Vehicular Display Power Failover Using Dual DC Supply Paths
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicular display systems face issues with power supply reliability due to dependent failure when the head unit fails, leading to display device malfunction and increased complexity and cost with the addition of a microcontroller unit (MCU) for power management.
Innovation Solution
A display control apparatus and method that utilizes a head unit with a DC voltage generator to output multiple DC voltages, monitored by a voltage detector, and a display device with ORing circuits to independently manage power, allowing safe and efficient operation even in head unit failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power is supplied to the display device through the head unit, then the display device can be controlled centrally, but the display device fails when the head unit fails (dependent failure)
Solution Approach 1:
The power supply system is segmented into two independent paths: one through the head unit for controlled operation, and another direct power supply path for fail-safe operation. This segmentation allows the display device to maintain operation even when the head unit fails, resolving the dependent failure issue while preserving centralized control capabilities when the head unit is functional.
2Reliability
If a microcontroller unit (MCU) is added to the display device for independent power control, then reliability improves, but device complexity and cost increase
Solution Approach 1:
The display device is designed to autonomously detect head unit failure conditions and automatically switch to direct power supply mode without requiring an MCU for complex decision-making. This self-service approach maintains reliability through simple, automatic failover while avoiding the complexity and cost of adding an MCU to the display device.
3Reliability
If a direct power supply path is added to the display device, then reliability improves, but device complexity increases
Solution Approach 1:
The direct power supply path uses simple, inexpensive circuitry that can be easily implemented without complex power management components. The approach accepts minimal additional complexity in exchange for significant reliability improvement, treating the power management addition as a straightforward, low-cost enhancement rather than a complex system modification.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A display control apparatus includes a head unit configured to output an image signal and a control signal, and a display device configured to receive the image signal and the control signal and output the image signal. The head unit may include a direct current (DC) voltage generator configured to output at least two types of DC voltages, and the display device may include a circuit configured to generate an output signal based on a first input signal and a second input signal. A display control method includes outputting, by a head unit, an image signal and a control signal, outputting, by a DC voltage generator in the head unit, at least two types of DC voltages, receiving, by a display device, the image signal and the control signal and outputting the image signal, and generating, by the display device, an output signal based on a first input signal and a second input signal.