BACKLIGHT CONTROL METHODS OF LIQUID CRYSTAL DEVICES (LCDS), BACKLIGHT CONTROL DEVICES, AND LCDS

• US 20170345379A1
• Filed: 07/29/2016
• Published: 11/30/2017
• Est. Priority Date: 05/25/2016
• Status: Abandoned Application

• Current Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: GUO, Xingling, TAN, Xiaoping, QIN, Jiehui
• Application Number:
  US15/224,455
• Publication Number:
  US 20170345379A1
• Time in Patent Office: Days
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

The present disclosure relates to a backlight control method of LCDs. The method includes dividing an effective display area of the LCD into a plurality of sub-display areas along a predetermined direction, obtaining an average brightness of display images of each of the sub-display areas, and adjusting a backlight brightness of the LCD in accordance with the average brightness of the display images of each of the sub-display areas. As such, the backlight brightness of the LCD within each of image display periods is compatible with the average brightness of the displayed images of each of the sub-display areas. The present disclosure also relates to a LCD and the backlight control method thereof. The effective display area of the LCD is divided into a plurality of display areas.

Claims

1. A backlight control method of liquid crystal devices (LCDs), comprising:

dividing an effective display area of the LCD into a plurality of sub-display areas along a predetermined direction;

obtaining an average brightness of display images of each of the sub-display areas; and

adjusting a backlight brightness of the LCD in accordance with the average brightness of the display images of each of the sub-display areas, such that the backlight brightness of the LCD within each of image display periods is compatible with the average brightness of the displayed images of each of the sub-display areas.

2. The backlight control method as claimed in claim 1, wherein the step of adjusting the backlight brightness of the LCD in accordance with the average brightness of the display images of each of the sub-display areas further comprises:

within the image display periods of each of the sub-display areas, generating adjustment signals and synchronous signals corresponding to the averaged brightness of the displayed images of each of the sub-display areas;

adjusting the backlight brightness of the LCD in accordance with the adjustment signals and the synchronous signals such that within each of the image display periods, the backlight brightness of the LCD is compatible with the average brightness of each of the displayed images of the sub-display areas.

3. The backlight control method as claimed in claim 2, wherein the adjustment signals are level signals.

4. The backlight control method as claimed in claim 1, wherein the step of dividing the effective display area of the LCD into a plurality of sub-display areas along a predetermined direction further comprises:

dividing the effective display area of the LCD into a plurality of sub-display areas along a top-down direction.

5. A backlight control device of LCDs, comprising:

a display area division module configured to divide an effective display area of the LCD into a plurality of sub-display areas along the predetermined direction;

a brightness obtaining module configured to obtain an average brightness of displayed image of each of the sub-display areas; and

a backlight adjustment module configured to adjust a backlight brightness of the LCD in accordance with the average brightness of the display images of each of the sub-display areas, such that the backlight brightness of the LCD within each of the image display periods is compatible with the average brightness of the displayed images of each of the sub-display areas.

6. The backlight control device as claimed in claim 5, wherein the backlight control module comprises:

a signal generator configured to generate corresponding adjustment signals and synchronous signals in accordance with the averaged brightness of the displayed image of the sub-display area within each of the image display periods of each of the sub-display areas;

a backlight adjustor configured to adjust the backlight brightness of the LCD in accordance with the adjustment signals and the synchronous signals such that the backlight brightness of the LCD is compatible with the average brightness of the displayed images of each of the sub-display areas within each of the image display periods of each of the sub-display areas.

7. The backlight control device as claimed in claim 6, wherein the adjustment signals are level signals.

8. The backlight control device as claimed in claim 5, wherein the display area division module is configured to divide the effective display area of the LCD into a plurality of sub-display areas along a top-down direction.

9. A LCD, wherein a backlight of the LCD is adjusted by backlight control method, the backlight control method comprising:

dividing an effective display area of the LCD into a plurality of sub-display areas along a predetermined direction;

obtaining an average brightness of display images of each of the sub-display areas; and

adjusting a backlight brightness of the LCD in accordance with the average brightness of the display images of each of the sub-display areas, such that the backlight brightness of the LCD within each of image display periods is compatible with the average brightness of the displayed images of each of the sub-display areas.