LCD Polarization Plate Thickness Optimization
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Solution Overview
Problem
Conventional liquid crystal display devices with a lower polarization plate fixed structure struggle to achieve thinness due to the inclusion of double-sided tape thickness, which also leads to issues like foreign matter ingress and optical sheet shifting, compromising adhesion and display quality.
Innovation Solution
A liquid crystal display device design where the double-sided tape thickness (A) is greater than the lower polarization plate thickness (B), with A−B ranging from 0 to 50 μm, and the tape is adhered to the mold frame and optical sheet, ensuring the lower polarization plate is dropped inside, reducing overall thickness and improving adhesion without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lower polarization plate fixed structure is used, then adhesion and prevention of foreign matter ingress are improved, but device thickness increases due to inclusion of double-sided tape thickness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness relationship between the double-sided tape (A) and lower polarization plate (B), where A-B ranges from 0 to 50 μm. This parameter optimization allows the tape to provide sufficient adhesion while minimizing the overall thickness contribution of the tape assembly, thereby resolving the contradiction between reliable adhesion and thin device profile.
Solution Approach 2:
The patent uses partial action by having the double-sided tape extend slightly beyond the lower polarization plate thickness (A>B), providing excess adhesion capability in critical areas. This ensures complete coverage and bonding strength while the controlled excess (0-50 μm) prevents over-thickening the overall structure, balancing adhesion requirements with thickness constraints.
2Length of moving object
If double-sided tape thickness is reduced to make device thinner, then device thickness is improved, but adhesion quality and prevention of optical sheet shifting deteriorate
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing an optimal thickness relationship where A-B=0 to 50 μm. This ensures the tape maintains sufficient bonding strength and prevents optical sheet shifting while contributing minimal thickness to the overall device. The controlled parameter range balances both requirements effectively.
3Length of moving object
If conventional lower polarization plate dropped structure is used, then device thickness is reduced, but foreign matter ingress and optical sheet shifting occur
Solution Approach 1:
The patent applies preliminary action by having the double-sided tape extend beyond the lower polarization plate thickness (A>B), creating a preliminary protective barrier before assembly is complete. This excess tape coverage pre-prevents foreign matter from entering between the optical sheets and prevents shifting, while the controlled excess (0-50 μm) maintains thin device profile.
Solution Approach 2:
The patent uses the double-sided tape as an intermediary element that serves dual functions: it provides adhesion and simultaneously acts as a barrier against foreign matter ingress. By optimizing the tape thickness relative to the polarization plate (A-B=0 to 50 μm), the tape mediates between the need for protection and the need for thinness, preventing harmful effects while maintaining compact dimensions.
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 allows for a thinner liquid crystal display device while maintaining excellent adhesiveness and preventing foreign matter ingress and optical sheet shifting, ensuring better display quality by optimizing the thickness difference between the tape and polarization plate.
Implementation Method 1
the liquid crystal display panel is adhered to the mold frame by a double-sided tape
Implementation Method 2
an optical sheet group and a light guide plate that are disposed inside the mold
Data Source
AI summary
A liquid crystal display (LCD) device employs a lower polarization plate structure thinner than conventional devices. The device comprises: a LCD panel including first and second substrates, and liquid crystal between the first and second substrates; and a backlight on the first substrate side of the panel. The backlight includes a frame-like mold frame and an optical sheet inside the mold frame. The LCD panel is adhered to the mold frame by double-sided tape, and includes a lower polarization plate on the first substrate's surface. The double-sided tape is adhered to a peripheral portion of the first substrate on one side, and to the mold frame and a peripheral portion of the optical sheet on the other. Where A is the thickness of the double-sided tape and B the thickness of the lower polarization plate, A>B. The difference A−B satisfies 0<A−B<50 μm.