CN111383598A - Pixel compensation circuit, control method thereof, display driving device and display equipment - Google Patents
Pixel compensation circuit, control method thereof, display driving device and display equipment Download PDFInfo
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- CN111383598A CN111383598A CN202010340720.8A CN202010340720A CN111383598A CN 111383598 A CN111383598 A CN 111383598A CN 202010340720 A CN202010340720 A CN 202010340720A CN 111383598 A CN111383598 A CN 111383598A
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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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- 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]
- G09G3/3266—Details of drivers for scan electrodes
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The invention discloses a pixel compensation circuit, a control method thereof, a display driving device and display equipment, and relates to the technical field of display, so as to reduce circuit signals and realize a narrow frame effect. The pixel compensation circuit includes a driving transistor, a first switching circuit, a second switching circuit, a light emitting device, a first light emitting signal line, and a second light emitting signal line. The first switch circuit is used for supplying power supply voltage to the input end of the driving transistor under the control of a first light-emitting signal accessed by the first light-emitting signal wire; the second switch circuit is used for controlling the conduction of the driving transistor and the light-emitting device under the control of a second light-emitting signal accessed by the second light-emitting signal wire; the first light-emitting signal and the second light-emitting signal are generated by the same light-emitting signal driving circuit. The invention provides a pixel compensation circuit, a control method thereof, a display driving device and display equipment.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel compensation circuit, a control method thereof, a display driving device and display equipment.
Background
With the continuous development of flexible transparent display technology, an Active-matrix organic light-emitting diode (AMOLED) display device is widely used in various fields as a self-emitting display device with fast response speed and high contrast.
When the AMOLED display device displays an image, the pixel compensation circuit drives the light emitting device to emit light. In order to stabilize the light emission luminance of the light emitting device, the pixel compensation circuit often compensates for the gate-source voltage of the driving transistor that controls the light emission of the light emitting device. When compensating for the gate-source voltage, switching devices are typically added. Controlling the switching on and off of different switching devices requires different control signals, which usually need to be generated by different driving circuits on the driver, resulting in an increased number of driving circuits. Further, the bezel of the display needs to provide a large area for disposing the driver, and it is difficult to achieve the narrow bezel effect which is now sought.
Disclosure of Invention
The invention aims to provide a pixel compensation circuit, a control method thereof, a display driving device and a display device, so as to reduce control signals and realize a narrow frame effect.
The invention provides a pixel compensation circuit. The pixel compensation circuit includes a driving transistor, a first switching circuit, a second switching circuit, a light emitting device, a first light emitting signal line, and a second light emitting signal line;
a first terminal of the first switch circuit is coupled to the first light-emitting signal line, a second terminal of the first switch circuit is coupled to the input terminal of the driving transistor, and the first switch circuit is configured to provide a power supply voltage to the input terminal of the driving transistor under the control of a first light-emitting signal connected to the first light-emitting signal line;
a first terminal of the second switch circuit is coupled to the second light emitting signal line, a second terminal of the second switch circuit is coupled to an output terminal of the driving transistor, a third terminal of the second switch circuit is coupled to the light emitting device, and the second switch circuit is configured to control the driving transistor and the light emitting device to be turned on under the control of a second light emitting signal connected to the second light emitting signal line;
wherein the first light-emitting signal and the second light-emitting signal are generated by the same light-emitting signal driving circuit.
Compared with the prior art, in the pixel compensation circuit provided by the invention, the first light-emitting signal and the second light-emitting signal are generated by the same light-emitting signal driving circuit, and the same light-emitting signal driving circuit generates the same light-emitting signal, at this time, the first light-emitting signal accessed by the first light-emitting signal line and the second light-emitting signal accessed by the second light-emitting signal line are two signals generated after the same light-emitting signal is delayed. Therefore, the pixel compensation circuit provided by the invention utilizes the first light-emitting signal and the second light-emitting signal generated by one light-emitting signal driving circuit to respectively control the first switch circuit and the second switch circuit, and compared with the prior art that each control signal is generated by one light-emitting signal driving circuit, the pixel compensation circuit reduces the number of the driving circuits, further can reduce the area of a frame of a display which needs to be provided for a driver, and can realize the narrow frame effect compared with the prior art.
