Method for controlling display device, control apparatus for display device and display device

• US 10,388,231 B2
• Filed: 01/05/2017
• Issued: 08/20/2019
• Est. Priority Date: 05/27/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhou, Chengqi, Chu, Yifang, Lai, Chengte, Li, Shou, Jung, Chulgyu
• Primary Examiner(s): Khan, Ibrahim A
• Application Number:
  US15/547,042
• Publication Number:
  US 20180218690A1
• Time in Patent Office: 957 Days
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

The present disclosure provides a method for controlling a display device, a control apparatus for a display device, and a display device comprising the control apparatus. The method for controlling a display device may comprise the steps of: determining whether or not to perform peak driving for respective backlight sub-regions of the display device, the backlight sub-regions corresponding to sub-display areas of the display device; and performing, in response to a result of the above determining step, data signal compensation at least for sub-display areas whose average luminance values are lower than a preset first luminance threshold among the sub-display areas to which the backlight sub-regions that are determined to be subjected to peak driving correspond.

Claims

1. A method for controlling a display device, comprising:

determining whether or not to perform peak driving for respective backlight sub-regions of the display device, the backlight sub-regions corresponding to sub-display areas of the display device; and

performing, in response to a result of the above determining, data signal compensation at least for sub-display areas whose average luminance values are lower than a first luminance threshold among the sub-display areas to which the backlight sub-regions that are determined to be subjected to peak driving correspond,

wherein determining whether or not to perform peak driving for respective backlight sub-regions of the display device comprises;

counting the number of pixels included in each sub-display area whose luminance exceed the second luminance threshold,

calculating an average luminance value of each sub-display area,

determining backlight sub-regions to be subjected to peak driving based on a result of the above counting step or calculating step,

wherein the method further comprises;

determining that peak driving is performed for backlight sub-regions to which a first sub-display area, a second sub-display area and a third sub-display area of the display device correspond, wherein the first sub-display area has an average luminance value greater than the first luminance threshold and includes N1 pixels whose luminance exceed the second luminance threshold, N1 being greater than a preset number threshold N0, the second sub-display area has an average luminance value greater than the first luminance threshold and includes N2 pixels whose luminance exceed the second luminance threshold, N2 being smaller than the preset number threshold N0, the third sub-display area has an average luminance value smaller than the first luminance threshold and includes N3 pixels whose luminance exceed the second luminance threshold, N3 being greater than the preset number threshold N0.

2. The method according to claim 1, wherein the method comprises:

compensating a data signal to the third sub-display area by a first data signal compensation circuit so as to adjust light transmittance of the third sub-display area.

3. The method according to claim 2, wherein for a data signal D to the third sub-display area which is smaller than a preset data signal threshold D_t, the data signal D is adjusted to D/K₁ by the first data signal compensation circuit,

for a data signal D to the third sub-display area which is greater than the data signal threshold D_t, the data signal D is adjusted to

4. The method according to claim 1, wherein the method further comprises:

performing data signal compensation for sub-display areas of the display device to which backlight sub-regions not subjected to peak driving correspond.

5. The method according to claim 4, wherein the sub-display areas to which backlight sub-regions not subjected to peak driving correspond includes a fourth sub-display area, the fourth sub-display area having an average luminance value smaller than the first luminance threshold and including N4 pixels whose luminance exceed the second luminance threshold, N4 being smaller than the preset number threshold N0,

wherein the method further comprises compensating a data signal to the fourth sub-display area by a second data signal compensation circuit so as to adjust light transmittance of the fourth sub-display area.

6. The method according to claim 5, wherein a data signal D to the fourth sub-display area is adjusted to D/K₂ by the second data signal compensation circuit, wherein K₂ is obtained by the following equation:

BL₂=BL_0·

K₂^γ

wherein BL₂ is a backlight luminance of a backlight sub-region corresponding to the fourth sub-display area after backlight adjustment, BL₀ is a default backlight luminance of a backlight sub-region corresponding to any sub-display area of the display device without backlight adjustment, γ

is a physical parameter of the display device which characterizes a distortion of an output image with respect to an input signal.

