新聞資訊
News
2005年的新聞資訊
LCD Display Serial Interface Standards Expanded for Multi-Function Mobile Phones
Development Underway for 450-Mb/sec MSDL3 Compatible with LCDs with Greater than
VGA Resolution and Provides Solutions for Future Multi Functionality
08.04.2005
ROHM CO., LTD. recently completed development of MSDL2, an LCD serial interface technology for multi-function mobile phones that builds on the previous MSDL technology to deliver transmission speeds of 200 Mb/sec. Development of MSDL3, which promises speeds of up to 450 Mb/sec. Samples of the BU7960GU MSDL3 transceiver are scheduled to ship in October 2005.
MSDL ("Mobile Shrink Data Link") is ROHM's unique technology for high-speed differential serial transmission designed for high-speed, low-EMI, low-power-consumption data transmission for mobile phone displays. Mass production of MSDL transceivers for mobile phone LCD display interfaces began in May 2004, and over 7 million have already been shipped.
MSDL2 takes MSDL's 100 Mb/sec transmission speed per data channel to another level, delivering 200 Mb/sec. QVGA-class displays (240×320 pixels) require 6 differential wires with conventional MSDL, but with MSDL2 only 4 are required for data transmission. If 6 are used, then compatibility is expanded to include HVGA-class (320×480 pixels) displays. ROHM plans to continue making the MSDL2 into products as interfaces with built-in liquid crystal drivers for mobile phones.
MSDL3 delivers speeds up to 450 Mb/sec per channel, and is compatible with SVGA-class LCDs (800×600 pixels) using six differential wires. That means that it will be compatible when ultra-high resolution displays are adopted for third generation mobile phones. In order to meet the increasing demand for this kind of high-speed data transmission, ROHM has switched to a Sub-LVDS system for data transmission for MSDL3, and has developed the BU7960GU transceiver LSI.
· Features
- MSDL3: Max. per-channel transmission rate of 450 Mb/sec
- Interfaces: 24-bit RGB, Hsync, Vsync, DE, PCLK
- Serial interface: CLK +/-, DATA1 +/-, DATA2 +/-
- 1 or 2 channels can be chosen to match the data rate.
- Power-saving mode using clock detection
Depending on the application MSDL2 or MSDL3 can be chosen, with MSDL2 good for resolutions up to HVGA-class and low-power consumption interfaces, while MSDL3 is positioned for interfaces compatible with higher resolutions.
|
Serial Interface (MSDL) |
Parallel Interface |
Compatible resolutions |
| System |
No. of channels |
Data rate |
Resolution |
No. of colors |
| MSDL |
current-mode |
CLK 1ch
Data 2ch |
200Mbps/2ch |
RGB 18bit
HS,VS |
QVGA |
260,000 |
| MSDL2 |
current-mode |
CLK 1ch
Data 1ch/2ch |
400Mbps/2ch |
RGB 18bit
HS,VS,DE |
QVGA
to HVGA |
260,000 |
| MSDL3 |
sub-LVDS |
CLK 1ch
Data 1ch/2ch |
900Mbps/2ch |
RGB 24bit
HS,VS,DE |
QVGA
to SVGA |
16,770,000 |
Rapidly-spreading third-generation mobile phones have seen a stupendous growth in the amount of data transmitted due to higher resolution and number of colors in the displays, causing problems with EMI noise due to the greater number of wires inside.
At the same time, a mobile phone's design has become an important factor in product differentiation, so many have flip-top or swiveling displays with complex hinge mechanisms. Such case designs have been hampered by a greater number of wires inside and measures to suppress EMI noise, which also lead to a drop in mechanical reliability. To solve these problems, a differential serial transmission technology was needed for mobile phones that would reduce EMI noise and the number of wires.
ROHM's MSDL delivers exactly that - high-speed differential serial data transmission that simultaneously reduces the EMI noise and the number of wires passing through the hinges which had been such a headache for set makers, thereby improving freedom in set design and contributing to higher quality.
ROHM's unique high-speed serial transmission technologies will continue to meet a whole array of needs, including the higher resolution, more colors, and video rendering that displays will require to ensure compatibility with internet, gaming, and digital TV viewing applications in third-generation mobile phones.
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