new generation of imaging colorimeters and spectrophotometers

EXHIBITOR FORUM, SID 2012 Slide #1June 6, 2012

Pierre BOHERELDIM, 1185 rue d’Epron, 14200 Herouville St Clair, France

Tel : 33 2 31 94 76 00Email: [email protected]

New generation of imaging colorimeters and spectrophotometers

Slide #2EXHIBITOR FORUM, SID 2012June 6, 2009

Agenda

1. Imaging optics

2. Luminance & Colorimetry => UMaster

3. Polarimetry => UMasterPz

4. Multispectral imaging => UMasterMS

5. High spatial resolution => Additional optics

6. Ultrahigh spatial resolution => MVP

7. Normal incidence measurements => TTO optics


Sensor

Classic Lens Diameter D

Focal F#Object

F1F2, L

dS2

dS1

2θ2

Imaging optics: why telecentric optics ?

12

1 dS)F

#F21(Md −=φ ∞

First order dependence with distance

Flux collected by one element surface of detector

Standard imaging objective

Flux reduction versus working distance


Imaging optics: why telecentric optics ?

First order dependence with distance

Flux collected by one element surface of detector

Telecentric imaging objective on sensor side

Flux reduction versus working distance

SensorTelecentric

lensFocal F#

ObjectEntrance

Pupil

F# F2,L

dS2

dS1

2θ2

122

2

1 dS)F16#F31(Md −=φ ∞


Display

Diaphragm

Color Filters

CCD sensor

UMaster imaging colorimeterLuminance or color measurements High resolution & high sensitivityLow stray lightEntrance iris comparable to human

pupilPolarization state measurements

Imaging colorimetry : UMaster


Imaging colorimetry : UMaster

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

400 450 500 550 600 650 700

Res

pons

e

wavelength (nm)

5 filtres

CIE

Each system is matched closely with the CIE curves !


Definition of the ellipticity ε=tan(b/a)

Y

X

X’α

Y’ ε

Ex

Ey

b

a

χ

t np pE = E + E

2 2x y p

t t

E E II I

ρ+

= =

Degree of polarization ρ

2² ² 2 cos sin² ²x y x y

X Y XYE E E E

ϕ ϕ+ − =The electric field can be separated in two parts:

To define completely the light polarization state we need: oThe polarization direction α

oThe ellipticity ε=tan(b/a)

o The degree of polarization ρ

PolarizedUnpolarized

Imaging polarimetry : UMasterPZ


The system makes automatically the following measurements for a given wavelength :

3 measurements with 3 polarizer orientationsM(0°),M(45°) and M(90°)

4measurements with additional 1/4 wave-plate M(0°, 45°), M(0, 135°), M(90°, 45°) and M(90°, 135°)

The polarization parameters and the Stokes are deduced for each pixel of the image:

⎥⎥⎥⎥

⎦

⎤

⎢⎢⎢⎢

⎣

⎡

=

⎥⎥⎥⎥

⎦

⎤

⎢⎢⎢⎢

⎣

⎡

=

εραεραερ

2sin.2sin.2cos.2cos.2cos.

1

.I

VUQI

S



Imaging polarization of a LCD backlight with BEF film




Imaging polarization of a LCD without top polarizer versus grey level

Full polarization Polarization degree

Polarization orientationPolarization ellipticity


Display

Diaphragm

Band pass Filters

CCD sensor

UMasterMS imaging spectrophotometerRadiance measurements High resolution & high sensitivityLow stray lightEntrance iris comparable to human

pupilPolarization state measurements

Multispectral imaging : UMasterMS


0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

350 400 450 500 550 600 650 700 750

Tra

ns

mit

tan

ce

(%)

Wavelength (nm)

Filter wheel and transmittance of the 31 interference filters



GretaMacbeth color checker24 natural object, chromatic,

primary and gray scale colors

1 2 3 4 5 6

7 8 9 10 11 12

13 14 15 16 17 18

19 20 21 22 23 24

Measured reflection coefficients versus wavelengthGretaMacbeth characteristics are also reported





1 2 3 4 5 6

7 8 9 10 11 12

13 14 15 16 17 18

19 20 21 22 23 24




LEDWall tile measurement of blue LEDs



Emission peak adjustment using Pearson VII model

X0 = wavelength mean positionω = wavelength band pass



Mean wavelength of blue LEDs Band pass of blue LEDs




Correlation between mean wavelength and band pass for blue LEDs


Magnification Spatial resolution

Field of view Working distance

X1 9x9µm 13.5x9mm 30mm

X2 18x18µm 27x18mm 60mm

X4 36x36µm 54x36mm 120mm

Display

Diaphragm

Filters

CCD sensor

Additional optics

3 additional optics available for UMaster

High spatial resolution imaging : UMaster + add. optics


Individual pixels can be measured precisely



OLED display (250 ppi pixel density)White, Red, Green & Blue



Single pixel characteristics can be extracted

Gamut distribution in the chromatic plane

Gamut distribution on the display surface



Ultra high spatial resolution imaging : MURA MVP

MURA MVP is the new generation of ELDIM Micro Video Photometer. The system uses the UMaster technology coupled to highh quality microscope objectives.

3 magnifications available:

Objective Field of view Max spatial Resolutionx20 650x440µm 0.5µmx10 1300x880µm 1µmx5 2600x1760µm 2µm

Microscopeobjective

Optional RGB LED illumination


OFF state

ON state

Measurements on Ipod display

Color Luminance

40µm

Ultra high spatial resolution imaging : MURA MVP


Normal incidence measurements : double telecentric

ELDIM proposes now a series of double telecentric objectives with various sizes that allow near normal incidence analysis of small & medium display with unprecedented accuracy. Luminance, color, polarization and radiance can be measured with the new generation of UMaster instruments and this new family of optics.

Available sizes:- 9 inches- 12 inches

Object

Diaphragm

color filters

CCD sensor

Normal incidence measurements become possible

Slide #28

ELECTRONICS FOR DISPLAYS AND IMAGING DEVICES

1185, rue d’EPRON 14200 Hérouville Saint-Clair – FrancePhone : +33 2 31 94 76 00 – Fax : +33 2 31 940 950 – E-mail : [email protected]

Thanks for your attention

Come to see us at booth 560

EXHIBITOR FORUM, SID 2012June 6, 2012

new generation of imaging colorimeters and spectrophotometers

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