Liquid Crystal Panel Leakage Detection and Voltage Adjustment
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Solution Overview
Problem
TFT liquid crystal panels experience voltage asymmetry and electrical field overlap due to electrical leakage when turned off, leading to poor display performance.
Innovation Solution
A liquid crystal panel with a non-display area for detecting leakage current and adjusting the common voltage of a liquid crystal capacitor to maintain electrical neutrality, ensuring symmetrical voltage polarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If TFTs are used to drive pixels for high speed and high brightness display, then display performance is improved, but electrical leakage occurs when TFTs are turned off causing voltage asymmetry and residual images
Solution Approach 1:
The patent implements a feedback mechanism by detecting the leakage current from TFTs in the non-display area and using this information to adjust the common voltage. The detection unit measures the leakage current, and the adjustment unit modifies the common voltage accordingly to compensate for the voltage shift caused by leakage, thereby maintaining voltage symmetry and preventing residual images while preserving the high brightness performance of TFT-driven displays
Solution Approach 2:
The patent applies preliminary action by proactively adjusting the common voltage based on detected leakage current before significant voltage asymmetry develops. The system continuously monitors leakage current in the non-display area and preemptively modifies the common voltage to prevent voltage shift and residual image formation, rather than reacting after display degradation occurs
2Reliability
If common voltage is adjusted to compensate for leakage current, then voltage symmetry is improved, but device complexity increases due to additional detection and adjustment circuits
Solution Approach 1:
The patent applies universality by designing the non-display area TFTs to serve dual purposes: they function as regular display pixels during normal operation and simultaneously serve as sensing elements for leakage current detection. This multi-functionality allows the system to monitor leakage and adjust common voltage without adding separate dedicated sensing circuits, thereby compensating for voltage asymmetry while minimizing the increase in device complexity
Solution Approach 2:
The system implements self-service by using the TFTs themselves in the non-display area to detect their own leakage current. The detection unit measures the current flowing through these TFTs when they are turned off, and this self-detected information is used to automatically adjust the common voltage, eliminating the need for external complex monitoring systems
3Measurement precision
If leakage current is detected in non-display area, then voltage adjustment accuracy is improved, but manufacturing complexity increases due to additional data lines and gate lines
Solution Approach 1:
The patent applies dimensionality change by utilizing the non-display area, which is a spatial dimension already present in the display panel structure but underutilized. By placing detection TFTs in this peripheral region and extending gate lines into this area, the system achieves accurate leakage detection without interfering with the main display area pixel arrangement, thus improving measurement precision while maintaining manufacturing simplicity as the additional structures are confined to existing peripheral spaces
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents ion capture and residual issues, enhancing display performance by maintaining consistent voltage differences across the liquid crystal molecules.
Implementation Method 1
When the liquid crystal molecules switch continuously between the positive and negative pole, the difference between the common voltage of the first plate of the liquid crystal capacitor and the pixel voltage of the second plate remains the same, such that the liquid crystal molecules are electrically neutrality
Data Source
AI summary
The present invention discloses a liquid crystal panel and a voltage adjusting method. The liquid crystal panel includes a display area and a non-display area. The display area includes a plurality of TFTs for driving the sub-pixels connected with the TFTs to display images. The non-display area is an area having a predetermined dimension configured along a rim of the display area. The non-display area includes a predetermined number of TFTs, a predetermined number of data lines along a vertical direction, a target gate line extending from at least one gate line within the display area along a horizontal direction, wherein each of the data lines connects to one TFT. Each of the target gate line connects to at least one TFT, and each of the data lines is configured for detecting leakage current of the TFTs connected with the data line.