The invention also provides a control method of the pixel compensation circuit. The control method of the pixel compensation circuit applies the pixel compensation circuit. The control method of the pixel compensation circuit comprises the following steps: in the light emitting stage, under the control of a first light emitting signal, a power supply voltage is supplied to the input end of the driving transistor; controlling the light emitting device to emit light by using the driving transistor under the control of a second light emitting signal; wherein the first light-emitting signal and the second light-emitting signal are generated by the same light-emitting signal driving circuit.
Compared with the prior art, the beneficial effects of the control method of the pixel compensation circuit provided by the invention are the same as the beneficial effects of the pixel compensation circuit in the technical scheme, and are not repeated herein.
The invention also provides a display driving device. The display driving device comprises the pixel compensation circuit.
Compared with the prior art, the beneficial effects of the display driving device provided by the invention are the same as those of the pixel compensation circuit in the technical scheme, and are not repeated herein.
The invention also provides a display device. The display device comprises the display driving device.
Compared with the prior art, the beneficial effects of the display device provided by the invention are the same as those of the pixel compensation circuit in the technical scheme, and are not repeated herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a connection between a display control device and a display panel according to an embodiment of the invention;
FIG. 3 is a diagram illustrating a pixel compensation circuit with positive threshold voltage compensation function according to the related art;
FIG. 4 is a timing diagram of a pixel compensation circuit with positive threshold voltage compensation function in the related art;
FIG. 5 is a diagram of a pixel compensation circuit with positive and negative threshold voltage compensation functions according to the related art;
FIG. 6 is a timing diagram of a pixel compensation circuit with positive and negative threshold voltage compensation functions according to the related art;
FIG. 7 is a diagram of a pixel compensation circuit according to an embodiment of the present invention;
FIG. 8 is a block diagram of a pixel compensation circuit according to an embodiment of the present invention;
FIG. 9 is a block diagram of a pixel compensation circuit according to an embodiment of the invention;
FIG. 10 is a state diagram of a pixel compensation circuit in an initialization stage according to an embodiment of the present invention;
FIG. 11 is a state diagram of the pixel compensation circuit in the threshold compensation stage according to the embodiment of the present invention;
FIG. 12 is a state diagram of the pixel compensation circuit in the data input stage according to the embodiment of the present invention;
FIG. 13 is a state diagram of the pixel compensation circuit in the hold phase according to the embodiment of the present invention;
FIG. 14 is a diagram illustrating a state of the pixel compensation circuit in the light-emitting stage according to the embodiment of the invention.
Detailed Description
In order to facilitate clear description of technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. For example, the first switch tube and the second switch tube are only used for distinguishing different switch tubes, and the sequence thereof is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
It is to be understood that the terms "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b combination, a and c combination, b and c combination, or a, b and c combination, wherein a, b and c can be single or multiple.
The embodiment of the invention provides a pixel compensation circuit. The pixel compensation circuit includes a driving transistor, a first switching circuit, a second switching circuit, a light emitting device, a first light emitting signal line, and a second light emitting signal line. The pixel compensation circuit is applied to a display device. Fig. 1 shows a schematic view of a display device. Referring to fig. 1, the display apparatus includes a display panel 100 and a display control device 200.
As shown in fig. 2, the display control apparatus 200 generally includes a central processor 210, a display controller 220, and a driver 230. The central processing unit 210 is connected to the display controller 220, the central processing unit 210 initializes the display controller 220 to connect with the video memory to form a map, the display controller 220 reads pixel data from the video memory and transmits the pixel data to the driver 230 after processing, and the driver 230 drives the display panel 100 to display an image. The driver 230 is generally disposed at a side of the display panel 100.
As shown in fig. 2, the display panel 100 includes a pixel array 110. Each pixel in the pixel array 110 includes a pixel compensation circuit. Each pixel compensation circuit is connected to the control signal generated by the driver 230 through a signal line. The driver 230 transmits a signal to the pixel compensation circuit through the signal line, thereby lighting the pixels in the display panel 100 and displaying an image.
