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As shown in the Fig. 5-1, emission intensity of CRT fluctuates in a scanning period of the single frame. CRT emits
light when electronic beam hits phosphor by scanning the screen. But the electronic beam hits the phosphor only
for a moment and phosphor emits maximum light at that time and decreases the intensity gradually. So the emis-
sion intensity repeats this variation in a frame.
The reason of the variation is different by type of the display and the intensity of the PDP also fluctuates in the
single frame period. On the other hand, the intensity of the active matrix LCD is stable in the single frame as shown
in the Fig. 5-3.
<Applicable model of the CA-310 vs. display types>
The CA-310 with LED Universal Measuring ø27 Probe(CA-PU32/35) or LED Universal Measuring ø10 Probe(CA-
PSU32/35) can measure the display devices whose intensity fluctuates such as CRT or PDP. On the other hand,
when using LED Flicker Measuring ø27 Probe(CA-P32/35) or LED Flicker Measuring ø10 Probe(CA-PS32/35)
the CA-310 is limited to be used only for measuring displays whose intensity does not vary in a frame scanning
period as shown in Fig. 5-3. So inaccurate measurement data is sometimes obtained for CRT or PDP with the
CA-P32/35 or CA-PS32/35.
The emission intensity of some types of LCD fluctuates in a scanning period of the single frame. In this case,
inaccurate measurement data is sometimes obtained for even the active matrix LCD with the CA-P32/35 or
CA-PS32/35. Please contact Konica Minolta for more information.
<"Flicker" measuring function of the CA-310>
Followings explain how the CA-310 measures "Flicker". When the "Flicker" happens to active matrix LCD that is
stable during single frame scanning period (see Fig. 5-3.), the emission status is as shown in Fig. 6. When the
intensity fluctuates by each frame, human eyes notice it as flicker. "Flicker measuring function of the CA-310
quantifies the amount of this fluctuation. Since the display perception becomes very bad with "Flicker", it is
adjusted to minimum in the LCD manufacturing process.
Fig. 6 Emission status of LCD with "Flicker"
Note : The emission of CRT or PDP fluctuates in a frame and such light is called "flickering light" among the display industry.
This "flickering light" and the "Flicker" which is measured by the CA-310 are two different things.
Time
1 Frame
Emission intensity
1 Frame 1 Frame 1 Frame