Patent ID: 8664890
Filing Date: 2014-03-04
Classification: G09G

Abstract:
1. An LED display device for providing current correction, comprising: a storage unit storing a standard voltage; a microprocessor comprising: a feedback voltage generating module, wherein, the feedback voltage generating module comprises a resistor, the resistor is connected between the feedback port and ground; and a plurality of LED modules connected in parallel between a high potential point and the resistor, each LED module being connected to one output port; wherein, upon a condition that the trigger module produces a trigger signal, the current correction module controls each of the plurality of output ports to output a pulse width modulation (PWM) signal to turn on one of the plurality of LED modules connected to the output port in sequence; the feedback voltage generating module produces a feedback voltage reflecting current through one of the LED modules which is turned on in sequence; the current correction module receives the feedback voltage via the feedback port and compares the feedback voltage with the standard voltage stored in the storage unit, and adjusts the PWM signal output by the output port connected to the LED module which is turned on if the feedback voltage does not equal the standard voltage.