The light Emitting device in the pixel compensation circuit may be an organic light-Emitting Diode (OLED), or may be another self-light Emitting device.
The driving Transistor may be a Thin Film Transistor (TFT), or may be another Transistor that can meet the operation requirement.
When the driving transistor is a thin film transistor, the thin film transistor may be made of an oxide semiconductor material such as amorphous indium gallium zinc (a-IGZO). Because the oxide semiconductor materials such as amorphous indium gallium zinc (a-IGZO) and the like have the characteristics of transparency, flexibility, low manufacturing temperature and the like, the driving transistor has the effect of flexibility and transparency.
In the above pixel compensation circuit, the driving transistor serves as a core transistor to supply a driving current to the light emitting device, thereby lighting each pixel. The magnitude of the driving current provided by the driving transistor directly determines the luminance of the pixel. In the working process of the pixel compensation circuit, the problem of threshold voltage drift of the driving transistor can occur due to the fact that the driving transistor works under the gate voltage for a long time, and therefore the stability of the driving current is affected.
As shown in fig. 3 and 4, the pixel compensation circuit in the related art compensates for the threshold voltage of the enhancement type (positive threshold voltage) drive transistor.
As shown in fig. 5 and 6, the pixel compensation circuit in the related art can compensate for an enhancement type or a depletion type driving transistor.
As shown in fig. 3 to 6, in order to compensate for the threshold voltage of the driving transistor, a switching device is generally added. Controlling the switching on and off of different switching devices requires different control signals, which usually need to be provided by different driver circuits on the driver, which may result in an increased number of driver circuits. Further, the bezel of the display needs to provide a large area for disposing the driver, and it is difficult to achieve the narrow bezel effect which is now sought.
As shown in fig. 7, in order to solve the above problem, the pixel compensation circuit provided by the embodiment of the invention is improved. Specifically, in the pixel compensation circuit, a first terminal of the first switch circuit 101 is coupled to the first light emitting signal line, a second terminal of the first switch circuit 101 is coupled to the input terminal of the driving transistor T6, and a third terminal of the first switch circuit 101 is coupled to the power supply. The first switch circuit 101 is configured to supply a power supply voltage to an input terminal of the driving transistor T6 under the control of the first light-emitting signal EM (n +1) connected to the first light-emitting signal line.
As shown in fig. 8 and 9, in practical applications, the first switch circuit 101 includes a first switch tube T1. The first terminal of the first switch circuit 101 is a control electrode of the first switch transistor T1, the second terminal of the first switch circuit 101 is an output terminal of the first switch transistor T1, and the third terminal of the first switch circuit 101 is an input terminal of the first switch transistor T1. It should be understood that the first switch transistor T1 may be a thin film transistor, or other switch transistors meeting the operation requirement.
As shown in fig. 7, in the pixel compensation circuit, a first terminal of the second switch circuit 102 is coupled to the second light emitting signal line, a second terminal of the second switch circuit 102 is coupled to the output terminal of the driving transistor T6, and a third terminal of the second switch circuit 102 is coupled to the light emitting device 106. The second switch circuit 102 is used to control the driving transistor T6 and the light emitting device 106 to be conducted under the control of the second light emitting signal EM connected to the second light emitting signal line.
As shown in fig. 8 and 9, in practical applications, the second switch circuit 102 includes a second switch transistor T2. The first terminal of the second switch circuit 102 is a control terminal of the second switch transistor T2, the second terminal of the second switch circuit 102 is an input terminal of the second switch transistor T2, and the third terminal of the second switch circuit 102 is an output terminal of the second switch transistor T2. It should be understood that the second switch transistor T2 may be a thin film transistor, or other switch transistors meeting the operation requirement.
In the pixel compensation circuit, the first emission signal EM (n +1) and the second emission signal EM are generated by the same emission signal driving circuit. At this time, the first emission signal EM (n +1) and the second emission signal EM are two signals having the same waveform and different time delays generated by the same emission signal driving circuit.
In practical applications, the first emission signal EM (n +1) and the second emission signal EM may be signals adjacent to each other in two rows generated by the same emission signal driving circuit. The first emission signal EM (n +1) and the second emission signal EM may also be two signals generated by the same emission signal driving circuit and spaced by two rows.
