Display Device Single-Contact-Hole TFT Connection for High Luminance
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Solution Overview
Problem
Existing display devices face challenges in achieving high luminance due to the large number of contact holes and reduced area for light-emitting layers, which limits display luminance.
Innovation Solution
A display device design featuring a single contact hole connecting multiple thin-film transistors (TFTs) to electrodes, reducing the total number of contact holes and increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single first electrode is electrically connected to a single drive transistor via a single contact hole, then the connection structure is simple, but the total area of contact hole formation is large, thereby reducing the area of formation of light-emitting layers
Solution Approach 1:
The first electrode is divided into multiple segments (first electrode segment and second electrode segment) that are positioned in different pixel portions. Each segment is independently connected to TFTs in its respective pixel portion, eliminating the need for a single large contact hole while maintaining electrical connectivity. This segmentation allows the light-emitting layer formation area to be maximized.
2Reliability
If multiple contact holes are used to connect electrodes to TFTs, then electrical connectivity is ensured, but the total area of contact hole formation increases, making it difficult to achieve high display luminance
Solution Approach 1:
The single contact hole serves multiple functions: it provides electrical connection for both the first electrode segment and the second electrode segment to their respective TFTs. This multi-functionality reduces the total number of contact holes needed, thereby increasing the light-emitting area and achieving high display luminance while maintaining reliable electrical connectivity.
Data Source
AI summary
A display device includes at least the following: a single contact hole; n TFTs, where n is a natural number equal to or greater than two; and n electrodes, wherein the n electrodes are electrically connected to the respective n TFTs via the single contact hole.