LCD Driving Circuit Flexible Connector Reliability Detection
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Solution Overview
Problem
Large-size and high-resolution liquid crystal display (LCD) televisions face issues with solder skip on terminals in the middle region of connectors, leading to misalignment and potential burnout of display panels and driver chips due to the increasing size and number of terminals, as well as the difficulty in connecting flexible flat cables.
Innovation Solution
A driving circuit with a printed circuit board that includes a timing controller for providing a detection signal to a flexible connector to test connection reliability and a power chip for detecting the returned signal to control power output, ensuring reliable connection and preventing abnormal displays and panel burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the connector size and number of terminals are increased to support large-size and high-resolution LCD televisions, then the display resolution and size are improved, but the solder skip problem on terminals in the middle region occurs and connection reliability deteriorates
Solution Approach 1:
The patent implements a detection signal transmission mechanism that performs connection reliability testing before the display panel is damaged. The timing controller sends detection signals through the flexible connector to the power chip, and the power chip returns detection results to determine whether to output power. This preliminary detection action identifies solder skip problems before they cause panel burnout, resolving the contradiction by enabling early fault detection in high-terminal-count connectors.
Solution Approach 2:
The patent establishes a feedback loop where the power chip detects the returned detection signal from the flexible connector and provides feedback about connection reliability. Based on this feedback, the power chip controls whether to output power to the display panel. This feedback mechanism ensures that connection issues in large-size connectors are detected and addressed before causing damage, maintaining reliability while supporting high resolution.
2Quantity of substance
If the flexible flat cable is made wider to accommodate more terminals, then the connection capacity is improved, but the assembly difficulty increases and misalignment occurs
Solution Approach 1:
The patent implements preliminary detection of connection reliability through detection signal transmission before the display panel operates. The timing controller sends detection signals through the wide flexible flat cable to test all terminal connections, including the middle region terminals that are prone to solder skip. This preliminary action identifies assembly issues before they cause failures, resolving the contradiction between increased terminal quantity and assembly difficulty.
3Duration of action of moving object
If power is continuously supplied to the display panel, then the display operation is maintained, but the risk of panel burnout increases when connection problems occur
Solution Approach 1:
The patent implements preliminary anti-action by detecting connection reliability issues before they lead to panel burnout. The detection signal transmission mechanism identifies solder skip problems in the flexible connector before power is supplied or continues to be supplied to the display panel. When connection problems are detected, the power chip stops power output, preventing the harmful effect of panel burnout while maintaining display operation continuity under normal conditions.
Solution Approach 2:
The patent establishes a feedback control mechanism where the power chip monitors connection reliability through detection signals and adjusts power output accordingly. When the detection signal transmission indicates connection problems, the feedback loop stops power supply to prevent panel burnout. When connections are reliable, power continues to be supplied for normal display operation, resolving the contradiction between operation continuity and burnout risk.
Data Source
AI summary
A driving circuit and a liquid crystal display apparatus are provided. The driving circuit includes a printed circuit board, which includes a timing controller for providing a detection signal to a flexible connector, wherein the detection signal is used for testing connection reliability of the flexible connector, and a power chip tier detecting whether the detection signal returned from the flexible connector is received to obtain a detection result, and controlling power output based upon the detection result.