CN107340931B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107340931B CN107340931B CN201710769304.8A CN201710769304A CN107340931B CN 107340931 B CN107340931 B CN 107340931B CN 201710769304 A CN201710769304 A CN 201710769304A CN 107340931 B CN107340931 B CN 107340931B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
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- Measuring Fluid Pressure (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention provides a display panel and a display device, including: the display panel comprises a display area and a non-display area surrounding the display area, the display panel is rectangular, and the pressure sensing unit is located in the non-display area and at the long edge of the rectangle; the direction parallel to the short side of the rectangle is a first direction, the direction parallel to the long side of the rectangle is a second direction, the display panel is sequentially divided into a plurality of strain areas along the second direction, an intersection line between any two of the plurality of strain areas extends along the first direction, and the plurality of strain areas comprise at least three areas; at least one of the pressure sensing cells is located in at least two of the plurality of strain regions simultaneously. The embodiment of the invention provides a display panel and a display device, which are used for reducing the influence of temperature on a pressure sensor and improving the detection precision of the pressure sensor.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a display panel and a display device.
Background
At present, a display panel with a touch function is widely applied to various display products such as mobile phones, tablet computers, information query machines in public halls and the like as an information input tool. Therefore, the user can operate the electronic equipment by only touching the mark on the display panel with fingers, dependence of the user on other equipment (such as a keyboard, a mouse and the like) is eliminated, and man-machine interaction is simpler.
In order to better meet the requirements of users, a pressure sensor for detecting the magnitude of a touch pressure value when a user touches a display panel is usually arranged in the display panel, so that the display panel can not only collect touch position information, but also collect the magnitude of the touch pressure value, and the application range of the touch display technology is expanded. In the past, how to improve the detection accuracy of the pressure sensor is an important technical problem in the industry.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for reducing the influence of temperature on a pressure sensor and improving the detection precision of the pressure sensor.
In a first aspect, an embodiment of the present invention provides a pressure sensor, including:
the pressure sensing unit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end and the second connecting end are respectively and electrically connected with a bias voltage circuit, the third connecting end and the fourth connecting end are respectively and electrically connected with a voltage detection circuit, and the first connecting end, the second connecting end, the third connecting end and the fourth connecting end form a Wheatstone bridge;
the pressure sensing unit comprises four resistors, each resistor is electrically connected between the first connecting end and the fourth connecting end, the second connecting end and the third connecting end, and each resistor comprises a plurality of resistor units connected in series;
the plurality of resistance units between the first connecting end and the third connecting end are in one-to-one correspondence with the plurality of resistance units between the first connecting end and the fourth connecting end, the resistance units between the first connecting end and the third connecting end which are in one-to-one correspondence are arranged adjacent to the resistance units between the first connecting end and the fourth connecting end, and the distance between the resistance units is smaller than a preset value; the plurality of resistor units between the second connecting end and the third connecting end are in one-to-one correspondence with the plurality of resistor units between the second connecting end and the fourth connecting end, the resistor units between the second connecting end and the third connecting end which are in one-to-one correspondence are arranged adjacent to the resistor units between the second connecting end and the fourth connecting end, and the distance between the resistor units is smaller than a preset value; alternatively, the first and second electrodes may be,
the third connecting end and the plurality of resistor units between the first connecting ends are in one-to-one correspondence with the plurality of resistor units between the third connecting end and the second connecting end, the resistor units between the third connecting end and the first connecting end which are in one-to-one correspondence are arranged adjacent to the resistor units between the third connecting end and the second connecting end, and the distance between the resistor units is smaller than a preset value; the fourth connecting end and the plurality of resistor units between the first connecting ends are in one-to-one correspondence with the plurality of resistor units between the fourth connecting end and the second connecting end, the resistor units between the fourth connecting end and the first connecting end in one-to-one correspondence are arranged adjacent to the resistor units between the fourth connecting end and the second connecting end, and the distance between the resistor units and the resistor units is smaller than a preset value.
In a second aspect, an embodiment of the present invention provides a display panel, including the pressure sensor according to the first aspect.
In a third aspect, an embodiment of the present invention provides a display device, including the display panel of the second aspect.
