Edge-Irradiated Photocuring Resin for LCD Reinforcing Plate
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Solution Overview
Problem
The existing techniques for adhering a reinforcing plate to a liquid crystal display panel using ultraviolet curing resin result in uneven curing, leading to large gaps between substrates and image yellowing due to varying curing shrinkage, which affects the display's optical transmissivity.
Innovation Solution
A method involving a light-transmitting reinforcing plate and a photocuring resin where light is irradiated from the edge of the laminated body, allowing the resin to cure gradually from the edge inward, ensuring uniform curing and minimizing substrate deformation by dispersing stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultraviolet rays are irradiated from the surface of the reinforcing plate to cure the resin, then the resin can be cured and the reinforcing plate can be adhered to the liquid crystal display panel, but the curing degree becomes uneven due to light blocking by the picture frame layer, causing large curing shrinkage and substrate deformation
Solution Approach 1:
Instead of irradiating ultraviolet light from the front surface (conventional method), the patent irradiates light from the rear surface of the liquid crystal display panel through the liquid crystal layer to cure the resin. This inverted irradiation direction allows uniform light distribution without being blocked by the picture frame layer, preventing uneven curing and substrate deformation while maintaining adhesion strength.
Solution Approach 2:
The patent changes the irradiation dimension from front-surface vertical irradiation to rear-surface transmission irradiation through the liquid crystal layer. This dimensional change in light propagation enables uniform curing across the entire resin area, including regions previously blocked by the picture frame layer, thereby eliminating localized over-curing and shrinkage.
2Shape
If the picture frame layer blocks ultraviolet light to provide ornamental function, then the aesthetic appearance is improved, but the curing degree of resin below the picture frame layer becomes low, causing uneven curing shrinkage
Solution Approach 1:
The patent inverts the light irradiation direction from front-surface to rear-surface, allowing ultraviolet light to pass through the liquid crystal layer and cure the resin uniformly without being blocked by the picture frame layer. This maintains the ornamental function of the picture frame layer while achieving uniform curing.
Solution Approach 2:
The liquid crystal layer acts as an intermediary medium that transmits ultraviolet light from the rear surface to the resin, enabling uniform curing while allowing the picture frame layer to maintain its light-blocking ornamental function on the front surface.
3Strength
If high curing degree is achieved at portions remote from the sealing material, then strong adhesion is obtained, but large curing shrinkage causes gap formation between substrates
Solution Approach 1:
By inverting the irradiation direction to shine light from the rear surface through the liquid crystal layer, the patent achieves uniform curing degree across all resin portions including those remote from the sealing material. This uniform curing prevents localized over-shrinkage that causes gap formation while maintaining strong adhesion.
Solution Approach 2:
The patent achieves homogeneous curing degree distribution throughout the resin by transmitting light through the liquid crystal layer from the rear surface, ensuring uniform shrinkage and preventing gap formation between substrates while maintaining consistent adhesion strength.
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 approach prevents large gaps between substrates and maintains uniform curing, reducing image distortion and enhancing display quality by ensuring consistent curing across the resin.
Implementation Method 1
a photocuring resin which is provided between the liquid crystal display panel and the reinforcing plate
Data Source
AI summary
A liquid crystal display panel including liquid crystal sandwiched between a pair of substrates is prepared. A light-transmitting reinforcing plate is prepared. A photocuring resin is provided between the liquid crystal display panel and the reinforcing plate. Light is irradiated to a side surface of a laminated body constituted of the liquid crystal display panel, the reinforcing plate and the photocuring resin. The photocuring resin is arranged to face the liquid crystal in an opposed manner. The light is allowed to advance to the inside of the photocuring resin from an edge portion of the photocuring resin. The light is allowed to advance to the inside of the reinforcing plate from an edge portion of the reinforcing plate, is propagated in the inside of the reinforcing plate, and is irradiated to the photocuring resin from the reinforcing plate at a position away from the edge portion of the reinforcing plate.