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參數(shù)資料
| 型號： | UPD16647N |
| 廠商： | NEC Corp. |
| 英文描述： | 402/384-OUTPUT TFT-LCD SOURCE DRIVER 64 GRAY SCALE |
| 中文描述： | 402/384-OUTPUT TFT - LCD的源驅(qū)動64灰階 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 108K |
| 代理商： | UPD16647N |
Data Sheet S13607EJ2V0DS00
5
μ
PD16647
4. RELATION BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE
The 10 major points on the
γ
-characteristic curve of the LCD panel are arbitrarily set by external power supplies V
0
through V
9
. If the display data is 00H or 3FH, gray scale voltage V
0
or V
9
is output. If the display data is in the range
01H to 3EH, the high-order 3 bits select an external power pair V
n+1
, V
n
. The low-order 3 bits evenly divide the range
of V
n+1
to V
n
into eight segments by means of D/A conversion (however, the ranges from V
8
to V
7
and from V
1
to V
0
are divided into seven segments) to output a 64 gray scale voltage.
D
X5
(MSB)
D
X4
D
X3
D
X2
D
X1
D
X0
(LSB)
D
X5
0
0
0
0
1
1
1
1
D
X4
0
0
1
1
0
0
1
1
D
X3
0
1
0
1
0
1
0
1
V
n+1
-V
n
V
1
-V
2
V
2
-V
3
V
3
-V
4
V
4
-V
5
V
5
-V
6
V
6
-V
7
V
7
-V
8
V
8
-V
9
V
n
V
n+1
000
1
001
2
010
3
011
4
100
5
101
6
110
7
111
8
V
0
V
DD2
V
1
V
2
V
3
V
4
V
5
V
6
V
7
V
8
0
7
F
17
1F
Input data (HEX)
27
2F
37
3F
V
9
V
SS2
gray scale supply specified
by 00H
7 segments
8 segments
8 segments
8 segments
8 segments
8 segments
8 segments
7 segments
gray scale supply specified
by 3FH
High-order 3 bits
:
γ
-corrected power selected
(V
n
, V
n+1
)
Low-order 3 bits
: 3-bit D/A (range V
n
to V
n+1
is divided to 7 or 8 segments)
Figure4-1. Relationship between Input Data and
γ
-corrected Voltage
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