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WP214 Imaging Spectral Colorimeter Viewing Angle Measurement Report

Backlit LCD Display

Issued: April 23, 2014

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Table of Contents

1.0 WP214 IMAGING SPECTRAL COLORIMETER ........................................................................................................... 3

2.0 UNIQUE CAPABILITIES .................................................................................................................................................. 3

3.0 MEASUREMENT METHOD ............................................................................................................................................. 4

4.0 RESULTS .......................................................................................................................................................................... 5

4.1 DISPLAY WHITE .................................................................................................................................................................. 5 4.1.1 Screenshot .................................................................................................................................................................... 5 4.1.2 Tabular data ................................................................................................................................................................. 5 4.1.3 Distribution of axial spots to 50 degrees in CIE 1976 space ................................................................................. 6

4.2 DISPLAY RED ...................................................................................................................................................................... 7 4.2.1 Screenshot .................................................................................................................................................................... 7 4.2.2 Tabular data ................................................................................................................................................................. 7 4.2.3 Distribution of axial spots to 50 degrees in CIE 1976 space ................................................................................. 8

4.3 DISPLAY GREEN ................................................................................................................................................................. 9 4.3.1 Screenshot .................................................................................................................................................................... 9 4.3.2 Tabular Data ................................................................................................................................................................. 9 4.3.3 Distribution of axial spots to 50 degrees in CIE 1976 space ............................................................................... 10

4.4 DISPLAY BLUE .................................................................................................................................................................. 11 4.4.1 Screenshot .................................................................................................................................................................. 11 4.4.2 Tabular Data ............................................................................................................................................................... 11 4.4.3 Distribution of axial spots to 50 degrees in CIE 1976 space ............................................................................... 12

4.5 SPECTRAL DATA FOR RED, GREEN, BLUE, WHITE AND BLACK DISPLAY ........................................................................ 13 4.6 CIE 1976 WITH ALL MEASUREMENTS TO 50 DEGREES .................................................................................................... 16 4.7 CONTRAST ........................................................................................................................................................................ 17

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1.0 WP214 Imaging Spectral Colorimeter

The WP214 was developed to offer increased productivity to manufacturers and OEM customers who measure flat-panel displays, LED clusters, and multifunction information displays for luminance and chromaticity.

The system features a high dynamic range, cooled CCD imager with 1MP resolution and an integrated spectroradiometer which serves as the reference to correct the imager results. An automated filter wheel contains four tristimulus filters and five optional positions for scotopic or radiometric filters.

The function of the spectroradiometer is to provide high accuracy tristimulus measurements at one measurement spot, and by comparing the imaging colorimeter tristimulus data in that same location, a vector correction can be determined for the imaging colorimeter tristimulus values. This correction is applied to the imaging colorimeter data for display uniformity and viewing angle measurements.

2.0 Unique Capabilities

Choosing a measurement solution for display characterization is an important decision. Westboro Photonics is a leader in display measurement, with more than 20 years’ experience working with LED and display metrology. When evaluating technical alternatives, we invite you to consider the following important differentiators of the WP214 system:

Integrated spectroradiometer ensures superior color accuracy

Substantial time savings with simultaneous recording of an entire image vs. spot measurement systems (e.g. a complete control panel or display)

Integrated image processing functions permit new methods of analysis (e.g. automated target and background identification)

Short measurement cycles and simple setup of intuitive pass/fail criteria for use in production environments.

Compact, portable design and minimum training requirement facilitate a wide range of applications.

Built-in scripting capability to enable rapid capturing, analysis and reporting sequences.

Software development kit available for custom applications and automation

Wide assortment of Interchangeable lens options o Viewing Angle to +/- 80° when equipped with CONOMETER® lens

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3.0 Measurement Method

Sample Details:

Sample No. Description Date Analyzed

1 Mobile Display

October 21, 2013

Hardware configuration and setup:

A WP214 (S/N 2140113002, pre-production system) with CONOMETER® lens was mounted to a stage on a manual rail system.

The sample was placed on a level stage and the measurement area was aligned using the image preview feature of the Photometrica software. The precise position of the AOI’s on the surface of the sample was not tracked or tightly controlled.

All measurements were performed in a dark room.

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4.0 Results

4.1 Display White

4.1.1 Screenshot

Figure 1: Pseudo color luminance plot with display set to white (log scale)

4.1.2 Tabular data

Name Luminance cd/m²

u' v' X y CCT (K)

CENTER 234.3 0.1957 0.4667 0.3086 0.327 6750

10 E 213.9 0.1974 0.4688 0.3125 0.3299 6507

10 N 211.1 0.1975 0.4707 0.3144 0.3329 6386

10 S 192.8 0.1948 0.4671 0.3078 0.3281 6781

10 W 203.1 0.1955 0.4674 0.309 0.3282 6717

20 E 158.1 0.2001 0.4658 0.3133 0.3241 6506

20 N 155.4 0.1949 0.4748 0.3147 0.3407 6322

20 S 129.7 0.1964 0.4643 0.3074 0.323 6858

20 W 140 0.1933 0.468 0.3067 0.3301 6822

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30 E 103.7 0.1969 0.4699 0.313 0.3319 6467

