EVF Illumination Brightness Control for Disorientation Reduction
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Solution Overview
Problem
Users of digital still cameras with electronic view finders (EVFs) experience disorientation due to constant brightness differences between the EVF and ambient light, leading to discomfort and dizziness, as the EVF displays images with a luminance brighter than the ambient light, causing a significant luminosity difference.
Innovation Solution
An image display device with a control unit that adjusts the brightness of the illumination unit inside the finder window based on the brightness of the display unit, ensuring the luminosity difference is minimized by making the illumination unit brighter when the display unit is bright and dimmer when it is dark, and gradually increasing brightness if the finder window is continuously viewed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the EVF displays images with constant high brightness to improve image visibility, then the image display quality is improved, but the luminosity difference between the EVF and ambient light increases causing user disorientation
Solution Approach 1:
The patent applies dynamics by making the illumination unit's brightness adjustable rather than fixed. The control unit dynamically changes the illumination brightness based on detected ambient light conditions, allowing the system to adapt between high brightness for visibility and lower brightness to match ambient conditions, thereby resolving the contradiction between image visibility and user comfort
Solution Approach 2:
The patent changes the brightness parameter of the illumination unit based on ambient light detection. The control unit adjusts the illumination brightness parameter dynamically - increasing it when ambient light is low for better visibility, and decreasing it when ambient light is high to reduce luminosity difference and prevent user disorientation
2Illumination intensity
If the EVF brightness is increased to improve image visibility in dark environments, then the display quality is improved, but the luminosity difference between the EVF space and display unit increases causing discomfort
Solution Approach 1:
The patent applies local quality by providing non-uniform illumination distribution - the illumination unit specifically illuminates the space containing the liquid crystal screen with adjusted brightness, while other areas remain at ambient conditions. This localized illumination control allows the display area to have optimized brightness without creating excessive luminosity differences in the entire EVF space
Solution Approach 2:
The patent implements feedback through the control unit that detects ambient light conditions and automatically adjusts the illumination unit's brightness accordingly. This closed-loop control ensures that the illumination brightness adapts to match ambient conditions, preventing excessive luminosity differences and user discomfort while maintaining optimal display visibility
Data Source
AI summary
An image display device includes a display unit that is installed inside a finder window provided in a housing and displays images, an illumination unit that illuminates a space inside the finder window, and a control unit that when brightness of the display unit is a first brightness, sets the brightness of the illumination unit to a second brightness, and when the brightness of the display unit is a third brightness brighter than the first brightness, sets the brightness of the illumination unit to a fourth brightness brighter than the second brightness.