CN108510953B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN108510953B CN108510953B CN201810343635.XA CN201810343635A CN108510953B CN 108510953 B CN108510953 B CN 108510953B CN 201810343635 A CN201810343635 A CN 201810343635A CN 108510953 B CN108510953 B CN 108510953B
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- Crystallography & Structural Chemistry (AREA)
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the invention provides a display panel and a display device, relates to the technical field of display, and aims to reduce the space occupied by an output signal line of a pressure sensing sensor so as to be beneficial to implementation of a narrow frame. The display panel includes: a first scan driving circuit electrically connected to each scan line; a plurality of pressure sensitive sensors; a bias voltage signal line; the first end of the switch unit is electrically connected to the corresponding pressure sensing sensor, the second end of the switch unit is electrically connected to the bias voltage signal wire, and the control end of the switch unit is used for controlling the connection and disconnection of the first end and the second end; the second scanning driving circuit is electrically connected to the control end of each switch unit and used for providing scanning signals for the control ends of the switch units; and the clock signal line is connected with the first scanning driving circuit and the second scanning driving circuit.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a display device.
Background
In order to realize more various and flexible man-machine interaction modes, the current touch display panel can detect the size of pressing pressure on the panel besides the touch position. The pressure magnitude of pressing on the detection panel can be realized through adopting the forced induction sensor of wheatstone bridge principle, and under ideal state, the output signal of forced induction sensor is 0V, and when applying pressure to the panel, the panel takes place deformation, and the resistance of forced induction sensor changes, and the signal value that forced induction sensor output and panel deformation degree are relevant.
The current display panel generally includes a plurality of pressure-sensitive sensors sharing two output signal lines, but two output signal lines need to be separately provided for each pressure-sensitive sensor, that is, 2N +2 signal lines are required for N pressure-sensitive sensors. Therefore, the signal lines required by the pressure sensor occupy a larger frame space, which is not beneficial to the realization of a narrow frame.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which can reduce the space occupied by an output signal line of a pressure sensing sensor so as to be beneficial to the realization of a narrow frame.
In one aspect, an embodiment of the present invention provides a display panel, including:
a plurality of sub-pixels distributed in an array;
a scan line corresponding to each row of the sub-pixels;
a first scan driving circuit electrically connected to each of the scan lines, the first scan driving circuit being configured to provide scan signals to a plurality of the scan lines;
a plurality of pressure sensitive sensors;
a bias voltage signal line;
the first end of each switch unit is electrically connected to the corresponding pressure sensing sensor, the second end of each switch unit is electrically connected to the bias voltage signal line, and the control end of each switch unit is used for controlling the connection and disconnection of the first end and the second end;
the second scanning driving circuit is electrically connected to the control end of each switch unit and is used for providing scanning signals for the control ends of the switch units;
and the clock signal line is connected with the first scanning driving circuit and the second scanning driving circuit.
On the other hand, an embodiment of the present invention further provides a display device, including the display panel.
According to the display panel and the display device, the charging control of the sub-pixels is realized through the first scanning driving circuit, the driving control of the pressure sensing sensors is realized through the second scanning driving circuit, so that the pressure sensing sensors work at different moments, the pressure sensing sensors can multiplex the same output signal lines in a time-sharing mode, and the output signal lines do not need to be independently arranged for each pressure sensing sensor, so that the space occupied by the pressure sensing sensors is reduced, and the narrow frame is favorably realized; meanwhile, the first scanning driving circuit and the second scanning driving circuit share a clock signal line, and an independent clock signal line does not need to be arranged for the second scanning driving circuit independently, so that the number of wires in the panel is further reduced, and the realization of a narrow frame is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a connection of the pressure sensor of FIG. 1;
FIG. 3 is a schematic view of another connection of the pressure sensor of FIG. 1;
FIG. 4 is a schematic view of another connection of the pressure sensor of FIG. 1;
FIG. 5 is a timing diagram of FIG. 3;
FIG. 6 is another timing signal diagram of FIG. 3;
FIG. 7 is a schematic structural diagram of a pressure-sensitive sensor in an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another pressure-sensitive sensor in accordance with an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
As shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a display panel in an embodiment of the present invention, and fig. 2 is a schematic connection diagram of a pressure sensor in fig. 1, an embodiment of the present invention provides a display panel, including: a plurality of sub-pixels 10 distributed in an array; a scanning line 11 corresponding to each row of sub-pixels, and a data line 12 corresponding to each column of sub-pixels 10, namely, a plurality of sub-pixels 10 are defined by a plurality of scanning lines 11 and a plurality of data lines 12 in a crossed insulation manner; a first scan driving circuit 21 electrically connected to each scan line 11, wherein the first scan driving circuit 21 is used for providing scan signals to the plurality of scan lines 11, so that each row of sub-pixels 10 is charged row by row under the control of the scan lines 11; a plurality of pressure-sensitive sensors 3; a bias voltage signal line 4; the switch unit 5 corresponds to each pressure sensing sensor 3, a first end of each switch unit 5 is electrically connected to the corresponding pressure sensing sensor 3, a second end of each switch unit 5 is electrically connected to the bias voltage signal line 4, and a control end of each switch unit 5 is used for controlling the connection and disconnection of the first end and the second end; a second scan driving circuit 22 electrically connected to the control terminal of each switch unit 5, the second scan driving circuit 22 being configured to provide scan signals to the control terminals of the plurality of switch units 5; the clock signal line 6, the clock signal line 6 is connected to the first scan driver circuit 21 and the second scan driver circuit 22.