The pressure sensor provided by the embodiment of the invention comprises at least one pressure sensing unit, wherein a first connecting end and a second connecting end of the pressure sensing unit are respectively and electrically connected with a bias voltage circuit, a third connecting end and a fourth connecting end are respectively and electrically connected with a voltage detection circuit, the first connecting end, the second connecting end, the third connecting end and the fourth connecting end form a Wheatstone bridge, and a resistor is connected in series between the first connecting end, the second connecting end, the third connecting end and the fourth connecting end, or the third connecting end, the plurality of resistance units between the first connecting ends and the plurality of resistance units between the third connecting end and the second connecting end are in one-to-one correspondence, the plurality of resistance units between the fourth connecting end and the first connecting end are in one-to-one correspondence with the plurality of resistance units between the fourth connecting end and the second connecting end, the one-to-one correspondence resistance units are adjacently arranged and have a distance smaller than a preset value, namely, the one-to-one correspondence resistance units have the same temperature, so that the resistance units between the one-to-one correspondence first connecting end and the third connecting end have the same temperature as the resistance units between the first connecting end and the fourth connecting end, and the one-to-one correspondence second connecting end and the resistance units between the one-to-third connecting end have the same temperature as the resistance units between the second connecting end and the fourth connecting end, thereby reducing the influence of the temperature on the pressure, the detection precision of the pressure sensor is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pressure sensing unit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention;
FIG. 3 is an enlarged schematic structural view of another pressure sensing unit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another pressure sensing unit according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another pressure sensing unit according to an embodiment of the present invention;
fig. 6 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present invention;
FIG. 7 is a schematic top view illustrating another display panel according to an embodiment of the present invention;
FIG. 8 is a schematic top view illustrating another display panel according to an embodiment of the present invention;
fig. 9 is a schematic top view illustrating a display panel according to an embodiment of the present invention;
FIG. 10 is a schematic top view illustrating another display panel according to an embodiment of the present invention;
FIG. 11 is an enlarged schematic view of the pressure sensing unit of FIG. 10;
FIG. 12 is a schematic top view illustrating another display panel according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As a result of intensive studies, the applicant found that in the conventional design, the pressure sensing unit in the pressure sensor is generally formed into a wheatstone bridge, and the output signal value of the wheatstone bridge is related to the magnitude of the deformation amount generated when the display panel is subjected to the pressure, but the resistances constituting the wheatstone bridge are in different temperature regions, so that the output signal value of the wheatstone bridge is also affected by the temperature, and the temperature affects the detection accuracy of the pressure sensor. Based on the above findings, the present application adopts the following technical solutions.
Fig. 1 is a schematic structural diagram of a pressure sensing unit according to an embodiment of the present invention, as shown in fig. 1, the pressure sensing unit includes four resistors, which are a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, the four resistors of the pressure sensing unit are connected to form a wheatstone bridge, each resistor is located on one arm of the wheatstone bridge, a first end of the first resistor R1 and a first end of the fourth resistor R4 are electrically connected to form a first connection end D1, a second end of the second resistor R2 and a second end of the third resistor R3 are electrically connected to form a second connection end D2, a second end of the first resistor R1 and a first end of the second resistor R2 are electrically connected to form a third connection end S1, and a second end of the fourth resistor R4 and a first end of the third resistor R3 are electrically connected to form a fourth connection end S2. The first connection terminal D1 and the second connection terminal D2 are electrically connected to a bias voltage circuit, respectively, for inputting a bias voltage signal to the pressure sensing unit, and the third connection terminal S1 and the fourth connection terminal S2 are electrically connected to a voltage detection circuit, respectively, for outputting a pressure detection signal from the pressure sensing unit. When RR is satisfied12＝RR43However, since the resistors (including the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4) constituting the wheatstone bridge are in different temperature regions, which results in an unbalance (also referred to as zero shift) of the bridge, the output signal value of the wheatstone bridge is also affected by temperature, and the temperature affects the detection accuracy of the pressure sensor.
