Sony ACX705AKM 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 Datasheet

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.
1/8 VGA color reflective LCD module
■
240 × RGB × 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)
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 polycrystalline 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 includes 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 momentum, 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 product*1, Sony has now developed a 2.7Type model to add to the product line.
V
O
I
C
E
The ACX705AKM features an extremely ease-to-use size that can
be used not only in products for
the rapidly growing PDA and multifunction communication terminal 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 represents the first step towards the
achievement of “system-onglass” technology, and that Sony
is committed to continued development of this concept.
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 adjustment is unnecessary. Thus this product
achieves the maximum in ease of use
and at the same time achieves lowpower 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
an advanced BDM*2 retardation film*1
that was designed for optimal optical
properties, and achieves a high reflection ratio (panel: 34% typical) by adopt-
ing the RMP (Random Multi Profile*1)
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 components used on this board were designed
for thin-form mounting, and thus the
board supports end product miniaturization. The front light system uses white
LEDs as the light source and by adopting 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 committed 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
Symbol
1
VCC1
2
VCC1
3
GND
4
GND
5
R0
6
R1
7
R2
8
G0
9
G1
10
G2
11
B0
12
B1
13
B2
14
Hsync
15
Vsync
16
S/D
17
MCK
DC/DC
converter
VCC1 (+3.8 V)
+9.0 V
+5.0 V
–6.5 V
VCC2 (+3.0 V)
+3.0 V
Data in
(RGB × 3 bits)
Hsync
Vsync
MCK
S/D
Front light (LED)
Control pulse
9
36
LCD controller
CXD3507GG
22
Control pulse
+5.0 V
H driver
Data
RGB × 3 bits × 4
Control pulse
V driver
Pin No.
Poly-Si TFT LCD
(240 × RGB × 160)
8
15 mA
(25 °C)
Reference
voltage driver
CXD2475TQ
Vref
H driver
VCOM
+9.0 V, –6.5 V
18
VCC2
19
LED VDD
20
LED GND
Drive board
■ Figure 1 Module Block Diagram
OE level shifter
HST level shifter
HST
HCK
L/S
HSR with L/S (120 stages)
data1/xdata1 (RGB × 3 bits)
OE1
Sampling latch (120 × RGB × 3 bits)
2nd latch (120 × RGB × 3 bits)
L/S
OE2
VST level shifter
VST
3-bit DAC (120 × RGB)
VCK
ENB level
shifter
Reference voltage × 8
Display area
240 × RGB × 160
HCK
HST
PAD
(78 pins)
Contrast
Reflection ratio
3-bit DAC (120 × RGB)
OE2
2nd latch (120 × RGB × 3 bits)
L/S
data2/xdata2 (RGB × 3 bits)
Preliminary specification
LCD + F/L + drive board
(2 ICs and a DC/DC converter)
57.6 mm (W) × 38.4 mm (H):
Diagonal 6.92 cm (2.7-type)
3:2
1/8 VGA (240 (H) × RGB × 160 (V))
Number of effective dots
115.2 K dots
OE level
shifter
OE1
Module
configuration
Angle of view
VSR (160 stages)
L/S
OE1
OE2
Parameter
Screen size
L/S
ENB
■ Table 1 ACX705AKM Basic Specifications
Sampling latch (120 × RGB × 3 bits)
L/S
HST level shifter
■ Figure 2 Panel Block Diagram
HSR with L/S (120 stages)
No F/L models: 30:1 (typ.)
F/L models: 15:1 (typ. F/L off)
30% (typ.)
Number of colors
For each of RGB: 3 bits (512 colors)
Frame frequency
75 Hz
Supply voltage
DC/DC converter: 3.8 V (typ.)
Controller: 3.0 V (typ.)
Power
consumption/
brightness
47 mW (typ. F/L excluded)
F/L: 100 mW @ 6 cd/m2 (typ.)
Panel dimensions
Module
dimensions
66.30 mm (H) × 45.44 mm (V)
71.4 mm (W) × 52.0 mm (H)
× 4.9 mm (t) (Max. 6.5 mm (t))
Operating temperature
–10 to +60 °C
Storage temperature
–30 to +70 °C
F/L: front light
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