Electronic Mirror Brightness Control During Filter Transition
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Solution Overview
Problem
Conventional electrochromic mirrors face difficulties in maintaining viewability of images displayed behind a light control filter during its transition from a light reflection state to a light transmission state, due to the coexistence of reflected and transmitted light, which hinders the viewer's ability to see objects behind the filter.
Innovation Solution
An electronic mirror apparatus with a display unit, a light control filter, and a controller that adjusts the brightness of the image by controlling the backlight or gamma value of the display unit during the transition period, ensuring the image remains brighter than in the light transmission state, thereby preventing viewability degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light control filter transitions from light reflection state to light transmission state, then the filter transmits light better, but the image viewability behind the filter is degraded due to coexistence of reflected and transmitted light
Solution Approach 1:
The controller detects the transition state of the light control filter in advance and proactively adjusts the display brightness before the transition completes. By predicting the transition timing and pre-adjusting the display output, the system ensures continuous image viewability throughout the transition period, preventing the degradation that would occur during the state change.
Solution Approach 2:
The system dynamically changes the display brightness parameter based on the light control filter's transmission state. When transition is detected, the controller modifies the display parameters (such as backlight intensity or gamma correction) to compensate for the changing optical conditions, thereby maintaining optimal image viewability across different filter states.
2Reliability
If the display unit brightness is increased during transition period, then the image viewability is maintained, but the energy consumption increases
Solution Approach 1:
The system applies brightness adjustment periodically and temporarily only during the detected transition period of the light control filter, rather than maintaining high brightness continuously. The controller monitors the filter state and activates enhanced display output only when transition is detected, then returns to normal brightness afterward, thus maintaining image viewability during critical moments while minimizing overall energy consumption.
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 controller's brightness adjustment ensures clear image viewability during the transition period, preventing abrupt changes and maintaining optimal visibility for the driver, even when the light control filter is transitioning, thus enhancing the usability of the electronic mirror apparatus.
Implementation Method 1
The light control filter shifts between a light reflection state to reflect light and a light transmission state to transmit light in response to a state of voltage applied to the light control filter
Data Source
AI summary
An electronic mirror apparatus includes a display unit to display the image taken by an imaging unit mounted on a vehicle, a light control filter disposed at a side of the display unit nearer to a driver's seat, and a controller. The light control filter shifts between the light reflection state to reflect light and the light transmission state to transmit light in response to a state of voltage applied to the light control filter. The controller causes the display unit to display an image when the light control filter is in the light transmission state or in the period of transition from the light reflection state to the light transmission state. The controller performs control such that at least part of the image displayed on the display unit is brighter when the light control filter is in the period of transition than is in the light transmission state.