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US 12,592,181 B2Granted
Pixel circuit and micro LED display device including the same
AssigneeLG Display Co., Ltd.
InventorsJinyeong Kim, Wonjun Choi, Hyunwoo Kim
Life of this patent
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Abstract
The present disclosure provides a pixel circuit that may output uniform driving current regardless of the process distribution of the micro-LED element and a micro-LED display device including the same. The pixel circuit includes a micro-LED; a driving transistor that controls the driving current of the micro-LED; a storage capacitor that samples a data voltage that determines the magnitude of the driving current; and an internal compensation circuit that directly resets a first node and a second node respectively corresponding to both opposing electrodes of the storage capacitor before the storage capacitor samples the data voltage.
Claims18
A pixel circuit, comprising:
- a micro-LED;
- a driving transistor configured to control a driving current of the micro-LED;
- a storage capacitor configured to sample a data voltage, wherein a magnitude of the driving current is based on the data voltage;
- and
- an internal compensation circuit configured to directly reset a first node and a second node respectively corresponding to two opposing electrodes of the storage capacitor before the storage capacitor samples the data voltage,
- wherein the internal compensation circuit includes:
- a first reset transistor configured to reset the first node between a gate electrode of the driving transistor and one of the two opposing electrodes of the storage capacitor;
- and
- a second reset transistor configured to reset the second node between a first transistor configured to transmit the data voltage and another one of the two opposing electrodes of the storage capacitor,
- wherein the first reset transistor is configured to reset the first node to a reference voltage, and the second reset transistor is configured to reset the second node to the data voltage.
7 more elements
A micro-LED display device, comprising:
- at least one sub-pixel, wherein each of the at least one sub-pixel includes:
- a micro-LED;
- a driving transistor configured to control a driving current of the micro-LED;
- a storage capacitor configured to sample a data voltage, wherein a magnitude of the driving current is based on the data voltage;
- a first transistor configured to transmit the data voltage to the storage capacitor in response to a first scan signal;
- a second transistor configured to connect a gate electrode and a drain electrode of the driving transistor in response to the first scan signal;
- a first reset transistor configured to reset a first node between the gate electrode of the driving transistor and one of two opposing electrodes of the storage capacitor in response to a second scan signal;
- and
- a second reset transistor configured to reset a second node between the first transistor and another one of the two opposing electrodes of the storage capacitor in response to the second scan signal,
- wherein the first reset transistor is configured to reset the first node to the reference voltage, and the second reset transistor is configured to reset the second node to the data voltage.
7 more elements
A micro-LED display device, comprising:
- a micro-LED configured to emit light based on a driving current;
- a driving transistor configured to receive a power voltage and to control the driving current;
- a storage capacitor having a first electrode corresponding to a first node and connected to a gate electrode of the driving transistor, and a second electrode corresponding to a second node and connected to a first transistor configured to transmit a data voltage, wherein the storage capacitor is configured to sample the data voltage;
- the first transistor configured to transmit the data voltage to the storage capacitor in response to a first scan signal;
- a second transistor configured to connect the gate electrode and a drain electrode of the driving transistor to each other in response to the first scan signal;
- a third transistor configured to transmit a reference voltage to the second node in response to a light-emission signal;
- a fourth transistor connected to and disposed between the driving transistor and the micro-LED, and configured to be turned on in response to the light-emission signal so as to activate a current path of the driving current to the driving transistor;
- a fifth transistor configured to transmit the reference voltage to the first node in response to a second scan signal;
- a sixth transistor configured to transmit the data voltage to the second node in response to the second scan signal;
- and
- a stabilization capacitor connected to and disposed between a source electrode and the gate electrode of the driving transistor.
8 more elements
A pixel circuit, comprising:
- a micro-LED;
- a driving transistor configured to control a driving current of the micro-LED;
- a storage capacitor configured to sample a data voltage, wherein a magnitude of the driving current is based on the data voltage;
- a first transistor configured to transmit the data voltage to the storage capacitor in response to a first scan signal;
- and
- an internal compensation circuit configured to simultaneously reset both opposing electrodes of the storage capacitor in response to a second scan signal,
- wherein an enable period of the first scan signal and an enable period of the second scan signal do not overlap each other, and
- wherein the internal compensation circuit includes:
- a first reset transistor configured to reset the first node between a gate electrode of the driving transistor and one of the two opposing electrodes of the storage capacitor;
- and
- a second reset transistor configured to reset the second node between a first transistor configured to transmit the data voltage and another one of the two opposing electrodes of the storage capacitor,
- wherein the first reset transistor is configured to reset the first node to a reference voltage, and the second reset transistor is configured to reset the second node to the data voltage.
9 more elements
Dependencies are inferred from the claim text.