CN108766327B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN108766327B CN108766327B CN201810454761.2A CN201810454761A CN108766327B CN 108766327 B CN108766327 B CN 108766327B CN 201810454761 A CN201810454761 A CN 201810454761A CN 108766327 B CN108766327 B CN 108766327B
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- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The invention provides a display panel and a display device, relates to the technical field of display, and aims to reduce the difficulty of pressure detection. The display area of the display panel is provided with a plurality of grid lines and a plurality of data lines, and the grid lines and the data lines are crossed to define a plurality of display pixels and a plurality of dummy pixels; the display pixels are arranged in a matrix mode in the display area, and the dummy pixels are positioned on one side, close to the non-display area, of the display pixels; each dummy pixel comprises a dummy pixel electrode, a dummy common electrode and a dummy thin film transistor, wherein the dummy pixel electrode and the dummy common electrode are overlapped in projection on the plane of the display panel, the control electrode of the dummy thin film transistor is connected with the grid line, the first electrode of the dummy thin film transistor is connected with the data line, and the second electrode of the dummy thin film transistor is connected with the dummy pixel electrode. A pressure sensing unit is arranged in the non-display area, and a first output end of the pressure sensing unit is connected with the dummy pixel electrode. The display panel is used for realizing picture display.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel and a display device.
[ background of the invention ]
With the development of touch display technology, in order to better meet user requirements, in addition to the conventional touch technology capable of detecting a touch position, a pressure touch technology capable of detecting a touch pressure magnitude has also appeared. The pressure touch technology generally requires a pressure sensing unit disposed in the display panel. When the display panel is pressed, the pressure sensing unit outputs a voltage signal, and the pressure when the display panel is touched by a user is obtained through detection of the voltage signal. However, since a port for reading a voltage signal is not provided on the current driver chip IC, difficulty in pressure detection is increased.
[ summary of the invention ]
In view of the above, the present invention provides a display panel and a display device, which are used to reduce the difficulty of pressure detection.
In one aspect, the present invention provides a display panel, including a display region and a non-display region, wherein the display region is provided with a plurality of gate lines and a plurality of data lines, and the gate lines and the data lines intersect to define a plurality of display pixels and a plurality of dummy pixels; the dummy pixels are positioned on one side of the display pixels close to the non-display area;
each dummy pixel comprises a dummy pixel electrode, a dummy common electrode and a dummy thin film transistor, and the projections of the dummy pixel and the dummy common electrode on the plane of the display panel are overlapped; the control electrode of the dummy thin film transistor is connected with the grid line, the first electrode of the dummy thin film transistor is connected with the data line, and the second electrode of the dummy thin film transistor is connected with the dummy pixel electrode;
and a pressure sensing unit is arranged in the non-display area and comprises a first output end and a second output end, and the first output end is connected with the dummy pixel electrode.
In another aspect, the present invention provides a display device comprising the above display panel.
The first output end of the pressure sensing unit is connected with the dummy pixel electrode, so that the voltage signal output by the pressure sensing unit can be stored in a pixel capacitor formed by the dummy pixel electrode and the dummy common electrode in a capacitor mode, and then the capacitor stored in the pixel capacitor is transmitted to the driving chip through the data line, so that the voltage signal output by the pressure sensing unit can be read by the driving chip, and the pressure detection is realized.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on 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 relationship between the dummy pixel and the pressure sensing unit in FIG. 1;
FIG. 3 is an equivalent circuit diagram of FIG. 2;
FIG. 4 is a schematic diagram of another connection relationship between the dummy pixel and the pressure sensing unit in FIG. 1;
FIG. 5 is an equivalent circuit diagram of FIG. 4;
FIG. 6 is a schematic cross-sectional view along AA' of FIG. 1;
FIG. 7 is another schematic cross-sectional view along AA' of FIG. 1;
FIG. 8 is a first schematic structural diagram of a pressure sensing unit in a display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a pressure sensing unit in a display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It is to be understood that the terminology used in the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment of the invention, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that although the terms first and second may be used to describe the outputs in embodiments of the present invention, the outputs should not be limited to these terms. These terms are only used to distinguish the output ends from each other. For example, the first output terminal may also be referred to as the second output terminal, and similarly, the second output terminal may also be referred to as the first output terminal, without departing from the scope of embodiments of the present invention.
The present embodiment provides a display panel, as shown in fig. 1, fig. 1 is a schematic structural diagram of the display panel provided in the present embodiment, the display panel includes a display area 1 and a non-display area 2, the display area 1 is provided with a plurality of gate lines G and a plurality of data lines D, the gate lines G and the data lines D intersect to define a plurality of display pixels 11 and a plurality of dummy pixels 12, wherein the plurality of display pixels 11 are arranged in a matrix in the display area 1, and the dummy pixels 12 are located on a side of the display pixels 11 close to the non-display area 2.
