Passenger Display Shading With External Illumination Control
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Solution Overview
Problem
Existing shading devices for vehicle passenger displays fail to completely eliminate moving residual fragments visible to drivers when switched to shading mode, due to high contrast ratios between screen brightness and ambient brightness.
Innovation Solution
A shading device with a controlled illuminant, managed by a control unit, illuminates the passenger display externally to reduce contrast and make residual fragments less noticeable, using characteristic curves to adjust illuminant brightness based on display and ambient brightness, and incorporating an ambient light sensor and aperture to focus light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a view protection device is switched to shading mode to prevent driver view of the passenger display, then driver distraction is reduced, but moving residual fragments remain visible due to high contrast ratios between screen brightness and ambient brightness
Solution Approach 1:
The patent changes the lighting parameters by introducing an illuminant that modifies the ambient brightness around the passenger display. The control unit adjusts the illuminant's brightness dynamically based on the display brightness and ambient light conditions, thereby changing the contrast ratio parameters to eliminate residual fragment visibility while maintaining driver shading protection
Solution Approach 2:
The system implements feedback control by using an ambient light sensor to detect ambient brightness levels and using this information to dynamically adjust the illuminant brightness. The control unit continuously monitors display brightness and ambient conditions, adjusting the illuminant in real-time to maintain optimal contrast ratios and prevent residual fragment visibility
2Manufacturing precision
If the brightness of the passenger display is increased to improve image quality, then image quality improves, but residual fragments become more visible to the driver
Solution Approach 1:
The patent changes the ambient lighting parameters by activating the illuminant to increase surrounding brightness. This compensates for the high contrast created by bright display content, thereby reducing residual fragment visibility while allowing the display to maintain high brightness levels for optimal image quality
Solution Approach 2:
The illuminant acts as an intermediary element between the display and the driver's environment. It mediates the contrast issue by introducing additional ambient light that reduces the perceived brightness difference, allowing high display brightness to be maintained without increasing residual fragment visibility
3Object-affected harmful factors
If the brightness of the passenger display is decreased to reduce residual fragment visibility, then residual fragments become less visible, but image quality and screen visibility deteriorate
Solution Approach 1:
Instead of changing the display brightness parameter, the patent changes the ambient lighting parameter by activating the illuminant. This maintains the display brightness for good image quality while improving the ambient conditions to reduce residual fragment visibility
Solution Approach 2:
The patent addresses the contrast problem by introducing a new dimension - ambient illumination control - rather than simply adjusting display brightness. This additional degree of freedom allows independent optimization of both image quality (display brightness) and residual fragment visibility (ambient lighting)
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution minimizes driver distraction by ensuring residual fragments are not visible, maintaining high image quality and reducing glare for passengers across varying conditions, while being cost-effective and integrated into existing vehicle control modules.
Implementation Method 1
an illuminant oriented towards the passenger display and controlled by a control unit, which illuminant, in order to prevent moving residual fragments, illuminates the passenger display externally of the display
Implementation Method 2
the device comprises an ambient light sensor, wherein the control unit controls the brightness of the illuminant depending on the ambient brightness
Data Source
AI summary
A motor vehicle includes a passenger display with a switchable view protection device that is actively switched in predetermined operating states so that display contents shown on the passenger display cannot be seen from the seating area of the driver. The vehicle includes a shading device having an illuminant oriented toward the passenger display and is controlled by a control unit and which, in order to prevent moving residual fragments that can still be detected from the driver's seat despite a view protection device which is switched to shading, externally illuminates the passenger display.