As shown in fig. 8 and 9, in practical applications, when the first switch circuit 101 and the second switch circuit 102 are both turned on, the driving transistor T6 is turned on with the power supply and the light emitting device 106, and the light emitting device 106 emits light.
In the pixel compensation circuit provided in the embodiment of the present invention, the first emission signal EM (n +1) and the second emission signal EM are generated by the same emission signal driving circuit, and the same emission signal driving circuit generates the same emission signal, at this time, the first emission signal EM (n +1) connected to the first emission signal line and the second emission signal EM connected to the second emission signal line are two signals generated after the same emission signal is delayed. Therefore, the pixel compensation circuit provided by the invention utilizes the first light-emitting signal EM (n +1) and the second light-emitting signal EM generated by one light-emitting signal driving circuit to respectively control the first switch circuit 101 and the second switch circuit 102, and compared with the prior art that each control signal needs to be generated by one light-emitting signal driving circuit, the pixel compensation circuit reduces the number of driving circuits, further can reduce the area of a frame of display equipment which needs to be provided for a driver, and can realize a narrow frame effect compared with the prior art. In addition, the first emission signal EM (n +1) and the second emission signal EM in the embodiment of the present invention are two signals generated after the same emission signal is delayed. In practical applications, the small number of signals enables a display screen of the display device to have a higher number of Pixels Per Inch (pixel Per inc, PPI), and the pixel compensation circuit provided by the embodiment of the invention is controlled by only one light-emitting signal, so that the display device formed by using the pixel compensation circuit provided by the embodiment of the invention can have a higher resolution, such as 207 PPI.
As shown in fig. 7, it is understood that the pixel compensation circuit further includes a third switching circuit 103, a first scan signal line, a storage capacitor C1, and a coupling capacitor C2 to input a data voltage to the driving transistor T6 and compensate for a threshold voltage of the driving transistor T6.
As shown in fig. 7, a first terminal of the third switch circuit 103 is coupled to the first scan signal line, a second terminal of the third switch circuit 103 is coupled to the control electrode of the driving transistor T6, and a third terminal of the third switch circuit 103 is coupled to the data signal terminal. The third switch circuit 103 is configured to supply the data voltage to the control electrode of the driving transistor T6 under the control of the first scan signal Sn supplied from the first scan signal line.
As shown in fig. 8 and 9, in practical applications, the third switching circuit 103 includes a third switching tube T3. The first terminal of the third switching circuit 103 is the control electrode of the third switching transistor T3, the second terminal of the third switching circuit 103 is the output terminal of the third switching transistor T3, and the third terminal of the third switching circuit 103 is the input terminal of the third switching transistor T3. It should be understood that the third switch transistor T3 may be a thin film transistor, or other switch transistors meeting the operation requirement.
As shown in fig. 8 and 9, a first terminal of the storage capacitor C1 is coupled to the control electrode of the driving transistor T6, and a second terminal of the storage capacitor C1 is coupled to the output terminal of the driving transistor T6. A first terminal of the coupling capacitor C2 is coupled to the power source, and a second terminal of the coupling capacitor C2 is coupled to a second terminal of the storage capacitor C1.
In summary, in the light emitting stage, the finally obtained light emitting current is
This current is independent of the threshold voltage of the driving transistor T6. That is, the influence of the drift of the threshold voltage of the driving transistor T6 on the light emitting current can be avoided, the threshold voltage of the driving transistor T6 can be compensated, and the stability of the pixel compensation circuit can be improved.
In some embodiments, a first terminal of the coupling capacitor C2 is coupled to a second terminal of the storage capacitor C1, and a second terminal of the storage capacitor C1 is grounded.
As shown in fig. 7, as a possible implementation, the pixel compensation circuit further includes a fourth switching circuit 104 and a second scanning signal line.
As shown in fig. 7, a first terminal of the fourth switch circuit 104 is coupled to the second scan signal line, a second terminal of the fourth switch circuit 104 is coupled to the initialization voltage terminal, a third terminal of the fourth switch circuit 104 is coupled to a third terminal of the second switch circuit 102, and the fourth switch circuit 104 is configured to initialize a voltage of the third terminal of the second switch circuit 102 under the control of the second scan signal Sn-1 connected to the second scan signal line.