Fig. 2 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention, and fig. 3 is an enlarged schematic structural diagram of another pressure sensing unit according to an embodiment of the present invention, as shown in fig. 2 and fig. 3, the pressure sensor includes at least one pressure sensing unit 20 (the pressure sensor in fig. 2 exemplarily includes one pressure sensing unit 20), the pressure sensing unit 20 is located on one side of a substrate 10, and the substrate 10 may be a rigid substrate or a flexible substrate. The arrows in fig. 2 are an enlarged schematic structural diagram of the pressure sensing unit 20, the pressure sensing unit 20 includes a first connection end D1, a second connection end D2, a third connection end S1 and a fourth connection end S2, the first connection end D1 and the second connection end D2 are respectively electrically connected to a bias voltage circuit (not shown in the figure), the third connection end S1 and the fourth connection end S2 are respectively electrically connected to a voltage detection circuit (not shown in the figure), and the first connection end D1, the second connection end D2, the third connection end S1 and the fourth connection end S2 form a wheatstone bridge; the pressure sensing unit 20 includes four resistors, each of which is electrically connected between two of the first connection terminal D1, the second connection terminal D2, the third connection terminal S1 and the fourth connection terminal S2, and each of which includes a plurality of resistor units connected in series; the plurality of resistor units between the first connection end D1 and the third connection end S1 correspond to the plurality of resistor units between the first connection end D1 and the fourth connection end S2 one to one. The resistor units between the first connection end D1 and the third connection end S1 which are in one-to-one correspondence are arranged adjacent to the resistor units between the first connection end D1 and the fourth connection end S2, and the distance between the resistor units and the first connection end D1 and the third connection end S1 is smaller than a preset value. The plurality of resistor units between the second connection terminal D2 and the third connection terminal S1 correspond to the plurality of resistor units between the second connection terminal D2 and the fourth connection terminal S2 one to one. The resistor units between the second connection end D2 and the third connection end S1, which are in one-to-one correspondence, are adjacent to the resistor units between the second connection end D2 and the fourth connection end S2, and the distance between the resistor units and the resistor units is smaller than a preset value. Or the plurality of resistor units between the third connection end S1 and the first connection end D1 correspond to the plurality of resistor units between the third connection end S1 and the second connection end D2 one by one, and the resistor units between the third connection end S1 and the first connection end D1 corresponding to one by one are arranged adjacent to the resistor units between the third connection end S1 and the second connection end D2, and the distance between the resistor units is smaller than a preset value; the plurality of resistor units between the fourth connection end S2 and the first connection end D1 are in one-to-one correspondence with the plurality of resistor units between the fourth connection end S2 and the second connection end D2, and the resistor units between the one-to-one correspondence fourth connection end S2 and the first connection end D1 are adjacent to the resistor units between the fourth connection end S2 and the second connection end D2, and the distance between the resistor units and the resistor units is smaller than a preset value.
Specifically, referring to fig. 1, 2, and 3, the first resistor R1 includes two resistor units (a resistor unit R1a and a resistor unit R1b) connected in series, the second resistor R2 includes two resistor units (a resistor unit R2a and a resistor unit R2b) connected in series, the third resistor R3 includes two resistor units (a resistor unit R3a and a resistor unit R3b) connected in series, and the fourth resistor R4 includes two resistor units (a resistor unit R4a and a resistor unit R4b) connected in series. In one embodiment, as shown in fig. 2, the resistor unit R1a corresponds to the resistor unit R2a, the resistor unit R1b corresponds to the resistor unit R2b, the resistor unit R3a corresponds to the resistor unit R4a, the resistor unit R3b corresponds to the resistor unit R4b, the one-to-one corresponding resistor units are adjacently disposed and have a distance less than a predetermined value, that is, the one-to-one corresponding resistor units have the same temperature, and the temperature is calculated according to the formula
It can be seen that when the pressure sensing unit adopts the structure shown in fig. 2, the resistors R1 and R2 are equally affected by temperature, and the resistors R3 and R4 are equally affected by temperature, so that the bridge is in an equilibrium state. In another embodiment, as shown in fig. 3, the resistor unit R1a corresponds to the resistor unit R4a, the resistor unit R1b corresponds to the resistor unit R4b, the resistor unit R2a corresponds to the resistor unit R3a, and the resistor unit R2b corresponds to the resistor unit R3b, the one-to-one corresponding resistor units are adjacently disposed and have a distance less than a predetermined value, i.e., the one-to-one corresponding resistor units have the same temperature, and the temperature is calculated according to the formula
It can be seen that when the pressure sensing unit adopts the structure shown in fig. 3, the resistors R1 and R4 are affected by the same temperature, and the resistors R2 and R3 are affected by the same temperature, so that the bridge is in an equilibrium state, and the influence of the temperature on the pressure sensor (including the pressure sensing unit) is reduced.
