TFT-LCD Common Electrode Voltage Correction via Region Segmentation
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Solution Overview
Problem
In Thin Film Transistor Liquid Crystal Display (TFT-LCD) panels, the charge conservation state between the liquid crystal capacitor, energy storage capacitor, and parasitic capacitor leads to a capacitance coupling effect, causing the common electrode voltage to deviate from its preset value, resulting in poor brightness and image quality due to uneven sub-pixel voltages.
Innovation Solution
The method involves dividing the common electrode layer into regions, applying initial voltages, measuring deviations, identifying color shift regions, adjusting initial voltages to match the preset value, determining gray-scale compensation values, and compensating sub-pixel data voltages to maintain uniformity and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the common electrode voltage is adjusted to compensate for voltage deviations, then the image quality and brightness uniformity are improved, but the device complexity and power consumption increase due to region division and multiple voltage adjustment steps
Solution Approach 1:
The common electrode layer is divided into multiple regions (first region, second region, third region) with different initial voltages applied to each region. This segmentation allows targeted compensation for voltage deviations in different areas of the display panel, improving brightness uniformity while managing the complexity through systematic region-based control
Solution Approach 2:
Different initial voltages are applied to different regions of the common electrode layer based on their specific voltage deviation characteristics. The first region receives a first initial voltage, the second region receives a second initial voltage, and the third region receives a third initial voltage, allowing each region to be optimized for its local requirements rather than using a uniform approach
2Manufacturing precision
If region division and multiple voltage adjustments are implemented, then the brightness uniformity is improved, but the manufacturing process complexity increases
Solution Approach 1:
Initial voltages are applied to the common electrode layer before the display panel is fully assembled and before actual operation. This preliminary voltage application allows for pre-compensation of voltage deviations, ensuring that the panel starts with corrected voltage distribution rather than requiring complex real-time adjustments during operation
Solution Approach 2:
The initial voltage parameter is changed across different regions of the common electrode layer. By adjusting the voltage parameter (first initial voltage, second initial voltage, third initial voltage) for each region based on measured deviations, the system achieves precise voltage uniformity without requiring complex structural modifications
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
This approach effectively counteracts voltage deviations, enhances image quality by ensuring uniform brightness across the display panel, and reduces power consumption by minimizing the amplitude of data compensation adjustments.
Implementation Method 1
the liquid crystal capacitor, the energy storage capacitor and the parasitic capacitor between gate and source of the Thin Film Transistor (TFT) in a pixel unit of the TFT-LCD reach a charge conservation state
Implementation Method 2
Thin Film Transistor Liquid Crystal Display (TFT-LCD) has the characteristics of light weight, flat-panel appearance, low power consumption
Data Source
AI summary
The present application relates to a correction method for a display panel and a display device, including: after dividing a common electrode layer of a display panel into at least one region, applying corresponding initial voltage to each region and measuring the initial voltages; and then according to a preset voltage, firstly coarsely adjusting the initial voltage of a color shift region, and then finely adjusting a data voltage of a sub-pixel corresponding to each sub-pixel in the color shift region.