LC420W02
Liquid Crystal Display
Product Specification
3-6. Power Sequence
3-6-1. LCD Driving circuit
90%
90%
10%
Power Supply For LCD
VLCD
10%
0V
T1 T2
T5 T6
T7
Valid Data
Interface Signal (Tx)
T3
T4
T9
T8
Option Signal
(DISM, DCR_Enable)
Lamp ON
Power for Lamp
Table 11. POWER SEQUENCE
Value
Parameter
Unit
Min
1.0
5.0
200
200
0.5
-
Typ
Max
T1
T2
T3
T4
T5
T6
T7
T8
T9
-
20
50
-
ms
ms
ms
ms
ms
ms
s
-
-
-
-
-
50
300
-
-
1.0
-
0 < T8 < T2
0 < T9 < T5
ms
ms
Note : 1. Please avoid floating state of interface signal at invalid period.
2. When the interface signal is invalid, be sure to pull down the power supply VLCD to 0V.
3. The case when the T2/T5 exceed maximum specification, it operates protection
pattern(Black pattern) till valid signal inputted. There is no reliability problem.
4. The T3/T4 is recommended value, the case when failed to meet a minimum specification,
abnormal display would be shown. There is no reliability problem.
15 / 28
Ver. 1.0
Dec. 19, 2005
LG [ LG SEMICON CO.,LTD. ]
