CN113963647B - Pixel circuit, display device and control method thereof - Google Patents
Pixel circuit, display device and control method thereof Download PDFInfo
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- CN113963647B CN113963647B CN202010704897.1A CN202010704897A CN113963647B CN 113963647 B CN113963647 B CN 113963647B CN 202010704897 A CN202010704897 A CN 202010704897A CN 113963647 B CN113963647 B CN 113963647B
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- 238000010586 diagram Methods 0.000 description 3
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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
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
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Abstract
The invention discloses a pixel circuit, a display device and a control method thereof, wherein the display device comprises a column control module, a row control module and a display array formed by a plurality of pixel circuits, and the column control module and the row control module are connected with the pixel circuits; the column control module is used for providing data signals for each column of the pixel circuits in the display array; the row control module is used for providing scanning signals and control signals for each row of pixel circuits in the display array, controlling the pixel circuits to write data signals in a data writing stage and lighting up according to the data signals in a display stage; the invention can effectively overcome the limitation of the maximum frequency of the circuit operation components on the frame rate and the gray scale number, and improve the picture display quality.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a display device, and a control method thereof.
Background
The pulse width modulation method of active driving is to divide each frame into a plurality of subfields, and combine the desired total time length by using the switches of the subfields. The display array is typically driven line by line using an actively driven pulse width modulation method. Under the control mode of pulse width modulation, the frame rate and the gray scale number depend on the scanning speed, and the scanning speed is limited by the working frequency of the circuit components. The operating frequency of these circuit elements limits the length of the shortest subfield, thereby limiting the frame rate and the number of gray scales, and reducing the picture display quality.
There is thus a need for improvements and improvements in the art.
Disclosure of Invention
The invention aims to provide a pixel circuit, a display device and a control method thereof, which can effectively overcome the limitation of the maximum frequency of circuit operation components on the frame rate and the gray scale number and improve the picture display quality.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A display device comprises a column control module, a row control module and a display array formed by a plurality of pixel circuits, wherein the column control module and the row control module are connected with the pixel circuits;
the column control module is used for providing data signals for each column of the pixel circuits in the display array;
the row control module is used for providing scanning signals and control signals for each row of pixel circuits in the display array, controlling the pixel circuits to write data signals in a data writing stage, and lighting up according to the data signals in a display stage.
In the display device, a plurality of pixel circuits form a display array in a matrix array mode.
In the display device, the row control module comprises a first shift register and a second shift register, and the first shift register and the second shift register are connected with the pixel circuit;
The first shift register is used for providing scanning signals for each row of pixel circuits in the display array and controlling the pixel circuits to write the data signals in a data writing stage;
The second shift register is used for respectively providing control signals for the pixel circuits of each row, controlling the pixel circuits to be lightened according to the data signals in a display stage, and controlling the control signals of each row to be delayed by one clock compared with the control signals of the previous row.
In the display device, the pixel circuit comprises a data module, a driving module, a control module and a light emitting device; the data module is connected with the column control module, the row control module and the driving module; the driving module is connected with the control module, the control module is connected with the negative electrode of the light emitting device and the row control module, and the positive electrode of the light emitting device is connected with a power supply;
the data module is used for writing data signals into the driving module according to the scanning signals in a data writing stage;
the control module is used for being conducted according to the control signal in the display stage;
the driving module is used for driving the light emitting device to light according to the data signal in a display stage.
In the display device, the control module comprises a first switch transistor, a control end of the first switch transistor is connected with the first shift register, an input end of the first switch transistor is connected with a cathode of the light emitting device, and an output end of the first switch transistor is connected with the driving module.
In the display device, the data module comprises a second switch transistor, a control end of the second switch transistor is connected with the second shift register, an input end of the second switch transistor is connected with the column control module, and an output end of the second switch transistor is connected with the driving module.
A pixel circuit comprises a data module, a driving module, a control module and a light emitting device; the data module is connected with the data signal input end and the driving module; the driving module is connected with the control module, the control module is connected with the negative electrode of the light-emitting device and the control signal input end, and the positive electrode of the light-emitting device is connected with a power supply;
the data module is used for writing data signals into the driving module according to the scanning signals in a data writing stage;
the control module is used for conducting according to the control signal in the display stage;
the driving module is used for driving the light emitting device to light according to the data signal in a display stage.
A control method based on the display device described above, comprising the steps of:
The row control module outputs scanning signals to each row of pixel circuits in the display array, and the column control module outputs data signals to each column of pixel circuits in the display array;
The row control module outputs a control signal to each row of the pixel circuits in the display array, and controls the pixel circuits to be lightened according to the data signals in the display stage.
