Dual Light Shielding Layers for Transistor Protection
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Solution Overview
Problem
Existing liquid crystal devices face challenges in improving light shielding properties, particularly in peripheral regions, where light incidence affects transistor characteristics, and existing solutions do not adequately address the need for reduced wiring resistance and enhanced light shielding in both display and peripheral areas.
Innovation Solution
A liquid crystal device configuration featuring a first and second light shielding layer, where the first transistor overlaps with the second light shielding layer in the display region and the second transistor overlaps with the first light shielding layer in the peripheral region, with the second light shielding layer positioned closer to the first transistor to enhance light shielding, and both layers being electrically connected to the gate electrode to prevent potential changes and maintain aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single light shielding layer is provided between the substrate and the transistor, then the structure is simple, but the light shielding properties are insufficient when strong light from the light source is incident
Solution Approach 1:
The light shielding function is segmented into multiple layers: a first light shielding layer and a second light shielding layer, with the second layer having higher light reflectivity than the first. This segmentation allows each layer to contribute differently to the overall light shielding performance, effectively blocking strong incident light while maintaining structural organization.
Solution Approach 2:
The patent employs composite light shielding structure combining materials with different light reflectivity characteristics. The first light shielding layer uses a material with lower reflectivity while the second layer uses a material with higher reflectivity, creating a composite structure that achieves superior light shielding properties compared to single-material layers.
2Area of moving object
If the aperture ratio is increased by narrowing the light shielding region in small liquid crystal devices, then the display area is improved, but the wiring resistance increases due to reduced space for scanning lines
Solution Approach 1:
The patent utilizes the vertical dimension by stacking light shielding layers at different heights (first light shielding layer and second light shielding layer). This allows the scanning lines to be positioned in the peripheral region where they can access both light shielding layers, reducing wiring resistance while maintaining a compact horizontal footprint that preserves aperture ratio.
Solution Approach 2:
The patent applies different light shielding configurations to different regions: the display region uses both first and second light shielding layers for optimal light blocking, while the peripheral region is designed to accommodate scanning lines with reduced wiring resistance. This local differentiation allows simultaneous optimization of aperture ratio and wiring resistance.
3Ease of operation
If light is incident to the transistor in the peripheral region, then the transistor can be driven, but the characteristics of the transistor change due to light exposure
Solution Approach 1:
The first light shielding layer acts as an intermediary between the incident light and the second light shielding layer/transistor. While the second layer provides primary light blocking, the first layer serves as a preliminary shield and structural component, working together to protect the transistor from light-induced characteristic changes while allowing necessary electrical connections.
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 configuration effectively shields light in both display and peripheral regions, improving light shielding properties while reducing wiring resistance and maintaining high display quality, even under increased light exposure.
Implementation Method 1
made of materials with light reflection properties like tungsten silicide, to enhance light shielding
Data Source
AI summary
A liquid crystal device includes: a liquid crystal layer disposed on a first substrate; a first light shielding layer disposed between the first substrate and the liquid crystal layer; a second light shielding layer disposed between the first light shielding layer and the liquid crystal layer; a first transistor provided in a display region; and a second transistor provided in a peripheral region that is a region around the display region, in which the first transistor is disposed so as to overlap with at least the second light shielding layer in a plan view, and in which the second transistor is disposed so as to overlap with at least the first light shielding layer in a plan view.