CN109215580B - Pixel circuit structure and driving method thereof - Google Patents

Pixel circuit structure and driving method thereof Download PDF

Info

Publication number
CN109215580B
CN109215580B CN201811090324.3A CN201811090324A CN109215580B CN 109215580 B CN109215580 B CN 109215580B CN 201811090324 A CN201811090324 A CN 201811090324A CN 109215580 B CN109215580 B CN 109215580B
Authority
CN
China
Prior art keywords
oled
switch
energy storage
driving transistor
pixel circuit
Prior art date
Application number
CN201811090324.3A
Other languages
Chinese (zh)
Other versions
CN109215580A (en
Inventor
张衎
沈志华
Original Assignee
昆山国显光电有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 昆山国显光电有限公司 filed Critical 昆山国显光电有限公司
Priority to CN201811090324.3A priority Critical patent/CN109215580B/en
Publication of CN109215580A publication Critical patent/CN109215580A/en
Application granted granted Critical
Publication of CN109215580B publication Critical patent/CN109215580B/en

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element

Abstract

The invention relates to the technical field of display, and discloses a pixel circuit structure and a driving method thereof. The energy storage element is connected in parallel with two ends of the OLED device; the power supply unit is connected with the energy storage element; the collecting unit is connected with one end, close to the driving transistor, of the OLED device and used for collecting the lighting voltage of the OLED device; the data processing unit is connected with the acquisition unit and one end of the OLED device far away from the driving transistor and is used for adjusting the potential of the end of the OLED device far away from the driving transistor. The potential of one end, far away from the driving transistor, of the OLED device is adjusted to adapt to the OLED lighting voltage which changes constantly, and the normal work of the OLED device is guaranteed. Meanwhile, the potential value of one end of the OLED device close to the driving transistor is kept unchanged, and the luminous brightness of the OLED device is prevented from being attenuated.

Description

Pixel circuit structure and driving method thereof

Technical Field

The invention relates to the technical field of display, in particular to a pixel circuit structure and a driving method thereof.

Background

OLED (Organic Light Emitting Display) has gradually become a mainstream technology in the Display technology field due to its advantages of self-luminescence, wide viewing angle, high contrast ratio, and the like. The OLED display device may be classified into two broad categories, i.e., a Passive Matrix OLED (PMOLED) and an Active Matrix OLED (AMOLED), according to a driving manner. The AMOLED is a current-driven device, and when a current flows through the OLED device, the OLED device emits light, and the light emission brightness is determined by the current flowing through the device itself.

However, the present inventors have found that as the lifetime of an OLED device increases, the current flowing through the OLED device gradually decreases, resulting in a decrease in the emission luminance thereof.

Disclosure of Invention

In view of this, embodiments of the present invention provide a pixel circuit structure and a driving method thereof to solve the problem that as the usage time is prolonged, the current flowing through the OLED device decreases, and the luminance of the OLED device is attenuated.

According to a first aspect, an embodiment of the present invention provides a pixel circuit structure, including:

a driving transistor and an OLED device connected in series with each other;

the energy storage element is connected in parallel to two ends of the OLED device;

the power supply unit is connected with the energy storage element and is used for charging the energy storage element;

the collecting unit is connected with one end, close to the driving transistor, of the OLED device and used for collecting the turn-on voltage of the OLED device;

and the data processing unit is connected with the acquisition unit and one end of the OLED device far away from the driving transistor and is used for adjusting the potential of the OLED device far away from one end of the driving transistor according to the acquired lighting voltage of the OLED device.

Optionally, one end of the OLED device close to the driving transistor is connected to a gating switch, the gating switch is connected to the power supply unit through a first switch, and the gating switch is connected to the acquisition unit through a second switch.

Optionally, the acquisition unit comprises an integral operation circuit.

Optionally, an inverting input terminal of the integral operation circuit is connected to the second switch, and an output terminal of the integral operation circuit is connected to the data processing unit.

