LIQUID CRYSTAL DISPLAY DEVICE AS WELL AS BACKLIGHT SOURCE AND DIMMING METHOD FOR THE SAME

• US 20150179111A1
• Filed: 01/17/2014
• Published: 06/25/2015
• Est. Priority Date: 12/25/2013
• Status: Abandoned Application

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Chen, Xinhong
• Application Number:
  US14/240,366
• Publication Number:
  US 20150179111A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• 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

Abstract

The present disclosure relates to a liquid crystal display device, a backlight source, and a dimming method for the liquid crystal display device. The backlight source for a liquid crystal display device comprises: a backlight lamp group which is divided into at least two areas, each being provided with a group of multi-color LED light sources distributed therein, and the individual areas formed by dividing the backlight lamp group being in one-to-one correspondence with individual display picture regions formed by dividing a liquid crystal display panel; a time sequence control circuit, which generates time sequence signals for individual LEDs of a group of multi-color LED light sources in the backlight lamp group area associated with a respective region; and an LED driving circuit, which controls the brightness of individual LEDs of the multi-color LED light sources in respective areas, so as to adjust the hue among the areas and the brightness of the current area. Therefore, through dividing the backlight source so as to be in correspondence with different display picture regions of the liquid crystal display panel, and controlling the brightness of the LEDs with various colors of the multi-color LED light sources in different areas based on the display contents in the different display picture regions, the hue among the areas can be changed, and the expression of LCD pictures can be improved.

Claims

1. A backlight source for a liquid crystal display device, comprising:

a backlight lamp group, which is divided into at least two areas, each being provided with a group of multi-color LED light sources distributed therein, and the individual areas formed by dividing the backlight lamp group being in one-to-one correspondence with individual display picture regions formed by dividing a liquid crystal display panel of the liquid crystal display device;

a time sequence control circuit, which, based on the hue and brightness information of an image that should be displayed currently in the image data analyzed by different display picture regions of the liquid crystal display panel, generates time sequence signals for individual LEDs of a group of multi-color LED light sources in the backlight lamp group area associated with a respective region; and

an LED driving circuit, which is electrically connected between the time sequence control circuit and the backlight lamp group, and, based on the received time sequence signals for individual LEDs associated with different backlight lamp group areas respectively, controls the brightness of individual LEDs of the multi-color LED light sources in respective areas, so as to adjust the hue among the areas and the brightness of the current area.

2. The backlight source according to claim 1, wherein, when the backlight source is a side-light type backlight source, each multi-color LED light source includes a plurality of groups of LED lamp bars formed by providing red LEDs, green LEDs, blue LEDs and white LEDs distributed with a set sequence, each of the white LEDs being used for performing brightness compensation on the area where it is located.

3. The backlight source according to claim 1, wherein, when the backlight source is a direct type backlight source, each multi-color LED light source includes at least one group of annular lamp bead units fixated by providing red LEDs, green LEDs, blue LEDs and white LEDs distributed with a set sequence, each white LEDs being used for performing brightness compensation on the area where it is located.

4. The backlight source according to claim 1, wherein the time sequence control circuit comprises:

an image data obtaining device, used for obtaining image data of the liquid crystal display panel;

an image data partition calculating device, used for processing the image data obtained by the image data obtaining device, and, based on the pixel position of each image data in the current region of the liquid crystal display panel, calculating the average hue and brightness information in the current region; and

an LED time sequence signal generating module, used for, based on the average hue and brightness information in each region, generating time sequence signals for individual LEDs of a group of multi-color LED light sources in the backlight lamp group area associated with a respective region.

5. The backlight source according to claim 2, wherein the time sequence control circuit comprises:

an image data obtaining device, used for obtaining image data of the liquid crystal display panel;

an image data partition calculating device, used for processing the image data obtained by the image data obtaining device, and, based on the pixel position of each image data in the current region of the liquid crystal display panel, calculating the average hue and brightness information in the current region; and

an LED time sequence signal generating module, used for, based on the average hue and brightness information in each region, generating time sequence signals for individual LEDs of a group of multi-color LED light sources in the backlight lamp group area associated with a respective region.

6. The backlight source according to claim 3, wherein the time sequence control circuit comprises:

an image data obtaining device, used for obtaining image data of the liquid crystal display panel;

an image data partition calculating device, used for processing the image data obtained by the image data obtaining device, and, based on the pixel position of each image data in the current region of the liquid crystal display panel, calculating the average hue and brightness information in the current region; and

an LED time sequence signal generating module, used for, based on the average hue and brightness information in each region, generating time sequence signals for individual LEDs of a group of multi-color LED light sources in the backlight lamp group area associated with a respective region.

