Reflective Sheet Bridge Design for Display Luminance Uniformity
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Solution Overview
Problem
In display devices with liquid crystal panels, luminance unevenness occurs due to differences in light reflectivity between the reflective sheet and the head portion of the fixing member, leading to conspicuous dark spots and deteriorated display quality, especially when the arrangement pitch of light sources is dense.
Innovation Solution
A reflective sheet with bridges formed by slits is attached to cover the head portion of the fixing member, with bridges passing through the central portion of a region surrounded by four light sources, preventing the rise of the reflective sheet from obstructing light sources and maintaining even luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflective sheet is attached to cover the head portion of the fixing member to prevent dark spots, then the display quality is improved, but the reflective sheet rises up and blocks light from the light sources, causing luminance unevenness
Solution Approach 1:
The reflective sheet is segmented into multiple regions by slits, creating bridges that separate the light-blocking function from the light-reflecting function. The bridges are positioned to cover the fixing member heads while the slit regions allow light to pass through to the light sources, preventing both dark spots and luminance unevenness simultaneously
Solution Approach 2:
Different regions of the reflective sheet are given different properties: the bridge portions maintain high reflectivity to cover the fixing members and prevent dark spots, while the slit portions are designed to be transparent or low-reflectivity to allow light to reach the light sources. This local differentiation resolves the contradiction between preventing dark spots and avoiding light blocking
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 minimizes luminance unevenness and enhances display quality by ensuring that the reflective sheet does not obstruct light from the light sources, maintaining consistent illumination across the display panel.
Implementation Method 1
the reflective sheet reflects light emitted from the light sources toward the display panel side
Data Source
AI summary
A reflective sheet is attached to a front face of a light source substrate so as to cover a head portion of a fixing member, a bridge across the head portion of the fixing member is formed by providing a slit in the reflective sheet, and the bridge is disposed so as to pass through a central portion of a region surrounded by four light sources around the head portion of the fixing member.