Optionally, a third switch is connected in parallel to two ends of the integrating capacitor in the integrating operation circuit.

Optionally, the first switch and the third switch are switching transistors, and a gate signal line of the third switch is connected to a gate signal line of the first switch.

According to a second aspect, an embodiment of the present invention provides a driving method of a pixel circuit, including the steps of:

charging energy storage elements connected in parallel to two ends of the OLED device through a power supply unit;

supplying power to the OLED device through the energy storage element until the OLED device is lightened;

collecting the current lighting voltage of the OLED device through a collecting unit;

acquiring a target potential value of one end, far away from the driving transistor, of the OLED device based on a difference value between the acquired current lighting voltage and a pre-stored initial lighting voltage;

and adjusting the potential of one end of the OLED device, which is far away from the driving transistor, according to the target potential value.

Optionally, before the step of charging the energy storage element connected in parallel across the OLED device by the power supply unit, the method further includes:

and closing a gating switch and a first switch between the power supply unit and the OLED device, and opening a second switch between the gating switch and the acquisition unit.

Optionally, before the step of charging the OLED device through the energy storage element until the OLED device is lit, the method further includes:

opening the gating switch, the first switch, and the second switch.

Optionally, before the step of acquiring the current lighting voltage of the OLED device by the acquisition unit, the method further includes:

closing the gating switch and the second switch, and opening the first switch.

The technical scheme of the invention has the following advantages:

according to the pixel circuit structure provided by the embodiment of the invention, the two ends of the OLED device are connected with the energy storage elements in parallel, the energy storage elements are connected with the power supply unit, and the power supply unit charges the energy storage elements; one end of the OLED device, which is close to the driving transistor, is also connected with a collecting unit, and the collecting unit is used for collecting the turn-on voltage of the OLED device. The data processing unit is connected with the acquisition unit and one end, far away from the driving transistor, of the OLED device and is used for adjusting the potential of the end, far away from the driving transistor, of the OLED device according to the acquired lighting voltage of the OLED device.

The pixel circuit structure works in the non-light-emitting time of the OLED device, and firstly supplies power to the energy storage unit through the power supply unitAnd then the energy storage unit charges the OLED device until the OLED device reaches the turn-on voltage value, the acquisition unit acquires the turn-on voltage of the OLED device, and finally the data processing unit adjusts the potential of one end of the OLED device, which is far away from the driving transistor, according to the acquired turn-on voltage of the OLED device. Namely, the potential of one end of the OLED device, which is far away from the driving transistor, is adjusted to adapt to the OLED lighting voltage which changes continuously, so that the normal work of the OLED device is ensured. Meanwhile, the potential value of the OLED device close to one end of the driving transistor is ensured to be kept unchanged, namely the source-drain voltage V of the driving transistor connected with the OLED device in seriesDSIs held constant, thereby making the gate voltage constant, IDSThe current drop in the prior art is compensated, and the luminous brightness of the OLED device is prevented from being attenuated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 shows a conventional AMOLED pixel circuit structure.

Fig. 2 shows a pixel circuit structure provided by an embodiment of the invention.

Fig. 3 shows a flowchart of a driving method provided by an embodiment of the present invention.

Description of the drawings:

1-a drive transistor; 2-an OLED device; 3-an energy storage element; 4-a power supply unit; 5-a collecting unit; 6-a data processing unit; 61-an analog-to-digital signal conversion unit; 62-an analytical processing unit; 63-a digital-to-analog signal conversion unit; 7-a gating switch; 8-a first switch; 9-a second switch; 10-third switch.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. It should also be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Fig. 1 shows a commonly used AMOLED pixel circuit structure, which includes an OLED device and a driving transistor connected in series, the driving transistor being used for driving the OLED device to emit light. The inventor analyzes and finds that the reason that the luminous brightness of the OLED device is attenuated along with the prolonging of the service time is as follows: the working voltage of the OLED device can rise along with the prolonging of the service time, and the voltage difference V between the two ends of the OLED device is generated due to the serial connection of the driving transistor and the OLED deviceOLEDVoltage difference V between source and drain of drive transistorDSThe sum being a constant value, thus VDSThe value of (b) is decreased, i.e., the potential of the drain of the driving transistor is increased. After the drain potential rises, the drain potential is coupled to the grid electrode of the driving transistor through parasitic capacitance, so that the grid electrode potential rises, and I flowing through the OLED deviceDSDecrease, ultimately leading to the emission of light of the OLED deviceThe attenuation affects the display effect.

