Reflective Member Slits for Thermal Contraction in Planar Light Sources
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Solution Overview
Problem
The technical problem addressed in this patent is the thermal contraction of a reflective member in a planar light source, which can lead to positional deviations of openings and potential contact with light sources, resulting in optical issues such as luminance and chromaticity nonuniformity.
Innovation Solution
The solution involves a reflective member with slits that intersect virtual straight lines at prescribed positions, allowing the reflective member to expand and contract without significant positional deviation of openings, thus reducing optical influences like luminance and chromaticity nonuniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the reflective member is made as a continuous solid structure, then the structural strength is improved, but thermal contraction causes positional deviation of openings leading to optical nonuniformity
Solution Approach 1:
The reflective member is divided into multiple independent reflective units separated by slits. Each unit can move independently during thermal expansion/contraction without causing positional deviation of openings in other units, thus maintaining optical uniformity while preserving overall structural strength through the distributed unit structure.
Solution Approach 2:
Slits are pre-formed in the reflective member at positions that anticipate thermal expansion/contraction movements. These slits allow the reflective units to move along predetermined paths during temperature changes, preventing unintended positional deviations of openings before they occur.
2Reliability
If the reflective member includes slits to accommodate thermal expansion, then thermal contraction effects are reduced, but the structural integrity may be compromised
Solution Approach 1:
The slits are strategically positioned in regions where they provide maximum thermal expansion accommodation benefit while minimizing impact on structural integrity. The reflective units are designed with specific aspect ratios and spacing that optimize the balance between allowing thermal movement and maintaining overall structural strength.
3Ease of manufacture
If the reflective member uses a simple rectangular structure, then the ease of manufacture is improved, but thermal contraction causes contact between openings and light sources
Solution Approach 1:
The simple rectangular structure is segmented into multiple reflective units by introducing slits. This segmentation maintains manufacturing simplicity through standard fabrication processes while preventing thermal contraction-induced contact between openings and light sources by allowing independent movement of each unit.
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 approach effectively reduces the impact of thermal contraction on the reflective member, minimizing optical nonuniformities and maintaining the performance and efficiency of the planar light source.
Implementation Method 1
a reflective member configured to reflect light from the light sources
Implementation Method 2
the reflective member can have a plurality of perforation apertures across the reflector sheet, and the perforation apertures can serve to provide expandable zones
Implementation Method 3
One of the objects of this disclosure is to reduce thermal contraction of a reflective member in a planar light source
Data Source
AI summary
A planar light source includes a reflective member. The reflective member defines at least one slit including at least one first slit arranged in a first region extending in a first direction and intersecting a first virtual straight line at a prescribed position in the first region. The first virtual straight line is parallel to the first direction.