Head-Up Display Backlight Control for Real-Virtual Brightness Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-up display devices experience discomfort due to changes in brightness when switching between real and virtual images, as the illumination systems for both images are designed exclusively, leading to differing brightness levels.
Innovation Solution
The device employs separate backlights for real and virtual images, with control units managing the power consumption and lighting density to maintain consistent brightness levels by adjusting the power consumption and lighting patterns for each image type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate illumination optical systems are designed exclusively for real image and virtual image display, then each image type can have optimized lens design, but the brightness levels differ causing viewer discomfort during switching
Solution Approach 1:
The patent merges the illumination control of real image and virtual image into a unified system by making the second illumination optical system share the same light source (second light source 14B) with the first illumination optical system. This allows coordinated control of both illumination systems to achieve consistent brightness levels during image switching, while still maintaining optimized lens designs for each image type.
2Manufacturing precision
If the light source emits illumination light that converges to the first display unit, then the real image display is optimized, but the brightness is darker compared to virtual image display
Solution Approach 1:
The patent applies parameter changes by controlling the power consumption of the second light source 14B to be greater than or equal to that of the first light source 14A. This parameter adjustment compensates for the inherent brightness difference caused by the converging illumination design, ensuring that the real image display achieves sufficient brightness levels comparable to virtual image display.
3Manufacturing precision
If the light source emits illumination light that diverges to the second display unit, then the virtual image display is optimized, but the real image display becomes darker
Solution Approach 1:
The patent merges the illumination control by making the second illumination optical system share the same light source (second light source 14B) with the first illumination optical system. This unified approach allows the diverging illumination design optimized for virtual images to also benefit the real image display through coordinated power control, eliminating the brightness disparity between the two display modes.
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 approach reduces discomfort by minimizing brightness changes during image transitions and allows for optimized lens designs for both image types, ensuring appropriate brightness and uniformity in both virtual and real image displays.
Implementation Method 1
a first reflection member that reflects the first display light incident from one surface and causes the second display light incident from the other surface to pass through
Implementation Method 2
a second reflection member that reflects the first display light reflected by the first reflection member or the second display light that has passed through the first reflection member to guide the first display light or the second display light to the emission port
Data Source
AI summary
A head-up display device includes two systems each having a backlight including light sources, a display that causes illumination light of the light sources to pass therethrough to generate display light, and a control unit that controls turning on and off of the light sources, in which, when a virtual image is displayed, a second control unit performs control such that at least some of second light sources are turned on, and, when a real image is displayed, a first control unit performs control such that at least some of first light sources are turned on, and performs control such that the power consumption of the first light sources per unit area of a first display is made to be larger than the power consumption of the second light sources per unit area of a second display when the virtual image is displayed.