CN113225499B - Active pixel sensor circuit, driving method, display device and flat panel detector - Google Patents
Active pixel sensor circuit, driving method, display device and flat panel detector Download PDFInfo
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- CN113225499B CN113225499B CN202110507620.4A CN202110507620A CN113225499B CN 113225499 B CN113225499 B CN 113225499B CN 202110507620 A CN202110507620 A CN 202110507620A CN 113225499 B CN113225499 B CN 113225499B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
- H04N25/75—Circuitry for providing, modifying or processing image signals from the pixel array
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
- H04N25/62—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels
- H04N25/626—Reduction of noise due to residual charges remaining after image readout, e.g. to remove ghost images or afterimages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
- H04N25/77—Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components
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Abstract
The invention discloses an active pixel sensor circuit, a driving method, a display device and a flat panel detector, wherein the circuit comprises a reset module, an amplification module, a reading module, a leakage suppression module and a data voltage module; the reset module is used for resetting the control end of the amplification module under the control of the reset signal end; the leakage current suppression module is used for suppressing the leakage current of the control end of the amplification module through the reset module after the control end of the amplification module is reset; the data voltage module is used for inputting data voltage to the control end of the amplifying module when the electric leakage suppression module is in a conducting state; the reading module is used for sending the data voltage to the target object in a conducting state. The technical scheme of the invention can ensure the uniformity of the voltage variation of the control end of the amplifying module and improve the image quality of the APS circuit.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to an active pixel sensor circuit, a driving method, a display device and a flat panel detector.
Background
An Active Pixel Sensor (APS) circuit has been considered as one of the necessary Pixel structures for various products, because it can greatly improve the sensitivity due to the signal amplification effect, and can satisfy the problem of insufficient signal amount at high frame frequency.
Under a general condition, the APS circuit comprises a reset module, an amplification module, a reading module and a data voltage module, wherein after the reset module resets a control terminal of the amplification module, the reset module is switched from on to off, and the potential of the control terminal of the reset module changes, and due to the existence of parasitic capacitance, the potential of a first terminal of the reset module or the potential of a second terminal of the reset module can change, so that the first terminal of the reset module or the second terminal of the reset module forms a potential difference to form a leakage path, and the voltage of the control terminal of the amplification module can leak electricity from the leakage path, which causes the voltage change quantity of the control terminal of the amplification module to be uneven, thereby affecting the image quality of the APS circuit.
Disclosure of Invention
The invention mainly aims to provide an active pixel sensor circuit, a driving method, a display device and a flat panel detector, and aims to solve the problem that in the prior art, the image quality of an APS circuit is influenced due to the fact that the voltage change quantity of a control end of an amplification module is not uniform.
In view of the above problems, the present invention provides an active pixel sensor circuit, which includes a reset module, an amplification module, a reading module, a leakage suppression module, and a data voltage module;
the control end of the reset module is used for being electrically connected with the reset signal end; the first end of the reset module and the first end of the amplification module are respectively used for being electrically connected with a first power supply module; the second end of the reset module and the first end of the leakage suppression module are respectively electrically connected with the second end of the data voltage module;
the second end of the amplifying module is electrically connected with the first end of the reading module; the control end of the amplifying module is electrically connected with the second end of the electric leakage suppression module; the second end of the reading module is used for being electrically connected with a target object; the control end of the reading module is used for being electrically connected with the signal reading end; the control end of the electric leakage suppression module is used for being electrically connected with the control signal end; the first end of the data voltage module is electrically connected with the second power supply module;
the reset module is used for resetting the control end of the amplification module under the control of the reset signal end;
the leakage current suppression module is used for suppressing the leakage current of the control end of the amplification module through the reset module after the control end of the amplification module is reset;
the data voltage module is used for inputting data voltage to the control end of the amplifying module in the conducting state of the electric leakage suppression module;
the reading module is used for sending the data voltage to the target object in a conducting state.
Further, in the active pixel sensor circuit, the control signal terminal includes the first power module;
the control end of the electric leakage suppression module is electrically connected with the first power supply module;
the leakage suppression module is in a normally open state under the control of the first power supply module.
Further, in the active pixel sensor circuit, the control signal terminal includes a third power module;
the control end of the electric leakage suppression module is electrically connected with the third power supply module;
the leakage suppression module is in a normally open state under the control of the third power module.
Further, in the active pixel sensor circuit described above, the control signal terminal includes the signal reading terminal;
the control end of the electric leakage suppression module is electrically connected with the signal reading end;
and the electric leakage suppression module is synchronously switched on or off with the reading module under the control of the signal reading end.
