Display Panel Parallelism via Case Groove Protrusions
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Solution Overview
Problem
Existing display devices face challenges in maintaining parallelism between the display panel and the case due to variations in adhesive thickness, leading to reduced adhesion strength and impaired parallelism, especially in electronic apparatuses like electrical viewfinders, where accurate alignment is crucial for image stability.
Innovation Solution
The implementation of protrusions on the case's bottom surface, which fix the distance between the display panel and the case, allowing for precise adhesion and uniform adhesive thickness, thereby securing high parallelism without adjusting weighting pressure or time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a low viscosity adhesive is used to achieve thin adhesive layer, then the adhesive thickness can be reduced to several μm, but the adhesion strength lowers and peeling occurs due to thermal contraction difference
Solution Approach 1:
The groove portions are provided at specific locations where adhesive thickness control is needed, creating local structural features that regulate adhesive distribution. This allows thin adhesive layers in critical areas while maintaining overall adhesion strength through strategic placement of groove structures.
Solution Approach 2:
The groove portions are pre-formed on the case surface before adhesive application. These grooves preliminarily define the adhesive distribution pattern, ensuring uniform thickness and preventing excessive adhesive accumulation that would compromise adhesion strength.
2Volume of moving object
If a high viscosity adhesive is used to increase the thickness, then the adhesive thickness can be increased, but variations occur in the method of adding pressure with respect to each position on the surface, and differences occur in the method of spreading the adhesive, resulting in non-uniform thickness and lowered parallelism
Solution Approach 1:
Groove portions are strategically positioned at locations where adhesive thickness uniformity is critical for maintaining parallelism. The grooves create localized control points that guide adhesive flow and distribution, ensuring consistent thickness across the bonding surface despite variations in weighting pressure.
Solution Approach 2:
The groove structure is pre-formed on the case before adhesive application and weighting. This preliminary structural feature establishes a template for adhesive distribution, compensating for pressure variations and ensuring uniform adhesive thickness that maintains display panel parallelism.
3Manufacturing precision
If the amount of adhesive coating in the groove is low to prevent overflow, then adhesive overflow is reduced, but the adhesion locations between the case and the substrate are reduced, and the adhesion strength is lowered
Solution Approach 1:
The groove portions are designed with specific dimensions and strategic placement to optimize adhesive retention. The grooves provide localized adhesive reservoirs that maintain sufficient adhesion locations while preventing overflow into areas that would compromise parallelism. The groove geometry is optimized to balance adhesive quantity with thickness uniformity.
4Strength
If the amount of adhesive coating in the groove is high to increase adhesion strength, then adhesion strength is improved, but the adhesive overflows outside of the groove, impairing parallelism by causing differences in the thickness of the adhesive in the surface
Solution Approach 1:
The groove portions are strategically positioned and dimensioned to contain adhesive at optimal thickness. By placing grooves at critical locations, the design allows higher adhesive concentration in controlled areas while preventing overflow into regions that would affect display panel parallelism, thus balancing adhesion strength with manufacturing precision.
5Manufacturing precision
If the weighting time is lengthened or weighting pressure is increased to lower differences in adhesive thickness, then adhesive thickness uniformity is improved, but the thickness of the adhesive becomes thinner due to the increase in pressure, or the time for the bonding process increases
Solution Approach 1:
The groove portions are pre-formed on the case before adhesive application and weighting. This preliminary structural feature establishes a template for adhesive distribution that maintains uniform thickness without requiring extended weighting time or excessive pressure, thus reducing bonding process time while achieving thickness uniformity.
Solution Approach 2:
The groove structure provides localized adhesive containment and distribution control, reducing the need for prolonged or high-pressure weighting to achieve uniform thickness. The grooves naturally guide adhesive flow and maintain consistent thickness, minimizing bonding process time while achieving manufacturing precision.
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 solution ensures high precision in maintaining parallelism between the display panel and the case, preventing image shifting during use, even when observing with one eye through an electrical viewfinder, and allows for appropriate adhesion strength by setting the protrusion height.
Implementation Method 1
bonding is performed by overlapping the panel face of the substrate and spreading the adhesive through weighting after coating the plane of the case with a moisture-curable adhesive
Data Source
AI summary
A display device includes a display panel in which a display surface is formed on a substrate; a case having a groove portion with which the display panel is fitted; an adhesive adhering a bottom surface of the groove portion and a rear surface of the display surface, and a protrusion formed on the bottom surface and having a predetermined height.