In the method for controlling a display device, the step of outputting a scan signal to each row of the pixel circuits in the display array by the row control module includes:
The first shift register outputs a scanning signal to each row of the pixel circuits in the display array.
In the control method of the display device, the step of outputting a control signal to each row of the pixel circuits in the display array by the row control module and controlling the pixel circuits to be turned on according to the data signal includes: the second shift register outputs a control signal to each row of the pixel circuits to control the pixel circuits to be lightened according to the data signals in a display stage, wherein the control signal of each row is delayed by one clock compared with the control signal of the previous row.
Compared with the prior art, the invention provides a pixel circuit, a display device and a control method thereof, wherein the display device comprises a column control module, a row control module and a display array formed by a plurality of pixel circuits, and the column control module and the row control module are connected with the pixel circuits; the column control module is used for providing data signals for each column of the pixel circuits in the display array; the row control module is used for providing scanning signals and control signals for each row of pixel circuits in the display array, controlling the pixel circuits to write data signals in a data writing stage and lighting up according to the data signals in a display stage; the invention can effectively overcome the limitation of the maximum frequency of the circuit operation components on the frame rate and the gray scale number, and improve the picture display quality.
Drawings
FIG. 1 is a block diagram of a display device according to the present invention;
FIG. 2 is a schematic diagram showing the connection of a first shift register, a second shift register and a pixel circuit in a display device according to the present invention;
FIG. 3 is a timing chart of control signals in the display device according to the present invention;
FIG. 4 is a timing chart of power supply voltage of a power supply in a display device according to the present invention;
FIG. 5 is a schematic circuit diagram of a pixel circuit in a display device according to the present invention;
Fig. 6 is a flowchart illustrating steps of a control method of a display device according to the present invention.
Detailed Description
The invention aims to provide a pixel circuit, a display device and a control method thereof, which can effectively overcome the limitation of the maximum frequency of circuit operation components on the frame rate and the gray scale number and improve the picture display quality.
In order to make the objects, technical solutions and effects of the present invention clearer and more specific, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the display device provided by the present invention includes a column control module 100, a row control module 200, and a display array formed by a plurality of pixel circuits 300, wherein the plurality of pixel circuits form the display array in a matrix array manner, and the column control module 100 and the row control module 200 are connected with the pixel circuits 300; the column control module 100 is configured to provide data signals to the pixel circuits 300 for each column in the display array; the row control module 200 is configured to provide a scan signal and a control signal to each row of the pixel circuits 300 in the display array, control the pixel circuits 300 to write data signals in a data writing stage, and light up according to the data signals in a display stage.
Specifically, when the row control module 200 outputs the scan signal to the pixel circuit 300 and the column control module outputs the data signal to the pixel circuit 300 to scan the data signal, that is, to perform a scan process or an address process, the row control module 200 controls the pixel circuit 300 to be not turned on; compared with the traditional scanning process, once the scanning signal is input, the display state of the corresponding pixel circuit 300 is changed immediately, at this time, the scanning of the used line must be completed within the shortest subfield time, otherwise, the next subfield is disturbed, in the application, the pixel circuit 300 is controlled not to be lightened in the data writing stage, and the pixel module is lightened in the display stage, so that the addressing process, namely the data writing stage and the display stage are independent, and the addressing process will not influence the lightening process, and the addressing process will be more sufficient, the lightening duration can be shorter, namely the shortest subfield length can be shorter, the corresponding frame rate and gray scale number can be higher, and therefore, the limitation of the operating frequency of the circuit operating components on the frame rate and gray scale number can be avoided, and the display quality is improved.
Further, referring to fig. 2, the row control module 200 includes a first shift register 210 and a second shift register 220, and the first shift register 210 and the second shift register 220 are connected to the pixel circuit 300; the first shift register 210 is configured to provide a scan signal to each row of the pixel circuits 300 in the display array, and control the pixel circuits 300 to write the data signal in a data writing stage; the second shift register 220 is configured to provide control signals for each row of the pixel circuits 300, control the pixel circuits 300 to be turned on according to the data signals in the display stage, and control the control signals of each row to be delayed by one clock compared with the control signals of the previous row, so as to reduce the response speed of the power supply of each pixel circuit 300 and reduce the design difficulty of the power supply.
