Gate Wiring as Common Electrode for LCD Side Visibility
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Solution Overview
Problem
Liquid crystal display (LCD) devices exhibit poor side visibility and complex metal structures, which increase manufacturing costs and hinder efficient liquid crystal alignment and driving schemes.
Innovation Solution
A display device with a simplified electrode structure, where the gate transmission wiring functions as both the gate electrode and common electrode, generating a horizontal electric field to control the liquid crystal layer, using materials like indium-tin oxide (ITO) or indium-zinc oxide (IZO), and including a transparent electrode layer and black matrix to enhance visibility and reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate gate electrode and common electrode are formed, then liquid crystal control function is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the gate electrode and common electrode into a single integrated electrode structure. The gate electrode extends into the pixel region to function simultaneously as a common electrode, eliminating the need for a separate common electrode and reducing overall device complexity while maintaining liquid crystal control functionality.
Solution Approach 2:
The gate electrode is designed to perform multiple functions: it serves as the gate electrode for transistor control in the non-pixel region, and simultaneously functions as the common electrode for liquid crystal control in the pixel region. This multi-functional design reduces the total number of electrodes required.
2Reliability
If complex metal structures are used for circuit patterns, then functionality is improved, but manufacturing cost increases
Solution Approach 1:
The gate transmission wiring structure is designed to serve dual purposes: as gate transmission wiring in the non-pixel region and as common electrode in the pixel region. This merging of functions reduces the number of metal layers and manufacturing steps required, thereby lowering manufacturing costs while maintaining circuit functionality.
3Ease of manufacture
If traditional electrode structure is used, then manufacturing process is simpler, but side visibility is poor
Solution Approach 1:
The gate electrode is extended from its traditional confinement to the gate line region into the pixel region, creating a three-dimensional electrode configuration that generates horizontal electric fields. This dimensional extension improves side visibility by enabling effective liquid crystal alignment from lateral directions while maintaining a relatively simple manufacturing 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
The solution simplifies the manufacturing process, reduces costs, and improves side visibility by integrating the gate and common electrodes, allowing for efficient control of the liquid crystal layer and light transmission.
Implementation Method 1
The gate transmission wiring may be a common electrode arranged to generate a voltage difference between the gate transmission wiring and the pixel electrode
Data Source
AI summary
A display device includes: a gate transmission wiring; a gate insulating layer disposed on the gate transmission wiring; and a pixel electrode and a data transmission wiring that are disposed on the gate insulating layer. When a gate signal voltage is applied to the gate transmission wiring, the gate transmission wiring may serve as a gate electrode that activates a semiconductor layer. In addition, when such a gate signal voltage is not applied thereto, the gate transmission wiring may form an electric field by a voltage difference between the gate transmission wiring and the pixel electrode, to thereby control a liquid crystal layer.