Vehicle HUD Luminance Control for Superimposition
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Solution Overview
Problem
Existing head-up display (HUD) technologies for vehicles face a challenge in maintaining a high sense of superimposition between displayed information and actual scenery, as increased visibility of display objects can cause them to appear floating rather than integrated into the scenery, leading to incorrect driver interpretations.
Innovation Solution
A display apparatus comprising a projected member, a projecting unit, a measuring unit, and a control unit that adjusts the luminance value of display objects based on background luminance and chromaticity values to optimize the sense of superimposition, using specific mathematical expressions to determine the optimal luminance for the display objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If display luminance is increased to improve visibility of display objects, then visibility is improved, but the sense of superimposition deteriorates causing objects to appear floating
Solution Approach 1:
The patent dynamically adjusts the luminance parameter of display objects based on the luminance of the background scenery. By changing the display luminance parameter in response to background conditions, the system maintains both visibility and sense of superimposition without the display objects appearing floating.
Solution Approach 2:
The system measures the luminance value of the background and uses this feedback to automatically adjust the display luminance. This closed-loop control ensures that display objects maintain appropriate brightness relative to the background, preserving the sense of superimposition while ensuring visibility.
2Reliability
If display luminance is decreased to improve sense of superimposition, then sense of superimposition is improved, but visibility deteriorates
Solution Approach 1:
The system dynamically modifies the display luminance parameter based on real-time background measurements. When background luminance is low, display luminance is reduced to maintain superimposition; when background luminance is high, display luminance is increased to maintain visibility, optimizing both parameters simultaneously.
Solution Approach 2:
The patent implements dynamic luminance adjustment rather than fixed settings. The display luminance continuously adapts to changing background conditions, allowing the system to maintain both sense of superimposition and visibility across varying environmental conditions.
3Illumination intensity
If display objects are made more visible, then visibility is improved, but driver interpretation accuracy deteriorates due to floating perception
Solution Approach 1:
By dynamically adjusting display luminance based on background measurements, the system ensures display objects blend appropriately with the background scenery. This prevents the floating perception that would otherwise cause driver misinterpretation, while maintaining sufficient visibility for accurate information delivery.
Data Source
AI summary
In a display apparatus, a projected member is arranged in a direction in which a driver of a moving body looks while driving, from the perspective of the driver. A projecting unit projects at least one display object in a position that overlaps a background that is visible to the driver through the projected member, so as to be displayed in a superimposed manner as a virtual image. A measuring unit measures a luminance value of the background. A control unit determines a luminance value of the display object based on the luminance value of the background measured by the measuring unit, chromaticity values of the display object, and a sense of superimposition that is a value having a range of 0 or greater and 100 or less, and controls the projecting unit such that the display object is projected at the luminance value of the display object.