Pixel Array Slit Angles for LCD Color Shift Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) panels with large viewing angles suffer from color shift and inadequate color saturation, particularly at middle-low gray levels, due to optical characteristics of liquid crystal molecules, leading to color washout and biases in side view images compared to front view images.
Innovation Solution
A pixel array design featuring first, second, and third color pixel units with distinct acute angles, area ratios, and voltage ratios of pixel electrodes, along with the use of sharing switch devices and capacitors, to adjust the orientation and voltage of pixel electrodes, mitigating color shift issues by optimizing the alignment and voltage distribution across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-domain vertical alignment (MVA) LCD panel is used to achieve wide viewing angle, then viewing angle is improved, but color shift and color washout occur under different viewing angles
Solution Approach 1:
The patent applies local quality by creating multiple alignment regions within a single pixel region, where each region has different tilt angles (e.g., +θ, -θ, 0°) relative to the scan line direction. This causes liquid crystal molecules to orient in different directions within the same pixel, enabling wide viewing angles while maintaining color accuracy by locally optimizing the alignment characteristics for different viewing directions.
Solution Approach 2:
The patent segments the pixel region into multiple alignment regions, each with distinct liquid crystal molecule orientations. By dividing the pixel into segments with different tilt angles, the system achieves multiple viewing angle characteristics simultaneously, resolving the contradiction between wide viewing angle and color accuracy.
2Manufacturing precision
If display regions with different brightness are formed to mitigate color shift, then front view image quality is improved, but side view image still exhibits color bias
Solution Approach 1:
The patent extends local quality by introducing multiple alignment regions with different tilt angles within each display region. This allows each region to optimize color accuracy for specific viewing directions while maintaining brightness differentiation between display regions, thereby improving both front view and side view image quality simultaneously.
Solution Approach 2:
The patent employs asymmetry by using non-uniform tilt angles for different alignment regions (e.g., +θ, -θ, 0°) rather than symmetric arrangements. This asymmetric configuration enables different regions to compensate for color shift in different viewing directions, effectively mitigating color bias in side view images while preserving front view image quality.
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
The design effectively reduces color shift and enhances color accuracy across different viewing angles by adjusting the orientation and voltage of pixel electrodes, improving color saturation and consistency between front and side view images.
Implementation Method 1
an alignment pattern is designed to divide liquid crystal molecules of a same pixel region into a plurality of different alignment domains to achieve a wide viewing angle display effect
Implementation Method 2
forming display regions with different brightness in a single pixel region, and forming a plurality of alignment regions in each of the display regions with different brightness
Data Source
AI summary
A pixel array includes a first color pixel unit, a second color pixel unit and a third pixel unit, and the first, second and third pixel units respectively include a scan line, a data line, an active device electrically connected to the scan line and the data line and a first pixel electrode electrically connected to the active device. The first pixel electrode has at least one first slit, and a first acute angle is formed between an extending direction of the first slit and an extending direction of the scan line. Any two of the first acute angle of the first color pixel unit, the first acute angle of the second color pixel unit, and the first acute angle of the third color pixel unit are different.