Liquid Crystal Display Line Defect Detection Using Sensor Electrodes
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Solution Overview
Problem
Existing methods for detecting line defects in liquid crystal display devices require a special circuit, increasing the circuit scale and external size of the display panel, making it necessary to develop a simpler configuration for effective line defect detection.
Innovation Solution
A liquid crystal display device with sensor electrodes arranged in a matrix form and a control unit that applies drive signals to detect line defects by determining if the detection values meet a predetermined criterion, allowing for linear distribution analysis to identify disconnections or short-circuits in the liquid crystal drive lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a special circuit is provided to detect line defects, then line defect detection capability is improved, but the circuit scale increases
Solution Approach 1:
The sensor electrodes originally designed for touch detection are made to serve dual purposes: touch detection and line defect detection. By applying test signals to the sensor electrodes and analyzing the detection values, the system can identify line defects without requiring separate dedicated detection circuits, thus achieving multi-functionality with existing components
Solution Approach 2:
The sensor electrodes and their associated detection circuits serve themselves by detecting both touch inputs and line defects using the same hardware infrastructure. The system utilizes the inherent properties of the sensor electrodes to perform self-diagnosis for line defects, eliminating the need for external special-purpose circuits
2Reliability
If a line connecting the line defect detection circuit, source line, and gate line is provided, then line defect detection is enabled, but the external size of the display panel increases
Solution Approach 1:
The detection function for line defects is merged with the existing touch detection system. The same sensor electrodes, signal lines, and control circuits used for touch detection are utilized for line defect detection, eliminating the need for separate wiring and reducing the external dimensions of the display panel
3Device complexity
If sensor electrodes are used for both touch detection and line defect detection, then the same circuit can be utilized, but detection accuracy must be maintained for both functions
Solution Approach 1:
The detection process is segmented into distinct operational modes: touch detection mode and line defect detection mode. During line defect detection, test signals are applied to sensor electrodes and the detection values are analyzed according to specific criteria (such as linear distribution patterns), while during normal operation, the same electrodes perform touch detection, thereby maintaining accuracy for both functions through context-specific analysis
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel and a driver that drives the liquid crystal panel. The driver includes a control unit that executes a display process of displaying an image on the liquid crystal panel, a touch detection process of detecting a touch on the liquid crystal panel, and a line defect determination process of determining the presence of a line defect in the liquid crystal panel. In the line defect determination process, the control unit applies a drive signal to each sensor electrode, determines whether a detection value detected from each of the sensor electrodes when the drive signal is applied meets a predetermined determination criterion, and determines that the line defect has occurred when the sensor electrodes whose detection values meet the determination criterion among the plurality of sensor electrodes are linearly distributed.