Spread Illuminator Housing Frame Elastic Joints
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Solution Overview
Problem
Conventional side light type spread illuminating apparatuses for large LCD devices face challenges in efficiently utilizing light from point light sources, leading to heat deformation and variations in brightness due to direct contact between LEDs and light conductor plates, and difficulties in maintaining consistent optical coupling.
Innovation Solution
A spread illuminating apparatus with a housing frame structure that maintains a predetermined gap between the point light source and the light conductor plate using elastic members, preventing direct heat transfer and ensuring consistent optical coupling by using a double-structured housing frame with inner and outer frame members and elastic joints to stabilize the light conductor plate's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the LED is disposed tightly close to the light conductor plate to improve light introduction efficiency, then light utilization efficiency is improved, but heat deformation of the light inlet surface occurs
Solution Approach 1:
The patent introduces a resin layer as an intermediary substance between the LED and the light conductor plate. This resin layer has high light transmittance to maintain optical coupling efficiency while having low thermal conductivity to prevent heat transfer to the light inlet surface, thereby resolving the contradiction between light utilization and heat deformation prevention
Solution Approach 2:
The patent changes the thermal parameters of the interface between LED and light conductor plate by using a resin layer with specific thermal and optical properties. The resin layer has high light transmittance (maintaining optical coupling) but low thermal conductivity (blocking heat transfer), thus changing the thermal parameter profile while maintaining optical performance
2Object-affected harmful factors
If the LED and light conductor plate are separated by an air gap to prevent heat transfer, then heat deformation is prevented, but optical coupling becomes unstable due to gap variation
Solution Approach 1:
The resin layer serves as a mediator that fills the gap between LED and light conductor plate, ensuring consistent optical coupling while preventing direct heat transfer. The resin maintains a stable refractive index and physical presence to ensure reliable optical coupling unlike variable air gaps
Solution Approach 2:
The patent uses a thin resin layer that can conform to the interface between LED and light conductor plate, maintaining consistent optical contact while providing thermal isolation. The thin film structure ensures stable optical coupling without the variability of air gaps
3Temperature
If the LED makes contact with the metallic chassis for heat radiation, then radiation performance is enhanced, but the light inlet surface still suffers from heat deformation
Solution Approach 1:
The resin layer acts as a thermal barrier between the LED and light conductor plate, allowing the LED to contact the metallic chassis for heat radiation while preventing heat from reaching the light inlet surface. The resin's low thermal conductivity blocks heat transfer path to the sensitive light inlet area
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 solution effectively suppresses heat transfer from the point light source to the light conductor plate, maintains consistent optical coupling, and minimizes variations in brightness and gap dimensions, even with temperature and humidity changes, thus enhancing the reliability and efficiency of the illuminating apparatus.
Implementation Method 1
each of the two first joint means (31, 32) includes an elastic member (25, 26) to press the light conductor plate (14) toward the interface surfaces (17) of the subassembly (20)
Implementation Method 2
light emitted from the LEDs (1, 2) to be effectively introduced into the light conductor plate GLB
Data Source
AI summary
In a spread illuminating apparatus, at least one point light source is disposed at an end wall of an outer frame member, and a subassembly is constituted by a light conductor plate and an inner frame member via first joint means. The subassembly has interface surfaces to make contact with the end wall of the outer frame member, a light inlet face of the light conductor plate is positioned to recede from the interface surface by a predetermined dimension, the first joint means each includes a elastic member to press the light conductor plate toward the interface surfaces, and the subassembly is jointed to the outer frame member via second joint means each constituted by an elastic member to press the interface surfaces toward the end wall of the outer frame member.