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Explanation Section
5. Optical System of Measuring Probe
The optical system consists of an objective lens and optical fiber.
Among the lights emitted from the LCD under measurement, only the lights that are emitted at within ±2.5 degrees
(LED Universal Measuring ø10 Probe(CA-PSU32/35) and LED Flicker Measuring ø10 Probe(CA-PS32/35) : ±5
degrees) perpendicular to the LCD are guided by the objective lens to the fiber. After being input to the fiber, the
lights are divided into three portions, and each portion is received by a sensor that has a spectral sensitivity similar
to the CIE 1931 color-matching function. (Three sensors in total).
IEC 61747-6 stipulates the following measuring requirements for LCD evaluation methods.
• Light receiving angle must be within 5 degrees.
• The measuring area must consist of 500 pixels or more.
Measuring probe satisfies the above requirements since it employs an optical system that receives only the lights
emitted within ±2.5 degrees from a relatively wide measuring area (φ27).
(LED Universal Measuring ø10 Probe(CA-PSU32/35) and LED Flicker Measuring ø10 Probe(CA-PS32/35), within
±5 degrees from a small measuring area(φ10).)
Optical fiber Sensor
Objective lens