LCD Wiring Layout for Uniform Alignment Film Coating
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Solution Overview
Problem
In liquid crystal display devices, the progression towards higher definition and narrower frames makes it challenging to suppress coating unevenness of alignment films, particularly due to the difficulty in securing sufficient space for dummy wiring between narrow pitch wirings.
Innovation Solution
The design includes a configuration with lead-out portions and wirings disposed on either side of the insulating films, where the lead-out portions are inclined and the common and dummy wirings are strategically placed to maintain uniform thickness and prevent uneven film formation, allowing for higher definition and frame narrowing without coating issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dummy wiring is added to suppress coating unevenness, then film thickness uniformity is improved, but device complexity and space requirements increase
Solution Approach 1:
The lead-out portions serve multiple functions: they provide electrical connection, maintain spacing for uniform resin coating, and enable dummy wiring placement without requiring separate dedicated structures. The multi-layer configuration allows these lead-out portions to fulfill both functional and structural roles, reducing overall device complexity.
Solution Approach 2:
The patent merges the functions of lead-out portions and dummy wirings into a unified multi-layer wiring structure. The first and second wirings with their lead-out portions are combined with insulating films to create an integrated structure that simultaneously achieves electrical connectivity and coating uniformity without requiring separate dummy wiring additions.
2Area of stationary object
If lead-out portions are disposed at different heights on insulating films, then space for coating is maintained, but wiring structure complexity increases
Solution Approach 1:
The patent implements a nested structure where lead-out portions are positioned within the vertical stack of insulating films. The first lead-out portion is nested on the lower layer side of the first insulating film, while the second lead-out portion is nested on the lower layer side of the second insulating film, creating a compact nested arrangement that maintains coating space without excessive horizontal expansion.
Data Source
AI summary
A display device includes a first pixel electrode, a first switching element, a first wiring, a second pixel electrode, a second switching element, a second wiring, a third wiring, a fourth wiring, a first insulating film, a second insulating film, and an alignment film, in which the first wiring includes a first lead-out portion disposed outside the display region and located on a lower layer side of the first insulating film, the second wiring includes a second lead-out portion disposed adjacent to the first lead-out portion outside the display region and located on a lower layer side of the second insulating film, the third wiring is located on the lower layer side of the first insulating film, and the fourth wiring is located on the lower layer side of the second insulating film on the upper layer side of the first insulating film.