Projection Apparatus Wavelength Conversion Heat Dissipation
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Solution Overview
Problem
High-brightness projectors generate excessive heat, causing light valve performance issues and image quality problems due to heat dissipation methods that inadvertently shift color points and contrast.
Innovation Solution
A projection apparatus with an illumination system featuring a laser light source and a wavelength conversion element with alternating optical regions, allowing the light valve to perform heat dissipation without affecting image quality by guiding the laser beam through different optical paths during specific intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-power light-emitting devices are used to achieve high-brightness design, then brightness is improved, but heat generation increases causing light valve performance degradation
Solution Approach 1:
The patent implements periodic action by alternating between projection mode and heat dissipation mode. The light valve performs normal projection function during projection mode, then switches to heat dissipation mode where micro lenses oscillate to generate wind flow. This periodic switching allows the system to maintain high brightness when needed while periodically removing accumulated heat, preventing thermal degradation of the light valve.
Solution Approach 2:
The patent converts the harmful effect of accumulated heat into a beneficial cooling mechanism. By allowing the light valve to enter heat dissipation mode periodically, the naturally generated heat is utilized to create temperature differential that drives air convection. The oscillating micro lenses amplify this effect, transforming the harmful thermal energy into useful cooling air flow that removes heat from the light valve.
2Temperature
If micro lenses are oscillated to dissipate heat, then heat dissipation is improved, but light beam reflection to unexpected position causes color point shift and image quality degradation
Solution Approach 1:
The system employs periodic action by strictly separating projection operation and heat dissipation operation into different time intervals. During heat dissipation mode when micro lenses oscillate, the laser light source is controlled not to emit light, or the optical path is switched away from the light valve. This temporal separation ensures that light beam reflection during oscillation does not reach the projection path, preventing color point shift while still achieving effective heat dissipation.
Solution Approach 2:
The patent introduces an intermediary control mechanism that manages the coordination between light source emission and light valve operation. This intermediary control ensures that when micro lenses are oscillating for heat dissipation, the optical path is properly managed so that reflected light does not interfere with the projection image. The control system acts as a mediator to prevent the harmful interaction between heat dissipation oscillation and light beam propagation.
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 reduces the probability of color point shift, maintaining good image quality by allowing heat dissipation without compromising the light valve's operation during high-brightness projection.
Implementation Method 1
the first optical functional region guides the laser beam to a first position with a first optical path, and the second optical functional region guides the laser beam to a second position with a second optical path
Implementation Method 2
The light valve is disposed on a transmission path of the illumination beam, and converts the illumination beam into an image beam
Implementation Method 3
dissipating heat by wind generated by oscillating the micro lenses on the light valve back and forth
Data Source
Figure 1~2B
Figure 3A~3B
Figure 3C~4
AI summary
A projection apparatus includes an illumination system (100) configured to output an illumination beam, a light valve (210) and a projection lens (220). The illumination system includes a laser light source (110) configured to emit a laser beam (IB) and a wavelength conversion element (120). A first region (R+) of the wavelength conversion element includes at least one first and second optical function region. In a first sub-time interval, the first optical functional region guides the laser beam to a first position (P1) with a first optical path, wherein the light valve (210) is located at the first position. In the second sub-time interval, the second optical functional region guides the laser beam to a second position (P2) with a second optical path, wherein the second position is different from the first position.