Automotive Display System Black Screen Control for Abnormality
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Solution Overview
Problem
In a display system mounted on an automobile that displays multiple screens, existing solutions fail to reliably set only the abnormal screen to a black display without affecting non-abnormal screens, and this reliability is compromised when the abnormality detection system itself fails.
Innovation Solution
A display system with a rendering unit, a display unit, a black screen display control unit, and an abnormality monitoring unit that sets a black screen for abnormal screens at a shorter interval than the detection time, using a timer counter and abnormal flags to manage the display state, ensuring only abnormal screens are displayed in black, even if the detection fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire display screen is set to black by turning off the backlight, then functional safety is achieved, but non-abnormal screens are also displayed in black which is not preferable
Solution Approach 1:
The display screen is divided into multiple independent screen regions, each with its own abnormality detection and black screen control. This allows selective black screen application to only abnormal regions while keeping normal regions visible, resolving the contradiction between functional safety and information display.
2Ease of manufacture
If software processing is used for rendering black screens, then implementation is simple, but reliability of functional safety is not sufficient
Solution Approach 1:
A dedicated black screen display control unit is introduced as an intermediary component between the abnormality detection and display output. This separate hardware unit ensures reliable black screen execution independent of software rendering, while still maintaining system simplicity through dedicated functional modules.
3Device complexity
If only one detection system is used, then device complexity is low, but reliability is compromised when the detection system itself fails
Solution Approach 1:
The abnormality monitoring unit continuously monitors system status and proactively triggers black screen display upon detecting abnormalities. This preliminary action ensures safety before potential failures propagate, while the dedicated control unit provides backup functionality independent of the detection system's operational status.
4Speed
If black screen is displayed immediately upon abnormality detection, then functional safety response is fast, but false blackouts may occur due to detection failures
Solution Approach 1:
The system implements feedback control where the black screen display control unit receives continuous abnormality detection signals and adjusts black screen display accordingly. The display unit provides visual feedback to confirm abnormality status, allowing verification before permanent black screen activation, thus preventing false blackouts while maintaining fast response to genuine abnormalities.
Data Source
AI summary
One form of a displaying unit combines a first screen, a second screen, and a third screen generated by a rendering unit so as to be arranged in a horizontal direction, and displays the combined screens on a display unit. A timer counter circuit causes the abnormality monitoring unit to set the black screen layer ON of the screen in which normality of each part related to the screen cannot be detected at a time interval shorter than a predetermined time, and the displaying unit displays the screen in a black screen by superimposing and displaying a black screen layer on the screen in which the black screen layer of being ON has been set.