As shown in fig. 2, fig. 2 is a schematic diagram of a connection relationship between the dummy pixel and the pressure sensing unit in fig. 1, wherein each dummy pixel 12 includes a dummy pixel electrode 121, a dummy common electrode 122 and a dummy thin film transistor 123, and projections of the dummy pixel electrode 121 and the dummy common electrode 122 on a plane where the display panel is located overlap; a control electrode of the dummy thin film transistor 123 is connected to the gate line G, a first electrode of the dummy thin film transistor 123 is connected to the data line D, and a second electrode of the dummy thin film transistor 123 is connected to the dummy pixel electrode 121.
Referring to fig. 1 and 2, the pressure sensing unit 3 is disposed in the non-display area 2, the pressure sensing unit 3 includes a first output terminal 31 and a second output terminal 32, and the first output terminal 31 is connected to the dummy pixel electrode 121.
Note that the display pixels 11 are used for normal display of a screen in the display panel, and the dummy pixels 12 do not emit light in the display panel. This is because when manufacturing the display panel, it is usually necessary to separately manufacture the array substrate and the color filter substrate, and then the array substrate and the color filter substrate are stacked to form the display panel. In general, in the manufacturing process of the array substrate, the uniformity of the equipment or other process conditions at the beginning and the end of the manufacturing process is poor, and the uniformity at the middle stage of the manufacturing process is good. Therefore, in order to increase the yield of each display pixel in the display area, dummy pixels in the display area near the non-display area in the array substrate are usually not illuminated, so that even at the beginning or end of the manufacturing process, the yield of these dummy pixels produced due to the instability of the process is not high, and the display effect of the final display panel is not affected. In this case, the data voltage supplied from the driver IC received by the data line D connected to the dummy pixel 12 is usually set to zero, and a black matrix is provided in the color filter substrate at a position corresponding to the dummy pixel 12.
Based on the above structure and connection manner, as shown in fig. 1 and 2, when the display panel is pressed, the pressure sensing unit 3 outputs a voltage signal, which is transmitted to the dummy pixel electrode 121 through the first output terminal 31, and since the dummy pixel electrode 121 and the dummy common electrode 122 overlap in projection on the plane of the display panel, they can form the pixel capacitor CstThe dummy pixel electrode 121 forms a pixel capacitor CstThe dummy common electrode 122 constitutes a pixel capacitance CstThe other plate of (a). As shown in fig. 3, fig. 3 is an equivalent circuit diagram of fig. 2. Wherein C islcWhich is an equivalent capacitance of a liquid crystal (not shown) positioned between the dummy pixel electrode 121 and the dummy common electrode 122. Thus, when the pressure sensing unit 3 transmits the output voltage signal to the dummy pixel electrode 121, the voltage signal can be stored in the pixel capacitor C in the form of a capacitorstIn (1). Specifically, since the dummy pixel electrode 121 is connected to the second electrode of the dummy thin film transistor 123 and the first electrode of the dummy thin film transistor 123 is connected to the data line D, the voltage signal is stably stored in the pixel capacitor C in the form of electric chargestAfter the capacitors are formed on the two electrode plates, the stably stored capacitors can be transmitted to the driving chip through the dummy thin film transistor 123 and the data line D, that is, the voltage signal output by the pressure sensing unit 3 can be read by the driving chip. That is, the present embodiment passes through the pixel capacitance C in the dummy pixel 12stThe pressure sensing unit 3 can convert the voltage amount output by the pressure sensing unit into a capacitance, so that the driving chip IC can realize pressure detection by reading the capacitance.
In addition, the present embodiment stores the voltage signal output from the pressure sensing unit 3 in the form of capacitance in the pixel capacitance C formed by the dummy pixel electrode 121 and the dummy common electrode 122stTo be stored stably in the pixel capacitor CstAfter that, the pixel capacitor C can be connected to the dummy TFT 123 and the data line D existing in the display panelstTransfer of stored capacitance to driveThe chip IC does not need to be additionally provided with the wiring for connecting the pressure sensing unit 3 and the driving chip IC, thereby reducing the number of the wiring, narrowing the width of the frame and being beneficial to the narrow frame design of the display panel.
In addition, as shown in fig. 1, the non-display region 2 may include a first non-display region 21 and a second non-display region 22 located at both sides of the display region 1, and the first non-display region 21, the display region 1, and the second non-display region 22 are sequentially arranged in the row direction. In general, a column of dummy pixels 12 is arranged on both the side of the display area 1 near the first non-display area 21 and the side of the display area 1 near the second non-display area 22. Further, in order to increase the sensing range of the pressure sensing unit 3 and improve the sensing accuracy, the present embodiment may provide a plurality of pressure sensing units 3 in the first non-display area 21 and the second non-display area 22, respectively. The connection relationship between the pressure sensing unit 3 disposed in the first non-display area 21 and the adjacent dummy pixel 12 and the connection relationship between the pressure sensing unit 3 disposed in the second non-display area 22 and the adjacent dummy pixel 12 are the same as the above connection relationship, and are not described herein again.
