Projection Optics Window Insulation to Prevent Post-Shutdown Clouding
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Solution Overview
Problem
The attachment of fat-and-oil-based organic substances such as sealant or heat-conducting grease to the transparent member in the optical system unit of a projection display device leads to clouding and a decrease in optical performance due to gasification and condensation on the transparent member.
Innovation Solution
The transparent member is retained at a temperature 1° C. or more higher than the inner-wall temperature of the outer shell member after the light source is turned off, using a glass cover member with a thermal insulation layer to maintain this temperature difference and prevent gas attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the light source is turned on, then the temperature in the light source increases and fat-and-oil-based organic substances are gasified, but the floating gas is likely to be attached to the transparent member when the light source is turned off, causing clouding and decreased optical performance
Solution Approach 1:
The patent applies preliminary action by maintaining the transparent member at a retention temperature higher than the outer shell member temperature even after the light source is turned off. This temperature differential is established in advance and maintained for a specific period to prevent condensation of gasified organic substances on the transparent member, thereby preventing clouding and maintaining optical performance.
2Manufacturing precision
If the transparent member is cooled down quickly after the light source is turned off, then the temperature difference causes gas condensation on the transparent member, but maintaining high temperature requires additional energy and time
Solution Approach 1:
The patent applies parameter changes by precisely controlling the temperature parameter of the transparent member. Specifically, the transparent member is maintained at a retention temperature that is higher than the outer shell member temperature by a specific differential (1°C or more) for a defined period after the light source is turned off. This controlled parameter change prevents condensation while minimizing energy consumption compared to maintaining high temperature indefinitely.
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 solution effectively prevents the attachment of floating gases to the transparent member, maintaining optical performance by ensuring the transparent member remains at a higher temperature than the outer shell member, thereby reducing clouding and performance degradation.
Implementation Method 1
the transparent member is retained at a retention temperature which is higher by 1° C. or more than an inner-wall temperature of the outer shell member after a light source has been turned off
Data Source
AI summary
A projection display device includes a light source; and an optical system unit configured to process a light from the light source and to emit the light outside the projection display device. The optical system unit includes an outer shell member having an emission opening positioned at a position from which the light is emitted; and a transparent member disposed at the emission opening of the outer shell member at the emission opening. The transparent member is retained at a retention temperature which is higher by 1° C. or more than an inner-wall temperature of the outer shell member after a light source has been turned off.