Liquid Crystal Display Sub-Pixel Architecture for Color Shift Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays with Multi-Domain Vertically Aligned Mode (MVA mode) suffer from color shift when viewed from oblique angles, particularly affecting skin tones, due to non-monotonic transmittance-voltage characteristics.
Innovation Solution
A liquid crystal display is designed with pixel units divided into two sub-pixels, each generating distinct transmittance-voltage characteristics, allowing for a monotonic combined characteristic to mitigate color shift by forming two different pixel electrode voltages using a specific arrangement of data and scan lines, transistors, and capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MVA mode liquid crystal display is used to achieve wide viewing angle, then view angle is improved, but color shift occurs when viewed from oblique direction
Solution Approach 1:
Each pixel is divided into two sub-pixels with different liquid crystal material compositions. The first sub-pixel contains liquid crystal material with first optical characteristics, while the second sub-pixel contains liquid crystal material with second optical characteristics. This segmentation allows each sub-pixel to contribute differently to the overall transmittance, achieving a monotonic combined T-V characteristic that eliminates color shift while maintaining wide viewing angles.
2Power
If transmittance-voltage characteristic is non-monotonic in oblique direction, then MVA mode operation is achieved, but gray scales become indistinguishable causing color shift
Solution Approach 1:
Different regions of the pixel (sub-pixels) are assigned different liquid crystal material compositions with distinct optical characteristics. The first sub-pixel has liquid crystal material with first optical characteristics, while the second sub-pixel has liquid crystal material with second optical characteristics. This local differentiation ensures that when viewed from oblique directions, the combined transmittance maintains monotonic voltage dependence, preserving gray scale distinction and eliminating color shift.
Data Source
AI summary
A pixel unit in the present invention is divided into two sub-pixels. Each sub-pixel includes a thin film transistor, a liquid crystal capacitor and a storage capacitor. The two transistors respectively located in different sub-pixels are connected to different scan lines. One of the two transistors is connected to the data line through another transistor. Therefore, two different pixel voltages are formed in a pixel.