Surface Light Source Gap Shielding Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional surface light source apparatuses experience uneven light emission due to eye-shaped high-brightness regions caused by light leakage from gaps between the light guide plate and the flexible printed board or light blocking member, which impairs the evenness of the light emission surface.
Innovation Solution
A surface light source apparatus incorporating a point light source, a light guide plate, and a light blocking member with a gap shielding member that projects towards the light outgoing plane, where the gap shielding member is made of a material with light blocking properties to prevent light leakage and improve evenness, and optionally includes a light absorbing layer or prism pattern to further enhance light absorption and diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light source is disposed with the front face of the transparent resin equal to the thickness of the light guide plate to achieve low profile and enhance light use efficiency, then the profile is reduced and light use efficiency is enhanced, but a gap is generated between the light source and the light incident plane of the light guide plate causing light leakage and eye-shaped high-brightness regions
Solution Approach 1:
A light blocking member is introduced as an intermediary component between the light source and the light guide plate. This member has a light blocking surface that faces the light incident plane, preventing light from leaking through the gap while maintaining the compact profile design.
Solution Approach 2:
The light blocking member extends in the thickness direction of the light guide plate, utilizing the third dimension to block light leakage paths without increasing the overall profile height significantly. This dimensional approach allows effective light blocking while maintaining compactness.
2Object-generated harmful factors
If a light blocking member is introduced to cover the gap and prevent light leakage, then light leakage is prevented and evenness is improved, but the device complexity increases
Solution Approach 1:
The light blocking member is implemented as a thin film or sheet structure that can be easily integrated into the existing device architecture. This thin-film approach blocks light effectively while adding minimal structural complexity and maintaining device simplicity.
3Object-generated harmful factors
If the opening of the rim sheet is decreased to extend the edge on the inner peripheral side to hide the eye-shaped high-brightness region, then the high-brightness region is hidden, but the effective region of the surface light source apparatus becomes small
Solution Approach 1:
The light blocking member serves as an intermediary that directly addresses the light leakage problem at its source, eliminating the need to reduce the rim sheet opening. This allows the rim sheet to maintain its original larger opening and preserve the effective display region.
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 solution effectively prevents light leakage and enhances the uniformity of the light emission surface by closing the gap between the light blocking member and the light guide plate, reducing the occurrence of eye-shaped high-brightness regions and improving light use efficiency.
Implementation Method 1
a light blocking member which covers parts of the point light source and a light outgoing plane of the light guide plate
Implementation Method 2
at least a portion facing the light outgoing plane in the gap shielding member is made of a material having a light blocking property
Data Source
AI summary
A surface light source apparatus including a point light source, a light guide plate which spreads light introduced from the point light source into a planar shape to output the light from a light outgoing plane, and a light blocking member which covers parts of the point light source and the light outgoing plane of the light guide plate. A gap shielding member is projected toward the light outgoing plane from a surface on a side facing the light outgoing plane of the light blocking member. At least a portion facing the light outgoing plane in the gap shielding member is made of a material having a light blocking property.