VA Pixel Structure With Single-TFT 8-Domain Voltage Division
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Solution Overview
Problem
The conventional 8-domain VA display structure with multiple TFTs is complex and costly to fabricate, due to the need for multiple transistors to control the display.
Innovation Solution
A pixel structure with a single thin film transistor (TFT) is designed, where the drain electrode is directly connected to both primary and secondary pixel electrodes through a doped region with a lower doping concentration, increasing resistance and allowing voltage division, enabling 8-domain VA display without additional TFTs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TFTs are used to control the 8-domain VA display structure, then the viewing angle is improved, but the device complexity and fabrication cost increase
Solution Approach 1:
The patent merges the control functions of multiple TFTs into a single TFT by integrating multiple pixel electrodes (primary pixel electrode and secondary pixel electrode) within one pixel structure. This allows one TFT to control multiple liquid crystal domains, achieving 8-domain VA display effects without requiring multiple TFTs, thus reducing device complexity while maintaining large viewing angle performance
Solution Approach 2:
The single TFT is designed to perform multiple functions by controlling both the primary pixel electrode and secondary pixel electrode. The TFT structure is enhanced to provide universal control capability for multiple liquid crystal domains, enabling one TFT to replace what traditionally required multiple TFTs, thereby simplifying the overall device structure
2Adaptability or versatility
If multiple TFTs are used to control the 8-domain VA display structure, then the viewing angle is improved, but the fabrication cost increases
Solution Approach 1:
By combining multiple pixel electrodes and their control functions into a single TFT structure, the patent reduces the number of TFTs required from multiple to one. This merging approach directly reduces fabrication costs by decreasing the number of TFT fabrication steps, material usage, and processing complexity, while still achieving the desired 8-domain VA display performance
3Adaptability or versatility
If multiple TFTs are used to control the 8-domain VA display structure, then the viewing angle is improved, but the number of fabrication steps increases
Solution Approach 1:
The patent merges multiple pixel electrode controls into a single TFT, thereby consolidating multiple fabrication steps into fewer steps. The single TFT structure with integrated primary and secondary pixel electrodes reduces the number of TFT fabrication cycles required, improving fabrication efficiency and productivity while maintaining the complex liquid crystal domain control needed for large viewing angles
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 simplifies the structure and reduces fabrication costs while maintaining a large viewing angle range, as one TFT can control 8-domain VA display, reducing the number of transistors and fabrication steps.
Implementation Method 1
a first doped region (63) in a gate insulation layer (62), wherein a doping concentration of the first doped region (63) is less than a doping concentration of each of the second doped regions (64)... the resistance between the drain electrode and the secondary pixel electrode of the thin film transistor is greater than the resistance between the drain electrode and the primary pixel electrode
Data Source
AI summary
A pixel structure includes: a gate electrode disposed on a base substrate; a gate insulation layer covering the gate electrode; a source electrode, an active region, a drain electrode, a first doped region and a secondary electrode metal layer disposed on an upper surface of the gate insulation layer sequentially; two second doped regions at two ends of an upper surface of the active region; and a passivation layer covering source electrode, a portion of the active region exposed to the second doped regions, the second doped regions, the drain electrode, the first doped region and the secondary electrode metal layer. The passivation layer is provided with a primary pixel electrode and a secondary pixel electrode disposed thereon, the primary pixel electrode is connected to the drain electrode, and the secondary pixel electrode is connected to the secondary electrode metal layer.