Vehicle Head Unit Black Screen Detection Logic
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Solution Overview
Problem
Users face difficulties in identifying the source of a black screen issue when a user terminal malfunctions, leading to dissatisfaction and potential safety risks during driving, as the problem is not immediately recognizable between the vehicle head unit and user terminal.
Innovation Solution
A vehicle head unit equipped with decoding logic and black screen detecting logic that analyzes video stream data to determine if a frame corresponds to a black screen, notifies the user to reconnect or re-execute the user terminal if the black screen persists for a predetermined time, thereby distinguishing the issue from a vehicle head unit problem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle head unit displays video data from the user terminal, then the connectivity service is provided, but when the user terminal malfunctions, a black screen appears and the user cannot identify the error source
Solution Approach 1:
The vehicle head unit implements a feedback mechanism by continuously monitoring the video stream data from the user terminal and detecting black screen conditions. When a black screen is detected, the system provides feedback to the user through a notification message indicating that the user terminal may have an error, enabling the user to identify the error source without confusion
Solution Approach 2:
The black screen detecting logic acts as an intermediary between the video stream data and the display output. It intercepts and analyzes the video stream data before display, identifying black screen conditions and preventing misinterpretation by the user, thus mediating between the potential error in the user terminal and the user's perception
2Adaptability or versatility
If the user terminal and vehicle head unit are remotely connected through mobile communication network, then real-time location tracking is enabled, but the system complexity increases
Solution Approach 1:
The vehicle head unit implements multi-functionality by integrating both the connectivity service (video streaming from user terminal) and the remote connection service (location tracking through mobile network) within a single system. This universal approach allows the system to provide multiple services without requiring separate dedicated devices, thereby managing complexity while enhancing adaptability
3Measurement precision
If black screen detection is performed on the entire frame, then detection accuracy is improved, but CPU operation load and detection time increase
Solution Approach 1:
The black screen detecting logic segments the video frame analysis by checking specific lines or regions of the video stream data rather than analyzing the entire frame. This segmentation approach maintains sufficient detection accuracy while significantly reducing the computational load and detection time, thereby improving system productivity
Data Source
AI summary
The present disclosure provides a method of operating a vehicle head unit including a processor executing an application related to a connectivity service. In particular, the method includes: determining, by the processor, whether a current frame of video stream data transmitted from a user terminal corresponds to a black screen based on a line included in the current frame; determining, by the processor, whether the black screen continues for a predetermined time upon determining that the current frame corresponds to the black screen; and notifying, by the processor, that the user terminal needs to be re-connected or re-executed upon determining that the black screen continues for the predetermined time.