Light Guide Plate Recess for Thin Planar Light Source
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Solution Overview
Problem
There is a demand for a thinner planar light source for liquid crystal displays, as existing light emitting modules are not optimized for reduced thickness while maintaining even luminance and color reproduction.
Innovation Solution
A light emitting module design featuring a light guide plate with recesses for fluorescent material layers and a light emitting element, where the fluorescent material layers are strategically positioned on the second main surface to enhance light distribution and minimize color unevenness, and an optical function part is used to refract light for even emission from the first main surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the planar light source thickness is reduced, then the display device can be made thinner, but the luminance uniformity and color reproduction may deteriorate
Solution Approach 1:
The light guide plate is divided into multiple functional layers: a first fluorescent material layer in the recess and a second fluorescent material layer on the second main surface. This segmentation allows each layer to perform specific functions - the first layer for light extraction and the second layer for color conversion - thereby maintaining luminance uniformity and color reproduction in a thin configuration.
Solution Approach 2:
The patent utilizes the recess structure to position fluorescent materials in different spatial dimensions. By placing the first fluorescent material layer in the recess and the second fluorescent material layer on the surface, the design creates a three-dimensional light distribution pattern that ensures uniform luminance across the light emitting surface despite reduced thickness.
2Stability of the object's composition
If fluorescent material layers are added to improve color reproduction, then color uniformity improves, but the device complexity and thickness increase
Solution Approach 1:
The patent merges multiple functions into the fluorescent material layers: the first fluorescent material layer performs both light extraction and color conversion, while the second fluorescent material layer provides additional color enhancement. This merging of functions reduces the need for separate components, thereby managing device complexity while achieving superior color uniformity.
Solution Approach 2:
Different fluorescent material layers are positioned at specific locations with distinct functions. The first fluorescent material layer in the recess handles light extraction, while the second fluorescent material layer on the second main surface handles color conversion. This local differentiation of quality and function optimizes color uniformity without unnecessarily increasing overall device complexity.
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 module achieves reduced thickness and minimizes color unevenness in the light emitting surface, ensuring even luminance and color reproduction, suitable for use as a backlight in liquid crystal displays.
Implementation Method 1
a first fluorescent material layer provided in the recess; a light emitting element provided at the first fluorescent material layer on the second main surface side; and a second fluorescent material layer provided at the second main surface
Implementation Method 2
an optical function part is used to refract light for even emission from the first main surface
Data Source
AI summary
A light emitting module and a planar light source reduced in thickness are provided. A light emitting module includes: a light guide plate including a first main surface serving as a light emitting surface, a second main surface provided on a side opposite to the first main surface, and a recess provided at the second main surface; a first fluorescent material layer provided in the recess; a light emitting element provided at the first fluorescent material layer on the second main surface side; and a second fluorescent material layer provided at the second main surface.