Display Optical Measurement System - PanelTest

Mobile Display Measurement System

PanelTest performs rapid display optical measurements for cell phone, tablet, and laptop sized LCD or OLED displays. It comes standard with three optical instruments for display measurement, an LCD tester for display drive, and can be optionally configured to provide viewing angle and multi-point measurements.

Display Size

Test up to 17″ displays with motion control and measurement spot tracking for quick and accurate measurements

Optical Instruments

3 instruments included: Spectrometer, CCD Camera, and Response Time detector. Optional 4th instrument can be installed for viewing angle measurements

Fast Automated Tests

Under 60 seconds per display for most optical performance test sequences. Supports a variety of standard and custom optical performance tests

Test Pattern Generators

Includes a Westar T-Drive SD-100 LCD Tester for automated test pattern generations and control

Designed for production line or lab

PanelTest provides an entire dark room laboratory in a cabinet. PanelTest can be used on the LCD or OLED production line or in the lab with test times as little as 60 seconds per display. The PanelTest software performs Pass/Fail testing and calculates statistical process parameters, such as Cpk, while logging all test data to a database. Data can be exported to Excel reports

Full optical characterization

PanelTest can be set up to run many standard test suites and other display tests as well as programmable customized tests. Contact Us to learn more.

*Note: Viewing angle performance measurements require optional viewing angle imager

Center Screen Luminance

Center Screen Color

CIE Chromaticity

Correlated Color Temperature

Color Gamut and %NTSC

Shadowing (Cross Talk)

Gray Level Response Time

Luminance Uniformity

Contrast Ratio Uniformity

Color Uniformity

Contrast Ratio



Luminance vs Viewing Angle*

Contrast Ratio vs Viewing Angle*

Color vs Viewing Angle*

Image Retention

Warm Up Time

Custom Tests and more…

For an explanation on these tests and other common display measurement terms, check out the Glossary of Display Optical Measurement

Includes 3 optical instruments

PanelTest employs three sensors, each optimized for specific measurement tasks. A high sensitivity spectrometer with a cooled back-thinned CCD provides the highest measurement accuracy throughout the color gamut for luminance, contrast and color measurements. A CCD camera provides rapid uniformity measurements. Westar’s proven TRD-200 Temporal Response Detector uses a PMT to provide accurate flicker and response time measurement. In addition to the three sensors included, an optional imager can be installed for viewing angle performance measurements.

Test Pattern

Automated test pattern generation

PanelTest comes standard with our T-Drive SD100 LCD Tester. T-Drive SD-100 drives RGB, CPU, SPI, and other small display formats. Westar offers New Display Tooling (NDT) solutions that allow a custom display to be tested on the PanelTest platform.

Fast and easy to operate

In the past, qualification and QC testing of mobile displays often involved a dark room laboratory with optical instruments mounted on home-made fixtures. Testing was labor intensive and took too long to acquire significant statistical data. This resulted in very long test times for qualification testing and limited QC verification. With its fully integrated instruments, display drive, and powerful software, PanelTest makes rapid qualification testing and QC testing possible!

PanelTest Interface
Optical Measurement Report - Westar

Customizable reports

PanelTest comes standard with Microsoft Excel for data reporting.  Use one of our pre-formatted reports or design your own.


