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參數(shù)資料
| 型號(hào)： | FPD03784 |
| 元件分類(lèi)： | 顯示驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 199K |
| 代理商： | FPD03784 |
Block Diagram
Functional Description
GENERAL OVERVIEW
The FPD03784 is a low power, low EMI, 384 output column
driver with 64 gray level capability (6-bit). It provides direct
drive for TFT-LCD displays, eliminating the need for V
modulation. Direct drive significantly reduces system power
consumption and also reduces component count while pro-
viding superior image quality and cross-talk margin. The
FPD03784 utilizes National’s Charge Conservation Technol-
ogy that recovers energy stored in the capacitance of the
column lines to reduce power consumption further.
The FPD03784 is designed for use in systems using dot
inversion as the method of polarity inversion. Column inver-
sion and N-line inversion are also supported. Other modes of
polarity inversion including line inversion and frame inversion
are not supported.
Digital video data inputs to the FPD03784 are received on
six, six bit wide busses (dual bank, RGB busses) using TTL
signaling. The digital video commands one of 64 gray level
voltages on each output. Output voltages are driven with
individual high drive, low offset, programmable-slew-rate,
operational amplifiers. Data loading and line buffering is
accomplished by means of an internal, bi-directional shift
register.
GAMMA CORRECTION
The FPD03784 is designed to offer compatibility with a wide
range of panel gamma characteristics. The output voltage
levels corresponding to each of the 64 gray level commands
can be externally adjusted to match the desired gamma
characteristics of the display by means of two internal
resistor-string DACs (RDACs). One RDAC provides the
high-polarity output voltages (voltages higher than V
) and
the other provides the low-polarity output voltages (voltages
lower than V
com
).
The default RDAC resistance values have been carefully
designed to provide a smooth 2.2 gamma characteristic in a
twisted nematic (TN) display. This is especially useful for
monitor applications. Consequently, most application de-
signs will only need to provide references for each of the two
ends of the two RDACs (four gamma references).Additional,
intermediate taps to the RDAC are also provided for optional
customization of the display gamma for contrast control as
an example.
CHARGE CONSERVATION TECHNOLOGY
National Semiconductor’s proprietary charge conservation
technology
significantly
reduces
Charge conservation works by briefly switching all of the
columns at the start of each line to a common node. This has
power
consumption.
DS200152-6
F
www.national.com
6
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