Light Source Unit With Integrated Locating Components
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in easily replacing light source units with LEDs, leading to difficulties in maintaining light incident efficiency and increasing manufacturing costs due to complex assembly processes and the need for additional components.
Innovation Solution
A light source unit design featuring a substrate with LEDs and integrated locating components, such as fittings or protruding portions, that allow for precise positioning and easy replacement, reducing the need for separate assembly steps and additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the chassis, back case, and circuit substrate are fixed to each other with double-faced tapes to enhance light incident efficiency, then luminance is enhanced, but it becomes difficult to replace the light source unit
Solution Approach 1:
The patent divides the backlight unit into separable modules: the light source substrate with LEDs is made as an independent replaceable unit from the chassis and back case. This segmentation allows the light source unit to be replaced without damaging other components, while still achieving strong adhesion through the double-faced tapes during normal operation.
2Manufacturing precision
If a partially-thinned reflective sheet is inserted to reduce shift amount between LEDs and light guide plate, then light incident efficiency is enhanced, but the structure becomes more complex
Solution Approach 1:
The patent combines the reflective sheet with the light source substrate by forming the reflective sheet as an integral part of the substrate structure. This merging eliminates the need for separate insertion of partially-thinned reflective sheets, simplifying the overall structure while maintaining the positional accuracy needed for efficient light incident.
3Ease of repair
If through-holes and substrate holding members are added to enable easy replacement of light source substrate, then replaceability is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent employs elastic substrate holding members that utilize elastic force to dynamically hold the light source substrate in place. This dynamic holding mechanism allows for easy insertion and removal of the substrate without requiring complex through-holes or rigid fixing structures, achieving replaceability while maintaining relatively simple device structure.
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 enables easy replacement and assembly of the light source unit, enhances light incident efficiency, and reduces manufacturing costs by simplifying the assembly process and improving positional accuracy of the LEDs and light guide plate.
Implementation Method 1
a light guide unit including a light guide plate which propagates light from the LEDs while reflecting the same with inner surfaces thereof
Implementation Method 2
the chassis, the back case, and the circuit substrate are fixed to each other with double-faced tapes
Implementation Method 3
the light source substrate and a side surface portion of the lower case can be held in a state of being sandwiched by an elastic force of the substrate holding member
Data Source
AI summary
Provided is a light source unit in which locating components are mounted on a substrate together with LEDs forming a light emitting portion, and with this, the light source unit can be more easily replaced, and the number of components can be reduced.