CN107643621B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107643621B CN107643621B CN201711072095.8A CN201711072095A CN107643621B CN 107643621 B CN107643621 B CN 107643621B CN 201711072095 A CN201711072095 A CN 201711072095A CN 107643621 B CN107643621 B CN 107643621B
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Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises a frame rubber structure and a plurality of pressure sensors, a first resistor first end and a fourth resistor first end of each pressure sensor are connected with a first power supply signal input end, a first resistor second end and a second resistor first end are connected with a first sensing signal output end, a fourth resistor second end and a third resistor first end are connected with a second sensing signal output end, and a second resistor second end and a third resistor second end are electrically connected with a second power supply signal input end; any two adjacent resistors in the first resistor, the second resistor and the fourth resistor are constant value resistors, and the other two resistors are piezoresistors; at least part of the constant value resistors are positioned in the peripheral circuit area, and the distance from the constant value resistors to the corresponding frame glue structure is smaller than the distance from the pressure sensitive resistor to the corresponding frame glue structure; the frame glue structure is at least partially overlapped with the vertical projection of the constant value resistor on the first substrate. By the technical scheme, the probability that the frame glue structure covers the piezoresistor is reduced, and the width of a peripheral circuit area is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
At present, a display panel with a touch function is widely used as an information input tool in various electronic devices, such as an information query machine in a hall of a public place, a computer and a mobile phone used by a user in daily life and work. Therefore, the user can operate the electronic equipment by only touching the mark on the touch display screen with fingers, dependence of the user on other input equipment such as a keyboard and a mouse is eliminated, and man-machine interaction is more direct, simple and convenient. In order to better meet the user requirements, a pressure sensor for detecting the touch pressure of a user in the process of touching the touch display screen is usually arranged in the touch display screen, and the pressure sensor can acquire touch position information and also can acquire the size of the touch pressure, so that the application range of the touch display technology is enriched.
The display panel with pressure detection function generally integrates a pressure sensor arranged in a peripheral circuit area of the display panel, and the display panel generally further comprises a frame adhesive structure arranged around the display area in the peripheral circuit area, wherein the pressure sensor is positioned in a space formed by the frame adhesive structure and the display area. In the process of manufacturing the display panel, due to the influence of the coating precision of the frame adhesive structure, part of the frame adhesive structure covers part of the pressure sensor in the coating process, and the frame adhesive structure can counteract part of the pressure of the touch main body on the pressure sensor, so that the accuracy of pressure detection performed by the pressure sensor is seriously influenced.
Disclosure of Invention
In view of the above, the present invention provides a display panel and a display device, where any two adjacent resistors among first to fourth resistors in a pressure sensor are configured as fixed value resistors, the other two resistors are voltage dependent resistors, at least a part of the fixed value resistors are located in a peripheral circuit region, and a distance from the fixed value resistor in the pressure sensor to a sealant structure closest to the pressure sensor is smaller than a distance from the voltage dependent resistor in the pressure sensor to the sealant structure closest to the pressure sensor, that is, the fixed value resistor in the pressure sensor is arranged close to the corresponding sealant structure, and the voltage dependent resistor is arranged away from the corresponding sealant structure, so that a probability that the sealant structure covers the voltage dependent resistor in the pressure sensor is greatly reduced, and an influence of the sealant structure on a pressure detection process of the pressure sensor is reduced. In addition, the vertical projection of the frame glue structure on the first substrate and the vertical projection of the fixed-value resistor on the first substrate are at least partially overlapped, so that the width of a peripheral circuit area of the display panel is reduced, and the realization of a narrow frame of the display panel is facilitated.
