Light-Emitting Device Dot Pattern Overlap for Luminance Uniformity
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Solution Overview
Problem
Existing light-emitting devices for liquid crystal display devices face challenges in achieving uniform luminance and color distribution due to limitations in the arrangement of light sources and dot patterns on light-guiding plates, leading to luminance unevenness and color unevenness.
Innovation Solution
The configuration of a light-emitting device with overlapping regions of dot patterns on lower and upper light-guiding plates, optimized arrangement of light sources, and varying dot pitches and sizes to enhance luminance distribution, combined with the use of reflective and optical sheets to improve frontal luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are disposed on side faces of light-guiding plates, then light emission is achieved, but luminance unevenness occurs
Solution Approach 1:
The light-emitting device is divided into multiple light-guiding plates (first, second, third, and fourth light-guiding plates) with light sources disposed on different side faces. Each light-guiding plate segment independently guides light from specific directions, and their combined effect achieves uniform luminance distribution across the entire emission surface, resolving the luminance unevenness problem of single-side illumination.
Solution Approach 2:
Different regions of the light-emitting device have different light source arrangements and dot pattern configurations. The first and second light-guiding plates have dot patterns on their light-emitting surfaces, while the third and fourth light-guiding plates have dot patterns on their side faces. This local differentiation optimizes light distribution in specific regions to achieve overall luminance uniformity.
2Illumination intensity
If dot patterns are formed on light guide plates, then light diffusion is improved, but color unevenness occurs
Solution Approach 1:
The device uses multiple light-guiding plates with dot patterns at different locations and orientations. The first and second light-guiding plates have dot patterns on their light-emitting surfaces, while the third and fourth light-guiding plates have dot patterns on their side faces. This segmentation of dot pattern functions reduces color unevenness by distributing diffraction effects across multiple independent patterns.
Solution Approach 2:
The dot patterns are arranged asymmetrically on different surfaces and orientations of the light-guiding plates. This asymmetric arrangement compensates for the directional nature of light diffusion, ensuring that color distribution remains uniform across the emission surface despite the inherent asymmetry of individual dot pattern diffraction.
3Manufacturing precision
If multiple light-guiding plates are used, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
Multiple light-guiding plates are merged into a single integrated light-emitting device structure. The first, second, third, and fourth light-guiding plates are arranged and combined to function as a unified system, where their individual light guidance and diffusion functions work together to achieve uniform luminance without requiring separate complex control systems.
Solution Approach 2:
Each light-guiding plate serves multiple functions: light guidance from specific directions, light diffusion through dot patterns, and color uniformity control. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving improved luminance uniformity.
4Illumination intensity
If dot pitch and size are varied, then luminance distribution is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The dot patterns have different pitches and sizes at different locations and on different light-guiding plates. This local variation in dot pattern parameters allows optimization of luminance distribution in specific regions, with each area's dot patterns tailored to its specific light guidance and diffusion requirements.
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 significantly reduces luminance and color unevenness, achieving more uniform light emission and improved frontal luminance by optimizing the arrangement of light sources and dot patterns on the light-guiding plates.
Implementation Method 1
dot patterns formed on light-guiding plates... varying dot pitches and sizes to enhance luminance distribution
Implementation Method 2
combined with the use of reflective and optical sheets to improve frontal luminance
Data Source
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AI summary
A light-emitting device of the present disclosure includes: a first light-guiding plate having a first light incidence surface and a first light emission enhancement surface provided with a first pattern; and a second light-guiding plate having a second light incidence surface and a second light emission enhancement surface provided with a second pattern. The first pattern is a pattern constituted by a plurality of first punctiform sections of which an arrangement pitch changes to cause density of the first punctiform sections to increase as a distance from the first light incidence surface increases, and the second pattern is a pattern constituted by a plurality of second punctiform sections of which an arrangement pitch changes to cause density of the second punctiform sections to increase as a distance from the second light incidence surface increases, and when viewed from the light emission direction, regions provided with the first pattern and the second pattern partially overlap, and directions in which densities of the first pattern and the second pattern increase are opposite to each other.