Liquid crystal display device

• US 10,621,926 B2
• Filed: 12/16/2017
• Issued: 04/14/2020
• Est. Priority Date: 12/27/2016
• Status: Active Grant

• Current Assignee: Chongqing HKC Optoelectronics Technology Co., Ltd. (Shenzhen Huike Investment Holding Co., Ltd.), HKC Corporation Limited (Shenzhen Huike Investment Holding Co., Ltd.)
• Original Assignee: HKC Corporation Limited (Shenzhen Huike Investment Holding Co., Ltd.)
• Inventors: Chen, Yu-Jen
• Primary Examiner(s): Shankar, Vijay
• Application Number:
  US16/087,525
• Publication Number:
  US 20190114978A1
• Time in Patent Office: 850 Days
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/133601 for spatial active dimming
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• 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 3/3648 : using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3666 : with the matrix divided into sections

Abstract

The disclosure relates to a liquid crystal display device. The liquid crystal display device includes a drive component, connected to the display component and configured to display each picture with two frame images in sequence; the two frame images include a first frame image and a second frame image; drive voltages of adjacent two sub-pixels on each frame image include a high drive voltage and a low drive voltage, and the drive voltages of each sub-pixel in the first frame image and in the second frame image include a high drive voltage and a low drive voltage; and a backlight control component, connected to the drive component; wherein the backlight control component is configured to determine a backlight brightness adjusting signal of each backlight subarea according to the drive voltages of a first frame image region and a second frame image region corresponding to each backlight subarea.

Claims

1. A liquid crystal display device, comprising a backlight module having backlight component divided into a plurality of backlight sub-areas, wherein the liquid crystal display device further comprises

a display panel having a display component, wherein pixels on the display panel are divided into a plurality of pixel groups, each pixel group comprises a first pixel group and a second pixel group adjacent to each other, and each of the first pixel group and the second pixel group comprises a first sub-pixel, a second sub-pixel and a third sub-pixel;

a control component, configured to look up a table to acquire a first voltage signal and a second voltage signal unequal to each other and corresponding to each sub-pixel according to a picture input signal, and enabling a front viewing angle mixing brightness of the sub-pixel alternately driven by the first voltage signal and the second voltage signal to be equivalent to a front viewing angle brightness of the sub-pixel driven by the picture input signal, wherein the picture input signal comprises a first picture and a second picture in adjacent timing sequence;

a drive component, connected to the display component and the control component respectively, and configured to display each picture with two frame images in sequence;

the drive component and the display component are integrated on the display panel;

the two frame images comprise a first frame image and a second frame image;

drive voltages of adjacent two sub-pixels on each frame image comprise a high drive voltage and a low drive voltage, and the drive voltages of each sub-pixel in the first frame image and in the second frame image comprise a high drive voltage and a low drive voltage;

wherein the drive component is further configured to enable the first voltage signal and the second voltage signal of the first sub-pixel of the first pixel group of the first picture to drive the first sub-pixel of the first pixel group and the second pixel group of the first picture respectively;

further configured to enable the second voltage signal and the first voltage signal of the second sub-pixel of the second pixel group of the first picture to drive the second sub-pixel of the first pixel group and the second pixel group of the first picture respectively;

further configured to enable the second voltage signal and the first voltage signal of the first sub-pixel of the second pixel group of the second picture to drive the first sub-pixel of the first pixel group and the second pixel group of the second picture respectively; and

further configured to enable the first voltage signal and the second voltage signal of the second sub-pixel of the first pixel group of the second picture to drive the second sub-pixel of the first pixel group and the second pixel group of the second picture respectively;

a backlight control component, connected to the drive component and configured to determine backlight brightness adjusting signals of each backlight sub-area according to the drive voltages of a first frame image area and a second frame image area corresponding to each backlight sub-area, wherein the backlight brightness adjusting signals are in groups and a group number is same as a variety number of color sub-pixels; and

a backlight adjusting component, connected to the backlight control component and the backlight component respectively, and configured to perform independent brightness adjustment on a backlight source of the sub-pixels of various colors in corresponding backlight sub-areas in respective frame images of a next picture.

2. The liquid crystal display device according to claim 1, further comprising a storage component, wherein the storage component is configured to store a lookup table;

the lookup table is a corresponding relation table of the drive voltage of each sub-pixel in the first frame image and the second frame image corresponding to an input signal and the input signal; and

the drive component acquires the drive voltage of each sub-pixel on the first frame image and the second frame image by the lookup table.

3. The liquid crystal display device according to claim 1, wherein the backlight control component comprises

a counting unit, configured to count average drive voltages of the sub-pixels of various colors in the first frame image area and the second frame image area corresponding to each backlight sub-area;

and

a calculating unit, configured to solve the backlight brightness adjustment signals according to the average drive voltages, reference backlight brightness signals and reference drive voltages of respective backlight sub-areas.

4. The liquid crystal display device according to claim 3, wherein a calculating formula for the calculating unit to solve the backlight brightness adjustment signal of the sub-pixels of each color in each backlight sub-area is as follows:

A_{M_P1}*P_{M_ave1}=A_{M_P2}*P_{M_ave2};

2*A_{M_P}*P_{M_ave}=A_{M_P1}*P_{M_ave1}+A_{M_P2}*P_{M_ave2};

wherein P represents a target color sub-pixel;

M represents a serial number of the backlight sub-area;

A_{M_P1} represents the backlight brightness adjustment signal for performing backlight brightness adjustment on a backlight source of P sub-pixels in the backlight sub-area M corresponding to the first frame image of the next picture;

A_{M_P2} represents the backlight brightness adjustment signal for performing backlight brightness adjustment on a backlight source of the P sub-pixels in the backlight sub-area M corresponding to the second frame image of the next picture;

P_{M_ave1} represents an average value of the drive voltages of the P sub-pixels in the backlight sub-area M corresponding to the first frame image of the current picture;

P_{M_ave2} represents an average value of the drive voltages of the P sub-pixels in the backlight sub-area M corresponding to the second frame image of the current picture;

A_{M_P} represents the reference backlight brightness signal of the P sub-pixels in the backlight sub-area M corresponding to the image of the current picture; and

P_{M_ave} represents the average value of reference drive voltages of the P sub-pixels in the frame image area corresponding to the backlight sub-area M on the image of the current picture.

