Light Emitting Device with Segmented Diffuser for Contrast
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Solution Overview
Problem
Existing light emitting devices with surface light-emitting technology face challenges in reducing luminance unevenness and enhancing contrast ratios between light-emitting and non-lighting areas, particularly when local-dimming is performed, as light from emitting areas can enter adjacent non-lighting areas, leading to reduced contrast and insufficient luminance uniformity.
Innovation Solution
A light emitting device comprising a substrate with light sources, a demarcating member with ridge and inclined surface parts, and a light-diffusing plate with protrusions that surround each light source, designed to reflect and disperse light efficiently, preventing light from entering adjacent regions and improving contrast ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local-dimming of light sources is performed, then power consumption is reduced and lighting control is improved, but light from light-emitting areas enters adjacent non-lighting areas, resulting in reduced contrast ratio
Solution Approach 1:
The light-diffusing plate is divided into multiple regions with different protrusion structures. First protrusions surround individual light sources to control light distribution locally, while second protrusions are positioned in non-lighting areas to prevent light intrusion. This segmentation allows independent optimization of light control in different zones, enabling effective local-dimming while maintaining contrast ratio.
2Illumination intensity
If a diffusion plate with integrally formed convex parts is used, then luminance uniformity is improved, but contrast ratio between light-emitting and non-lighting areas is insufficient
Solution Approach 1:
Different regions of the light-diffusing plate are given different structures to perform different functions. Regions above light sources have first protrusions for uniform light diffusion, while non-lighting areas have second protrusions for light blocking and reflection. This local differentiation allows simultaneous achievement of luminance uniformity in lighting areas and high contrast ratio by preventing light leakage into non-lighting areas.
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 effectively reduces luminance unevenness and enhances contrast ratios by ensuring light is dispersed and reflected within its intended area, resulting in improved uniformity and luminance distribution when viewed from the light extracting surface.
Implementation Method 1
Each of the wall parts include a ridge part and an inclined surface part
Implementation Method 2
The light-diffusing plate is disposed above the light sources and having a plurality of first protrusions disposed on a first surface of the light-diffusing plate facing the substrate
Data Source
AI summary
A light emitting device includes a substrate, a demarcating member and a light-diffusing plate. The substrate has a plurality of light sources. The demarcating member includes a plurality of wall parts defining a plurality of compartments respectively corresponding to the light sources with each of the light sources being surrounded by corresponding ones of the wall parts defining a single compartment. Each of the wall parts include a ridge part and an inclined surface part. The light-diffusing plate is disposed above the light sources and having a plurality of first protrusions disposed on a first surface of the light-diffusing plate facing the substrate. Each of the first protrusions overlaps the inclined surface part of each of corresponding ones of the wall parts in a plan view. Each of the first protrusions surrounds a corresponding one of the light sources in the plan view.