Graphene Thermal Film for LCD Light Valve Heat Dissipation
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Solution Overview
Problem
Conventional LCD projectors face challenges in heat dissipation due to the overlap of heat dissipation and light transmission functions in light valves, leading to inefficient cooling and limitations in adapting to higher brightness requirements, as traditional methods like air cooling and crystal glass offer insufficient thermal conductivity.
Innovation Solution
A self-conducting light valve module utilizing ultra-high thermal conductivity graphene films to quickly dissipate heat from the LCD light valve, combined with a heat diffusion device, enhances thermal management and mechanical strength, allowing for improved heat dissipation and temperature equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If forced air cooling is used to dissipate heat from the light valve, then heat dissipation function is provided, but heat transfer efficiency is low due to low heat transfer coefficient of air cooling
Solution Approach 1:
A transparent thermal conductive film is introduced as an intermediary substance between the light valve and the cooling system. This film has high thermal conductivity to efficiently transfer heat from the light valve surface, solving the low heat transfer coefficient problem of air cooling while maintaining system transparency and simplicity
Solution Approach 2:
The patent uses composite material structure combining transparent thermal conductive film with cooling channels. This composite approach achieves both high heat dissipation efficiency and optical transparency, resolving the contradiction between effective heat removal and system simplicity
2Loss of energy
If opaque thermally conductive substance is used to conduct heat away by directly contacting the transparent surface of the light valve, then heat dissipation is improved, but light transmission function is blocked
Solution Approach 1:
The thermal conductive film is applied locally on the light valve surface rather than using opaque materials throughout. This localized application maintains the overall transparency of the light valve while providing effective thermal conduction at the critical heat generation areas
Solution Approach 2:
The patent changes the optical parameter (transparency) of the thermal conductive material from opaque to transparent. This parameter change allows the material to simultaneously perform both heat conduction and light transmission functions, resolving the fundamental contradiction between these two requirements
3Illumination intensity
If stronger light irradiation is applied to increase output brightness, then projector brightness is improved, but heat generation by the light valve increases
Solution Approach 1:
The patent converts the harmful effect of light absorption (heat generation) into a manageable thermal conduction problem. By introducing the transparent thermal conductive film, the heat that would otherwise damage the light valve is efficiently conducted away, enabling stronger light irradiation to be used safely to achieve higher brightness
4Reliability
If crystal glass is used to conduct heat by directly contacting the transparent surface of the light valve, then local high-heat spot damage is prevented, but heat dissipation efficiency is limited due to low thermal conductivity coefficient
Solution Approach 1:
The patent changes the thermal conductivity parameter of the contact material from low (crystal glass) to high (transparent thermal conductive film). This parameter improvement maintains the protective function against local heat spots while significantly enhancing overall heat dissipation efficiency
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 effectively extends the service life of the light valve, enables it to handle stronger light irradiation, enhances image brightness and color uniformity, and increases user satisfaction by achieving superior heat dissipation compared to traditional methods.
Implementation Method 1
The present invention takes advantages of an ultra-high thermal conductivity coefficient of a graphene thermal film in the horizontal (in-plane) direction (which is up to 5000 W/m·k), to quickly conduct heat of an LCD (liquid-crystal display) light valve
Data Source
AI summary
A self-conducting light valve module includes: a first transparent graphene thermal conductive film, a panel frame, an LCD light valve, and a second transparent graphene thermal conductive film; wherein the panel frame has a first plane and a second plane at two ends, respectively; a rectangular through hole is drilled at a center of the panel frame, and the LCD light valve is installed in the rectangular through hole; the first transparent graphene thermally conductive film is attached to the first plane and the incident surface of the LCD light valve; and the second transparent graphene thermally conductive film is attached to the second plane and the emergent surface of the LCD light valve. A light valve heat dissipation device includes: a heat diffusion device installed on an external peripheral wall of the self-conducting light valve module.