CN109935205B - Pixel driving circuit and compensation method of pixel driving circuit - Google Patents
Pixel driving circuit and compensation method of pixel driving circuit Download PDFInfo
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- CN109935205B CN109935205B CN201910260987.3A CN201910260987A CN109935205B CN 109935205 B CN109935205 B CN 109935205B CN 201910260987 A CN201910260987 A CN 201910260987A CN 109935205 B CN109935205 B CN 109935205B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/22—Control 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
- G09G3/30—Control 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
- G09G3/32—Control 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]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/22—Control 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
- G09G3/30—Control 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
- G09G3/32—Control 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]
- G09G3/3208—Control 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]
- G09G3/3225—Control 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
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Abstract
According to the pixel driving circuit and the compensation method of the pixel driving circuit, the pixel driving circuit with the 3T1C structure is adopted, actual current of the driving transistor in each pixel is detected, threshold voltage of the driving transistor in each pixel is determined according to the actual current, and then effective compensation is carried out on the driving transistor in each pixel, so that the purpose of improving light emitting uniformity of the light emitting device is achieved, and image quality is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a pixel driving circuit and a compensation method of the pixel driving circuit.
Background
In the prior art, the transistors in the pixel driving circuit mostly adopt low-temperature polysilicon thin film transistors or oxide thin film transistors. Compared with a common amorphous silicon thin film transistor, the low-temperature polysilicon thin film transistor and the oxide thin film transistor have higher mobility and more stable characteristics, and are more suitable for being applied to Active-matrix organic light-emitting diode (AMOLED) display.
However, due to the limitations of the crystallization process, the low temperature polysilicon thin film transistor fabricated on the large area glass substrate often has non-uniformity in electrical parameters such as threshold voltage, mobility, etc. This non-uniformity is converted into a driving current difference and a luminance difference of an Organic Light Emitting Diode (OLED) device, and is perceived by human eyes, i.e., a color non-uniformity phenomenon. Although the oxide thin film transistor has good process uniformity, the threshold voltage of the oxide thin film transistor can drift similarly to that of an amorphous silicon thin film transistor under long-time pressurization and high temperature, so that different display pictures are caused, and display brightness difference can be caused due to different threshold drift amounts of the thin film transistors of all parts of the panel. This difference is related to the previously displayed image and therefore often appears as an afterimage.
Disclosure of Invention
The embodiment of the application provides a pixel driving circuit and a display panel, which can compensate the threshold voltage change of a driving transistor, improve the light-emitting uniformity of a light-emitting device and further improve the image quality.
In a first aspect, the present application provides a pixel driving circuit, comprising: the device comprises a compensation module, a light emitting module and a detection module; the compensation module and the detection module are both connected with the light-emitting module, and the compensation module is connected with the detection module;
the compensation module is connected with a current-level scanning signal and a data signal and is used for transmitting the data signal to the light-emitting module under the control of the current-level scanning signal;
the detection module is connected with a control signal and is used for detecting the actual current of the light-emitting module and comparing the actual current with a preset current so as to generate a compensation voltage of the light-emitting module;
the compensation module is further configured to compensate the data signal according to the compensation voltage under the control of the current-stage scanning signal.
In the pixel driving circuit provided by the application, the compensation module comprises a storage capacitor and a first transistor;
the first end of the storage capacitor is electrically connected to the first node, and the second end of the storage capacitor is electrically connected to the previous-stage scanning signal;
the gate of the first transistor is electrically connected to the current-stage scanning signal, the source of the first transistor is electrically connected to the data signal, and the drain of the first transistor is electrically connected to the first node.
The storage capacitor comprises a first polar plate and a second polar plate which are oppositely arranged, the first polar plate is electrically connected with the first node, the second polar plate is a scanning line, and the scanning line is used for inputting the previous scanning signal.
