Eldim

Light and Color Measurement

Instruments

Market Tech, Inc.7/21/2011

Market Tech

Distributor of light sources and instruments for generation and measurement of light and color.

Instruments manufactured by:

Eldim

X-Rite

Based in Scotts Valley, CA

1931... The C.I.E.

Guild and Wright characterize the visual response of the human eye.

222°°°222°°°

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Mapping the human response

RedRed

GreenGreen

BlueBlue

Test Lamp!Test Lamp!

White ScreenWhite Screen

Masking ScreenMasking Screen

ObserverObserver

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222°°°

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1931 x, y Chromaticity Diagram

A Methodology for specifying Color based on CIE sources, observers and coordinate system developed by the International Commission on Illumination

The CIE System

The CIE Illuminant

The CIE coordinates

Spectral power distribution representing a standard source of illumination which may be real or hypothetical.

Proportions of standard primaries required for color match (tristimulus values).

CIE

Radiometry

The measurement of energy per time

Radiant power

Radiant flux

Radiance

Irradiance

Photometry

The measurement of optical quantities related to the human eye

Luminous flux

Luminous intensity

Luminance

Illuminance

Dominant Wavelength

Color Temperature

Colorimetry

CIE XYZ

CIE L*a*b*

CIE L*C*h°

What Illuminant?

What Observer?

Color Control - Colorimetry

Mimics the eye

CIE measurements

XYZ

L*a*b*

LCH

Light and Light and ColorColor Measuring Measuring Instruments* Instruments* -- EldimEldim

Single point viewing angle systems

2D systems for uniformity

Temporal analysis instruments

Multispectral systems

*One instrument can not complete all types of measurements.

Eldim Viewing angle systems

The viewing angle systems allow the user to measure viewing angle and analyze Chromaticity, Luminance, Illuminance, Contrast Ratio, Correlated Color Temperature, Elipticity, Degree of Polarization and Orientation.

Includes EZ Contrast and VC Master 3D

Eldim 2D uniformity systems

The Uniformity series products are 2D imaging colorimeters that can measure and analyze Chromaticity, Luminance, Illuminance, Luminous intensity, Radiance, Irradiance, Radiant Flux, Contrast Ratio, Correlated Color Temperature, Elipticity, Degree of Polarization and Orientation.

Includes Umaster and Mura Test

Eldim temporal analyzer

The Temporal Analyzer series of instruments provide temporal and luminance measurements, including the ability to make MRPT measurements as well as Gamma curves and Flicker measurements.

Optiscope

Eldim Multispectral systems

The MS Color 32 is an Imaging spectrophotometer used to analyze the emission homogeneity of liquid crystal displays.

O ti l h t i ti f t t i dOptical characterization of auto-stereoscopic and stereoscopic 3D displays

ELDIM, 1185 rue d’Epron, 14200 Hérouville St Clair, France

Tel : 33 2 31 94 76 00

March, 2011 Slide #1

Introduction

Plasma TVs

Phones3D photographyMonitor displaysPlasma TVs

LCD TVsLCD TVs

Monitor displays

LCD TVs

Passive glass3D displays

Auto-stereoscopic 3D displays

Active glass 3D displays


=> ELDIM address the three types of displays

Introduction

display displaydisplay display

Quarter wavelength filter

display

Lens or barriers

display

Left image + Right image

1 7

Polarizer glasses 2 3 4 6

Left eye Right eye

Passive glass3D display principle

Left eye Right eye

Auto-stereoscopic 3D display principle

Active glass 3D display principle

Need of viewing angle Measurements with

high angular resolution

Need of viewing angle Measurements with

Polarization state

Need of grey level dependent crosstalk

Measurements


⇒Measurement requirements are different

Introduction

TWO MAIN METHODS TO CHARACTERIZE DISPLAY EMISSIONLocal measurement: viewing angle emission

TWO MAIN METHODS TO CHARACTERIZE DISPLAY EMISSION

Gobal measurement: homogeneity measurement


=> The two methods can be applied to each 3D display type

Introduction

Display Type Viewing angle measurement Homogeneity measurement

VCMaster3D Binocular imaging2008

Auto-stereoscopic High angular resolutionColor & Luminance

Binocular imaging Under development

Passive glassEZContrastMS

Radiance versus wavelengthUMasterPZ

Radiance at 3 wavelength2010 2010

Passive glass Radiance versus wavelengthStokes vector

Radiance at 3 wavelengthStokes vector

Temporal measurement Homogeneity measurementTemporal measurement Homogeneity measurement

Active glassOPTISCOPE

Response time vs GLsFull emission model

UMasterCrosstalk vs GL transitionsTemporal synchronization

2006 2010

ELDIM offers different solutions for each type of 3D display


Characterization of auto-stereoscopic displays

R i t f i i l tD

Requirements for viewing angle measurements

Left and right eyes see different images

d

θ Δ

We must be able to predict the light going inside left and right eyes of the observer

