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US 10,483,482 B2Granted
Display apparatus
AssigneeTianma Microelectronics Co., Ltd.
InventorsYoshihiro Nonaka, Jiro Yanase, Kenichi Takatori
Life of this patent
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Abstract
Provided is a display apparatus that compensates a drive transistor threshold to attain a highly precise structure. The display apparatus comprises a light emitting element including a first electrode, a second electrode and an organic light emitting layer disposed between the first electrode and the second electrode, and a pixel circuit including a capacitor and a drive transistor letting current according to voltage of the capacitor flow in the light emitting element. The pixel circuit stops supply of current to the light emitting element while connecting the capacitor to the first electrode.
Claims15
A display apparatus, comprising:
- a light emitting element including a first electrode, a second electrode, and an organic light emitting layer disposed between the first electrode and the second electrode;
- and
- a pixel circuit including a capacitor and a drive transistor letting current according to voltage of the capacitor flow in the light emitting element,
- wherein the pixel circuit stops supply of current to the light emitting element while connecting the capacitor to the first electrode and the capacitor is initialized by applying a potential of the first electrode of the light emitting element to the capacitor, and
- wherein, after the initialization of the capacitor, the pixel circuit disconnects the capacitor from the first electrode to store threshold voltage of the drive transistor and data voltage corresponding to emission luminance of the light emitting element in the capacitor.
2 more elements
A display apparatus, comprising:
- a light emitting element including a first electrode, a second electrode, and an organic light emitting layer disposed between the first electrode and the second electrode;
- and
- a pixel circuit including a capacitor and a drive transistor letting current according to voltage of the capacitor flow in the light emitting element,
- wherein the drive transistor has a third electrode and a fourth electrode, and controls current to flow between the third electrode and the fourth electrode in accordance with voltage applied to a gate of the drive transistor,
- wherein the pixel circuit further includes a first control element to a third control element, each of the first to third control elements including a fifth electrode and a sixth electrode and controlling conduction state of the fifth electrode and the sixth electrode, and a fourth control element having a seventh electrode and an eighth electrode and controlling conduction state of the seventh electrode and the eighth electrode,
- wherein the fourth electrode of the drive transistor is connected to the first electrode,
- wherein the fifth electrode of the first control element is connected to the capacitor, whereas the sixth electrode of the first control element is connected to the gate,
- wherein the fifth electrode of the second control element is connected to a reference power supply, whereas the sixth electrode of the second control element is connected to the capacitor and to the fifth electrode of the first control element,
- wherein the fifth electrode of the third control element is connected to a first power supply which supplies current to flow in the light emitting element, whereas the sixth electrode of the third control element is connected to the capacitor and to the fourth electrode, and
- wherein the seventh electrode of the fourth control element is connected to a data line supplying data voltage according to emission luminance of the light emitting element, whereas the eighth electrode of the fourth control element is connected to the gate and to the sixth electrode of the first control element.
7 more elements
A display apparatus, comprising:
- a light emitting element including a first electrode, a second electrode, and an organic light emitting layer disposed between the first electrode and the second electrode;
- and
- a pixel circuit including a capacitor and a drive transistor letting current according to voltage of the capacitor flow in the light emitting element,
- wherein the drive transistor has a third electrode and a fourth electrode, and controls current to flow between the third electrode and the fourth electrode in accordance with voltage applied to a gate of the drive transistor,
- wherein the pixel circuit further includes a first control element to a third control element, each of the first to third control elements including a fifth electrode and a sixth electrode and controlling conduction state of the fifth electrode and the sixth electrode, and a fourth control element having a seventh electrode and an eighth electrode and controlling conduction state of the seventh electrode and the eighth electrode,
- wherein the fifth electrode of the first control element is connected to the fourth electrode, whereas the sixth electrode of the first control element is connected to the capacitor and to the first electrode,
- wherein the sixth electrode of the second control element is connected to the capacitor and to the gate,
- wherein the fifth electrode of the third control element is connected to a first power supply which supplies current to flow in the light emitting element, whereas the sixth electrode of the third control element is connected to the third electrode and to the fifth electrode of the second control element, and
- wherein the seventh electrode of the fourth control element is connected to a data line supplying data voltage according to emission luminance of the light emitting element, whereas the eighth electrode of the fourth control element is connected to the fourth electrode and to the fifth electrode of the first control element.
6 more elements
A display apparatus, comprising:
- a light emitting element including a first electrode, a second electrode, and an organic light emitting layer disposed between the first electrode and the second electrode;
- and
- a pixel circuit including a capacitor and a drive transistor letting current according to voltage of the capacitor flow in the light emitting element,
- wherein the drive transistor has a third electrode and a fourth electrode, and controls current to flow between the third electrode and the fourth electrode in accordance with voltage applied to a gate of the drive transistor,
- wherein the pixel circuit further includes a first control element to a third control element, each of the first to third control elements including a fifth electrode and a sixth electrode and controlling conduction state of the fifth electrode and the sixth electrode, and a fourth control element having a seventh electrode and an eighth electrode and controlling conduction state of the seventh electrode and the eighth electrode,
- wherein the third electrode of the drive transistor is connected to a first power supply which supplies current to flow in the light emitting element,
- wherein the fifth electrode of the first control element is connected to the gate, whereas the sixth electrode of the first control element is connected to the capacitor,
- wherein the fifth electrode of the second control element is connected to a reference power supply, whereas the sixth electrode of the second control element is connected to the capacitor and to the sixth electrode of the first control element,
- wherein the fifth electrode of the third control element is connected to the capacitor and to the fourth electrode, whereas the sixth electrode of the third control element is connected to the first electrode, and
- wherein the seventh electrode of the fourth control element is connected to a data line supplying data voltage according to emission luminance of the light emitting element, whereas the eighth electrode of the fourth control element is connected to the gate and to the fifth electrode of the first control element.
7 more elements
Dependencies are inferred from the claim text.