Specifically, during the operation of the display panel, the clock signal line 6 provides clock signals to the first scan driving circuit 21 and the second scan driving circuit 22 at the same time, so that the first scan driving circuit 21 and the second scan driving circuit 22 respectively realize the scan driving function under the control of the clock signal line 6. Wherein, the first scan driving circuit 21 is used to provide a scan signal for the scan line 11, for example, in a liquid crystal display panel, each sub-pixel 10 is correspondingly provided with a pixel electrode 7 and a display thin film transistor 8, a first end of the display thin film transistor 8 is connected to a corresponding data line 12, a second end of the display thin film transistor 8 is connected to a corresponding pixel electrode 7, a control end of the display thin film transistor 8 is connected to a corresponding scan line 11, when the scan line 11 is at a conducting level, the display thin film transistor 8 connected to the scan line 11 is conducting, a data signal on the data line 12 is transmitted to the corresponding pixel electrode 7 through the corresponding display thin film transistor 8 to realize charging the sub-pixel 10, so that the pixel electrode 7 is charged to a required voltage, the liquid crystal display panel further includes a common electrode and liquid crystal, the liquid crystal is deflected to a corresponding angle under the control of an electric field between the pixel electrode 7 and the common electrode, so as to control the corresponding sub-pixel 10 to have the corresponding display gray scale, thereby realizing the normal display function. The second scanning driving circuit 22 is configured to provide scanning signals for the control end of each switch unit 5 to control each switch unit 5 to be turned on at different times, and the switch units 5 are connected in series between the pressure-sensitive sensors 3 and the bias voltage signal line 4, that is, the second scanning driving circuit 22 controls the bias voltage signal line 4 to provide bias voltage signals for the unused pressure-sensitive sensors 3 at different times respectively to drive the pressure-sensitive sensors 3 to operate at different times, so that the output ends of the pressure-sensitive sensors 3 can be connected to the same output signal line, so that the driving chip can obtain output signals of different pressure-sensitive sensors 3 at different times to achieve a pressure detection function.
In the display panel in the embodiment of the invention, the charging control of the sub-pixels is realized through the first scanning drive circuit, and the driving control of the pressure sensing sensors is realized through the second scanning drive circuit, so that the pressure sensing sensors work at different moments, the pressure sensing sensors can multiplex the same output signal lines in a time-sharing manner, and the output signal lines do not need to be independently arranged for each pressure sensing sensor, thereby reducing the space occupied by the pressure sensing sensors and being beneficial to the realization of a narrow frame; meanwhile, the first scanning driving circuit and the second scanning driving circuit share a clock signal line, and an independent clock signal line does not need to be arranged for the second scanning driving circuit independently, so that the number of wires in the panel is further reduced, and the realization of a narrow frame is facilitated.
Alternatively, as shown in fig. 3, fig. 3 is another schematic diagram of the connection relationship of the pressure sensing sensor in fig. 1, the first scan driving circuit 21 includes a plurality of cascaded first shift registers 210, and the output end OUT of each first shift register 210 is electrically connected to each scan line 11 in a one-to-one correspondence; the second scan driving circuit 22 includes a plurality of cascaded second shift registers 220, and the output terminal OUT of each second shift register 220 is electrically connected to the control terminal of each switch unit 5 in a one-to-one correspondence.
