Thin LCD Panel Stress Reduction via Cushion Material and Peripheral Wall
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Solution Overview
Problem
Thin liquid crystal display panels face mechanical strength issues due to stress concentration at the boundary between the TFT and counter substrates, leading to cracking, especially when external forces are applied, and image quality is compromised by reflection at interfaces with front windows or touch panels.
Innovation Solution
A liquid crystal display device configuration that includes a mold with a peripheral wall bonded to the front window, and a cushion material or space between the liquid crystal display panel and the mold to absorb external forces, reducing stress concentration and using a transparent adhesive layer to support the panel and window, thereby preventing cracking and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of the liquid crystal display panel is reduced to meet miniaturization demands, then the device size is reduced, but the mechanical strength deteriorates and the panel becomes prone to cracking under external force
Solution Approach 1:
A cushion material is provided between the liquid crystal display panel and the housing to absorb external impact forces before they can reach the panel. This beforehand cushioning prevents stress concentration at the boundary between TFT and counter substrates, thereby preventing cracking while maintaining the thin panel structure.
2Strength
If a front window is attached to protect the liquid crystal display panel from external force, then the mechanical strength is improved, but reflection occurs at the interface reducing image quality
Solution Approach 1:
A transparent adhesive layer with refractive index close to that of the front window is used as an intermediary between the liquid crystal display panel and the front window. This intermediary layer reduces reflection at the interface by minimizing refractive index differences, thereby maintaining image quality while still providing mechanical protection.
3Stability of the object's composition
If the liquid crystal display panel is bonded directly to the housing, then the structural stability is improved, but stress concentration occurs at the boundary leading to cracking
Solution Approach 1:
The cushion material acts as an intermediary between the liquid crystal display panel and the housing, distributing external forces across a larger area rather than concentrating stress at the boundary. This intermediary layer maintains structural stability while preventing stress concentration that would lead to cracking.
4Adaptability or versatility
If a touch panel is added to enable finger input, then the functionality is improved, but the thickness and vulnerability to external force increase
Solution Approach 1:
The cushion material is positioned to provide beforehand cushioning protection for the entire assembly including the touch panel. This protects the thin multi-layer structure from external impacts while maintaining the necessary functionality and minimal thickness.
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 solution effectively reduces the risk of cracking in the liquid crystal display panel and minimizes image quality degradation by distributing external forces and reducing peeling stress, enhancing the mechanical reliability and image quality of thin liquid crystal display devices.
Implementation Method 1
a cushion material is interposed between the liquid crystal display panel and the mold
Implementation Method 2
using a transparent adhesive layer to support the panel and window
Data Source
AI summary
In a thin liquid crystal display device having a front window, a cushion material is interposed between a liquid crystal display panel and a mold in which a backlight is housed. When an external force is applied to the front window, the cushion material helps to avoid concentration of stress on a TFT substrate constituting the liquid crystal display panel. Thus, it is possible to prevent the TFT substrate from being cracked. Further, a peripheral wall portion is formed in the mold and is bonded to the front window, in order to prevent the phenomenon that the liquid crystal display panel is removed from the front window when an excess force is applied to a transparent adhesive material that bonds the front window and the liquid crystal display panel together.