Electro-Optical Device Adhesive Extraction for Image Quality
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Solution Overview
Problem
Liquid crystal devices used in projectors experience image quality deterioration due to adhesive degradation and deformation under light exposure, leading to changes in the liquid crystal layer thickness and yellowing of the displayed image.
Innovation Solution
An electro-optical device design featuring a display panel sandwiched between two translucent plates with a sealing member, where the first translucent plate overlaps the outer edge of the display region, reducing adhesive exposure and deformation, and using thermally conductive materials for heat dissipation to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dust-proof substrates are bonded to the display panel using adhesive, then dust-proofing is improved, but the adhesive deteriorates under light exposure causing image quality deterioration
Solution Approach 1:
The patent extracts the harmful adhesive material from the optical path by positioning the dust-proof substrate's outer edge to overlap the display region, eliminating the need for adhesive in the area that would cause yellowing and image degradation while maintaining dust-proofing functionality
2Object-affected harmful factors
If the translucent plate is positioned to cover the display region, then dust-proofing is improved, but adhesive deformation occurs under light exposure
Solution Approach 1:
The adhesive is extracted from the light-exposed area by designing the translucent plate to overlap the display region, removing the source of adhesive degradation while preserving the bonding function in non-optical areas
Solution Approach 2:
The solution moves the problem from a two-dimensional bonding surface to a three-dimensional spatial arrangement where the translucent plate extends beyond the display region, allowing adhesive to be positioned only where it won't affect image quality
3Strength
If the adhesive bonds the display panel and dust-proof substrate, then structural integrity is improved, but yellowing occurs due to light exposure
Solution Approach 1:
The adhesive is removed from the optical path entirely by positioning the translucent plate to overlap the display region, eliminating yellowing while maintaining bonding strength in non-display areas through alternative bonding methods or material selection
Solution Approach 2:
The translucent plate serves as an intermediary structure that separates the bonding function from the optical function, allowing adhesive to be used only where it won't interfere with light transmission and image quality
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 suppresses image quality deterioration, including color unevenness, by minimizing adhesive degradation and deformation, and improving heat dissipation, thus maintaining the integrity of the displayed image.
Implementation Method 1
an electro-optical layer which is disposed between the plurality of pixel electrodes and the common electrode, and has optical characteristics that change in accordance with an electrical field
Implementation Method 2
using thermally conductive materials for heat dissipation to maintain image quality
Data Source
AI summary
An electro-optical device includes a first translucent plate, a display panel, and a second translucent plate that is bonded to a surface of the display panel on an opposite side from the first translucent plate. The display panel includes a first substrate including pixel electrodes provided in a display region, a second substrate including a common electrode, an electro-optical layer which is disposed between the pixel electrodes and the common electrode, and a sealing member that is provided in a sealing region along an outer edge of the display region and between the first substrate and the second substrate, and adheres the first substrate and the second substrate. When seen from a thickness direction of the first translucent plate, an outer edge of the first translucent plate overlaps the outer edge of the display region, or is positioned between the display region and the sealing region.