Further, in the active pixel sensor circuit, the reset module includes a first transistor;
the control end of the first transistor is used as the control end of the reset module, and the control end of the first transistor is used for being electrically connected with the reset signal end;
a first end of the first transistor is used as a first end of the reset module, and the first end of the first transistor is used for being electrically connected with the first power supply module;
the second end of the first transistor is used as the second end of the reset module, and the second end of the first transistor is electrically connected with the second end of the data voltage module.
Further, in the active pixel sensor circuit, the amplifying block includes a second transistor;
the control end of the second transistor is used as the control end of the amplifying module, and the control end of the second transistor is used for being electrically connected with the second end of the leakage suppression module;
a first end of the second transistor is used as a first end of the amplifying module, and the first end of the second transistor is used for being electrically connected with the first power supply module;
the second end of the second transistor is used as the second end of the amplifying module, and the second end of the second transistor is electrically connected with the first end of the reading module.
Further, in the active pixel sensor circuit, the reading module includes a third transistor;
the control end of the third transistor is used as the control end of the reading module, and the control end of the third transistor is used for being electrically connected with the signal reading end;
a first end of the third transistor is used as a first end of the reading module, and the first end of the third transistor is electrically connected with a second end of the amplifying module;
the second end of the third transistor is used as the second end of the reading module, and the second end of the third transistor is used for being electrically connected with the target object.
Further, in the active pixel sensor circuit described above, the leakage current suppressing module includes a fourth transistor;
a control end of the fourth transistor is used as a control end of the leakage suppression module, and the control end of the fourth transistor is electrically connected with the control signal end;
a first end of the fourth transistor is used as a first end of the leakage suppression module, and the first end of the fourth transistor is electrically connected with the second end of the data voltage module;
a second end of the fourth transistor is used as a second end of the leakage suppression module, and the second end of the fourth transistor is electrically connected with the control end of the amplification module.
Further, in the active pixel sensor circuit, the data voltage module includes a photodiode;
the anode end of the photosensitive diode is used as the first end of the data voltage module, and the anode end of the photosensitive diode is electrically connected with the second power supply module;
and the cathode end of the photosensitive diode is used as the second end of the data voltage module, and the cathode end of the photosensitive diode is used for being electrically connected with the first end of the electric leakage suppression module.
The invention also provides a driving method, which is applied to the active pixel sensor circuit, wherein the active pixel sensor circuit comprises a signal level reading stage, a reset stage and a reset level reading stage which are sequentially arranged; the method comprises the following steps:
in the signal level reading stage, a control signal indicating conduction is input through the control signal end to control the conduction of the electric leakage suppression module; inputting a reading signal representing conduction through the signal reading end to control the conduction of the reading module; inputting a maintaining signal through the reset signal end, controlling the reset signal end to be cut off so that the data voltage module inputs a data voltage to the control end of the amplifying module, and sending the data voltage to the target object;
in the reset stage, a control signal indicating conduction is input through the control signal end to control the conduction of the electric leakage suppression module; inputting a reset signal through the reset signal end, and controlling the reset module to be conducted so as to reset the control end of the amplification module;
in the reset level reading stage, a control signal indicating conduction is input through the control signal end to control the conduction of the electric leakage suppression module; inputting a reading signal representing conduction through the signal reading end to control the conduction of the reading module; and inputting a maintaining signal through the reset signal end, controlling the reset signal end to be cut off, and sending the current voltage of the control end of the amplifying module to the target object.
Further, in the driving method, the active pixel sensor circuit further includes a ghost elimination stage arranged after the signal level readout stage and before the reset stage; the method further comprises the following steps:
in the ghost eliminating stage, a control signal indicating conduction is input through the control signal end to control the conduction of the electric leakage suppression module; a reset signal is input through the reset signal end, the conduction of the reset module is controlled, and the control end of the amplification module is reset; simultaneously inputting voltage turnover signals through the first power supply module and the second power supply module to eliminate residual shadows in the image;
in the reset stage, a maintenance working voltage signal is input through the first power supply module and the second power supply module; the control signal which represents conduction is input through the control signal end, and the conduction of the electric leakage suppression module is controlled; and a reset signal is input through the reset signal end to control the conduction of the reset module so as to reset the control end of the amplification module.
The invention also provides a display device comprising an active pixel sensor circuit as described above.