In practical applications, as shown in fig. 8 and 9, the fourth switching circuit 104 includes a fourth switching transistor T4. The first terminal of the fourth switching circuit 104 is the control electrode of the fourth switching transistor T4, the second terminal of the fourth switching circuit 104 is the input terminal of the fourth switching transistor T4, and the third terminal of the fourth switching circuit 104 is the output terminal of the fourth switching transistor T4. It should be understood that the fourth switching transistor T4 may be a thin film transistor, or other switching transistors meeting the operation requirement.
As shown in fig. 8, the control electrode of the driving transistor T6 is coupled to the third switch circuit 103 and the storage capacitor C1 at a point a, the output terminal of the driving transistor T6 is coupled to the second switch circuit 102, the storage capacitor C1 and the coupling capacitor C2 at a point B, and the second switch circuit 102 is coupled to the fourth switch circuit 104 at a point C.
As shown in fig. 8 and 9, the fourth switch circuit 104 may initialize the voltage (V) at the point CC) That is, the anode voltage of the light emitting device 106 is initialized, thereby reducing the influence of the residual charge on the light emitting device 106 on the light emitting luminance of the light emitting device 106.
As shown in fig. 8 and 9, the fourth switch circuit 104, in combination with the second switch circuit 102, can initialize the voltage (V) at the point BB) Namely, the voltage at the output terminal of the initialization driving transistor T6 and the voltage at the second terminal of the storage capacitor C1. At this time, the influence of the residual charge on the driving transistor T6 and the storage capacitor C1 can be reduced, and the influence of the luminance of the previous frame on the light emitting device 106 can be reduced, so that the probability of distortion of the image displayed by the display device can be reduced, and the contrast and the image quality of the display device can be improved.
As shown in fig. 7, as a possible implementation, the first scan signal Sn and the second scan signal Sn-1 are generated by the same scan signal driving circuit. At this time, the first scan signal Sn and the second scan signal Sn-1 are two signals with the same waveform and different time delay generated by the same scan signal driving circuit.
In practical applications, the first scan signal Sn and the second scan signal Sn-1 may be signals adjacent to each other in two rows generated by the same scan signal driving circuit. The first scan signal Sn and the second scan signal Sn-1 may also be two signals generated by the same scan signal driving circuit and spaced by two rows.
When the first scanning signal line is connected with the first scanning signal Sn generated by the scanning signal driving circuit and the second scanning signal line is connected with the second scanning signal Sn-1 generated by the scanning signal driving circuit, the signal waveforms generated by one scanning signal driving circuit are the same, so that the first scanning signal Sn and the second scanning signal Sn-1 are two scanning signals generated by the same scanning signal in a delayed mode. In the embodiment of the present invention, the third switch circuit 103 and the fourth switch circuit 104 can be controlled by only one control signal generated by the scan signal driving circuit, which further reduces the number of driving circuits compared to the prior art, and further reduces the area of the frame of the display device that needs to be provided to the driver, thereby further achieving the narrow frame effect compared to the prior art.
Fig. 9 shows a timing diagram of a pixel compensation circuit according to an embodiment of the present invention. It can be seen that the waveforms of the scan signals Sn-1 and Sn and the emission signals EM and EM (n +1) are simple, and the driving circuit in the driver for generating the scan signals and the emission signals can be simplified, so that the space of the frame of the display device occupied by the driver is reduced, the frame of the display device is reduced, and the narrow frame effect is favorably realized.
As a possible implementation, the pixel compensation circuit further includes a fifth switching circuit 105. The first terminal of the fifth switch circuit 105 is coupled to the second scan signal line, the second terminal of the fifth switch circuit 105 is coupled to the reference voltage terminal, the third terminal of the fifth switch circuit 105 is coupled to the control electrode (point a) of the driving transistor T6, and the fifth switch circuit 105 is configured to provide the reference voltage to the control electrode of the driving transistor T6 under the control of the second scan signal Sn-1 connected to the second scan signal line.
