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 SONY
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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 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 s 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- 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 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 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- 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 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.) *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. |
