Optotype Display Luminance Control for Polarized Binocular Vision
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Solution Overview
Problem
Conventional optotype presenting apparatuses reduce the brightness of optotypes for each eye by half due to the division of display regions and the use of polarizing filters, leading to inaccurate examinations.
Innovation Solution
An optotype presenting apparatus with alternately arranged left and right eye display regions having orthogonal polarization axes, and a controller that adjusts display luminance based on the type of optotype, allowing for accurate presentation of optotypes by embedding luminance information in the image signal or using separate luminance changing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display region is divided into left eye and right eye optotype display regions with orthogonal polarization axes, then different optotypes can be presented to each eye for binocular visual tests, but the brightness of optotypes is reduced by half
Solution Approach 1:
The patent employs time-division multiplexing to dynamically switch between presenting optotypes to the left eye and right eye. The display device alternates between showing optotypes polarized for the left eye and optotypes polarized for the right eye at different time intervals, allowing full brightness to be maintained for each eye while still enabling binocular visual tests.
2Adaptability or versatility
If a polarizing filter is placed in front of the eyes to enable stereoscopic vision, then binocular visual tests can be performed, but the brightness of optotypes is further reduced
Solution Approach 1:
The system dynamically controls the display to present optotypes with appropriate polarization orientation at different time intervals. By synchronizing the display output with the polarizing filter configuration, the system ensures that when the left eye polarizing filter is active, the display shows optotypes optimized for left eye viewing, and vice versa, thereby maintaining maximum brightness while enabling binocular tests.
3Adaptability or versatility
If darker optotypes are used in examinations to accommodate the reduced brightness, then the display can function with divided regions and polarizing filters, but the accuracy of examinations deteriorates
Solution Approach 1:
The system dynamically adjusts the display output to present optotypes at full brightness by utilizing time-division multiplexing. Instead of using darker optotypes, the display switches between presenting optotypes for the left eye and right eye at different time intervals, ensuring that each optotype is displayed at maximum brightness when its corresponding polarizing filter is active, thereby maintaining examination accuracy.
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
Enables accurate eye examinations by ensuring suitable brightness for each eye, enhancing the accuracy of visual tests and reducing the need for additional equipment or communication instruments.
Implementation Method 1
left eye optotype display regions that output light having a first polarization axis and right eye optotype display regions that output light having a second polarization axis orthogonal to the first polarization axis
Data Source
AI summary
An optotype presenting apparatus that is capable of carrying out examinations accurately is provided. An optotype presenting apparatus includes a display and a controller. The display includes left eye optotype display regions and right eye optotype display regions. The left eye optotype display regions output light having a first polarization axis. The right eye optotype display regions output light having a second polarization axis orthogonal to the first polarization axis. The left eye optotype display regions and the right eye optotype display regions are alternately arranged along pixel lines. The controller is capable of displaying a plurality of optotypes selectively on the display. Further, the controller controls the display based on a type of an optotype displayed on the display to change display luminance.