DISPLAY APPARATUS AND METHOD FOR DRIVING SAME

• US 20200135122A1
• Filed: 01/28/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: SONG, Wonseok, Kim, Shinhaeng, Jung, Yoosun
• Granted Patent: US 10,902,799 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/106 Determination of movement vectors or equivalent parameters within the image
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/141 the light conveying information used for selecting or modulating the light emitting or modulating element
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A display apparatus is provided. The display apparatus includes a display panel; a backlight including a plurality of backlight blocks; and a processor configured to: identify a duty cycle of a driving signal for driving each of the plurality of backlight blocks; drive the backlight based on the duty cycle of the driving signal; identify a motion blur occurrence area in an input image; identify an adjusted duty cycle by adjusting the duty cycle of at least one backlight block from among the plurality of backlight blocks that corresponds to the motion blur occurrence area; and adjust a current of the driving signal based on the adjusted duty cycle.

Claims

1. A display apparatus, comprising:

a display panel;

a backlight including a plurality of backlight blocks; and

a processor configured to;

identify a duty cycle of a driving signal for driving each of the plurality of backlight blocks;

drive the backlight based on the duty cycle of the driving signal;

identify a motion blur occurrence area in an input image;

identify an adjusted duty cycle by adjusting the duty cycle of at least one backlight block from among the plurality of backlight blocks that corresponds to the motion blur occurrence area; and

adjust a current of the driving signal based on the adjusted duty cycle.

2. The display apparatus as claimed in claim 1, wherein the processor is further configured to reduce the duty cycle of the at least one backlight block corresponding to the motion blur occurrence area and increase the current of the driving signal.

3. The display apparatus as claimed in claim 1, wherein the processor is further configured to identify the motion blur occurrence area based on motion information, image characteristic information and brightness information of the input image.

4. The display apparatus as claimed in claim 1, wherein the image characteristic information comprises at least one among edge information and texture information.

5. The display apparatus as claimed in claim 3, wherein the processor is further configured to identify the brightness information based on pixel information of the input image and a light emission characteristic of the display panel.

6. The display apparatus as claimed in claim 3, wherein the processor is further configured to:

identify a plurality of block areas of the input image; and

identify the motion blur occurrence area based on motion information, image characteristic information and brightness information of each of the plurality of block areas.

7. The display apparatus as claimed in claim 3, wherein the processor is further configured to:

obtain motion information, image characteristic information and brightness information from a first block area of a plurality of block areas of the input image;

obtain motion blur information based on the motion information, the image characteristic information and the brightness information; and

identify the motion blur occurrence area based on the motion blur information.

8. The display apparatus as claimed in claim 7, wherein the processor is further configured to obtain the motion blur information by calculating a motion blur value based on each of the motion information, the image characteristic information and the brightness information, apply a weight to the motion blur value, and multiply the motion blur values to which the weight is applied by one another.

9. The display apparatus as claimed in claim 1, wherein the processor is further configured to drive the backlight by sequentially reducing the duty cycle for each frame interval of the motion blur occurrence area and sequentially increasing the current of the driving signal.

10. The display apparatus as claimed in claim 1, wherein the display panel is a liquid crystal panel.

11. A method for driving a display apparatus including a display panel and a backlight which includes a plurality of backlight blocks, the method comprising:

identifying a duty cycle of a driving signal for driving each of the plurality of backlight blocks;

identifying a motion blur occurrence area in an input image;

identifying an adjusted duty cycle by adjusting the duty cycle of at least one backlight block from among the plurality of backlight blocks that corresponds to the motion blur occurrence area;

identifying an adjusted current of the driving signal based on the adjusted duty cycle; and

driving the backlight based on the adjusted duty cycle and the adjusted current.

12. The method as claimed in claim 11, wherein the driving the backlight comprises:

reducing the duty cycle of the at least one backlight block corresponding to the motion blur occurrence area; and

increasing a current of the driving signal to identify the adjusted current.

13. The method as claimed in claim 11, wherein the identifying the motion blur occurrence area comprises identifying the motion blur occurrence area based on motion information, image characteristic information and brightness information of the input image.

14. The method as claimed in claim 13, wherein the image characteristic information comprises at least one of edge information and text information.

15. The method as claimed in claim 13, wherein the identifying the motion blur occurrence area comprises identifying the brightness information based on pixel information of the input image and a light emission characteristic of the display panel.

16. The method as claimed in claim 13, wherein the identifying the motion blur occurrence area comprises:

identifying a plurality of block areas of the input image; and

identifying the motion blur occurrence area based on motion information, image characteristic information and brightness information of each of the plurality of block areas.

17. An apparatus comprising:

an interface configured to receive an image signal;

a backlight driver configured to drive a plurality of backlight blocks of a backlight; and

a processor configured to;

identify a first block from among the plurality of backlight blocks corresponding to a motion blur occurrence area in the image signal; and

control the backlight driver to drive the first block at a first voltage level and a first duty cycle, and drive a second block from among the plurality of backlight blocks at a second voltage level and a second duty cycle.

18. The apparatus as claimed in claim 17, wherein the first voltage level is greater than the second voltage level.

19. The apparatus as claimed in claim 18, wherein the first duty cycle is less than the second duty cycle.

20. The apparatus as claimed in claim 17, wherein the processor is further configured to identify the motion blur occurrence area based on a plurality of frames of the image signal.