Display Device Gate Driver Moisture Protection Structure
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Solution Overview
Problem
Liquid crystal display (LCD) devices are vulnerable to moisture permeation due to the characteristics of their sealing members, which can damage elements on the display substrate, leading to defects.
Innovation Solution
A display device design that includes a display substrate with a gate driver and data wiring in the non-display area, featuring a protective layer and column spacer made of transparent, acrylic materials, where the protective layer is formed to have a smaller height than the column spacer, and both are used to prevent moisture from reaching the connection portion between the gate and data wiring, thereby reducing the risk of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing members are used in LCD devices, then the device structure is formed, but moisture permeation occurs leading to defects
Solution Approach 1:
The protective structure is divided into multiple functional layers: a first protective layer extending from the first substrate surface over the connection portion, and a second protective layer extending from the second substrate surface over the connection portion. This segmentation allows each layer to independently address moisture permeation pathways, with the first layer blocking moisture from the first substrate side and the second layer blocking moisture from the second substrate side, thereby comprehensively preventing moisture-induced defects.
Solution Approach 2:
The connection portion serves as an intermediary structure that protrudes from the first substrate surface and is covered by both protective layers. This intermediary structure creates a multi-layered protective barrier around the gate driver circuit connection points, effectively mediating between the internal circuitry and the external environment to prevent moisture ingress.
2Reliability
If protective layers are added to prevent moisture permeation, then reliability improves, but device complexity increases
Solution Approach 1:
The first and second protective layers are formed using the same material and similar structural characteristics, allowing them to be manufactured through comparable processes. Both layers serve the universal function of moisture protection, with the first layer protecting from the first substrate side and the second layer protecting from the second substrate side. This multi-functional approach with standardized components reduces manufacturing complexity despite the added protective capability.
Data Source
AI summary
A display device includes: a display substrate including a display area and a non-display area adjacent to each other; and an opposing substrate opposing the display substrate. The display substrate includes: a pixel in the display area; a gate driver at the non-display area and including a gate and data wiring; an organic layer on the gate and data wiring; a column spacer on the organic layer; a connection portion connected to the gate and data wiring at contact holes respectively exposing the gate and data wiring; and a protective layer on the connection portion. In a top plan view, the protective layer has a same shape as a shape of the connection portion. The opposing substrate includes a black matrix at the display area to define a pixel area of the pixel and at the non-display area to define the display area and the non-display area.