The invention also provides a flat panel detector comprising an active pixel sensor circuit as described above.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
according to the active pixel sensor circuit, the driving method, the display device and the panel detector, the electric leakage suppression module is arranged between the reset module and the amplification module, so that after the control end of the amplification module is reset, if a leakage path is generated, but the electric leakage suppression module is still in a conducting state, the voltage difference between the first end of the electric leakage suppression module and the second end of the electric leakage suppression module is small, the potential of the second end of the electric leakage suppression module can be well maintained, meanwhile, the resistance of the electric leakage suppression module can reach the kilohm level in the conducting state, the leakage amount of the electric leakage suppression module is small in the same time, the uniformity of the voltage variation of the control end of the amplification module is ensured, and the image quality of the APS circuit is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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 principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an APS circuit of the prior art;
FIG. 2 is a schematic diagram of an embodiment of an active pixel sensor circuit according to the present invention;
FIG. 3 is a timing diagram of the active pixel sensor circuit of the present invention;
FIG. 4 is another timing control diagram of the active pixel sensor circuit of the present invention;
FIG. 5 is a schematic diagram of another embodiment of an active pixel sensor circuit according to the present invention;
FIG. 6 is a schematic diagram of an active pixel sensor circuit according to yet another embodiment of the present invention;
fig. 7 is a schematic diagram of an active pixel sensor circuit according to yet another embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
The transistors used in all embodiments of the present invention may be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. In the embodiment of the invention, in order to distinguish two poles of the transistor except the control terminal, one pole is called a first pole, and the other pole is called a second terminal.
In practical operation, when the transistor is a triode, the control terminal may be a base, the first terminal may be a collector, and the second terminal may be an emitter; alternatively, the control terminal may be a base, the first terminal may be an emitter, and the second terminal may be a collector.
In practical operation, when the transistor is a thin film transistor or a field effect transistor, the control terminal may be a gate, the first terminal may be a drain, and the second terminal may be a source; alternatively, the control terminal may be a gate, the first terminal may be a source, and the second terminal may be a drain.
Fig. 1 is a schematic diagram of an APS circuit in the prior art, and as shown in fig. 1, the APS circuit may include a reset module 11, an amplification module 12, a read module 13, and a data voltage module 15. The control end of the reset module 11 is used for being electrically connected with a reset signal end; the first end of the reset module 11 and the first end of the amplifying module 12 are respectively used for being electrically connected with a first power module VDD; the second end of the reset module 11 and the control end of the amplifying module 12 are electrically connected to the second end of the data voltage module 15, respectively; the second end of the amplifying module 12 is electrically connected with the first end of the reading module 13; the second end of the reading module 13 is used for electrically connecting with a target object; the control end of the reading module 13 is used for being electrically connected with the signal reading end; a first terminal of the data voltage module 15 is used for electrical connection with a second power supply module. The target object may be a light emitting diode, and the second terminal of the data voltage module 15 may be a signal output terminal Vout of the APS circuit.
In the signal level readout stage S1, the reset module 11 is turned off, the data voltage module 15 inputs the data voltage to the control terminal of the amplifying module 12, the reading module 13 is turned on under the control of the signal reading terminal, and the data voltage can be input to the target object.
In the reset phase, the reset module 11 is turned on, an initial voltage is input to the control terminal of the amplification module 12 to reset the control terminal of the amplification module 12, after the control terminal of the amplification module 12 is reset, the reset module 11 is turned from on to off, the potential of the control terminal of the reset module 11 changes, and due to the existence of parasitic capacitance, the potential of the first terminal of the reset module 11 or the potential of the second terminal of the reset module 11 changes, so that a potential difference is formed at the first terminal of the reset module 11 or the second terminal of the reset module 11, a leakage path Ioff is formed, and the voltage change at the control terminal of the amplification module 12 is uneven, thereby affecting the image quality of the APS circuit.
Therefore, in order to solve the above technical problems, the present invention provides the following technical solutions:
example one
Fig. 2 is a schematic structural diagram of an embodiment of an active pixel sensor circuit of the present invention, and as shown in fig. 2, the APS circuit of the present embodiment may include a reset module 11, an amplifying module 12, a reading module 13, a leakage suppression module 14, and a data voltage module 15.
In one implementation, the leakage suppression module 14 may be connected in series between the reset module 11 and the amplification module 12. Specifically, the control terminal of the reset module 11 is used for being electrically connected with the reset signal terminal VRST; the first end of the reset module 11 and the first end of the amplifying module 12 are respectively used for being electrically connected with a first power module VDD; the second end of the reset module 11 and the first end of the leakage suppression module 14 are electrically connected to the second end of the data voltage module 15, respectively; the second end of the amplifying module 12 is electrically connected with the first end of the reading module 13; the control end of the amplifying module 12 is electrically connected with the second end of the leakage current suppressing module 14; the second end of the reading module 13 is used for electrically connecting with a target object; the control end of the reading module 13 is used for being electrically connected with a signal reading end Vread; the control end of the leakage suppression module 14 is used for being electrically connected with the control signal end U; a first terminal of the data voltage block 15 is used for electrical connection with the second power supply block Vbias.
