LCD Shielding Layer Reduces Panel Thickness
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in reducing the thickness of their display panels while maintaining performance and preventing moisture infiltration into transistors.
Innovation Solution
The LCD device incorporates a shielding layer between protection layers to prevent moisture infiltration and eliminates the organic layer between these layers, allowing for a thinner design without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional multi-layer structure with organic layers is used between protection layers, then moisture infiltration is prevented, but the display panel thickness increases
Solution Approach 1:
The patent removes the organic layer from between the first and second protection layers, extracting only the essential moisture barrier function while eliminating unnecessary thickness. The shielding layer is positioned to overlap the transistor channel and semiconductor layer, providing moisture protection through direct contact with the first protection layer and strategic positioning over critical components.
Solution Approach 2:
The shielding layer serves as an intermediary element between the first and second protection layers. It provides the necessary moisture barrier function while being in direct contact with the first protection layer, eliminating the need for additional organic layers and reducing overall panel thickness.
2Reliability
If the shielding layer is positioned to overlap the transistor channel and semiconductor layer, then moisture infiltration is prevented, but device complexity increases
Solution Approach 1:
The shielding layer performs multiple functions simultaneously: it acts as a moisture barrier by being in direct contact with the first protection layer, and it protects critical transistor components by overlapping the channel and semiconductor layer. This multi-functionality reduces the need for separate protective structures, thereby simplifying the overall device design.
3Manufacturing precision
If the first and second protection layers are formed of inorganic insulating material, then manufacturing precision is improved, but hydrogen infiltration into transistors occurs
Solution Approach 1:
The shielding layer acts as a mediator between the inorganic first and second protection layers. It prevents hydrogen generated from the second protection layer from infiltrating into the transistor by providing a barrier through direct contact with the first protection layer and strategic positioning over the transistor components.
Solution Approach 2:
The shielding layer is positioned in advance to prevent hydrogen infiltration before it can reach the transistor. By being in direct contact with the first protection layer and overlapping the transistor channel and semiconductor layer, it creates a preliminary barrier against harmful hydrogen infiltration.
Data Source
AI summary
A liquid crystal display device includes: a lower substrate including a display unit and a non-display unit; an upper substrate opposing the lower substrate; a gate line and a data line disposed in the display unit of the lower substrate; a light shielding layer defining a pixel region of the lower substrate; a pixel electrode disposed in the pixel region of the lower substrate; a pixel transistor disposed in the display unit of the lower substrate and connected to the gate line, the data line, and the pixel electrode; a driving transistor disposed in the non-display unit of the lower substrate; a first protection layer disposed on the pixel transistor and the driving transistor; a shielding layer disposed on the first protection layer, the shielding layer overlapping at least one of the pixel transistor and the driving transistor; and a second protection layer disposed on the shielding layer.