Vision Contrast Test System with Ambient Light Sensor Calibration

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Solution Overview

Problem

Current computerized vision contrast tests using LCDs face issues due to the intrinsic inconstancy of display brightness and uncontrolled ambient illumination, leading to unreliable results as the calibration of LCDs and environmental lighting are not precise or adjustable.

Innovation Solution

A system that integrates a standard low-cost computer with a display device, equipped with an illumination sensor, a color-detection sensor, and a microcomputer to continuously adjust and calibrate the display's emission to match ambient conditions, ensuring consistent illumination and brightness for reliable visual acuity tests.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If LCD display is used for computerized vision contrast tests, then test automation and efficiency are improved, but display brightness constancy and calibration reliability deteriorate

Engineering Contradiction:

Improvetest automationVSAvoiddisplay brightness constancy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system incorporates sensors that continuously measure ambient illumination levels and display brightness, feeding this information back to a control unit that automatically adjusts display parameters to maintain constant luminance ratios between display and environment, thereby resolving the brightness constancy issue while preserving automation

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The display system performs self-calibration by using integrated sensors to autonomously monitor and adjust its own brightness output based on measured ambient conditions, eliminating the need for manual periodic calibration and ensuring reliable performance

Inventive Principle:

Principle #25Self-service

2Stability of the object's composition

If manual control of ambient light is used in conventional optotype tests, then illumination constancy is improved, but measurement precision and adaptability to optimal illumination levels deteriorate

Engineering Contradiction:

Improveillumination constancyVSAvoidillumination level precision

Core Design Contradiction:

Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The system replaces manual mechanical control of ambient lighting with an automated electronic control system that uses sensors to precisely measure illumination levels and automatically adjusts lighting to maintain optimal and constant conditions, thereby improving both precision and adaptability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system dynamically adjusts illumination parameters based on measured environmental conditions, changing brightness levels automatically to maintain optimal viewing conditions and precise measurement accuracy throughout the test

Inventive Principle:

Principle #35Parameter changes

3Reliability

If periodic calibration of LCD is performed, then basic brightness yield is improved, but time consumption and operational complexity increase

Engineering Contradiction:

Improvebrightness calibrationVSAvoidcalibration time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs continuous self-calibration using integrated sensors that autonomously monitor display output and ambient conditions, automatically adjusting parameters to maintain accurate brightness levels without requiring periodic manual intervention or calibration procedures

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Instead of periodic calibration, the system implements continuous automatic calibration throughout operation, ensuring brightness accuracy is maintained at all times without interrupting test workflows or consuming additional calibration time

Inventive Principle:

Principle #20Continuity of useful action

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 system enables real-time adjustment and calibration of display settings to maintain consistent test conditions, eliminating the need for periodic calibration and ensuring reliable and efficient visual acuity testing regardless of ambient changes.

Implementation Method 1

the display is equipped with an illumination sensor, a color-detection sensor, and a microcomputer

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Implementation Method 2

the display is equipped with an illumination sensor, a color-detection sensor, and a microcomputer

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Data Source

PatentUS8596793B2Method for the optimization of the conditions of execution of the vision contrast test, and corresponding system

Publication Date: 2013.12.03 S I F I SPA

AI summary

Described herein is a method for optimization of the conditions of execution of the vision contrast test and the corresponding system with which to implement said method so as to be able to guarantee optimal conditions throughout the test session even when not it is not possible to respect the standards. Furthermore, the method comprises a self-calibration procedure, which definitively eliminates the operations of calibration of the system by specialized centers.