When one side of the display panel comprises a plurality of pressure sensing units 3, the first output ends 31 of the plurality of pressure sensing units 3 are respectively connected with the dummy pixel electrodes 121 of the dummy pixels 12 in the same column, so that signals output by the plurality of pressure sensing units 3 can be transmitted to the driving chip IC through the same data line D via the dummy pixel electrodes 121, thereby avoiding the problem of excessively wide frame caused by large occupied space when one output wire is respectively arranged for each pressure sensing unit 3, i.e. the embodiment can transmit voltage signals output by the plurality of pressure sensing units 3 positioned at one side of the display panel to the driving chip through one data line D, fully utilizing the space where the dummy pixels 12 are positioned, reducing the occupied wire space for connecting the pressure sensing units 3 with the driving chip IC, further reducing the frame width, the narrow frame design of the display panel can be better realized.
Besides, for the plurality of pressure sensing units 3 located in the first non-display area 21 or the second non-display area 22 of the display panel, as described above, since the present embodiment connects the first output terminals 31 of the plurality of pressure sensing units 3 with the respective dummy pixel electrodes 121 of the dummy pixels 12 in the same column, so as to transmit the signals output by the plurality of pressure sensing units 3 to the driving chip IC through the respective dummy pixel electrodes 121 via the same data line D, it is also possible to connect the plurality of pressure sensing units 3 located in the first non-display area 21 or the second non-display area 22 of the display panel to one port of the driving chip IC through one data line D, thereby avoiding providing one port for each pressure sensing unit 3 on the driving chip IC, and greatly reducing the number of ports on the driving chip IC.
On the basis, the pixel capacitance C is utilizedstThe voltage signal output by the storage pressure sensing unit can be implemented as follows:
as shown in fig. 2 and 3, the first output terminal 31 and the second output terminal 32 of the pressure sensing unit 3 are respectively connected to the dummy pixel electrode 121 and the dummy common electrode 122 of the same dummy pixel 12, that is, as shown in fig. 3, the first output terminal 31 is electrically connected to the dummy pixel electrode 121, and the second output terminal 32 is electrically connected to the dummy common electrode 122 of the same dummy pixel 12. When the display panel is in operation, the first output terminal 31 transmits the output first voltage value to the dummy pixel electrode 121, and the second output terminal 32 transmits the output second voltage value to the dummy common electrode 122.
When the display panel is stressed, the first voltage value and the second voltage value outputted by the first output terminal 31 and the second output terminal 32 are different, that is, there is a potential difference between the signals outputted by the first output terminal 31 and the second output terminal 32, so that the first output terminal 31 and the second output terminal 32 can be equivalent to a power supply, because the first output terminal 31 and the second output terminal 32 are respectively connected with the dummy pixel electrode 121 and the dummy common electrode 122 of the same dummy pixel 12, and therefore, the power supply is equivalent to a pixel capacitor C formed by the dummy pixel electrode 121 and the dummy common electrode 122stCharging is carried out on the pixel capacitor CstIn the charging process, the positive and negative charges in the power supply can move to the pixel capacitor C under the action of the potential differencestPositive and negative plates of, during movement of charge, the pixel capacitance CstThe charges stored by the two polar plates are increased continuously until the pixel capacitance CstWhen the voltage between the two polar plates is equal to the power supply voltage, the charge stops moving and reaches a saturation state. After the charge accumulation is finished, the pixel capacitor CstThe capacitance value of (2) is also stabilized. Then, the stably stored capacitor can be transmitted to the driving chip IC via the data line D to realize reading of the voltage signal output by the pressure sensing unit 3 by the driving chip IC, thereby realizing pressure detection.
When the display panel is not under pressure, the first voltage value and the second voltage value outputted by the first output terminal 31 and the second output terminal 32 are equal, that is, there is no voltage difference between the signals outputted by the first output terminal 31 and the second output terminal 32, so that it is equivalent to that the power supply does not supply power to the pixel capacitor C formed by the dummy pixel electrode 121 and the dummy common electrode 122 at this timestCharging, pixel capacitance CstThe amount of charge stored is 0, the capacitance transmitted to the driving chip IC through the data line D is also 0, and the finally obtained pressure detection value is also 0 accordingly.
Specifically, as shown in fig. 2, the first output terminal 31 of the pressure sensing unit 3 is connected to the dummy pixel electrode 121 of the dummy pixel 12 through the switching element 4. When the display panel is pressed, the first output terminal 31 generates a first voltage value and the second output terminal 32 generates a second voltage value, and when the switching element 4 is turned on, the first voltage value and the second voltage value are stored as charges in the pixel capacitor C formed by the dummy pixel electrode 121 and the dummy common electrode 122stIn (1). After the capacitance is stabilized, the switching element 4 is turned off to avoid the pixel capacitance CstThe stored charges are reversely moved to one side of the pressure sensing unit 3 to make the pixel capacitor CstThe charges stored in the upper electrode can all flow unidirectionally to the driving chip IC through the dummy thin film transistor 123 and the data line D, thereby improving the accuracy of pressure detection.
