Electro-optical Device Light-Blocking Structure
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Solution Overview
Problem
In existing liquid crystal display devices, the distance between the light-blocking film and the TFT is increased due to the presence of signal line layers, making it difficult for the light-blocking film to sufficiently suppress light incidence on the TFT.
Innovation Solution
The electro-optical device incorporates a first light-blocking part with specific portions arranged between the substrate, scanning line layer, semiconductor layer, and gate electrode, with the lengths of these portions optimized to effectively block light from reaching the semiconductor layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-blocking film is disposed behind signal line layers to protect the TFT, then the TFT is protected from light, but the distance between the light-blocking film and TFT increases reducing blocking effectiveness
Solution Approach 1:
The light-blocking part extends in the thickness direction (second direction) with varying lengths at different positions. The third portion has a longer length than the first and second portions, creating a stepped configuration that blocks light from reaching the semiconductor layer while maintaining appropriate distances from other components.
Solution Approach 2:
The light-blocking part is divided into multiple portions (first, second, and third portions) with different lengths in the thickness direction. Each portion is positioned at different locations relative to the substrate, scanning line layer, semiconductor layer, and gate electrode, allowing differential light blocking at different regions.
2Object-affected harmful factors
If the light-blocking film is positioned closer to the TFT, then light blocking effectiveness improves, but the signal line layer cannot be properly disposed
Solution Approach 1:
The light-blocking part utilizes the thickness direction to resolve spatial conflicts. By extending portions of different lengths in the thickness direction, it achieves effective light blocking near the semiconductor layer while maintaining proper layer arrangement for signal lines in the planar direction.
Solution Approach 2:
Different portions of the light-blocking part have different lengths tailored to their specific positions. The third portion extends further to block light near the gate electrode, while the first and second portions have shorter lengths appropriate for their locations near the substrate and scanning line layer, respectively.
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 allows for more effective suppression of light incidence on the semiconductor layer, reducing the risk of display defects such as luminance unevenness and improving overall display quality.
Implementation Method 1
the first light-blocking part includes a first portion, a second portion, and a third portion, the first portion is provided between the substrate and the layer at which the scanning line is provided, the second portion is provided between the semiconductor layer and the layer at which the scanning line is provided, the third portion is provided between the gate electrode and the layer at which the scanning line is provided
Data Source
AI summary
An electro-optical device includes a substrate, a transistor including a semiconductor layer including a drain region, a source region, and a channel region and extending in a first direction, and a gate electrode, a scanning line, and a first light-blocking part, wherein the substrate, the semiconductor layer, the gate electrode, and a layer at which the scanning line is provided are arranged in a second direction, the first light-blocking part includes a first portion, a second portion, and a third portion, and a length of the first portion in the second direction, a length of the second portion in the second direction, and a length of the third portion in the second direction are longer in this order.