CONOSCOPE LENS INTRODUCTION · Radiant Vision Systems | A Konica Minolta Company Fast, Accurate View Angle Measurement from Lab to Line CONOSCOPE LENS INTRODUCTION

Radiant Vision Systems | A Konica Minolta Company

Fast, Accurate View Angle Measurement from Lab to LineCONOSCOPE LENS INTRODUCTION

2Radiant Vision Systems | A Konica Minolta Company

© Radiant Vision Systems, LLC

TODAY’S TOPICS

• Measuring View Angle Performance of Displays• Radiant Conoscope Lens

• Accuracy and Repeatability• Instant Measurements• Minimal Equipment• From R&D to Production

• Competitive Comparison• Application Examples• Summary



MEASURING VIEW ANGLE PERFORMANCE OF DISPLAYS



WHY MEASURE VIEW ANGLE?

• View angle:Angle at which a display can be viewed with acceptable performance

• Displays appear in more commonly-used devices

• Displays increasingly integral to device function

• Quality of display impacts perceived quality of device

• Relative position of device to user is increasingly variable



COMMON APPLICATIONS

Televisions Phones, Tablets, PCs Smart Devices

Automotive Aerospace Virtual Reality



KEY FACTORS IN VIEW ANGLE PERFORMANCE

Luminance

• Brightness of a display should appear uniform to the human eye regardless of viewing position.

Chromaticity

• Colors of a display should appear the same regardless of viewing position.

Contrast

• Angular contrast (including brightness and color) of the display should be sufficient to ensure legibility of symbols and text against a background regardless of viewing position.



THE SOLUTION: CONOSCOPE LENSFast, Accurate View Angle Performance Measurement



CONOSCOPE LENS

Fast, Accurate, Low-cost View Angle Performance Measurement Solution for Displays



WHAT IS A CONOSCOPE?

• Transforms a directional distribution of light rays emanating from a single point (creating a cone) to a lateral distribution (all light rays parallel)

• Able to capture the entire visible “cone” of angular light rays on a single focal plane (image sensor in a camera)



WHAT IS A CONOSCOPE?

• Utilizes Fourier optics that map a light-emitting spot to a sensor so each pixel corresponds to a different emission angle

Imaging System



TOP VIEW ANGLE CONCERNS

1. Correlation of view angle data relative to human perception

2. Repeatability of measurement accuracy

3. Speed of measurement process

4. Cost & complexity of measurement equipment

5. Applying benchmark data from R&D to assess quality of displays in production



TOP VIEW ANGLE CONCERNS ADDRESSED BY CONOSCOPE LENS








SIMULATE HUMAN PERCEPTION

• Colorimeter simulates human perception of light and color

• Tristimulus filter system to CIE standard for absolute color values



SIMULATE HUMAN PERCEPTION

• Colorimeter simulates human perception of light and color

• Tristimulus filter system to CIE standard for absolute color values

Imaging Lens

Color Filters

ND Filters

Sensor











MEASUREMENT REPEATABILITY

• Evaluate with the same precision from display to display

• No movement of detector relative to display, preventing imaging inconsistency

• High performance imaging system• Luminance repeatability 0.02%











INSTANT MEASUREMENTS

• Conoscope lens solutions capture data for range of view angles in a single measurement

• No need to rotate detector or display, or take measurements from multiple angles

• Easy-to-use add-on to existing Radiant cameras











MINIMAL EQUIPMENT

• Conoscope is a single camera/lens solution

• Compact & turnkey form factor

• Easily integrated into labs and production lines with minimal setup and configuration

• Portable from lab to line











FROM R&D TO PRODUCTION

• Use the same conoscope lens system in the lab and on the line to capture and compare identical measurement data

• Characterize displays in the lab for engineering and development

• Use R&D data as benchmark during production for quality control

• Easily transition data files saved through common software environment

• Swap conoscope lens for other lenses to utilize photometer or colorimeter for other light & color measurements



CONOSCOPE SOLUTION FROM RADIANT VISION SYSTEMS

• Ensure display performance for all angles

• Mount to ProMetric Imaging Colorimeters & Photometers

• Simultaneously measure all angles to ±70°

• Angular resolution to ~0.05° per sensor pixel

• Working Distance = 3mm

• Fast, no need to rotate detector or device to capture spectrum of angular light

Colorimeter

Conoscope



COMPETITIVE COMPARISON

Compact camera/lens

Captures all angles in 1 measurement

No rotation of camera or display

Low-cost add-on to existing camera

Versatile: can be used with standard lenses for other display testing

Conoscope Lens

Multiple components

Measures 1 angle at each display rotation

Display must be rotated to each angle

Large and expensive

Single use

Goniometer

Multiple components

Measures 1 angle at each camera position

Robot must position camera at each angle

Large and expensive

Single use

Robot

Compact camera/lens

Captures all angles in 1 measurement

No rotation of camera or display

Low-cost add-on to existing camera

Large sampling area (undesirable)

Fisheye Lens



THE RADIANT ADVANTAGE

• Conoscope Lens + Camera Solution:

1. Perform view angle measurements:

• Conoscope lens mounted to photometer or colorimeter

2. Perform other 2D measurements:

• Remove conoscope lens and utilize full selection of standard Radiant lenses

3. Same ProMetric® Software tools for recording millions of data points

Colorimeter with conoscope lens

Colorimeter without conoscope lens



APPLICATION EXAMPLESConoscope Lens Images and Analysis



LCD DISPLAYS

angleangle



CONOSCOPE ON LCD TABLET

Chromaticity:



OLED DISPLAYS

• Δu’v’ varies from device to device, same manufacturer

Δu’v’, horizontal cross-section Δu’v’, vertical cross-section

NOTE: These images were taken with a Lens model that had +/- 58° field of view. Our current FPD Conoscope Lens extends to +/- 70°



EMBEDDED DISPLAYSView Angle Measurement: Display Contrast



Contrast of text at at view angle

Contrast of text at view angle

EMBEDDED DISPLAYSView Angle Measurement: Display Contrast



CONOSCOPE ON MONITORViewing cone light distribution results.

Monitor

Monitor with privacy screen

Red Green Blue



CONOSCOPE ON LCD TABLETEquivalent measurement data as compared with goniometer.



SUMMARY

The ability to clearly view displays from multiple angles is critical to operating devices with increasingly variable position to user

New display technologies and integrations demand greater control over view angle performance

A conoscope lens instantly captures light and color from all view angles of a display in a single measurement without moving the camera or device

Radiant’s conoscope lens offers the advantage of speed, size, and software well-suited for production lines

Paired with an imaging photometer or colorimeter, the conoscope lens is a fast, accurate, and cost-effective view angle measurement solution



Working closely with world class brands and manufacturers to deliver creative visual inspection solutions that improve

quality, reduce costs, and increase customer satisfaction.

Radiant Vision Systems | A Konica Minolta CompanyRadiant Vision Systems | A Konica Minolta CompanyQuestions? Contact [email protected]

THANK YOU!

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CONOSCOPE LENS INTRODUCTION · Radiant Vision Systems | A Konica Minolta Company Fast, Accurate View Angle Measurement from Lab to Line CONOSCOPE LENS INTRODUCTION

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