Planar Light Source Frame Protrusion Design for Uniform Illumination
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Solution Overview
Problem
Existing planar light source devices that use point light sources suffer from reduced light usage efficiency due to light absorption members being arranged at positions causing leak light, leading to non-uniform illumination and brightness differences at the end portions.
Innovation Solution
A planar light source device design featuring a light guide plate and a frame with protrusions of varying widths parallel to the emitting surface, where the protrusions corresponding to point light sources are wider than those between them, to optimize light distribution and absorption, preventing brightness differences and enhancing light usage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light absorption members are arranged at positions corresponding to point light sources to prevent brightness differences, then uniform luminance is achieved, but light usage efficiency is reduced
Solution Approach 1:
The frame is designed with protrusions having different widths at different locations: wider protrusions at positions corresponding to point light sources to absorb excess light and prevent brightness differences, and narrower protrusions at positions between light sources to allow more light transmission. This local differentiation resolves the contradiction by applying light absorption only where needed rather than uniformly across the entire frame.
Solution Approach 2:
The frame is segmented into multiple protrusions with varying widths rather than using a single uniform absorption structure. Each protrusion is positioned and sized specifically for its location - wider ones near light sources for absorption, narrower ones between sources for transmission - creating a segmented approach to light management that balances uniformity and efficiency.
2Reliability
If light absorption members are arranged in areas causing leak light to prevent light leakage, then light control is improved, but light usage efficiency is lowered
Solution Approach 1:
The frame structure implements local quality control by providing protrusions with different widths at different locations. Wider protrusions are positioned where light absorption is needed for control, while narrower protrusions are positioned where light transmission is desired, achieving effective light control only where necessary rather than uniform absorption throughout.
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 ensures uniform luminance distribution and high light usage efficiency by adjusting light absorption and emission patterns, preventing non-uniformity and leveraging the protrusions to direct light effectively from point light sources.
Implementation Method 1
a light guide plate, wherein light emitted from the point light sources enters into the light guide plate from an incident surface, and wherein the light spread out into a planar shape and the light guide plate emits the light from an emitting surface
Implementation Method 2
the frame has a protrusion that is provided on a light source side of a peripheral end portion of the emitting surface of the light guide plate... a width of a portion of the protrusion, which corresponds to the position where the point of the point light source is arranged, is wider than a width of a portion of the protrusion, which corresponds to a position between the point light sources
Data Source
AI summary
A planar light source device comprising: a plurality of point light; a light guide plate including an incident surface, wherein the light spread out into a planar shape and the light guide plate emits the light from an emitting surface; and a frame including an opening, wherein the frame has a protrusion that is provided on a light source side of a peripheral end portion of the emitting surface of the light guide plate, wherein the point light sources are arranged at the light source side, wherein the protrusion has difference widths parallel to the emitting surface, and wherein a width of a portion of the protrusion, which corresponds to the position where the point of the point light source is arranged, is wider than a width of a portion of the protrusion, which corresponds to a position between the point light sources.