Specifically, the control terminal of the switching element 4 is connected to a switching control signal line (not shown) to control the switching element 4 to be turned on or off by the switching control signal line.A first terminal of the switching element 4 is connected to the first output terminal 31 of the pressure sensing unit 3 and a second terminal of the switching element 4 is connected to the dummy pixel electrode 121 of the dummy pixel 12. Illustratively, the dummy thin film transistor 123 and the switching element 4 are turned on in a time-sharing manner. Thus, when the switch element 4 is controlled to be turned on by the switch control signal line, the dummy thin film transistor 123 is controlled to be turned off by the gate line G, and the display panel is pressed, the voltage signals outputted from the first output terminal 31 and the second output terminal 32 are applied to the pixel capacitor C formed by the dummy pixel electrode 121 and the dummy common electrode 122stAnd charging is carried out. When the switching element 4 is turned off by the switching control signal line and the dummy thin film transistor 123 is turned on by the gate line G, the pixel capacitor CstThe stored capacitance is transmitted to the driving chip IC through the data line D to read the voltage signal output by the pressure sensing unit 3 by the driving chip IC, thereby realizing the pressure detection. For example, the switch control signal line can control the on time of the switch element 4 according to the pixel capacitance CstThe charging effect of (2) is not limited in this embodiment.
As shown in fig. 4 and 5, fig. 4 is a schematic view of another connection relationship between the dummy pixel and the pressure sensing unit in fig. 1, and fig. 5 is an equivalent circuit diagram of fig. 4. The first output terminal 31 of the pressure sensing unit 3 is connected to the dummy pixel electrode 121 of the mth dummy pixel 12, and the second output terminal 32 of the pressure sensing unit 3 is connected to the dummy pixel electrode 121 of the nth dummy pixel 12, where m ≠ n. That is, two output terminals of the same pressure sensing unit 3 are connected to different dummy pixels 12, respectively.
When the display panel is in operation, the first output terminal 31 transmits the output first voltage value to the dummy pixel electrode 121 of the mth dummy pixel 12, and the second output terminal 32 transmits the output second voltage value to the dummy pixel electrode of the nth dummy pixel 12, where the dummy common electrode 122 of each dummy pixel 12 may be connected to a common signal terminal or other fixed signal terminals. Therefore, in the case where the potentials of the dummy common electrode 122 of the m-th dummy pixel 12 and the dummy common electrode 122 of the n-th dummy pixel 12 are equal, it is assumed that the potential of the dummy common electrode 122 of the m-th dummy pixel 12 is equal to that of the dummy common electrode of the n-th dummy pixel 12 after the completion of the chargingPixel capacitance C formed by dummy pixel electrode 121 and dummy common electrode 122 of m dummy pixels 12stHas a capacitance value of CmA pixel capacitor C formed by the dummy pixel electrode 121 and the dummy common electrode 122 of the n-th dummy pixel 12stHas a capacitance value of CnWhen the display panel is pressed, the first voltage value and the second voltage value output by the first output terminal 31 and the second output terminal 32 are different, so Cm≠Cn,Correspondingly, the pixel capacitance C when constituted by the m-th dummy pixel 12stThe capacitance stored in (b) is transmitted to the driving chip IC via the data line D, and the pixel capacitance C formed by the n-th dummy pixel 12stAfter the stored capacitor is transmitted to the driving chip IC through the data line D, the driving chip IC reads the capacitance value twice and performs difference to realize pressure detection. When the display panel is not under pressure, the first voltage value and the second voltage value outputted by the first output terminal 31 and the second output terminal 32 are equal, so that C is the same at this timem＝CnCorrespondingly, the pixel capacitance C when constituted by the m-th dummy pixel 12stThe capacitance stored in (b) is transmitted to the driving chip IC via the data line D, and the pixel capacitance C formed by the n-th dummy pixel 12stAfter the stored capacitance is transmitted to the driving chip IC through the data line D, the capacitance value is read twice by the driving chip IC and a difference is made, so that a pressure detection value of 0 is obtained.
Specifically, during the operation of the display panel, the gate lines G are sequentially turned on, and taking the example that the mth row of gate lines Gm is turned on before the nth row of gate lines Gn, when the mth row of gate lines is turned on, the pixel capacitor C formed by the mth dummy pixel 12 is turned onstThe stored capacitance is transmitted to the driving chip IC through the data line D, and then the nth row of gate lines is turned on, and the pixel capacitance C formed by the nth dummy pixel 12 is formedstThe stored capacitance is transmitted to the driving chip IC through the data line D, and then the driving chip IC reads the capacitance values twice and makes a difference to obtain a pressure detection value.
Optionally, in this embodiment, m is equal to n +1 or n is equal to m +1, that is, two dummy pixels 12 connected to the same pressure sensing unit 3 are located in two adjacent rows, so as to shorten a time difference between the first voltage value and the second voltage value output by each pressure sensing unit 3 and transmitted to the driving chip IC, so that the driving chip IC can receive the first pressure value and the second pressure value output by the same pressure sensing unit 3 in a shorter time, and further, the number of other signals interspersed between the first pressure value and the second pressure value output by one pressure sensing unit 3 received by the driving chip IC can be reduced, thereby improving the accuracy of pressure detection.
