Backlight module of display and lighting method thereof

Patent metadata

Field	Value
Publication number	US-11915662-B2
Application number	US-202218068373-A
Country	US
Kind code	B2
Filing date	Dec 19, 2022
Priority date	Jun 16, 2022
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

A backlight module includes at least one drive light-emitting group. The drive light-emitting group includes a drive unit provided with plurality of signal transmission channels, a plurality of light-emitting units and a plurality of line groups. The signal transmission channel is connected to the light-emitting unit through the line group. The signal transmission channel, the line group and the light-emitting unit are arranged in one-to-one correspondence. The line group includes a main transmission line and a compensation line arranged in parallel. The compensation lines of the plurality of line groups are connected through a control switch group. When there is an abnormal signal transmission channel, the control switch group is enabled to control a compensation line corresponding to the abnormal signal transmission channel to be conducted with compensation line corresponding to at least one normal signal transmission channel.

First claim

What is claimed is:

1. A backlight module comprising:
at least one drive light-emitting group, comprising:
a drive unit provided with a plurality of signal transmission channels;
a plurality of light-emitting units; and
a plurality of line groups, wherein each signal transmission channel is connected to one light-emitting unit through a corresponding line group, and the signal transmission channel, the line group and the light-emitting unit are arranged in one-to-one correspondence, wherein the line group comprises a main transmission line and a compensation line arranged in parallel;

wherein compensation lines of the plurality of line groups are connected through a control switch group, when one of the plurality of signal transmission channels is abnormal, the control switch group is enabled to control a compensation line corresponding to an abnormal signal transmission channel to be conducted with a compensation line corresponding to at least one normal signal transmission channel in the plurality of signal transmission channels;
wherein the control switch group comprises a plurality of first control switches, and the first control switch is connected in series with the compensation line in one-to-one correspondence, wherein a first terminal of the first control switch is connected to the signal transmission channel, a second terminal of the first control switch is connected to the light-emitting unit, a control terminal of the first control switch is turned on or off in response to a control signal and enables the first terminal of the first control switch and the second terminal of the first control switch to be turned on or off;
wherein in adjacent two compensation lines, the second terminal of the first control switch on one of the adjacent two compensation lines is connected to the first terminal of the first control switch on another one of the adjacent two compensation lines;
wherein the control switch group further comprises a plurality of second control switches and a plurality of third control switches, and each compensation line is correspondingly connected in series with one of the second control switches and one of the third control switches;
wherein on each of the compensation lines, a first terminal of the second control switch is connected to the signal transmission channel, a second terminal of the second control switch is connected to the first terminal of the first control switch, the second terminal of the first control switch is connected to a first terminal of the third control switch, and a second terminal of the third control switch is connected to the light-emitting unit; and
wherein control terminals of the first control switch, the second control switch and the third control switch are respectively configured for controlling the first terminal and the second terminal of each of the first control switch, the second control switch and the third control switch to be turned on or off in response to the corresponding control signal.

2. The backlight module according to claim 1 , wherein the backlight module further comprises a control unit configured for outputting control signals, and the control terminal of each of the first control switch, the second control switch and the third control switch is connected to the control unit.

3. The backlight module according to claim 1 , wherein in each of the drive units, N compensation lines are arranged in sequence, the second terminal of the first control switch on an n-th compensation line is connected to the first terminal of the first control switch on an (n+1)-th compensation line, wherein, 1≤n<N, N≥2, and n and N are positive integers; and
wherein at least two groups of drive light-emitting groups are provided, wherein in the at least two groups of drive light-emitting groups, the second terminal of the first control switch on an N-th compensation line of one of the at least two groups is connected to the first terminal of the first control switch on the first compensation line of another of the at least two groups.

4. The backlight module according to claim 3 , wherein the at least two groups of drive light-emitting groups are connected in sequence.

5. The backlight module according to claim 3 , wherein each of the at least two groups of drive light-emitting groups is connected to each of the remaining of the at least two groups of drive light-emitting groups.

6. The backlight module according to claim 3 , wherein the control switch group further comprises a fourth control switch, wherein a first terminal of the fourth control switch is connected to the second terminal of the first control switch on the N-th compensation line of the drive light-emitting group, and a second terminal of the fourth control switch is connected to the first terminal of the first control switch on the first compensation line of the drive light-emitting group.

7. The backlight module according to claim 1 , wherein the first control switch, the second control switch and the third control switch are MOS transistors.

8. A lighting method of a backlight module, wherein the backlight module comprises at least one drive light-emitting group, the drive light-emitting group comprising a drive unit, a plurality of light-emitting units and a plurality of line groups, wherein the drive unit is provided with a plurality of signal transmission channels, each signal transmission channel is connected to one light-emitting unit through a corresponding line group, and the signal transmission channel, the line group and the light-emitting unit are arranged in one-to-one correspondence, wherein the line group comprising a main transmission line and a compensation line arranged in parallel, and compensation lines of the plurality of line groups are connected through a control switch group;
the lighting method of the backlight module comprises:
detecting an abnormal signal transmission channel of the signal transmission channel in the drive unit; and
controlling the control switch group to allow a compensation line corresponding to the abnormal signal transmission channel to be conducted with a compensation line corresponding to at least one normal signal transmission channel in the plurality of signal transmission channels;

wherein after detecting the abnormal signal transmission channel of the signal transmission channel in the drive unit, the method further comprises:
detecting whether there is an idle signal transmission channel in the drive unit and determining an idle channel;

wherein controlling the control switch group to allow the compensation line corresponding to the abnormal signal transmission channel to be conducted with the compensation line corresponding to at least one normal signal transmission channel in the plurality of signal transmission channels comprises:
controlling the control switch group to allow the compensation line corresponding to the abnormal signal transmission channel to be conducted with a compensation line corresponding to the idle channel in the plurality of signal transmission channels.

9. The lighting method of the backlight module according to claim 8 , wherein the control switch group comprises a plurality of first control switches, a plurality of second control switches and a plurality of third control switches, wherein the first control switch, the second control switch and the third control switch are correspondingly connected in series on each of the compensation lines, wherein on each of the compensation lines: a first terminal of the second control switch is connected to the signal transmission channel, a second terminal of the second control switch is connected to the first terminal of the first control switch, a second terminal of the first control swi

Assignees

• Hkc Corp Ltd

Inventors

• Qiu Bin
• Li Rongrong

Classifications

• G09G3/342 Primary

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• Y02B20/30

  Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] · CPC title