Referring to fig. 3 and fig. 4 together, in this embodiment, taking a display matrix of 5 rows by 3 columns as an example for illustration, the corresponding row control module 200 outputs 5 control signals to the display array, each row of the pixel circuits 300 corresponds to one of the control signals, and the control signals of each row are delayed by one clock compared with the control signals of the previous row, which is equivalent to shifting the level of the current row to the next row by each pulse time of the second shift register 220, wherein the pulse time is consistent with the shortest subfield time length; if the timing of the control signals in each row is the same, the power supply of the pixel circuit 300 must be turned on or completely turned off each time the addressing stage and the display stage are switched, and the state of the power supply must complete abrupt stabilization in a short time, so that the corresponding load needs an adaptive power supply; in this embodiment, by delaying each row of the control signal by one clock compared to the previous row of the control signal by the second shift register 220, the power supply does not need to change greatly in a short time, and there is a slow transition time from the minimum voltage value to the maximum voltage value, the slow transition time is the shortest subfield length with the shortest time length multiplied by the total number of rows, and in order to use the shift register, the addressing time, i.e. the low level time of the control signal should be an integer multiple of the shortest subfield time, wherein the addressing time of each subfield is the same; therefore, the timing sequence of the control signal in the embodiment ensures that the power supply does not need to bear great load transformation in the moment, and correspondingly, the power supply with high-speed load variation is not required to be adapted, thereby reducing the design difficulty of the power supply.
Further, referring to fig. 5, the pixel circuit 300 includes a data module 310, a driving module 320, a control module 330, and a light emitting device L1; the data module 310 connects the column control module 100, the row control module 200, and the driving module 320; the driving module 320 is connected to the control module 330, the control module 330 is connected to the negative electrode of the light emitting device L1 and the row control module 200, and the positive electrode of the light emitting device L1 is connected to the power supply.
The data module 310 is configured to write a data signal to the driving module 320 according to the scan signal in a data writing stage; the control module 330 is configured to be turned on according to the control signal during the display stage; the driving module 320 is configured to drive the light emitting device L1 to light according to the data signal in the display stage, specifically, the row control module 200 outputs a control signal to control the control module 330 to be turned off in the data writing stage, that is, the addressing stage, when the power supply cannot form a path through the light emitting device L1 to the driving module 320, and the light emitting device L1 is not lit; in the display stage, the row control module 200 outputs a control signal to control the control module 330 to be turned on, and at this time, the driving module 320 completes writing of a data signal and turns on, so that the power supply is connected to the control module 330 through the light emitting device L1, and then connected to a channel through the driving module 320, and the light emitting device L1 is turned on; the control module 330 is turned on when the control signal is a high level signal and turned off when the control signal is a low level signal; in this embodiment, by adding the control module 330 in the pixel circuit 300 and combining the control signal output by the second shift register 220, the pixel circuit 300 disconnects the control module 330 in the addressing process, that is, in the data signal writing stage, so that the addressing process does not affect the display process, thereby fully performing the addressing process, realizing shorter lighting time, and further realizing shorter shortest subfield length, so as to improve the frame rate and the gray scale number, and improve the display quality; meanwhile, the control time sequence is changed, so that the power supply does not need to bear great complex change instantaneously, and the difficulty of power supply design is reduced.
In a specific implementation, the control module 330 includes a first switching transistor Q1, a control end of the first switching transistor Q1 is connected to the first shift register 210, an input end of the first switching transistor Q1 is connected to a negative electrode of the light emitting device L1, an output end of the first switching transistor Q1 is connected to the driving module 320, in this embodiment, the first switching transistor Q1 is an N-type transistor, and is triggered to be turned on by a high-level signal, so as to control the light emitting device L1 to be not turned on in an addressing process and turned on in a display process, so that the pixel circuit 300 is conveniently implemented without affecting a display process in the addressing process, and the limitation of a maximum frequency of circuit operating elements on a frame rate and a gray scale number is overcome.
Further, the data module 310 includes a second switching transistor Q2, a control end of the second switching transistor Q2 is connected to the second shift register 220, an input end of the second switching transistor Q2 is connected to the column control module 100, an output end of the second switching transistor Q2 is connected to the driving module 320, when the control end of the second switching transistor Q2 receives a scan signal, the corresponding column control module 100 is turned on, and writes a data signal to the driving module 320 through the second switching transistor Q2, so as to facilitate the subsequent driving of the light emitting device L1 to light up.
Further, the driving module 320 includes a driving transistor D1, a control terminal of the driving transistor D1 is connected to an output terminal of the second switching transistor Q2, an input terminal of the driving transistor D1 is connected to the control module 330, an output terminal of the driving transistor D1 is grounded, and the driving transistor D1 is turned on according to the data signal so as to drive the light emitting device L1 to light in a display stage.
The invention also correspondingly provides a pixel circuit which comprises a data module, a driving module, a control module and a light emitting device; the data module is connected with the data signal input end and the driving module; the driving module is connected with the control module, the control module is connected with the negative electrode of the light-emitting device and the control signal input end, and the positive electrode of the light-emitting device is connected with a power supply; the data module is used for writing data signals into the driving module according to the scanning signals in a data writing stage; the control module is used for conducting according to the control signal in the display stage; the driving module is used for driving the light emitting device to light according to the data signal in the display stage, and the control module is additionally arranged to control the light emitting device not to light in the data writing stage, that is, the light emitting device does not change state immediately due to the input of the scanning signal, and the pixel circuit is described in detail and will not be repeated here.
