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Dialog LCD drivers have fully integrated graphic display RAM

Posted: 29 Jun 2004 ?? ?Print Version ?Bookmark and Share

Keywords:dialog semiconductor? liquid crystal display driver? lcd driver? da8912a? da8913a?

Dialog Semiconductor Plc launched the first two products in its new color LCD driver family.

Using multiline addressing (MLA) LCD technology, the DA8912A and DA8913A incorporate fully integrated graphic display RAM with high speed interfaces and various power management functions to enable a single, low power chip for managing the display.

The fast display graphic transfer rate of the new LCD drivers, with support for moving images at speeds faster than 15fps, makes the devices suitable for next-generation mobile phone handsets with advanced multimedia, multiple display and video and gaming capabilities. According to the company, this is the result of the advantages of MLA technology which facilitate lower LCD drive voltage requirements, reduced power needs, fast frame response time, improved display contrast and quality, and reduced noise on the display.

The color LCD drivers are manufactured using Chartered Semiconductor Mfg's 0.35?m process, and OTP (one-time programmable) nonvolatile memory technology from eMemory Technology Inc.

The OTP memory is delivered as an IP block to replace the traditional fuses required to adjust LCD driver color contrast, while the OTP block, customized for Dialog's specific requirements, removes the need to run a set-up trim at chip testing, saving assembly time and cost. The electrical programmable memory enables the flexibility of adjusting display parameters at module assembly stage.

"Our new DA8912A/8913A ICs provide real innovation for the mobile phone display market, delivering superior color performance and low power consumption, while providing mobile phone handset makers the flexibility to customize display parameters for creating differentiation," said CEO and President Roland Pudelko.

The new devices are designed to drive color super-twisted nematic (STN) displays with a maximum size of 132 columns by 132 rows (DA8912A) or 96 columns by 96 rows (DA8913A), and support resolutions of either 4,096 or 65,536 colors. The DA8912A also features programmable on-chip temperature compensation to enable optimum display quality.

With a 278,784 bit low power display RAM to store color data, the DA8912A/8913A support both display scrolling and partial display capability with data written into the RAM by a user-configurable microprocessor unit interface. A high-speed serial or 8/16-bit parallel interface enables fast graphic data transfers as well as rewriting of data to the graphic display RAM. Other key features of the display capability of the LCD drivers include a pointer management system which automatically increments or decrements the RAM pointer after each access, allowing data to be streamed into RAM without having to manipulate any address pointers, and a

programmable color enhancement function for individual optimization of the RGB palettes.

The drivers feature low voltage operation down to 2.4V, while programmable voltage booster circuits support a maximum LCD drive voltage of 21V. All LCD voltage reference and generation

circuits plus output drivers are also included on-chip.

Typical power consumption is 0.5mA (including display load) for the DA8913A 96x96 graphic CSTN LCD display driver, while the DA8912A 132x132 driver has a typical power consumption of 0.9mA. Both devices feature a standby consumption of 10?A.

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