In a specific implementation process, the reset module 11 is configured to reset the control terminal of the amplification module 12 under the control of the reset signal terminal VRST, for example, the reset signal terminal VRST may input a high level signal to turn on the reset module 11, so as to reset the control terminal of the amplification module 12. The leakage current suppression module 14 is configured to suppress a leakage current of the control terminal of the amplification module 12 through the reset module 11 after the control terminal of the amplification module 12 is reset; the data voltage module 15 is configured to input a data voltage to the control terminal of the amplifying module 12 in a conducting state of the leakage suppression module 14, so as to control the amplifying module 12 to be conducted when the data voltage meets a conducting condition of the amplifying module 12; the reading module 13 is configured to send the data voltage to the target object in a conducting state.
In a specific implementation process, the control signal terminal U may include a first power module VDD, and the control terminal of the leakage suppression module 14 is configured to be electrically connected to the first power module VDD; the leakage suppression module 14 is normally open under the control of the first power supply module VDD, and if the first power supply module VDD inputs a high level signal to the leakage suppression module 14, the leakage suppression module 14 is normally open. The control signal terminal U may further include a third power module VGH; the control terminal of the leakage current suppressing module 14 is used for being electrically connected with the third power supply module VGH; the leakage suppression module 14 is in a normally open state under the control of the third power supply module VGH, and if the third power supply module VGH inputs a high level signal to the leakage suppression module 14, the leakage suppression module 14 is in the normally open state. The control signal terminal U may further include a signal read terminal Vread; the control end of the leakage suppression module 14 is used for being electrically connected with the signal reading end Vread; the leakage suppression module 14 is controlled by the signal reading terminal Vread to be turned on or off synchronously with the reading module 13, and if the signal reading terminal Vread sends a high level signal, the leakage suppression module 14 and the reading module 13 are turned on synchronously; if the signal reading end Vread sends a low level signal, the leakage suppression module 14 and the reading module 13 are turned off synchronously.
In a specific implementation process, after the control terminal of the amplifying module 12 is reset, if a leakage path is formed, if the voltage of the first terminal of the leakage current suppressing module 14 is greater than the voltage of the second terminal of the leakage current suppressing module 14, the leakage current flows from the first terminal of the leakage current suppressing module 14 to the second terminal of the leakage current suppressing module 14, and the first terminal of the leakage current suppressing module 14 may charge the second terminal of the leakage current suppressing module 14. If the voltage at the first end of the leakage current suppressing module 14 is lower than the voltage at the second end of the leakage current suppressing module 14, the leakage current flows from the second end of the leakage current suppressing module 14 to the first end of the leakage current suppressing module 14, which is equivalent to the neutralization and cancellation of the leakage current. If the voltage of the first terminal of the leakage suppression module 14 is equal to the voltage of the second terminal of the leakage suppression module 14, no current is generated between the first terminal of the leakage suppression module 14 and the second terminal of the leakage suppression module 14.
In this process, since the leakage suppression module 14 is still in the on state, the potentials of the first end of the leakage suppression module 14 and the second end of the leakage suppression module 14 are relatively close, the point voltage difference between the first end of the leakage suppression module 14 and the second end of the leakage suppression module 14 is small, and the potential of the second end of the leakage suppression module 14 can be well maintained. And the resistance of the leakage current suppression module 14 can reach kilohm level in the conducting state, compared with the prior art that the reset module 11 and the amplification module 12 are directly connected by adopting a lead, the charging and discharging speed of the leakage current suppression module 14 is less than that of the lead, and the leakage amount of the leakage current suppression module 14 in the same time is less than that of the lead. Therefore, the variation of the data voltage of the control terminal of the amplifying block 12 can be reduced by the leakage suppressing block 14.
In one particular implementation, the active pixel sensor circuit includes a signal level readout phase S1, a reset phase S2, and a reset level readout phase S3, which are arranged in sequence. The active pixel sensor circuit can be driven according to the timing control diagram shown in fig. 3, wherein fig. 3 is a timing control diagram of the active pixel sensor circuit of the present invention.
In the signal level readout stage S1, a control signal indicating conduction is input through the control signal terminal U to control the conduction of the leakage suppression module 14; reading signals which indicate conduction are input through a signal reading end Vread, and the reading module 13 is controlled to be conducted; a maintaining signal is input through the reset signal terminal VRST, the reset signal terminal VRST is controlled to be cut off, so that the data voltage module 15 inputs data voltage to the control terminal of the amplifying module 12, and the data voltage input by the control terminal of the amplifying module 12 is sent to a target object;
in the reset stage S2, a control signal indicating conduction is input through the control signal terminal U to control the conduction of the leakage suppression module 14; inputting a reset signal through the reset signal terminal VRST, and controlling the conduction of the reset signal terminal VRST so as to reset the control terminal of the amplification module 12;
in the reset level readout stage S3, a control signal indicating conduction is input through the control signal terminal U to control conduction of the leakage suppression module 14; a reading signal which indicates conduction is input through a signal reading end Vread, and the reading module 13 is controlled to be conducted; the reset signal terminal VRST inputs a maintaining signal to control the reset signal terminal VRST to be cut off, and sends the current voltage of the control terminal of the amplifying module 12 to the target object, so that the target object subtracts the current voltage of the control terminal of the amplifying module 12 from the input data voltage of the control terminal of the amplifying module 12, and removes noise in data.