Based on the above findings, the embodiment of the present invention provides a pixel circuit structure, as shown in fig. 2, including a driving transistor 1 and an OLED device 2 connected in series with each other, an energy storage element 3, a power supply unit 4, an acquisition unit 5, and a data processing unit 6. The energy storage element 3 is connected with two ends of the OLED device 2 in parallel; the power supply unit 4 is connected with the energy storage element 3 and is used for charging the energy storage element 3; the acquisition unit 5 is connected with one end of the OLED device 2 close to the driving transistor 1 and is used for acquiring the turn-on voltage of the OLED device 2; the data processing unit 6 is connected with the acquisition unit 5 and one end of the OLED device 2 far away from the driving transistor 1, and is used for adjusting the potential of the OLED device 2 far away from the driving transistor 1 according to the acquired lighting voltage of the OLED device 2.

Specifically, the source of the driving transistor 1 is connected to VDD, the drain is connected to the anode of the OLED device 2, and the gate is connected to the external data line. The cathode of the OLED device 2 is connected to VSS, one end of the energy storage element 3 is connected to the anode of the OLED device 2, and the other end is connected to the cathode of the OLED device 2, in this embodiment, the energy storage element 3 is preferably a capacitor. The power supply unit 4 is connected to one end of the energy storage element 3 close to the anode of the OLED device 2, in this embodiment, the power supply unit 4 may provide a voltage of 9V to 10V for the energy storage element 3. The input end of the acquisition unit 5 is connected with the anode of the OLED device 2, and the output end is connected with the input end of the data processing unit 6. The output terminal of the data processing unit 6 is connected to the VSS terminal.

The working principle of the pixel circuit structure provided by the embodiment of the invention is described as follows:

it should be noted that the pixel circuit structure operates in the non-light-emitting time of the OLED device 2, i.e. the OLED device 2 is disconnected from the driving transistor 1 (the driving transistor 1 is not shown in fig. 2 because of the off state, and the normal connection state can refer to fig. 1). Firstly, the energy storage unit is charged through the power supply unit 4, and then the OLED device 2 is charged through the energy storage unit, so as to reach the lighting voltage value of the OLED device 2 (i.e. lighting the OLED device 2), it should be noted here that the lighting voltage value of the OLED device 2 rises along with the increase of the service time, and therefore the charging time of the energy storage unit to the OLED device 2 is generally different each time. When the starting voltage value of the OLED device 2 is reached, the starting voltage value of the OLED device 2 is acquired through the acquisition unit 5, and finally the potential (namely the potential at the VSS end) of one end, far away from the driving transistor 1, of the OLED device 2 is adjusted through the data processing unit 6 according to the acquired starting voltage of the OLED device 2.

Namely, the potential of the end, far away from the driving transistor 1, of the OLED device 2 is adjusted to adapt to the OLED lighting voltage which changes constantly, and the normal work of the OLED device 2 is ensured. While ensuring that the potential value (i.e. anode potential/drain potential) of the OLED device 2 near the end of the driving transistor 1 remains unchanged, i.e. the source-drain voltage V of the driving transistor 1 in series with the OLED device 2DSIs held constant, thereby making the gate voltage constant, IDSThe current drop in the prior art is compensated for, and the light emitting brightness of the OLED device 2 is prevented from being attenuated.