In the pixel driving circuit provided by the present application, the light emitting module includes a second transistor and a light emitting device;
the grid electrode of the second transistor is electrically connected to the first node, the source electrode of the second transistor is electrically connected to a power signal, and the drain electrode of the second transistor is electrically connected to a second node;
the cathode end of the light-emitting device is electrically connected to the second node, and the anode end of the light-emitting device is electrically connected to the ground end.
In the pixel driving circuit provided by the application, the detection module comprises a third transistor;
the gate of the third transistor is electrically connected to the control signal, the drain of the third transistor is electrically connected to the current detection module, the current detection module is configured to detect an actual current of the light emitting module and compare the actual current with a preset current to generate a compensation voltage of the light emitting module, and the source of the third transistor is electrically connected to the second node.
In the pixel driving circuit provided by the present application, the compensation module generates a compensation voltage of the second transistor according to an actual current flowing through the second transistor, generates a compensation signal according to the compensation voltage of the second transistor, and transmits the compensation signal to the first transistor.
In the pixel driving circuit provided by the present application, the driving timing of the pixel driving circuit includes:
an initialization stage, in which the current-stage scanning signal is at a low potential, the control signal is at a low potential, the previous-stage scanning signal is at a high potential, the second transistor is turned on, and the power signal is transmitted to the light emitting device through the second transistor;
a threshold voltage detection stage, in which the current-stage scanning signal is at a low potential, the control signal is at a high potential, the previous-stage signal is at a high potential, the second transistor is turned on, the third transistor is turned on, the power signal is transmitted to the light emitting device through the second transistor, the detection module detects an actual current output by a drain of the second transistor, and calculates a difference between the actual current and a preset current to calculate a compensation voltage of the second transistor;
and a threshold voltage compensation stage, in which the current-stage scanning signal is at a high potential, the control signal is at a high potential, the previous-stage scanning signal is at a low potential, the first transistor is turned on, the second transistor is turned on, the data signal is transmitted to a gate of the second transistor through the first transistor, the compensation module compensates the data signal according to the compensation voltage, and the power signal is transmitted to the light emitting device through the second transistor.
In the pixel driving circuit provided by the present application, the first transistor, the second transistor, and the third transistor are all N-type transistors.
In the pixel driving circuit provided by the application, the control signal is provided by an external timer.
In a second aspect, the present application provides a compensation method for a pixel driving circuit, including:
detecting an actual current of a second transistor of the pixel driving circuit;
calculating a difference value between the actual current and a preset current, and generating a compensation signal according to the difference value;
and compensating the pixel driving circuit based on the compensation signal.
According to the pixel driving circuit and the compensation method of the pixel driving circuit, the pixel driving circuit with the 3T1C structure is adopted, actual current of the driving transistor in each pixel is detected, threshold voltage of the driving transistor in each pixel is determined according to the actual current, and then effective compensation is carried out on the driving transistor in each pixel, so that the purpose of improving light emitting uniformity of the light emitting device is achieved, and image quality is improved.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be 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 only some embodiments of the application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 3 is a timing diagram of driving signals of a pixel driving circuit provided in the present application;
fig. 4 is a schematic flowchart of a compensation method of a pixel driving circuit according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. 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 application.
The transistors used in all embodiments of the present application may be thin film transistors or field effect transistors or other devices with the same characteristics, and since the source and drain of the transistors used herein are symmetrical, the source and drain may be interchanged. In the embodiment of the present application, to distinguish two poles of a transistor except for a gate, one of the two poles is referred to as a source, and the other pole is referred to as a drain. The form in the drawing provides that the middle end of the switching transistor is a grid, the signal input end is a source, and the output end is a drain. In addition, the transistors used in the embodiments of the present application may include a P-type transistor and/or an N-type transistor, where the P-type transistor is turned on when the gate is at a low level and turned off when the gate is at a high level, and the N-type transistor is turned on when the gate is at a high level and turned off when the gate is at a low level.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure. As shown in fig. 1, a pixel driving circuit provided in an embodiment of the present application includes: a compensation module 101, a light emitting module 102 and a detection module 103. The compensation module 101 and the detection module 103 are both connected to the light emitting module 102, and the compensation module 101 is connected to the detection module 103.
