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Mobile CMADS™ Merit
Mobile CMADS™ (Current Mode Advanced Differential Signaling) is a high-speed serial interface standard for performing image data transfer to an LCD.
With the advancing resolution of displays and cameras used in mobile phones, designers now require a high degree of freedom and variations to execute device design.
The device design must not only support increases in signal lines from large capacity communication data and counteract accompanying EMI noise, but also control power consumption while implementing as thin as possible hinge wiring to achieve the flexible housing design represented by revolver-type mobile phones.
The mobile CMADS compatible LCD driver IC from NEC Electronics responds to these demands, achieving reductions in the number of parts, miniaturization, a simplified layout with high resolution, low EMI, and low power consumption, thanks to the company's original high-speed serial transfer technology.
Reduction of the number of data transmission lines
The device design must not only support increases in signal lines from large capacity communication data and counteract accompanying EMI noise, but also control power consumption while implementing as thin as possible hinge wiring to achieve the flexible housing design represented by revolver-type mobile phones. The employment of the Mobile CMADS system reduces the amount of data wiring, miniaturizes the graphics controller IC package and flexible circuit board and contributes to downsizing of the customer's set.
the example applied Mobile CMADS™
Low EMI Noise
Mobile CMADS enables low amplitude communications via the company's original high-speed serial transfer technology, and achieves a lower EMI noise than CMOS parallel or CMOS serial interfaces. This enables fewer EMI filter parts, which leads to fewer parts in total as well as set miniaturization. Mobile CMADS also resolves EMI problems throughout the set caused by heavier image data transfer, and enables a high LCD resolution and a simplified EMI design for set devices.
the result of EMI measurement : (left)Mobile CMADS, (right) CMOS
the size of screen : a-si TFT 120 to 160pixel, frame rate : 60frame/sec
Low Power Consumption
Mobile devices require function improvements and low power consumption. The addition of digital still camera (DSC) and audio functions have led to an increase in the volume of transfer data to be processed. Mobile CMADS current consumption is about 0.6 to 1 mA per receiver, making it lower than CMOS serial interfaces or mini LVDS.
Simplified Design
The transmitter circuit is configured as an Nch open drain, providing high portability while simplifying installation in the customer's application chip. This enables a simpler set design because the often unstable analog circuit required in the past no longer needs to be built into the transmitter side.
Supported Product Lineup
NEC Electronics has already released products that support Mobile CMADS with the above features, and now provides LCD driver ICs and bridge ICs that simplify external attachment to the customer's current parallel system CPUs.
