LCD Polarizer Edge Bonding for Thermal Stress Management
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Solution Overview
Problem
In liquid crystal display devices, the differing thermal shrinkage rates of substrates, polarizers, and frames cause the polarizer to shrink differently, leading to potential peeling off of bonding layers and increased device thickness or picture-frame width.
Innovation Solution
A liquid crystal display device design featuring a rectangular polarizer with a first bonding layer on the upper surface and a second bonding layer on the lower surface, both positioned towards the edges, to secure the polarizer to the panel and frame respectively, with an adhesive layer outside the second bonding layer area to manage thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the polarizer is directly bonded to the liquid crystal display panel and frame, then the device structure is simplified, but the bonding layers may peel off due to differential thermal shrinkage
Solution Approach 1:
The bonding structure is segmented into multiple bonding layers positioned at different locations. The first bonding layer bonds the polarizer to the liquid crystal display panel, while the second bonding layer bonds the polarizer to the frame. This segmentation allows each bonding layer to independently manage thermal stress, preventing peeling while maintaining structural simplicity.
Solution Approach 2:
Different bonding layers are applied at specific locations rather than uniformly across the entire polarizer surface. The first bonding layer is positioned at a first location and the second bonding layer at a second location, creating local quality variations that optimize thermal stress distribution and prevent peeling at critical interfaces.
2Strength
If a back plate is arranged between the frame and liquid crystal display panel, then structural support is improved, but device thickness increases
Solution Approach 1:
The back plate component is extracted from the device structure and replaced by the bonding layer system. The first and second bonding layers provide the necessary structural support and thermal management functions previously performed by the back plate, eliminating the need for this additional component and reducing overall device thickness.
3Object-affected harmful factors
If light-shielding double-faced tape is arranged inside the frame, then light shielding is improved, but picture-frame width increases
Solution Approach 1:
The light-shielding function is merged with the bonding layers. The first and second bonding layers serve dual purposes: bonding the polarizer to the panel and frame, and providing light shielding. This integration eliminates the need for separate light-shielding components inside the frame, maintaining light shielding effectiveness while reducing picture-frame width.
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 prevents peeling off of bonding layers and allows for a narrower picture-frame by managing thermal stress and reducing the thickness of the device.
Implementation Method 1
a first bonding layer arranged only at a position biased toward any of edges on an upper surface of the polarizer, and bonding the polarizer to the liquid crystal display panel
Implementation Method 2
a second bonding layer arranged only at a position biased toward any of edges on a lower surface of the polarizer, and bonding the frame to the polarizer
Implementation Method 3
an adhesive layer having a lower adhesive force than that of the second bonding layer may be arranged outside a region in which the second bonding layer is arranged, between the lower surface and the frame
Data Source
AI summary
A liquid crystal display device of the invention includes: a rectangular polarizer attached to a liquid crystal display panel; a frame-shaped frame having four sides; a first bonding layer arranged only at a position biased toward any of edges on an upper surface of the polarizer, and bonding the polarizer to the liquid crystal display panel; and a second bonding layer arranged only at a position biased toward any of edges on a lower surface of the polarizer, and bonding the frame to the polarizer.