Relay Wire Decouples Contact Layout from Planarization in Pixel Arrays
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Solution Overview
Problem
In display devices, the layout of contact portions in the second-layer planarizing film is restricted by the circuit pattern of the first-layer planarizing film, limiting the degree of freedom in layout and affecting the image quality due to electrical connections with pixel electrodes.
Innovation Solution
A pixel array substrate structure with a two-layer planarizing film structure, where a relay wire connects the first and second contact portions, allowing for free layout of the second contact portion and improving planarization of the substrate surface, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two layers of planarizing films are formed to improve surface planarization, then the surface roughness is reduced, but the layout freedom of contact portions in the second layer is restricted by the circuit pattern of the first layer
Solution Approach 1:
A relay wire is introduced as an intermediary element between the first contact portion in the first planarizing film and the second contact portion in the second planarizing film. This relay wire allows electrical connection while enabling the second contact portion to be positioned independently from the circuit pattern constraints of the first layer, thus resolving the contradiction between maintaining surface planarization and achieving layout freedom.
2Device complexity
If contact portions of the second-layer planarizing film are positioned at the same locations as the first layer, then electrical connection is simplified, but the image quality is compromised due to restricted layout options
Solution Approach 1:
The relay wire serves as a mediator that decouples the positional relationship between contact portions in different layers. By introducing this intermediate connection element, the system achieves both simplified electrical connection (through the relay wire) and improved image quality (by allowing optimal positioning of the second contact portion away from circuit patterns).
Solution Approach 2:
The solution moves the connection problem from a two-dimensional planar alignment issue to a three-dimensional spatial arrangement. The relay wire extends the connection in the vertical dimension (through the planarizing films), allowing horizontal positioning freedom for the second contact portion while maintaining electrical connectivity.
Data Source
AI summary
A pixel array substrate structure includes: first and second planarizing films sequentially stacked on a substrate where a circuit unit is formed; and a relay wire formed between the first and second planarizing films, in which the relay wire electrically connects a first contact portion formed on the first planarizing film and connected to the circuit unit with a second contact portion formed at a position different from the first contact portion when seen from above, on the second planarizing film.