Light-Shielding Film Segmentation for Transistor Light Leakage
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Solution Overview
Problem
In electro-optical devices like liquid crystal projectors, light leakage from peripheral areas can cause image quality issues due to reflections and transmissions from transistors, and existing light-shielding films can deteriorate transistor characteristics.
Innovation Solution
A light-shielding film with rectangular openings in the channel length direction of transistors is used, overlapping partially with the transistors on the substrate, to suppress light leakage and reflection without significantly affecting transistor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding film is provided on lower layer sides of transistors configuring the peripheral circuit, then light leakage and light reflection in the peripheral area are reduced, but the characteristics of the transistors deteriorate
Solution Approach 1:
The light-shielding film is divided into multiple segments: a first light-shielding film covering part of the transistor, and a second light-shielding film covering other parts. This segmentation allows selective shielding of light paths while preserving essential light needed for transistor operation, thus reducing light leakage and reflection without completely blocking light to the transistor structures.
Solution Approach 2:
Different regions of the light-shielding film have different shielding properties and positions. The first light-shielding film is positioned at a first position with specific light-shielding characteristics, while the second light-shielding film is positioned at a second position with different characteristics. This local differentiation allows optimized light control for each region, reducing overall light leakage and reflection while maintaining transistor functionality in critical areas.
2Manufacturing precision
If a light-shielding film is provided to prevent light leakage from the peripheral area, then image quality is improved, but the transistor characteristics deteriorate
Solution Approach 1:
The light-shielding film is segmented into first and second light-shielding films with different positions and characteristics. This segmentation enables precise control of light paths in different regions, effectively preventing light leakage that would degrade image quality while allowing necessary light to reach transistor structures for maintaining their characteristics.
Solution Approach 2:
Different portions of the light-shielding structure provide different levels of light shielding tailored to local requirements. This local quality approach ensures that light leakage is prevented in regions where it would affect image quality, while transistor regions receive appropriate light levels to maintain their electrical characteristics.
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 solution effectively prevents adverse influences on the display image from light leakage and reflection in the peripheral area while maintaining high-quality image display without deteriorating the transistor characteristics.
Implementation Method 1
a light-shielding film which is provided below the transistors so as to at least partially overlap with the transistors on the substrate in plan view
Data Source
AI summary
An electro-optical device includes: a light-shielding film provided below a transistor in a peripheral area surrounding a pixel area of the display. The light-shielding film includes a rectangular opening formed in a channel length direction of the transistor.