30 N 94.53 0.1992 0.4739 0.3194 0.3377 6108

30 S 78.01 0.1981 0.4608 0.3066 0.317 6977

30 W 83.84 0.1968 0.4603 0.3045 0.3166 7118

40 E 55.07 0.1969 0.4678 0.3111 0.3286 6593

40 N 59.56 0.1942 0.4758 0.3147 0.3427 6312

40 S 50.61 0.1941 0.4619 0.3025 0.3199 7194

40 W 40.78 0.1978 0.4558 0.3021 0.3094 7395

50 E 29.86 0.1972 0.4732 0.3163 0.3373 6264

50 N 40.66 0.197 0.4723 0.3152 0.3358 6327

50 S 37.91 0.1906 0.4719 0.3067 0.3374 6756

50 W 24.08 0.194 0.459 0.3001 0.3155 7424

4.1.3 Distribution of axial spots to 50 degrees in CIE 1976 space

Figure 2: All AOI’s plotted in the CIE1976 color space with the display set to white

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4.2 Display Red

4.2.1 Screenshot

Figure 2: Pseudo color luminance plot with display set to red (log scale)

4.2.2 Tabular data

Name Luminance (cd/m²)

u' v' x Y Dominant Wavelength (nm)

Purity

CENTER 43.8 0.433 0.5192 0.6195 0.3302 611 0.85

10 E 41.05 0.4314 0.5193 0.6183 0.3308 611 0.85

10 N 40.08 0.4374 0.5198 0.624 0.3296 612 0.86

10 S 35.85 0.4358 0.5186 0.6208 0.3283 612 0.85

10 W 37.89 0.4354 0.5203 0.6233 0.331 611 0.86

20 E 31.73 0.4252 0.5198 0.6139 0.3336 610 0.84

20 N 29.72 0.4275 0.5216 0.6187 0.3355 609 0.86

20 S 25.49 0.4303 0.5189 0.6168 0.3306 611 0.84

20 W 25.36 0.4346 0.5213 0.6242 0.3328 610 0.87

30 E 20.52 0.425 0.5202 0.6143 0.3341 610 0.85

30 N 18.02 0.431 0.5208 0.6203 0.3332 610 0.86

30 S 15.45 0.4322 0.5172 0.6157 0.3274 613 0.83

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30 W 15.37 0.4374 0.5211 0.6261 0.3315 611 0.87

40 E 10.74 0.4262 0.5191 0.6136 0.3321 611 0.84

40 N 11.45 0.4322 0.5202 0.6204 0.3319 611 0.86

40 S 9.782 0.4391 0.5146 0.6174 0.3216 615 0.82

40 W 7.8 0.4443 0.5205 0.631 0.3286 612 0.88

50 E 6.046 0.4335 0.5186 0.619 0.3292 612 0.85

50 N 8.249 0.4311 0.5193 0.618 0.3308 611 0.85

50 S 7.241 0.4317 0.5155 0.6126 0.3252 614 0.81

50 W 4.286 0.4473 0.5189 0.6308 0.3252 613 0.87

4.2.3 Distribution of axial spots to 50 degrees in CIE 1976 space

Figure 4: All AOI’s plotted in the CIE1976 color space with the display set to red

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4.3 Display Green

4.3.1 Screenshot

Figure 5: Pseudo color luminance plot with display set to green (log scale)

4.3.2 Tabular Data

Name Luminance (cd/m²) u' v' x Y

Dominant Wavelength (nm) Purity

CENTER 169 0.1249 0.5638 0.3015 0.6047 548 0.73

10 E 153.4 0.1259 0.5642 0.304 0.6052 549 0.74

10 N 153.7 0.1275 0.564 0.3067 0.6029 549 0.74

10 S 138.5 0.1258 0.5634 0.3027 0.6027 549 0.73

10 W 147 0.1253 0.5636 0.3021 0.6037 549 0.73

20 E 113.3 0.1281 0.5637 0.3074 0.6014 550 0.74

20 N 112.5 0.1252 0.5649 0.3035 0.6086 549 0.75

20 S 95.08 0.1249 0.5634 0.301 0.6034 548 0.73

20 W 101.7 0.1247 0.5639 0.3012 0.6056 548 0.74

30 E 74.8 0.1246 0.5646 0.3019 0.6081 549 0.75

30 N 69.53 0.1247 0.5652 0.3029 0.6104 549 0.76

30 S 56.82 0.1244 0.5634 0.3 0.6037 548 0.73

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30 W 61.66 0.126 0.564 0.3039 0.6047 549 0.74

40 E 40.08 0.1258 0.5658 0.3058 0.6112 549 0.77

40 N 44.26 0.1236 0.5659 0.3018 0.614 549 0.76

40 S 37.61 0.1215 0.5644 0.2957 0.6103 547 0.74

40 W 30.2 0.1218 0.564 0.2957 0.6086 547 0.73

50 E 21.15 0.1233 0.5663 0.3015 0.6156 549 0.77

50 N 31.13 0.1206 0.567 0.2973 0.6212 548 0.77

50 S 29.09 0.1191 0.5667 0.2939 0.6215 547 0.76

50 W 17.63 0.1217 0.565 0.2968 0.6123 548 0.74

4.3.3 Distribution of axial spots to 50 degrees in CIE 1976 space

Figure 6: All AOI’s plotted in the CIE1976 color space with the display set to green

