Back to results
US 2017/0249898 A1Published application
Pixel circuit and driving method thereof, display substrate, and display apparatus
AssigneeBoe Technology Group Co., Ltd.
InventorZhanjie MA
Life of this patent
Estimating the term…
Abstract
The present disclosure provides a pixel circuit, a driving method, a display substrate, and a display apparatus. The pixel circuit includes a driving module, a capacitor module, a threshold voltage compensation and light emission control module, an electroluminescence module, a data voltage write module and a reset module. A driving current flowing through the electroluminescence module may be less than or even not influenced by the threshold voltage of a driving transistor, thus at least partially addressing the non-uniformity of display luminance due to drift of the threshold voltage of the driving transistor.
Claims20
A pixel circuit comprising:
- an electroluminescence module adapted to emit light in response to a driving current;
- a driving module having a work voltage input terminal wherein the driving module is connected to a first node and a second node, wherein the driving module is adapted to generate and output to the second node the driving current based on a difference between a difference between a voltage at the first node and a work voltage input via the work voltage input terminal and a threshold voltage of the driving module;
- a threshold voltage compensation and light emission control module having at least two control signal input terminals and an initialization voltage input terminal, wherein the threshold voltage compensation and light emission control module is connected to the first node, the second node and the electroluminescence module, wherein the threshold voltage compensation and light emission control module is adapted to compensate the voltage at the first node to a sum of the threshold voltage of the driving module and the work voltage in response to a combination of levels at the at least two control signal input terminals being a first level combination, wherein the threshold voltage compensation and light emission control module is adapted to initialize the first node by short-circuiting the first node to the initialization voltage input terminal in response to the combination of the levels at the at least two control signal input terminals being a second level combination, and wherein the threshold voltage compensation and light emission control module is adapted to direct the driving current output to the second node by the driving module to the electroluminescence module in response to the combination of the levels at the at least two control signal input terminals being a third level combination;
- a data voltage write module having a data voltage input terminal and a control signal input terminal, wherein the data voltage write module is connected to a third node, wherein the data voltage write module is adapted to write a data voltage to the third node under control of a level at the control signal input terminal;
- a reset module having a reset voltage input terminal and a control signal input terminal, wherein the reset module is connected to the third node, wherein the reset module is adapted to reset a voltage at the third node under control of a level at the control signal input terminal;
- and
- a capacitor module having a first terminal connected to the first node and a second terminal connected to the third node.
4 more elements
A method of driving a pixel circuit of,
- wherein the pixel circuit comprises
- an electroluminescence module adapted to emit light in response to a driving current;
- a driving module having a work voltage input terminal wherein the driving module is connected to a first node and a second node, wherein the driving module is adapted to generate and output to the second node the driving current based on a difference between a voltage at the first node and a work voltage input via the work voltage input terminal and a threshold voltage of the driving module;
- a threshold voltage compensation and light emission control module having at least two control signal input terminals and an initialization voltage input terminal, wherein the threshold voltage compensation and light emission control module is connected to the first node, the second node and the electroluminescence module, wherein the threshold voltage compensation and light emission control module is adapted to compensate the voltage at the first node to a sum of the threshold voltage of the driving module and the work voltage in response to a combination of levels at the at least two control signal input terminals being a first level combination, wherein the threshold voltage compensation and light emission control module is adapted to initialize the first node by short-circuiting the first node to the initialization voltage input terminal in response to the combination of the levels at the at least two control signal input terminals being a second level combination, and wherein the threshold voltage compensation and light emission control module is adapted to direct the driving current output to the second node by the driving module to the electroluminescence module in response to the combination of the levels at the at least two control signal input terminals being a third level combination;
- a data voltage write module having a data voltage input terminal and a control signal input terminal, wherein the data voltage write module is connected to a third node, wherein the data voltage write module is adapted to write a data voltage to the third node under control of a level at the control signal input terminal;
- a reset module having a reset voltage input terminal and a control signal input terminal, wherein the reset module is connected to the third node, wherein the reset module is adapted to reset a voltage at the third node under control of a level at the control signal input terminal;
- and
- a capacitor module having a first terminal connected to the first node and a second terminal connected to the third node;
- the method comprising:
- initializing, at an initialization phase, the voltage at the first node by applying level signals of the second level combination to the control signal input terminals of the threshold voltage compensation and light emission control module;
- resetting, at a reset phase, the voltage at the third node by applying a control signal to the control signal input terminal of the reset module;
- compensating, at a threshold voltage compensation phase, the voltage at the first node to the sum of the threshold voltage of the driving module and the work voltage by applying level signals of the first level combination to the control signal input terminals of the threshold voltage compensation and light emission control module;
- applying, at a data voltage write phase, a control signal to the control signal input terminal of the data voltage write module, and a data voltage to the data voltage input terminal;
- and
- directing, at a light emission phase, the driving current output to the second node by the driving module to the electroluminescence module by applying level signals of the third level combination to the control signal input terminals of the threshold voltage compensation and light emission control module.
12 more elements
Dependencies are inferred from the claim text.