In a first aspect, an embodiment of the present invention provides a display panel, including a display area and a peripheral circuit area surrounding the display area;
the frame glue structure is positioned in the peripheral circuit area and arranged around the display area;
the frame glue structure is positioned between the first substrate and the second substrate;
a plurality of pressure sensors, each of the pressure sensors including a first resistor, a second resistor, a third resistor, and a fourth resistor, and a first power signal input, a second power signal input, a first sensing signal output, and a second sensing signal output; a first end of the first resistor and a first end of the fourth resistor are electrically connected with the first power supply signal input end, a second end of the first resistor and a first end of the second resistor are electrically connected with the first sensing signal output end, a second end of the fourth resistor and a first end of the third resistor are electrically connected with the second sensing signal output end, and a second end of the second resistor and a second end of the third resistor are electrically connected with the second power supply signal input end;
wherein the first resistance, the second resistance, the third resistance, and the fourth resistance in the pressure sensor satisfy any one of the following conditions:
the first resistor and the second resistor are constant value resistors, and the third resistor and the fourth resistor are piezoresistors;
or the second resistor and the third resistor are constant resistors, and the first resistor and the fourth resistor are piezoresistors;
or the third resistor and the fourth resistor are constant value resistors, and the first resistor and the second resistor are piezoresistors;
or the first resistor and the fourth resistor are constant value resistors, and the second resistor and the third resistor are piezoresistors;
at least part of the fixed value resistor is positioned in the peripheral circuit area, and the distance from the fixed value resistor in the pressure sensor to the frame adhesive structure closest to the pressure sensor is smaller than the distance from the pressure sensitive resistor in the pressure sensor to the frame adhesive structure closest to the pressure sensor;
the vertical projection of the frame glue structure on the first substrate is at least partially overlapped with the vertical projection of the constant value resistor on the first substrate.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel according to the first aspect.
The embodiment of the invention provides a display panel and a display device, wherein any two adjacent resistors in a first resistor, a second resistor, a third resistor and a fourth resistor in a pressure sensor are set to be constant value resistors, the other two resistors are piezoresistors, at least part of the constant value resistors are positioned in a peripheral circuit area, and the distance from the constant value resistors in the pressure sensor to a frame rubber structure closest to the pressure sensor is smaller than the distance from the piezoresistors in the pressure sensor to the frame rubber structure closest to the pressure sensor, namely the constant value resistors in the pressure sensor are arranged close to the corresponding frame rubber structure, the piezoresistors are arranged far away from the corresponding frame rubber structure, the probability that the frame rubber structure covers the piezoresistors in the pressure sensor is greatly reduced, the pressure detection value of the pressure sensor depends on the deformation of the piezoresistors, and the constant value resistors cannot influence the pressure detection value of the pressure sensor, therefore, the probability that the frame glue structure covers the piezoresistor in the pressure sensor is reduced. And then the influence of the frame glue structure on the pressure detection process of the pressure sensor is reduced. In addition, at least partial overlap of the vertical projection of the frame glue structure on the first substrate and the vertical projection of the fixed-value resistor on the first substrate is set, and the vertical projection of the frame glue structure on the first substrate and the vertical projection of the fixed-value resistor on the array substrate are not overlapped, so that the width of a peripheral circuit area of the display panel is reduced, and the realization of a narrow frame of the display panel is facilitated.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view along the direction AA' in FIG. 1;
fig. 3 is a schematic top view of another display panel according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view taken along the direction BB' in FIG. 3;
fig. 5 is a schematic top view of another display panel according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view taken along the direction CC' in FIG. 5;
fig. 7 is a schematic top view of another display panel according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view taken along direction DD' in FIG. 7;
FIG. 9 is a schematic cross-sectional view taken along direction EE' of FIG. 1;
fig. 10 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the invention;
fig. 11 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the invention;
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. Throughout this specification, the same or similar reference numbers refer to the same or similar structures, elements, or processes. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The embodiment of the invention provides a display panel, which comprises a display area, a peripheral circuit area surrounding the display area, a frame glue structure positioned in the peripheral circuit area, a first substrate, a second substrate and a plurality of pressure sensors, wherein the frame glue structure is oppositely arranged around the display area and positioned between the first substrate and the second substrate, each pressure sensor comprises a first resistor, a second resistor, a third resistor and a fourth resistor, a first power signal input end, a second power signal input end, a first sensing signal output end and a second sensing signal output end, the first end of the first resistor and the first end of the fourth resistor are electrically connected with the first power signal input end, the second end of the first resistor and the first end of the second resistor are electrically connected with the first sensing signal output end, the second end of the fourth resistor and the first end of the third resistor are electrically connected with the second sensing signal output end, and the second end of the second resistor and the second end of the third resistor are electrically connected with the second power supply signal input end. Wherein the first resistor, the second resistor, the third resistor and the fourth resistor in the pressure sensor satisfy any one of the following conditions:
the first resistor and the second resistor are constant value resistors, the third resistor and the fourth resistor are piezoresistors, or the second resistor and the third resistor are constant value resistors, the first resistor and the fourth resistor are piezoresistors, or the third resistor and the fourth resistor are constant value resistors, the first resistor and the second resistor are piezoresistors, or the first resistor and the fourth resistor are constant value resistors, and the second resistor and the third resistor are piezoresistors. At least part of the fixed value resistors are positioned in the peripheral circuit area, the distance from the fixed value resistors in the pressure sensors to the frame glue structure closest to the pressure sensors is smaller than the distance from the piezoresistors in the pressure sensors to the frame glue structure closest to the pressure sensors, and the vertical projection of the frame glue structure on the first substrate is at least partially overlapped with the vertical projection of the fixed value resistors on the first substrate.
