– 13 –

LCX005BKB

6. Response Time

Response time ton and toff are defined by

the formulas (5) and (6) respectively.

ton = t1 – tON ...(5)

toff = t2 – tOFF ...(6)

t1: time which gives 10% transmittance of

the panel.

t2: time which gives 90% transmittance of

the panel.

The relationships between t1, t2, tON and

tOFF are shown in the right figure.

7. Flicker

Flicker (F) is given by the formula (7). DC and AC (NTSC: 30Hz, rms, PAL: 25Hz, rms) components of the

panel output signal for gray raster∗ mode are measured by a DC voltmeter and a spectrum analyzer in

System II.

F (dB) = 20log

{

8. Image Retention Time

Apply the monoscope signal to the LCD panel for 60 minutes and then change this signal to the gray scale

time till the residual image becomes indistinct.

∗ Monoscope signal conditions:

Vsig = 6±4.5 or 6± 2.0 (V)

(shown in the right figure)

Input signal voltage (waveform applied to the measured pixels)

4.5V

0.5V

6V

0V

Optical transmittance output waveform

100%

90%

10%

0%

tON

t1

ton

tOFF

t2

toff

∗ R, G, B input signal condition for gray raster mode

of transmittance in V-T characteristics.

Black level

White level

Vsig waveform

6V

0V

4.5V

2.0V

4.5V

2.0V

AC component

DC component