Vehicle Graphics Projector Brightness Control for Ambient Light
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Solution Overview
Problem
Current graphics projector and head-up display systems for vehicles struggle to maintain consistent perceived brightness of projected graphics due to variations in ambient light levels and graphic projection area.
Innovation Solution
A system comprising a vehicle sensor, a graphics projector with multiple light source modules, and a controller that determines ambient light levels and graphic projection area to calculate a projector brightness offset value, adjusting the projector's brightness accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the graphics projector increases brightness to compensate for large projection areas, then the projected graphics become visible in bright environments, but the graphics appear overly bright in low ambient light conditions
Solution Approach 1:
The system dynamically adjusts the projector brightness offset value based on real-time ambient light level measurements from the vehicle sensor. The controller continuously monitors ambient light conditions and modifies the brightness offset accordingly, transitioning from static to dynamic brightness control to adapt to varying environmental conditions.
Solution Approach 2:
The system changes the brightness parameter by calculating and applying a dynamic offset value to the default brightness setting. This offset adjustment modifies the illumination intensity parameter in response to ambient light levels and projection area characteristics, enabling the projector to maintain optimal visibility across different conditions.
2Ease of operation
If the system uses a fixed brightness offset value, then the projector settings are simple to control, but the perceived brightness varies with ambient light levels and projection area
Solution Approach 1:
The system implements feedback by using the vehicle sensor to continuously monitor ambient light levels and feeding this information back to the controller. The controller then adjusts the brightness offset value based on this feedback, creating a closed-loop control system that maintains consistent perceived brightness despite varying environmental conditions.
Solution Approach 2:
The system performs self-adjustment by automatically calculating and applying the appropriate brightness offset value based on ambient light conditions and projection area characteristics. No manual intervention is required - the controller autonomously optimizes the brightness settings by considering both environmental factors and graphic properties.
3Reliability
If the system calculates brightness offset based on both ambient light level and projection area, then perceived brightness consistency is achieved, but the control system complexity increases
Solution Approach 1:
The controller performs multiple functions by simultaneously considering ambient light levels, projection area characteristics, and brightness offset calculation in a single integrated system. This multi-functional approach consolidates what could be separate complex subsystems into one unified controller that handles all brightness adjustment decisions.
Solution Approach 2:
The system pre-calculates the brightness offset value by combining ambient light level data with projection area characteristics before projecting the graphics. This preliminary calculation ensures that the optimal brightness setting is determined in advance, avoiding the need for complex real-time adjustments during projection.
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
The system effectively maintains consistent perceived brightness of projected graphics across varying ambient light conditions and graphic sizes, enhancing occupant comfort and convenience.
Implementation Method 1
an optical filter in optical communication with the LED array. The optical filter is configured to receive the first source light and transmit a filtered light
Implementation Method 2
a focusing lens in optical communication with the optical filter. The focusing lens is configured to receive the filtered light and transmit a narrow-beam light
Implementation Method 3
an optical collimator in optical communication with the at least one light source module. The optical collimator is configured to receive the narrow-beam light and transmit a collimated light
Implementation Method 4
an optoelectrical mirror in optical communication with the optical collimator. The optoelectrical mirror is configured to direct the collimated light
Data Source
AI summary
A system for controlling a brightness of a graphics projector for a vehicle includes a vehicle sensor, the graphics projector including at least one light source module, and a controller in electrical communication with the vehicle sensor and the graphics projector. The controller is programmed to determine an ambient light level using the vehicle sensor. The controller is further programmed to determine a projector brightness offset value based at least in part on the ambient light level. The controller is further programmed to project a graphic using the graphics projector based at least in part on the projector brightness offset value.