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Optoelectronics/Displays??

LED driver has silent error detection feature

Posted: 21 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:constant current LED driver? silent error detection?

MBI5039

Macroblock has expanded its line of constant current LED driver with silent error detection with the MBI5039 device aimed at LED panel applications.

The MBI5039 is a 16-channel constant current LED driver with smart error detection functions. The MBI5039 supports constant output current from 3mA to 90mA and sustains up to 17V at the output ports. In addition, the high clock frequency (30MHz) satisfies the system requirements of high volume data transmission. The MBI5039 includes two error-detection functions: in-message error detection and silent error detection. The in-message error detection function performs online detection as data-in and error-out sequentially, making it easy to identify the LED open and short errors and report the exact position of the broken LED simultaneously. Moreover, the silent error detection features full LED panel detection to detect even dark pixels in real time, and moreover, the silent error detection can diagnose the LED at low current (0.1mA) within short period (500ns) to avoid flickers or noise on the LED panel, assuring the accuracy of the display information.

In addition to the two featured error detections, thermal detection is also an add-in feature in the MBI5039 to protect the system from over-temperature. Moreover, the MBI5039 provides a 64-step programmable current gain for LED brightness and uniformity adjustment. For better display uniformity, the MBI5039 further achieves excellent output current accuracy within 1.5 percent variation between channels and within 3 percent variation between ICs. The MBI5039 also delivers fast response of output current with minimum output pulse at 35ns, which greatly enhances the gray scale and the visual refresh rate of the LED panel.

The MBI5039 can be a drop-in replacement of MBI5025/MBI5026/MBI5027/MBI5028/MBI5029 by Macroblock's patented Share-I-O technique. The MBI5039 enhances the display quality while achieving the full LED panel detection and real-time online error report to reduce the maintenance cost.




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