In practical applications, the fifth switch circuit 105 includes a fifth switch transistor T5. The first terminal of the fifth switch circuit 105 is the control electrode of the fifth switch transistor T5, the second terminal of the fifth switch circuit 105 is the input terminal of the fifth switch transistor T5, and the third terminal of the fifth switch circuit 105 is the output terminal of the fifth switch transistor T5. It should be understood that the fifth switch transistor T5 may be a thin film transistor, or other switch transistors meeting the operation requirement.
A fifth switch circuit 105 for initializing the voltage (V) at the point AA) That is, the control electrode (gate) voltage of the driving transistor T6 is initializedThe voltage of the first end of the storage capacitor C1. At this time, the influence of the residual charges on the driving transistor T6 and the storage capacitor C1 can be reduced, so that the probability of distortion of the image displayed by the display device can be reduced, and the contrast and the image quality of the display device can be improved.
The fifth switch circuit 105 and the fourth switch circuit 104 are connected to the same scanning signal line (second scanning signal line) and controlled by the same signal. In this case, on one hand, the fifth switch circuit 105 and the fourth switch circuit 104 cooperate to initialize the voltages of the control electrode and the output end of the driving transistor T6 and initialize the voltage of the storage capacitor C1, so that the initial voltages of each frame of the display device are the same, thereby reducing the probability of image distortion and improving the quality of the display device. On the other hand, the fifth switching circuit 105 and the fourth switching circuit 104 are controlled by the same signal, and the pixel compensation circuit signal is further reduced.
When the pixel compensation circuit includes the driving transistor T6, the light emitting device 106, the storage capacitor C1, the coupling capacitor C2, the first switch circuit 101, the second switch circuit 102, the third switch circuit 103, the fourth switch circuit 104, the fifth switch circuit 105, the first light emitting signal line, the second light emitting signal line, the first scanning signal line, and the second scanning signal line, which are described above, a specific connection mode is referred to the above embodiment. Of course, the pixel compensation circuit further includes a power supply, a data signal terminal, a reference voltage terminal, and an initialization voltage terminal. At this time, only two signals are needed for five switching circuits, and the circuit signals are greatly reduced, so that the display screen of the display device can be provided with more pixel numbers (PPI) per inch.
The pixel compensation circuit provided by the embodiment of the invention comprises a plurality of working cycles during working, wherein each working cycle comprises an initialization phase (1), a threshold voltage compensation phase (2), a data input phase (3), a holding phase (4) and a light-emitting phase (5). For convenience of understanding, the operation principle of the pixel compensation circuit provided by the embodiment of the invention is described below by taking as an example that the first switch circuit 101 includes the first switch tube T1, the second switch circuit 102 includes the second switch tube T2, the third switch circuit 103 includes the third switch tube T3, the fourth switch circuit 104 includes the fourth switch tube T4, the fifth switch circuit 105 includes the fifth switch tube T5, and the driving transistor T6 and all the switch tubes are n-type a-IGZO thin film transistors.
As shown in fig. 9 and 10, in the initialization stage (1), the second scan signal Sn-1 is at a high level, and the fifth switch transistor T5 and the fourth switch transistor T4 are turned on. Voltage at point A (V)A) Initializing to reference voltage VREF, voltage at point C (V)C) That is, the anode voltage of the light emitting device 106 is initialized to the initialization voltage Vinit, and the light emitting device 106 does not emit light. The first scan signal Sn is at a low level, and the third switching transistor T3 is turned off. The second light-emitting signal EM is at a high level, the second switch tube T2 is turned on, and the voltage (V) at the point B isB) I.e., the source voltage of the driving transistor T6 is initialized to Vinit. The first light emitting signal EM (n +1) is at a high level, the first switching transistor T1 is turned on, and the power supply voltage VDD is transferred to the drain of the driving transistor T6.
As shown in fig. 9 and 11, at the threshold voltage (V)th) In the compensation phase, the second emission signal EM goes low, and the second switching transistor T2 is turned off. Voltage V at point BBIs charged by the power supply voltage VDD through the driving transistor T6 until the driving transistor T6 is turned off, and finally stabilizes at VA-Vth6I.e., VREF-Vth6In which V isth6Is the threshold voltage of the driving transistor T6. When V isth6Is positive in time VBWill charge to a value less than VREF when Vth6When it is negative, VBWill charge to a value greater than VREF. In the threshold voltage compensation stage, the pixel compensation circuit completes the threshold voltage V to the driving transistor T6thNo matter the V is detectedthEither positive or negative.
