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Speed of backlight dimming in LED TV?

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eem2am1

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Hello,

We are driving LEDs for TV backlights.

We are doing Analog Dimming, and the LED current maximum is 500mA.

We can change the LED current at a speed of 25mA per millisecond.

Do you think this will be quick enough?

We cannot change the current any faster, as the offline LED driver starts oscillating and switching noisily.

(The LED light is dimmed according to the overall light level of the frame…..so as to increase contrast
…all LEDs are dimmed up/down together…there is no “zonal” dimming)
 

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