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