Array Substrate Light-Transmitting Common Electrode for Adhesive Curing
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Solution Overview
Problem
In liquid crystal displays, the conductive adhesive extends to regions where the common electrode layer does not transmit light, resulting in poor curing and affected conductive performance due to lack of light exposure.
Innovation Solution
The array substrate design includes a second common electrode layer with a light-transmitting portion in a grid shape, allowing the conductive adhesive to extend onto the gate insulating layer and receive light for proper curing, and a method for manufacturing this substrate involves forming a first and second common electrode layer, a gate insulating layer, and a passivation layer to ensure effective electrical connection and light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive adhesive is extended to the common electrode layer region for electrical connection, then the electrical connection between array substrate and color filter substrate is improved, but the curing effect of the conductive adhesive deteriorates due to lack of light transmission
Solution Approach 1:
The common electrode layer is divided into a first common electrode layer (at the edge) and a second common electrode layer (at the inner side with light-transmitting portions). This segmentation allows different regions of the electrode layer to serve different functions: the first layer provides electrical connection where the conductive adhesive is applied, while the second layer with light-transmitting portions allows UV light to pass through for curing the frame sealing adhesive and conductive adhesive in the display region.
Solution Approach 2:
The second common electrode layer is designed with light-transmitting portions in the display region, creating local differences in optical properties. This allows light to pass through specific areas where adhesive curing is needed, while other areas maintain full electrode coverage for electrical functionality. The conductive adhesive can extend onto the gate insulating layer corresponding to these light-transmitting portions and receive adequate light for curing.
2Reliability
If the common electrode layer is made continuous for electrical functionality, then the electrical connection is maintained, but the light transmission to the liquid crystal layer is blocked
Solution Approach 1:
The common electrode layer is segmented into two distinct layers: the first common electrode layer that provides continuous electrical connection at the edge region, and the second common electrode layer that has light-transmitting portions in the display region. This segmentation resolves the contradiction by separating the electrical connection function from the light transmission function in different spatial regions.
Solution Approach 2:
The solution moves from a two-dimensional planar electrode structure to a three-dimensional layered structure. By stacking the first common electrode layer and the second common electrode layer at different positions and with different patterns, the invention achieves both continuous electrical connection (in the edge region) and light transmission (in the display region through the light-transmitting portions of the second layer).
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures good curing of the conductive adhesive, enhancing its conductive performance by allowing light exposure on the light-transmitting portion, thereby improving the overall performance of the array substrate and display device.
Implementation Method 1
The frame sealing adhesive is generally cured by a light source disposed on a back side of the array substrate and the color filter substrate
Data Source
AI summary
An array substrate, a method for manufacturing an array substrate, and a display device are provided. The array substrate includes a first substrate, a first common electrode layer, a second common electrode layer, a frame sealing adhesive and a conductive adhesive. The first common electrode layer is disposed at an edge of the first substrate and is in a grid shape; the second common electrode layer is disposed at an inner side the first common electrode layer, and includes a light-transmitting portion provided in a grid shape, and a gate insulating layer is provided on the light-transmitting portion. The frame sealing adhesive is disposed on the first common electrode layer. The conductive adhesive is disposed in the frame sealing adhesive and partially extends onto the gate insulating layer corresponding to the light-transmitting portion. The conductive adhesive is configured to electrically connect with a common electrode of a color filter substrate.