As an alternative embodiment, in the present embodiment, one end of the OLED device 2 close to the driving transistor 1 is connected to a gate switch 7, the gate switch 7 is connected to the power supply unit 4 through a first switch 8, and the gate switch 7 is connected to the acquisition unit 5 through a second switch 9. Here, the first switch 8 and the second switch 9 may be directly connected for the purpose of simplifying the circuit configuration.

Since the same pixel unit includes a plurality of different color-emitting OLED devices 2, such as a red OLED device, a green OLED device, and a blue OLED device, the luminance decay rates of the different color-emitting OLED devices 2 are different, that is, the change amplitudes of the operating voltages of the different color-emitting OLED devices 2 are different. In this embodiment, the gating switch 7 is additionally arranged in the pixel circuit structure where each OLED device 2 is located, so that the OLED devices 2 with different light emitting colors can be controlled independently.

Meanwhile, VSS corresponding to the OLED devices 2 with different light emitting colors is also provided separately for separate control.

In this embodiment, the first switch 8 is provided to control connection or disconnection between the power supply unit 4 and other units during operation of the pixel circuit, and the second switch 9 is provided to control connection or disconnection between the pickup unit 5 and other units during operation of the pixel circuit.

In practical application, the gating switch 7 and the first switch 8 are closed, and when the second switch 9 is disconnected, the power supply unit 4 supplies power to the energy storage unit; when the gating switch 7, the first switch 8 and the second switch 9 are all switched off, the energy storage unit charges the OLED device 2; when the gating switch 7 and the second switch 9 are closed and the first switch 8 is opened, the collecting unit 5 collects the turn-on voltage value of the OLED device 2. That is, the arrangement of the first switch 8 and the second switch 9 ensures orderly normal operation of the pixel circuit.

In this embodiment, the gate switch 7, the first switch 8 and the second switch 9 are preferably switching transistors, and PMOS transistors are generally used. Therefore, the sensitivity of the gate switch 7, the first switch 8 and the second switch 9 can be satisfied, and the performance of the pixel circuit can be improved.

As an optional implementation manner, in this embodiment, the acquisition unit 5 includes an integral operation circuit, wherein an inverting input terminal of the integral operation circuit is connected to the second switch 9, a non-inverting input terminal of the integral operation circuit is grounded through a resistor, and an output terminal of the integral operation circuit is connected to the data processing unit 6. In practical application, the required result can be obtained according to the input voltage value and the integral operation, the operation is simple and convenient, and the circuit structure is simple and convenient to implement.

As an optional implementation manner, in the present embodiment, the integrating operational circuit has a third switch 10 connected in parallel to two ends of an integrating capacitor connected to the integrated operational amplifier. When the third switch 10 is closed, the integral operation circuit can be cleared. The third switch 10 is preferably a switching transistor, and is typically a PMOS transistor.

As an alternative, in this embodiment, the gate signal line of the third switch 10 is connected to the gate signal line of the first switch 8. I.e. the first switch 8 and the third switch 10 are controlled by the same signal. Assuming that the first switch 8 and the third switch 10 are both PMOS transistors, when a low level signal is applied to the gate signal lines of both, both the first switch 8 and the third switch 10 are turned on. At this time, the power supply unit 4 supplies power to the energy storage unit, and meanwhile, the integral operation circuit is cleared, namely, the last operation data is cleared, so that the integral operation is convenient to perform. The design enhances the function of the pixel circuit on one hand and also ensures the simplification of the circuit structure on the other hand.

As an alternative implementation, in the present embodiment, the data processing unit 6 includes an analog-to-digital signal conversion unit 61, an analysis processing unit 62, and a digital-to-analog signal conversion unit 63.

The input end of the analog-to-digital signal conversion unit 61 is connected with the output end of the acquisition unit 5, and is used for converting the acquired analog signal of the lighting voltage of the OLED device 2 into a digital signal. In the present embodiment, the Analog-to-Digital signal conversion unit 61 generally employs an Analog-to-Digital Converter (ADC).