The compensation module 101 is connected to the scanning signal and the Data signal Data, and the compensation module 101 is configured to transmit the Data signal Data to the light emitting module 102 under the control of the scanning signal. The detection module 103 is connected to the control signal RD, and the detection module 103 is configured to detect an actual current Ir of the light emitting module 102 and compare the actual current Ir with a preset current I to generate a compensation voltage V of the light emitting module 102. In addition, the compensation module 101 is further configured to compensate the Data signal Data according to the compensation voltage V under the control of the present stage scanning signal.
Specifically, referring to fig. 2, fig. 2 is a circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure.
The compensation module 101 includes a storage capacitor C1 and a first transistor T1. The first terminal of the storage capacitor C1 is electrically connected to the first node a, and the second terminal of the storage capacitor is electrically connected to the previous-stage scan signal. The gate of the first transistor T1 is electrically connected to the present-level scan signal, the source of the first transistor T1 is electrically connected to the Data signal Data, and the drain of the first transistor T1 is electrically connected to the first node a.
The light emitting module 102 includes a second transistor T2 and a light emitting device D. The gate of the second transistor T2 is electrically connected to the first node a, the source of the second transistor T2 is electrically connected to the power signal ELVDD, and the drain of the second transistor T2 is electrically connected to the second node b. The cathode terminal of the light emitting device D is electrically connected to the second node b, and the anode terminal of the light emitting device D is electrically connected to the ground terminal.
The detection module 103 includes a third transistor T3. The third transistor T3 is electrically connected to the control signal RD, the drain of the third transistor T3 is electrically connected to the current detecting module 103a, and the source of the third transistor is electrically connected to the second node b. It should be noted that the current detection module 103a is configured to detect an actual current Ir of the light emitting module 102, and compare the actual current Ir with a preset current I to generate a compensation voltage V of the light emitting module 102.
In some embodiments, the first transistor T1, the second transistor T2, and the third transistor T3 are all N-type transistors. The transistors in the pixel driving circuit provided by the embodiment of the application are the same type of transistors, so that the influence of difference among different types of transistors on the pixel driving circuit is avoided.
In some embodiments, the control signal RD is provided by an external timer.
In some embodiments, the storage capacitor C1 includes a first plate and a second plate disposed opposite to each other, the first plate is electrically connected to the first node a, the second plate is a scan line, and the scan line is used for inputting a previous scan signal. The scanning line is used as the second electrode plate of the storage capacitor C1, so that no additional scanning line is needed, the aperture ratio of the pixel driving circuit can be increased, and the light emitting area of the aperture is increased.
Referring to fig. 3, fig. 3 is a timing diagram of driving signals of a pixel driving circuit according to the present application. The driving timing of the pixel driving circuit includes: an initialization phase t1, a threshold voltage detection phase t2, and a threshold voltage compensation phase t 3.
In the initialization period T1, the scan signal of the current stage is at a low voltage level, the control signal RD is at a low voltage level, the scan signal of the previous stage is at a high voltage level, the second transistor T2 is turned on, and the power signal ELVDD is transmitted to the light emitting device D through the second transistor T2, where the voltage of the second transistor T2 is Vref.
In the threshold voltage detection stage T2, the scan signal of the current stage is at a low potential, the control signal RD is at a high potential, the scan signal of the previous stage is at a high potential, the second transistor T2 is turned on, the third transistor T3 is turned on, the power signal ELVDD is transmitted to the light emitting device D through the second transistor T2, the detection module 103 detects the actual current Ir output by the drain of the second transistor T2, and calculates a difference between the actual current Ir and the preset current I to calculate the compensation voltage V of the second transistor T2.
In the threshold voltage compensation stage T3, the scan signal of the current stage is at a high potential, the control signal RD is at a high potential, the scan signal of the previous stage is at a low potential, the first transistor T1 is turned on, the second transistor T2 is turned on, the Data signal Data is transmitted to the gate of the second transistor T2 through the first transistor T1, the compensation module 101 compensates the Data signal Data according to the compensation voltage V, and the power signal ELVDD is transmitted to the light emitting device D through the second transistor T2.