Specifically, as shown in fig. 4 and 5, the first output terminal 31 of the pressure sensing unit 3 is connected to the dummy pixel electrode 121 of the m-th dummy pixel 12 through the first switching element 41, and the second output terminal 32 of the pressure sensing unit 3 is connected to the dummy pixel electrode 121 of the n-th dummy pixel 12 through the second switching element 42. When the display panel is stressed, the first output terminal 31 generates a first voltage value, the second output terminal 32 generates a second voltage value, when the first switch element 41 is turned on, the first voltage value is transmitted to the dummy pixel electrode 121 of the mth dummy pixel 12 through the first switch element 41, and since the dummy common electrode 122 is connected to the common signal terminal or other fixed voltage signal terminals, at this time, the voltage signal of the first voltage value connected to the common electrode 122 is stored in the pixel capacitor C formed by the dummy pixel electrode 121 and the dummy common electrode 122 of the mth dummy pixel 12 in the form of chargestIn (1). After the capacitance is stabilized, the first switch element 41 is turned off to avoid the pixel capacitance CstThe stored charges are reversely moved to one side of the pressure sensing unit 3 to make the pixel capacitor CstThe charge stored thereon can flow unidirectionally to the driving chip IC through the dummy thin film transistor 123 and the data line D; similarly, when the second switching element 42 is turned on, the second voltage value is transmitted to the dummy pixel electrode 121 of the nth dummy pixel 12 through the second switching element 42, and since the dummy common electrode 122 is connected to the common signal terminal or other fixed voltage signal terminal, the voltage signal having the second voltage value connected to the common electrode 122 is stored in the pixel capacitor C formed by the dummy pixel electrode 121 and the dummy common electrode 122 of the nth dummy pixel 12 in the form of chargestIn (1). After the capacitance is stabilized, willThe second switching element 42 is turned off to avoid the pixel capacitance CstThe stored charges are reversely moved to one side of the pressure sensing unit 3 to make the pixel capacitor CstThe charge stored in the upper electrode can flow unidirectionally to the driving chip IC through the dummy thin film transistor 123 and the data line D to improve the accuracy of pressure detection.
Illustratively, a control terminal of the first switching element 41 is connected to a first switching control signal line (not shown), a first terminal of the first switching element 41 is connected to the first output terminal 31 of the pressure sensing unit 3, and a second terminal of the first switching element 41 is connected to the dummy pixel electrode of the m-th dummy pixel 12; a control terminal of the second switching element 42 is connected to a second switching control signal line (not shown), a first terminal of the second switching element 42 is connected to the second output terminal 32 of the pressure sensing unit 3, and a second terminal of the second switching element 42 is connected to the dummy pixel electrode 121 of the nth dummy pixel 12, so as to control the first switching element 41 and the second switching element 42 to be turned on or off through the first switching control signal line and the second switching control signal line, respectively. For example, the dummy thin film transistor 123 and the first switching element 41 of the m-th dummy pixel 12 are turned on at a time division, and the dummy thin film transistor 123 and the second switching element 42 of the n-th dummy pixel 12 are turned on at a time division. Thus, when the first switching element 41 is controlled to be turned on by the first switching control signal line, the dummy thin film transistor 123 of the mth dummy pixel 12 is controlled to be turned off by the gate line Gm, and the display panel is stressed, the first voltage value output from the first output terminal 31 and the fixed voltage value received by the dummy common electrode 122 correspond to the pixel capacitor C formed by the dummy pixel electrode 121 and the dummy common electrode 122 of the mth row of dummy pixels 12stAnd charging is carried out. When the first switching element 41 is turned off by the first switching control signal line and the dummy thin film transistor 123 of the mth dummy pixel 12 is turned on by the gate line Gm, the pixel capacitor CstThe capacitance stored in (b) is transmitted to the driving chip IC via the data line D to realize reading of the voltage signal output by the first output terminal 31 of the pressure sensing unit 3 by the driving chip IC. When the second switching element 42 is controlled to be turned on by the second switching control signal line, the dummy pixel 12 of the nth dummy pixel is controlled by the gate line GnWhen the thin film transistor 123 is turned off and the display panel is pressed, the second voltage value output from the second output terminal 32 and the fixed voltage value received by the dummy common electrode 122 correspond to the pixel capacitance C formed by the dummy pixel electrode 121 and the dummy common electrode 122 of the dummy pixel 12 in the nth rowstAnd charging is carried out. When the second switching element 42 is turned off by the second switching control signal line and the dummy thin film transistor 123 of the nth dummy pixel 12 is turned on by the gate line Gn, the pixel capacitance CstThe stored capacitance is transmitted to the driving chip IC through the data line D to read the voltage signal output from the second output terminal 32 of the pressure sensing unit 3 by the driving chip IC, and then the capacitance value is read twice by the driving chip IC and the difference is made, so that the pressure detection can be realized. For example, the first and second switch control signal lines may control the turn-on time of the first and second switch elements 41 and 42 according to the pixel capacitance CstThe charging effect of (2) is not limited in this embodiment.
