Array Substrate Gate Electrode UV Curing LCD
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Solution Overview
Problem
The existing methods for forming a liquid crystal layer in gate-in-panel type LCD devices using vacuum dispensing and attaching apparatus result in an insufficiently cured seal pattern, which contaminates the liquid crystal layer due to the large size of the driving TFT in the non-active area, leading to increased process time and reduced productivity.
Innovation Solution
The array substrate design includes a gate electrode with a comb shape and spaced-apart gate bar portions, allowing for a higher open area ratio for UV penetration, ensuring sufficient curing of the seal pattern, and the method involves forming a gate line, gate electrodes, semiconductor layers, and passivation layers to create a compact gate driving circuit that allows for efficient UV curing of the seal pattern during the liquid crystal layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-sized driving TFT is used in the non-active area to ensure sufficient current driving capability, then the driving capability is improved, but the open area ratio for UV penetration decreases, resulting in insufficient curing of the seal pattern
Solution Approach 1:
The gate electrode is divided into multiple gate bar portions that are spaced apart from each other, creating a comb-shaped structure. This segmentation increases the open area ratio between the gate bar portions, allowing UV light to penetrate more effectively through the non-active area and cure the seal pattern completely, while still maintaining sufficient driving capability through the distributed gate structure
Solution Approach 2:
The gate electrode structure is optimized locally in the non-active area by creating spaced-apart gate bar portions specifically in the region where UV penetration is needed. This local structural modification allows sufficient UV light transmission for seal pattern curing while maintaining the necessary electrical driving capability through the distributed gate bars
2Reliability
If the driving TFT size is increased to improve driving capability, then the reliability is improved, but the fabrication time increases due to insufficient seal pattern curing
Solution Approach 1:
By segmenting the gate electrode into spaced-apart gate bar portions, the structure creates channels for UV light penetration through the non-active area. This enables complete and rapid curing of the seal pattern during liquid crystal layer formation, significantly reducing the fabrication time while maintaining the necessary driving capability through the distributed gate structure
3Reliability
If the driving TFT occupies large area in the non-active area, then the driving capability is improved, but the open area ratio for UV penetration decreases, leading to seal pattern contamination
Solution Approach 1:
The gate electrode is segmented into multiple spaced-apart gate bar portions that create open pathways for UV light to reach the seal pattern. This segmentation ensures complete curing of the seal pattern, preventing contamination from uncured sealant, while the distributed gate bars maintain sufficient electrical driving capability
Solution Approach 2:
The gate electrode structure is designed to convert the potential harm of blocking UV light into a benefit by using spaced-apart gate bar portions. The spaces between the gate bars allow UV penetration to cure the seal pattern, transforming what would be a harmful obstruction into a beneficial transparent structure that enables complete curing
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 design ensures complete curing of the seal pattern, reducing contamination and improving production yield while reducing the fabrication time for the liquid crystal layer, thereby enhancing the productivity of the LCD device.
Implementation Method 1
allowing for a higher open area ratio for UV penetration, ensuring sufficient curing of the seal pattern
Data Source
AI summary
A method of fabricating a liquid crystal display device includes: a first step of attaching a polarizing plate to an outer surface of a liquid crystal panel; a second step of attaching a tape carrier package (TCP) to the liquid crystal panel; a third step of coating a resin onto a rear surface of the TCP and a connection portion of the liquid crystal panel and the TCP; a fourth step of inspecting the TCP and the liquid crystal display panel; a fifth step of inserting the liquid crystal panel into a transferring means; a sixth step of transferring the transferring means; a seventh step of extracting the liquid crystal panel from the transferring means; a eighth step of attaching the TCP to a printed circuit board (PCB); a ninth step of inspecting the PCB, the TCP and the liquid crystal panel; and a tenth step of assembling the liquid crystal panel and a backlight unit with a plurality of frames.