In some embodiments, the compensation module 101 generates the compensation voltage V of the second transistor according to the actual current Ir flowing through the second transistor T2, generates the compensation signal according to the threshold voltage V of the second transistor T2, and transmits the compensation signal to the first transistor T1.
Specifically, the compensation module 101 calculates a difference between the actual current Ir flowing through the second transistor T2 and the predetermined current I. For example, the preset current I is 2 ma, the actual current is 1.5 ma, i.e., the difference between the actual current Ir and the preset current I is 0.5 ma. Subsequently, the detection module 103 applies a compensation current Ib of 0.5 ma to the second transistor T2 under the driving of the control signal RD, so that the actual current Ir stabilizes at 2 ma. Then, the compensation module 101 generates the compensation voltage V of the second transistor T2 according to the compensation current Ib. Then, a compensation signal is generated according to the compensation voltage V of the second transistor T2 and is transmitted to the first transistor T1 to complete compensation of the pixel driving circuit.
Accordingly, referring to fig. 4, fig. 4 is a schematic flow chart illustrating a compensation method of a pixel driving circuit according to the present application. The present application further provides a compensation method of a pixel driving circuit, including:
110. the actual current of the second transistor of the pixel driving circuit is detected.
120. And calculating the difference value between the actual current and the preset current, and generating a compensation signal according to the difference value.
130. The pixel driving circuit is compensated based on the compensation signal.
Specifically, the actual current Ir of the second transistor T2 of the pixel drive circuit is first detected. Then, a difference between the actual current Ir flowing through the second transistor T2 and the preset current I Is calculated, and the compensation current Is provided to the second transistor T2 according to the difference between the actual current Ir and the preset current I, so that the current value of the actual current Ir Is consistent with the current value of the preset current I. Next, a compensation voltage V of the second transistor T2 Is generated based on the compensation current Is, and a compensation signal Is generated based on the compensation voltage V. Finally, the pixel driving circuit is compensated based on the compensation signal. For the structure of the specific pixel driving circuit, please refer to the previous embodiment, which is not described herein.
According to the pixel driving circuit and the compensation method of the pixel driving circuit, the pixel driving circuit with the 3T1C structure is adopted, actual current of the driving transistor in each pixel is detected, threshold voltage of the driving transistor in each pixel is determined according to the actual current, and then effective compensation is carried out on the driving transistor in each pixel, so that the purpose of improving light emitting uniformity of the light emitting device is achieved, and image quality is improved.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.
Claims (6)
1. A pixel driving circuit, comprising: the device comprises a compensation module, a light emitting module and a detection module; the compensation module and the detection module are both connected with the light-emitting module, and the compensation module is connected with the detection module;
the compensation module is connected with a current-level scanning signal and a data signal and is used for transmitting the data signal to the light-emitting module under the control of the current-level scanning signal;
the detection module is connected with a control signal and is used for detecting the actual current of the light-emitting module and comparing the actual current with a preset current so as to generate a compensation voltage of the light-emitting module;
the compensation module is also used for compensating the data signal according to the compensation voltage under the control of the scanning signal of the current stage;
the compensation module comprises a first transistor and a storage capacitor, wherein the grid electrode of the first transistor is electrically connected to the scanning signal of the current stage, the source electrode of the first transistor is electrically connected to the data signal, and the drain electrode of the first transistor is electrically connected to a first node; the first end of the storage capacitor is electrically connected to the first node, and the second end of the storage capacitor is electrically connected to the previous-stage scanning signal;
the light emitting module includes a second transistor and a light emitting device; the grid electrode of the second transistor is electrically connected to the first node, the source electrode of the second transistor is electrically connected to a power signal, and the drain electrode of the second transistor is electrically connected to a second node; the cathode end of the light-emitting device is electrically connected to the second node, and the anode end of the light-emitting device is electrically connected to the ground end;