The input end of the analysis processing unit 62 is connected to the output end of the analog-to-digital signal conversion unit 61, and is configured to analyze and process the digital signal output by the analog-to-digital signal conversion unit 61 to obtain a target potential value at the end of the OLED device 2 away from the driving transistor 1.

Note that, the analysis processing unit 62 stores an initial lighting voltage of the OLED device 2 in advance. When the analysis processing unit 62 receives the collected current lighting voltage, a difference between the current lighting voltage value and the initial lighting voltage value is calculated, and then a target potential value of the end of the OLED device 2 away from the driving transistor 1 is calculated based on the calculated difference of the lighting voltages. In practical application, assuming that the difference between the current lighting voltage value and the initial lighting voltage value is Δ V, the target potential value of the end of the OLED device 2 far from the driving transistor 1 should be increased by Δ V on the current basis to adapt to the variation of the OLED lighting voltage.

The digital-to-analog signal conversion unit 63 has an input end connected to the analysis processing unit 62 and an output end connected to an end of the OLED device 2 away from the driving transistor 1, and is configured to convert the digital signal of the target potential value output by the analysis processing unit 62 into an analog signal and apply the analog signal to an end of the OLED device 2 away from the driving transistor 1. The Digital-to-Analog signal conversion unit 63 generally employs a Digital-to-Analog Converter (DAC).

An embodiment of the present invention further provides a driving method of a pixel circuit, as shown in fig. 3, including the following steps:

step S11, charging the energy storage elements 3 connected in parallel at two ends of the OLED device 2 through the power supply unit 4;

step S12, charging the OLED device 2 through the energy storage element 3 until the OLED device 2 is lightened;

step S13, collecting the current lighting voltage of the OLED device 2 through the collecting unit 5;

step S14, obtaining a target potential value of one end of the OLED device 2 far away from the driving transistor 1 based on the difference value between the collected current lighting voltage and the pre-stored initial lighting voltage;

and step S15, adjusting the potential of one end of the OLED device 2 far away from the driving transistor 1 according to the target potential value.

In practical application, assuming that the difference between the current lighting voltage value and the initial lighting voltage value is Δ V, the target potential value of the end of the OLED device 2 far from the driving transistor 1 should be increased by Δ V on the current basis to adapt to the variation of the OLED lighting voltage.

The potential of one end, far away from the driving transistor 1, of the OLED device 2 is adjusted to adapt to the OLED lighting voltage which changes continuously, and the OLED device 2 is guaranteed to work normally. While ensuring that the potential value of the OLED device 2 close to one end of the driving transistor 1 remains unchanged, i.e. the source-drain voltage V of the driving transistor 1 connected in series with the OLED device 2DSIs held constant, thereby making the gate voltage constant, IDSThe current drop in the prior art is compensated for, and the light emitting brightness of the OLED device 2 is prevented from being attenuated.

As an optional implementation manner, in this embodiment, before step S11, the method further includes: the gate switch 7 and the first switch 8 between the power supply unit 4 and the OLED device 2 are closed and the second switch 9 between the gate switch 7 and the acquisition unit 5 is opened. Therefore, the power supply unit is disconnected from the acquisition unit, and only the energy storage element communicated with the power supply unit is charged by the power supply unit, so that the ordered work of the circuit is ensured.

As an optional implementation manner, in this embodiment, before step S12, the method further includes: the gate switch 7, the first switch 8 and the second switch 9 are opened. Therefore, the energy storage element and the power supply unit and the energy storage element and the acquisition unit are in an off state, electric energy released by the energy storage element is only transmitted to the OLED device, the charging efficiency is improved, and the acquisition unit and the power supply unit are prevented from being interfered.