Specifically, for example, there are n scan lines 11 including the first scan line 111, the second scan line 112, the third scan line 113, …, and the nth scan line 11n, each shift register usually needs to be controlled by a plurality of different clock signals, for example, there are n first shift registers 210 including a first stage first shift register 211, a second stage first shift register 212, a third stage first shift register 213, …, and an nth stage first shift register 21n, each first shift register 210 includes a first clock signal terminal CK and a second clock signal terminal XCK, the clock signal line 6 includes a first clock signal line S1 and a second clock signal line S2, the first clock signal line S1 connects the first clock signal terminal of the odd stage first shift register 210 and the second clock signal terminal XCK of the even stage first shift register 210, and the second clock signal line S2 connects the second clock signal terminal XCK of the odd stage first shift register 210 and the first clock signal terminal XCK of the even stage first shift register 210 The first clock signal terminal CK of the register 210, except for the last stage of the first shift register 21n, has an output terminal OUT of each stage of the first shift register 210 connected to an input terminal IN of the next stage of the shift register 210 (for example, the output terminal OUT of the first stage of the first shift register 211 is connected to the input terminal IN of the second stage of the first shift register 212). Taking the structure shown in fig. 3 as an example, the number of the pressure-sensitive sensors 3 is three, but the embodiment of the present invention is not limited to the number of the pressure-sensitive sensors 3, the output terminal OUT of the first-stage second shift register 220 is connected to the control terminal of the switch unit 5 corresponding to the first pressure-sensitive sensor 3 through a first output control line TC1, the output terminal OUT of the second-stage second shift register 220 is connected to the control terminal of the switch unit 5 corresponding to the second pressure-sensitive sensor 3 through a second output control line TC2, and the output terminal OUT of the third-stage second shift register 220 is connected to the control terminal of the switch unit 5 corresponding to the third pressure-sensitive sensor 3 through a third output control line TC 3. Each of the second shift registers 220 also includes a first clock signal terminal CK and a second clock signal terminal XCK, the first clock signal line S1 connects the first clock signal terminal CK of the odd-numbered second shift register 220 and the second clock signal terminal XCK of the even-numbered second shift register 220, the second clock signal line S2 connects the second clock signal terminal XCK of the odd-numbered second shift register 220 and the first clock signal terminal CK of the even-numbered second shift register 220, each of the second shift registers 220 further includes a cascade signal terminal NEX, and the cascade signal terminal NEX of each of the second shift registers 220 is connected to the input terminal IN of the next second shift register 220 except for the last second shift register 220. IN the first scan driving circuit 21, the output signal of each stage of the first shift register 210 is provided to the corresponding scan line 11 for controlling the on/off of the display tft, and is also provided to the input terminal IN of the next stage of the first shift register 210, so that the next stage of the first shift register 210 generates the output signal of the current stage of the first shift register 210 IN response to the output signal of the previous stage of the first shift register 210, so as to implement the scan control function of the whole first scan driving circuit 21; similarly, in the second scan driving circuit 22, each stage of the second shift register 220, except for the first stage of the second shift register 220, generates the output signal of the second shift register 220 in response to the signal output from the cascade signal terminal NEX of the second shift register 220 of the previous stage to realize the scan control function of the entire second scan driving circuit 22. It should be noted that, IN the structure shown IN fig. 3, the cascade connection between the first shift registers 210 IN the first scan driving circuit 21 is implemented by connecting the output terminal OUT of the first shift register 210 of this stage with the input terminal IN of the first shift register 210 of the next stage, and the cascade connection between the second shift registers 220 IN the second scan driving circuit 22 is implemented by connecting the cascade signal terminal NEX of the second shift register 220 of this stage with the input terminal IN of the second shift register 220 of the next stage, however, it is understood that the cascade connection is only an example, the cascade connection of the shift registers of the present embodiment of the present invention is not limited, for example, the first shift register of each stage can also be implemented by connecting the cascade signal terminal of the shift register of this stage with the input terminal of the shift register of the next stage, and the second shift register can also be implemented by connecting the output terminal of the shift register of this stage with the input terminal of the shift register of the next stage, the signal generated by the shift register of the current stage can be used as the input signal of the shift register of the next stage by a cascade connection mode.
