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KR-102963756-B1 - DISPLAY DEVICE

KR102963756B1KR 102963756 B1KR102963756 B1KR 102963756B1KR-102963756-B1

Abstract

The display device may include a display panel comprising pixels and a display panel driver that drives the display panel. The display panel driver determines a predicted on-pixel ratio of the current frame based on an artificial neural network model and input image data of a previous frame, determines a first adjustment value based on the predicted on-pixel ratio, and can adjust the brightness of the current frame based on the first adjustment value.

Inventors

  • 김학규

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260513
Application Date
20220204

Claims (20)

  1. A display panel including pixels; and It includes a display panel driving unit that drives the above display panel, and The above display panel driving unit determines a predicted on-pixel ratio of the current frame based on an artificial neural network model and input image data of the previous frame, determines a first adjustment value based on the predicted on-pixel ratio, and adjusts the brightness of the current frame based on the first adjustment value. The above display panel includes a first area, a second area, and a third area that sequentially display images, and A display device characterized by the above-described display panel driving unit reducing the brightness of the first region by the first adjustment value, calculating the first on-pixel ratio of the first region based on the input image data of the current frame for the first region, reducing the brightness of the second region using the first on-pixel ratio, calculating the second on-pixel ratio of the first region and the second region based on the input image data of the current frame for the first region and the second region, and reducing the brightness of the third region using the second on-pixel ratio.
  2. A display device according to claim 1, characterized in that the weights of the artificial neural network model are corrected based on the input image data of each frame.
  3. In claim 2, the artificial neural network model determines the predicted on-pixel ratio as probabilities for on-pixel ratios, and A display device characterized in that the above-described display panel driving unit determines the first adjustment value based on reference adjustment values and probabilities according to the above-described on-pixel ratios.
  4. A display device according to claim 3, wherein the display panel driving unit determines the first adjustment value by summing the products of the probabilities and the reference adjustment values.
  5. In claim 1, the display panel driving unit A display device characterized by reducing the brightness of the second region by a reference adjustment value corresponding to the first on-pixel ratio.
  6. delete
  7. A display device according to claim 5, wherein the display panel driving unit reduces the brightness of the third region by a reference adjustment value corresponding to the second on-pixel ratio.
  8. In claim 1, the display panel driving unit Calculate a first difference value between the first adjustment value and a reference adjustment value corresponding to the first on-pixel ratio, determine a second adjustment value by adding the product of the first difference value and a first coefficient to the first adjustment value, and reduce the brightness of the second region by the second adjustment value. A display device characterized by calculating a second difference value between a first adjustment value and a reference adjustment value corresponding to a second on-pixel ratio, determining a third adjustment value by adding the product of the second difference value and a second coefficient to the first adjustment value, and reducing the brightness of the third region by the amount of the third adjustment value.
  9. delete
  10. A display device according to claim 8, characterized in that the second coefficient is 1 when the third region includes the pixel row where the image is last displayed in the current frame.
  11. In claim 8, the first coefficient and the second coefficient are greater than 0 and less than or equal to 1, and A display device characterized in that the second coefficient is greater than the first coefficient.
  12. A display panel including pixels; and It includes a display panel driving unit that drives the above display panel, and The above display panel driving unit includes a first adjustment value look-up table storing a first adjustment value according to input image data of a previous frame, and includes an artificial neural network model that predicts the on-pixel ratio of a current frame based on the input image data of the previous frame, updates the first adjustment value look-up table using the artificial neural network model, and adjusts the brightness of the current frame based on the first adjustment value. The above display panel includes a first area, a second area, and a third area that sequentially display images, and A display device characterized by the above-described display panel driving unit reducing the brightness of the first region by the first adjustment value, calculating the first on-pixel ratio of the first region based on the input image data of the current frame for the first region, reducing the brightness of the second region using the first on-pixel ratio, calculating the second on-pixel ratio of the first region and the second region based on the input image data of the current frame for the first region and the second region, and reducing the brightness of the third region using the second on-pixel ratio.
  13. A display device according to claim 12, characterized in that the weights of the artificial neural network model are corrected based on the input image data of each frame.
  14. A display device according to claim 12, wherein the display panel driving unit reduces the brightness of the second region by a reference adjustment value corresponding to the first on-pixel ratio.
  15. delete
  16. A display device according to claim 14, wherein the display panel driving unit reduces the brightness of the third region by a reference adjustment value corresponding to the second on-pixel ratio.
  17. In claim 12, the display panel driving unit Calculate a first difference value between the first adjustment value and a reference adjustment value corresponding to the first on-pixel ratio, determine a second adjustment value by adding the product of the first difference value and a first coefficient to the first adjustment value, and reduce the brightness of the second region by the second adjustment value. A display device characterized by calculating a second difference value between a first adjustment value and a reference adjustment value corresponding to a second on-pixel ratio, determining a third adjustment value by adding the product of the second difference value and a second coefficient to the first adjustment value, and reducing the brightness of the third region by the amount of the third adjustment value.
  18. delete
  19. A display device according to claim 17, characterized in that the second coefficient is 1 when the third region includes the pixel row where the image is last displayed in the current frame.
  20. In claim 17, the first coefficient and the second coefficient are greater than 0 and less than or equal to 1, and A display device characterized in that the second coefficient is greater than the first coefficient.