The pressure sensor provided by the embodiment of the invention comprises at least one pressure sensing unit, wherein a first connecting end and a second connecting end of the pressure sensing unit are respectively and electrically connected with a bias voltage circuit, a third connecting end and a fourth connecting end are respectively and electrically connected with a voltage detection circuit, the first connecting end, the second connecting end, the third connecting end and the fourth connecting end form a Wheatstone bridge, and a resistor is connected in series between the first connecting end, the second connecting end, the third connecting end and the fourth connecting end, or the third connecting end, the plurality of resistance units between the first connecting ends and the plurality of resistance units between the third connecting end and the second connecting end are in one-to-one correspondence, the plurality of resistance units between the fourth connecting end and the first connecting end are in one-to-one correspondence with the plurality of resistance units between the fourth connecting end and the second connecting end, the one-to-one correspondence resistance units are adjacently arranged and have a distance smaller than a preset value, namely, the one-to-one correspondence resistance units have the same temperature, so that the resistance units between the one-to-one correspondence first connecting end and the third connecting end have the same temperature as the resistance units between the first connecting end and the fourth connecting end, and the one-to-one correspondence second connecting end and the resistance units between the one-to-third connecting end have the same temperature as the resistance units between the second connecting end and the fourth connecting end, thereby reducing the influence of the temperature on the pressure, the detection precision of the pressure sensor is improved.
Alternatively, referring to fig. 2 and 3, the resistance unit is a bulk resistance. The resistor units between the first connecting end D1 and the third connecting end S1 which are in one-to-one correspondence are arranged in parallel with the resistor units between the first connecting end D1 and the fourth connecting end S2; the resistor units between the second connection terminal D2 and the third connection terminal S1, which are in one-to-one correspondence, are arranged in parallel with the resistor units between the second connection terminal D2 and the fourth connection terminal S2. Or the resistor units between the third connection end S1 and the first connection end D1 which are in one-to-one correspondence are arranged in parallel with the resistor units between the third connection end S1 and the second connection end D2; the resistor units between the fourth connection end S2 and the first connection end D1 which are in one-to-one correspondence are arranged in parallel with the resistor units between the fourth connection end S2 and the second connection end D2.
Specifically, referring to fig. 2, the resistance unit R1a and the resistance unit R2a are disposed in parallel, the resistance unit R1b and the resistance unit R2b are disposed in parallel, the resistance unit R3a and the resistance unit R4a are disposed in parallel, and the resistance unit R3b and the resistance unit R4b are disposed in parallel; referring to fig. 3, the resistance unit R1a and the resistance unit R4a are disposed in parallel, the resistance unit R1b and the resistance unit R4b are disposed in parallel, the resistance unit R2a and the resistance unit R3a are disposed in parallel, and the resistance unit R2b and the resistance unit R3b are disposed in parallel.
Fig. 4 and 5 are schematic structural diagrams of two other pressure sensing units provided by the embodiment of the invention, and as shown in fig. 4 and 5, the resistance unit has a serpentine shape. The extension paths of the resistor units between the first connection end D1 and the third connection end S1 which are in one-to-one correspondence are the same as the extension paths of the resistor units between the first connection end D1 and the fourth connection end S2; the extension paths of the resistor units between the second connection terminal D2 and the third connection terminal S1 corresponding to each other are the same as those of the resistor units between the second connection terminal D2 and the fourth connection terminal S2. Or the extension paths of the resistor units between the third connection end S1 and the first connection end D1 corresponding to each other are the same as the extension paths of the resistor units between the third connection end S1 and the second connection end D2; the extension paths of the resistor units between the fourth connection terminal S2 and the first connection terminal D1 corresponding to each other are the same as those of the resistor units between the fourth connection terminal S2 and the second connection terminal D2.
Specifically, referring to fig. 4, the extension paths of the resistor unit R1a and the resistor unit R2a are the same, the extension paths of the resistor unit R1b and the resistor unit R2b are the same, the extension paths of the resistor unit R3a and the resistor unit R4a are the same, and the extension paths of the resistor unit R3b and the resistor unit R4b are the same. Referring to fig. 5, the extension paths of the resistor unit R1a and the resistor unit R4a are the same, the extension paths of the resistor unit R1b and the resistor unit R4b are the same, the extension paths of the resistor unit R2a and the resistor unit R3a are the same, and the extension paths of the resistor unit R2b and the resistor unit R3b are the same.
An embodiment of the present invention provides a display panel, including the pressure sensor described in the above embodiments, where the pressure sensor includes at least one pressure sensing unit. Since the display panel adopts the pressure sensor, the display panel also has the beneficial effects of the pressure sensor of the embodiment.
