Projection Display Light Source Cooling Segmentation
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Solution Overview
Problem
Projection-type image display devices using high-luminance light sources face heat-related issues that reduce luminescence and lifespan, and solid-state light sources require stricter heat management due to lower operational temperature requirements.
Innovation Solution
The device employs three color-specific light sources with separate cooling systems, including a Peltier device-based liquid cooler and optical path configurations like curved paths and integrators to efficiently cool and miniaturize the device, ensuring effective heat management and uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-luminance light sources are used to improve image display brightness, then illumination intensity is improved, but heat generation increases causing reduction in luminescence property and lifetime
Solution Approach 1:
The light source system is segmented into three separate color-specific light sources (red, green, blue) with individual cooling systems. Each light source has its own cooler, allowing independent temperature control and optimization for each color channel, thereby maintaining high luminance while managing heat generation to preserve lifetime.
Solution Approach 2:
A Peltier device is introduced as an intermediary cooling mechanism between the light source and the environment. This active cooling intermediary efficiently removes heat from the light sources, enabling them to operate at high luminance without excessive temperature rise that would reduce lifetime.
2Productivity
If solid-state light sources are used to improve device efficiency, then productivity is improved, but stricter heat management is required due to lower operational temperature requirements
Solution Approach 1:
The cooling system is segmented into three independent coolers, each dedicated to a specific solid-state light source. This allows precise temperature control for each light source according to its specific operational requirements, enabling high efficiency operation while maintaining appropriate temperature levels for each color channel.
Solution Approach 2:
Each light source is provided with a dedicated cooler that provides localized cooling tailored to the specific thermal characteristics and operational temperature requirements of that particular solid-state light source, allowing optimal temperature control for maximum efficiency.
3Reliability
If separate cooling systems are provided for each light source to improve temperature control, then reliability is improved, but device complexity increases
Solution Approach 1:
The three separate cooling systems are merged into a single integrated cooling unit that cools all three light sources. This combining approach maintains the temperature control precision of individual cooling while reducing overall system complexity by sharing common cooling components and structure.
4Volume of moving object
If optical paths are configured with curve portions to fold light paths for miniaturization, then volume is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The optical paths are folded using curve portions that utilize three-dimensional spatial arrangement. This dimensional approach allows the optical paths to be compacted within a smaller volume while maintaining proper alignment through careful design of the curved path geometry in multiple dimensions.
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 approach allows for efficient cooling of light sources, miniaturization, reduced weight and cost, and improved image quality with consistent luminance and color, while maintaining high luminous efficiency and coherence, even under varying environmental temperatures.
Implementation Method 1
means for cooling each of the light sources, comprising a Peltier device
Implementation Method 2
a first cooler configured to cool a first light source of the three light sources, and a second cooler configured to cool a second light source and a third light source
Data Source
AI summary
A projection-type image display device includes three light sources respectively configured to emit a different colored outgoing light, a light combining unit configured to combine outgoing lights, and a projection unit configured to project a combined light combined by the light combining it. The projection-type image display device includes a first cooler configured to cool a first light source of the three light sources, and a second cooler configured to cool a second and a third light source of the three light sources except the first light source.