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4.4 Display Blue

4.4.1 Screenshot

Figure 7: Pseudo color luminance plot with display set to blue (log scale)

4.4.2 Tabular Data

Name Luminance

cd/m² u' v' x Y

Dominant Wavelength (nm)

Purity

CENTER 18.84 0.1729 0.1623 0.1491 0.0622 465.4 0.9276

10 E 16.85 0.1744 0.1628 0.1504 0.06236 465.1 0.9241

10 N 16.74 0.1733 0.1646 0.1499 0.06326 465.4 0.9237

10 S 15.56 0.1735 0.1622 0.1495 0.06212 465.3 0.9267

10 W 16.43 0.1722 0.1625 0.1486 0.06232 465.6 0.9286

20 E 12.59 0.1743 0.1581 0.1492 0.06015 465 0.9309

20 N 11.81 0.1688 0.1625 0.1459 0.0624 466.3 0.9352

20 S 10.56 0.1728 0.1572 0.1478 0.05975 465.3 0.935

20 W 11.23 0.1701 0.1599 0.1464 0.06115 466 0.9361

30 E 8.303 0.1719 0.1638 0.1486 0.06292 465.7 0.9274

30 N 7.123 0.1702 0.1641 0.1473 0.06314 466.1 0.9302

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30 S 6.265 0.1745 0.1513 0.1478 0.05697 464.8 0.9399

30 W 6.792 0.1737 0.1509 0.1471 0.05681 465 0.9419

40 E 4.278 0.1773 0.1595 0.1518 0.0607 464.3 0.9237

40 N 4.477 0.174 0.1651 0.1506 0.0635 465.2 0.9216

40 S 4.046 0.1746 0.1528 0.1482 0.05764 464.8 0.9378

40 W 3.418 0.176 0.1496 0.1485 0.0561 464.4 0.9397

50 E 2.404 0.1763 0.1705 0.1536 0.06601 464.9 0.9098

50 N 2.874 0.1753 0.1495 0.148 0.05608 464.5 0.9411

50 S 2.752 0.1778 0.1521 0.1505 0.0572 464 0.9331

50 W 1.921 0.1832 0.1453 0.153 0.05395 462.4 0.9333

4.4.3 Distribution of axial spots to 50 degrees in CIE 1976 space

Figure 8: All AOI’s plotted in the CIE1976 color space with the display set to blue

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4.5 Display Black

4.5.1 Screenshot

Figure 7: Pseudo color luminance plot with display set to blue (log scale)

4.5.2 Tabular Data

Name Luminance

(cd/m²) u' v' x y

CENTER 0.1591 0.184 0.4362 0.2703 0.2849

10 E 0.1899 0.1884 0.449 0.2852 0.3021

10 N 0.1522 0.1838 0.4384 0.2717 0.2881

10 S 0.1418 0.1871 0.4359 0.2738 0.2835

10 W 0.1469 0.1843 0.4417 0.2747 0.2926

20 E 0.2119 0.192 0.4624 0.3004 0.3215

20 N 0.1323 0.1855 0.4392 0.2743 0.2887

20 S 0.1189 0.1932 0.4336 0.2795 0.2788

20 W 0.1512 0.1876 0.4604 0.2932 0.3198

30 E 0.2082 0.1919 0.4777 0.3135 0.3468

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30 N 0.1077 0.1893 0.4395 0.2791 0.2881

30 S 0.09967 0.2014 0.4332 0.2887 0.276

30 W 0.1418 0.1997 0.4671 0.314 0.3264

40 E 0.1716 0.197 0.4814 0.3235 0.3513

40 N 0.09004 0.1944 0.4401 0.2856 0.2874

40 S 0.08958 0.2042 0.4368 0.2947 0.2802

40 W 0.1083 0.2118 0.4626 0.3248 0.3153

50 E 0.1362 0.2079 0.4841 0.3401 0.352

50 N 0.07753 0.2071 0.4326 0.2948 0.2737

50 S 0.0875 0.205 0.4473 0.3038 0.2946

50 W 0.08667 0.2171 0.4573 0.3264 0.3056

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4.6 Spectral data for Red, Green, Blue, White and Black Display

Figure 9: Spectral distribution plots for all colors (log scale)

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4.7 CIE 1976 with all measurements to 50 degrees

Figure 10: CIE 1976 chromaticity plot for all colors

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4.8 Contrast

Figure 11: Contrast computation (White / Black)

Name CENTER 10 E 10 N 10 S 10 W 20 E 20 N

Contrast 1473 1127 1386 1360 1383 747.2 1175

Name 20 S 20 W 30 E 30 N 30 S 30 W 40 E

Contrast 1090 925.9 498.1 877.2 782.4 590.6 320.5

Name 40 N 40 S 40 W 50 E 50 N 50 S 50 W

Contrast 661 565.2 375.9 219.5 524.7 434.3 277.7