Fig. 6 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present invention, as shown in fig. 6, the display panel further includes a thin film transistor array layer 21, an anode 221, a light emitting function layer 222, and a cathode 223 sequentially stacked, the thin film transistor array layer 21 includes a plurality of thin film transistors 211, each thin film transistor 211 includes a gate 213, an active layer 214, a source 212, and a drain 215, and a resistor unit (not shown in fig. 6) is disposed in the same layer as the anode 221, the cathode 223, the gate 213, the source 212, the drain 215, or the active layer 214. The resistor unit may be formed in the same process step as the anode 221, the cathode 223, the gate 213, the source 212, or the drain 215 when they are disposed on the same layer, and the material of the resistor unit may include metal. When the resistor unit and the active layer 214 are disposed on the same layer, the same process may be used to form the resistor unit, and the material of the resistor unit includes monocrystalline silicon or polycrystalline silicon. The resistance unit of the pressure sensing unit is made of the same material as the original film layer of the display panel, so that the manufacturing process of the display panel can be simplified, and the manufacturing process is saved.
Alternatively, the display panel may include 2-20 pressure sensing units so as to be able to detect a pressure value at any position of the entire display panel and so that the pressure sensing units do not occupy too much non-display area and cause a cost rise of the display panel due to redundancy.
Fig. 7 and 8 are schematic top view structures of two other display panels according to embodiments of the present invention, and referring to fig. 7 and 8, the display panel is rectangular, and includes 6 or 8 pressure sensing units 20, and the pressure sensing units 20 located at two long sides of the rectangle are symmetrically distributed. It can be understood that, the deformation amount that can be sensed by the pressure sensing unit closer to the pressing point is larger, and the deformation amount that can be sensed by the pressure sensing unit farther from the pressing point is smaller, but too many pressure sensing units occupy too many non-display areas and cause a cost increase of the display panel, so on the basis that the display panel includes 2-20 pressure sensing units, in order to enable the pressure sensing unit to sufficiently sense the deformation of the display panel, 6 or 8 pressure sensing units may be uniformly distributed on both sides of the long side of the display panel.
Fig. 9 is a schematic top view of a display panel according to an embodiment of the present invention, as shown in fig. 9, the display panel includes a display area 11 and a non-display area 12 surrounding the display area 11, the display panel is rectangular, and the pressure sensing unit is located in the non-display area 12 and at a long side of the rectangle. A technician typically sets the driving circuit and the signal processing circuit of the pressure sensing unit together with the driving IC, the flexible circuit board, and the like at one short side of the display panel, and thus there is not enough space to accommodate the pressure sensing unit; if the pressure sensing unit is arranged at the other short side opposite to the structures of the driving IC, the flexible circuit board and the like, a long connecting line needs to be arranged to connect the pressure sensing unit, the driving circuit and the signal processing circuit of the pressure sensing unit, and the connecting line needs to pass through the short sides of the two display panels and the long side of one display panel, so that the wiring is complex, and the pressure sensing unit can be arranged at one side of the long side of the display panel to simplify the wiring on the basis of a narrow frame.
The pressure sensing units in the pressure sensor are generally formed into a wheatstone bridge, and the output signal value of the wheatstone bridge is related to the magnitude of the deformation amount occurring when the display panel is subjected to pressure, but the deformation amount of the display panel is obviously different at each position, for example, referring to fig. 9, if a certain pressure is applied at the center of the display panel (a dotted circle in fig. 9), the magnitude of the deformation amount of the deformation of the display panel is as shown by a curve in an XY coordinate system in fig. 9, wherein an X axis is along a second direction, i.e., along a long side direction of the display panel, the X axis represents a length, a Y axis is along a first direction, and the Y axis represents the deformation amount of the display panel.
Alternatively, referring to fig. 9, a direction parallel to the short side of the rectangle is a first direction, a direction parallel to the long side of the rectangle is a second direction, the display panel is sequentially divided into a plurality of strain regions along the second direction (illustrated by taking 3 strain regions as an example in fig. 9), a boundary line between any two of the plurality of strain regions extends along the first direction, the plurality of strain regions includes at least three regions, and the at least one pressure sensing unit is located in at least two of the plurality of strain regions. In the embodiment of the present invention, at least one pressure sensing unit is located in at least two of the plurality of strain regions at the same time, and the pressure sensing units located in the plurality of strain regions simultaneously sense the deformation of different portions of the display panel, and since the larger the deformation amount of the display panel is, the larger the output signal value of the pressure sensing unit is, the more "medium" the pressure sensing units located in the plurality of strain regions at the same time are, it can be understood that the more the pressure sensing units located in the plurality of strain regions at the same time are, the smaller the difference between the output signal values of the pressure sensing units of the display panel is, and the better the uniformity is.
