Array Substrate Pixel Electrode Slit Design for Color Shift and Aperture Ratio
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Solution Overview
Problem
Conventional LCDs face challenges in improving viewing angle, color shift, aperture ratio, and balancing common voltage due to excessive TFTs and voltage differences between main and secondary regions in sub-pixels.
Innovation Solution
The array substrate design features a layout with a control TFT connected to both main and secondary region pixel electrodes via a first connection electrode, with main and secondary region pixel electrodes having distinct slit structures and dimensions, reducing the number of TFTs and ensuring equal voltage across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If charge-sharing technology is used to divide sub-pixel into main and secondary regions with separate TFTs, then viewing angle is improved, but aperture ratio is reduced due to excessive number of TFTs
Solution Approach 1:
The patent merges the main region pixel electrode and secondary region pixel electrode into a single pixel electrode structure that is controlled by one TFT. The pixel electrode includes a main region electrode and a secondary region electrode that are electrically connected, eliminating the need for separate TFTs for each region while maintaining the multi-domain viewing angle improvement capability.
Solution Approach 2:
The pixel electrode is segmented into a main region electrode and a secondary region electrode with different slit patterns. The main region electrode has first slits and the secondary region electrode has second slits with different orientations, creating multiple domains within a single electrode structure controlled by one TFT.
2Adaptability or versatility
If separate main region pixel electrode and secondary region pixel electrode are used with charge-sharing TFT, then eight-domain displaying is achieved, but voltage balancing between regions becomes difficult
Solution Approach 1:
The patent combines both pixel electrode regions into a single electrically connected structure controlled by one TFT, eliminating the charge-sharing TFT and associated voltage balancing issues. The main region electrode and secondary region electrode are directly connected, ensuring they operate at the same potential without requiring complex voltage balancing circuits.
3Ease of manufacture
If conventional pixel electrode design is used, then manufacturing is simple, but color shift occurs due to same angle between stripe branches and horizontal/vertical stripes
Solution Approach 1:
The patent introduces asymmetry in the slit patterns of the pixel electrode. The main region electrode has first slits oriented at a first angle, while the secondary region electrode has second slits oriented at a second angle different from the first angle. This asymmetric design eliminates color shift by ensuring that stripe branches in different regions form different angles with the horizontal and vertical stripes, while still maintaining manufacturability through a standardized fabrication process.
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 design enhances color shift and aperture ratio while simplifying the control of common voltage, reducing the complexity of voltage balancing between main and secondary regions.
Implementation Method 1
When a voltage is applied to the pixel electrodes and the common electrodes, an electrical field is generated in the LC layer. The electrical field determines the orientation of the LC molecules, leading to adjust the polarization of incident light
Implementation Method 2
The electrical field determines the orientation of the LC molecules, leading to adjust the polarization of incident light to the LC layer
Implementation Method 3
The special pattern of the pixel electrode generates tilt electrical field to induce the LC molecules in different domain to lean towards different directions
Data Source
AI summary
The invention provides an array substrate, each sub-pixel comprising: a control TFT and a pixel electrode connected to control TFT; the pixel electrode comprising: a main region pixel electrode and a secondary region pixel electrode, layout with a gap in-between, and a first connection electrode electrically connected to the main region pixel electrode and the secondary region pixel electrode; the main and secondary region pixel electrodes being of special shape slit structure, the main region branch electrodes having a width smaller than width of the secondary region branch electrodes, the main region slit having a width smaller than width of the secondary region slit. The structural difference in the main and secondary region pixel electrodes is used to improve color shift, leading to reducing the number of TFTs in each pixel, improving pixel aperture ratio, reduces difficulty in balance control of best common voltage between main and secondary regions.