In one implementation, the active pixel sensor circuit further includes an afterimage clearing stage S4 disposed after the signal level readout stage S1 and before the reset stage S2.
The active pixel sensor circuit can be driven according to the timing control diagram shown in fig. 4, wherein fig. 4 is another timing control diagram of the active pixel sensor circuit of the present invention.
In the ghost eliminating stage S4, the control signal indicating the conduction is input through the control signal terminal U to control the conduction of the leakage suppression module 14; inputting a reset signal through the reset signal terminal VRST, controlling the conduction of the reset signal terminal VRST to reset the control terminal of the amplifying module 12; meanwhile, a voltage turnover signal is input through the first power supply module VDD and the second power supply module Vbias to clear the ghost.
Specifically, before the second power module Vbias is not turned over, some residual electrons in the voltage module 15 may be released in a delayed manner, so that an image has an afterimage, and after the second power module Vbias inputs a voltage turning signal, the residual electrons in the voltage module 15 are neutralized, which is equivalent to performing a reset operation on the voltage module 15, and the residual electrons are not released any more, so that the afterimage can be cleared.
In the reset stage, a control signal indicating conduction is input through the control signal terminal U to control the conduction of the leakage suppression module 14; the reset signal terminal VRST is controlled to be turned on by inputting a reset signal through the reset signal terminal VRST, so as to reset the control terminal of the amplifying module 12.
In the active pixel sensor circuit of this embodiment, the leakage current suppressing module 14 is disposed between the reset module 11 and the amplifying module 12, so that after the control terminal of the amplifying module 12 is reset, if a leakage current path occurs, but because the leakage current suppressing module 14 is still in a conducting state, a voltage difference between the first terminal of the leakage current suppressing module 14 and the second terminal of the leakage current suppressing module 14 is small, a potential of the second terminal of the leakage current suppressing module 14 can be better maintained, and meanwhile, when the leakage current suppressing module 14 is in a conducting state, a resistance can reach a kilohm level, and a leakage current amount of the leakage current suppressing module 14 is small within the same time, thereby ensuring uniformity of a voltage variation amount of the control terminal of the amplifying module 12, and improving image quality of the APS circuit.
Example two
Fig. 5 is a schematic structural diagram of another embodiment of the active pixel sensor circuit of the present invention, and as shown in fig. 5, the active pixel sensor circuit of this embodiment further describes in more detail the technical solution of the present invention on the basis of the above embodiment.
As shown in fig. 5, the active pixel sensor circuit of this embodiment takes an example that the control signal terminal U includes the first power module VDD to explain the technical solution of the present invention.
In one specific implementation, the reset module 11 includes a first transistor T1. A control terminal of the first transistor T1 is used as a control terminal of the reset module 11, and a control terminal of the first transistor T1 is used for being electrically connected with the reset signal terminal VRST; a first terminal of the first transistor T1 is used as a first terminal of the reset module 11, and a first terminal of the first transistor T1 is used for being electrically connected with the first power module VDD; the second terminal of the first transistor T1 serves as the second terminal of the reset block 11, and the second terminal of the first transistor T1 is electrically connected to the second terminal of the data voltage block 15.
In one specific implementation, the amplification module 12 includes a second transistor T2; the control terminal of the second transistor T2 is used as the control terminal of the amplifying module 12, and the control terminal of the second transistor T2 is used for being electrically connected with the second terminal of the leakage current suppressing module 14; a first terminal of the second transistor T2 is used as a first terminal of the amplifying module 12, and a first terminal of the second transistor T2 is used for being electrically connected with the first power module VDD; the second terminal of the second transistor T2 serves as the second terminal of the amplifying block 12, and the second terminal of the second transistor T2 is electrically connected to the first terminal of the reading block 13.
In one specific implementation, the reading module 13 includes a third transistor T3; a control end of the third transistor T3 is used as a control end of the reading module 13, and a control end of the third transistor T3 is used for being electrically connected with a signal reading end Vread; a first terminal of the third transistor T3 is used as a first terminal of the reading module 13, and a first terminal of the third transistor T3 is electrically connected to a second terminal of the amplifying module 12; the second terminal of the third transistor T3 is used as the second terminal of the read module 13, and the second terminal of the third transistor T3 is used for electrical connection with the target object.