Fig. 10 is a schematic top view illustrating a pressure sensing unit of fig. 10, and fig. 11 is an enlarged schematic structural diagram of the pressure sensing unit of fig. 10, and with reference to fig. 10 and 11, the display panel has a rectangular shape, a long side of the rectangular shape has a length L, an area having a distance of L/8 or less from one short side of the rectangular shape is a first strain area Q1, an area having a distance of L/8 or more from the short side, and an area having a distance of 3L/8 or less is a second strain area Q2; a region which is more than 3L/8 of the short side and less than or equal to 5L/8 is a third strain region Q3; a region which is more than 5L/8 and less than or equal to 7L/8 away from the short side is a fourth strain region Q4; the region at a distance greater than 7L/8 from the short side is a fifth strain region Q5.
Alternatively, referring to fig. 10 and 11, each pressure sensing unit includes two portions, namely a first portion 201 and a second portion 202, a plurality of resistor units between the third connection end S1 and the first connection end D1 and a plurality of resistor units between the third connection end S1 and the second connection end D2 constitute the first portion 201, and a plurality of resistor units between the fourth connection end S2 and the first connection end D1 and a plurality of resistor units between the fourth connection end S2 and the second connection end D2 constitute the second portion 202. Specifically, the resistance unit R1a, the resistance unit R2a, the resistance unit R1b, and the resistance unit R2b constitute the first portion 201; the resistance unit R3a, the resistance unit R4a, the resistance unit R3b, and the resistance unit R4b constitute the second portion 202. It is understood that in other embodiments, a plurality of resistor units between the first connection end D1 and the third connection end S1 and a plurality of resistor units between the first connection end D1 and the fourth connection end S2 may be arranged to form the first portion 201, a plurality of resistor units between the second connection end D2 and the third connection end S1 and a plurality of resistor units between the second connection end D2 and the fourth connection end S2 may be arranged to form the second portion 202, that is, the resistor unit R1a, the resistor unit R4a, the resistor unit R1b, and the resistor unit R4b may be arranged to form the first portion 201; the resistance unit R2a, the resistance unit R3a, the resistance unit R2b, and the resistance unit R3b constitute the second portion 202. The display panel includes 6 pressure sensing units 20, and the pressure sensing units located at two long sides of the rectangle are symmetrically distributed, and any one of the pressure sensing units 20 is simultaneously located in three adjacent ones of the first strain region Q1, the second strain region Q2, the third strain region Q3, the fourth strain region Q4 and the fifth strain region Q5, and the first portion 201 and the second portion 202 of the pressure sensing unit 20 located in three adjacent ones of the first strain region Q1, the second strain region Q2, the third strain region Q3, the fourth strain region Q4 and the fifth strain region Q5 are simultaneously located in two non-adjacent strain regions.
Specifically, referring to fig. 10 and 11, the display panel includes six pressure sensing units 20, respectively, a first pressure sensing unit 1, a second pressure sensing unit 2, a third pressure sensing unit 3, a fourth pressure sensing unit 4, a fifth pressure sensing unit 5, and a sixth pressure sensing unit 6. The first portions 201 of the first and fourth pressure sensing units 1 and 4 are located at the first strain region Q1, the second portions 202 of the first and fourth pressure sensing units 1 and 4 are located at the third strain region Q3, the first portions 201 of the second and fifth pressure sensing units 2 and 5 are located at the second strain region Q2, the second portions 202 of the second and fifth pressure sensing units 2 and 5 are located at the fourth strain region Q4, the first portions 201 of the third and sixth pressure sensing units 3 and 6 are located at the third strain region Q3, and the second portions 202 of the third and sixth pressure sensing units 3 and 6 are located at the fifth strain region Q5. For example, if a certain pressure is applied to the center of the display panel, the deformation amount of the display panel in the third strain region Q3 is the largest (strong region), the deformation amount of the display panel in the second strain region Q2 and the fourth strain region Q4 is the second (middle region), and the deformation amount of the display panel in the first strain region Q1 and the fifth strain region Q5 is the smallest (weak region), and a pressure sensing unit is located in both the strong region and the weak region or in the middle region, and generally all the pressure sensing units are closely affected by the deformation amount of the display panel, so that the difference of the output signal values of the pressure sensing units of the display panel is small and the uniformity is good. It should be noted that the strong region, the middle region and the weak region are only an intuitive expression of the deformation amount of the display panel when a certain pressure is applied at the center of the display panel, in fact, when a pressing force is applied at other positions in the display panel, the pressing force becomes the strong region, the position farthest from the pressing becomes the weak region, and the positions of the first part and the second part of the pressure sensing unit can be interchanged without affecting the magnitude of the signal output value of the pressure sensing unit.