7. The method according to claim 1, wherein the step of determining whether or not to perform peak driving for respective backlight sub-regions of the display device further comprises:

calculating a power P1 required for peak driving of a backlight sub-region that is determined to be subjected to peak driving, and

comparing the required power P1 with a power threshold P0,

wherein when the required power P1 is smaller than the power threshold P0, peak driving is performed for the backlight sub-region that is determined to be subjected to peak driving, and the power threshold P0 is a power difference between a rated power or a maximum power of the display device and a power required by the display device for displaying one frame image.

8. A control apparatus for a display device, comprising:

a peak driving circuit in a backlight module for determining whether or not to perform peak driving for respective backlight sub-regions and performing peak driving for a backlight sub-region that is determined to be subjected to peak driving, the backlight sub-regions corresponding to sub-display areas of the display device; and

a data signal compensation circuit in a display panel for performing, based on a determination result from the peak driving circuit, data signal compensation at least for sub-display areas whose average luminance values are lower than a first luminance threshold among the sub-display areas to which the backlight sub-regions that are determined to be subjected to peak driving correspond,

wherein the peak driving circuit comprises;

a statistics module for counting the number of pixels included in each sub-display area whose luminance exceed the second luminance threshold;

an average luminance value calculation module for calculating an average luminance value of each sub-display area;

a determination module for determining backlight sub-regions to be subjected to peak driving based on a result from the statistics module or the average luminance value calculation module,

wherein the determination module determines that peak driving is performed for backlight sub-regions to which a first sub-display area, a second sub-display area and a third sub-display area of the display device correspond, wherein the first sub-display area has an average luminance value greater than the first luminance threshold and includes N1 pixels whose luminance exceed the second luminance threshold, N1 being greater than a preset number threshold N0, the second sub-display area has an average luminance value greater than the first luminance threshold and includes N2 pixels whose luminance exceed the second luminance threshold, N2 being smaller than the preset number threshold N0, the third sub-display area has an average luminance value smaller than the first luminance threshold and includes N3 pixels whose luminance exceed the second luminance threshold, N3 being greater than the preset number threshold N0.

9. The control apparatus according to claim 8, wherein the data signal compensation circuit comprises:

a first data signal compensation circuit for compensating a data signal to the third sub-display area so as to adjust light transmittance of the third sub-display area.

10. The control apparatus according to claim 9, wherein for a data signal D to the third sub-display area which is smaller than a preset data signal threshold D_t, the first data signal compensation circuit adjusts the data signal D to D/K₁,

for a data signal D to the third sub-display area which is greater than the data signal threshold D_t, the first data signal compensation circuit adjusts the data signal D to

11. The control apparatus according to claim 8, wherein the data signal compensation circuit further performs data signal compensation for sub-display areas of the display device to which backlight sub-regions not subjected to peak driving correspond.

12. The control apparatus according to claim 11, wherein the sub-display areas to which backlight sub-regions not subjected to peak driving correspond includes a fourth sub-display area, the fourth sub-display area having an average luminance value smaller than the first luminance threshold and including N4 pixels whose luminance exceed the second luminance threshold, N4 being smaller than the preset number threshold N0, wherein the data signal compensation circuit comprises a second data signal compensation circuit for compensating a data signal to the fourth sub-display area so as to adjust light transmittance of the fourth sub-display area.

13. The control apparatus according to claim 12, wherein the second data signal compensation circuit adjusts the data signal D to the fourth sub-display area to D/K₂, wherein K₂ is obtained by the following equation:

BL₂ =BL_0·

K₂^γ

wherein BL₂ is a backlight luminance of a backlight sub-region corresponding to the fourth sub-display area after backlight adjustment, BL₀ is a default backlight luminance of a backlight sub-region corresponding to any sub-display area of the display device without backlight adjustment, γ

is a physical parameter of the display device which characterizes a distortion of an output image with respect to an input signal.

14. The control apparatus according to claim 8, wherein the peak driving circuit further comprises:

a power calculation module for calculating a power P1 required for peak driving of a backlight sub-region that is determined to be subjected to peak driving;

a comparison module for comparing the required power P1 with a power threshold P0;

wherein when the required power P1 is smaller than the power threshold P0, the peak driving circuit performs peak driving for the backlight sub-region that is determined to be subjected to peak driving, and the power threshold P0 is a power difference between a rated power or a maximum power of the display device and a power required by the display device for displaying one frame image.