Light Modulation Device Incident Side Thermal Management
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Solution Overview
Problem
In projectors with reflective liquid crystal panels, insufficient cooling on the incident side leads to high temperatures, degrading the panel's quality due to the sealed mounting member design which hinders effective heat radiation.
Innovation Solution
A light modulation device with a reflective light modulation element, a holding section, and a light blocking plate with thermal conductivity equal to or higher than the holding section, positioned on the incident side to enhance heat radiation, optionally featuring a concavo-convex pattern or fin-like sections for increased surface area and improved cooling, and a thermally conductive connection to a heat sink for further heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mounting member is designed with a sealed internal space, then the structural integrity and protection of components are improved, but the heat radiation from the reflective liquid crystal panel becomes insufficient
Solution Approach 1:
The mounting member is divided into a sealed main body for structural protection and a separate light blocking plate with high thermal conductivity for heat dissipation. This segmentation allows the sealed structure to maintain its protective function while the detachable light blocking plate provides efficient thermal management on the incident side of the liquid crystal panel.
Solution Approach 2:
The light blocking plate serves as an intermediary component between the sealed mounting member and the liquid crystal panel. It has high thermal conductivity to conduct heat away from the panel while also blocking stray light. The plate is positioned on the incident side to provide both optical and thermal functions without compromising the sealed structure.
2Temperature
If cooling air is fed toward the mounting member, then cooling is provided, but the cooling air cannot effectively reach the incident side of the reflective liquid crystal panel
Solution Approach 1:
The light blocking plate itself serves as a heat dissipation component with high thermal conductivity. It directly contacts the liquid crystal panel and conducts heat away from the incident side without requiring complex cooling air guidance systems. The plate's thermal properties enable it to self-dissipate heat effectively.
Solution Approach 2:
Instead of relying solely on air convection from the rear side, the invention adds heat dissipation in another dimension by placing a high thermal conductivity light blocking plate on the incident side. This provides thermal management in the optical path direction, complementing the rear side cooling and achieving comprehensive temperature control.
3Temperature
If the light blocking plate has high thermal conductivity, then heat radiation is promoted, but the light blocking plate becomes a better heat conduction path
Solution Approach 1:
The light blocking plate is designed with high thermal conductivity specifically at the region contacting the liquid crystal panel to efficiently conduct heat away from the heat-generating area. The plate's thermal properties are optimized locally where needed for heat dissipation while maintaining its light blocking function in other regions.
Solution Approach 2:
The high thermal conductivity of the light blocking plate, which initially appears to potentially transfer heat, is actually beneficial as it efficiently conducts heat away from the liquid crystal panel's incident side. The plate converts the potential harmful heat accumulation into useful heat dissipation, protecting the panel from overheating.
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
Effective cooling of the reflective light modulation element prevents degradation, extending the product life of the light modulation device and projector by ensuring stable operation over a longer period.
Implementation Method 1
a thermal conductivity of the light blocking plate is equal to or higher than a thermal conductivity of the holding section
Implementation Method 2
the radiation of the heat transferred from the reflective light modulation element, to which the light is input, and in which temperature rise is caused, via the holding section from the incident side is promoted
Implementation Method 3
the surface area of the heat radiation surface increases. Thus, since the heat radiation effect of the light blocking plate can be enhanced
Implementation Method 4
a heat sink disposed on an opposite side to the incident side of the reflective light modulation element is further provided, and the light blocking plate is connected to the heat sink in a thermally conductive manner
Data Source
AI summary
A light modulation device includes: a reflective light modulation element which modulates an incident light; a holding section which holds the reflective light modulation element; and a light blocking plate disposed on an incident side which incidents the incident light to the reflective light modulation element, and fixed to the holding section, wherein a thermal conductivity of the light blocking plate is equal to or higher than a thermal conductivity of the holding section.