LED Illumination Device Slide Mechanism for Safe Light Source Exchange
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Solution Overview
Problem
The existing illumination devices for liquid crystal display devices face challenges in exchanging LED light sources without causing damage, such as cracking of solder or unsticking of the LED chip from the printed substrate, due to contact with the light guide plate during sliding operations.
Innovation Solution
An illumination device design featuring a light source unit with point-like LEDs, a light source holding member, and a spacer that ensures a gap between the light guide plate and the LEDs during insertion, using a slide mechanism to prevent interference and employing an elastic spacer for stable positioning and adjustment, along with a pressing member to maintain optimal clearance and luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slide mechanism is used to exchange the light source unit, then the ease of operation is improved, but the reliability deteriorates due to potential contact between the LED and light guide plate causing cracking or unsticking
Solution Approach 1:
A pressing member is introduced as an intermediary component between the light source unit and the housing. This pressing member applies pressure to push the light source unit against the light guide plate during operation, but can be removed during exchange to prevent damage while maintaining ease of operation through the slide mechanism
2Illumination intensity
If the light source unit is pressed against the light guide plate, then the illumination intensity is improved, but the strength deteriorates due to risk of damage during sliding insertion
Solution Approach 1:
The system transitions from a static fixed position to a dynamic adjustable position. The light source unit can slide along the edge face of the light guide plate to adjust the pressing degree, allowing optimization of illumination intensity while avoiding excessive force that could cause damage during insertion
3Ease of operation
If a slide mechanism allows movement of the light source unit, then the ease of operation is improved, but the stability deteriorates due to potential misalignment or loose fitting
Solution Approach 1:
The pressing degree parameter is adjusted by sliding the light source unit along the edge face of the light guide plate. This allows optimization of the fit between components, ensuring stable positioning during operation while maintaining ease of exchange by removing the pressing member during insertion
Data Source
AI summary
There is provided an illumination device equipped with a light guide plate having a light emission face and a light incident face, a printed substrate having a first plane and a second plane opposite to the first plane, a plurality of point like light sources for supplying light to the light guide plate, a housing disposed at a opposite side of the light emission face of the light guide plate, and a light source holding member for holding the printed substrate. The light source holding member has a bend portion, and a edge of the bend portion is inserted in between the light guide plate and the housing.