It should be noted that, the pressure sensing units in the display panel are all given by the resistor units in a serpentine shape, which is not a limitation of the present invention, and the pressure sensing units in the display panel may also be bulk resistors.
In addition, the shape of the display panel in the embodiments of the present application is illustrated by a rectangle, and should not be construed as a limitation to the present application. In other implementations of the present application, the display panel may also be oval, circular, polygonal, racetrack-shaped, etc., and all feasible modifications that do not depart from the core protection concept of the embodiments of the present application are within the scope of the present application.
Fig. 12 is a schematic top view of another display panel according to an embodiment of the present invention, and as shown in fig. 12, the display panel includes a display area 11 and a non-display area 12 surrounding the display area 11, and the display panel further includes a touch functional layer 30, where the touch functional layer 30 is located in the display area 11 and used for detecting a touch position. The touch functional layer 30 may specifically include a plurality of mutually independent self-capacitance touch electrode blocks, each of which forms a capacitance with, for example, a zero potential point ground, and when a finger touches or approaches the display panel, a capacitance value at a touch position is increased, and then, when performing touch detection, the position of the touch point may be determined by detecting a change in a corresponding capacitance value. Alternatively, the touch electrode layer 30 includes a touch driving electrode and a touch sensing electrode, a mutual capacitance (coupling capacitance) may be formed at a crossing position of the touch sensing electrode and the touch driving electrode, when a human body contacts the display panel, a capacitance connected in series with the mutual capacitance is formed between the finger and the capacitive screen due to grounding of the human body, and thus the capacitance detected by the touch sensing electrode is reduced and a corresponding touch sensing signal may be generated, and thus a specific touch occurrence position may be determined through corresponding conversion.
Fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 13, the display device according to the embodiment includes any one of the display panels described above. Since the display device adopts the display panel, the display device also has the beneficial effects of the display panel of the embodiment. It should be noted that the display device provided in the embodiment of the present invention may further include other circuits and devices for supporting normal operation of the display device. The display device can be one of a mobile phone, a tablet personal computer, electronic paper and an electronic photo frame.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A display panel comprising a pressure sensor; the pressure sensor includes:
the pressure sensing unit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end and the second connecting end are respectively and electrically connected with a bias voltage circuit, the third connecting end and the fourth connecting end are respectively and electrically connected with a voltage detection circuit, and the first connecting end, the second connecting end, the third connecting end and the fourth connecting end form a Wheatstone bridge;
the pressure sensing unit comprises four resistors, each resistor is electrically connected between the first connecting end and the fourth connecting end, the second connecting end and the third connecting end, and each resistor comprises a plurality of resistor units connected in series;
the plurality of resistance units between the first connecting end and the third connecting end are in one-to-one correspondence with the plurality of resistance units between the first connecting end and the fourth connecting end, the resistance units between the first connecting end and the third connecting end which are in one-to-one correspondence are arranged adjacent to the resistance units between the first connecting end and the fourth connecting end, and the distance between the resistance units is smaller than a preset value; the plurality of resistor units between the second connecting end and the third connecting end are in one-to-one correspondence with the plurality of resistor units between the second connecting end and the fourth connecting end, the resistor units between the second connecting end and the third connecting end which are in one-to-one correspondence are arranged adjacent to the resistor units between the second connecting end and the fourth connecting end, and the distance between the resistor units is smaller than a preset value; alternatively, the first and second electrodes may be,
the third connecting end and the plurality of resistor units between the first connecting ends are in one-to-one correspondence with the plurality of resistor units between the third connecting end and the second connecting end, the resistor units between the third connecting end and the first connecting end which are in one-to-one correspondence are arranged adjacent to the resistor units between the third connecting end and the second connecting end, and the distance between the resistor units is smaller than a preset value; the fourth connecting end and the plurality of resistor units between the first connecting ends are in one-to-one correspondence with the plurality of resistor units between the fourth connecting end and the second connecting end, the resistor units between the fourth connecting end and the first connecting end which are in one-to-one correspondence are arranged adjacent to the resistor units between the fourth connecting end and the second connecting end, and the distance between the resistor units is smaller than a preset value;
