Backlight Driving Device With Bidirectional Data Routing
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Solution Overview
Problem
Backlight display devices with cascaded drivers for LEDs face significant degradation in display quality when abnormalities occur, as all drivers downstream from an affected driver become unable to function, leading to incomplete light emission and reduced image quality.
Innovation Solution
A backlight driving device configuration where drivers are cascaded and equipped with bi-directional data transfer capabilities, allowing drive data to be routed from one end of the cascade to the other even if intermediate drivers are faulty, ensuring maximum LED illumination and minimizing display quality deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If drivers are cascaded in a daisy-chain configuration, then device complexity is reduced and ease of manufacture is improved, but reliability deteriorates because an abnormality in one driver causes all downstream drivers to fail
Solution Approach 1:
The system dynamically switches between unidirectional and bidirectional data transfer modes based on the operational status of drivers. When a driver abnormality is detected, the control unit changes the data transfer direction to bypass the faulty driver, allowing the system to adapt its configuration in real-time to maintain reliability while preserving the simple cascaded structure
Solution Approach 2:
The patent changes the operational parameter of data transfer direction (from fixed unidirectional to variable bidirectional) in response to driver status. By modifying the direction parameter based on detected abnormalities, the system maintains reliability without altering the physical cascaded structure, thus preserving ease of manufacture
2Reliability
If bidirectional data transfer is implemented to bypass faulty drivers, then reliability is improved, but device complexity increases due to additional control logic
Solution Approach 1:
The control unit continuously monitors driver operation status and uses this feedback to determine when and how to switch data transfer directions. This feedback mechanism enables automatic adaptation to failures without requiring complex manual intervention or sophisticated error correction algorithms, thereby improving reliability with minimal increase in device complexity
Solution Approach 2:
The system performs self-diagnosis and self-correction by automatically detecting driver abnormalities and reconfiguring data flow paths without external intervention. This self-service capability improves reliability while avoiding the need for complex external control systems or manual reconfiguration procedures
3Ease of operation
If drive data is provided to all drivers sequentially from one end, then ease of operation is simplified, but productivity decreases when drivers have abnormalities because downstream drivers cannot receive data
Solution Approach 1:
The data transfer system dynamically adjusts its operation mode based on driver status. In normal conditions, it operates in simple sequential mode for ease of operation. When abnormalities are detected, it switches to bidirectional transfer mode to maintain productivity, with the control unit automatically managing the transition without user intervention
Data Source
AI summary
A backlight driving device includes a plurality of drivers configured to drive a plurality of light-emitting elements arranged in a planar shape in a predetermined drive unit, and a control unit configured to output drive data directed to each of the plurality of drivers. The plurality of drivers are cascaded, each of the plurality of drivers bi-directionally performs an operation of, in a case of receiving the drive data directed to another driver input from a previous stage, outputting the drive data to a subsequent stage in a row of the plurality of drivers cascaded. In a case that at least one of the plurality of drivers has an abnormality, the control unit outputs the drive data to the driver located at one end of the plurality of drivers, and then outputs the drive data to the driver located at the other end of the plurality of drivers.