US 11,657,763 B2
Display device and method of driving the same
Dong Ju Kim, Paju-si (KR); Soon Dong Cho, Gumi-si (KR); Jun O Hur, Daegu (KR); Dong Won Park, Goyang-si (KR); and Won Yong Jang, Bucheon-si (KR)
Assigned to LG Display Co., Ltd., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Sep. 30, 2021, as Appl. No. 17/491,346.
Claims priority of application No. 10-2020-0127925 (KR), filed on Oct. 5, 2020.
Prior Publication US 2022/0108659 A1, Apr. 7, 2022
Int. Cl. G09G 3/00 (2006.01); G09G 3/3266 (2016.01); G09G 3/36 (2006.01)
CPC G09G 3/3266 (2013.01) [G09G 3/3674 (2013.01); G09G 2310/0286 (2013.01); G09G 2310/0289 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A display device comprising:
a display panel displaying an image;
a scan driver configured to apply scan signals to the display panel; and
a power supply configured to apply a first gate high voltage and a gate low voltage to the scan driver,
wherein the scan driver discharges the display panel based on a second gate high voltage lower than the first gate high voltage during a discharging operation of the display panel, and
wherein the second gate high voltage has a level between the first gate high voltage and a ground voltage,
wherein the scan driver comprises a logic controller configured to monitor the first gate high voltage and a gate all high signal for simultaneously switching the states of the scan signals and, when the first gate high voltage is dropped to an internally set voltage level, control output of the first gate high voltage based on a discharge enable signal that enables discharging of the display panel,
wherein the logic controller comprising a voltage monitor, and
wherein the voltage monitor comprises:
a first monitoring resistor having one end connected to a gate high voltage line through which the first gate high voltage is transmitted;
a second monitoring resistor having one end connected to the other end of the first monitoring resistor and the other end connected to a ground line;
a first comparator having an inverting terminal connected between the other end of the first monitoring resistor and the one end of the second monitoring resistor, and a non-inverting terminal connected to a first reference voltage line;
an inverter having an input terminal connected to an all high signal line through which the gate all high signal is transmitted; and
an AND gate having a first input terminal connected to an output terminal of the inverter, a second input terminal connected to an output terminal of the first comparator, and an output terminal connected to an input terminal of a discharge controller configured to output the discharging enable signal.