Vehicle HUD Eye-Box Control for Lower Heat and Power
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Solution Overview
Problem
Conventional head-up displays (HUDs) face challenges in efficiently managing light distribution to accommodate varying eye positions of drivers, leading to increased power consumption and heat generation due to the use of multiple high-luminance LEDs, which complicates handling drivers outside the eye range.
Innovation Solution
A vehicle display device that includes a display unit, a reflector, an eye point acquisition unit, and a control unit, which adjusts the direction of display light to match the eye box of individual drivers, reducing the light distribution range and power consumption by dynamically changing the optical path based on acquired eye points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light distribution range of display light is set to be relatively wide in accordance with the eye range, then visibility for multiple drivers is improved, but the number of high-luminance LEDs increases resulting in increased heat generation and larger heat sink size
Solution Approach 1:
The patent applies dynamics by making the light distribution range adjustable rather than fixed. The control unit dynamically changes the light distribution range based on the detected eye position, switching between a narrow range for single-driver scenarios and a wide range for multi-driver scenarios, thereby optimizing the balance between visibility and heat generation adaptively
Solution Approach 2:
The patent changes the parameter of light distribution range width based on detected eye position. When multiple eye positions are detected, the system expands the light distribution range to cover all drivers; when a single eye position is detected, the system narrows the range to reduce LED usage and heat generation
2Use of energy by moving object
If the light distribution range is narrowed to reduce power consumption, then heat generation decreases, but it becomes difficult to accommodate drivers outside the eye range
Solution Approach 1:
The system dynamically adjusts the light distribution range based on real-time eye position detection. When a driver moves outside the current eye range, the system expands the light distribution range to include the new position, ensuring continuous adaptability without permanently maintaining high power consumption
Solution Approach 2:
The patent implements feedback by detecting eye positions and using this information to control the light distribution range. The control unit continuously monitors eye positions and adjusts the display light parameters accordingly, creating a closed-loop system that optimizes power consumption while maintaining visibility for all drivers
3Illumination intensity
If multiple high-luminance LEDs are used to cover the eye range, then visibility is maintained, but the heat sink size increases
Solution Approach 1:
The patent applies partial action by using only the necessary number of LEDs to cover the detected eye range. Instead of always using all LEDs to cover the maximum eye range, the system activates only the subset of LEDs needed for the current viewing scenario, reducing heat generation while maintaining sufficient illumination intensity
Solution Approach 2:
The system changes the parameter of light distribution range width based on detected eye position. When multiple eye positions are detected, the system expands the light distribution range to cover all drivers; when a single eye position is detected, the system narrows the range to reduce LED usage and heat generation
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 reduces power consumption and heat generation, allowing for a smaller heat sink and potentially fewer LEDs, while ensuring drivers can recognize virtual images without compromising visibility, even when outside the standard eye range.
Implementation Method 1
a reflector that reflects the display light incident from the display unit toward the projected member
Data Source
AI summary
A vehicle display device includes a display unit that emits display information to be visually recognized by a driver as display light, and an aspheric mirror that reflects the display light toward a windshield. The display unit emits the display light that is narrower than an eye range based on a distribution range of eye points of a plurality of drivers, and corresponds to an eye box, which is a light distribution range based on an acquired eye point.