MD5026AA SSOP-HUA HUI(HONGKONG)ELECTRON LIMITED

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MD5026AA SSOP

Product Numbers: 2012117115127

Product description: MD5026AA

INTRODUCTION

l   How LED Driver IC supports high Grayscale and Refresh-Rate performance on LED Panel

LED is driven by constant current and we can use the PWM method (Constant Current Pulse Width Modulation) to achieve the brightness control of LED. Therefore, if we bypass the detail design of the LED Panel Control System, simply focus on the driving speed requirement of the LED Panel. The panel Refresh-Rate is decided by the time of address searching (Tacc) and the Min. Constant Current Pulse Width which mainly depends on the current(I) driving speed capability of the LED Driver IC.

For example, if a outdoor full color LED Panel with 768 pixel address, it can be simply figured out that the (Tacc) time is associated with system CLK Freq. For CLK Freq. 10Mhz->768*0.1us=76.8us, the (Tacc) is 76.8us, and 30Mhz->768*0.033us=25.6us. The (Tacc) time will achieve 3 times reduction if the CLK Freq. speeds up from 10Mhz to 30Mhz.

To upgrade the Grayscale of LED Panel, the current(I) driving speed capability (generally defined as the Spec. of Min. OE Response Time ) of the LED Driver IC is mainly affected. The Min. OE response time of traditional LED driver IC in the market is about 250ns. For 8 bits grayscale applied on LED Panel, it means that the R/G/B can individually present 256 grayscale and totally present 256*256*256=16777216 Color State (It can be associated with the Full-Color 32bit setting of LCD monitor). And if we want to upgrade the grayscale to 14 bits, 16384X16384X16384=4398 billion color state, the Max. Refresh-Rate of the LED Panel will also degrade. The following is about a calculation example between Grayscale and Refresh-Rate.

A.     Tradition Driver IC (Support 250ns Min. OE Response Time)

Set the weight as 1/64,1/321,22048

Tfr=25.6*(6+4095)+5*4=1786.4(us)

Fr=559.7 Hz

B.     GrayscaleBoostTM Driver IC (Support 25ns Min. OE Response Time)

Set the weight as 1/1024,1/321,2128

Tfr=25.6*(10+255)+9*4=146.6 Hz

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