Edge-Lit Backlight Fixing Members for Thin Display Illumination
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Solution Overview
Problem
Existing edge-lit backlight devices for liquid crystal displays face challenges in achieving a thinner design while maintaining even illumination, as the fixing members used to maintain the distance between the light source and the light guide plate increase the device's thickness and can lead to display unevenness.
Innovation Solution
The proposed solution involves an illumination device with a light source substrate, a light guide plate, a chassis, a heat dissipating member, and a pair of fixing members with gripping and locking parts that maintain a constant distance between the light source and the light guide plate, preventing thermal expansion-induced movement and ensuring even light distribution without increasing the device's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixing members are provided to maintain the distance between the light source and the light guide plate, then display unevenness is prevented and light utilization efficiency is improved, but the thickness of the backlight device increases
Solution Approach 1:
The invention transitions from a conventional configuration where fixing members extend in the thickness direction to a new configuration where fixing members are arranged in the plane direction (long-side direction) of the light guide plate. This dimensional change allows the fixing members to maintain the required distance between the light source and light guide plate without increasing the device thickness, thus resolving the contradiction between manufacturing precision and device thickness.
Solution Approach 2:
The invention divides the fixing function into multiple discrete fixing members positioned at both ends of the light guide plate in the long-side direction. This segmentation approach allows for precise control of the distance between the light source and light guide plate at critical locations, preventing display unevenness while maintaining a thin overall device profile through optimized spatial arrangement.
2Temperature
If the light guide plate undergoes thermal expansion, then the distance between the light source and light guide plate changes, but display unevenness occurs
Solution Approach 1:
The invention employs fixing members with a body portion that can elastically deform in response to thermal expansion of the light guide plate. This dynamic characteristic allows the fixing members to accommodate dimensional changes of the light guide plate while maintaining constant distance control, preventing display unevenness caused by thermal effects.
Solution Approach 2:
The invention utilizes the elastic deformation capability of the fixing members to adapt to temperature-induced dimensional changes. By allowing controlled parameter changes in the fixing members themselves, the system maintains stable distance control between the light source and light guide plate despite thermal expansion of the light guide plate.
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 configuration allows for a thinner backlight device while preventing display unevenness by keeping the distance between the light guide plate and the light source constant, improving light utilization efficiency and maintaining even illumination.
Implementation Method 1
a heat dissipating member having heat dissipating characteristics and including a bottom part that has a plate shape parallel to the bottom plate of the chassis and that is disposed on the bottom plate
Data Source
AI summary
Provided is a backlight device that includes: LEDs; a LED substrate; a light guide plate having a light-exiting surface, an opposite surface on an opposite side of the light-exiting surface, and a light-receiving face; a chassis; a frame; a heat dissipating member having a bottom part and a raised part; a pair of fixing members, each having a gripping part that extends along a long-side direction of the raised part and that grips each end in the long-side direction of the raised part in a direction perpendicular to a plate surface of the raised part, and a locking part that extends along the long-side direction of the raised part and that is locked to each of side faces adjacent to the light-receiving face of the light guide plate on a side of the light-receiving face. The pair of fixing members keeps a distance between the LED substrate and the light guide plate constant by fixing a distance between the gripping part and the locking part.