Backlight system

Patent metadata

Field	Value
Publication number	US-12092923-B2
Application number	US-202217940619-A
Country	US
Kind code	B2
Filing date	Sep 8, 2022
Priority date	Dec 23, 2021
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A backlight system includes a plurality of pixel ICs respectively including a plurality of channels connected to a plurality of LEDs and that control the LEDs to be turned on and off through the channels, and a driver IC connected to the pixel ICs and that supplies a data signal to each of the pixel ICs. The pixel ICs include a first pixel IC connected to first LEDs and a second pixel IC connected to second LEDs. The first pixel IC turns the first LEDs on or off in a first order based on first control data included in the data signal, and the second pixel IC turns the second LEDs on or off in a second order different from the first order based on second control data included in the data signal.

First claim

What is claimed is:

1. A backlight system, comprising:
a plurality of pixel ICs including a plurality of channels, wherein the plurality of channels are connected to a plurality of LEDs, and wherein the plurality of pixel ICs are configured to control the plurality of LEDs to be turned on and off through the plurality of channels; and
a driver IC connected to the plurality of pixel ICs and configured to supply a data signal to each of the plurality of pixel ICs,
wherein the data signal comprises first control data that specifies a first order of turning on or off a plurality of first LEDs from among the plurality of LEDs and second control data that specifies a second order of turning on or off a plurality of second LEDs from among the plurality of LEDs, the first order being different from the second order,
wherein the plurality of pixel ICs include a first pixel IC connected to the plurality of first LEDs and a second pixel IC connected to the plurality of second LEDs,
wherein the first pixel IC is configured to turn the plurality of first LEDs on or off according to the first order, and the second pixel IC is configured to turn the plurality of second LEDs on or off according to the second order, and
wherein an amount of control data in the data signals received by the plurality of pixel ICs is different from each other.

2. The backlight system of claim 1 ,
wherein each of the first pixel IC and the second pixel IC includes first to Nth channels from among the plurality of channels, where N is a natural number equal to or greater than 2, and
wherein the first pixel IC turns on the plurality of first LEDs connected to first to Nth channels of the first pixel IC in order, and the second pixel IC turns on the plurality of second LEDs connected to first to Nth channels of the second pixel IC in a reverse order.

3. The backlight system of claim 1 ,
wherein the data signal includes identification information and control data for each of the plurality of pixel ICs, and
wherein at least a portion of the plurality of pixel ICs select one piece of the control data from the data signal based on the identification information and output remaining pieces of control data from the data signal to another pixel IC of the plurality of pixel ICs.

4. The backlight system of claim 1 ,
wherein the data signal includes control data for each of the plurality of pixel ICs, and
wherein each of the plurality of pixel ICs selects one piece of the control data from the data signal based on an order of receiving the data signal, and outputs remaining pieces of control data from the data signal to another pixel IC of the plurality of pixel ICs.

5. The backlight system of claim 1 , wherein, in at least one of the plurality of pixel ICs, a first number of LEDs from among the plurality of LEDs are connected to a first channel among the plurality of channels, and a second number of LEDs from among the plurality of LEDs are connected to a second channel among the plurality of channels, and
the second number of LEDs is different from the first number of LEDs.

6. The backlight system of claim 1 , wherein a different one of the plurality of LEDs is connected to each of the plurality of channels.

7. The backlight system of claim 1 ,
wherein the driver IC includes a power circuit configured to output a power supply voltage for the plurality of pixel ICs, a converter circuit configured to supply a driving voltage to the plurality of LEDs, and a data circuit configured to output the data signal, and
wherein each of the plurality of pixel ICs includes at least one switch element connected to an output terminal, and a controller configured to control the at least one switch element to be turned on and off in response to control data included in the data signal, the output terminal connected to at least one LED from among the plurality of LEDs.

8. The backlight system of claim 7 , wherein the controller outputs a control signal to a control terminal of the at least one switch element, and adjusts a duty ratio of the control signal with reference to the control data.

9. The backlight system of claim 1 ,
wherein each of the first pixel IC and the second pixel IC includes first to Nth channels from among the plurality of channels, where N is a natural number equal to or greater than 2,
wherein the first pixel IC turns on a portion of first LEDs among the plurality of first LEDs connected to first to Mth channels of the first pixel IC, and thereafter turns on remaining first LEDs among the plurality of first LEDs connected to M+1th to Nth channels of the first pixel IC of the first pixel IC, and
wherein the second pixel IC turns on a portion of second LEDs among the plurality of second LEDs connected to M+1th to Nth channels of the second pixel IC, and thereafter turns on remaining second LEDs connected to first to Mth channels of the second pixel IC.

10. The backlight system of claim 9 , wherein N is a multiple of 2, and M is N/2.

11. The backlight system of claim 9 , wherein the first pixel IC is disposed between the portion of first LEDs and the remaining first LEDs, and the second pixel IC is disposed between the portion of second LEDs and the remaining second LEDs.

12. A backlight system, comprising:
a circuit board;
a driver IC configured to output a data signal including a plurality of pieces of control data; and
a plurality of pixel ICs configured to control, based upon the data signal, a plurality of LEDs to be turned on and off, the plurality of pixel ICs connected to each other in series on the circuit board,
wherein an amount of control data in the data signals received by the plurality of pixel ICs is different from each other,
wherein the data signal comprises first control data that specifies a first order of turning on or off a plurality of first LEDs from among the plurality of LEDs and second control data that specifies a second order of turning on or off a plurality of second LEDs from among the plurality of LEDs, the first order being different from the second order,
wherein a first pixel IC among the plurality of pixel ICs is configured to turn the plurality of first LEDs on or off according to the first order, and a second pixel IC among the plurality of pixel ICs is configured to turn the plurality of second LEDs on or off according to the second order,
wherein the plurality of pixel ICs include a lead pixel IC directly connected to the driver IC, a plurality of intermediate pixel ICs connected to the lead pixel IC, and a last pixel IC connected to the plurality of intermediate pixel ICs,
wherein each of the plurality of intermediate pixel ICs is connected between a first neighboring pixel IC and a second neighboring pixel IC, receives the data signal from the first neighboring pixel IC, and outputs the data signal to the second neighboring pixel IC, and
wherein at least one of the plurality of intermediate pixel ICs is adjacent to the first neighboring pixel IC in a first direction and is adjacent to the second neighboring pixel IC in a second direction intersecting the first direction.

13. The backlight system of claim 12 , wherein the plurality of LEDs and the plurality of pixel ICs are mounted on a first surface of the circuit board, and the driver IC is mounted on a second surface of the circuit board.

14. The backlight system of claim 12 , wherein the circuit board, the plurality of LEDs, the plurality of pixel ICs, and the driver IC are disposed as an LED plate, and
wherein the backlight system includes a plurality of LED plates disposed adjacent to each other in a direction parallel to an upper surface of the circuit boar

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kang Sugyeung
• Kim Kangjoo
• Kwon Taehyeon
• Kim Sunkwon
• Ahn Sewoong
• Lee Sungmok
• Lee Yilho
• Lee Jongsung
• Cho Changyeon

Classifications

• G02F1/133612

  Electrical details · CPC title

• G09G2320/062

  Adjustment of illumination source parameters · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G3/32

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• G02F1/133601

  for spatial active dimming · CPC title