LCD Thermal Management via Chassis Heat Dissipation
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Solution Overview
Problem
Existing liquid crystal display units with edge light type backlights face challenges in efficiently cooling LED light sources and maintaining optical properties, particularly in large-sized displays, due to heat-related issues that affect light-emitting efficiency, reliability, and power consumption, as well as degradation of optical guiding boards.
Innovation Solution
A liquid crystal display unit configuration that includes a light source on one end of the panel, an optical guiding board, a chassis member, and a thermal conductor, with a thermal insulation member between the chassis member and the optical guiding board to prevent heat transfer and maintain optical properties, and a reflective thermal insulation member to enhance cooling and light incidence efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cooling structure is added to suppress temperature rise, then the lifetime of the light source and optical properties are improved, but the device complexity increases
Solution Approach 1:
The chassis member is designed to serve dual functions: as a structural support component and as a heat dissipation component. The chassis member is made of heat-resistant material and positioned to receive heat from the light source, eliminating the need for separate cooling structures while maintaining reliability.
Solution Approach 2:
The chassis member performs multiple functions simultaneously: mechanical support for the light source and optical guiding board, heat dissipation through its heat-resistant material properties, and structural framework for the entire display unit. This multi-functionality reduces overall device complexity.
2Productivity
If the light source is positioned close to the optical guiding board to improve light incidence efficiency, then light extraction efficiency is improved, but heat transfer to the optical guiding board increases causing degradation
Solution Approach 1:
The chassis member acts as an intermediary component between the light source and the optical guiding board. It is positioned to receive heat from the light source while being thermally isolated from the optical guiding board, preventing heat transfer to the optical component while maintaining close proximity for efficient light incidence.
Solution Approach 2:
The chassis member is designed with different thermal properties in different regions: the portion near the light source is made of heat-resistant material to absorb and dissipate heat, while the portion near the optical guiding board is thermally isolated to protect the optical properties. This local differentiation of thermal characteristics solves the contradiction.
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 effectively cools the LED light source and inhibits degradation of optical properties, ensuring high optical quality and slimness for large-sized liquid crystal display units by efficiently directing light and managing heat.
Implementation Method 1
a thermal conductor for transferring the heat of the light source to the chassis member
Implementation Method 2
a thermal insulation member between a predetermined region on an end side of the chassis member and the optical guiding board
Implementation Method 3
a reflective thermal insulation member to enhance cooling and light incidence efficiency
Data Source
AI summary
There is provided a slim liquid crystal display unit having a large screen by providing a slim structure capable of sufficiently radiating the heat from a light source. The liquid crystal display unit according to the present invention includes: a liquid crystal panel; an optical guiding board installed on a rear face thereof; a pair of light source-mounted substrate disposed, opposing right and left side faces thereof; a light source mounted on the light source-mounted substrate; a metal frame connected on the opposite side to the optical guiding board of the light source-mounted substrate; a chassis member for supporting the optical guiding board and a reflection sheet group; and a thermal diffusion member fixed onto the metal frame along with the chassis member. The chassis member has a stepped portion in the vicinity of the light source. Between the stepped portion and the reflection sheet group, a thermal insulation member is attached.