comprises:

acquiring a corresponding voltage from the preset voltage table according to the acquired pixel value, when the pixel value is grayscale 0 to 254;

controlling the corresponding driving voltage outputted from the PWM driving circuit.

5. The method for improving display effect of a display panel according to claim 1, wherein the display panel is an OLED display panel.

6. The method for improving display effect of a display panel according to claim 1, wherein the pixel comprises RGB sub-pixel.

7. The method for improving display effect of a display panel according to claim 1, wherein the pixel comprises RGBW sub-pixel.

8. A method for improving display effect of a display panel, the display panel comprising a PWM (Pulse Width Modulation) driving circuit and a memory chip, the memory chip storing a preset voltage table corresponding to a different grayscale of the PWM driving circuit, wherein the method comprises:

pre-acquiring an external compensation lookup table corresponding to the grayscale 255 of each pixel in the display panel;

introducing the external compensation lookup table to the memory chip and replacing a data corresponding to an original grayscale 255 in the preset voltage table;

driving the PWM driving circuit according to the replaced data.

9. The method for improving display effect of a display panel according to claim 8, wherein the external compensation lookup table comprises a bright state voltage value corresponding to the grayscale 255.

10. The method for improving display effect of a display panel according to claim 8, wherein the dark state voltage value in the preset voltage table is the voltage value corresponding to the grayscale 0.

11. The method for improving display effect of a display panel according to claim 8, wherein the step of pre-acquiring an external compensation lookup table corresponding to each pixel grayscale 255 in the display panel, specifically comprising:

driving the PWM driving circuit according to the preset voltage table;

acquiring a corresponding voltage at the grayscale 255 from the preset voltage table stored in the storage;

external compensating a display image of the grayscale 255 to respectively acquire the external compensation lookup table of the grayscale 255 in different sub-pixels.

12. The method for improving display effect of a display panel according to claim 8, wherein the step of driving the PWM driving circuit according to the replaced data, further comprises:

acquiring the corresponding voltage from the preset voltage table according to acquired pixel value and controlling the PWM driving circuit outputting the corresponding driving voltage, when the pixel value is grayscale 0 to 254.

13. The method for improving display effect of a display panel according to claim 8, wherein the step of driving the PWM driving circuit according to the replaced data, specifically comprising:

acquiring the corresponding voltage from the external compensation lookup table and controlling the PWM driving circuit outputting the corresponding driving voltage, when the pixel value is grayscale 255.

14. The method for improving display effect of a display panel according to claim 8, wherein the display panel is an OLED display panel.

15. The method for improving display effect of a display panel according to claim 8, wherein the pixel comprises RGB sub-pixel.

16. The method for improving display effect of a display panel according to claim 8, wherein the pixel comprises RGBW sub-pixel.

17. A display panel, wherein the display panel comprises a PWM (Pulse Width Modulation) driving circuit and a storage circuit and a controller, the controller is electrically connected to the PWM driving circuit and the storage circuit, respectively, the storage circuit is used to storage a preset voltage table corresponding to a different grayscale of the PWM driving circuit,

the controller is used to pre-acquire an external compensation lookup table corresponding to each pixel grayscale 255 in the display panel;

introduce the external compensation lookup table into the storage circuit and replace the data corresponding to the original grayscale 255 in the preset voltage table; and

further used to acquire a corresponding voltage from the external compensation lookup table and control the PWM driving circuit outputting the corresponding driving voltage, when the pixel value is grayscale 255.

18. The display panel according to claim 17, wherein the display panel is an OLED display panel.

19. The display panel according to claim 17, wherein the pixel comprises RGB sub-pixel.

20. The display panel according to claim 17, wherein the pixel comprises RGBW sub-pixel.