For example, the present embodiment does not limit the turn-on sequence of the first switch element 41 and the second switch element 42, that is, the control signals of the first switch control signal line and the second switch control signal line may be the same, so that the first switch element 41 and the second switch element 42 may be turned on or off at the same time; or the control signals of the first switch control signal line and the second switch control signal line may be different, for example, the first switch element 41 may be controlled to be turned on first by the first switch control signal line, and then the second switch element 42 may be controlled to be turned off by the second switch control signal line; the second switching element 42 may be controlled to be turned on first by the second switching control signal line, and then the first switching element 41 may be controlled to be turned off by the first switching control signal line, so long as the first switching element 41 and the dummy thin film transistor 123 of the m-th dummy pixel 12 are ensured to be turned on in a time-sharing manner, and the second switching element 42 and the dummy thin film transistor 123 of the n-th dummy pixel 12 are ensured to be turned on in a time-sharing manner.
For example, the dummy common electrode 122 of the m-th dummy pixel 12 and the dummy common electrode 122 of the n-th dummy pixel 12 are connected to the common signal terminal, that is, in the present embodiment, each dummy common electrode 122 receives the same signal, so that each dummy common electrode can be made into a whole structure during manufacturing, thereby simplifying the manufacturing process.
Illustratively, as shown in fig. 1, the display pixel 11 includes a display pixel electrode 111 and a display common electrode 112, wherein an overlapping area of a projection of the display pixel electrode 111 and the display common electrode 112 on a plane of the display panel is a first area, and an overlapping area of a projection of the dummy pixel electrode 121 and the dummy common electrode 122 on the plane of the display panel is a second area. As shown in fig. 6, fig. 6 is a schematic cross-sectional view along AA' of fig. 1, wherein the vertical distance between the display pixel electrode 111 and the display common electrode 112 is a first distance d 1; the vertical distance between the dummy pixel electrode 121 and the dummy common electrode 122 is a second distance d 2.
Wherein the second area is larger than the first area, and/or the second distance d2 is smaller than the first distance d 1. From the capacitance calculation formula of the parallel plate capacitor:
wherein ε is the dielectric constant of the medium, S is the facing area of the two plates of the capacitor, k is the constant of the electrostatic force, and d is the vertical distance between the two plates of the capacitor, the present embodiment increases the pixel capacitance C formed by the dummy pixel electrode 121 and the dummy common electrode 122 of the dummy pixel 12 by increasing the facing area between the dummy pixel electrode 121 and the dummy common electrode 122 or by decreasing the vertical distance between the dummy pixel electrode 121 and the dummy common electrode 122 based on the arrangement of the display pixel electrode 111 and the display common electrode 112 for the screen display to make the arrangement of the dummy pixel 12 satisfy at least one of the two conditionsstThe storable capacitance range further enables the dummy pixel 12 to detect a pressure in a wide range, thereby increasing the pressure detection range.
Alternatively, as shown in fig. 7, fig. 7 is another schematic cross-sectional view along AA' of fig. 1, the dummy pixel 12 further includes a compensation metal layer 124, the compensation metal layer 124 overlaps with the projection of the dummy pixel electrode 121 on the plane of the display panel, and the compensation metal layer 124 overlaps with the projection of the dummy common electrode 122 on the plane of the display panel; the compensation metal layer 124 is connected to a common signal terminal (not shown). In this embodiment, the compensation metal layer 124 is additionally provided, which is equivalent to adding a pixel capacitor formed by the compensation metal layer 124 and the dummy pixel electrode 121, and the added pixel capacitor formed by the compensation metal layer 124 and the dummy pixel electrode 121 is connected in parallel with the pixel capacitor formed by the dummy common electrode 122 and the dummy pixel electrode 121, so that the finally formed capacitor is the sum of the two capacitors, the storable capacitance range is further increased, and the pressure detection range can be further increased. For example, the compensation metal layer 124 may be disposed on the same layer as the gate line G or the data line D to simplify the manufacturing process.
It should be noted that, in this embodiment, the pressure sensing unit 3 further includes two signal input ends, and when performing pressure detection, a bias voltage is input to the pressure sensing unit 3 through the two signal input ends, and a first voltage value and a second voltage value are respectively output through the first output end 31 and the second output end 32 of the pressure sensing unit 3, so as to implement pressure detection.
Alternatively, the pressure sensing unit 3 may be a wheatstone bridge type pressure sensor. As shown in fig. 8, fig. 8 is a schematic structural diagram of a pressure sensing unit provided in the embodiment of the present invention. When the pressure sensing unit 3 is a wheatstone bridge type pressure sensor, a first resistor R1 is connected IN series between the first input terminal IN1 and the first output terminal OUT1 of the pressure sensing unit 3, a second resistor R2 is connected IN series between the first output terminal OUT1 and the second input terminal IN2, a third resistor R3 is connected IN series between the second input terminal IN2 and the second output terminal OUT2, and a fourth resistor R4 is connected IN series between the second output terminal OUT2 and the first input terminal IN 1.