Alternatively, as shown in fig. 3, each of the first shift registers 210 and each of the second shift registers 220 includes a reset signal terminal RE; the display panel further includes a reset signal line S3, and the reset signal line S3 is electrically connected to the reset signal terminal RE of each of the first shift registers 210 and each of the second shift registers 220.
Specifically, since the shift registers in the first scan driver circuit 21 and the second scan driver circuit 22 are connected to the same reset signal line S3, the number of signal lines can be further reduced, which is advantageous for implementing a narrow bezel.
Alternatively, as shown in fig. 3, each pressure-sensitive sensor 3 includes a first output terminal OUT1 and a second output terminal OUT 2; the display panel further includes a first output signal line OL1 and a second output signal line OL2, the first output signal line OL1 being electrically connected to the first output terminal OUT1 of each pressure-sensitive sensor 3, the second output signal line OL2 being electrically connected to the second output terminal OUT2 of each pressure-sensitive sensor 3.
Alternatively, as shown IN fig. 3, each pressure-sensitive sensor 3 comprises a first input IN1 and a second input IN 2; the bias voltage signal line 4 includes a first bias voltage signal line IL1 and a second bias voltage signal line IL 2; each switch unit 5 includes a first thin film transistor T1, a first end of the first thin film transistor T1 is electrically connected to the first input terminal IN1 of the corresponding pressure-sensitive sensor 3, a second end of the first thin film transistor T1 is electrically connected to the first bias voltage signal line IL1, and a control end of the first thin film transistor T1 is electrically connected to the second scan driving circuit 22; a second bias voltage signal line IL2 is electrically connected to the second input terminal IN2 of each pressure sensitive sensor 3.
Specifically, the pressure-sensitive sensor 3 includes two input terminals, when the two input terminals are respectively connected to the first bias voltage signal line IL1 and the second bias voltage signal line IL2, the current generated by the bias voltage can flow through the pressure-sensitive sensor 3, and the pressure-sensitive sensor 3 can be driven to operate, and if one of the input terminals is not connected to the corresponding bias voltage signal line, the pressure-sensitive sensor 3 cannot operate, so as shown IN fig. 3, only the first input terminal IN1 of the pressure-sensitive sensor 3 can be connected to the first bias voltage signal line IL1 through the first thin-film transistor T1, and whether the corresponding pressure-sensitive sensor 3 operates can be controlled by turning on and off the first thin-film transistor T1.
Optionally, the second bias voltage signal line IL2 is electrically connected to ground.
In particular, this may be accomplished without separately providing a separate signal output for the second bias voltage signal line IL2 to provide the bias voltage for the pressure sensitive sensor 3.
Alternatively, as shown IN fig. 4, fig. 4 is a schematic diagram of another connection relationship of the pressure-sensitive sensors IN fig. 1, each switch unit 5 further includes a second thin-film transistor T2, a first end of the second thin-film transistor T2 is electrically connected to the first input terminal IN1 of the corresponding pressure-sensitive sensor 3, a second end of the second thin-film transistor T2 is electrically connected to the ground terminal GND, and a control terminal of the second thin-film transistor T2 is electrically connected to the control terminal of the corresponding first thin-film transistor T1; the first thin film transistor T1 and the second thin film transistor T2 are transistors of opposite control types.
Specifically, for example, the first thin film transistor T1 is an N-type transistor, and the second thin film transistor T2 is a P-type transistor; alternatively, the first thin film transistor T1 is a P-type transistor, and the second thin film transistor T2 is an N-bit transistor. In each of the switching units 5, the first thin film transistor T1 and the second thin film transistor T2 are always in opposite states during operation of the display panel, and the second thin film transistor T2 is turned off when the first thin film transistor T1 is turned on, and the second thin film transistor T2 is turned on when the first thin film transistor T1 is turned off. That is, when the pressure sensor 3 works, the second thin film transistor T2 corresponding to the pressure sensor 3 is turned off, so as to prevent the ground GND from being connected to the first input terminal IN1 of the pressure sensor 3; when the pressure sensor 3 does not work, the second thin film transistor T2 corresponding to the pressure sensor 3 is turned on, and at this time, the ground terminal GND is turned on with the first input terminal IN1 of the pressure sensor 3, and when static electricity is received on the first output signal line OL1, the static electricity can be timely transmitted to the ground terminal GND through the second thin film transistor T2 to realize static electricity discharge, so that the probability that the pressure sensor 3 is broken down due to the static electricity passing through the pressure sensor 3 is reduced.
