Liquid Crystal Display Driving Method for Color Uniformity
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Solution Overview
Problem
Liquid crystal display panels with sub pixels divided into main and sub regions experience nonuniform color and flicker issues due to asymmetrical common voltage distribution, affecting color uniformity and brightness across the panel.
Innovation Solution
Implement area division into at least three areas and provide compensation signal voltages to each area to adjust data signal voltages in positive and negative polarity driving cycles, ensuring uniformity by enhancing or abating data signal voltages based on actual and target brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub pixels are divided into main region and sub region to improve large view angle color washout, then color shift is improved, but aperture ratio and transmission rate decrease
Solution Approach 1:
The pixel electrode is divided into a main region and a sub region, with the sub region further divided into multiple domains. This segmentation allows different voltage control for different areas, improving large view angle color performance while maintaining overall aperture ratio by optimizing the layout of the divided regions.
Solution Approach 2:
Different regions of the pixel electrode are assigned different electrical properties through independent voltage control. The main region and sub region can have different voltage levels applied, creating local quality differences that address color shift issues in specific areas without affecting the entire pixel structure.
2Ease of manufacture
If red or blue sub pixels are divided into main region and sub region, then large view angle color washout is improved, but nonuniform color and flicker issues occur due to asymmetrical common voltage distribution
Solution Approach 1:
The common voltage distribution is intentionally made asymmetrical across different regions of the panel, with different common voltage values applied to different areas. This asymmetrical compensation counteracts the inherent asymmetry in the divided pixel structure, eliminating nonuniform color and flicker issues while maintaining the benefits of region division.
Solution Approach 2:
The common voltage parameter is changed across different regions of the panel, with each region having its own optimized common voltage value. This parameter change compensates for the asymmetrical voltage distribution in divided sub pixels, ensuring uniform color display across the entire panel.
3Stability of the object's composition
If compensation signal voltages are applied to different areas, then color uniformity is improved, but device complexity increases
Solution Approach 1:
The compensation approach moves from a one-dimensional single common voltage to a two-dimensional spatially varying common voltage distribution. By introducing the spatial dimension, different common voltage values can be applied to different regions, achieving color uniformity without requiring complex temporal compensation circuits.
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 method addresses nonuniform color and flicker issues by ensuring consistent color representation across the panel, enhancing data signal voltage alignment with common voltage, thereby improving color uniformity in gray scale images.
Implementation Method 1
the liquid crystal display panel generally comprises a Thin Film Transistor Array Substrate (TFT Array Substrate), a Color Filter (CF) and a Liquid Crystal Layer arranged between the two substrates
Implementation Method 2
the electrical field can be generated in the liquid crystal layer to twist the liquid crystal molecules in the liquid crystal layer, and then to adjust the polarization of the light incident into the liquid crystal layer
Data Source
AI summary
Disclosed is a driving method of a liquid crystal display panel. Area division is implemented to obtain at least three division areas for individually providing a compensation signal voltage to each division area according to the difference of the actual brightnesses and the target brightnesses, and with the compensation signal voltage, implementing enhancement to a data signal voltage corresponded with a sub pixel, of which a difference of the data signal voltage (V+) in a positive polarity driving cycle or the data signal voltage (V−) in a negative polarity driving cycle and the common voltage (VCOM) is smaller, and implementing abatement to a data signal voltage corresponded with a sub pixel, of which a difference of the data signal voltage (V+) in the positive polarity driving cycle or the data signal voltage (V−) in the negative polarity driving cycle and the common voltage (VCOM) is larger.