External compensation circuit and method, and display device
First Claim
Patent Images
1. An external compensation circuit, comprising:
- a regulation sub-circuit, and a compensation sub-circuit;
whereinthe regulation sub-circuit is connected to a reference current source, a current detection terminal of a pixel circuit, a first node and a second node respectively, and configured to regulate a potential at the first node and a potential at the second node according to a reference current provided by the reference current source, and configured to regulate the potential at the second node according to a collected driving current loaded to a light-emitting unit by the pixel circuit;
the compensation sub-circuit is connected to the first node, the second node, and a data signal terminal of the pixel circuit respectively, and configured to calibrate a data signal to be input to the pixel circuit according to a potential difference between the first node and the second node, and input the calibrated data signal to the pixel circuit; and
the regulation sub-circuit comprises;
a current amplifying portion and a potential regulating portion;
whereinthe current amplifying portion is connected to the reference current source, the current detection terminal of the pixel circuit, a third node and a fourth node respectively, and configured to amplify a collected current, and input the current that is amplified to the potential regulating portion through the third node and the fourth node, wherein the current is the reference current or the driving current; and
the potential regulating portion is connected to the first node, the second node, the third node and the fourth node respectively, and configured to regulate the potential at the first node and the potential at the second node according to the reference current that is amplified, and regulate the potential at the second node according to the driving current that is amplified.
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Abstract
Provided are an external compensation circuit and method, and display device in the field of display techniques. The external compensation circuit includes a regulation sub-circuit that may collect a driving current loaded to a light-emitting unit and a reference current from a reference current source, and regulate potentials at two nodes connected to a compensation sub-circuit according to the collected current, to enable the compensation sub-circuit to calibrate a data signal to be input to a pixel circuit according to a potential difference between the two nodes.
11 Citations
20 Claims
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1. An external compensation circuit, comprising:
- a regulation sub-circuit, and a compensation sub-circuit;
whereinthe regulation sub-circuit is connected to a reference current source, a current detection terminal of a pixel circuit, a first node and a second node respectively, and configured to regulate a potential at the first node and a potential at the second node according to a reference current provided by the reference current source, and configured to regulate the potential at the second node according to a collected driving current loaded to a light-emitting unit by the pixel circuit; the compensation sub-circuit is connected to the first node, the second node, and a data signal terminal of the pixel circuit respectively, and configured to calibrate a data signal to be input to the pixel circuit according to a potential difference between the first node and the second node, and input the calibrated data signal to the pixel circuit; and the regulation sub-circuit comprises;
a current amplifying portion and a potential regulating portion;
whereinthe current amplifying portion is connected to the reference current source, the current detection terminal of the pixel circuit, a third node and a fourth node respectively, and configured to amplify a collected current, and input the current that is amplified to the potential regulating portion through the third node and the fourth node, wherein the current is the reference current or the driving current; and the potential regulating portion is connected to the first node, the second node, the third node and the fourth node respectively, and configured to regulate the potential at the first node and the potential at the second node according to the reference current that is amplified, and regulate the potential at the second node according to the driving current that is amplified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a regulation sub-circuit, and a compensation sub-circuit;
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13. An external compensating method, applied to an external compensation circuit, wherein the external compensation circuit comprises:
- a regulation sub-circuit and a compensation sub-circuit;
wherein the regulation sub-circuit is connected to a reference current source, a current detection terminal of a pixel circuit, a first node and a second node respectively; and
the compensation sub-circuit is connected to the first node, the second node, and a data signal terminal of the pixel circuit respectively;
the method comprising;a reset phase, in which the regulation sub-circuit collects a reference current provided by the reference current source, and regulates a potential at the first node and a potential at a second node according to the reference current; and a detecting phase, in which the regulation sub-circuit collects a driving current loaded to a light-emitting unit by the pixel circuit and regulates the potential at the second node according to the driving current, and the compensation sub-circuit calibrates a data signal to be input to the pixel circuit according to a potential difference between the first node and the second node, and inputs a calibrated data signal to the pixel circuit; wherein the regulation sub-circuit comprises;
a current amplifying portion and a potential regulating portion;
whereinthe current amplifying portion is connected to the reference current source, the current detection terminal of the pixel circuit, a third node and a fourth node respectively, and configured to amplify a collected current, and input the current that is amplified to the potential regulating portion through the third node and the fourth node, wherein the current is the reference current or the driving current; and the potential regulating portion is connected to the first node, the second node, the third node and the fourth node respectively, and configured to regulate the potential at the first node and the potential at the second node according to the reference current that is amplified, and regulate the potential at the second node according to the driving current that is amplified. - View Dependent Claims (14, 15, 16)
- a regulation sub-circuit and a compensation sub-circuit;
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17. A display device, comprising:
- a pixel circuit and an external compensation circuit connected to the pixel circuit, wherein the external compensation circuit comprises;
a regulation sub-circuit and a compensation sub-circuit;
whereinthe regulation sub-circuit is connected to a reference current source, a current detection terminal of the pixel circuit, a first node and a second node respectively, and configured to regulate a potential at the first node and a potential at the second node according to a reference current provided by the reference current source, and configured to regulate the potential at the second node according to a collected driving current loaded to the light-emitting unit by the pixel circuit; the compensation sub-circuit is connected to the first node, the second node, and a data signal terminal of the pixel circuit respectively, and configured to calibrate a data signal to be input to the pixel circuit according to a potential difference between the first node and the second node, and input a calibrated data signal to the pixel circuit; and the regulation sub-circuit comprises;
a current amplifying portion and a potential regulating portion;
whereinthe current amplifying portion is connected to the reference current source, the current detection terminal of the pixel circuit, a third node and a fourth node respectively, and configured to amplify a collected current, and input the current that is amplified to the potential regulating portion through the third node and the fourth node, wherein the current is the reference current or the driving current; and the potential regulating portion is connected to the first node, the second node, the third node and the fourth node respectively, and configured to regulate the potential at the first node and the potential at the second node according to the reference current that is amplified, and regulate the potential at the second node according to the driving current that is amplified. - View Dependent Claims (18, 19, 20)
- a pixel circuit and an external compensation circuit connected to the pixel circuit, wherein the external compensation circuit comprises;
Specification