the resistance unit is in a snake shape; the extension paths of the resistor units between the first connecting end and the third connecting end which are in one-to-one correspondence are the same as the extension paths of the resistor units between the first connecting end and the fourth connecting end; the extension paths of the resistor units between the second connecting end and the third connecting end which are in one-to-one correspondence are the same as the extension paths of the resistor units between the second connecting end and the fourth connecting end; or the extension paths of the resistor units between the third connecting end and the first connecting end which are in one-to-one correspondence are the same as the extension paths of the resistor units between the first connecting end and the fourth connecting end; the extension paths of the resistor units between the second connecting end and the third connecting end which are in one-to-one correspondence are the same as the extension paths of the resistor units between the second connecting end and the fourth connecting end;
the display panel comprises a display area and a non-display area surrounding the display area, the display panel is rectangular, and the pressure sensing unit is located in the non-display area and at the long edge of the rectangle;
the direction parallel to the short side of the rectangle is a first direction, the direction parallel to the long side of the rectangle is a second direction, the display panel is sequentially divided into a plurality of strain areas along the second direction, an intersection line between any two of the plurality of strain areas extends along the first direction, and the plurality of strain areas comprise at least three areas;
at least one of the pressure sensing cells is located in at least two of the plurality of strain regions simultaneously.
2. The display panel according to claim 1, further comprising a thin film transistor array layer, an anode, a light emitting function layer, and a cathode, which are sequentially stacked, wherein the thin film transistor array layer comprises a plurality of thin film transistors, and the thin film transistors comprise a gate electrode, an active layer, a source electrode, and a drain electrode; the resistance unit is arranged on the same layer as the anode, the cathode, the gate, the source, the drain or the active layer.
3. The display panel according to claim 1, comprising 2 to 20 of the pressure sensing units.
4. The display panel according to claim 1, wherein the display panel comprises 6 or 8 pressure sensing units, and the pressure sensing units at two long sides of the rectangle are symmetrically distributed.
5. The display panel according to claim 1, wherein the long side of the rectangle has a length L;
an area which is less than or equal to L/8 away from one short side of the rectangle is a first strain area, an area which is more than L/8 away from the short side and less than or equal to 3L/8 away from the short side is a second strain area; the distance between the short side and the short side is more than 3L/8, and the area which is less than or equal to 5L/8 is a third strain area; the distance between the short side and the short side is more than 5L/8, and the area which is less than or equal to 7L/8 is a fourth strain area; and the area with the distance from the short side larger than 7L/8 is a fifth strain area.
6. The display panel according to claim 5, wherein each of the pressure sensing units comprises two portions, a first portion and a second portion; the plurality of resistor units between the first connecting end and the third connecting end and the plurality of resistor units between the first connecting end and the fourth connecting end form the first part, and the plurality of resistor units between the second connecting end and the third connecting end and the plurality of resistor units between the second connecting end and the fourth connecting end form the second part; or the first part is composed of the third connecting end, the plurality of resistance units between the first connecting ends, the third connecting end and the second connecting end, and the second part is composed of the fourth connecting end, the plurality of resistance units between the first connecting ends, the fourth connecting end and the second connecting end;
the display panel comprises 6 pressure sensing units, and the pressure sensing units positioned on two long sides of the rectangle are symmetrically distributed;
any one of the pressure sensing units is simultaneously positioned in adjacent three of the first strain area, the second strain area, the third strain area, the fourth strain area and the fifth strain area; and the first portion and the second portion of the pressure sensing unit, which are simultaneously located in adjacent three of the first strain region, the second strain region, the third strain region, the fourth strain region and the fifth strain region, are located in two non-adjacent strain regions.
7. The display panel according to any one of claims 1 to 6, wherein the display panel comprises a display area and a non-display area surrounding the display area;
the display panel further comprises a touch functional layer, and the touch functional layer is located in the display area and used for detecting a touch position.
8. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
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