Alternatively, as shown in fig. 3 and 5, fig. 5 is a timing signal diagram of fig. 3, and the display panel further includes: and a driving chip (not shown) electrically connected to the first scan driving circuit 21 and the second scan driving circuit 22, wherein the driving chip is used for controlling the first scan driving circuit 21 to control the second scan driving circuit 22 to scan after completing the scanning in each frame.
Specifically, for example, the driving chip includes a first start signal terminal STV1 and a second start signal terminal STV2, the input terminal IN of the first stage first shift register 210 IN the first scan driving circuit 21 is connected to the first start signal terminal STV1, and the input terminal IN of the first stage second shift register 220 IN the second scan driving circuit 22 is connected to the second start signal terminal STV 2. The first clock signal line S1 and the second clock signal line S2 output different clock signals, respectively, during each frame time. In the preparation phase t00 of each frame, the reset signal line S3 provides an enable level to control the first shift registers 210 and the second shift registers 220 to be reset, in the initial phase t0 of each frame, the first initial signal terminal STV1 provides an enable level, the first stage first shift register 210 shifts in response to the enable level of the first initial signal terminal STV1, outputs the enable level in the first phase t1 to realize the charging of the first row sub-pixels 10, the second stage first shift register 210 outputs the enable level in response to the enable level output by the first stage first shift register 210, outputs the enable level in the second phase t2 to realize the charging of the second row sub-pixels 10, and so on, until the nth stage first shift register 210 outputs the enable level in the nth phase tn to realize the charging of the nth row sub-pixels 10, at this time, the display function is completed, and then the n +1 phase tn +1 is entered, the second initial signal terminal STV2 outputs an enable level, the first stage second shift register 220 outputs the enable level to the first output control line TC1 in the n +2 th stage tn +2 in response to the enable level of the second initial signal terminal STV2 to control the corresponding first pressure sensing sensor 3 to operate, the second stage second shift register 220 shifts in response to the signal output from the cascade signal terminal NEX of the first stage second shift register 220, outputs the enable level to the second output control line TC2 in the n +3 th stage tn +3 to control the corresponding second pressure sensing sensor 3 to operate, the third stage second shift register 220 shifts in response to the signal output from the cascade signal terminal NEX of the second stage second shift register 220, outputs the enable level to the third output control line TC3 in the n +4 th stage tn +4 to control the corresponding third pressure sensing sensor 3 to operate, that is, it is realized to control the first scan driving circuit 21 to control the second scan driving circuit 22 to perform scanning after completion of scanning.
It should be noted that, when the structure shown IN fig. 3 is matched with the timing signal corresponding to fig. 5, IN addition to the way of connecting the input terminal IN of the first-stage second shift register 220 to the driver chip, the input terminal IN of the first-stage second shift register 220 may be connected to the output terminal of the nth-stage (last-stage) first shift register 210, even if the last-stage first shift register 210 and the first-stage second shift register 220 are cascaded, the pressure detection by driving each pressure-sensitive sensor 3 through the second scan driving circuit 22 after the display panel is driven by the first scan driving circuit 21 to complete charging can also be realized. After the first scan driving circuit 21 finishes scanning, the second scan driving circuit 22 is controlled to scan, so that the first shift register 210 in the first scan driving circuit 21 and the second shift register 220 in the second scan driving circuit 22 can be prevented from outputting the on level at the same time, that is, only one shift register can be in the state of outputting the on level at any time, and thus, the loads of the clock signal lines 6 at any time are the same, and uneven display caused by different loads of the clock signal lines 6 at different times is avoided.
Alternatively, as shown in fig. 3 and fig. 6, fig. 6 is another timing signal diagram in fig. 3, and the display panel further includes: and a driving chip (not shown) electrically connected to the first scan driving circuit 21 and the second scan driving circuit 22, wherein the driving chip is used for controlling the first scan driving circuit 21 to scan and the second scan driving circuit 22 to scan in each frame.
