HUD Light Source Control for Brightness and Heat Management
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Solution Overview
Problem
Head-up display (HUD) systems face challenges in maintaining image brightness under high temperature environments without increasing power consumption, which affects visibility of critical information, especially in vehicles, and existing methods either require additional display units or are not applicable to field sequential color imaging.
Innovation Solution
A projection-type display device using multiple light sources that emit different colors, with a light source control unit that adjusts light emission patterns to increase the brightness of specific light sources while reducing others, allowing for time-division emission to enhance visibility without increasing power consumption or heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amounts of emitted light beams of multiple light sources are increased to increase the brightness of the displayed image, then the brightness of the displayed image is improved, but the amount of heat generation in the light source unit is increased and power consumption increases
Solution Approach 1:
The patent applies periodic action by time-division multiplexing the light sources, where each light source emits light in alternating time slots rather than simultaneously. The light source control unit controls the plurality of light sources to sequentially emit light beams in a time-division manner, allowing each light source to operate at high intensity during its designated time slot while remaining off during other slots, thus achieving high overall brightness without continuous heat generation from all sources
Solution Approach 2:
The patent applies dynamics by making the light emission pattern adjustable and adaptive. The light source control unit can dynamically switch between different light emission patterns (first pattern with all light sources at predetermined amounts, second pattern with specific light source increased and others reduced) based on temperature conditions and power consumption requirements, optimizing the balance between brightness and heat generation
2Illumination intensity
If the amounts of emitted light beams of multiple light sources are increased to increase the brightness of the displayed image, then the brightness of the displayed image is improved, but the power consumption is increased
Solution Approach 1:
The patent applies periodic action by time-division multiplexing the light sources, where each light source emits light in alternating time slots rather than simultaneously. This allows the system to achieve high overall brightness output while each individual light source operates at high intensity only during its designated time slot, reducing total power consumption compared to all sources operating simultaneously at reduced intensity
Solution Approach 2:
The patent applies dynamics by making the light emission pattern adjustable and adaptive. The light source control unit can dynamically switch between different light emission patterns based on temperature conditions and power consumption requirements, optimizing the balance between brightness and power consumption in real-time
3Loss of information
If a dedicated display unit is added to notify abnormal state to user, then the abnormal state notification is improved, but the device complexity and cost are increased
Solution Approach 1:
The patent applies universality by making the existing light sources serve dual functions: both image display and abnormal state notification. The light source control unit controls the plurality of light sources to sequentially emit light beams with different colors in synchronization with color light beams corresponding to respective pixels, and can also use the same light sources to display abnormal state information, eliminating the need for a dedicated display unit
Solution Approach 2:
The patent applies merging by combining the abnormal state notification function with the existing light source system. Instead of adding a separate dedicated display unit, the patent merges the notification function into the existing light sources, which can display both normal image content and abnormal state information by controlling the emission patterns and colors of the light sources
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 effectively improves the visibility of specific information in HUDs by optimizing light emission patterns based on temperature, ensuring clear notification of critical information without increasing power consumption or heat generation, and is applicable to both normal and high-temperature conditions.
Implementation Method 1
a plurality of light sources that emit light beams with different colors
Data Source
AI summary
A projection-type display device includes: a plurality of light sources that emit light beams with different colors; a projection unit that projects light beams based on image information among light beams emitted from the plurality of light sources onto a projection screen; and a light source control unit that selectively performs first control or second control as defined herein.