When the display panel is not deformed, the bridge is in an equilibrium state, i.e., the ratio of the resistances of the first resistor R1 and the second resistor R2 is equal to the ratio of the resistances of the fourth resistor R4 and the third resistor R3, and the voltage value of the first output terminal OUT1 is equal to the voltage value of the second output terminal OUT 2.
When certain pressure is applied to the display panel to deform the display panel, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 deform, so that the resistance values of the resistors change, and the balance state of the bridge is broken. At this time, the ratio of the resistances of the first resistor R1 and the second resistor R2 is not equal to the ratio of the resistances of the fourth resistor R4 and the third resistor R3, and the voltage value at the first output terminal OUT1 is not equal to the voltage value at the second output terminal OUT 2. The difference between the voltage value of the first output terminal OUT1 and the voltage value of the second output terminal OUT2 corresponds to the pressure value applied to the display panel, and the corresponding pressure value can be obtained based on the voltage value of the first output terminal OUT1, the voltage value of the second output terminal OUT2 and the corresponding relationship.
Alternatively, the pressure sensing unit 3 may also be a silicon piezoresistive pressure sensor. As shown in fig. 9, fig. 9 is another schematic structural diagram of the pressure sensing unit provided in the embodiment of the present invention. When the pressure sensing unit is a silicon piezoresistive pressure sensor, the pressure sensing unit is of a whole quadrilateral structure and comprises a first edge, a second edge, a third edge and a fourth edge which are sequentially connected. The pressure sensing unit has a first input IN1 connected to the first edge, a first output OUT1 connected to the second edge, a second input IN2 connected to the third edge, and a second output OUT2 connected to the fourth edge.
When a certain pressure is applied to the display panel to deform the display panel, the resistance value of the silicon piezoresistive pressure sensor changes, the voltage signals output by the first output end OUT1 and the second output end OUT2 correspondingly change, and the pressure applied to the silicon piezoresistive pressure sensor is detected according to the change of the voltage signals output by the first output end OUT1 and the second output end OUT 2.
Fig. 10 is a schematic structural diagram of a display device provided in an embodiment of the present invention, and the display device includes the display panel 100. The specific structure and operation principle of the display panel 100 have been described in detail in the above embodiments, and are not described herein again. Of course, the display device shown in fig. 10 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
Since the display device provided in this embodiment includes the display panel 100 as described above, with this display device, after the voltage signal output from the pressure sensing unit 3 is transmitted to the dummy pixel electrode 121, the voltage signal can be stored in the pixel capacitor C in the form of a capacitorstIn (1). Then, the stably stored capacitance can be transmitted to the driving chip via the dummy thin film transistor 123 and the data line D, that is, the voltage signal output by the pressure sensing unit 3 can be read by the driving chip, that is, the embodiment is realized by the pixel capacitance C in the dummy pixel 12stThe pressure sensing unit 3 can convert the voltage output by the pressure sensing unit into capacitance, so that the driving chip IC can realize pressure detection by reading the capacitance.
In addition, the present embodiment stores the voltage signal output from the pressure sensing unit 3 in the form of capacitance in the pixel capacitance C formed by the dummy pixel electrode 121 and the dummy common electrode 122stTo be stored stably in the pixel capacitor CstAfter that, the pixel capacitor C can be connected to the dummy TFT 123 and the data line D existing in the display panelstThe stored capacitor is transmitted to the driving chip IC, and the wiring for connecting the pressure sensing unit 3 and the driving chip IC is not required to be additionally arranged, and the data line D in the display panel is used as the wiring for connecting the pressure sensing unit 3 and the driving chip IC, namely, the data line can be multiplexed into the output line of the voltage signal by the arrangement of the embodiment, so that the extra wiring in the display panel is avoided, the width of the frame can be narrowed, and the narrow frame design of the display device is facilitated.
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.
Claims (17)
1. The display panel is characterized by comprising a display area and a non-display area, wherein the display area is provided with a plurality of grid lines and a plurality of data lines, and the grid lines and the data lines are crossed to define a plurality of display pixels and a plurality of dummy pixels; the dummy pixels are positioned on one side of the display pixels close to the non-display area;
each dummy pixel comprises a dummy pixel electrode, a dummy common electrode and a dummy thin film transistor, and the projections of the dummy pixel electrode and the dummy common electrode on the plane of the display panel are overlapped; the control electrode of the dummy thin film transistor is connected with the grid line, the first electrode of the dummy thin film transistor is connected with the data line, and the second electrode of the dummy thin film transistor is connected with the dummy pixel electrode;
and a pressure sensing unit is arranged in the non-display area and comprises a first output end and a second output end, and the first output end of the pressure sensing unit and the second output end of the pressure sensing unit are respectively connected with the same dummy pixel electrode and the same dummy common electrode of the dummy pixel.