Specifically, for example, the driving chip includes a first start signal terminal STV1 and a second start signal terminal STV2, the input terminal IN of the first stage first shift register 210 IN the first scan driving circuit 21 is connected to the first start signal terminal STV1, and the input terminal IN of the first stage second shift register 220 IN the second scan driving circuit 22 is connected to the second start signal terminal STV 2. The first clock signal line S1 and the second clock signal line S2 output different clock signals, respectively, during each frame time. The reset signal line S3 provides an enable level to control the first shift registers 210 and the second shift registers 220 to be reset at the preparation stage t00 of each frame, the first initialization signal terminal STV1 and the second initialization signal terminal STV2 simultaneously provide an enable level at the initialization stage t0 of each frame, the first stage first shift register 210 shifts in response to the enable level of the first initialization signal terminal STV1 to output an enable level at the first stage t1 to charge the first row subpixels 10, the first stage second shift register 220 shifts in response to the enable level of the second initialization signal terminal STV2 to output an enable level to the first output control line TC1 at the first stage t1 to control the corresponding first pressure-sensitive sensor 3 to operate, the second stage first shift register 210 outputs an enable level at the second stage t2 in response to the enable level output from the first stage first shift register 210, the charging of the sub-pixels 10 in the second row is realized, the second-stage second shift register 220 shifts in response to the signal output from the cascade signal terminal NEX of the first-stage second shift register 220, and outputs the enable level to the second output control line TC2 in the second stage t2, so as to control the corresponding second pressure sensor 3 to operate, and so on, that is, the first scan driving circuit 21 is controlled to scan and the second scan driving circuit 22 is controlled to scan at the same time in each frame. In this driving method, the charging process and the pressure detection process of the sub-pixels are performed simultaneously, so that the refresh rate of the display can be increased.
It should be noted that, when the structure shown in fig. 3 is matched with the timing signals corresponding to fig. 6, the first initial signal terminal STV1 and the second initial signal terminal STV2 of the driver chip may be the same port, because the signals output by the two terminals are the same. In addition, the specific implementation of controlling the first scan driving circuit 21 to scan and the second scan driving circuit 22 to scan is many, and the timing shown in fig. 6 is only an example, and for example, the second scan driving circuit 22 may be controlled to drive the pressure-sensitive sensors 3 to detect pressure while the second row of sub-pixels 10 are charged.
Alternatively, referring to fig. 3 and 5, the display panel further includes: and a driving chip (not shown) electrically connected to the first scan driving circuit 21 and the second scan driving circuit 22, the driving chip being configured to control the second scan driving circuit 22 to scan at a first frequency by controlling the frequency of the second start signal terminal STV2 in response to a standby command, and the driving chip being further configured to control the second scan driving circuit 22 to scan at a second frequency by controlling the frequency of the second start signal terminal STV2 when the pressure sensing signal reaches a preset condition, wherein the first frequency is lower than the second frequency.
Specifically, when the display panel is used in a terminal such as a mobile phone, the display panel has a long standby time, and accurate pressure detection is not required in the standby time, so that the second scanning driving circuit 22 can be controlled to scan at a low frequency, for example, twice per second, when it is determined that the pressure sensing signal output by the pressure sensing sensor 3 reaches a preset condition, it indicates that the user is performing a pressing operation, and at this time, the scanning frequency of the second scanning driving circuit 22 is increased, so as to achieve more accurate pressure detection. Thus, power consumption can be saved, heat generation of the pressure-sensitive sensor 3 can be reduced, and the life of the pressure-sensitive sensor 3 can be prolonged.
Alternatively, referring to fig. 3 and 5, the first scan driving circuit 21 includes a plurality of cascaded first shift registers 210, the output end OUT of each first shift register 210 is electrically connected to each scan line 11 IN a one-to-one correspondence, and the input end IN of the first shift register 210 of the first stage is electrically connected to a driving chip (not shown IN the figure); the second scan driving circuit 22 includes a plurality of cascaded second shift registers 220, an output end OUT of each second shift register 220 is electrically connected to a control end of each switch unit 5 IN a one-to-one correspondence manner, and an input end IN of the first-stage second shift register 220 is electrically connected to a driving chip; the driving chip controls the scan period of the first scan driving circuit 21 by controlling the frequency of the first initial signal terminal STV1 of the input terminal IN of the first stage first shift register 210, and the driving chip controls the scan period of the second scan driving circuit 22 by controlling the frequency of the first initial signal terminal STV1 of the input terminal IN of the first stage second shift register 220. The first frequency and the second frequency can be controlled by controlling the scanning period of the first scanning driving circuit 21 and the scanning period of the second scanning driving circuit 22.