In one specific implementation, the leakage current suppressing module 14 includes a fourth transistor T4; a control terminal of the fourth transistor T4 is used as a control terminal of the leakage current suppressing module 14, and a control terminal of the fourth transistor T4 is electrically connected to the control signal terminal U; a first terminal of the fourth transistor T4 is used as a first terminal of the leakage current suppressing module 14, and a first terminal of the fourth transistor T4 is electrically connected to a second terminal of the data voltage module 15; a second terminal of the fourth transistor T4 is used as a second terminal of the leakage current suppressing module 14, and a second terminal of the fourth transistor T4 is electrically connected to the control terminal of the amplifying module 12.
In one specific implementation, the data voltage module 15 includes a photodiode, wherein a capacitor is disposed in the photodiode. The anode end of the photodiode is used as the first end of the data voltage module 15, and the anode end of the photodiode is used for being electrically connected with the second power module Vbias; the cathode terminal of the photodiode serves as the second terminal of the data voltage block 15, and the cathode terminal of the photodiode is electrically connected to the first terminal of the leakage current suppressing block 14.
In a specific implementation process, all the transistors are N-type thin film transistors, but not limited thereto.
Fig. 6 is a schematic structural diagram of another embodiment of the active pixel sensor circuit of the present invention, and as shown in fig. 6, the active pixel sensor circuit of this embodiment takes an example that the control signal terminal U includes the third power module VGH to explain the technical solution of the present invention.
In a specific implementation process, the difference between the active pixel sensor circuit and the embodiment shown in fig. 5 is that the input signal of the control end of the leakage suppression module 14 is input by the third power module VGH, and other structures are the same as those in the embodiment shown in fig. 5, and please refer to the related description above for details, which is not repeated herein.
Fig. 7 is a schematic structural diagram of another embodiment of the active pixel sensor circuit of the present invention, and as shown in fig. 7, the active pixel sensor circuit of this embodiment takes an example that the control signal terminal U includes a signal reading terminal Vread to explain the technical solution of the present invention.
In a specific implementation process, the difference between the active pixel sensor circuit and the embodiment shown in fig. 5 is that an input signal of the control terminal of the leakage suppression module 14 is input by the signal reading terminal Vread, and other structures are the same as those of the embodiment shown in fig. 5, and please refer to the above related description for details, which is not repeated herein.
In one specific implementation, the operation of the active pixel sensor circuit is described by taking the active pixel sensor circuit shown in fig. 7 as an example. The Read signal controls the gate of T3/T4, and the Rst signal controls the gate of T1.
Signal level sensing stage S1: t2, T3, and T4 are turned on, electric charges are transferred, a/G dot data voltage is changed, and a data voltage of G dot can be input to a target object via T3;
reset phase S2: t1, T3 and T4 are conducted, and the control end of T2 is reset;
a reset level readout phase S3; t2, T3 and T4 are turned on, and the current voltage at the point G is transmitted to the target object, i.e., the reset voltage of the reset phase S2 is transmitted to the target object.
In a specific implementation, the active pixel sensor circuit shown in fig. 7 can also remove the image sticking according to the timing control diagram shown in fig. 4.
Specifically, the signal level sensing stage S1: t2, T3, and T4 are turned on, electric charges are transferred, a/G dot data voltage is changed, and a data voltage of G dot can be input to a target object via T3;
the afterimage removing stage S4 is conducted, T1, T3 and T4 are conducted, and meanwhile, the VDD/Vbias voltage is reversed to be positively biased, so that afterimages in the image are removed.
Reset phase S2: t1, T3 and T4 are turned on, the control terminal of T2 is reset, and the VDD/Vbias voltage is turned back;
a reset level readout phase S3; t1, T2, T3 and T4 are turned on, and the current voltage of the point G is transmitted to the target object.
An embodiment of the present invention provides a display device, which includes the driving circuit of the above embodiment.
The embodiment of the invention provides a flat panel detector which comprises the driving circuit of the embodiment, so that the flat panel detector with high frame frequency, high image quality and low dose can be obtained. The pixel design of APS can greatly increase the sensitivity due to the effect of amplifying the signal, and satisfy the problem of insufficient signal amount at high frame frequency, which has been regarded as one of the necessary pixel structures of dynamic flat panel detector. Under such circumstances, it is an important subject to develop an external compensation circuit required for the APS having excellent image stability and high image quality.
