AVN Screen Brightness Control via Illumination Sensor Feedback
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Solution Overview
Problem
Conventional AVN systems maintain a fixed screen brightness, leading to decreased visibility of content during changes in external illumination, such as night driving or entering tunnels or bright areas, as they do not adapt to varying lighting conditions.
Innovation Solution
An apparatus and method that utilize an illumination sensor to adjust screen brightness based on stored default matching relationships, allowing for user customization and stage-by-stage dimming control, with adjustments influenced by vehicle speed to optimize visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screen brightness is maintained at a fixed preset value, then energy consumption is reduced and control is simplified, but visibility of content is degraded when external illumination changes
Solution Approach 1:
The system uses an illumination sensor to automatically detect external lighting conditions and adjusts screen brightness without user intervention. The control module autonomously matches screen brightness to illumination data, making the system self-regulating and eliminating manual adjustment needs.
Solution Approach 2:
The system continuously monitors illumination data from the sensor and uses this feedback to dynamically adjust screen brightness. The control module compares current illumination levels with stored matching relationships and modifies brightness accordingly, creating a closed-loop control system that adapts to changing conditions.
2Reliability
If screen brightness is automatically adjusted according to illumination changes, then visibility is improved, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The illumination sensor serves multiple functions: it detects ambient light levels, triggers brightness adjustment, and provides data for the control algorithm. The control module integrates sensor data processing, brightness calculation, and display control in a single unit, reducing overall system complexity despite added functionality.
Solution Approach 2:
The system changes the brightness parameter dynamically based on illumination data rather than maintaining a fixed value. By storing multiple matching relationships between illumination levels and brightness settings, the system can quickly switch between predefined parameters or interpolate values, simplifying the control logic.
3Reliability
If screen brightness is increased in bright environments, then visibility is improved, but glare is increased causing discomfort
Solution Approach 1:
The system dynamically changes brightness parameters based on illumination conditions, selecting optimal values from stored matching relationships. This ensures visibility is maintained without excessive brightness that would cause glare, as the brightness level is precisely matched to ambient lighting conditions.
Solution Approach 2:
The continuous monitoring of illumination data provides feedback that prevents over-brightening. The control module adjusts brightness in response to illumination changes, preventing glare by not exceeding the appropriate brightness level for current lighting conditions while maintaining visibility.
4Reliability
If screen brightness is rapidly adjusted to match illumination changes, then visibility is quickly restored, but visual discomfort is caused by abrupt transitions
Solution Approach 1:
The system adjusts brightness in periodic stages rather than instantaneously. The control module divides the total brightness change into multiple smaller steps over time, allowing the display and human eyes to adapt gradually. This staged approach maintains visibility while minimizing visual discomfort from transitions.
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 solution dynamically adjusts screen brightness to match changing illumination conditions, enhancing visibility and reducing glare, thereby improving the user experience and safety by ensuring optimal display settings in various lighting environments.
Implementation Method 1
an illumination sensor that measures illumination outside a vehicle per certain period
Data Source
AI summary
An apparatus and a method for automatically controlling a screen brightness of an AVN system are provided to automatically change screen brightness in a user customized manner in a response to a change in illumination outside the vehicle. The apparatus include a screen brightness control module that controls such that a screen brightness of a display provided in the AVN system is automatically changed according to a change in the illumination data received from the illumination sensor, based on a default matching relationship between previously stored illumination data and screen brightness and a gain adjustment module that generates a new customized matching relationship by correcting the screen brightness matched to each illumination data based on the default matching relationship in accordance with an input of a user who adjusts to enhance or weaken the screen brightness and provides the screen brightness control module with the new customized matching relationship for screen brightness control.