Driver Circuit Light Transmission Area for LCD Sealing
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Solution Overview
Problem
Liquid crystal display devices with narrowed frame areas face challenges in achieving high sealing properties to prevent moisture penetration, which can adversely affect the characteristics of the liquid crystal composition due to insufficient adhesiveness or curing of the seal material.
Innovation Solution
A liquid crystal display device design featuring a thin film transistor substrate, a counter substrate, a liquid crystal composition, an oriented film, and a driver circuit with a light transmission area that enhances sealing by allowing direct contact between the seal material and insulating film, and utilizing a configuration where the light transmission area is surrounded by gate, source, and drain signal lines, and electrodes, forming a high sealing property area that prevents moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the frame area is narrowed to improve display area ratio, then the area for driver circuits and sealing structures is reduced, but the sealing property deteriorates due to insufficient space for adequate seal material application and curing
Solution Approach 1:
The patent introduces a light transmission area within the driver circuit region that allows UV light to penetrate through the oriented film and cure the seal material from above. This vertical dimension of UV irradiation enables adequate curing of seal material even in the narrowed frame area, resolving the contradiction between reduced frame area and sufficient sealing property
Solution Approach 2:
The driver circuit area is segmented into a light transmission area and a non-light transmission area. The light transmission area specifically facilitates UV curing of the seal material, while the non-light transmission area maintains normal driver circuit functionality. This segmentation allows the sealing function to be enhanced in a specific zone without compromising the overall driver circuit performance
2Strength
If the seal material is applied to ensure adequate sealing, then the adhesiveness improves, but the curing completeness deteriorates when the frame area is narrowed and UV light penetration is insufficient
Solution Approach 1:
The patent enables UV light to penetrate from the vertical direction through the light transmission area in the oriented film, allowing the seal material to be cured from above. This vertical UV irradiation path ensures complete curing of the seal material even when applied in adequate amounts for strong adhesiveness, resolving the contradiction between adhesiveness and curing completeness
3Stability of the object's composition
If the oriented film is formed over the driver circuit to define liquid crystal orientation, then the liquid crystal alignment is improved, but the sealing property deteriorates because the oriented film interferes with UV light curing of the seal material
Solution Approach 1:
The oriented film is designed with a light transmission area where it has reduced UV absorption properties, allowing UV light to penetrate through for seal material curing. In other areas, the oriented film maintains its full functionality for liquid crystal alignment. This local differentiation resolves the contradiction between liquid crystal orientation stability and sealing property
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
The design achieves improved sealing properties and enhanced adhesiveness of the seal material, preventing moisture penetration and maintaining the characteristics of the liquid crystal composition, while allowing sufficient curing of the seal material through ultraviolet irradiation.
Implementation Method 1
a seal material that sticks the thin film transistor substrate and the counter substrate together
Implementation Method 2
an oriented film that arranges orientation of the liquid crystal composition contacting with the thin film transistor substrate
Implementation Method 3
a high sealing property area in which the seal material and an insulating film come into direct contact with each other between the light transmission area and an outer edge of the thin film transistor substrate
Data Source
AI summary
A liquid crystal display device includes a thin film transistor substrate, a counter substrate that faces the thin film transistor substrate, a liquid crystal composition that is arranged between the thin film transistor substrate and the counter substrate, an oriented film that arranges orientation of the liquid crystal composition contacting with the thin film transistor substrate, a seal material that seals the liquid crystal composition between the two substrates, and a driver circuit. The driver circuit has a light transmission area that is formed inside of the driver circuit, and is higher in light transmittance than an area in which a non-transparent conductive film forming the driver circuit is formed, and a high sealing property area in which the seal material and an insulating film come into direct contact with each other between the light transmission area and an outer edge of the thin film transistor substrate.