2. The display panel according to claim 1, wherein the non-display region includes a first non-display region and a second non-display region located on both sides of the display region, and the first non-display region, the display region, and the second non-display region are arranged in order in a row direction;
the first non-display area and/or the second non-display area are/is provided with a plurality of pressure sensing units;
the first output ends of the plurality of pressure sensing units positioned in the first non-display area are connected with the dummy pixel electrodes of the dummy pixels in the same column;
the first output ends of the plurality of pressure sensing units positioned in the second non-display area are connected with the dummy pixel electrodes of the dummy pixels in the same column.
3. The display panel according to claim 2, wherein the first output terminal of the pressure sensing unit is connected to the dummy pixel electrode of the dummy pixel through a switching element.
4. The display panel according to claim 3, wherein a control terminal of the switching element is connected to a switching control signal line, a first terminal of the switching element is connected to a first output terminal of the pressure sensing unit, and a second terminal of the switching element is connected to the dummy pixel electrode of the dummy pixel.
5. The display panel according to claim 3, wherein the dummy thin film transistor and the switching element are turned on in a time-sharing manner.
6. The display panel according to claim 1, wherein the display pixel includes a display pixel electrode and a display common electrode;
the overlapping area of the projection of the display pixel electrode and the display common electrode on the plane of the display panel is a first area; the vertical distance between the display pixel electrode and the display common electrode is a first distance;
the overlapping area of the projection of the dummy pixel electrode and the dummy common electrode on the plane of the display panel is a second area; the vertical distance between the dummy pixel electrode and the dummy common electrode is a second distance;
the second area is greater than the first area; and/or the second distance is less than the first distance.
7. The display panel of claim 1, wherein the dummy pixel further comprises a compensation metal layer, the compensation metal layer overlaps with a projection of the dummy pixel electrode on a plane of the display panel, and the compensation metal layer overlaps with a projection of the dummy common electrode on the plane of the display panel;
the compensation metal layer is connected with the common signal terminal.
8. The display panel of claim 7, wherein the compensation metal layer is disposed on a same layer as the gate line or the data line.
9. The display panel is characterized by comprising a display area and a non-display area, wherein the display area is provided with a plurality of grid lines and a plurality of data lines, and the grid lines and the data lines are crossed to define a plurality of display pixels and a plurality of dummy pixels; the dummy pixels are positioned on one side of the display pixels close to the non-display area;
each dummy pixel comprises a dummy pixel electrode, a dummy common electrode and a dummy thin film transistor, and the projections of the dummy pixel electrode and the dummy common electrode on the plane of the display panel are overlapped; the control electrode of the dummy thin film transistor is connected with the grid line, the first electrode of the dummy thin film transistor is connected with the data line, and the second electrode of the dummy thin film transistor is connected with the dummy pixel electrode;
a pressure sensing unit is arranged in the non-display area and comprises a first output end and a second output end, the first output end of the pressure sensing unit is connected with the dummy pixel electrode of the mth dummy pixel, and the second output end of the pressure sensing unit is connected with the dummy pixel electrode of the nth dummy pixel; wherein m ≠ n.
10. The display panel according to claim 9, wherein a first output terminal of the pressure sensing unit is connected to the dummy pixel electrode of an m-th dummy pixel through a first switching element, and a second output terminal of the pressure sensing unit is connected to the dummy pixel electrode of an n-th dummy pixel through a second switching element.
11. The display panel according to claim 10, wherein a control terminal of the first switching element is connected to a first switching control signal line, a first terminal of the first switching element is connected to a first output terminal of the pressure sensing unit, and a second terminal of the first switching element is connected to the dummy pixel electrode of an m-th dummy pixel;
the control end of the second switch element is connected with a second switch control signal line, the first end of the second switch element is connected with the second output end of the pressure sensing unit, and the second end of the second switch element is connected with the n-th dummy pixel electrode of the dummy pixel.
12. The display panel according to claim 10, wherein the dummy thin film transistor and the first switching element of an mth one of the dummy pixels are turned on at a time division basis, and wherein the dummy thin film transistor and the second switching element of an nth one of the dummy pixels are turned on at a time division basis.
13. The display panel according to claim 9, wherein the dummy common electrode of the mth one of the dummy pixels and the dummy common electrode of the nth one of the dummy pixels are connected to a common signal terminal.
14. The display panel according to claim 9, wherein m is n +1 or n is m + 1.
15. The display panel according to any one of claims 1 to 14, wherein the pressure sensing unit is a wheatstone bridge type pressure sensor;
the Wheatstone bridge type pressure sensor's first input and first output establish ties between have first voltage-variable resistance, it has second voltage-variable resistance to establish ties between first output and the second input, the second input with it has third voltage-variable resistance to establish ties between the second output, the second output with it has fourth voltage-variable resistance to establish ties between the first input.
16. The display panel according to any one of claims 1 to 14, wherein the pressure sensing unit is a silicon piezoresistive pressure sensor.
17. A display device comprising the display panel according to any one of claims 1 to 16.
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| CN107561761A (en) * | 2017-09-20 | 2018-01-09 | 厦门天马微电子有限公司 | A kind of display panel and its driving method, display device |
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