Parameter Specification
Motion Base
X Axis Range (Left – Right) ~20” (~50 cm)
Y Axis1 Range (Front –Back) ~12” (~30 cm)
X, Y Accuracy / Precision ±0.01” (0.25 mm) / ±0.006” (0.15 mm)
Display Under Test (DUT)
Maximum Width / Height 16” (40.6 cm) / 11” (27.9 cm)
Maximum Diagonal 17” (43.2 cm)
Maximum Thickness3 1” (2.54 cm)
Fixturing Standard Universal Fixture (SUF)
Test Capabilities
Center Screen Luminance, Color, Contrast Ratio, CCT, Gamma, CIE Chromaticity, Color Gamut and %NTSC
Uniformity Luminance Uniformity, Color Uniformity, Contrast Ratio Uniformity
Viewing Angle2 Luminance vs. Viewing Angle, Contrast vs. Viewing Angle, Color vs. Viewing Angle
Temporal Gray Level Response Time, Flicker
Other Shadowing (Cross-Talk), Image Retention, Warm-Up time
Custom Tests Yes, Contact Westar
Instruments: CCD
Optics Wide Field of View Lens
Resolution Resolution 1392x1040, 12-bit
Uniformity Accuracy ±5%
Uniformity Repeatability ±2%
Instrument Location Fixed, direct view display active area
Instruments: Spectrometer
Detector Type Back thinned CCD Array TE cooled
Optics Fiber optically coupled lens
Measurement Spot Size3 3.5 mm
Spectral Range 380 – 750 nm
Spectral Resolution less than 4nm FWHM
Luminance Range 0.05 ~ 1000 cd/m2
Luminance Accuracy ±3% (illuminant A)
Luminance Repeatability ±0.5% (greater than 1 cd/m2)
Color Accuracy ±0.003 u’v’ (illuminant A)
Color Repeatability ±0.001 u’v’ (greater than 1 cd/m2)
Instrument Location Single linear axis, dual axis optional
Parameter Specification
Instruments: Response Time Detector
Model Westar TRD-200
Optics Fiber optically coupled lens
Response Time / Repeatability less than 50us / ±2%
Flicker Accuracy / Amplitude ±1 Hz / ±5%
Instrument Location Single linear axis, dual axis optional
Instruments: Viewing Angle Imager (optional)
Viewing Angle Range ±80º
Luminance Accuracy ±4% (illuminant A)
Instrument Location Single linear axis, dual axis optional
Display Drive
LCD Tester Westar T-Drive SD-100
Interfaces RGB, CPU, 3-wire or 4-wire SPI, MIPI, MDDI, and other interfaces
LED Backlight Drive Common anode, Common cathode, Series
Power Supplies 3, programmable
Instruments Viewing Angle Imager
Display Drive Westar T-Drive II, Probe Fixture to accept QuickTest trays, display tooling
Motion Y-Axis motion stage
Software NI TestStand
Sequences Standard and custom test sequences
System Controller PC
Processor / Motherboard 19” Rack Mounted Industrial PC with 7X USB, 6X RS-232, 2X Ethernet Ports
Monitor and Peripherals 22” LCD Flat Panel, Keyboard, Mouse
Operating System and Software Microsoft Windows, Microsoft Office, Westar PanelTest
Outside Dimensions 140cm (W) x 100cm (D) x 200 cm (H)
Weight approx. 250 Lbs. (115 Kg)
Power 115/120 VAC, 15A, 50-60Hz

Notes: 1. Y-Axis optional 2. Viewing Angle Imager required 3. Contact us for options

Ordering Information

The standard configuration PanelTest includes the following:

  • Rackmount PC with PanelTest Software
  • LCD Monitor
  • Light-safe test enclosure
  • Integrated sensor suite
  • Spectrometer and CCD camera
  • Westar TRD-200 response time detector
  • T-Drive SD-100 Mobile Display Tester

Check out the Options and Accessories to find out more information on customizing the PanelTest for your application

We have an extensive catalog of options and accessories for PanelTest including:

  • Viewing Angle Imager
  • Y-Axis motion stage
  • Westar T-Drive II
  • Probe Fixture to accept QuickTest display trays
  • Display Tooling
  • Ni TestStand
  • Customized test sequences
  • Power supplies

Contact Westar for more information on options and accessories

A certified Westar installer will arrive at your facility to install the PanelTest Display Measurement System. After installing the system, the installer will provide up to 2 days of training on operation.

The PanelTest Display Measurement System comes with a limited 1 year warranty and 1 year of technical support. Contact Westar for extended warranty and support options.

Want to find out more?

If you are interested in more information, send us an inquiry.