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LCD BACKLIGHTING TESTING
One of the fastest grow areas of
application of high brightness LEDs is the back illumination of
liquid crystal displays (LCDs). Replacing traditional CCFLs, LEDs
can be arranged in an assortment of array configurations to
uniformly backlight the LCD.
The photometric performance of the LED array is characterized by
total spectral flux
of the array. The array is an extended light source, making the
measurement application similar to the testing performed on
traditional light sources. The most important photometric parameter
is typically total luminous flux.
The most common method for measuring the total luminous flux of
light sources is using an integrating sphere photometer with a Vl
corrected photometer or spectrometer. Rather than a bulb being
placed in the integrating sphere, the entire panel is mounted to the
mounting platform and powered to measure the panel's total spectral
or total luminous flux.
The reading from the detection system is compared to a similar
reading obtained from a calibrated standard lamp of known output,
commonly referred to as the “comparison method”. The result of this
comparison determines the flux of the tested LED backlight assembly.
Typical quantities of interest are
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