Liquid Crystal Display Panel Light Shielding Body
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Solution Overview
Problem
Stray light entering the semiconductor layer of thin film transistors in liquid crystal display devices causes degradation in image quality due to fluctuations in TFT characteristics, which existing light shielding techniques fail to sufficiently prevent.
Innovation Solution
A liquid crystal display panel design featuring a light shielding body formed in the same layer as the source and drain electrodes, positioned above the scanning line and connected through a contact hole in the insulating layer, effectively blocks light from reaching the semiconductor layer by reflecting it at the interface between different insulating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light shielding structure is used, then light shielding is provided, but the TFT characteristics are not sufficiently protected from light-induced degradation
Solution Approach 1:
The light shielding body is positioned at a different spatial location (above the scanning line and beside the semiconductor layer) rather than directly over the semiconductor layer, creating a three-dimensional light blocking configuration that prevents light from reaching the semiconductor layer through a different geometric approach
Solution Approach 2:
The insulating layer serves as an intermediary structure that allows the light shielding body to be electrically connected to the scanning line while maintaining physical separation, enabling the light shielding function without direct contact between the conductive light shielding body and the semiconductor layer
2Ease of manufacture
If the light shielding body is formed in the same layer as source and drain electrodes, then manufacturing is simplified, but electrical isolation from the semiconductor layer must be ensured
Solution Approach 1:
The insulating layer acts as an intermediary barrier between the light shielding body and the semiconductor layer, allowing both to be in the same manufacturing layer while maintaining electrical isolation through the insulating material that fills the space between them
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 prevents light from incident on the semiconductor layer, stabilizing TFT characteristics and enhancing image quality by reducing threshold voltage fluctuations and off-leakage currents, thereby improving the overall performance of the liquid crystal display device.
Implementation Method 1
effectively blocks light from reaching the semiconductor layer by reflecting it at the interface between different insulating layers
Data Source
AI summary
A liquid crystal display panel includes: thin film transistors provided in corresponding one of pixels and including a gate electrode, a source electrode, a drain electrode, and a semiconductor layer; a scanning line formed in a layer identical to that of the gate electrode and electrically connected to the gate electrode; and a first light shielding body formed in a layer identical to that of at least one of the source electrode and the drain electrode. The semiconductor layer is formed above the scanning line with an insulating layer interposed between the semiconductor layer and the scanning line, the first light shielding body is located above the scanning line and beside the semiconductor layer, and the first light shielding body and the scanning line are connected to each other through a contact hole made in the insulating layer.