Electro-optical Device Light Shielding Transistor Boundary
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in increasing the opening ratio while maintaining effective light shielding properties, which is crucial for preventing optical leakage current and display failures like flickering.
Innovation Solution
The electro-optical device incorporates a light shielding area with a first conductive layer, a second conductive layer, and a conductor part surrounding the transistor, where the edge of the conductor part forms a boundary between the light shielding and transmission areas, optimizing the layout to reduce the non-opening area and enhance the opening ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light shielding structure is provided in the non-opening area, then light shielding property is improved, but opening ratio is reduced
Solution Approach 1:
The light shielding structure is extended from a two-dimensional planar configuration into the third dimension by forming side surface light shielding portions that protrude toward the liquid crystal layer. This vertical extension allows the light shielding function to be achieved without increasing the horizontal footprint, thereby maintaining the opening ratio while improving light shielding property.
Solution Approach 2:
The light shielding structure is divided into multiple segments: a planar light shielding portion at the base and side surface light shielding portions that extend vertically. This segmentation allows each part to perform its function efficiently - the base portion provides horizontal shielding while the side portions provide vertical shielding, achieving comprehensive light blocking without excessive area occupation.
2Area of stationary object
If non-opening area is decreased to increase opening ratio, then opening ratio is improved, but light shielding property deteriorates
Solution Approach 1:
By extending the light shielding structure vertically into the third dimension with side surface portions, the patent achieves effective light shielding with minimal horizontal area occupation. This allows the non-opening area to be minimized while maintaining strong light shielding properties through the vertical protrusions that block light from reaching the TFT.
3Object-affected harmful factors
If light shielding structure is extended to improve light shielding property, then light shielding property is improved, but device complexity increases
Solution Approach 1:
The side surface light shielding portions are merged with the gate electrode structure, forming an integrated configuration where the gate electrode serves dual purposes: electrical function and light shielding function. This merging reduces the number of separate components and simplifies the manufacturing process while achieving improved light shielding property.
Data Source
AI summary
A light shielding area including a first conductive layer, a second conductive layer, a first conductor part disposed between the first conductive layer and the second conductive layer, and a transistor surrounded by the first conductive layer, the second conductive layer, and the first conductor part, and a light transmission area surrounded by the light shielding area are provided, wherein an edge of the first conductor part forms a part of a boundary between the light shielding area and the light transmission area.