Optical Sheet Reflecting Surface Reduces Light Attenuation
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in efficiently utilizing leaked light as illumination due to complex assembly processes and significant attenuation of reflected light when using separate reflecting members, leading to reduced light utilization efficiency.
Innovation Solution
A liquid crystal display device design where a reflecting surface is integrated into the optical sheet positioned closest to the light guiding plate, reflecting light emitted from the periphery back into the plate to minimize attenuation and simplify assembly by eliminating the need for additional reflecting members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a separate reflecting member is provided to prevent light leakage, then light utilization is improved, but assembly complexity and time increase significantly
Solution Approach 1:
The reflecting function is merged into the optical sheet by forming a reflecting surface on its light guiding plate-side surface. This eliminates the need for a separate reflecting member, reducing assembly steps while maintaining light utilization efficiency. The optical sheet simultaneously performs diffusion and light reflection functions.
Solution Approach 2:
The optical sheet is designed to perform multiple functions: light diffusion, light reflection, and light guiding. By integrating the reflecting surface onto the optical sheet, the system achieves multi-functionality, reducing the total number of components needed while improving light utilization efficiency.
2Reliability
If a separate reflecting member is provided, then light leakage is prevented, but the number of assembly steps increases
Solution Approach 1:
The reflecting function is combined with the optical sheet, eliminating the need for separate reflecting member assembly. This reduces the number of assembly steps and improves productivity while maintaining reliable light leakage prevention through the integrated reflecting surface.
3Loss of energy
If light is reflected by a separate reflecting member, then light utilization is improved, but significant attenuation occurs in the light guiding plate
Solution Approach 1:
The optical sheet acts as an intermediary between the light source and the reflecting surface. By positioning the reflecting surface on the optical sheet's light guiding plate-side surface, the system minimizes the number of times light passes through the light guiding plate, reducing attenuation while maintaining effective light utilization.
4Reliability
If a reflecting member with rectangular frame shape is used, then light leakage is prevented, but positioning precision requirements increase
Solution Approach 1:
The reflecting function is merged into the optical sheet, eliminating the need for separate reflecting members with precise rectangular frame shapes. This reduces positioning precision requirements while maintaining effective light leakage prevention through the integrated reflecting surface on the optical sheet.
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 enhances light utilization efficiency by reducing attenuation and simplifies the assembly process, allowing for effective use of leaked light as illumination without increasing the number of assembly steps.
Implementation Method 1
a optical sheet which is disposed between the liquid crystal panel and the light guiding plate, the optical sheet having a reflecting surface positioned at least at a periphery portion of the optical sheet which is corresponding side to the first edge surface
Data Source
AI summary
In a liquid crystal display device, a reflecting surface is attached to a portion, which overlaps with a periphery portion of a light guiding plate where the light incident section is position in a surface on the light guiding plate side in the dispersing sheet which is positioned farthest to the light guiding plate side among a plurality of optical sheets which are positioned between the light guiding plate and a liquid crystal panel. As a result, light which is emitted from the periphery portion of the light guiding plate is returned into the light guiding plate by being reflected by the reflecting surface, and after this, is emitted as illumination light from a light emitting surface while progressing within the light guiding plate.