Understanding the Requirements for Automotive Displays in Ambient Light Conditions

Abstract

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.

Solving Challenges and Improving the Performance of Automotive Displays

“…1 demonstrates how the display appears to the driver in 2 lux and 21K lux (first row) and how using our application in dark and bright conditions can clarify important details presented on the screen. DRIVEvue dark and bright modes use similar algorithms but consider the differences between human contrast sensitivity and color perception in dark 5,7,8 and bright 2, 3, 4 environments. This approach consists of three major algorithms: global contrast retargeting, local contrast retargeting, and color retargeting 5 .…”

52‐3: Optical Properties of Anti‐Reflection and Anti‐Glare Surface Treatment on the Cover Glass for Auto‐Interior Applications

“…Following ISO15008 standards and [2] we have evaluated the ambient contrast ratios of our surface treatments. We have measured BRDF and reflectivity to calculate contrast ratio CR S and CR D as defined in [2] for a display brightness of 800 nits and display stack reflection of 4% in Limits are those established in [2].…”

“…In figure 5 and 6, we have calculated CR D and CR S to evaluate the required conditions to meet ambient light contrast ratio requirements defined in [2] and shown with dashed lines. We have reported the range where our surface treatment operates.…”

Automatic luminance control summarized

“…The biometric light sensor method has the potential to replace not only the forward looking light sensor, but also the light sensors associated with all the in‐vehicle displays such as the center information display(s) and the instrument cluster. In addition, the biometric light sensor has the potential of detecting the veiling glare that is “scattered in the lens and the vitreous body of the human eye.” In order to use the observer's pupil diameter to determine the observed luminance, one model is the unified formula per Equation 8‐1 as plotted in Fig. .…”

“…In addition, the biometric light sensor has the potential of detecting the veiling glare that is "scattered in the lens and the vitreous body of the human eye." 27 In order to use the observer's pupil diameter to determine the observed luminance, one model is the unified formula per Equation 8-1 28 as plotted in Fig. 22.…”