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US 12,700,347 B2Granted
Pixel circuit and display device having the same
AssigneeSamsung Display Co., Ltd.
InventorGichang Lee
Life of this patent
Estimating the term…
Abstract
A pixel circuit includes a voltage applier which generates an alternating control voltage based on a data voltage and a sweep voltage, an alternating signal generator which outputs an alternating signal based on the alternating control voltage, an emission controller which applies a driving current to a light emitting element in response to an emission signal and the alternating signal, and the light emitting element connected to the emission controller.
Claims17
A pixel circuit comprising:
- a voltage applier which generates an alternating control voltage based on a data voltage and a sweep voltage;
- an alternating signal generator which outputs an alternating signal based on the alternating control voltage;
- an emission controller which applies a driving current to a light emitting element in response to an emission signal and the alternating signal;
- and
- the light emitting element connected to the emission controller,
- wherein the alternating signal generator includes:
- a first alternating signal control transistor which applies a voltage of an output node of a ring oscillator to an input node of the ring oscillator in response to the alternating control voltage;
- the ring oscillator which outputs the alternating signal;
- and
- a second alternating signal control transistor which applies a low voltage to the ring oscillator in response to the alternating control voltage.
7 more elements
A display device comprising:
- a display panel including a pixel circuit;
- a data driver which applies a data voltage to the display panel;
- a gate driver which outputs a gate signal to the display panel;
- a sweep voltage generator which applies a sweep voltage to the display panel;
- and
- an emission driver which applies an emission signal to the display panel,
- wherein the pixel circuit includes:
- a voltage applier which generates an alternating control voltage based on the data voltage and the sweep voltage;
- an alternating signal generator which outputs an alternating signal based on the alternating control voltage;
- an emission controller which applies a driving current to a light emitting element in response to the emission signal and the alternating signal;
- and
- the light emitting element connected to the emission controller, and wherein the alternating signal generator includes:
- a first alternating signal control transistor which applies a voltage of an output node of a ring oscillator to an input node of the ring oscillator in response to the alternating control voltage;
- the ring oscillator which outputs the alternating signal;
- and
- a second alternating signal control transistor which applies a low voltage to the ring oscillator in response to the alternating control voltage.
13 more elements
An electronic device comprising:
- a display panel including a pixel circuit;
- a data driver which applies a data voltage to the display panel;
- a gate driver which outputs a gate signal to the display panel;
- a sweep voltage generator which applies a sweep voltage to the display panel;
- an emission driver which applies an emission signal to the display panel;
- a driving controller which controls the data driver, the gate driver, the sweep voltage generator and the emission driver based on an input control signal;
- and
- a processor which outputs the input control signal,
- wherein the pixel circuit includes:
- a voltage applier which generates an alternating control voltage based on the data voltage and the sweep voltage;
- an alternating signal generator which outputs an alternating signal based on the alternating control voltage;
- an emission controller which applies a driving current to a light emitting element in response to the emission signal and the alternating signal;
- and
- the light emitting element connected to the emission controller, and wherein the alternating signal generator includes:
- a first alternating signal control transistor which applies a voltage of an output node of a ring oscillator to an input node of the ring oscillator in response to the alternating control voltage;
- the ring oscillator which outputs the alternating signal;
- and
- a second alternating signal control transistor which applies a low voltage to the ring oscillator in response to the alternating control voltage.
15 more elements
Dependencies are inferred from the claim text.