Light Guide Plate Recesses for Thin Light Emitting Modules
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Solution Overview
Problem
Existing light emitting modules face challenges in achieving adequate thinning due to the required distance between the mounting substrate and diffusion plate, which limits their compactness.
Innovation Solution
A light emitting module configuration that includes a light guide plate with recesses on its surface, where light emitting elements are positioned such that their side surfaces are within these recesses, allowing for effective lateral spreading of light and reducing module thickness, along with a sealing member to cover the elements and guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the mounting substrate and diffusion plate is increased to accommodate lens members, then the light emitting elements can be properly sealed and positioned, but the overall thickness of the light source device increases
Solution Approach 1:
The patent transitions from a conventional planar arrangement where lens members are positioned above the mounting substrate to a vertical arrangement where recesses are formed in the light guide plate. This dimensional reconfiguration allows light emitting elements to be positioned at the same level as the light guide plate surface, eliminating the need for additional vertical space for lens members while maintaining proper sealing and positioning.
Solution Approach 2:
The patent embeds light emitting elements within recesses formed in the light guide plate, creating a nested structure where the elements are positioned within the thickness of the light guide plate itself rather than requiring separate mounting substrate and lens member layers. This nesting approach consolidates multiple functional layers into a single integrated structure.
2Length of stationary object
If light emitting elements are positioned closer to the light guide plate surface, then the module thickness is reduced, but luminance unevenness across the light guide plate surface increases
Solution Approach 1:
The patent creates localized recess structures at specific positions within the light guide plate where light emitting elements are positioned. These local modifications to the light guide plate geometry enable precise control of light emission characteristics at each element position while maintaining overall luminance uniformity across the entire plate surface.
Solution Approach 2:
The patent employs curved or rounded bottom surfaces in the recesses where light emitting elements are positioned. This curvature design helps to evenly distribute light extraction from the elements into the light guide plate, reducing hot spots and improving overall luminance uniformity while maintaining the thinned profile.
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 enables a thinner light emitting module with reduced luminance unevenness across the light guide plate's surface, enhancing the module's compactness and performance.
Implementation Method 1
a wavelength conversion member covering the main light emitting surface and the side surface of the light emitting element
Implementation Method 2
enables a thinner light emitting module with reduced luminance unevenness across the light guide plate's surface
Data Source
AI summary
Provided is a light emitting module, including: a light guide plate having a first main surface and a second main surface opposite to the first main surface; a plurality of light source members disposed on a second main surface side, each of the light source members including a light emitting element having a main light emitting surface, an electrode formation surface located opposite to the main light emitting surface, and a side surface between the main light emitting surface and the electrode formation surface, and a wavelength conversion member covering the main light emitting surface and the side surface of the light emitting element; and a sealing member covering the plurality of light source members and the second main surface of the light guide plate. The light guide plate has a plurality of first recesses located at the second main surface, and each of the plurality of light source members is disposed such that at least a part of the side surface of the light emitting element is located in the first recess in a cross-sectional view.