In a specific implementation process, due to the increased awareness of society on information security protection and the popularization of mobile devices, fingerprint unlocking technology is rapidly developing and receiving attention. Fingerprint lines are the inherent characteristics of human bodies, are composed of a series of ridges and valleys on the surface of the skin at the finger tip, and have uniqueness and convenience, so that the application of fingerprints is wider. The fingerprint identification mode comprises optical fingerprint identification, capacitance type fingerprint identification and ultrasonic fingerprint identification. The principle of fingerprint identification is that optical, electrical and acoustic methods are used to read the tiny signal differences between the valleys and ridges to form a fingerprint image, and then algorithm processing and image matching are performed. The optical fingerprint identification is more and more accepted by the mobile phone client terminal, so the APS circuit can be applied to fingerprint identification to ensure the image stability and imaging quality in the fingerprint identification process.
EXAMPLE III
The embodiment of the invention also provides a driving method of the active pixel sensor circuit applied to the embodiment.
In one particular implementation, the active pixel sensor circuit includes a signal level readout phase S1, a reset phase S2, and a reset level readout phase S3, which are sequentially arranged; the driving method may include the steps of:
(1) in the signal level readout stage S1, a control signal indicating conduction is input through the control signal terminal U to control the conduction of the leakage suppression module 14; a reading signal which indicates conduction is input through a signal reading end Vread, and the reading module 13 is controlled to be conducted; the reset signal end VRST is used for inputting a maintaining signal to control the reset signal end VRST to be cut off, so that the data voltage module 15 inputs data voltage to the control end of the amplification module 12, the amplification module 12 is controlled to be switched on when the data voltage meets the switching-on condition of the amplification module 12, and the data voltage is sent to a target object;
(2) in the reset stage S2, a control signal indicating conduction is input through the control signal terminal U to control conduction of the leakage suppression module 14; inputting a reset signal through the reset signal terminal VRST, and controlling the conduction of the reset signal terminal VRST so as to reset the control terminal of the amplification module 12;
(3) in the reset level readout stage S3, a control signal indicating conduction is input through the control signal terminal U to control conduction of the leakage suppression module 14; reading signals which indicate conduction are input through a signal reading end Vread, and the reading module 13 is controlled to be conducted; the reset signal terminal VRST is controlled to be turned off by inputting the sustain signal through the reset signal terminal VRST, and the current voltage of the control terminal of the amplification module 12 is transmitted to the target object.
In one specific implementation, the active pixel sensor circuit further includes a ghost elimination stage S4 disposed after the signal level readout stage and before the reset stage; the method further comprises the following steps:
in the ghost eliminating stage S4, the control signal indicating the conduction is input through the control signal terminal U to control the conduction of the leakage suppression module 14; a reset signal is input through a reset signal end U, and the reset module 11 is controlled to be conducted so as to reset the control end of the amplification module 12; meanwhile, voltage turnover signals are input through a first power supply module VDD and a second power supply module Vbias to eliminate residual images in the image;
in the reset stage, a control signal indicating conduction is input through the control signal terminal U to control the conduction of the leakage suppression module 14; the reset signal terminal VRST is controlled to be turned on by inputting a reset signal through the reset signal terminal VRST, so as to reset the control terminal of the amplifying module 12.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. An active pixel sensor circuit is characterized by comprising a reset module, an amplification module, a reading module, a leakage suppression module and a data voltage module;
the control end of the reset module is used for being electrically connected with the reset signal end; the first end of the reset module and the first end of the amplification module are respectively used for being electrically connected with a first power supply module; the second end of the reset module and the first end of the leakage suppression module are respectively electrically connected with the second end of the data voltage module;
the second end of the amplifying module is electrically connected with the first end of the reading module; the control end of the amplifying module is electrically connected with the second end of the electric leakage suppression module; the second end of the reading module is used for being electrically connected with a target object; the control end of the reading module is used for being electrically connected with the signal reading end; the control end of the electric leakage suppression module is used for being electrically connected with the control signal end; the first end of the data voltage module is electrically connected with the second power supply module;
the reset module is used for resetting the control end of the amplification module under the control of the reset signal end;
the leakage current suppression module is used for suppressing the leakage current of the control end of the amplification module through the reset module after the control end of the amplification module is reset;
the data voltage module is used for inputting data voltage to the control end of the amplifying module when the electric leakage suppression module is in a conducting state;
the reading module is used for sending the data voltage to the target object in a conducting state.
2. The active pixel sensor circuit of claim 1, wherein the control signal terminal comprises the first power supply module;
the control end of the electric leakage suppression module is electrically connected with the first power supply module;
the leakage suppression module is in a normally open state under the control of the first power module.
3. The active pixel sensor circuit of claim 1, wherein the control signal terminal comprises a third power supply module;
the control end of the electric leakage suppression module is electrically connected with the third power supply module;
the leakage suppression module is in a normally open state under the control of the third power module.