Description

Display Device The present invention relates to a display device. More specifically, it relates to a display device that controls brightness based on the on-pixel ratio. Generally, a display device includes a display panel, a gate driver, a data driver, and a driving control unit. The display panel includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels electrically connected to the plurality of gate lines and the plurality of data lines. The gate driver provides gate signals to the gate lines, the data driver provides data voltages to the data lines, and the driving control unit controls the gate driver and the data driver. To reduce the power consumption of a display device, an automatic current limitation (ACL) method that adjusts brightness based on the on-pixel ratio (OPR) of the image displayed on the display device may be used. However, since current automatic current limitation methods calculate the on-pixel ratio of one frame and then adjust the brightness in the next frame, extreme changes in brightness may be visible. FIG. 1 is a block diagram showing a display device according to embodiments of the present invention. Figure 2 is a block diagram showing an example of a driving control unit of the display device of Figure 1. Figure 3 is a graph showing an example of a second control value, a third control value, and a fourth control value. Figure 4 is a conceptual diagram showing an example of how the display device of Figure 1 controls brightness. FIG. 5 is a conceptual diagram showing an example of a display device controlling brightness according to embodiments of the present invention. FIG. 6 is a conceptual diagram showing an example of a display device controlling brightness according to embodiments of the present invention. FIG. 7 is a block diagram showing a display device according to embodiments of the present invention. FIG. 8 is a block diagram showing an example of a driving control unit of the display device of FIG. 7. FIG. 9 is a block diagram showing an electronic device according to embodiments of the present invention. Figure 10 is a diagram showing an example in which the electronic device of Figure 11 is implemented as a smartphone. Hereinafter, the present invention will be described in more detail with reference to the attached drawings. FIG. 1 is a block diagram showing a display device (1100) according to embodiments of the present invention. Referring to FIG. 1, a display device (1100) may include a display panel (100) and a display panel driver (10). The display panel driver (10) may include a driving control unit (201), a gate driver (300), and a data driver (400). In one embodiment, the driving control unit (201) and the data driver (400) may be integrated on a single chip. The display panel (100) may include a display portion (AA) for displaying images and a peripheral portion (PA) positioned adjacent to the display portion (AA). In one embodiment, a gate driving portion (300) may be mounted on the peripheral portion (PA). A display panel (100) may include a plurality of gate lines (GL), a plurality of data lines (DL), and a plurality of pixels (P) electrically connected to the gate lines (GL) and the data lines (DL). The gate lines (GL) may extend in a first direction (D1), and the data lines (DL) may extend in a second direction (D2) that intersects the first direction (D1). The drive control unit (201) can receive input image data (IMG) and input control signals (CONT) from a host processor (e.g., a graphic processing unit (GPU), etc.). For example, the input image data (IMG) may include red image data, green image data, and blue image data. In one embodiment, the input image data (IMG) may further include white image data. In another example, the input image data (IMG) may include magenta image data, yellow image data, and cyan image data. The input control signals (CONT) may include a master clock signal and a data enable signal. The input control signals (CONT) may further include a vertical synchronization signal and a horizontal synchronization signal. The drive control unit (201) can generate a first control signal (CONT1), a second control signal (CONT2), and output image data (OIMG) based on input image data (IMG) and an input control signal (CONT). The drive control unit (201) can generate a first control signal (CONT1) for controlling the operation of the gate drive unit (300) based on an input control signal (CONT) and output it to the gate drive unit (300). The first control signal (CONT1) may include a vertical start signal and a gate clock signal. The drive control unit (201) can generate a second control signal (CONT2) to control the operation of the data drive unit (400) based on an input control signal (CONT) and output it to the data drive unit (400). The second control signal (CONT2) may include a horizontal start signal and a load signal. The drive control unit (201) can receive input image data (IMG) and an input