As an optional implementation manner, in this embodiment, before step S13, the method further includes: the gate switch 7 and the second switch 9 are closed and the first switch 8 is opened. Therefore, the power supply unit and the acquisition unit and the power supply unit and the OLED device are in a disconnected state, the lighting voltage of the OLED device received by the input end of the acquisition unit is ensured, and the interference of other electric signals to the input end signal of the acquisition unit is avoided.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A pixel circuit structure, comprising:
a drive transistor (1) and an OLED device (2) connected in series with each other;
the energy storage element (3) is connected in parallel to two ends of the OLED device (2);
the power supply unit (4) is connected with the energy storage element (3) and is used for charging the energy storage element (3);
the collecting unit (5) is connected with one end, close to the driving transistor (1), of the OLED device (2) and used for collecting the lighting voltage of the OLED device (2);
the data processing unit (6) is connected with the acquisition unit (5) and one end, far away from the driving transistor (1), of the OLED device (2) and used for adjusting the potential of one end, far away from the driving transistor (1), of the OLED device (2) according to the acquired lighting voltage of the OLED device (2).
2. The pixel circuit structure according to claim 1, wherein a gating switch (7) is connected to one end of the OLED device (2) close to the driving transistor (1), the gating switch (7) is connected to the power supply unit (4) through a first switch (8), and the gating switch (7) is connected to the acquisition unit (5) through a second switch (9).
3. A pixel circuit arrangement according to claim 2, wherein the acquisition unit (5) comprises an integrating arithmetic circuit.
4. A pixel circuit arrangement according to claim 3, wherein an inverting input of the integrating arithmetic circuit is connected to the second switch (9) and an output of the integrating arithmetic circuit is connected to the data processing unit (6).
5. A pixel circuit arrangement according to claim 3, wherein a third switch (10) is connected in parallel to both ends of the integrating capacitor in the integrating operational circuit.
6. The pixel circuit structure according to claim 5, wherein the first switch (8) and the third switch (10) are switching transistors, and a gate signal line of the third switch (10) is connected to a gate signal line of the first switch (8).
7. A driving method of a pixel circuit, comprising the steps of:
charging the OLED device (2) and energy storage elements (3) connected in parallel to two ends of the OLED device (2) through a power supply unit (4) until the OLED device (2) is lightened;
when the power supply unit (4) does not charge the energy storage element (3), the voltage at two ends of the OLED device (2) is maintained through the energy storage element (3), and the lighting state of the OLED device (2) is maintained;
collecting the current lighting voltage of the OLED device (2) through a collecting unit (5);
obtaining a target potential value of one end, far away from the driving transistor (1), of the OLED device (2) based on a difference value between the collected current lighting voltage and a pre-stored initial lighting voltage;
and adjusting the potential of one end of the OLED device (2) far away from the driving transistor (1) according to the target potential value.
8. The driving method of the pixel circuit according to claim 7, further comprising, before the step of charging the OLED device (2) and the energy storage element (3) connected in parallel to the two ends of the OLED device (2) by the power supply unit (4) until the OLED device (2) is lighted:
closing a gating switch (7) and a first switch (8) between the power supply unit (4) and the OLED device (2), and opening a second switch (9) between the gating switch (7) and the acquisition unit (5).
9. The method of driving a pixel circuit according to claim 8, further comprising, before the step of maintaining the lighting state of the OLED device (2) by maintaining the voltage across the OLED device (2) through the energy storage element (3) when the energy storage element (3) is not charged by the power supply unit (4):
-opening the gate switch (7), the first switch (8) and the second switch (9).
10. The driving method of the pixel circuit according to claim 8 or 9, further comprising, before the step of acquiring the current turn-on voltage of the OLED device (2) by the acquisition unit (5):
-closing the gate switch (7) and the second switch (9), and-opening the first switch (8).
CN201811090324.3A 2018-09-18 2018-09-18 Pixel circuit structure and driving method thereof CN109215580B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811090324.3A CN109215580B (en) 2018-09-18 2018-09-18 Pixel circuit structure and driving method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811090324.3A CN109215580B (en) 2018-09-18 2018-09-18 Pixel circuit structure and driving method thereof

