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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 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. 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 module 240 x RGB x 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 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.)
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
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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.
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-
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Symbol VCC1 VCC1 GND GND R0 R1 R2 G0 G1 G2 B0 B1 B2 Hsync Vsync S/D MCK VCC2 LED VDD LED GND Drive board
15 mA (25 C) +5.0 V Control pulse 8
VCC1 (+3.8 V) VCC2 (+3.0 V)
+3.0 V
DC/DC converter
Control pulse
+9.0 V +5.0 V -6.5 V Front light (LED)
36
Data in (RGB x 3 bits) Hsync Vsync MCK S/D
9
H driver
LCD controller CXD3507GG
Data RGB x 3 bits x 4 22 Control pulse
V driver
Poly-Si TFT LCD (240 x RGB x 160)
Reference voltage driver CXD2475TQ
Vref
H driver
VCOM
+9.0 V, -6.5 V
s Figure 1 Module Block Diagram
HST level shifter HST HCK
OE level shifter
L/S
HSR with L/S (120 stages) Sampling latch (120 x RGB x 3 bits) 2nd latch (120 x RGB x 3 bits) 3-bit DAC (120 x RGB)
data1/xdata1 (RGB x 3 bits) OE1 OE2 VST level shifter VST ENB VCK OE1 OE2 ENB level shifter
s Table 1 ACX705AKM Basic Specifications
Parameter Module configuration Screen size Preliminary specification LCD + F/L + drive board (2 ICs and a DC/DC converter) 57.6 mm (W) x 38.4 mm (H): Diagonal 6.92 cm (2.7-type) 3:2
L/S
L/S
VSR (160 stages)
L/S
Angle of view
1/8 VGA (240 (H) x RGB x 160 (V)) Number of effective dots 115.2 K dots
Display area 240 x RGB x 160
Contrast Reflection ratio Number of colors Frame frequency
No F/L models: 30:1 (typ.) F/L models: 15:1 (typ. F/L off) 30% (typ.) For each of RGB: 3 bits (512 colors) 75 Hz DC/DC converter: 3.8 V (typ.) Controller: 3.0 V (typ.) 47 mW (typ. F/L excluded) F/L: 100 mW @ 6 cd/m2 (typ.) 66.30 mm (H) x 45.44 mm (V) 71.4 mm (W) x 52.0 mm (H) x 4.9 mm (t) (Max. 6.5 mm (t)) -10 to +60 C -30 to +70 C F/L: front light
Reference voltage x 8 OE level shifter OE2 OE1 HCK HST
3-bit DAC (120 x RGB) 2nd latch (120 x RGB x 3 bits) Sampling latch (120 x RGB x 3 bits) HSR with L/S (120 stages)
Supply voltage Power consumption/ brightness Panel dimensions Module dimensions Operating temperature Storage temperature
L/S
data2/xdata2 (RGB x 3 bits)
L/S
PAD (78 pins)
HST level shifter
s Figure 2 Panel Block Diagram

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