Projector Solid-State Light Source Temperature Control
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Solution Overview
Problem
Projector devices using solid-state light sources face challenges in improving contrast ratio due to variations in light emission efficiency with temperature, which affects image quality.
Innovation Solution
A projector device with a temperature adjustment mechanism that controls the solid-state light source's temperature based on the luminance state of the image, using electric heating coils, fans, and a heatsink to adjust light emission efficiency, thereby enhancing contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the temperature of the solid-state light source is increased to lower light emission efficiency, then the contrast ratio is improved, but the light emission efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the temperature of the solid-state light source variable rather than fixed. The temperature is dynamically adjusted based on the luminance state of the image being projected - increased for dark images to reduce light emission and improve contrast, and decreased for bright images to maintain efficiency. This dynamic temperature control resolves the contradiction between contrast ratio improvement and light emission efficiency maintenance.
Solution Approach 2:
The patent changes the temperature parameter of the solid-state light source according to different operating conditions (luminance states). By varying this physical parameter, the system achieves different light emission efficiency levels appropriate for different image types, thereby improving contrast ratio for dark images without permanently sacrificing overall efficiency.
2Manufacturing precision
If the temperature of the solid-state light source is controlled to adjust light emission efficiency, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The patent implements feedback control where the luminance state of the image is detected and used to control the temperature adjustment device, which in turn controls the solid-state light source temperature. This closed-loop feedback system automatically adjusts temperature based on actual image conditions, improving image quality while keeping the control logic relatively simple and systematic.
3Manufacturing precision
If the light emission efficiency is lowered for dark images, then the contrast ratio is improved, but the energy consumption increases
Solution Approach 1:
The patent applies partial action by adjusting the temperature only when and to the extent necessary for improving contrast ratio. Instead of continuously operating at high temperature, the system selectively increases temperature only for dark images where contrast improvement is needed, and maintains lower temperature for bright images, thereby minimizing unnecessary energy consumption while achieving the desired contrast enhancement.
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 adjusts light emission efficiency to improve contrast ratio by lowering it for dark images and increasing it for bright images, resulting in enhanced image quality.
Implementation Method 1
some solid-state light sources of which light emission efficiency varies depending on temperature states are known
Implementation Method 2
the temperature of the solid-state light source is increased to lower light emission efficiency
Data Source
AI summary
An improvement in quality is achieved by improving a contrast ratio. Therefore, in a projector device including a light source device using a solid-state light source (AR) includes a temperature adjustment device (190) capable of setting a state in which a temperature of at least the solid-state light source is caused to increase. Then, a determination unit (12) determines a luminance state of an image and a control unit (16) controls a heat state of the solid-state light source (AR) by controlling the temperature adjustment device (190) on the basis of a determination result. In particular, by increasing the temperature of the solid-state light source (AR) in accordance with an image, light emission efficiency is lowered to decrease luminance.