Light source driving circuit and communication device for display system

Patent metadata

Field	Value
Publication number	US-12087243-B2
Application number	US-202218086518-A
Country	US
Kind code	B2
Filing date	Dec 21, 2022
Priority date	Dec 21, 2021
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A light source driving circuit and a communication device for a display system are provided. The communication device includes a control unit and at least one string light source driving circuit. The control unit includes an output interface for transmitting the control commands or data and a reading back data input interface. Each string light source driving circuit includes a plurality of light source driving circuits. The control unit transmits the control commands or data to the first light source driving circuit of each string light source driving circuit through the output interface. The first driving circuit takes out the commands or data required at the current stage after receiving the control command or data, and then repackages the commands or data of the remaining driving circuits, and transmits the repackaged data packet through the serial output interface and the parallel interfaces or the parallel interfaces.

First claim

What is claimed is:

1. A communication device for a display system, comprising:
a control unit, comprising an output interface for transmitting control commands or data and a reading back data input interface, the control commands comprising at least one of a configuration data packet, a brightness data packet, a detection packet, address data, and a device address storage data packet; and
at least one string light source driving circuit, each string light source driving circuit of the at least one string light source driving circuit comprising a plurality of light source driving circuits, and each light source driving circuit of the plurality of light source driving circuits comprises a serial input interface, a serial output interface, parallel interfaces, and at least one current output interface, the current output interface comprising at least two current output channels, each of the at least two current output channels being independently connected to a cathode of a respective light-emitting unit mini-LED array, the at least two current output channels being separate from the parallel interfaces and the serial interfaces,
wherein the control unit transmits the control commands or data to a first light source driving circuit of the each string light source driving circuit through the output interface of the control unit, the first light source driving circuit takes out commands or data required by a current stage after receiving the control commands or data, then repackages commands or data of remaining driving circuits to obtain a repackaged data packet, and transmits the repackaged data packet through the serial output interface and the parallel interfaces or the parallel interfaces, and
wherein the control unit is only connected to the first light source driving circuit by a serial input interface of the first light source driving circuit and each light source driving circuit of the plurality of light source driving circuits is connected to each other by the parallel interfaces.

2. The communication device for the display system of claim 1 , wherein,
second and subsequent stages of light source driving circuits of each string light source driving circuit receive the commands or data through the serial input interface and the parallel interfaces, take out the commands or data required at the current stage, then repackage the commands or data of the remaining driving circuits, and transmit the repackaged data packet through the serial output interface and the parallel interfaces or the parallel interfaces,
wherein the first light source driving circuit of the at least one string light source driving circuit is configured to only receive configuration data packets from the control unit via the serial input interface, and
wherein each subsequent light source driving circuit is configured to receive configuration data packets via the serial input interface and a parallel interface of the parallel interfaces.

3. The communication device for the display system of claim 2 , wherein the control command comprises a reading back command, and the control unit transmits the reading back command to the first light source driving circuit of each string light source driving circuit through the output interface,
the first light source driving circuit, according to the device address of the data that needs to be returned in the reading back command, determines whether to transmit the reading back command through the serial output interface and the parallel interfaces or the parallel interfaces,
the second and the subsequent stages of the light source driving circuits of each string light source driving circuit, according to the device address of the data that need to be returned in the received reading back command, determine whether to transmit the reading back command through the serial output interface and the parallel interfaces or the parallel interfaces.

4. The communication device for the display system of claim 3 , wherein,
each light source driving circuit, according to whether the address of a current stage device is consistent with the address of the data that needs to be returned in the reading back command, determines whether to return the reading back data of the current stage to the control unit,
the plurality of light source driving circuits transmit status data to be read back to a last light source driving circuit through a data communication line formed of a serial input interface and a serial output interface of the light source driving circuit and the parallel interfaces of the light source driving circuit, or a data communication line formed of the parallel interfaces of the light source driving circuit,
the last light source driving circuit returns the reading back data of all light source driving circuits to the reading back data input interface of the control unit.

5. The communication device for the display system of claim 1 , wherein,
the first light source driving circuit intercepts data of the corresponding address from at least one of the configuration data packet, the brightness data packet, and the detection data packet as the data of the current stage according to the address data of the current stage.

6. The communication device for the display system of claim 1 , wherein,
the control unit transmits and assigns the address data through a data communication line formed of the serial input interface and the serial output interface of the plurality of the light source driving circuits.

7. The communication device for the display system of claim 6 , wherein,
the control unit transmits a device address storage command to each light source driving circuit through the output interface, and each light source driving circuit burns the assigned address data to a storage device of the each light source driving circuit.

8. The communication device for the display system of claim 1 , wherein,
a first driving circuit serial input interface in each string light source driving circuit is coupled to the output interface of the control unit, serial input interfaces of the remaining each driving circuit are coupled to the serial output interface of a previous driving circuit, and the parallel interfaces of the remaining each driving circuit are coupled to the parallel interface of a first driving circuit,
last driving circuit serial output interfaces of each string light source driving circuit are connected to the reading back data input interface of the control unit.

9. The communication device for the display system of claim 1 , wherein the control unit transmits a first detection command to the first driving circuit through the output interface, and the first driving circuit forwards the first detection command to the parallel interfaces of the current stage, or pulls down signals of the parallel interface for a period of time,
each remaining driving circuit receives the first detection command through the parallel interface of the current stage or pulls down the signals of the parallel interface for a period of time,
all driving circuits in each line call out configuration parameters corresponding to the first detection command, and light LED lights electrically connected to the current output interface of the driving circuits to detect the circuits.

10. The communication device for the display system of claim 9 , wherein,
the control unit transmits a second detection command to the first driving circuit through the output interface, and the first driving circuit forwards the second detection command to the serial output interface of the current stage,
each remaining driving circuit receives the second detection command through the serial input interface of the current stage,
all driving c

Assignees

• Joulwatt Tech Co Ltd

Inventors

• Wong Pitleong
• Li Duo

Classifications

• G09G3/36

  using liquid crystals · CPC title

• G09G2330/026

  Arrangements or methods related to booting a display · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G3/3685

  Details of drivers for data electrodes · CPC title

• G09G3/2096

  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