Head-Up Display Light Source Control for Luminance and Thermal Management
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Solution Overview
Problem
Head-up display (HUD) devices face challenges in increasing brightness for improved visibility in bright environments without increasing manufacturing costs or power consumption, and miniaturization is hindered by the number of light sources, which also limits luminance due to heat generation and temperature effects.
Innovation Solution
A projection display device with multiple light sources of different colors, a light source control unit that adjusts emission patterns based on temperature and brightness, and a temperature detection unit to optimize light emission, allowing for reduced power consumption and manufacturing costs while enhancing image luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emission amount of the light source is increased to improve luminance, then visibility is improved, but heat generation amount increases and light emission amount decreases with temperature rise
Solution Approach 1:
The patent combines multiple light sources (first light source and second light source) to emit light of the same color simultaneously, merging their light emission to achieve higher luminance without requiring a single light source to operate at excessively high power levels that would cause problematic heat generation
Solution Approach 2:
The patent dynamically adjusts the light emission amounts of multiple light sources based on temperature conditions. When temperature is high, the system activates both light sources to share the emission load; when temperature is low, it operates with a single light source, thereby adapting to thermal conditions to prevent overheating while maintaining visibility
2Illumination intensity
If the number of light sources is increased to improve visibility, then luminance is improved, but manufacturing cost increases
Solution Approach 1:
The system dynamically controls the operation of multiple light sources based on temperature conditions rather than operating all light sources continuously. This selective activation reduces the effective complexity of the system during normal operation while maintaining the capability for high luminance when needed, thereby managing manufacturing costs more effectively
Solution Approach 2:
The patent changes the operational parameters (light emission amount, activation state) of existing light sources based on temperature conditions rather than adding more light sources unconditionally. This parameter-based control optimizes visibility while avoiding the need for a permanently complex multi-light-source configuration that would increase manufacturing costs
3Illumination intensity
If the number of light sources is increased to improve visibility, then luminance is improved, but device size increases
Solution Approach 1:
The patent merges the optical paths and emission control of multiple light sources into a unified system that shares common optical components and control mechanisms. This merging approach allows multiple light sources to be integrated in a compact manner, achieving high luminance without proportionally increasing device volume
Solution Approach 2:
The system dynamically activates only the necessary number of light sources based on thermal conditions, effectively reducing the active optical components at any given time. This dynamic operation allows the device to maintain high luminance capability when needed while operating in a more compact thermal profile during normal conditions
4Illumination intensity
If the light emission amount is increased to improve luminance, then visibility is improved, but power consumption increases
Solution Approach 1:
The patent merges the power consumption burden across multiple light sources by having them operate simultaneously at moderate power levels rather than requiring a single light source to consume excessive power. This distribution of power load achieves high luminance while keeping individual and total power consumption within acceptable limits
Solution Approach 2:
The system dynamically adjusts power consumption by activating multiple light sources only when temperature conditions permit, rather than operating at maximum power continuously. This dynamic power management achieves high luminance when needed while reducing average power consumption to acceptable levels
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 improves visibility without increasing manufacturing costs or power consumption, achieving higher luminance and reducing heat-related issues, while allowing for miniaturization of HUD devices.
Implementation Method 1
a temperature detection unit that detects temperature
Implementation Method 2
a plurality of light sources that emit light beams with different colors
Data Source
AI summary
A projection display device and a light source control method thereof capable of improving visibility of specific information without increasing a manufacturing cost and a power consumption amount are provided. An HUD includes a plurality of light sources that emit light beams with different colors, a projection unit that projects light according to image information among the light beams emitted from the plurality of light sources onto a combiner, and a light source control unit that sequentially emits lights from the plurality of respective light sources according to a predetermined light emission amount pattern. The light source control unit performs control for causing at least one of the light sources other than a specific light source among the plurality of light sources to emit light with a smaller light emission amount than a light emission amount of the specific light.