Based on the display device, the invention further provides a control method of the display device, as shown in fig. 6, the control method comprises the following steps:
S100, a row control module outputs scanning signals to each row of pixel circuits in a display array, and a column control module outputs data signals to each column of pixel circuits in the display array;
and S200, the row control module outputs a control signal to each row of pixel circuits in the display array, and the pixel circuits are controlled to be lightened according to the data signals in the display stage.
Further, the step of the row control module outputting a control signal to each row of the pixel circuits in the display array includes: the first shift register outputs a scanning signal to each row of the pixel circuits in the display array.
Further, step S200 includes: the second shift register outputs a control signal to each row of the pixel circuits to control the pixel circuits to be lightened according to the data signals in a display stage, wherein the control signal of each row is delayed by one clock compared with the control signal of the previous row.
In summary, the invention provides a pixel circuit, a display device and a control method thereof, wherein the display device comprises a column control module, a row control module and a display array formed by a plurality of pixel circuits, and the column control module and the row control module are connected with the pixel circuits; the column control module is used for providing data signals for each column of the pixel circuits in the display array; the row control module is used for providing scanning signals and control signals for each row of pixel circuits in the display array, controlling the pixel circuits to write data signals in a data writing stage and lighting up according to the data signals in a display stage; the invention can effectively overcome the limitation of the maximum frequency of the circuit operation components on the frame rate and the gray scale number, and improve the picture display quality.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (5)
1. The display device is characterized by comprising a column control module, a row control module and a display array formed by a plurality of pixel circuits, wherein the column control module and the row control module are connected with the pixel circuits; the column control module is used for providing data signals for each column of the pixel circuits in the display array; the row control module is used for providing scanning signals and control signals for each row of pixel circuits in the display array, controlling the pixel circuits to write data signals in a data writing stage and lighting up according to the data signals in a display stage; a plurality of pixel circuits form a display array in a matrix array mode;
the row control module comprises a first shift register and a second shift register, and the first shift register and the second shift register are connected with the pixel circuit;
The first shift register is used for providing scanning signals for each row of pixel circuits in the display array and controlling the pixel circuits to write the data signals in a data writing stage; the second shift register is used for respectively providing control signals for each row of pixel circuits, controlling the pixel circuits to be lightened according to the data signals in a display stage, and controlling the control signals of each row to be delayed by one clock compared with the control signals of the previous row;
the pulse time of the second shift register is consistent with the time length of the shortest sub-field; the low level time of the control signal is an integer multiple of the shortest subfield time, wherein the low level time of each of the control signals is the same.
2. The display device according to claim 1, wherein the pixel circuit includes a data module, a driving module, a control module, and a light emitting device; the data module is connected with the column control module, the row control module and the driving module; the driving module is connected with the control module, the control module is connected with the negative electrode of the light-emitting device and the row control module, and the positive electrode of the light-emitting device is connected with a power supply;
the data module is used for writing data signals into the driving module according to the scanning signals in a data writing stage;
the control module is used for being conducted according to the control signal in the display stage;
the driving module is used for driving the light emitting device to light according to the data signal in a display stage.
3. The display device according to claim 2, wherein the control module includes a first switching transistor, a control terminal of the first switching transistor is connected to the first shift register, an input terminal of the first switching transistor is connected to a negative electrode of the light emitting device, and an output terminal of the first switching transistor is connected to the driving module.
4. The display device according to claim 2, wherein the data module comprises a second switching transistor, a control terminal of the second switching transistor is connected to the second shift register, an input terminal of the second switching transistor is connected to the column control module, and an output terminal of the second switching transistor is connected to the driving module.
5. A control method based on the display device according to claim 1, characterized by comprising the steps of:
The row control module outputs scanning signals to each row of pixel circuits in the display array, and the column control module outputs data signals to each column of pixel circuits in the display array;
a first shift register outputs a scanning signal to each row of the pixel circuits in the display array;
the row control module outputs a control signal to each row of the pixel circuits in the display array, and controls the pixel circuits to be lightened according to the data signals in a display stage;
the second shift register outputs a control signal to each row of the pixel circuits to control the pixel circuits to be lightened according to the data signals in a display stage, wherein the control signal of each row is delayed by one clock compared with the control signal of the previous row.
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| CN202010704897.1A CN113963647B (en) | 2020-07-21 | 2020-07-21 | Pixel circuit, display device and control method thereof |
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