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Display Applications

Mobile Phone Keypad

The widespread use of flat panel displays (FPDs) in televisions, computer monitors, automotive displays and in portable products has created the need for accurate, fast and cost-effective methods for measuring colour and luminance, uniformity, contrast ratio, view angle and for detecting display defects.

Luminance & Colour Measurements

The Konica Minolta LS-100 and LS-110 are simple, affordable, hand-held photometers that provide for spot luminance (brightness) measurements. The Konica Minolta CS-100A is the colorimeter version of the LS-100. The Konica Minolta CA-210 is a benchtop, tristimulus spot colorimeter that is used principally for the measurement of white balance, white uniformity, luminance, chromaticity, flicker and gamma of various flat panel display devices including LCD. The accuracy of filter photometers is always reduced when measuring narrow spectrum light sources such as LCDs and LEDs. The Konica Minolta CS-200 is a hybrid "spectral colorimeter" that combines the ease-of-use and relative affordability of the CS-100A with a colorimetric accuracy approaching that of the research-grade Konica Minolta CS-2000 spectroradiometer.

As the name suggests, "spot” photometers measure the brightness and colour of an LED or display one spot at a time. At most, you can select from up to five measurement spot sizes, either by fitting close-up lenses or by selecting alternate measurement apertures in the photometer. If a more flexible and productive (albeit more costly) solution is more your thing, you should consider an an imaging photometer.

Imaging photometers are powerful, CCD-based spatial light and colour measurement instruments that provide for increased productivity compared with traditional spot photometers and colorimeters. Whereas a spot photometer can only measure the brightness and colour of one point on a display or light source at a time, a CCD-based imaging photometer can measure literally millions of points simultaneously. The measurement spot size can be selected in software after the measurement has been made, and moreover, any number of analysis points can be defined - and recalled - as required. In addition, because the camera views the whole display at once, localised luminance and colour differences (defects) can be easily detected automatically – artefacts that spot meters might miss.

View Angle Measurements

The Westboro Photonics CONOMETER® 80 is the ideal instrument for measuring luminance, contrast, and gamma of emissive displays as a function of viewing angle. Compared with alternative Fourier (conoscopic) lens systems, the Conometer is much more affordable and provides a field of view of 80°.

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