5. The liquid crystal display device according to claim 1, further comprising a backlight module, wherein the backlight component, the backlight control component and the backlight adjusting component are integrated on the backlight module.

6. The liquid crystal display device according to claim 1, wherein the backlight source is a white light backlight source, an RGB backlight source, an RGBW backlight source or RGBY backlight source.

7. The liquid crystal display device according to claim 3, wherein the backlight source is a white light backlight source, an RGB backlight source, an RGBW backlight source or RGBY backlight source.

8. The liquid crystal display device according to claim 5, wherein the backlight source is a white light backlight source, an RGB backlight source, an RGBW backlight source or RGBY backlight source.

9. The liquid crystal display device according to claim 1, further comprising a display panel, wherein the display component and the drive component are integrated on the display panel.

10. The liquid crystal display device according to claim 1, wherein the drive component further comprises a timing controller.

11. The liquid crystal display device according to claim 1, wherein the first sub-pixel is a red sub-pixel, and the second sub-pixel is a green sub-pixel.

12. The liquid crystal display device according to claim 11, wherein the third sub-pixel is a blue sub-pixel, and the drive component is further configured to enable the first voltage signal and the second voltage signal of the blue sub-pixel of the first pixel group of the first picture to drive the blue sub-pixel of the first pixel group and the second pixel group of the first picture respectively;

and further configured to enable the second voltage signal and the first voltage signal of the blue sub-pixel of the second pixel group of the second picture to drive the blue sub-pixel of the first pixel group and the second pixel group of the second picture respectively.

13. The liquid crystal display device according to claim 11, wherein the third sub-pixel is a blue sub-pixel, and the drive component is further configured to enable the second voltage signal and the first voltage signal of the blue sub-pixel of the second pixel group of the first picture to drive the blue sub-pixel of the first pixel group and the second pixel group of the first picture respectively;

and further configured to enable the first voltage signal and the second voltage signal of the blue sub-pixel of the first pixel group of the second picture to drive the blue sub-pixel of the first pixel group and the second pixel group of the second picture respectively.

14. The liquid crystal display device according to claim 11, wherein the third sub-pixel is the blue sub-pixel, and the blue sub-pixel is driven by an original picture input signal.

15. The liquid crystal display device according to claim 1, wherein the first pixel group and the second pixel group are in a same column and disposed adjacently, and the first pixel group in one pair of pixel groups in adjacent two pairs of pixel groups is adjacent to the second pixel group of the other pair of pixel groups.

16. The liquid crystal display device according to claim 1, wherein the first pixel group and the second pixel group are in a same row and disposed adjacently, and the first pixel group in one pair of pixel groups in adjacent two pairs of pixel groups is adjacent to the second pixel group of the other pair of pixel groups.

17. The liquid crystal display device according to claim 1, wherein the display panel is a twisted nematic liquid crystal display panel, an optically compensated birefringence liquid crystal display panel or vertical alignment liquid crystal display panel.

18. The liquid crystal display device according to claim 1, wherein the display panel is an RGB three-primary color panel, an RGBW four-color panel and an RGBY four-color panel.

19. A liquid crystal display device, comprising a display component and a backlight component divided into a plurality of backlight sub-areas, wherein the liquid crystal display device further comprises

a drive component, connected to the display component, and configured to display each picture with two frame images in sequence;

the two frame images comprise a first frame image and a second frame image;

drive voltages of adjacent two sub-pixels on each frame image comprise a high drive voltage and a low drive voltage, and the drive voltages of each sub-pixel in the first frame image and in the second frame image comprise a high drive voltage and a low drive voltage;

a backlight control component, connected to the drive component and configured to determine backlight brightness adjusting signals of each backlight sub-area according to the drive voltages of a first frame image area and a second frame image area corresponding to each backlight sub-area, wherein the backlight brightness adjusting signals are in groups and a group number is same as a variety number of color sub-pixels;

wherein the backlight control component comprises

a counting unit, configured to count average drive voltages of the sub-pixels of various colors in the first frame image area and the second frame image area corresponding to each backlight sub-area; and

a calculating unit, configured to solve the backlight brightness adjustment signals according to the average drive voltages, reference backlight brightness signals and reference drive voltages of respective backlight sub-areas;

a backlight adjusting component, connected to the backlight control component and the backlight component respectively, and configured to perform independent brightness adjustment on a backlight source of the sub-pixels of various colors in corresponding backlight sub-areas in respective frame images of a next picture; and

a backlight module, wherein the backlight component, the backlight control component and the backlight adjusting component are integrated on the backlight module.

20. The liquid crystal display device according to claim 19, wherein the backlight brightness adjusting signals comprise a red sub-pixel backlight brightness adjusting signal group, a green sub-pixel backlight brightness adjusting signal group and a blue sub-pixel backlight brightness adjusting signal group, to perform independent backlight brightness adjustment control on the sub-pixels of various colors in respective backlight subareas.