Planar Light Source With Nested Light Adjustment Members
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Solution Overview
Problem
Existing planar light sources experience luminance unevenness due to variations in light transmission and reflection, leading to inconsistent brightness across the light-emitting surface.
Innovation Solution
A planar light source design incorporating a light guide member, a light source with a light-emitting element, a first light-transmissive member, and a second light adjustment member, where the first light-transmissive member has higher transmittance than the second light adjustment member, and both are strategically positioned to control light emission and reflection, reducing luminance unevenness by optimizing light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light adjustment members are added to control light distribution, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The first light adjustment member is disposed inside the first hole of the light guide member, and the second light adjustment member is disposed on the first light-transmissive member, creating a nested structure where multiple light control components are integrated within each other. This nesting approach allows multiple light adjustment functions to be combined in a compact arrangement, improving luminance uniformity while minimizing the increase in overall device complexity and footprint.
Solution Approach 2:
The first light-transmissive member acts as an intermediary component between the light source and the second light adjustment member. It has higher transmittance than the light adjustment members, allowing it to efficiently transmit light while the light adjustment members selectively control light distribution. This intermediary structure enables precise light control without requiring the light-transmissive member itself to have complex light-adjusting properties.
2Illumination intensity
If multiple light adjustment members with different transmittances are used, then light distribution control is improved, but manufacturing complexity increases
Solution Approach 1:
The light adjustment members are designed with spatially varying transmittance properties - the first light adjustment member has lower transmittance for controlling light directly above the light source, while the second light adjustment member has higher transmittance for adjusting light in peripheral regions. This local quality differentiation allows each component to perform its specific light control function optimally, achieving superior light distribution control while maintaining manageable manufacturing complexity through specialized rather than universally complex components.
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 effectively reduces luminance unevenness by managing light transmission and reflection, ensuring a more uniform brightness across the light-emitting surface, thereby enhancing the overall performance of the planar light source.
Implementation Method 1
a first light adjustment member having, on an upper surface, light reflectivity and being light-transmissive to light emitted from the light-emitting element
Implementation Method 2
being light-transmissive to light emitted from the light-emitting element
Implementation Method 3
A transmittance of the first light-transmissive member is higher than a transmittance of the first light adjustment member and a transmittance of the second light adjustment member with respect to light emitted from the light source
Implementation Method 4
a second light adjustment member being disposed on the first light-transmissive member, and having light reflectivity and being light-transmissive to light emitted from the light source
Implementation Method 5
having light reflectivity and being light-transmissive to light emitted from the light source
Data Source
AI summary
A planar light source includes: a light guide member, a light source including a light-emitting element and a first light adjustment member and being disposed in a first hole of the light guide member, a first light-transmissive member disposed in the first hole between a lateral surface of the light source and the light guide member and on the light source, and a second light adjustment member disposed on the first light-transmissive member. A transmittance of the first light-transmissive member is higher than a transmittance of the first light adjustment member and a transmittance of the second light adjustment member with respect to light emitted from the light source. The first light-transmissive member includes a first light-transmissive portion 1ocated between the first light adjustment member and the second light adjustment member, and a second light-transmissive portion 1ocated between the lateral surface of the light source and the light guide member.