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US 2019/0096334 A1Published application
Oled pixel driving circuit and oled display device
AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.
InventorGuang LI
Life of this patent
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Abstract
An OLED pixel driving circuit and an OLED display device. The OLED pixel driving circuit includes a first switching element, second switching element, a third switching element, a fourth switching element, a fifth switching element, a first capacitor, a second capacitor and an OLED. The signals received by the OLED pixel driving circuit include a data signal formed by reference voltage and data voltage. When lighting the organic electroluminescent device (OLED), a current flowing through the second switching element is proportional to a square of a difference between the data voltage and a reference voltage in the data signal. Through the above method, the present invention can increase the display quality of the OLED.
Claims19
An OLED pixel driving circuit, comprising:
- a first switching element, a control terminal of the first switching element receives a first type of scanning signal (gn) of a present stage, a first channel terminal of the first switching element receives a data signal (Data), wherein, the data signal is a pulse signal formed by a reference voltage and a data voltage;
- a second switching element, a control terminal of the second switching element is connected with a second channel terminal of the first switching element through a first capacitor, a first channel terminal receives a power source voltage (VDD), wherein, a connection location between the second channel terminal of the first switching element and the first capacitor is defined as a first node, a connection location between the control terminal of the second switching element and the first capacitor is defined as a second node, and the power source voltage further connects to the second node through a second capacitor;
- a third switching element, a control terminal of the third switching element receives a lighting control signal (EM2), a first channel terminal of the third switching element is connected with a second channel terminal of the second switching element, a second channel terminal of the third switching element is connected to an organic electroluminescent device (OLED), wherein, a connection portion between the second channel terminal 23 of the second switching element and the first channel terminal of the third switching element is defined as a third node;
- a fourth switching element, a control terminal of the fourth switching element receives a second type of scanning signal of the present stage, a first channel terminal of the fourth switching element is connected to the third node, and a second channel terminal of the fourth switching element is connected to the second node;
- and
- a fifth switching element, a control terminal of the fifth switching node receives a second type of scanning signal of the previous stage, a first channel terminal of the fifth switching node is connected with the second node, a second channel terminal of the fifth switching element receives a discharging voltage when the fifth switching element M5 is turned on;
- wherein, the first switching element, the second switching element, the third switching element, the fourth switching element, and the fifth switching element are all PMOS transistors;
- each of the second type of scanning signal of the previous stage, the second type of scanning signal of the present stage, the first type of scanning signal of the present stage and the lighting control signal is a timing pulse signal;
- wherein, a pulse of the second type of scanning signal of the previous stage is earlier than the second type of scanning signal of the present stage, a starting moment of a pulse of the first type of the scanning signal of the present stage is the same as a starting moment of the pulse of the second type of the scanning signal of the previously stage, an end moment of the pulse of the first scanning signal of the present stage is later then an end moment of the pulse of the second type of scanning signal of the present stage;
- an starting moment of a pulse corresponding to the data voltage in the data signal is not earlier than an end moment of the pulse of the second type of scanning signal, and is earlier an end moment of the pulse of the first type of scanning signal of the present stage;
- an end moment of the pulse corresponding to the data voltage in the data signal is later than the end moment of the pulse of the first type of scanning signal of the present stage;
- a starting moment of the pulse of the lighting control signal is not later than the start moment of the second type of the scanning signal of the previous stage, and an end moment of the pulse of the lighting control signal is not earlier than the end moment of the pulse corresponding to the data voltage in the data signal;
- and
- wherein, when lighting the organic electroluminescent device (OLED), a current flowing through the second switching element is proportional to a square of a difference between the data voltage and a reference voltage in the data signal.
11 more elements
An OLED pixel driving circuit, comprising:
- a first switching element, a control terminal of the first switching element receives a first type of scanning signal (gn) of a present stage, a first channel terminal of the first switching element receives a data signal (Data), wherein, the data signal is a pulse signal formed by a reference voltage and a data voltage;
- a second switching element, a control terminal of the second switching element is connected with a second channel terminal of the first switching element through a first capacitor, a first channel terminal receives a power source voltage (VDD), wherein, a connection location between the second channel terminal of the first switching element and the first capacitor is defined as a first node, a connection location between the control terminal of the second switching element and the first capacitor is defined as a second node, and the power source voltage further connects to the second node through a second capacitor;
- a third switching element, a control terminal of the third switching element receives a lighting control signal (EM2), a first channel terminal of the third switching element is connected with a second channel terminal of the second switching element, a second channel terminal of the third switching element is connected to an organic electroluminescent device (OLED), wherein, a connection portion between the second channel terminal 23 of the second switching element and the first channel terminal of the third switching element is defined as a third node;
- a fourth switching element, a control terminal of the fourth switching element receives a second type of scanning signal of the present stage, a first channel terminal of the fourth switching element is connected to the third node, and a second channel terminal of the fourth switching element is connected to the second node;
- and
- a fifth switching element, a control terminal of the fifth switching node receives a second type of scanning signal of the previous stage, a first channel terminal of the fifth switching node is connected with the second node, a second channel terminal of the fifth switching element receives a discharging voltage when the fifth switching element M5 is turned on;
- wherein, when lighting the organic electroluminescent device (OLED), a current flowing through the second switching element is proportional to a square of a difference between the data voltage and a reference voltage in the data signal.
4 more elements
An OLED display device including multiple OLED pixel unit arranged as a matrix, wherein, each OLED pixel unit includes a corresponding OLED pixel driving circuit, and the OLED pixel driving circuit comprises:
- a first switching element, a control terminal of the first switching element receives a first type of scanning signal (gn) of a present stage, a first channel terminal of the first switching element receives a data signal (Data), wherein, the data signal is a pulse signal formed by a reference voltage and a data voltage;
- a second switching element, a control terminal of the second switching element is connected with a second channel terminal of the first switching element through a first capacitor, a first channel terminal receives a power source voltage (VDD), wherein, a connection location between the second channel terminal of the first switching element and the first capacitor is defined as a first node, a connection location between the control terminal of the second switching element and the first capacitor is defined as a second node, and the power source voltage further connects to the second node through a second capacitor;
- a third switching element, a control terminal of the third switching element receives a lighting control signal (EM2), a first channel terminal of the third switching element is connected with a second channel terminal of the second switching element, a second channel terminal of the third switching element is connected to an organic electroluminescent device (OLED), wherein, a connection portion between the second channel terminal 23 of the second switching element and the first channel terminal of the third switching element is defined as a third node;
- a fourth switching element, a control terminal of the fourth switching element receives a second type of scanning signal of the present stage, a first channel terminal of the fourth switching element is connected to the third node, and a second channel terminal of the fourth switching element is connected to the second node;
- and
- a fifth switching element, a control terminal of the fifth switching node receives a second type of scanning signal of the previous stage, a first channel terminal of the fifth switching node is connected with the second node, a second channel terminal of the fifth switching element receives a discharging voltage when the fifth switching element M5 is turned on;
- wherein, when lighting the organic electroluminescent device (OLED), a current flowing through the second switching element is proportional to a square of a difference between the data voltage and a reference voltage in the data signal.
4 more elements
Dependencies are inferred from the claim text.