Low Temperature Polycrystalline Silicon 6.9 cm (2.7-type) 1/8 VGA
Color Reflective LCD Module with Built-in Low-power 3-bit D/A Converter
ACX705AKM
The switch to color displays in portable information terminals
(PDAs) and multifunction portable communication terminals is
proceeding rapidly.
Sony has now developed the ACX705AKM 2.7-type 1/8 VGA color
LCD module for these markets, which desire high-picture quality
and low power. This device achieves the industry鈥檚 highest level
of display performance by using Sony鈥檚 low temperature poly-
crystalline silicon reflective LCD technology.
This device achieves high-picture quality, low power (47 mW),
and ease of use (20-pin interface) in a full module form that in-
cludes an LCD panel with a built-in low-power consumption 3-bit
D/A converter, system ICs (controller IC and driver IC), a drive
board that includes a DC-DC converter, and a highly efficient LED
front light.
As the trend towards the use of color in
portable terminal display gains momen-
tum, the aspects that are most desired
in LCD modules are high-picture
quality, low-power consumption, and
miniaturization (including thinner and
lighter weight). To respond to these
desires, Sony has always approached
color reflective LCD development by
stressing basic performance. Following
the development of a 3.8-Type prod-
uct*
1
, Sony has now developed a 2.7-
Type model to add to the product line.
With this product, Sony continues to
lead the world in portable terminal color
displays.
ing the RMP (Random Multi Profile*
1
)
structure, and thus can respond to needs
for high-picture quality.
s
s
s
s
s
s
s
1/8 VGA color reflective LCD mod-
ule
240
脳
RGB
脳
160 stripe arrangement
TFT panel with built-in 3-bit D/A
converter
Module includes a drive board that
mounts the controller IC, driver IC,
and DC-DC converter.
Built-in high-efficiency low-power
consumption LED front light
20-pin interface
Low power: 47 mW (module total)
Full Module Form
The ACX705AKM of this release is a
full module product that unifies an LCD
panel, a drive board, and a front light in
a single unit. The drive board mounts
ICs and a DC-DC converter. Since the
ACX705AKM is a full module product,
a 20-pin interface can be used, no power
supply needs to be provided, and adjust-
ment is unnecessary. Thus this product
achieves the maximum in ease of use
and at the same time achieves low-
power operation with a total power
consumption of 47 mW. (See figure 1.)
Drive Board with System
ICs and High-efficiency
LED Front Light
The ACX705AKM drive board mounts
the newly-developed CXD3507GG
controller IC and the CXD2475TQ
driver IC, and a DC-DC converter that
supplies the power required for panel
and driver IC drive. All of the compo-
nents used on this board were designed
for thin-form mounting, and thus the
board supports end product miniaturiza-
tion. The front light system uses white
LEDs as the light source and by adopt-
ing a highly efficient light guide,
achieves both adequate brightness (6 cd/
m
2
) for work in dark environments and
low current (15 mA) drive. Sony is com-
mitted to responding to our customers鈥?/div>
needs not only with panel-only products,
but with full module type products such
as this, the ACX705AKM. (See figure
3.)
*1:
See Sony Cx-News, Volume 20.
*2:
Birefringence Dispersion Matching
V
O
I
C
E
The ACX705AKM features an ex-
tremely ease-to-use size that can
be used not only in products for
the rapidly growing PDA and mul-
tifunction communication termi-
nal markets, but also in a wide
variety of products limited only by
your imagination. I strongly urge
you to try this device. We are
hopeful that the market for color
LCDs for portable equipment will
grow rapidly due to Sony鈥檚 LCD
technology. Furthermore, this
newly-developed panel featuring
a built-in D/A converter repre-
sents the first step towards the
achievement of 鈥渟ystem-on-
glass鈥?technology, and that Sony
is committed to continued devel-
opment of this concept.
A High-picture Quality,
Low-power Consumption
Panel
The ACX705AKM LCD panel uses
Sony鈥檚 unique circuit technology and
Sony鈥檚 low temperature polycrystalline
silicon TFT technology and includes a
built-in 3-bit D/A converter to achieve
high-picture quality, ultralow-power
consumption (10 mW for the panel
itself), and a narrow frame. (See figure
2.) This panel achieves high contrast
ratio (panel: 35:1 typical) by adopting
an advanced BDM*
2
retardation film*
1
that was designed for optimal optical
properties, and achieves a high reflec-
tion ratio (panel: 34% typical) by adopt-
SONY
1
2
