HUD Brightness Control via Driver Visual Range
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Solution Overview
Problem
Conventional head-up display (HUD) systems fail to adjust virtual image luminance effectively within the driver's visual range, leading to difficulties in visibility due to either excessive brightness or darkness, as they do not consider the specific range of the front scenery when adjusting luminance.
Innovation Solution
A vehicle display control device that includes a visual line position specifying unit and a display control unit, which adjusts the display image brightness based on the brightness within a predetermined range of the foreground scenery relative to the driver's visual line position, ensuring the image is projected within the driver's visual range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the virtual image luminance is increased according to the strong brightness of a place outside the driver's view range, then the luminance is adjusted based on bright areas, but the driver cannot easily see the virtual image display because it is too bright for the driver's actual visual range
Solution Approach 1:
The patent applies local quality by adjusting the luminance based on the specific local area within the driver's visual range rather than the entire front scenery. The control unit specifies a visual range of the driver and adjusts luminance according to brightness only within this localized area, ensuring the virtual image luminance matches the actual viewing conditions where the driver is looking.
Solution Approach 2:
The patent segments the front scenery into multiple regions based on the driver's visual range. By dividing the overall view into the driver's specific visual range and other areas, the system adjusts luminance only for the relevant segment (within visual range) while ignoring bright areas outside this segment, thus preventing over-brightness in the actual display area.
2Illumination intensity
If the virtual image luminance is reduced according to the brightness in a range that does not include the driver's visual range, then the luminance is adjusted based on darker areas, but the driver cannot easily see the virtual image display because it is too dark for the driver
Solution Approach 1:
The patent applies local quality by focusing luminance adjustment on the specific local area within the driver's visual range. Instead of adjusting based on the entire front scenery or areas outside the visual range, the system tailors the luminance to match the brightness conditions specifically where the driver is looking, ensuring optimal visibility.
Solution Approach 2:
The patent segments the front scenery to identify and isolate the driver's visual range from other areas. By this segmentation, the system ensures luminance adjustment is applied only to the relevant segment (within visual range) rather than being influenced by darker areas outside this segment, thus preventing under-brightness in the actual display area.
3Device complexity
If the virtual image display luminance is adjusted without considering the driver's visual range, then the adjustment process is simple, but the driver may not have easily visual contact with the virtual image display
Solution Approach 1:
The patent applies preliminary action by first specifying the driver's visual range before performing luminance adjustment. The control unit identifies the visual range in advance and uses this information as the basis for adjusting luminance, ensuring that the adjustment is targeted to the correct area from the outset rather than requiring complex iterative adjustments afterward.
Solution Approach 2:
The patent applies dynamics by making the luminance adjustment adaptive to the driver's actual visual conditions. The system dynamically determines the visual range and adjusts luminance accordingly, allowing the display to adapt to changing viewing conditions while maintaining a relatively simple adjustment mechanism based on real-time visual range detection.
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 allows for a more easily visible virtual image display by adjusting the brightness according to the driver's visual range, preventing the image from being too bright or too dark, thereby enhancing visibility for the driver.
Implementation Method 1
a head-up display that superimposes and displays the display image as a virtual image over a foreground scenery of the vehicle by projecting the display image onto a projection member
Data Source
AI summary
A vehicle display control device, which adjusts a brightness of a display image as a display image brightness of a head-up display that superimposes and displays the display image as a virtual image over a foreground scenery of the vehicle by projecting the display image onto a projection member, includes: a visual line position specifying unit that specifies a visual line position of the driver of the vehicle; and a display control unit that adjusts the display image brightness according to the brightness in a set range of the foreground scenery with respect to the visual line position as a reference point.