Display apparatus and method of driving the same
AssigneeSamsung Display Co., Ltd.
InventorsGunwoo YANG, Cholho KIM, Wonjun LEE
Life of this patent
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Abstract
A display apparatus includes a voltage generator which generates an initial controlling signal which comprises a high voltage, a middle voltage and a low voltage, where the initial controlling signal swings from the middle voltage to the low voltage after a plurality of gate signals is simultaneously dropped from a high voltage to a low voltage thereof.
Claims20
A display apparatus comprising:
- a gate driver which sequentially outputs a plurality of gate signals to a plurality of gate lines;
- a display part comprising a pixel which comprises:
- a first capacitor connected between a first voltage line receiving an initialization driving signal and a first node,
- a first transistor which comprises a control electrode connected to the first node, a first electrode connected to a second voltage line receiving a first power source signal and a second electrode connected to a second node,
- an organic light emitting diode which comprises an anode electrode connected to the second node and a cathode electrode receiving a second power source signal,
- a second capacitor connected between a data line and the second node,
- a second transistor which comprises a control electrode connected to an n-th gate line of the plurality of gate lines, a first electrode connected to the first node and a second electrode connected to the second node, wherein ‘n’ is a natural number, and
- a third transistor which comprises a control electrode connected to a third voltage line receiving an initialization controlling signal, a first electrode connected to the first voltage line and a second electrode connected to the second node;
- and
- a voltage generator which generates the initial driving signal which comprises a high voltage, a middle voltage and a low voltage,
- wherein the initial driving signal swings from the middle voltage to the low voltage thereof after the plurality of gate signals is simultaneously dropped from a high voltage to a low voltage of the plurality of gate signals.
A method of driving a display apparatus comprising a pixel which comprises a first capacitor connected between a first voltage line receiving an initialization driving signal and a first node, a first transistor which comprises a control electrode connected to the first node, a first electrode connected to a second voltage line receiving a first power source signal and a second electrode connected to a second node, an organic light emitting diode which comprises an anode electrode connected to the second node and a cathode electrode receiving a second power source signal, a second capacitor connected between a data line and the second node, a second transistor which comprises a control electrode connected to an n-th gate line of a plurality of gate lines, a first electrode connected to the first node and a second electrode connected to the second node, and a third transistor which comprises a control electrode connected to a third voltage line receiving an initialization controlling signal, a first electrode connected to the first voltage line and a second electrode connected to the second node, wherein ‘n’ is a natural number), the method comprising:
- (a) generating an initial driving signal comprising one of a high voltage, a middle voltage and a low voltage at once;
- (b) initializing an anode electrode of the organic light emitting diode connected to the second electrode of the first transistor using the initial driving signal received from the first voltage line;
- (c) applying a low voltage of a first power source signal to the first electrode of the first transistor such that the first transistor is diode-coupled and a threshold voltage of the first transistor is compensated;
- (d) receiving the initial driving signal which swings from the middle voltage to the low voltage after a plurality of gate signals applied to the plurality of gate lines is simultaneously dropped from a high voltage to a low voltage thereof;
- (e) applying a voltage divided by the first and second capacitors from a data voltage received through the data line to the first node during a period when only the n-th gate line of the plurality of gate lines receives a high voltage of the plurality of gate signals;
- and
- (f) emitting light by the organic light emitting diode based on the divided voltage applied to the first node in response to the initial driving signal received from the first voltage line.
Dependencies are inferred from the claim text.