Vehicle Display Gamma Adjustment for Ambient Light Visibility
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Solution Overview
Problem
Vehicle displays face challenges in maintaining symbology of human visibility due to external factors such as ambient light and forward-looking light, which disrupt the intended presentation of video images.
Innovation Solution
A display system that dynamically adjusts image signals by using ambient light and forward-looking light sensors, along with a microcontroller, to generate enhanced setpoints that compensate for these factors, ensuring the display maintains symbology without remapping gray shade values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display presents video images with fixed luminance characteristics, then the display structure remains simple and energy consumption is low, but external light factors disrupt the symbology of human visibility
Solution Approach 1:
The display system dynamically adjusts luminance characteristics by modifying gamma transfer function setpoints in response to measured ambient light conditions, transitioning from a static display to an adaptive one that maintains visibility symbology under varying external conditions
Solution Approach 2:
The system uses ambient light sensors to continuously measure external light conditions and feeds this information back to the microcontroller, which then adjusts the gamma setpoints accordingly, creating a closed-loop control system that maintains display performance
2Illumination intensity
If the display dynamically adjusts image signals to compensate for external factors, then the perceived ambient contrast ratio improves, but the device complexity and processing requirements increase
Solution Approach 1:
The system changes the gamma transfer function parameters (setpoints) based on measured ambient light conditions, adjusting the luminance characteristics of the display to maintain optimal contrast ratio and visibility under different lighting environments
Solution Approach 2:
The system applies selective adjustments to specific portions of the video signal through gamma setpoint modifications rather than processing the entire signal, achieving effective compensation with minimal processing overhead
3Speed
If the display updates image content at high frame rates, then the image quality and responsiveness improve, but the ability to track slower physiological responses of human vision is reduced
Solution Approach 1:
The system updates gamma setpoints at strategically chosen intervals that align with human physiological response times rather than at every frame, reducing unnecessary processing while maintaining effectiveness in compensating for ambient light changes
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 enhances video image visibility by dynamically adjusting luminance and gamma characteristics, maintaining intended visibility despite external influences, without the need for complex content manipulation.
Implementation Method 1
measuring external factors influencing symbology of human visibility... The display system may utilize a communication link between one or more source drivers of the display subsystem and the host microcontroller... The light sensor input may be filtered to accommodate pupillary responses to changes in ambient brightness
Implementation Method 2
The system may periodically receive input of ambient light conditions from an ambient light sensor and may apply a corresponding transformation to a gamma transfer function, other type of transfer function, or other characteristic of the display, such as to thereby improve the perceived ambient contrast ratio
Implementation Method 3
The source drivers may allow for dynamic gamma transfer function adjustments or other adjustments to transfer functions... a relationship may be created between applied voltage and a given pixel's transmission rate, and for an emissive display, a relationship may be created between applied current and subpixel luminance
Data Source
AI summary
Dynamic enhancement of video images presented through an electronic display. The dynamic enhancement may be utilized with a display of a vehicle and include measuring an ambient light or other external influences influencing symbology of human visibility for the video images to be presented through the display, generating a plurality of enhanced setpoints operable for maintaining symbology of the video images against the ambient light, and directing the display to present the video images according to the enhanced setpoints such that the symbology of the video images is reasonably maintained against the external influences.