High Reflectivity Optical Member for LCD Light Leakage
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Solution Overview
Problem
In transmissive liquid crystal display apparatuses, the use of components with low reflectivity near the optical sheet leads to light leakage and reduced light utilization efficiency, resulting in lower brightness and non-uniformity, particularly in the peripheral regions.
Innovation Solution
An optical member with higher reflectivity than the support portions is disposed between the optical sheet and the support portions, reducing light loss and enhancing light utilization efficiency by reflecting light emitted from the light-emitting units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If components with low reflectivity (such as middle chassis) are disposed near the optical sheet to support the display panel, then structural support is provided, but light emitted from the light-emitting unit leaks through these components and is absorbed, resulting in reduced light utilization efficiency
Solution Approach 1:
A reflective sheet is introduced as an intermediary component between the light-emitting unit and the middle chassis. This reflective sheet intercepts light that would otherwise leak through the low-reflectivity support components, reflecting it back toward the display panel. The reflective sheet thus mediates between the structural support requirement and the light efficiency requirement, allowing both functions to coexist without compromising either.
2Ease of manufacture
If components with low reflectivity are used near the optical sheet, then manufacturing cost is reduced and structural simplicity is maintained, but brightness is reduced particularly in peripheral regions, resulting in non-uniformity in brightness
Solution Approach 1:
The reflective sheet is strategically positioned only in the peripheral regions where light leakage is most problematic. This local application of high reflectivity material addresses the brightness uniformity issue in critical areas without requiring complete replacement of all support components. The local quality approach maintains manufacturing simplicity while improving brightness uniformity where it matters most.
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 implementation of a high-reflectivity optical member between the optical sheet and support portions significantly enhances brightness and improves uniformity across the display panel, particularly in peripheral regions, leading to improved light source device performance.
Implementation Method 1
an optical member... has a reflectivity that is higher than that of the support portion with respect to light emitted from the light-emitting unit
Data Source
AI summary
An optical member is disposed between an optical sheet and a pair of middle chassis and top chassis that securely support an edge of an liquid crystal panel and an edge of the optical sheet. The optical member reflects light emitted from light-emitting diodes at high reflectivity so that an amount of light loss through the edge of the optical sheet is reduced. This allows for higher light utilization efficiency, thereby enhancing the brightness.