Δx

Angular resolution Δθ produce an uncertainty Δx in the plane of the observer

Δx is always higher than D tan Δθ


Δx is always higher than D tan ΔθΔx must be lower than the iris diameter


100

Observer distance (mm)350

700

10

erta

inty

(mm

) 1400

2100

1

Posi

tion

unce

Typical resolution for

spectrophotometer

Min pupildiameter

0.1

spectrophotometer

0.03° angular resolution is sufficient for all situations

0.10.01 0.1 1 10

Angular resolution (deg)



di l

Fourier Plane

Field LensFourier Plane

Field Lens

display

SensorCCD

Sensor

Iris

Relay Lens

Lens

Relay Lens

Color filters

Polarizer filter LensPolarizer filter

All angles measured simultaneouslyIndependent control of the angular aperture and the spot size


Independent control of the angular aperture and the spot sizeUltra-high angular resolution with big CCD and dedicated optics


The Fourier optics viewing angle system VCMaster-3D is dedicated to auto-

stereoscopic 3D display characterization

Field Incidence angleAzimuth angle

±50°0-360°

Measuring area Maximum diameter 4mmWorking distance Optimal for fixed spot

position15mm

AccuracyLuminance ±3%Angular resolution (deg) <0.03°


LuminanceChromaticity

±3%0.005 (for any stimulus)


One location on the display is characterized by its coordinatesOne location on the display is characterized by its coordinatesThe observer is characterized by its position and by the interpupillar distanceThe eyes are assumed parallel to display horizontal

We compute the contrast for the left and right eyes for an


observer located in the transverse, sagittal or coronal planes


Twin view notebook display

Luminance contrast for the left and right eyes in Fourier space


g y p


Twin view notebook displaynotebook display

=> It defines a=> It defines a Qualified

Binocular Viewing Space QBVS for p Qcentral location


Calculation of 3D contrast for the central location


We measure at 3 different locations along horizontal

Small horizontal shift to optimize viewing space


Twin views 16” parallax barrier notebook display


3D contrast computed in the transversal plane for the twin view 3D notebook display using 3 different formulas


view 3D notebook display using 3 different formulas


Twin view notebook displaynotebook display

=> It defines a=> It defines a Qualified

Binocular Viewing Space QBVS for p Qthe 3 locations

Calculation of 3D contrast for the three locations


Calculation of 3D contrast for the three locations (center, right and left sides)


Twin view notebook display

C l l tCoronal planes at different distances

from the display


Characterization of auto-stereoscopic displaysTwin view

notebook display

1 location 3 locations

3D contrast calculated on a 400x400x800mm box size for central measurement location and 3 measurement


locations


42”Lenticular lenses 3D TV42 Lenticular lenses 3D TV


3D contrast of view 1 for central location


3D contrast for view 1 on axis

3D contrast for view 2 tilted

Combine 3D contrast with modulation

due to l i


overlapping

42”Lenticular lenses 3D TV


3D contrasts of a parallax barrier 14parallax barrier 14 views phone cell display in the transversal planep


Overview

Display type Measurements Characteristics

Auto-t i

High resolution i i l

QMVS & QBVS

Crosstalk i

Moiré effectC l hiftstereoscopic viewing angle QBVS maximum Color shifts

Passive glass

Multispectral polarization

viewing angle

QMVS & QBVS

Crosstalk maximum

Moiré effectColor shiftsPassive glass

stereoscopicviewing angle

Polarization imaging

Polarization homogeneity Color shifts

Active glass stereoscopic

Temporal Response time vs grey level transitions

Shutter glass transmittance

Video-luminance Luminance Crosstalk TemporalVideo luminance meter

Luminance levels vs grey

levels

Temporal synchronization

March, 2011

Overview

VCMaster3D EZContrastMS UMaster Optiscope SA

Auto Passive glassAutostereoscopic

Passive glass

Active glass

March, 2011

Overview

Each type of stereoscopic display requires different optical characterization

High angular resolution viewing angle measurements are applied to auto-stereoscopic displays

Multispectral polarization viewing angle and imagineMultispectral polarization viewing angle and imagine polarization measurements are used for passive glass stereoscopic displays

Active glass stereoscopic displays are measured versusActive glass stereoscopic displays are measured versus grey level on both eyes using temporal analyzer and video luminance-meter.

March, 2011

Complete Light and Color Measurement Solutions

Paint

Plastics

Displays

LED’s

E-Ink devices

Liquids

Inks

Eldim

Documents

d systems

eldim viewing angle

d uniformity systems

d tan x

d displayseldim

d displaymarch

d display typemarch

eldim multispectral