Head-Up Display Luminance Control Using Overlapping Mode Switching
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Solution Overview
Problem
Existing head-up display devices struggle to adjust the luminance of displayed images effectively while maintaining a desired color in varying illuminance conditions.
Innovation Solution
A head-up display device incorporating multiple light sources, a light source driver, and a control unit that utilizes first and second control modes with overlapping luminance ranges to adjust illumination light luminance, switching between modes based on a mode switching value to achieve the required luminance while maintaining a desired color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single control mode is used to adjust luminance, then the device structure is simple, but the luminance adjustment range is limited and color accuracy cannot be maintained across all luminance levels
Solution Approach 1:
The control unit is divided into multiple control modes (first control mode and second control mode), each optimized for specific luminance ranges. This segmentation allows the system to achieve a broader overall luminance adjustment range while maintaining color accuracy within each segment's optimal operating conditions.
Solution Approach 2:
The system dynamically switches between different control modes based on the required luminance level. The control unit selects the appropriate control mode (first or second) according to the target luminance, enabling adaptive luminance adjustment across a wide range while maintaining color accuracy through mode-specific optimization.
2Illumination intensity
If the luminance range of control modes does not overlap, then the mode switching is simple, but there is a luminance gap that cannot be achieved
Solution Approach 1:
The patent extracts the luminance adjustment function into separate control modes with overlapping ranges. By designing the first and second control modes to have overlapping luminance ranges, the system eliminates gaps in luminance coverage while maintaining simple mode switching logic based on target luminance thresholds.
3Adaptability or versatility
If the illuminance around the user changes, then the display needs to adapt to varying lighting conditions, but maintaining both luminance adjustment and color accuracy becomes difficult
Solution Approach 1:
The system uses illuminance sensors to detect ambient lighting conditions and provides feedback to the control unit. Based on this feedback, the control unit adjusts the luminance output and selects appropriate control modes to maintain color accuracy across varying illuminance conditions, enabling the display to adapt to different environmental lighting scenarios.
Data Source
AI summary
A head-up display device includes: light sources; a light source driver that drives the light sources; a second control unit that illuminates the light sources via the light source driver on the basis of illumination control data; and a DMD display element that generates display light on the basis of illumination light emitted by the light sources. The illumination control data includes control modes for generating the illumination light brightness corresponding to a requested brightness. The control modes have differing brightness ranges, which partially overlap each other. The second control unit switches modes between the control modes when the requested brightness has reached a mode switching value, which is located in a non-end part of an overlapping region where one of the brightness ranges of one of the control modes and another one of the brightness ranges of another one of the control modes overlap.