Optimizing vehicular displays for the ambient light conditions they will be used in – from dark nights to sunny days and everything in between – requires a delicate balance of settings based on carefully obtained metrics.

Camera Monitor Systems (CMSs), for example, for backup cameras or mirror replacements, become increasingly important and already cover safety aspects such as guaranteed latency and no frame freeze. Today's approaches deal only with supervision of the digital interface, LCD backlight, and power supply. This paper introduces methods for advanced safety monitoring of panel electronics and optical display output that aim to enable future CMS based automotive use cases. Our methods are based on correlation of physical measurements with predicted values derived from a corresponding display model. This model was made via calibration measurements and many test patterns. Correlation of the monitoring results with predicted values corresponds to the probability that the RGB data are shown as intended. This implies that an overlying system, an Automotive Safety Integrity Level (ASIL) Prepared Video Safety System (APVSS), ensures that only safety verified RGB data are provided to the panel electronics. In case of failures, our methods enable a safe system state, for example, by deactivating the panel. An additional challenge is to allow graceful degradations, a safe but slightly degraded image may provide a better customer experience compared with no information. We successfully verified our approach by a fully functional prototype and extensive evaluation towards "light-to-light" (camera to display output) supervision.

A contrast enhancement extension named as LSF Correlator has been amended to our Sorted Sector Covering (SSC) algorithm for the calculation of the LED duty‐cycles of a local dimming LED backlight. As a result, the static contrast of the display is significantly increased. The LSF Correlator has been proved on an 8″ WVGA prototype with an edge‐lit backlight.

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