As shown in fig. 9 and 12, in the data input stage, the first scan signal Sn is at a high level, and the third switching tube T3 is turned on. The second scan signal Sn-1 goes low and the fourth switching transistor T4 and the fifth switching transistor T5 are turned off. The first light emitting signal EM (n +1) is at a low level, and the first switching tube T1 is turned off. The DATA signal DATA is input to the gate of the driving transistor T6, i.e., VA changes from VREF to DATA. VB becomes by capacitive coupling:
herein, theAt the same time, the voltage across C1 (VC1) becomes:
as shown in fig. 9 and 13, in the hold stage, the second scan signal Sn-1 and the first scan signal Sn are at a low level, and the third switch transistor T3, the fourth switch transistor T4, and the fifth switch transistor T5 are turned off. The second emission signal EM becomes high level, and the second switching tube T2 is turned on. The first light emitting signal EM (n +1) is at a low level, and the first switching tube T1 is turned off. At this stage, the gate-source voltage of the driving transistor T6 remains unchanged.
As shown in fig. 9 and 14, in the light emitting stage, the second scan signal Sn-1 and the first scan signal Sn are maintained at the low level, and the third switch transistor T3, the fourth switch transistor T4, and the fifth switch transistor T5 are turned off. The second emission signal EM is at a high level, and the second switching tube T2 is turned on. The first light emitting signal EM (n +1) is at a high level, and the first switch transistor T1 is turned on. At this time, the voltage across the storage capacitor C1 is the gate-source voltage (VGS6) of the driving transistor T6, and the driving transistor T6 is in saturation state. At this stage, the light emitting device 106 is illuminated and its current (I)OLED) Flows through the first switch transistor T1, the driving transistor T6, the second switch transistor T2 and the light emitting device 106. According to the transistor saturation current formula:
can obtain I at this stageOLEDIs composed of
Where μ is the mobility of the driving transistor T6, CoxFor the gate dielectric capacitance per unit area of the driving transistor T6,
is the channel width-to-length ratio of the driving transistor T6.
The connection mode of the driving transistor T6 in the pixel compensation circuit described above constitutes a source follower structure. In the source follower structure, the gate voltage of the driving transistor T6 can be fixed in the threshold voltage compensation stage, and the output terminal of the driving transistor T6 is charged by the power supply voltage VDD, so that the threshold voltage of the driving transistor T6 can be detected, and whether the threshold voltage is positive or negative, whether the driving transistor T6 can normally operate or not is judged by the threshold voltage, so that the pixel compensation circuit can compensate corresponding pixels, and the stability of the light emitting device is improved.
The embodiment of the invention also provides a control method of the pixel compensation circuit. The control method of the pixel compensation circuit applies the pixel compensation circuit. The control method of the pixel compensation circuit comprises the following steps:
in the light emitting phase, a power supply voltage is supplied to the input terminal of the driving transistor T6 under the control of the first light emitting signal EM (n + 1); under the control of the second light emission signal, the light emitting device 106 is controlled to emit light by the driving transistor T6; wherein the first light emission signal EM (n +1) and the second light emission signal are emitted by the same scan signal driving circuit.
Compared with the prior art, the beneficial effects of the control method of the pixel compensation circuit provided by the embodiment of the invention are the same as the beneficial effects of the pixel compensation circuit in the technical scheme, and are not repeated herein.
The embodiment of the invention also provides a display driving device. The display driving device comprises the pixel compensation circuit.
Compared with the prior art, the beneficial effects of the display driving device provided by the embodiment of the invention are the same as the beneficial effects of the pixel compensation circuit in the technical scheme, and are not repeated herein.
The embodiment of the invention also provides display equipment. The display device comprises the display driving device.
Compared with the prior art, the beneficial effects of the display device provided by the embodiment of the invention are the same as the beneficial effects of the pixel compensation circuit in the technical scheme, and are not repeated herein.
