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NSC rolls out new architecture, chipset for LCD TVs

Posted: 27 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? point-to-point differential signaling digital interface architecture? ppds architecture? fpd80200? timing controller?

National Semiconductor Corp. (NSC) announced its new point-to-point differential signaling digital interface architecture and chipset for LCD TVs.

According to National, the PPDS architecture enables cinema-quality display performance and smaller bezels, and can support LCD TVs up to 90 inches in diagonal. The architecture also simplifies the design of the intra-panel interconnect to reduce the total number of column driver input signals by up to 50 percent.

"Consumers expect large, thin-profile LCD TVs to match the performance standards of today's CRT and plasma displays, but features such as higher color depth, cinema-quality motion video and high resolution cannot be delivered cost-effectively in LCDs with traditional intra-panel architectures," said Dick McCartney, principal display technologist for National Semiconductor. "National developed the PPDS architecture to bring these features to the consumer while dramatically simplifying the display interconnect and reducing cost for manufacturers."

The PPDS architecture combines a physical layer interface with high-level protocol to create an efficient interface that reduces the overall required PCB size. Capable of delivering more than one billion colors to the display for true 30-bit color, the PPDS architecture is designed to drive large panels up to 90 inches at resolutions up to 1,920 x 1,080 lines.

The company has also developed a timing controller and column driver to support its new PPDS architecture.

The FPD80200 timing controller uses the industry standard FPD-Link input to receive video data, and a PPDS interface output for communication with the column drivers. Unlike traditional panel driving schemes, the gamma conversion occurs in the timing controller instead of the column driver. National said that this enables digitally programmable and independent gamma curves for red, green and blue, providing best-in-class color temperature control.

The FPD80200 operates off a 2.5V digital supply for lower power and lower EMI, but includes 3.3V I/O cells to be compatible with typical gate driver ICs. All of the functions of the timing controller can be programmed with an external EEPROM to enable rapid prototype and product development.

The FPD48084 column driver receives data via the PPDS interface and uses a linear DAC to convert the incoming data to the appropriate output voltage. It also operates at a 2.5V digital supply. Because the column driver uses a linear DAC instead of the traditional nonlinear R-DAC, the total number of reference voltages needed for the gamma curve has been reduced from 18 to 6.

The FPD80200 is available in a 144-pin LQFP package, while the FPD48084 is offered in a tape-carrier package/chip-on-film package. In 1,000-unit quantities, the FPD80200 is priced at $10 and the FPD48084 is available for $5.

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