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參數(shù)資料
| 型號(hào)： | UC1608 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 128COM x 240SEG Matrix LCD Controller-Driver |
| 中文描述： | 128COM x 240SEG矩陣LCD控制器驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 18/42頁(yè) |
| 文件大?。?/td> | 996K |
| 代理商： | UC1608 |
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UC1608
128x240 Matrix LCD Controller-Drivers
(Revision 0.52 Preview)
15
LCD V
OLTAGE
S
ETTING
M
ULTIPLEX
R
ATES
Multiplex Rates (
MR
) is software programmable.
Two MR is supported: 96, 128.
B
IAS
R
ATIO
S
ELECTION
Bias Ratio (
BR
) is defined as the ratio between
V
LCD
and V
BIAS
, i.e.
BR = V
LCD
/V
BIAS
,
where V
BIAS
= V
B1+
– V
B1–
= V
B0+
– V
B0–
.
The theoretical optimum
Bias Ratio
can be
estimated by
+
Mux
is set to be 10~15% lower than the optimum value
calculated above in order to lower V
LCD
by 5~6%.
Such setting generally will not cause visible change
in image quality.
1
. In some applications,
BR
UC1608 supports four
BR
as listed below. BR can
be selected by software program.
BR
0
1
2
12
3
Bias Ratio 10.7
11.3
12.7
Table 2:
Bias Ratios
T
EMPERATURE
C
OMPENSATION
Four (4) different temperature compensation
coefficients can be selected via software. The four
coefficients are given below:
TC
0
1
2
3
% per
o
C
0.0
–0.05 –0.10 –0.20
Table 4:
Temperature Compensation
V
LCD
G
ENERATION
V
LCD
may be supplied either by internal charge
pump or by external power supply. The source of
V
LCD
is controlled by PC[2:1]. For good product
performance it is recommended to keep V
LCD
under
13V at room temperature.
When V
LCD
is generated internally, the voltage level
of V
LCD
is determined by four control registers:
BR
(Bias Ratio),
GN
(Gain),
PM
(Potentiometer), and
TC (Temperature Compensation), with the
following relationship:
V
%)
)
25
(
1
)
(
0
T
PM
V
LCD
C
T
PM
C
C
×
+
×
×
+
=
where
C
V0
and
C
PM
are two constants, whose value
depends on the BR-GN register setting. The
values are provided in the table on the next
page,
PM
is the numerical value of PM register,
T
is the ambient temperature in
O
C, and
C
T
is the temperature compensation coefficient
as selected by TC register.
L
OAD
D
RIVING
S
TRENGTH
The power supply circuit of UC1608 is designed to
handle LCD panels with load capacitance up to
~20nF when V
DD2
= 2.5V. For larger LCD panels
use higher V
DD
and COF packaging.
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