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Sanyo Epson Transflective LTPS LCD display
Nic Rossmüller : October 31th 2006 - 22:00 CET
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SanyoSanyo Epson Transflective LTPS LCD display : Sanyo Epson Imaging Devices Corporation ("Sanyo Epson") announced the development of a 2.8-inch transflective low-temperature polysilicon liquid-crystal display (LCD) with pixel-integrated RAM that offers low power consumption. The fusion of telecommunications and broadcasting through digitization and the seamless integration of cable and mobile communication in the network society have raised expectations for the next generation of mobile devices and for the improved convenience that these devices will bring. Moreover, consumers are increasingly demanding that small and medium-sized LCDs for mobile devices should have high resolution and be slim and energy efficient.
Sanyo Epson Transflective LTPS LCD displaySanyo Epson 2.8 inch LCD display
To meet these demands, Sanyo Epson has developed products and technologies based on the concept of supplying clear, user-friendly displays that can be used anytime, anywhere. Focusing on the demand for low-power-consumption displays especially in mobile telephones and other portable devices, Sanyo Epson has developed a 2.8-inch transflective LTPS LCD with pixel-integrated RAM as part of its HCL-S strategy. The LCD consumes very little power even when displaying the time or a still image in color.

Sanyo Epson Transflective LCD display - Backlight
Used in many mobile devices, transflective LCDs combine a transmissive mode in which a built-in backlight illuminates the display with a reflective mode in which the display is lit by external light. While they are known for their low power consumption, in most cases the screen either completely blacks out or displays information only partially when in energy-saving sleep mode.

Sanyo Epson 2.8 inch Transflective LTPS LCD display - Built-in RAM
In developing the 2.8-inch transflective LCD with built-in RAM, Sanyo Epson has cleared the challenge of integrating SRAM (static random access memory), which stores the final data displayed on the screen, into the pixels and has equipped the LCD with the ability to switch between 256k-color and eight-color modes. When in active mode, such as during input, the screen displays in 256k-color mode. When in sleep mode, meanwhile, the LCD is able to continue displaying the final screen recorded by the SRAM in eight colors. In this mode, the display uses the reflective method and does not require a backlight. A color image can continue to be displayed using little power in this state, because there is no need for drive voltage to power the writing of data or a backlight. The specifications of the display are listed below.

Transflective LTPS LCD display - FPD International 2006
In addition, the LCD is fully compliant with the European Union's RoHS (restriction of the use of certain hazardous substances in electrical and electronic equipment) Directive. Sanyo Epson intends to commercialize the LCD both in Japan and overseas for use in mobile phones and other portable devices, as well as in new applications. Sanyo Epson will exhibit the 2.8-inch transflective LTPS LCD at FPD International 2006 organized by Nikkei Business Publications, which will be held from October 18 to 20 at Pacifico Yokohama.

Sanyo Epson LTPS LCD display - Specifications
• Screen size: 7.1 cm / 2.8 inch
• Pixels: 320 x 240 (QVGA)
• Type: Low-temperature polysilicon TFT
• NTSC ratio: Regular (transflective) mode: 70%
• Energy-saving: (reflective) mode: 2%
• Display mode: ECB, transflective
• Pixel pitch: 142 ppi
• Colors Regular: (transflective) mode: 262,144
• Energy-saving: (reflective) mode: 8

About Epson
Epson is a global leader in imaging products including printers, 3LCD projectors and small- and medium-sized LCDs. With an innovative and creative culture, Epson is dedicated to exceeding the vision and expectations of customers worldwide with products known for their superior quality, functionality, compactness and energy efficiency.

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