Projector LED Cooling and Power Control
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Solution Overview
Problem
Projection-type image display devices face challenges in maintaining optimal light emission characteristics and cooling efficiency when used in various installation states, particularly when connected to portable terminals or PCs, due to the different light emission characteristics and heat generation rates of red, green, and blue solid-state light sources.
Innovation Solution
The device incorporates a cooling structure with heat pipes and a power control system that adjusts driving power to each solid-state light source based on its light emission characteristics and installation state, using a posture sensor to optimize cooling efficiency and maintain balanced color characteristics across different installation positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-state light sources (LEDs) are used in a projector, then light conversion efficiency and durability are improved, but heat generation requires efficient cooling systems which complicates the device structure
Solution Approach 1:
The cooling system is segmented into three independent heat pipes, each dedicated to cooling a specific color LED (red, green, blue). This segmentation allows targeted cooling of each light source based on its specific heat generation characteristics, improving cooling efficiency while maintaining manageable system complexity
Solution Approach 2:
The heat pipe cooling system serves multiple functions: it cools three different color LEDs simultaneously, acts as a structural support framework, and provides a pathway for heat dissipation from multiple light sources through a unified thermal management architecture
2Illumination intensity
If different solid-state light sources (R, G, B LEDs) are used, then various colors are achieved, but light emission characteristics vary significantly requiring complex power control
Solution Approach 1:
Each LED color (red, green, blue) is assigned a specific driving power value tailored to its unique light emission characteristics. The red LED receives higher driving power (e.g., 100mA) compared to green (e.g., 50mA) or blue (e.g., 30mA) to compensate for differences in luminous efficiency and color perception, achieving balanced white light output without requiring complex real-time adjustments
Solution Approach 2:
The system adjusts the driving power parameter for each LED based on pre-determined optimal values that account for their respective light emission characteristics. By changing the current parameter individually for each color LED, the system achieves consistent color mixing and white light quality across different operating conditions
3Adaptability or versatility
If the projector is used in various installation states (portable use), then versatility is improved, but cooling efficiency and light emission characteristics change with posture
Solution Approach 1:
The cooling system is designed with dynamic adaptability through multiple heat pipes that can effectively dissipate heat regardless of the projector's orientation. The heat pipe configuration and thermal conduction paths are engineered to maintain efficient heat transfer from the LEDs to the heat dissipation structures in various installation states (horizontal, vertical, ceiling-mounted), ensuring consistent cooling performance across different postures
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 ensures excellent light emission performance and durability by efficiently managing heat dissipation and power input to each light source, regardless of the device's installation state, thereby maintaining optimal color characteristics and preventing excessive junction temperature increases.
Implementation Method 1
each solid-state light source is provided with a cooling member... an efficient cooling operation using a heat pipe or the like is performed
Data Source
AI summary
A projection-type image display device includes: a light source unit that irradiates video light to be magnified and projected onto a reflection mirror; a video processing unit that generates the video light to be magnified and projected on the basis of an external electrical signal and light irradiated from the light source unit; and a projection-type optical system that magnifies and projects the video light output from the video processing unit, wherein the light source unit includes a red (R) solid-state light source, a green (G) solid-state light source, and a blue (B) solid-state light source each of which is configured as at least a solid-state light emitting device and each solid-state light source is provided with a cooling member, and wherein driving power input to each solid-state light source is controlled on the basis of light emission characteristics or the state of the cooling member.