Display Current Control for Vehicle Battery Voltage Fluctuations
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Solution Overview
Problem
In display apparatuses powered by vehicle batteries, a decrease in battery voltage due to start-stop systems can lead to excessive electric current flow in wire harnesses, causing luminance reduction and making it difficult for users to watch images, especially when the battery voltage is low.
Innovation Solution
A display apparatus with a controller that estimates electric current consumption based on pixel value information and reduces the electric current supplied when it exceeds a predetermined threshold, preventing excessive current flow and maintaining image luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display apparatus uses a power saving mode to prevent excessive current flow in the wire harness, then the electric current is controlled within allowable limits, but the luminance of images decreases frequently making it difficult for users to watch
Solution Approach 1:
The system dynamically changes the electric current supply parameter based on battery voltage conditions. When voltage drops below a threshold, the controller adjusts the current to stay within allowable limits while maintaining display functionality, resolving the contradiction between current control reliability and image luminance
Solution Approach 2:
The display apparatus monitors battery voltage in real-time and uses this feedback to adjust electric current supply dynamically. This closed-loop control ensures current remains within safe limits while minimizing impact on luminance, addressing both reliability and user viewing experience
2Power
If the display apparatus operates at boosted battery voltage, then the display can function with higher power, but an electric current greater than the allowable electric current may flow in the wire harness
Solution Approach 1:
The system dynamically adjusts electric current supply based on real-time battery voltage conditions. When operating at boosted voltage, the controller increases power delivery; when voltage drops, it reduces current to stay within allowable wire harness limits, thus achieving both high power capability and safety
Solution Approach 2:
The controller proactively monitors battery voltage and preemptively adjusts electric current supply before excessive current can flow. By detecting voltage drops in advance and reducing current accordingly, the system prevents harmful current levels while maintaining optimal display performance
Data Source
AI summary
A display apparatus includes a display and a controller. The controller is configured to receive, from the display, an arithmetic value for electric current consumption of the display; estimate the electric current consumption of the display based on the arithmetic value that was received; and when the estimated electric current consumption of the display is equal to or greater than a predetermined electric current threshold, decrease an electric current to be supplied to the display. The arithmetic value is calculated based on pixel value information.