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US 12,475,834 B2Granted
Light emitting diode (LED) display device accurately sensing exponential current in pixel sensing circuit
AssigneeSamsung Display Co., Ltd.
InventorsYoung Soo Hwang, Sung-Chan Jo
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Abstract
A display device includes: a pixel including a light emitting element; and a sensing channel connected to a first electrode of the light emitting element by a first sensing line, and connected to a second electrode of the light emitting element by a second sensing line. The sensing channel includes: an amplifier including a first input terminal connected to the second sensing line; and a first switch which connects an output terminal of the amplifier to the first sensing line.
Claims17
A display device comprising:
- a pixel including a light emitting element;
- and
- a sensing channel connected to a cathode electrode of the light emitting element by a first sensing line, and connected to an anode electrode of the light emitting element by a second sensing line,
- wherein the sensing channel comprises:
- an amplifier including a first input terminal directly connected to the second sensing line;
- and
- a first switch which directly connects an output terminal of the amplifier to the first sensing line,
- wherein the display device further comprises a second switch which connects the cathode electrode of the light emitting element to a first power line,
- wherein the pixel comprises a first transistor including a gate electrode connected to a first node, a first electrode connected to a second power line, and a second electrode connected to a second node,
- wherein, during a first period of a threshold voltage sensing period of the first transistor, the first switch is in a turned-off state, and the second switch is in a turned-on state, and
- during a second period after the first period, the first switch is in a turned-on state, and the second switch is in a turned-off state.
8 more elements
A display device comprising:
- a pixel including a light emitting element;
- and
- a sensing channel connected to a cathode electrode of the light emitting element by a first sensing line, and connected to at least one transistor of the pixel by a second sensing line,
- wherein the sensing channel comprises:
- an amplifier including a first input terminal directly connected to the second sensing line;
- and
- a first switch which directly connects an output terminal of the amplifier to the first sensing line;
- and
- wherein the display device further comprises a second switch which connects the cathode electrode of the light emitting element to a first power line,
- wherein the pixel comprises a first transistor including a gate electrode connected to a first node, a first electrode connected to a second power line, and a second electrode connected to a second node,
- wherein, during a first period of a threshold voltage sensing period of the first transistor, the first switch is in a turned-off state, and the second switch is in a turned-on state, and
- during a second period after the first period, the first switch is in a turned-on state, and the second switch is in a turned-off state.
9 more elements
Dependencies are inferred from the claim text.