Projector Polarization Plate Cooling via Liquid Refrigerant Flow Channels
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Solution Overview
Problem
Existing projectors face challenges in effectively cooling the polarization plate on the incident side of the liquid crystal panel, which is crucial for high-luminance projection images, as the existing heat radiation methods are inadequate.
Innovation Solution
A projector configuration that includes a cooling device with a liquid refrigerant circulation system, where the incident side polarization plate is attached to the liquid crystal panel using an attachment member, and a frame with flow channels for the refrigerant to efficiently transfer heat away from the polarization plate, combining with a light transmissive substrate for additional heat radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high-luminance light source device is adopted to achieve high-luminance projection images, then the brightness and luminance of the projection image are improved, but the heat generation increases and the existing cooling configuration becomes insufficient
Solution Approach 1:
The cooling system is segmented into multiple independent cooling paths: one path cools the liquid crystal panel through integrated flow channels, while separate paths cool the incident side and emission side polarization plates through attached cooling plates. This segmentation allows each component to be optimized independently for heat dissipation.
Solution Approach 2:
Cooling plates are introduced as intermediary heat transfer components between the polarization plates and the cooling refrigerant. These cooling plates provide a large surface area for heat exchange, efficiently transferring heat from the polarization plates to the refrigerant flowing through the flow channels.
2Device complexity
If the existing cooling configuration is used, then the structure is simple, but the polarization plate on the incident side cannot be effectively cooled
Solution Approach 1:
The cooling plates for the polarization plates are merged with the frame structure that holds the liquid crystal panel. The frame integrates the flow channels and provides structural support, while the cooling plates are attached to both the frame and the polarization plates, creating a unified cooling assembly that cools multiple components simultaneously.
3Device complexity
If only the emission side polarization plate is cooled, then the cooling structure is simple, but the incident side polarization plate generates excessive heat affecting reliability
Solution Approach 1:
Different cooling solutions are applied to different locations: the liquid crystal panel uses integrated flow channels within its structure, while the incident side and emission side polarization plates use separate cooling plates with flow channels. This local quality approach optimizes heat dissipation for each specific component based on its thermal characteristics and position.
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 efficient cooling of the polarization plate on the incident side, preventing reliability issues and maintaining high-luminance projection capabilities by effectively dissipating heat through both liquid and gaseous refrigerants.
Implementation Method 1
a first circulation device adapted to make a liquid refrigerant flow through the liquid crystal panel
Implementation Method 2
the liquid refrigerant can be made to flow in the transmission area of the heat from the support member to the frame
Implementation Method 3
a light transmissive substrate located on a light incidence side with respect to the polarization plate main body, and having contact with the polarization plate main body... another part of the heat generated in the polarization plate main body is transferred to the support member from the polarization plate main body... the heat having been transferred to the support member is transferred to the frame
Data Source
AI summary
Projector including a light source device, an image forming device, and a cooling device, image forming device includes a light modulation device having a liquid crystal panel, incident side polarization plate and attachment member, a liquid crystal panel includes a panel main body having a modulation area having a rectangular shape, and a frame, cooling device includes a first circulation device that makes a liquid refrigerant flow through a first flow channel included in frame along one of long sides and short sides in modulation area, the incident side polarization plate has a polarization plate main body and a light transmissive substrate, attachment member includes clamp-holding members adapted to clamp-hold the incident side polarization plate, and a support member, clamp-holding members are disposed at positions corresponding respectively to the long sides, and the support member is connected to the areas respectively along the short sides on the frame surface.