The display device provided by the above embodiment may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, or a navigator.
While the invention has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
While the invention has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A pixel compensation circuit includes a driving transistor, a light emitting device, a first switch circuit, a second switch circuit, a first light emitting signal line, and a second light emitting signal line;
a first terminal of the first switch circuit is coupled to the first light-emitting signal line, a second terminal of the first switch circuit is coupled to the input terminal of the driving transistor, and the first switch circuit is configured to provide a power supply voltage to the input terminal of the driving transistor under the control of a first light-emitting signal connected to the first light-emitting signal line;
a first terminal of the second switch circuit is coupled to the second light emitting signal line, a second terminal of the second switch circuit is coupled to an output terminal of the driving transistor, a third terminal of the second switch circuit is coupled to the light emitting device, and the second switch circuit is configured to control the driving transistor and the light emitting device to be turned on under the control of the second light emitting signal connected to the second light emitting signal line;
wherein the first light-emitting signal and the second light-emitting signal are generated by the same light-emitting signal driving circuit.
2. The pixel compensation circuit according to claim 1, further comprising a third switch circuit, a fourth switch circuit, a first scan signal line, and a second scan signal line;
a first end of the third switch circuit is coupled to the first scan signal line, a second end of the third switch circuit is coupled to the control electrode of the driving transistor, and the third switch circuit is configured to provide a data voltage to the control electrode of the driving transistor under the control of a first scan signal accessed by the first scan signal line;
the first terminal of the fourth switch circuit is coupled to the second scan signal line, the second terminal of the fourth switch circuit is coupled to an initialization voltage terminal, the third terminal of the fourth switch circuit is coupled to the third terminal of the second switch circuit, and the fourth switch circuit is configured to initialize a voltage at the third terminal of the second switch circuit under the control of a second scan signal accessed by the second scan signal line.
3. The pixel compensation circuit of claim 2, wherein the first scan signal and the second scan signal are generated by the same scan signal driving circuit.
4. The pixel compensation circuit according to claim 2, further comprising a fifth switch circuit, wherein a first terminal of the fifth switch circuit is coupled to the second scan signal line, a second terminal of the fifth switch circuit is coupled to a reference voltage terminal, a third terminal of the fifth switch circuit is coupled to the control electrode of the driving transistor, and the fifth switch circuit is configured to provide a reference voltage to the control electrode of the driving transistor under the control of a second scan signal received by the second scan signal line.
5. The pixel compensation circuit according to any one of claims 1 to 4, further comprising a storage capacitor, wherein a first terminal of the storage capacitor is coupled to the control electrode of the driving transistor, and a second terminal of the storage capacitor is coupled to the output terminal of the driving transistor.
6. The pixel compensation circuit of claim 5,
the pixel compensation circuit further comprises a coupling capacitor, wherein a first end of the coupling capacitor is coupled to a power supply, a second end of the coupling capacitor is coupled to a second end of the storage capacitor, or the first end of the coupling capacitor is coupled to the second end of the storage capacitor, and the second end of the storage capacitor is grounded.
7. The pixel compensation circuit of claim 1, wherein the first switching circuit comprises a first switching tube and the second switching circuit comprises a second switching tube.
8. A control method of a pixel compensation circuit, wherein the pixel compensation circuit according to any one of claims 1 to 7 is applied, the control method of the pixel compensation circuit comprising:
in the light emitting stage, under the control of a first light emitting signal, a power supply voltage is supplied to the input end of the driving transistor; controlling the light emitting device to emit light by using the driving transistor under the control of a second light emitting signal;
wherein the first light-emitting signal and the second light-emitting signal are generated by the same light-emitting signal driving circuit.
9. A display driving device comprising the pixel compensation circuit according to any one of claims 1 to 7.
10. A display device comprising the display driving apparatus according to claim 9.
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| CN202010340720.8A CN111383598A (en) | 2020-04-26 | 2020-04-26 | Pixel compensation circuit, control method thereof, display driving device and display equipment |
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| CN202010340720.8A CN111383598A (en) | 2020-04-26 | 2020-04-26 | Pixel compensation circuit, control method thereof, display driving device and display equipment |
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