4. The active pixel sensor circuit of claim 1, wherein the control signal terminal comprises the signal read terminal;
the control end of the electric leakage suppression module is electrically connected with the signal reading end;
the leakage suppression module is controlled by the signal reading end to be synchronously switched on or switched off with the reading module.
5. The active pixel sensor circuit of claim 1, wherein the reset module comprises a first transistor;
the control end of the first transistor is used as the control end of the reset module, and the control end of the first transistor is used for being electrically connected with the reset signal end;
a first end of the first transistor is used as a first end of the reset module, and the first end of the first transistor is used for being electrically connected with the first power supply module;
the second end of the first transistor is used as the second end of the reset module, and the second end of the first transistor is electrically connected with the second end of the data voltage module.
6. The active pixel sensor circuit of claim 1, wherein the amplification module comprises a second transistor;
the control end of the second transistor is used as the control end of the amplifying module, and the control end of the second transistor is used for being electrically connected with the second end of the leakage suppression module;
a first end of the second transistor is used as a first end of the amplifying module, and the first end of the second transistor is used for being electrically connected with the first power supply module;
the second end of the second transistor is used as the second end of the amplifying module, and the second end of the second transistor is electrically connected with the first end of the reading module.
7. The active pixel sensor circuit of claim 1, wherein the read block comprises a third transistor;
the control end of the third transistor is used as the control end of the reading module, and the control end of the third transistor is used for being electrically connected with the signal reading end;
a first end of the third transistor is used as a first end of the reading module, and the first end of the third transistor is electrically connected with a second end of the amplifying module;
the second end of the third transistor is used as the second end of the reading module, and the second end of the third transistor is used for being electrically connected with the target object.
8. The active pixel sensor circuit of claim 1, wherein the leakage suppression module comprises a fourth transistor;
a control end of the fourth transistor is used as a control end of the leakage suppression module, and the control end of the fourth transistor is electrically connected with the control signal end;
a first end of the fourth transistor is used as a first end of the leakage suppression module, and the first end of the fourth transistor is electrically connected with the second end of the data voltage module;
a second end of the fourth transistor is used as a second end of the leakage suppression module, and the second end of the fourth transistor is electrically connected with the control end of the amplification module.
9. The active pixel sensor circuit of claim 1, wherein the data voltage block comprises a photodiode;
the anode end of the photosensitive diode is used as the first end of the data voltage module, and the anode end of the photosensitive diode is electrically connected with the second power supply module;
and the cathode end of the photosensitive diode is used as the second end of the data voltage module, and the cathode end of the photosensitive diode is electrically connected with the first end of the electric leakage suppression module.
10. A driving method applied to the active pixel sensor circuit according to any one of claims 1 to 9, the active pixel sensor circuit including a signal level readout phase, a reset phase, and a reset level readout phase which are sequentially provided; the method comprises the following steps:
in the signal level reading stage, a control signal indicating conduction is input through the control signal end to control the conduction of the electric leakage suppression module; inputting a reading signal representing conduction through the signal reading end to control the conduction of the reading module; inputting a maintaining signal through the reset signal end, controlling the reset signal end to be cut off so that the data voltage module inputs a data voltage to the control end of the amplifying module, and sending the data voltage to the target object;
in the reset stage, a control signal indicating conduction is input through the control signal end to control the conduction of the electric leakage suppression module; inputting a reset signal through the reset signal end, and controlling the reset module to be conducted so as to reset the control end of the amplification module;
in the reset level reading stage, a control signal indicating conduction is input through the control signal end to control the conduction of the electric leakage suppression module; inputting a reading signal representing conduction through the signal reading end to control the conduction of the reading module; and inputting a maintaining signal through the reset signal end, controlling the reset signal end to be cut off, and sending the current voltage of the control end of the amplifying module to the target object.
11. The driving method according to claim 10, wherein the active pixel sensor circuit further comprises an afterimage clearing phase provided after the signal level readout phase and before the reset phase; the method further comprises the following steps:
in the ghost eliminating stage, a control signal indicating conduction is input through the control signal end to control the conduction of the electric leakage suppression module; a reset signal is input through the reset signal end, the conduction of the reset module is controlled, and the control end of the amplification module is reset; simultaneously inputting voltage turnover signals through the first power supply module and the second power supply module to eliminate residual shadows in the image;
in the reset stage, a maintenance working voltage signal is input through the first power supply module and the second power supply module; the control signal which represents conduction is input through the control signal end, and the conduction of the electric leakage suppression module is controlled; and inputting a reset signal through the reset signal end to control the conduction of the reset module so as to reset the control end of the amplification module.
12. A display device comprising an active pixel sensor circuit according to any one of claims 1 to 9.
13. A flat panel detector comprising an active pixel sensor circuit according to any of claims 1 to 9.
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