Lightguide Plate Recesses for Thin LED Backlights
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Solution Overview
Problem
Existing light emitting devices with multiple LEDs struggle to reduce thickness while maintaining uniform luminance, which is essential for miniaturizing apparatuses that use these devices as backlights.
Innovation Solution
A light emitting device design featuring a lightguide plate with recesses on both surfaces, a light-reflective resin layer on the bottom of each recess, and wavelength conversion members covering the lateral surfaces of LEDs, which diffuses light and reduces thickness while suppressing luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If LED elements are encapsulated in glass or resin with phosphor dispersed therein and arranged on a substrate, then light emission function is achieved, but device thickness cannot be reduced further
Solution Approach 1:
The invention divides the light guide plate into multiple regions with different thicknesses by forming recesses at specific positions. This segmentation allows different portions of the plate to serve different functions: thicker regions for light diffusion and thinner regions for overall thickness reduction, thereby resolving the contradiction between thickness reduction and luminance uniformity.
Solution Approach 2:
The invention applies local quality by creating recesses with light-reflective resin layers at specific locations where LEDs are positioned, while maintaining different thickness characteristics in different regions. This localized modification enables precise control over light distribution without requiring uniform thickness changes across the entire plate, achieving both thickness reduction and luminance uniformity.
2Length of moving object
If recesses are provided in the light guide plate and LED elements are arranged in the recesses, then device thickness is reduced, but luminance unevenness increases
Solution Approach 1:
The invention converts the potential harm of recesses causing luminance unevenness into a benefit by filling the recesses with light-reflective resin layers. The recesses naturally create thickness variation for thinning, while the reflective resin layers compensate for the resulting luminance defects by reflecting light back into the light guide plate, thereby converting the harmful effect into a beneficial dual-function structure.
Solution Approach 2:
The invention uses composite materials by combining the light guide plate material with light-reflective resin layers in the recesses. This composite structure allows the recesses to serve dual purposes: reducing overall thickness while the reflective resin material compensates for light distribution issues, thereby achieving both thickness reduction and luminance uniformity simultaneously.
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 design achieves a thinner light emitting device with uniform light distribution and reduced luminance variations across the surface, enhancing the miniaturization of backlight systems.
Implementation Method 1
a plurality of wavelength conversion members, wherein: the upper surface of each light emitting element is attached to the light-reflective resin layer; and each of the plurality of wavelength conversion members covers the lateral surface of the light emitting element in the first recess
Implementation Method 2
a light-reflective resin layer that is located on a bottom portion of each first recess
Implementation Method 3
which diffuses light and reduces thickness while suppressing luminance unevenness
Data Source
AI summary
A light emitting device includes: a lightguide plate including a first surface on which a plurality of first recesses are provided; a light-reflective resin layer located on a bottom portion of each first recess; a plurality of light emitting elements each having an upper surface and a lateral surface, wherein each one of the plurality of light emitting elements is arranged in a corresponding one of the plurality of first recesses; and a plurality of wavelength conversion members, wherein: the upper surface of each light emitting element is attached to the light-reflective resin layer; and each of the plurality of wavelength conversion members covers the lateral surface of the light emitting element in the first recess.