Projector Polarization Separator and Reflective Color Filter Thermal Management
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Solution Overview
Problem
Conventional projectors face challenges in suppressing the increase in temperature of liquid crystal panels while maintaining a compact size, as large cooling mechanisms are required to manage heat generated by color filters, which can lead to increased projector size.
Innovation Solution
A projector design incorporating a light source that outputs polarized white light, a polarization separator to reflect s-polarized light and transmit p-polarized light, a reflective liquid crystal panel, and a reflective color filter that transmits and reflects specific color lights, allowing for efficient modulation and projection while minimizing heat transfer and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a large cooling mechanism is provided to cool the liquid crystal panel, then the temperature increase of the liquid crystal panel is suppressed, but the projector size increases
Solution Approach 1:
The invention converts the harmful thermal energy into beneficial reflected light by using a reflective color filter that reflects color light toward the liquid crystal panel while directing heat away from it. This transforms the heat problem into an optical solution where the same optical path serves both image formation and heat management functions
Solution Approach 2:
The invention segments the optical path by using a polarization separator to divide light into reflected and transmitted components. The reflective color filter further segments the spectrum, allowing color light to be reflected for image formation while thermal radiation is directed away from the liquid crystal panel through different spatial paths
2Illumination intensity
If the intensity of light entering the color filter is increased, then the brightness of projected light is enhanced, but the heat generated by the color filter increases
Solution Approach 1:
The reflective color filter converts the harmful heat generated by high-intensity light into beneficial reflected color light. By using reflection instead of absorption, the system maintains high brightness while preventing heat accumulation in the color filter, as the reflected light carries the visual information without the thermal burden
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 effectively suppresses thermal effects on the liquid crystal panel, enables a compact cooling mechanism, and reduces the projector's size by eliminating the need for a polarizing plate and optimizing light usage for enhanced image brightness.
Implementation Method 1
a polarization separator that receives the white light incident from the light source apparatus, reflects the first polarized white light in a first direction, and transmits the second polarized white light in a second direction that intersects with the first direction
Implementation Method 2
a reflective color filter including first filters that are provided in accordance with the first pixels, transmit the first color light, and reflect the second color light and the third color light
Data Source
AI summary
A projector includes a polarization separator that reflects first polarized white light from a light source apparatus and transmit second polarized white light from the light source apparatus, a reflective liquid crystal panel that has first pixels that output first image light as a result of modulation of first color light contained in the first polarized white light and being the second polarized light, second pixels that output second image light as a result of modulation of second color light contained in the first polarized white light and being the second polarized light, and third pixels that output third image light as a result of modulation of third color light contained in the first polarized white light and being the second polarized light, a reflective color filter, and a projection lens that projects the first to third image light being the second polarized light.