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
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1/8 VGA color reflective LCD mod-
ule
The switch to color displays in portable information terminals
(PDAs) and multifunction portable communication terminals is
proceeding rapidly.
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240 × RGB × 160 stripe arrangement
TFT panel with built-in 3-bit D/A
converter
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’s highest level
of display performance by using Sony’s low temperature poly-
crystalline silicon reflective LCD technology.
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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
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.
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20-pin interface
Low power: 47 mW (module total)
ing the RMP (Random Multi Profile*1)
structure, and thus can respond to needs
for high-picture quality.
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.
Full Module Form
Drive Board with System
ICs and High-efficiency
LED Front Light
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.)
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/
m2) for work in dark environments and
low current (15 mA) drive. Sony is com-
mitted to responding to our customers’
needs not only with panel-only products,
but with full module type products such
as this, the ACX705AKM. (See figure
3.)
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’s LCD
technology. Furthermore, this
newly-developed panel featuring
a built-in D/A converter repre-
sents the first step towards the
achievement of “system-on-
glass” 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’s unique circuit technology and
Sony’s 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-
*1: See Sony Cx-News, Volume 20.
*2: Birefringence Dispersion Matching
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