Hitachi, Ltd. (TSE: 6501) today announced the HD66352 256-grayscale TFT LCD
driver for XGA*1 and SXGA*2-size large-screen, high-definition TFT LCD panels.
The HD66352 incorporates a Full-R DAC*3, generating output grayscale voltage
levels by resistances (R) only, in DAC circuit for the LCD drive voltage generation.
Sample shipments will begin in February 2000 in Japan.
Notebook PCs and space-saving desktop PCs and monitors equipped with a TFT LCD
panel are coming into increasingly wide use, bringing a growing demand for XGA-
and SXGA-size larger screens and higher definition. In line with this trend, we can
expect to see an increasing demand for LCD drivers to drive the data lines of high-
definition TFT LCD panels. There is also a growing demand for 256-grayscale, up
from 64-grayscale, together with higher speed and lower power consumption.
Following on from the earlier release of the HD66350 256-grayscale TFT LCD driver
for XGA- and SXGA-size color TFT LCD panels, featuring 65 MHz operation and a
15 V LCD drive voltage, Hitachi is now enhancing its 256-grayscale TFT LCD driver
lineup with the release of the HD66352, providing high-speed data capture at 70 MHz
operation and a 10 V LCD drive voltage.
The HD66352 incorporates a Full-R DAC, comprising resistances only, in its DAC
circuit for LCD drive voltage generation. Hitachi DAC circuits have previously
included capacitors, necessitating discharge control for the accumulated charges. A
Full-R DAC, however, has no capacitors and so requires no control time, enabling the
rise time of DAC output waveform to be cut to approximately 60% that of the
previous Hitachi model. As a result, the rise time of LCD drive output signal is also
faster, making it possible to achieve uniform display on large-screen, high-definition
panels.
The HD66352 generates output voltages for 256-grayscales, using 8 bits of digital
data per pixel, and achieves a finer gamma-characteristic*4 than with 64-grayscales,
providing better color reproduction and enabling a maximum 16.77-million-color
display to be attained. In addition, the use of Hitachi's proprietary offset cancellation
method holds drive voltage dispersion down to +/-2 mV, providing a uniform, high-
quality panel display.
The operating voltage of the internal circuits has been reduced to 2.3 V, and a CMOS
interface capable of operating at 2.3 V is used for external circuits such as the LCD
drive timing controller, enabling low-voltage, low-power-consumption operation to be
achieved for the entire system.
The HD66352 has 384 display drive outputs, enabling the data line drive of LCD
panel to be handled by eight chips for an XGA display, and ten for SXGA. A TCP*5
package is used, employing 50 um pitch technology for the inner leads.
Hitachi will continue to enhance its product lineup to keep pace with future trends in
TFT LCD panels.
Notes: 1. XGA (Extended Graphics Array): A display definition standard. XGA
is a trademark of IBM Corporation. The display size is 1,024 x 768 dots.
2. SXGA (Super Extended Graphics Array): A display definition standard.
The display size is 1,280 x 1,024 dots.
3. Full-R DAC: A DAC (digital-to-analog converter) which generates output
grayscale voltage levels by resistances (R) only.
4. Gamma-characteristic: A non-linear characteristic representing the output
voltage corresponding to input code data of the DAC circuit that generates
LCD drive voltages. This generally denotes a characteristic of
photosensitive material or an imaging device relating to camera, television,
or similar images.
5. TCP (Tape Carrier Package): A package mounted on a thin-film tape,
allowing ultra-thin type mounting (1 mm or less).
< Typical Applications >
TFT LCD panels (notebook PCs, space-saving desktop PCs, monitors)
< Prices in Japan > (For Reference Only)
Product Code Sample Price (Yen)
HD66352 1,300
< Specifications >
Item Specification
Function 256-grayscale TFT data line driver
Power supply voltage 2.3 to 3.6 V (logic)
7.0 to 10.0 V (analog)
Operating temperature -30 to +75 degrees Celsius
Package 457-pin TCP
Data input 48-bit digital input (8 bits x 6 pixels)
Display drive outputs 384 outputs
Output voltage accuracy +/-2 mV
Clock frequency 70 MHz (Vcc = 3.0 to 3.6 V)
45 MHz (Vcc = 2.3 to 3.0 V)
Other functions Offset cancellation
Dot inversion drive
N-line inversion drive
Data inversion function
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