Optotype Display Apparatus Reducing Light Leakage
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Solution Overview
Problem
Conventional optotype presenting apparatuses of the display type face challenges in accurately performing polarization red-green tests due to light leakage, which affects the accuracy of binocular balance and refractive power correction assessments.
Innovation Solution
An optotype presenting apparatus with a display, a polarization optical member, and a controller that alternately arranges optical regions on the display to ensure light with perpendicular polarizing axes is presented to each eye, while controlling the display to show white regions where necessary to prevent unintended light perception, thereby enhancing test accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polarization optical member is placed in front of the display to present different optotypes to right and left eyes, then binocular vision testing is enabled, but light leakage occurs between adjacent optical regions causing unintended light perception
Solution Approach 1:
The patent converts the harmful light leakage into a beneficial effect by intentionally displaying white regions in the gaps between optical regions. This white display compensates for the leaked light, ensuring that only the intended optotypes are perceived by each eye while maintaining the polarization separation function.
Solution Approach 2:
The patent changes the display parameter from black background to white background in specific regions. By controlling the display to show white in the gaps between polarization optical regions, the system compensates for light leakage and maintains proper optical separation without requiring complete light blocking.
2Reliability
If black regions are displayed in the gaps between optical regions to block light, then optical separation is improved, but unintended optotypes become faintly visible due to light leakage
Solution Approach 1:
Instead of using black regions to block light (which causes unintended optotypes to become faintly visible due to leakage), the patent uses white regions to actively compensate for the leaked light. This converts the harmful light leakage into a beneficial compensation mechanism, ensuring clear and accurate optotype perception.
Solution Approach 2:
The patent changes the display brightness parameter from black (0 brightness) to white (maximum brightness) in the gap regions. This parameter change allows the system to compensate for polarization-induced light leakage, ensuring that only the intended optotypes are clearly visible to each eye while maintaining reliable optical separation.
3Adaptability or versatility
If polarization filters with perpendicular axes are used to separate optotypes for each eye, then binocular balance testing is enabled, but light leakage prevents accurate refractive power assessment
Solution Approach 1:
The patent converts the harmful light leakage from polarization filter separation into a beneficial effect by displaying white regions in the gaps. This white display compensates for the leaked light, ensuring that refractive power assessment remains accurate while maintaining binocular balance testing capability.
Solution Approach 2:
The patent changes the display brightness parameter in gap regions from black to white, which compensates for light leakage caused by polarization filter separation. This ensures that refractive power assessment accuracy is maintained while enabling binocular balance testing with perpendicular polarization axes.
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 allows for precise presentation of optotypes to each eye, reducing light leakage and improving the reliability of polarization red-green tests, enabling accurate binocular balance and refractive power assessments.
Implementation Method 1
a polarization optical member placed in front of the display which includes first optical regions and second optical regions which are alternately arranged in either one of a linear pattern and a grid pattern based on the size of pixels of the display, the first optical regions changing light exiting from the display into light having a polarizing axis, the second optical regions changing light exiting from the display into light having a polarizing axis, the polarizing axes being perpendicular to each other
Data Source
AI summary
An optotype presenting apparatus of a display type with which a polarization red-green test with accuracy can be performed has a display, a polarization optical member including first and second optical regions changing light from the display into light having perpendicular polarizing axes, a selector, regions where optotypes for left and right eyes are to be presented, and a controller, wherein, when a polarization red-green test chart is selected with the selector, the controller controls the display to display a left-eye polarization red-green optotype in pixel regions corresponding to the first regions within the left-optotype-presenting region and display pixel regions in white corresponding to the second regions within the left-optotype-presenting region, while the controller controls to display a right-eye polarization red-green optotype in pixel regions corresponding to the second regions within the right-optotype-presenting region and display pixel regions in white corresponding to the first regions within the right-optotype-presenting region.