Finder Display Control for Variable ND Filter Transmittance
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Solution Overview
Problem
The visibility of an imaging apparatus' display is compromised when using an electronic variable ND filter due to its slow operating speed, causing reduced visibility during transmittance switching, especially in bright environments where the display blends with the background.
Innovation Solution
Incorporating a transmittance measurement unit and a display device light amount control unit to continuously measure and adjust the light amount of the display device, maintaining a constant light ratio with the optical image, even during transmittance changes of the electronic variable ND filter, ensuring consistent visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an electronic variable ND filter is used to adjust light amount in bright environments, then the display visibility is improved, but the slow operating speed causes reduced visibility during transmittance switching
Solution Approach 1:
A transmittance measurement unit continuously measures the actual transmittance of the electronic variable ND filter in real-time. The display device light amount control unit receives this measurement feedback and dynamically adjusts the display light amount to maintain appropriate visibility throughout the switching process, compensating for the slow response of the ND filter.
Solution Approach 2:
The transmittance measurement unit acts as an intermediary between the electronic variable ND filter and the display device control system. It provides real-time transmittance data that enables the control unit to mediate the relationship between the slow-switching ND filter and the display visibility requirements.
2Adaptability or versatility
If the transmittance of electronic variable ND filter is switched to adapt to external light conditions, then the display visibility in bright environments is improved, but the visibility is reduced for a certain period during switching
Solution Approach 1:
The system continuously monitors the actual transmittance of the ND filter and feeds this information back to the control unit. This feedback mechanism ensures that the display light amount is dynamically adjusted to maintain stable visibility throughout the switching process, regardless of the slow response time of the ND filter.
Solution Approach 2:
The transmittance measurement unit begins measuring the ND filter transmittance before and during the switching process, allowing the control unit to proactively adjust the display light amount in advance and maintain visibility stability throughout the transition.
3Illumination intensity
If the light amount of the display device is increased to improve visibility, then the display becomes more visible, but the light amount ratio between optical image and display becomes unbalanced
Solution Approach 1:
The control unit receives real-time feedback on the actual transmittance of the ND filter and dynamically adjusts the display light amount to maintain a constant light amount ratio between the optical image and the display. This feedback control ensures balanced visibility without manual intervention.
Solution Approach 2:
The system transitions from static display light amount control to dynamic control that automatically adapts to changing ND filter transmittance. The display light amount is continuously adjusted in real-time to maintain the appropriate light ratio balance as the ND filter switching occurs.
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
This solution maintains favorable visibility of the display in the imaging apparatus by adjusting the display device's light amount based on real-time transmittance measurements, mitigating the impact of slow transmittance switching in electronic variable ND filters.
Implementation Method 1
an electronic variable ND filter that is disposed in an optical path of the optical finder so as to adjust a light amount of the optical image of the subject incident into the superimposing optical element
Implementation Method 2
a superimposing optical element that is disposed in an optical path of the optical finder so as to superimpose display of the display device on the optical image of the subject observed through the optical finder
Data Source
AI summary
Provided are an imaging apparatus capable of maintaining favorable visibility of display in a finder, a finder display control method of the imaging apparatus, a finder display control program of the imaging apparatus, and a viewfinder. The viewfinder (30) includes an observation optical system (32), a finder LCD (36), a beam splitter (34) that superimposes display of the finder LCD (36) on an optical image of a subject observed through the observation optical system (32), an electronic variable ND filter (40) that adjusts a light amount of the optical image of the subject incident into the beam splitter (34), a transmittance measurement unit (90) that measures the transmittance of the electronic variable ND filter (40) changing over time in a case where the transmittance of the electronic variable ND filter (40) is switched, and a finder LCD display control unit (110b) that controls the light amount of the display device in real time on the basis of the result of measurement of the transmittance measurement unit (90). The finder LCD display control unit (110b) controls the light amount of the finder LCD (36) so as to keep constant a light amount ratio of the optical image of the subject observed through the observation optical system (32) and the display of the finder LCD (36) superimposed on the optical image.