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參數(shù)資料
| 型號： | UC1682 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HIGH-VOLTAGE MIXED-SIGNAL IC |
| 中文描述： | 高電壓混合信號集成電路 |
| 文件頁數(shù)： | 31/70頁 |
| 文件大?。?/td> | 1161K |
| 代理商： | UC1682 |
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UC1682
80x104RGB CSTN Controller-Driver
Revision 0.6
29
LCD V
OLTAGE
S
ETTING
M
ULTIPLEX
R
ATES
Multiplex Rate is completely software
programmable in UC1682 via registers CEN,
DST, DEN, and partial display control LC[9:8].
Combined with low power partial display mode
and a low bias ratio of 5, UC1682 can support
wide variety of display control options. For
example, when a system goes into stand-by
mode, a large portion of LCD screen can be
turned off to conserve power.
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
lower/higher than the optimum value calculated
above will not cause significant visible change in
image quality.
1
.
BR
of value 15~20%
Due to the nature of STN operation, an LCD
designed for good gray-shade performance at
high Mux Rate (e.g. MR=80), can generally
perform very well as a black and white display, at
lower Mux Rate. However, it is also true that such
technique generally can not maintain LCD’s
quality of gray shade performance, since the
contrast of the LCD will increase as Mux Rate
decreases, and the shades near the two ends of
the spectrum will start to lose visibility.
UC1682 supports four
BR
as listed below. BR
can be selected by software program.
BR
0
5
1
7
2
8
3
9
Bias Ratio
Table 1:
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
-0.05
-0.10
-0.15
-0.20
Table 2:
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[3:2]. For good product
reliability, it is recommended to keep V
LCD
under
12V over the entire operating range.
When V
LCD
is generated internally, the voltage
level of V
LCD
is determined by three control
registers:
BR
(Bias Ratio),
PM
(Potentiometer),
and TC (Temperature Compensation), with the
following relationship:
(
0
PM
V
LCD
PM
C
C
V
×
+
=
%)
)
25
(
1
)
T
C
T
×
+
×
where
C
V0
and
C
PM
are two constants, whose value
depends on the setting of BR register, as
illustrated 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.
V
LCD
F
INE
T
UNING
Gray shade and color STN LCD is sensitive to
even a 1% mismatch between IC driving voltage
and the V
OP
of LCD. However, it is difficult for
LCD makers to guarantee such high precision
matching of parts from different venders. It is
therefore necessary to adjust V
LCD
to match the
actual V
OP
of the LCD.
For the best results, software or
OTP based V
LCD
adjustment
is the recommended method for V
LCD
fine tuning.
For applications where mechanical manual fine
tuning of V
LCD
becomes necessary, then
V
BIAS
pin
may be used with an external trim pot to fine tune
the V
LCD
.
L
OAD
D
RIVING
S
TRENGTH
The power supply circuit of UC1682 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.
20nF is also the recommended limit for LCD
panel size for COG applications.
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