Alternatively, as shown IN fig. 7, fig. 7 is a schematic structural diagram of a pressure-sensitive sensor IN an embodiment of the present invention, where the pressure-sensitive sensor is a wheatstone bridge type pressure sensor, the wheatstone bridge type pressure sensor includes a first input terminal IN1, a second input terminal IN2, a first output terminal OUT1 and a second output terminal OUT2, a first voltage-variable resistor R1 is connected IN series between the second output terminal OUT2 and the first input terminal IN1, a second voltage-variable resistor R2 is connected IN series between the first input terminal IN1 and the first output terminal OUT1, a third voltage-variable resistor R3 is connected IN series between the first output terminal OUT1 and the second input terminal IN2, and a fourth voltage-variable resistor R4 is connected IN series between the second input terminal IN2 and the second output terminal OUT 3.
Specifically, the shapes of the first voltage-variable resistor R1, the second voltage-variable resistor R2, the third voltage-variable resistor R3 and the fourth voltage-variable resistor R4 may be various, and for example, as shown in fig. 8, the pressure-sensitive sensor includes a first extending direction h1 and a second extending direction h2, the first extending direction h1 and the second extending direction h2 are arranged to intersect, a component of an extending length of the first voltage-variable resistor R1 from the first end a to the second end a 'in the first extending direction h1 is larger than a component in the second extending direction h2, a component of an extending length of the second voltage-variable resistor R2 from the first end b to the second end b' in the second extending direction h2 is larger than a component in the first extending direction h1, a component of an extending length of the third voltage-variable resistor R632 from the first end c to the second end c 'in the first extending direction h 8 is larger than a component in the second extending direction h2, and a component of an extending length of the fourth voltage-variable resistor R638 d from the first end c' to the second extending direction h2 A component in the first extension direction h 1. The arrangement can not only enable the first voltage-variable resistor R1 and the third voltage-variable resistor R3 to sense the strain of the first extending direction h1, but also enable the second voltage-variable resistor R2 and the fourth voltage-variable resistor R4 to sense the strain of the second extending direction h2, and the area of the whole pressure sensing sensor is small, and the influence of temperature is small. When the display panel is not subjected to compressive stress perpendicular to the plane of the display panel, when the ratio of the resistance values of the first voltage-variable resistor R1 and the second voltage-variable resistor R2 is equal to the ratio of the resistance values of the fourth voltage-variable resistor R4 and the third voltage-variable resistor R3, the bridge reaches an equilibrium state, and the voltage value at the first output end OUT1 is equal to the voltage value at the second output end OUT 2; when the display panel is subjected to a compressive stress perpendicular to the plane of the display panel, the four resistors deform to cause the resistance values of the resistors to change, so that the bridge breaks the balance state, that is, the ratio of the resistance values of the first voltage-variable resistor R1 to the resistance value of the second voltage-variable resistor R2 is not equal to the ratio of the resistance values of the fourth voltage-variable resistor R4 to the resistance value of the third voltage-variable resistor R3, the voltage value of the first output end OUT1 is not equal to the voltage value of the second output end OUT2, the difference between the voltage value of the first output end OUT1 and the voltage value of the second output end OUT2 has a corresponding relationship with the pressure value applied to the display panel, and in the pressure detection process, the corresponding pressure value can be obtained by obtaining the voltage value of the first output end OUT1 and the voltage value of the second output end OUT 2.
Alternatively, as shown in fig. 8, fig. 8 is a schematic structural diagram of another pressure-sensitive sensor in the embodiment of the present invention, and the pressure-sensitive sensor 3 is a silicon piezoresistive pressure sensor.
Specifically, the silicon piezoresistive pressure sensor may have a quadrilateral structure, four sides of the sensor are respectively connected with the first input terminal IN1, the second input terminal IN2, the first output terminal OUT1 and the second output terminal OUT2, the first input terminal IN1 and the second input terminal IN2 are respectively connected to two opposite sides, and the first output terminal OUT1 and the second output terminal OUT2 are respectively connected to the other two opposite sides. The first input terminal IN1 and the second input terminal IN2 apply bias voltage to the silicon piezoresistive pressure sensor, when the display panel is subjected to compressive stress perpendicular to the plane of the display panel, the resistance value of the silicon piezoresistive pressure sensor changes, output signals of the first output terminal OUT1 and the second output terminal OUT2 change correspondingly, and the pressure applied to the silicon piezoresistive pressure sensor is detected through the change of the voltage on the first output terminal OUT1 and the second output terminal OUT 2.
As shown in fig. 9, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, and the embodiment of the present invention further provides a display device including the display panel 100.
