Light Source Device Thermal Expansion Management
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Solution Overview
Problem
In edge light type liquid crystal display apparatuses, the increased size of light guide plates due to larger display sizes leads to thermal expansion, necessitating a wider interval between the light source and the light guide plate to maintain luminance, but this increases manufacturing complexity and costs.
Innovation Solution
A heat transfer unit is integrated into the housing body to slidably hold the light guide plate and light source, allowing the light source to move with the plate's expansion and contraction, maintaining the necessary interval without additional components, thus simplifying the configuration and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the interval between the light source and the light guide plate is increased to accommodate thermal expansion, then the light guide plate can thermally expand without deforming, but the incident amount to the incident surface decreases and luminance deteriorates
Solution Approach 1:
The light source is designed to be movable along the incident surface, allowing dynamic adjustment of the interval between the light source and the incident surface. This enables the system to adapt to thermal expansion while maintaining optimal incident amount, resolving the contradiction between accommodating thermal expansion and maintaining luminance.
2Stability of the object's composition
If a separate holding body is provided to maintain the interval between the light guide plate and light source, then the interval can be constantly maintained during thermal expansion, but the configuration becomes complicated and manufacturing costs increase
Solution Approach 1:
The light source is integrated with the housing body, eliminating the need for a separate holding body. The light source can move along the incident surface while being held by the housing body, combining the functions of holding and positioning into a single integrated structure, thereby simplifying the configuration and reducing manufacturing costs.
Solution Approach 2:
The housing body serves multiple functions: it houses the light guide plate, holds the light source, and allows the light source to move along the incident surface. This multi-functionality eliminates the need for separate holding bodies, reducing device complexity while maintaining interval stability during thermal expansion.
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 maintains the interval between the light source and light guide plate during thermal expansion, enhancing luminance while simplifying the device configuration and reducing manufacturing costs.
Implementation Method 1
a heat transfer unit, which holds the light guide plate and the light source and transfers heat emitted from the light source to one surface of the housing body
Implementation Method 2
a light guide plate configured to emit light made incident on one side surface from one surface thereof
Data Source
AI summary
Provided is a light source device which includes a light guide plate for emitting light entered through one side surface from a front surface thereof, a light source disposed opposing the one side surface of the light guide plate, a rear housing body for housing the light guide plate and the light source, and a heat spreader.