Publications (2)

Publication Number Publication Date
CN109215580A CN109215580A (en) 2019-01-15
CN109215580B true CN109215580B (en) 2020-05-05

Family

ID=64984058

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811090324.3A CN109215580B (en) 2018-09-18 2018-09-18 Pixel circuit structure and driving method thereof

Country Status (1)

Country Link
CN (1) CN109215580B (en)

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1532793A (en) * 2003-03-21 2004-09-29 友达光电股份有限公司 Active matrix organic light emitting diode circuit capable of automatically regulating cathode voltage and its automatic regulating method
CN1598919A (en) * 2003-09-16 2005-03-23 友达光电股份有限公司 Organic luminous display panel and its feedback control device
JP2008181005A (en) * 2007-01-25 2008-08-07 Sony Corp Luminance characteristic correction device, electroluminescence display device, electronic equipment, luminance characteristic correction method, and computer program
KR20130053657A (en) * 2011-11-15 2013-05-24 엘지디스플레이 주식회사 Organic light emitting diode display device
CN103280188A (en) * 2013-06-14 2013-09-04 电子科技大学 Aging compensation system and method of OLED device
WO2014208458A1 (en) * 2013-06-27 2014-12-31 シャープ株式会社 Display device and drive method therefor
CN105453164A (en) * 2013-07-23 2016-03-30 娜我比可隆股份有限公司 Brightness deviation compensation apparatus and compensation method of display device
CN105609029A (en) * 2016-03-24 2016-05-25 深圳市华星光电技术有限公司 System for sensing pixel driving characteristic of AMOLED (Active Matrix Organic Light Emitting Diode) and AMOLED display device
CN106297658A (en) * 2016-10-28 2017-01-04 昆山国显光电有限公司 A kind of current compensation device, method and organic LED display panel
CN106504707A (en) * 2016-10-14 2017-03-15 深圳市华星光电技术有限公司 OLED pixel mixed compensation circuit and mixed compensation method
CN106782320A (en) * 2016-12-29 2017-05-31 深圳市华星光电技术有限公司 OLED drives the threshold voltage method for detecting of thin film transistor (TFT)
KR20170072407A (en) * 2015-12-16 2017-06-27 엘지디스플레이 주식회사 Organic Light Emitting Display and Degradation Sensing Method of Organic Light Emitting Display
CN106935193A (en) * 2017-05-12 2017-07-07 京东方科技集团股份有限公司 OLED drives compensation circuit, OLED display panel and its driving method
CN106991965A (en) * 2017-05-08 2017-07-28 深圳市华星光电技术有限公司 A kind of compensation of ageing system and method for OLED

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0318613D0 (en) * 2003-08-08 2003-09-10 Koninkl Philips Electronics Nv Electroluminescent display devices
JP4935979B2 (en) * 2006-08-10 2012-05-23 カシオ計算機株式会社 Display device and driving method thereof, display driving device and driving method thereof
JP5487585B2 (en) * 2008-09-19 2014-05-07 セイコーエプソン株式会社 Electro-optical device, driving method thereof, and electronic apparatus
US8487844B2 (en) * 2010-09-08 2013-07-16 Semiconductor Energy Laboratory Co., Ltd. EL display device and electronic device including the same
CN105895020B (en) * 2016-06-02 2019-07-02 深圳市华星光电技术有限公司 OLED display drive system and OLED display driving method
TWI592917B (en) * 2016-07-07 2017-07-21 友達光電股份有限公司 Pixel sensing device and method for controlling the same