7. A liquid crystal display device, comprising:

a liquid crystal display panel, which performs image display based on image data obtained, and is divided into a plurality of display picture regions; and

a backlight source, comprising;

a backlight lamp group which is divided into at least two areas, each being provided with a group of multi-color LED light sources distributed therein, and the individual areas formed by dividing the backlight lamp group being in one-to-one correspondence with individual display picture regions formed by dividing a liquid crystal display panel;

a time sequence control circuit, which, based on the hue and brightness information of an image that should be displayed currently in the image data analyzed by different display picture regions of the liquid crystal display panel, generates time sequence signals for individual LEDs of a group of multi-color LED light sources in the backlight lamp group area associated with a respective region; and

an LED driving circuit, which is electrically connected between the time sequence control circuit and the backlight lamp group, and, based on the received time sequence signals for individual LEDs associated with different backlight lamp group areas respectively, controls the brightness of individual LEDs of the multi-color LED light sources in respective areas, so as to adjust the hue among the areas and the brightness of the current area.

8. The liquid crystal display device according to claim 7, wherein the time sequence control circuit comprises:

an image data obtaining device, used for obtaining image data of the liquid crystal display panel;

an image data partition calculating device, used for processing the image data obtained by the image data obtaining device, and, based on the pixel position of each image data in the current region of the liquid crystal display panel, calculating the average hue and brightness information in the current region; and

an LED time sequence signal generating module, used for, based on the average hue and brightness information in each region, generating time sequence signals for individual LEDs of a group of multi-color LED light sources in the backlight lamp group area associated with a respective region.

9. The liquid crystal display device according to claim 7, wherein the multi-color LED light source is one formed by providing multi-color LEDs, including white LEDs, distributed with a set sequence, wherein each white LED is used for performing brightness compensation on the area where it is located;

and

the time sequence control circuit, based on the hue and brightness information of an image needing to be displayed currently in the image data analyzed by different display picture regions of the liquid crystal display panel, generates time sequence signals for individual LEDs other than white LEDS in each backlight lamp group area associated with a respective region, so as to perform hue matching on pictures in the corresponding areas, and generates time sequence signals of the white LEDs so as to perform brightness supplement.

10. The liquid crystal display device according to claim 8, wherein the multi-color LED light source is one formed by providing multi-color LEDs, including white LEDs, distributed with a set sequence, wherein each white LED is used for performing brightness compensation on the area where it is located;

and

the time sequence control circuit, based on the hue and brightness information of an image needing to be displayed currently in the image data analyzed by different display picture regions of the liquid crystal display panel, generates time sequence signals for individual LEDs other than white LEDS in each backlight lamp group area associated with a respective region, so as to perform hue matching on pictures in the corresponding areas, and generates time sequence signals of the white LEDs so as to perform brightness supplement.

11. The liquid crystal display device according to claim 7, when the backlight source is a direct type backlight source, each multi-color LED light source includes at least one group of annular lamp bead units formed by distributing red LEDs, green LEDs, blue LEDs and white LEDs according to a set sequence, wherein each white LEDs is used for performing brightness compensation on the area where it is located.

12. A dimming method for a liquid crystal display device, comprising steps of:

dividing a backlight lamp group of a backlight source into at least two areas, each being provided with multi-color LED light sources distributed therein, and the individual areas formed by dividing the backlight lamp group being in one-to-one correspondence with individual display picture regions formed by dividing a liquid crystal display panel;

obtaining image data, through a time sequence control circuit, from the liquid crystal display panel, and, based on the hue and brightness information of an image needing to be displayed currently in the analyzed by different display picture regions of the liquid crystal display panel, generates time sequence signals for individual LEDs of a group of multi-color LED light sources in each backlight lamp group area associated with a respective region; and

based on the received time sequence signals for individual LEDs associated with different backlight lamp group areas respectively, controlling, through an LED driving circuit, the brightness of individual LEDs of the multi-color LED light sources in respective areas, so as to adjust the hue of the areas and the brightness of the current area.

13. The dimming method according to claim 12, wherein the multi-color LED light source is one formed by providing multi-color LEDs, including white LEDs, distributed with a set sequence, wherein each white LED is used for performing brightness compensation on the area where it is located;

and

the time sequence control circuit, based on the hue and brightness information of an image needing to be displayed currently in the image data analyzed by different display picture regions of the liquid crystal display panel, generates time sequence signals for individual LEDs other than white LEDS in each backlight lamp group area associated with a respective region, so as to perform hue matching on pictures in the corresponding areas, and generates time sequence signals of the white LEDs so as to perform brightness supplement.