Macroblock launches 16-Bit PWM LED driver with 8-bit digital dot correction for high-end LED display

May 19, 2009
Date Announced: 19 May 2009 Hsinchu, Taiwan -- Macroblock launches a new 16-bit PWM LED driver with 8-bit digital dot correction, MBI5040. To provide uniformed LED brightness and accurate LED color for high-end LED display panels, “matched LEDs” are insufficient, and dot correction of each LED pixel becomes necessary. However, it is costly and complex to process dot correction through controllers for the increasing loading of the controllers and the limited control of LED pixels. The new digital dot correction designed in MBI5040 not only unifies the LED brightness and avoids the LED color change during the dot correction process, but also reduces the loading and the cost of controllers.There are two kinds of dot correction methods in the market, analog and digital dot corrections. However, analog dot correction usually results in the LED wavelength shift, which may cause the color change of LED. MBI5040 especially features 8-bit digital dot correction to compensate individual LED brightness at the same visual refresh rate. In addition, a patented circuit is built-in to multiply the grayscale data and dot correction data. Therefore, MBI5040 provides the flexibility to adjust the overall LED brightness with the changes of ambient lighting and ensures the LED brightness uniformity without concerning the inaccurate LED color or sacrificing the gray scales of the video image or the visual refresh rate during the dot correction process. MBI5040 also features 16-bit gray scale with patented S-PWM technology to increase visual refresh rate. Along with the flexibility of 8-bit digital dot correction and 16-bit gray scale control with high visual refresh rate, MBI5040 helps simplify the design of controller with lower FPGA grade, so that the overall design cost of controller may come down. MBI5040 helps upgrade LED display panels to high-end LED display panels easily, making it more applicable for outdoor and indoor LED video displays, billboards, and commercial LED displays with an affordable IC price.In addition to the 16-bit PWM control and 8-bit digital dot correction features, MBI5040 provides constant output current from 2mA to 60mA for 16 output channels individually, and sustains up to 17V at each output port. MBI5040 is also designed with compulsory error detection, in-message error detection, 7-bit output current gain and thermal protection functions.


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