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參數(shù)資料
| 型號(hào)： | FPD33684B |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Low Power, Low EMI, TFT-LCD Column Driver with RSDS⑩ Inputs, 64 Grayshades, and 384 Outputs for XGA/SXGA Applications |
| 中文描述： | 低功耗，低EMI，TFT - LCD的柱與⑩輸入?yún)^(qū)特別職務(wù)隊(duì)，64 Grayshades，和384的XGA輸出驅(qū)動(dòng)器/ SXGA應(yīng)用 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大小： | 233K |
| 代理商： | FPD33684B |
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Block Diagram
Functional Description
GENERAL OVERVIEW
The FPD33684 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
FPD33684 utilizes National’s
Charge Conservation Technol-
ogy
that recovers energy stored in the capacitance of the
column lines to reduce power consumption further.
The FPD33684 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 FPD33684 are received via a
low power, low EMI Reduced Swing Differential Signaling
(RSDS
) bus. The RSDS
digital video commands one of
64 gray level voltages on each output. Output voltages are
driven with individual high drive, low offset operational am-
plifiers. Data loading and line buffering is accomplished by
means of an internal, bi-directional shift register.
GAMMA CORRECTION
The FPD33684 is designed to offer compatibility with a wide
range of panel gamma characteristics. The output voltage is
controlled by the digital data on the RSDS
bus. Two iden-
tical R-DACs are used to program the output voltages. One
R-DAC provides the high-polarity output voltages (voltages
higher than V
com
) and the other provides the low-polarity
output voltages (voltages lower than V
com
).
The FPD33684 is available with two R-DAC resistance curve
options, both of which have been carefully designed to ac-
curately match the natural, inverse gamma of a twisted
nematic (TN) display with a 2.2 gamma transfer character-
istic.Atypical TN display, when operated with the FPD33684
drivers will produce a luminance with grayscale characteris-
tics typical of CRT monitors. The R-DAC resistance values
for the FPD33684A are shown in
Figure 3
and
Figure 4
. The
DS200113-6
F
www.national.com
7
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