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1532793A (en) * 2003-03-21 2004-09-29 友达光电股份有限公司 Active matrix organic light emitting diode circuit capable of automatically regulating cathode voltage and its automatic regulating method
CN1598919A (en) * 2003-09-16 2005-03-23 友达光电股份有限公司 Organic luminous display panel and its feedback control device
JP2008181005A (en) * 2007-01-25 2008-08-07 Sony Corp Luminance characteristic correction device, electroluminescence display device, electronic equipment, luminance characteristic correction method, and computer program
KR20130053657A (en) * 2011-11-15 2013-05-24 엘지디스플레이 주식회사 Organic light emitting diode display device
CN103280188A (en) * 2013-06-14 2013-09-04 电子科技大学 Aging compensation system and method of OLED device
WO2014208458A1 (en) * 2013-06-27 2014-12-31 シャープ株式会社 Display device and drive method therefor
CN105453164A (en) * 2013-07-23 2016-03-30 娜我比可隆股份有限公司 Brightness deviation compensation apparatus and compensation method of display device
KR20170072407A (en) * 2015-12-16 2017-06-27 엘지디스플레이 주식회사 Organic Light Emitting Display and Degradation Sensing Method of Organic Light Emitting Display
CN105609029A (en) * 2016-03-24 2016-05-25 深圳市华星光电技术有限公司 System for sensing pixel driving characteristic of AMOLED (Active Matrix Organic Light Emitting Diode) and AMOLED display device
CN106504707A (en) * 2016-10-14 2017-03-15 深圳市华星光电技术有限公司 OLED pixel mixed compensation circuit and mixed compensation method
CN106297658A (en) * 2016-10-28 2017-01-04 昆山国显光电有限公司 A kind of current compensation device, method and organic LED display panel
CN106782320A (en) * 2016-12-29 2017-05-31 深圳市华星光电技术有限公司 OLED drives the threshold voltage method for detecting of thin film transistor (TFT)
CN106991965A (en) * 2017-05-08 2017-07-28 深圳市华星光电技术有限公司 A kind of compensation of ageing system and method for OLED
CN106935193A (en) * 2017-05-12 2017-07-07 京东方科技集团股份有限公司 OLED drives compensation circuit, OLED display panel and its driving method

Also Published As

Publication number Publication date
CN109215580A (en) 2019-01-15

Similar Documents

Publication Publication Date Title
US10475383B2 (en) Pixel circuit, display device, and method of driving pixel circuit
US9123289B2 (en) Organic light emitting diode display device with reference voltage lines and method of operation in an organic light emitting diode display device
US10147356B2 (en) OLED pixel driving circuit and OLED display device
TWI566220B (en) Organic light emitting display device and method for driving the same
JP6669651B2 (en) OLED AC drive circuit, drive method and display device
US9595228B2 (en) Pixel array and organic light emitting display device including the same
CN103688302B (en) The system and method using dynamic power control for display system
US10217412B2 (en) OLED display device drive system and OLED display drive method
CN104751799B (en) Image element circuit and driving method, display device
US9058772B2 (en) Display device and driving method thereof
US9721508B2 (en) Pixel circuit and driving method thereof, organic light-emitting display device
CN105321456B (en) The OLED of Organic Light Emitting Diode degeneration can be sensed
US8243055B2 (en) Light-emitting display device
US8125479B2 (en) Self light emitting type display device
JP4007336B2 (en) Pixel circuit driving method, pixel circuit, electro-optical device, and electronic apparatus
TW574529B (en) Organic electro-luminescence display device
KR102128082B1 (en) Organic light emitting display device and driving method thereof
KR20160001822A (en) Organic Light Emitting Display For Compensating Electrical Characteristics Deviation Of Driving Element
JP3765918B2 (en) Light emitting display and driving method thereof
TWI457902B (en) Organic light emitting display and driving method thereof
US7154454B2 (en) Spontaneous light emitting display device
JP3819723B2 (en) Display device and driving method thereof
CN101465097B (en) Self-luminous display device and driving method of the same
TWI674568B (en) Organic light emitting display
TWI471843B (en) Pixel circuit and image display device with organic light-emitting diode

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant