US 2025/0098050 A1Published application

Cascade led driving data transmission method and led driving circuit

AssigneeShenzhen Sunmoon Microelectronics Co., Ltd.

InventorKeyong Chen

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Abstract

A cascade LED driving data transmission method is provided, comprising: determining validity of a first input data from the first input port and a second input data from the second input port, wherein when the second input data is valid, it is selected as an input data, and when the second input data is invalid and the first input data is valid, the first input data is selected as the input data; sampling control data and extracting driving data from the input data and shaping the remaining data and outputting it as an output data to the output port; and driving a corresponding LED using the control data and the driving data. The method uses a signal for transmitting data from an additional chip as a main input, effectively solving the problem of losing data in a frame when there is no signal and achieving real-time detection and switching.

Claims8

Dependent claims

A cascade LED driving data transmission method, used for a LED driving circuit comprising n cascaded LED driver chips, wherein each LED driver chip comprises a first input port, a second input port, and an output port, and one or both of the first input port and the second input port of a first LED driver chip are input with input signals, the first input port of an i-th LED driver chip is connected to the output port of an i−1th LED driver chip, and the second input port of the i-th LED driver chip is connected to the output port of an i−2th LED driver chip, wherein i is a positive integer greater than or equal to 2 and less than or equal to n, characterized in that for the i-th LED driver chip, said method comprises the following steps:

determining validity of a first input data from the first input port and a second input data from the second input port, wherein when the second input data is valid, the second input data is selected as an input data for the i-th LED driver chip, and when the second input data is invalid and the first input data is valid, the first input data is selected as the input data for the i-th LED driver chip;
sampling control data and extracting driving data for the i-th LED driver chip from the input data, and shaping the remaining data and outputting it as an output data of the i-th LED driver chip to the output port of the i-th LED driver chip;
and
driving an i-th LED using the control data and the driving data for the i-th LED driver chip.

1 more element

A LED driving circuit, comprising n cascaded LED driver chips, wherein each LED driver chip comprises a first input port, a second input port, and an output port, and one or both of the first input port and the second input port of a first LED driver chip are input with input signals, the first input port of an i-th LED driver chip is connected to the output port of an i−1th LED driver chip, and the second input port of the i-th LED driver chip is connected to the output port of an i−2th LED driver chip, wherein i is a positive integer greater than or equal to 2 and less than or equal to n, characterized in that each LED driver chip comprises:

an input detecting module being configured to determine validity of a first input data from the first input port and a second input data from the second input port, wherein when the second input data is valid, the second input data is selected as an input data, and when the second input data is invalid and the first input data is valid, the first input data is selected as the input data;
a decoding module being configured to sample control data and extract driving data for the LED driver chip from the input data;
a shaping and regeneration module being configured to shape the remaining data from the decoding module and use it as an output data of the LED driver chip;
and
a driving module being configured to drive a corresponding LED using the control data and the driving data.

2 more elements

Dependencies are inferred from the claim text.