ACX306AK
6. Response Time
Input signal voltage (Waveform applied to measured pixels)
Response times ton and toff are measured
by System II by applying the input signal
voltages in the figure to the right to each
input pin. These times are defined by the
following formulas.
4.0V
6.0V
0.5V
ton = t1 – tON
0V
toff = t2 – tOFF
t1: time which gives 10% transmittance
of the panel.
Optical transmittance output
waveform
100%
t2: time which gives 90% transmittance
of the panel.
90%
10%
0%
The relationships between t1, t2, tON and
tOFF are shown in the figure to the right.
tON t1
ton
tOFF t2
toff
7. Flicker
Flicker (F) is given by the following formula. DC and AC components (NTSC: 30Hz, rms; PAL: 25Hz, rms)
of the panel output signal for gray raster mode are measured by a DC voltmeter and a spectrum analyzer
in System II.
F [dB] = 20 log {AC component/DC component}
R, G, B input signal voltage for gray raster mode is given by Vsig = 6.0 ± V50 [V]
where: V50 is the signal amplitude which gives 50% of transmittance in V-T curve.
8. Image Retention Time
Image retention time is given by the following procedures.
Apply the monoscope pattern to the LCD panel for 1 minute and then change to a gray scale signal
(Vsig = 6.0 ± VAC [V]; VAC = 3 to 4V). Judging by sight at the VAC that holds the maximum image retention,
measure the time for the residual image to disappear.
Monoscope pattern input conditions
Black level
Vsig = 6.0 ± 4.0 or 6.0 ± 2.0 [V]
(shown in the figure to the right)
Vcom = 5.5V
4.0V
White level
2.0V
6.0V
0V
2.0V
4.0V
Vsig waveform
– 16 –
SONY [ SONY CORPORATION ]
