Backlight Air Duct for LCD Heat Dissipation
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Solution Overview
Problem
In large-sized liquid crystal display devices with direct-type backlights, heat dissipation is non-uniform, leading to temperature distribution issues that existing solutions fail to adequately address, affecting luminance and efficiency.
Innovation Solution
The implementation of an air duct system between the reflector and frame in the backlight, with varying widths and strategically placed ventilation holes, combined with forced ventilation using a rotary fan, to control air-cooling distribution and improve heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-type backlight with cold cathode fluorescent lamps is used in a large-sized liquid crystal display device, then the luminance can be maintained, but heat dissipation becomes non-uniform causing temperature distribution issues that reduce luminous efficiency
Solution Approach 1:
The air duct is divided into multiple regions with different cross-sectional areas, creating segmented cooling channels that target different thermal zones. The first air duct has a larger cross-sectional area for regions requiring more cooling, while the second air duct has a smaller area for regions needing less cooling, enabling non-uniform heat dissipation matching the temperature distribution
Solution Approach 2:
Different parts of the air duct system are designed with different properties to match local cooling requirements. The varying cross-sectional areas of the air ducts provide localized cooling capacity according to the temperature distribution, with larger areas in high-temperature regions and smaller areas in lower-temperature regions
2Loss of energy
If existing heat dissipation structures are used, then the backlight can operate, but the temperature distribution is not uniform affecting the luminous efficiency of the light sources
Solution Approach 1:
The air duct system is designed to dynamically adapt to temperature distribution through forced air circulation. A fan drives air flow through the ducts, creating an active cooling system that can respond to thermal conditions and maintain optimal temperature uniformity across the backlight panel
Solution Approach 2:
The invention uses air as a cooling medium circulated through specifically designed air ducts. The pneumatic system, driven by a fan, transports cool air through the ducts to heat-generating regions and removes hot air, enabling controlled heat dissipation that improves temperature uniformity and luminous efficiency
3Temperature
If the air duct cross-sectional area is increased to improve cooling, then heat dissipation is enhanced, but the structure becomes more complex and space is consumed
Solution Approach 1:
The air duct system serves multiple functions: it provides thermal insulation for the liquid crystal panel, acts as a cooling channel for heat dissipation, and structurally integrates with the backlight housing. This multi-functionality reduces the need for separate components, simplifying the overall structure while maintaining effective heat dissipation
Solution Approach 2:
The air ducts are nested within the existing backlight structure, utilizing the space between the housing and internal components. The ducts are positioned to follow available spatial pathways, allowing complex cooling functions to be achieved without proportionally increasing external dimensions or structural complexity
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 effective control of air-cooling distribution across the liquid crystal display panel, enhancing cooling efficiency and maintaining uniform temperature, thereby improving the luminance and performance of the liquid crystal display device.
Implementation Method 1
air between the reflector (reflective sheet) and the frame heated by heat from a light source rises, thereby being efficiently discharged from the through holes
Implementation Method 2
forced ventilation means mounted on a surface of the frame on the opposite side from the liquid crystal panel so as to cover any one ventilation hole of an air intake hole and an air exhaust hole
Data Source
AI summary
A liquid crystal display device includes: a liquid crystal display panel; and a backlight disposed to face the liquid crystal display panel, the backlight including at least a frame having a bottom surface facing the liquid crystal display panel, a reflector placed on the bottom surface of the frame, and a plurality of light sources disposed on the liquid crystal display panel side of the reflector and supported by the frame, wherein a recess protruding in the opposite direction to the liquid crystal display panel is formed in the bottom surface of the frame, the recess and the reflector constituting an air duct.