Reflective Sheet Cell Patterns for Edge-Balanced Display Illumination
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Solution Overview
Problem
Conventional light emitting apparatuses face limitations in improving surface light emission efficiency due to uneven luminance distribution, with the central part being brighter than the edges, despite adjustments in spacing between light emitting devices and the use of diffusion plates.
Innovation Solution
A light emitting apparatus with a reflective sheet that includes reflective cells with varying low-reflection patterns, where patterns closer to the edge are smaller or less saturated, to enhance light reflection towards the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffusion plate is used to diffuse light emitted from light emitting devices, then light emission uniformity is improved, but surface light emission efficiency is limited due to central brightness exceeding edge brightness
Solution Approach 1:
The reflective sheet incorporates low-reflection patterns with varying sizes at different locations. Patterns closer to the edge of the reflective sheet are smaller, while patterns in the central region are larger. This spatial variation in pattern size creates location-dependent light reflection characteristics, reducing the brightness difference between central and edge regions, thereby improving overall surface light emission efficiency while maintaining luminance distribution uniformity.
2Illumination intensity
If spacing between light emitting devices is adjusted to improve uniformity, then luminance distribution is improved, but device complexity increases
Solution Approach 1:
The reflective sheet acts as an intermediary component between the light emitting devices and the display panel. By incorporating low-reflection patterns with varying sizes, it mediates the light distribution without requiring complex spacing adjustments between the light emitting devices themselves. This approach achieves uniform luminance distribution while keeping the device arrangement simple.
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 solution improves surface light emission efficiency by reducing luminance differences and enhancing light reflection towards the edges, resulting in more uniform illumination.
Implementation Method 1
a reflective sheet that reflects light emitted from the plurality of light emitting devices
Implementation Method 2
the plurality of reflective cells include a plurality of low-reflection patterns
Data Source
AI summary
A light emitting apparatus includes: a circuit board; a plurality of light emitting devices connected to the circuit board; and a reflective sheet that reflects light emitted from the plurality of light emitting devices and includes a plurality of reflective cells which respectively accommodate the plurality of light emitting devices. The plurality of reflective cells include a plurality of low-reflection patterns. The plurality of low-reflection patterns include a pattern disposed closer to an edge of the reflective sheet, size of which is relatively smaller than size of other patterns.