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’s highest level

of display performance by using Sony’s 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.

s

1/8 VGA color reflective LCD mod-

ule

s

240

× RGB × 160 stripe arrangement

s

TFT panel with built-in 3-bit D/A

converter

s

Module includes a drive board that

mounts the controller IC, driver IC,

and DC-DC converter.

s

Built-in high-efficiency low-power

consumption LED front light

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20-pin interface

s

Low power: 47 mW (module total)

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-

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

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.)

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

that was designed for optimal optical

properties, and achieves a high reflec-

tion ratio (panel: 34% typical) by adopt-

structure, and thus can respond to needs

for high-picture quality.

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/

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.)

*1: See Sony Cx-News, Volume 20.

*2: Birefringence Dispersion Matching

VOICE

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.