Display Device Sloping Substrate Contact Area
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Solution Overview
Problem
In lateral electric field type liquid crystal display devices, the contact area between the conductive member and the transparent conductive film is reduced due to the expansion of the polarizer, leading to potential electrical disconnection and static buildup, especially when a narrower frame design is required.
Innovation Solution
A display device configuration featuring a first and second insulating substrate with a sloping portion on the outer surface of the second substrate, where the transparent conductive layer overlaps and is electrically connected to an electrode, maintaining contact even with expansion, thus preventing disconnection and static buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the polarizer is disposed close to the conductive member to achieve a narrower frame, then the frame width is reduced, but the contact area between the conductive member and transparent conductive film is reduced due to polarizer expansion
Solution Approach 1:
The invention introduces a sloping portion that creates a three-dimensional structure, allowing the transparent conductive film to maintain contact with the conductive member through the sloped surface even when the polarizer expands horizontally. This dimensional change from a flat two-dimensional contact to a sloped three-dimensional contact prevents loss of electrical connection.
Solution Approach 2:
The sloping portion is designed in advance to accommodate future expansion of the polarizer. By creating the sloped structure beforehand, the invention provides a buffer zone that absorbs the expansion stress and maintains contact, preventing electrical disconnection before it occurs.
2Length of moving object
If the transparent conductive film contact area is reduced due to polarizer expansion, then static buildup increases, but maintaining a narrow frame requires close proximity between polarizer and conductive member
Solution Approach 1:
By transitioning from a horizontal contact arrangement to a sloped three-dimensional contact structure, the invention maintains adequate contact area between the transparent conductive film and conductive member even when components are closely spaced, thereby preventing static buildup while achieving narrow frame design.
3Length of moving object
If the polarizer and conductive member are disposed close to each other for narrower frame, then manufacturing complexity increases due to precision requirements, but electrical connection reliability deteriorates due to expansion effects
Solution Approach 1:
The sloping portion is designed as a pre-computed geometric feature that automatically compensates for polarizer expansion. This beforehand cushioning approach reduces the need for ultra-precise positioning during manufacturing while ensuring reliable electrical connection, as the sloped structure provides a built-in tolerance buffer.
Data Source
AI summary
According to one embodiment, a display device includes a first insulating substrate including a first substrate end, a second insulating substrate including an outer surface and a second substrate end, an electrode located between the first substrate end and the second substrate end, and a transparent conductive layer disposed on a side on which the outer surface is located. The outer surface includes a flat portion and a sloping portion. A thickness on a side on which the second substrate end is located is less than a thickness on a side on which the flat portion is located. The transparent conductive layer overlaps the sloping portion and is electrically connected to the electrode.