The specific structure and principle of the display panel 100 are the same as those of the above embodiments, and are not described herein again. The display device may be any electronic device with a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, an electronic paper book, or a television.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A display panel, comprising:
a plurality of sub-pixels distributed in an array;
a scan line corresponding to each row of the sub-pixels;
a first scan driving circuit electrically connected to each of the scan lines, the first scan driving circuit being configured to provide scan signals to a plurality of the scan lines;
a plurality of pressure sensitive sensors;
a bias voltage signal line;
the first end of each switch unit is electrically connected to the corresponding pressure sensing sensor, the second end of each switch unit is electrically connected to the bias voltage signal line, and the control end of each switch unit is used for controlling the connection and disconnection of the first end and the second end;
the second scanning driving circuit is electrically connected to the control end of each switch unit and is used for providing scanning signals for the control ends of the switch units;
a clock signal line connected to the first scan driving circuit and the second scan driving circuit;
the first scanning driving circuit comprises a plurality of cascaded first shift registers, and the output end of each first shift register is electrically connected with each scanning line in a one-to-one correspondence manner;
the second scanning driving circuit comprises a plurality of cascaded second shift registers, and the output end of each second shift register is electrically connected with the control end of each switch unit in a one-to-one correspondence manner;
the driving chip is electrically connected with the first scanning driving circuit and the second scanning driving circuit, and is used for responding to a standby instruction to control the second scanning driving circuit to scan at a first frequency;
the input end of the first shift register of the first stage is electrically connected with the driving chip;
the input end of the first-stage second shift register is electrically connected to the driving chip;
the driving chip controls the initial scanning time of the first scanning driving circuit through the input end of the first shift register of the first stage, and controls the initial scanning time of the second scanning driving circuit through the input end of the second shift register of the first stage;
the driving chip is used for controlling the first scanning driving circuit to scan and controlling the second scanning driving circuit to scan at the same time in each frame.
2. The display panel according to claim 1,
each of the first shift registers and each of the second shift registers includes a reset signal terminal;
the display panel further includes a reset signal line electrically connected to a reset signal terminal of each of the first shift registers and each of the second shift registers.
3. The display panel according to claim 1,
each pressure sensing sensor comprises a first output end and a second output end;
the display panel further includes a first output signal line electrically connected to a first output terminal of each of the pressure-sensitive sensors and a second output signal line electrically connected to a second output terminal of each of the pressure-sensitive sensors.
4. The display panel according to claim 1,
each of the pressure sensitive sensors includes a first input and a second input;
the bias voltage signal line comprises a first bias voltage signal line and a second bias voltage signal line;
each switch unit comprises a first thin film transistor, wherein a first end of the first thin film transistor is electrically connected to a first input end of the corresponding pressure sensing sensor, a second end of the first thin film transistor is electrically connected to the first bias voltage signal line, and a control end of the first thin film transistor is electrically connected to the second scanning driving circuit;
the second bias voltage signal line is electrically connected to a second input terminal of each of the pressure sensitive sensors.
5. The display panel according to claim 4,
the second bias voltage signal line is electrically connected to a ground terminal.
6. The display panel according to claim 5,
each switch unit further comprises a second thin film transistor, wherein a first end of the second thin film transistor is electrically connected to the first input end of the corresponding pressure sensing sensor, a second end of the second thin film transistor is electrically connected to the ground end, and a control end of the second thin film transistor is electrically connected to the control end of the corresponding first thin film transistor;
the first thin film transistor and the second thin film transistor are transistors of opposite control types.
7. The display panel according to claim 1,
pressure-sensitive sensor is Wheatstone bridge type pressure sensor, Wheatstone bridge type pressure sensor includes first input, second input, first output and second output, the second output with it has first varistor to establish ties between the first input, first input with it has second varistor to establish ties between the first output, first output with it has third varistor to establish ties between the second input, the second input with it has fourth varistor to establish ties between the second output.
8. The display panel according to claim 1,
the pressure sensor is a silicon piezoresistive pressure sensor.
9. A display device characterized by comprising the display panel according to any one of claims 1 to 8.
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| CN112331127B (en) * | 2020-11-30 | 2023-06-20 | 武汉天马微电子有限公司 | Display panel driving method, display panel and display device |
| CN115223483A (en) * | 2022-07-29 | 2022-10-21 | 上海中航光电子有限公司 | Long pulse generating circuit, display panel, and electronic device |
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