the detection module comprises a third transistor; a gate of the third transistor is electrically connected to the control signal, a drain of the third transistor is electrically connected to a current detection module, the current detection module is configured to detect an actual current of the light emitting module and compare the actual current with a preset current to generate a compensation voltage of the light emitting module, and a source of the third transistor is electrically connected to the second node;
the driving timing of the pixel driving circuit includes:
an initialization stage, in which the current-stage scanning signal is at a low potential, the control signal is at a low potential, the previous-stage scanning signal is at a high potential, the second transistor is turned on, and the power signal is transmitted to the light emitting device through the second transistor;
a threshold voltage detection stage, in which the current-stage scanning signal is at a low potential, the control signal is at a high potential, the previous-stage scanning signal is at a high potential, the second transistor is turned on, the third transistor is turned on, the power signal is transmitted to the light emitting device through the second transistor, the detection module detects an actual current output by a drain of the second transistor, and calculates a difference between the actual current and a preset current to calculate a compensation voltage of the second transistor;
and a threshold voltage compensation stage, in which the current-stage scanning signal is at a high potential, the control signal is at a high potential, the previous-stage scanning signal is at a low potential, the first transistor is turned on, the second transistor is turned on, the data signal is transmitted to a gate of the second transistor through the first transistor, the compensation module compensates the data signal according to the compensation voltage, and the power signal is transmitted to the light emitting device through the second transistor.
2. The pixel driving circuit according to claim 1, wherein the storage capacitor includes a first plate and a second plate disposed opposite to each other, the first plate is electrically connected to the first node, the second plate is a scan line, and the scan line is used for inputting the previous scan signal.
3. The pixel driving circuit according to claim 1, wherein the compensation module generates a compensation voltage of the second transistor according to an actual current flowing through the second transistor, generates a compensation signal according to the compensation voltage of the second transistor, and transmits the compensation signal to the first transistor.
4. The pixel driving circuit according to claim 3, wherein the first transistor, the second transistor, and the third transistor are all N-type transistors.
5. The pixel driving circuit according to claim 1, wherein the control signal is provided by an external timer.
6. A compensation method for a pixel driving circuit according to any one of claims 1 to 5, comprising:
detecting an actual current of a second transistor of the pixel driving circuit;
calculating a difference value between the actual current and a preset current, and generating a compensation signal according to the difference value;
and compensating the pixel driving circuit based on the compensation signal.
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| CN201910260987.3A CN109935205B (en) | 2019-04-02 | 2019-04-02 | Pixel driving circuit and compensation method of pixel driving circuit |
| PCT/CN2019/082983 WO2020199250A1 (en) | 2019-04-02 | 2019-04-17 | Pixel drive circuit and compensation method for pixel drive circuit |
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| CN201910260987.3A CN109935205B (en) | 2019-04-02 | 2019-04-02 | Pixel driving circuit and compensation method of pixel driving circuit |
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| CN110689837B (en) * | 2019-10-29 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| CN111540301A (en) * | 2020-01-15 | 2020-08-14 | 重庆康佳光电技术研究院有限公司 | Pixel compensation circuit, display substrate and display device |
| US11244604B2 (en) | 2020-01-15 | 2022-02-08 | Chongqing Konka Photoelectric Technology Research Institute Co., Ltd. | Pixel compensation circuit, display substrate, and display device |
| CN111445852A (en) * | 2020-05-06 | 2020-07-24 | Oppo广东移动通信有限公司 | Pixel compensation circuit, display device and compensation method |
| CN114067722A (en) * | 2020-08-06 | 2022-02-18 | 深圳市柔宇科技股份有限公司 | Pixel driving circuit, display panel and pixel driving method |
| CN112863444B (en) * | 2021-01-13 | 2022-05-03 | 深圳市华星光电半导体显示技术有限公司 | Compensation voltage calculation method of driving circuit |
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| CN109935205A (en) | 2019-06-25 |
| WO2020199250A1 (en) | 2020-10-08 |
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