
LZ-702W
12
Step Positive/Negative Appraisal Sampling Enabling Line
1st step 23 24H~35H
2nd step 43 44H~55H
3rd step 63 64H~75H
4th step 83 84H~95H
5th step 103 104H~115H
6th step 123 124H~135H
7th step 143 144H~155H
8th step 163 164H~175H
Process/Requirements for data sampling
∗When γIC serial data is changed, more wait time is required
than shown below.
NTSC/PAL switching .................Approx. 500ms
AGC ON/OFF ............................Approx. 500ms
γAMP ON/OFF .........................Less than 1ms
PICTURE ..................................Less than 1ms
COLOR .....................................Less than 1ms
TINT ..........................................Less than 1ms
PHASE ......................................Less than 1ms
CONT-VIDEO ............................Less than 1ms
CONT-RGB1,2 ..........................Less than 1ms
GAMMA1 ..................................Less than 1ms
GAMMA2 ..................................Less than 1ms
RGB_AMPLITUDE....................Approx. 100ms
BRIGHT ....................................Approx. 100ms
SUB-BRIGHT R,B .....................Less than 1ms
COM_AMPLITUDE ...................Less than 1ms
COM_DC ..................................Less than 1ms
DA_COUT .................................Less than 1ms
∗Adjusting q~iinput signal/setting up selector
Input signal: Monochrome 8 steps RGB picture by OSD_IC
Setting up the selector:
V MUTE H
FULL OSD H
V SEL L
Adjustment q
RGB AMPLITUDE (RGB Amplitude control)
Sampling the LCD_G voltage value at the 2nd step, and ad-
just to the adaptation value. (V_MUTE: H)
Positive/negative appraisal at the 2nd step is run at 43H,
and sampling is run between 44H and 53H.
qStarting with the OSD_VSYNC pulse leading edge,
count the OSD_HSYNC pulse until a positive/nega-
tive appraisal at 43H of the 2nd step.
wCheck to see if VCOM_IN pulse at 43H is above or
below 1.6V.
e-1 If VCOM_IN at 43H is below 1.6V, sampling VG volt-
age value b from 44, 46, 48, 50, 52 at 5H five times,
and sampling VG voltage value a from 45, 47, 49, 51,
53 at 5H five times.
e-2 If VCOM_IN at 43H is below 1.6V, sampling VG volt-
age value a from 44, 46, 48, 50, 52 at 5H five times,
and sampling VG voltage value b from 45, 47, 49, 51,
53 at 5H five times.
(The timing of sampling is at 38.0µsec±15 from the
leading edge of H)
rEliminate the maximum and minimum value from the
sampled voltage value a/voltage value b data (five
times), and calculate the average.
tCalculate theVG amplitude by subtract averaged volt-
age value a from averaged voltage value b.
yChange the RGB_AMPLITUDE setting on the value
from tand adjust to the adaptation value.
∗Keep the above average voltage a for adjustment
wert.
Adjustment wert
BRIGHT, GAMMA1, CONT-RGB2, GAMMA2
Example: Sampling the voltage value at the 3rd step, and
adjust to the adaptation value.
Positive/negative appraisal at the 3rd step is run at 63H, and
sampling is run between 64H and 73H.
qStarting with the OSD_VSYNC pulse leading edge,
count the OSD_HSYNC pulse until a positive/nega-
tive appraisal at 63H of the 3rd step.
wCheck to see if VCOM_IN pulse at 63H is above or
below 1.6V.
e-1 If VCOM_IN at 63H is below 1.6V, sampling VG volt-
age value c from 65, 67, 69, 71, 73 at 5H five times.
e-2 If VCOM_IN at 63H is above 1.6V, sampling VG volt-
age value c from 64, 66, 68, 70, 72 at 5H five times.
(The timing of sampling is at 38.0µsec±15µsec from
the leading edge of H)
rEliminate the maximum and minimum value from the
a
b
1.6V
GND
38.0µsec ±15 38.0µsec ±15
1.6V
VG
V COM
OSD HSYNC
b
ADJUSTMENT