Backlight data transmission method, micro control unit and local dimming backlight system

Patent metadata

Field	Value
Publication number	US-12039944-B2
Application number	US-202117639166-A
Country	US
Kind code	B2
Filing date	Apr 26, 2021
Priority date	Apr 26, 2021
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

The present disclosure provides a backlight data transmission method including: receiving, in response to a first vertical synchronization signal of a current image frame sent from a logic circuit board, an entire of backlight data sent from the logic circuit board during a first preset time period, where the entire backlight data includes backlight data corresponding to backlight regions, and duration of the first preset time period is longer than duration of the first vertical synchronization signal in an active level state during one period; and sending the entire backlight data to a backlight driving module during a second preset time period after the first preset time period, where a sum of the duration of the first preset time period and duration of the second preset time period is less than a period of the first vertical synchronization signal.

First claim

What is claimed is:

1. A backlight data transmission method applied to a micro control unit and comprising:
receiving, in response to a first vertical synchronization signal of a current image frame sent from a logic circuit board, an entire of backlight data sent from the logic circuit board during a first preset time period, wherein the entire of the backlight data comprises backlight data corresponding to backlight regions, and wherein duration of the first preset time period is longer than duration of the first vertical synchronization signal in an active level state in one period; and
sending the entire of the backlight data to a backlight driving module during a second preset time period after the first preset time period, wherein a sum of the duration of the first preset time period and duration of the second preset time period is less than a period of the first vertical synchronization signal,
wherein the duration T1 of the first preset time period satisfies:

A
*
n
⁢
1

+
B

f
⁢
1

*
α

≤

T
⁢
1

<

1

f
⁢
2

where n1 is a total number of the backlight regions, A is a bit number of backlight data corresponding to one of the backlight regions, B is a bit number of non-backlight data transmitted during a process of transmitting the entire of the backlight data between the logic circuit board and the micro control unit, f1 is a signal transmission frequency between the logic circuit board and the micro control unit, f2 is a backlight refresh frequency, and a is a first preset margin coefficient with 1≤α≤1.5.

2. The method according to claim 1 , wherein the backlight data is transmitted between the logic circuit board and the micro control unit based on a serial peripheral interface protocol.

3. The method according to claim 1 , wherein the bit number A of backlight data corresponding to one of the backlight regions is 16, the bit number B of non-backlight data transmitted during the process of transmitting the entire of the backlight data between the logic circuit board and the micro control unit is 32, and the preset margin coefficient α is 1.1.

4. The method according to claim 1 , wherein the backlight data is transmitted between the micro control unit and the backlight driving module based on a serial peripheral interface protocol.

5. The method according to claim 1 , wherein the duration T2 of the second preset time period satisfies:

A
*
n
⁢
2

+
C
+

N
*
D

f
⁢
3

*
β

≤

T
⁢
2

<

1

f
⁢
2

where n2 is a number of backlight regions corresponding to one communication channel through which the most backlight data is transmitted between the micro control unit and the backlight driving module, A is a bit number of backlight data corresponding to one of the backlight regions, C is a bit number of non-backlight data transmitted during a process of transmitting the entire of the backlight data between the micro control unit and the backlight driving module, N is a number of driving chips in the backlight driving module, D is a bit number for identifying one of the driving chips, f3 is a signal transmission frequency between the micro control unit and the backlight driving module, f2 is a backlight refresh frequency, and β is a second preset margin coefficient with 1≤β1.5.

6. The method according to claim 5 , wherein the bit number A of the backlight data corresponding to one of the backlight regions is 16, the bit number C of the non-backlight data transmitted during the process of transmitting the entire of the backlight data between and the micro control unit and the backlight driving module is 24, the bit number D for identifying one of the driving chips is 8, and the second preset margin coefficient β is 1.1.

7. The method according to claim 1 , wherein
the total number of the backlight regions is 72; and
two communication channels are provided between the micro control unit and the backlight driving module, one of the two communication channels is configured to transmit backlight data corresponding to fourth backlight regions of the seventy-two backlight regions, and the other of the two communication channels is configured to transmit backlight data corresponding to the remaining thirty-two backlight regions of the seventy-two backlight regions.

8. The method according to claim 1 , wherein when the first vertical synchronization signal received from the logic circuit board is switched from an inactive level state to an active level state, the micro control unit starts receiving the backlight data from the logic circuit board.

9. The method according to claim 1 , wherein the duration T1 of the first preset time period and the duration T2 of the first preset time period satisfy:

T
⁢
1

+

T
⁢
2

≤

1

f
⁢
2

where f2 is a backlight refresh frequency.

10. The method according to claim 1 , wherein the duration T1 of the first preset time period and the duration T2 of the first preset time period satisfy:

1
2

≤

T
⁢
1

T
⁢
2

≤

2
.

11. The method according to claim 1 , wherein before receiving, in response to the first vertical synch

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• Li Shou
• Yan hengyu
• Li Wenyu
• Meng Zhiming
• Zhang Jian
• Bu Zhanchang

Classifications

• G09G2370/00

  Aspects of data communication · CPC title

• G09G2370/10

  Use of a protocol of communication by packets in interfaces along the display data pipeline · CPC title

• G09G3/34

  by control of light from an independent source · CPC title

• 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

• G09G3/2096 Primary

  Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167) · CPC title