Backlight Spacer Asymmetry for LCD Diffuser Plate Support
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Solution Overview
Problem
Large-screen liquid crystal display devices face challenges in reducing thickness while maintaining luminance, as existing spacer arrangements increase manufacturing costs and deteriorate optical characteristics due to blockage of light sources and excessive flexure of diffusing plates.
Innovation Solution
A back light unit design with a reduced number of spacers, where the upper half area has fewer spacers than the lower half area, supporting the diffusing plate in a manner that minimizes flexure and light blockage, allowing for improved luminance and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a plurality of spacers is arranged uniformly on the entire area of the bottom face of the casing to support the diffusing plate, then the diffusing plate flexure is prevented, but the manufacturing cost increases and light emission is blocked
Solution Approach 1:
The patent applies local quality by concentrating spacers only in the lower half area of the diffusing plate rather than uniformly distributing them across the entire surface. This localized arrangement provides sufficient support to prevent flexure while reducing the total number of spacers needed, thereby lowering manufacturing costs and minimizing light blockage in the upper areas.
Solution Approach 2:
The patent employs asymmetry by creating an unequal distribution of spacers between the upper and lower halves of the diffusing plate. Specifically, the lower half area contains spacers while the upper half area has fewer or no spacers, resulting in an asymmetric configuration that optimizes both structural support and light emission efficiency.
2Stability of the object's composition
If a plurality of spacers is arranged uniformly on the bottom face to support the diffusing plate, then the diffusing plate stability is improved, but the optical characteristic deteriorates due to light blockage
Solution Approach 1:
By applying local quality, the patent concentrates spacer placement in the lower half area where structural support is most needed to prevent flexure. The upper half area remains free of spacers, allowing unobstructed light emission and maintaining high illumination intensity while still achieving adequate diffusing plate stability.
Solution Approach 2:
The asymmetric spacer arrangement ensures that spacers are positioned only where they are structurally necessary (lower half), leaving the upper half clear for optimal light emission. This asymmetric configuration resolves the contradiction between stability and optical characteristics by differentiating functional requirements across different zones.
Data Source
AI summary
An electronic apparatus includes a back light unit that has a light source, an optical member that is arranged so as to face the irradiation direction of the light of the light source, and a spacer that supports the optical member from the light source side and is arranged in a state in which the optical member is arranged parallel to the direction of gravity or inclined with respect to the direction of gravity, and a display panel that is arranged so as to be superimposed on the optical member of the back light unit. In the back light unit, the number of spacers arranged in an upper half area of the optical member with respect to the direction of gravity is configured to be smaller than that of the spacers arranged in a lower half area of the optical member with respect to the direction of gravity.