LED display driving circuit for compensating shorted LED and display device thereof

A light-emitting diode (LED) display device comprising:

• a display panel including a plurality of LEDs disposed in a plurality of sub-pixels where a plurality of channel lines and a plurality of scan lines intersect;
• and
• an LED display driving circuit configured to supply a channel current to the plurality of LEDs and allow the plurality of LEDs to emit light,
• wherein the LED display driving circuit includes:
• a channel driving circuit configured to supply the channel current through each channel line according to a pulse width modulation (PWM) control signal;
• a scan driving circuit including a plurality of scan switches connected to a plurality of scan lines and selectively turned on or off according to a scan signal to select a scan line connected to LEDs to emit light, and a plurality of precharge switches connected to the plurality of scan lines and configured to operate complementarily with the scan switches according to a precharge control signal, and turned on when each of the scan switches is turned off to supply a precharge voltage to a corresponding scan line;
• and
• a data controller configured to generate the PWM control signal, the scan signal, and the precharge control signal and maintain a target scan line in a floating state by turning off a precharge switch connected to the target scan line when the scan switch of the target scan line to which a shorted LED is connected is turned off when the shorted LED among the plurality of LEDs is detected,
• wherein the channel driving circuit includes:
• a plurality of channel current sources disposed for each of the channel lines and configured to generate a channel current to be supplied through each channel line using an externally supplied voltage;
• a plurality of PWM switches connected between the channel lines and the channel current sources and turned on or off according to the PWM control signal to control an amount of the channel current supplied to each channel line;
• and
• a short detection circuit configured to detect the shorted LED among the plurality of LEDs, and
• wherein the data controller generates the PWM control signal for turning off a PWM switch of a target channel line to which the shorted LED is connected during a turn-on period of the scan switch of the target scan line.

A light-emitting diode (LED) display device comprising:

• a display panel including a plurality of LEDs disposed in a plurality of sub-pixels where a plurality of channel lines and a plurality of scan lines intersect;
• and
• an LED display driving circuit configured to supply a channel current to the plurality of LEDs and allow the plurality of LEDs to emit light,
• wherein the LED display driving circuit includes:
• a channel driving circuit configured to supply the channel current through each channel line according to a pulse width modulation (PWM) control signal;
• a scan driving circuit including a plurality of scan switches connected to a plurality of scan lines and selectively turned on or off according to a scan signal to select a scan line connected to LEDs to emit light, and a plurality of precharge switches connected to the plurality of scan lines and configured to operate complementarily with the scan switches according to a precharge control signal, and turned on when each of the scan switches is turned off to supply a precharge voltage to a corresponding scan line;
• and
• a data controller configured to generate the PWM control signal, the scan signal, and the precharge control signal and maintain a target scan line in a floating state by turning off a precharge switch connected to the target scan line when the scan switch of the target scan line to which a shorted LED is connected is turned off when the shorted LED among the plurality of LEDs is detected,
• wherein the channel driving circuit includes a short detection circuit configured to detect the shorted LED among the plurality of LEDs, and the short detection circuit determines whether each LED is shorted based on a channel voltage of each channel line according to the channel current supplied through each channel line when a specific scan line is selected by the scan driving circuit.