TFT Substrate Diagonal Pixel Electrode Division for LCD Panels
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Solution Overview
Problem
Existing LCD technologies face challenges in minimizing color shift effects when viewed from different angles due to unbalanced voltage-transmittance curves, leading to issues like mesh mura, capacitance coupling, and reduced transmittance efficiency.
Innovation Solution
The implementation of a diagonal division of pixel electrodes into multiple areas, with slits that separate the pixel electrode into insulated first and second areas, using conductive layers to connect and insulate these areas, thereby balancing capacitance and reducing color shift while maintaining high transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pixel electrode is vertically divided into light and dark regions, then color shift is reduced, but mesh mura occurs when displaying lower gray values
Solution Approach 1:
The pixel electrode is divided into multiple regions (light region and dark region) separated by slits, with each region independently controlled by data lines. This segmentation allows different voltage-transmittance curves for different viewing angles while avoiding mesh mura through proper electrical connection design
Solution Approach 2:
The patent transitions from vertical division to diagonal division of pixel electrodes. By changing the orientation and arrangement dimension, the patent achieves balanced capacitance coupling effects while maintaining color shift reduction and avoiding mesh mura artifacts
2Ease of manufacture
If the pixel electrode is horizontally divided into light and dark regions, then boundary management is easier and liquid crystal efficiency is improved, but unbalanced parasitic capacitances occur when data line signals change simultaneously
Solution Approach 1:
The patent uses asymmetric diagonal division of pixel electrodes rather than symmetric horizontal or vertical division. This asymmetric arrangement ensures that light and dark regions are positioned to balance capacitance coupling effects from data lines, preventing unbalanced parasitic capacitances while maintaining ease of boundary management
Solution Approach 2:
By changing from horizontal division to diagonal division, the patent achieves both ease of boundary management and balanced capacitance effects. The diagonal orientation optimizes the spatial relationship between electrode regions and data lines, balancing electrical characteristics
3Reliability
If the pixel electrode is surrounded by dark regions, then capacitance balance is achieved, but liquid crystal efficiency and transmittance are decreased due to longer boundary length
Solution Approach 1:
Instead of surrounding the light region with dark regions, the patent segments the pixel electrode into multiple independent regions (light and dark regions) separated by slits. This segmentation achieves capacitance balance through strategic positioning and electrical connections while minimizing boundary length and maximizing transmittance efficiency
Solution Approach 2:
The patent applies different properties to different regions: light regions for high transmittance and dark regions for capacitance balancing. By locally optimizing each region's function and position, the patent achieves overall capacitance balance without sacrificing transmittance efficiency
Data Source
AI summary
A thin film transistor (TFT) substrate includes a substrate, data lines, scan lines and pixel electrodes. The data lines and the scan lines intersect each other on the substrate for defining pixel areas. The pixel electrodes are disposed in corresponding pixel areas. Each of the pixel electrodes defines at least two slits by which the pixel electrode is divided into at least two first areas and at least two second areas. The first areas and the second areas are insulated with respect to each other. The first areas are disposed diagonally and the second areas are disposed diagonally.