New generation of imaging colorimeters and spectrophotometers
Transcript of 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
Slide #3EXHIBITOR FORUM, SID 2012June 6, 2009
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
Slide #4EXHIBITOR FORUM, SID 2012June 6, 2009
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 ∞
Slide #5EXHIBITOR FORUM, SID 2012June 6, 2009
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
Slide #6EXHIBITOR FORUM, SID 2012June 6, 2009
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 !
Slide #7EXHIBITOR FORUM, SID 2012June 6, 2009
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
Slide #8EXHIBITOR FORUM, SID 2012June 6, 2009
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 polarimetry : UMasterPZ
Slide #9EXHIBITOR FORUM, SID 2012June 6, 2009
Imaging polarization of a LCD backlight with BEF film
Imaging polarimetry : UMasterPZ
Slide #10EXHIBITOR FORUM, SID 2012June 6, 2009
Imaging polarimetry : UMasterPZ
Imaging polarization of a LCD without top polarizer versus grey level
Full polarization Polarization degree
Polarization orientationPolarization ellipticity
Slide #11EXHIBITOR FORUM, SID 2012June 6, 2009
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
Slide #12EXHIBITOR FORUM, SID 2012June 6, 2009
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
Multispectral imaging : UMasterMS
Slide #13EXHIBITOR FORUM, SID 2012June 6, 2009
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
Multispectral imaging : UMasterMS
Slide #14EXHIBITOR FORUM, SID 2012June 6, 2009
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
Multispectral imaging : UMasterMS
Slide #15EXHIBITOR FORUM, SID 2012June 6, 2009
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
Multispectral imaging : UMasterMS
Slide #16EXHIBITOR FORUM, SID 2012June 6, 2009
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
Multispectral imaging : UMasterMS
Slide #17EXHIBITOR FORUM, SID 2012June 6, 2009
LEDWall tile measurement of blue LEDs
Multispectral imaging : UMasterMS
Slide #18EXHIBITOR FORUM, SID 2012June 6, 2009
Emission peak adjustment using Pearson VII model
X0 = wavelength mean positionω = wavelength band pass
Multispectral imaging : UMasterMS
Slide #19EXHIBITOR FORUM, SID 2012June 6, 2009
Mean wavelength of blue LEDs Band pass of blue LEDs
Multispectral imaging : UMasterMS
Slide #20EXHIBITOR FORUM, SID 2012June 6, 2009
Multispectral imaging : UMasterMS
Correlation between mean wavelength and band pass for blue LEDs
Slide #21EXHIBITOR FORUM, SID 2012June 6, 2009
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
Slide #22EXHIBITOR FORUM, SID 2012June 6, 2009
Individual pixels can be measured precisely
High spatial resolution imaging : UMaster + add. optics
Slide #23EXHIBITOR FORUM, SID 2012June 6, 2009
OLED display (250 ppi pixel density)White, Red, Green & Blue
High spatial resolution imaging : UMaster + add. optics
Slide #24EXHIBITOR FORUM, SID 2012June 6, 2009
Single pixel characteristics can be extracted
Gamut distribution in the chromatic plane
Gamut distribution on the display surface
High spatial resolution imaging : UMaster + add. optics
Slide #25EXHIBITOR FORUM, SID 2012June 6, 2009
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
Slide #26EXHIBITOR FORUM, SID 2012June 6, 2009
OFF state
ON state
Measurements on Ipod display
Color Luminance
40µm
Ultra high spatial resolution imaging : MURA MVP
Slide #27EXHIBITOR FORUM, SID 2012June 6, 2009
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