Reflector Stiffness via Overlapping Slits
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Solution Overview
Problem
Existing display devices with reflective sheets face challenges in maintaining a concave shape without reinforcing members, especially when the sheets are made thinner, leading to potential image unevenness and shaking due to vibration or impact.
Innovation Solution
The display device incorporates a reflective sheet with a four-sided bottom face part and side face parts that include first and second slits, allowing for overlapping regions to increase stiffness without additional reinforcing members, while maintaining the concave shape and reducing the developed surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reflective sheet is made thinner, then the device complexity is reduced, but the ability to maintain concave shape deteriorates
Solution Approach 1:
The reflective sheet is divided into multiple regions (first region, second region, third region) with different structural characteristics. The first region has a first concave shape, the second region has a second concave shape, and the third region has a flat or different curvature. This segmentation allows each region to independently maintain its shape while using thinner material overall.
Solution Approach 2:
Different regions of the reflective sheet have different local properties - specifically different concave curvatures and thickness distributions. The first region has a first concave shape optimized for certain light paths, while the second region has a second concave shape optimized for other light paths. This local quality variation allows the thin sheet to maintain complex 3D shapes where needed without requiring uniform thickness throughout.
2Device complexity
If the reflective sheet is made thinner, then the device complexity is reduced, but the reliability deteriorates due to image shaking from vibration or impact
Solution Approach 1:
The reflective sheet is segmented into multiple functional regions with different concave shapes and structural properties. This segmentation allows the thin sheet to achieve the necessary structural rigidity in specific areas to prevent image shaking from vibration or impact, while keeping the overall device complexity low through the use of thin material.
Solution Approach 2:
The reflective sheet incorporates multiple concave shapes (first concave shape in the first region, second concave shape in the second region) rather than flat or simple curved surfaces. These concave geometries provide structural rigidity and resistance to deformation from external forces like vibration and impact, thereby improving image stability while allowing the use of thinner material.
3Shape
If reinforcing members are added to maintain concave shape, then the shape maintenance improves, but the device complexity increases
Solution Approach 1:
Instead of using reinforcing members, the reflective sheet itself is segmented into multiple regions with different concave shapes. The first region has a first concave shape, the second region has a second concave shape, and the third region has a different configuration. This segmentation allows each region to independently maintain its shape through its own geometric structure, eliminating the need for additional reinforcing members.
Solution Approach 2:
The invention uses multiple concave shapes (first concave shape, second concave shape) formed directly in the reflective sheet to maintain the required geometry. These concave geometries provide inherent structural stability and shape maintenance capability without requiring external reinforcing members, thereby avoiding increased device complexity.
4Reliability
If reinforcing members are added to prevent image shaking, then the reliability improves, but the device complexity increases
Solution Approach 1:
The reflective sheet is divided into multiple regions (first region, second region, third region) with different concave shapes and structural properties. This segmentation allows the thin sheet to achieve the necessary structural rigidity in specific areas to prevent image shaking from vibration or impact, while keeping the overall device complexity low through the use of thin material.
Solution Approach 2:
The reflective sheet incorporates multiple concave shapes (first concave shape in the first region, second concave shape in the second region) rather than flat or simple curved surfaces. These concave geometries provide structural rigidity and resistance to deformation from external forces like vibration and impact, thereby improving image stability while allowing the use of thinner material.
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 ensures the concave shape is easily maintained and reduces image shaking and unevenness, even when the reflective sheet is made thinner, without the need for additional support, and without increasing the developed surface area.
Implementation Method 1
The reflector reflects light from the light source
Data Source
AI summary
A display device includes a display portion, a light source, and a reflector. The reflector reflects light from the light source. The reflector has a rectangular bottom part, first and second peripheral parts that partially extend from first opposing sides of the bottom part, and third and fourth peripheral parts that extend from second opposing sides of the bottom part that are adjacent to the first opposing sides. The first and second peripheral parts and the third and fourth peripheral parts have overlapping regions that overlap each other.