LCD Pixel Electrode Stack for Wide Viewing Angles
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices with twisted-nematic liquid crystal material operated by a vertically induced electric field have limited viewing angles, degrading display quality due to misalignment issues during substrate attachment and the need for a color filter-on-transistor (COT) type structure.
Innovation Solution
A liquid crystal display structure with gate and data lines crossing on a substrate to define a pixel region, featuring a thin film transistor, color filter pattern, pixel electrode, and common electrodes with transparent, opaque, and low reflective layers, allowing for in-plane electric fields and reducing light leakage, thus enhancing viewing angles and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a color filter pattern is formed on the array substrate (COT type), then misalignment issues during substrate attachment are compensated, but viewing angles are limited and display quality is degraded
Solution Approach 1:
The patent transitions from vertical electric field operation to in-plane electric field operation by repositioning the common electrode to the same substrate plane as the pixel electrode. This dimensional change allows the electric field to act horizontally within the plane of the substrate rather than vertically through the liquid crystal layer, enabling wider viewing angles while maintaining alignment precision through the color filter pattern on the array substrate.
Solution Approach 2:
The patent changes the orientation and direction of the electric field parameter from vertical to in-plane direction. By modifying the electrode configuration to create in-plane electric fields, the liquid crystal molecules can rotate more effectively across a wider range of angles, improving viewing angle performance while the color filter pattern continues to provide alignment compensation.
2Device complexity
If vertically induced electric field is used with twisted-nematic liquid crystal material, then device structure is simplified, but viewing angles are limited and display quality is degraded
Solution Approach 1:
The patent repositions the common electrode from a separate substrate to the same substrate plane as the pixel electrode, enabling in-plane electric field operation. This spatial reconfiguration allows the electric field to act horizontally within the substrate plane, causing liquid crystal molecules to rotate in a plane that provides wider viewing angles while maintaining relatively simple device structure.
Solution Approach 2:
The patent enables dynamic control of liquid crystal molecule orientation through in-plane electric fields that can be applied across the entire substrate area. This dynamic field application allows the molecules to rotate and realign more effectively for different viewing angles, improving display quality without requiring complex additional structures.
3Manufacturing precision
If color filter pattern is formed on array substrate, then alignment margin is provided, but additional black matrix processes are required
Solution Approach 1:
The patent makes the color filter pattern on the array substrate serve multiple functions: it provides alignment margin during substrate attachment and simultaneously acts as a light shielding structure. By eliminating the need for separate black matrix patterns, the patent reduces manufacturing steps while maintaining both alignment precision and light blocking functionality.
Solution Approach 2:
The patent merges the alignment function and light shielding function into a single color filter pattern structure on the array substrate. This consolidation eliminates the need for separate black matrix processes, simplifying manufacturing while providing both alignment margin and optical blocking in one integrated structure.
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 solution provides a wider range of viewing angles and improved display quality by eliminating misalignment concerns and reducing light leakage, while maintaining a compact design without the need for additional black matrix processes.
Implementation Method 1
a voltage applied between the electrodes induces an electric field across the liquid crystal material. Alignment of the liquid crystal molecules in the liquid crystal material changes in accordance with the intensity of the induced electric field into the direction of the induced electric field
Implementation Method 2
Alignment of the liquid crystal molecules in the liquid crystal material changes in accordance with the intensity of the induced electric field into the direction of the induced electric field, thereby changing the light transmittance of the LCD device
Data Source
AI summary
A liquid crystal display structure is provided. The liquid crystal display structure includes a gate line and a data line crossing each other on a substrate to define a pixel region, a thin film transistor connected to the gate line and the data line, a color filter pattern in the pixel region, and a pixel electrode in the pixel region. The pixel electrode is above the color filter pattern and is a stack structure including a transparent layer, an opaque layer and a low reflective layer.