The display panel with the pressure detection function is generally integrated with a pressure sensor arranged in a peripheral circuit area, the display panel generally further comprises a frame glue structure arranged around the display area in the peripheral circuit area and used for bonding a first substrate and a second substrate in the display panel, for the liquid crystal display panel, the frame glue structure can also effectively prevent liquid crystal between the first substrate and the second substrate from entering the display panel to the outside, and the pressure sensor is arranged in a space formed by the frame glue structure and the display area. In the process of manufacturing the display panel, due to the influence of the coating precision of the frame adhesive structure, part of the frame adhesive structure covers part of the pressure sensor in the coating process, and the frame adhesive structure can counteract part of the pressure of the touch main body on the pressure sensor, so that the accuracy of pressure detection performed by the pressure sensor is seriously influenced.
In the embodiment of the invention, any two adjacent resistors in the first resistor to the fourth resistor in the pressure sensor are set as constant-value resistors, the other two resistors are piezoresistors, at least part of the fixed value resistors are positioned in the peripheral circuit area, and the distance from the fixed value resistors in the pressure sensor to the frame rubber structure closest to the pressure sensor is smaller than the distance from the piezoresistors in the pressure sensor to the frame rubber structure closest to the pressure sensor, namely, the constant value resistor in the pressure sensor is arranged close to the corresponding frame glue structure, and the pressure sensitive resistor is arranged far away from the corresponding frame glue structure, thereby greatly reducing the probability that the frame glue structure covers the pressure sensitive resistor in the pressure sensor, the pressure detection value of the pressure sensor depends on the deformation of the piezoresistor, and the fixed value resistor does not influence the pressure detection value of the pressure sensor, so that the probability that the frame adhesive structure covers the piezoresistor in the pressure sensor is reduced. And then the influence of the frame glue structure on the pressure detection process of the pressure sensor is reduced. In addition, at least partial overlap of the vertical projection of the frame glue structure on the first substrate and the vertical projection of the fixed-value resistor on the first substrate is set, and the vertical projection of the frame glue structure on the first substrate and the vertical projection of the fixed-value resistor on the array substrate are not overlapped, so that the width of a peripheral circuit area of the display panel is reduced, and the realization of a narrow frame of the display panel is facilitated.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional view along the direction AA' in fig. 1. With reference to fig. 1 and fig. 2, the display panel includes a display area AA and a peripheral circuit area NAA surrounding the display area AA, and further includes a sealant structure 1 located in the peripheral circuit area NAA, a first substrate 2 and a second substrate 3 disposed opposite to each other, and a plurality of pressure sensors 4, only one pressure sensor 4 is exemplarily shown in fig. 1, and the sealant structure 1 is disposed around the display area AA and located between the first substrate 2 and the second substrate 3.
Each pressure sensor 4 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, and a first power signal input terminal a1, a second power signal input terminal a2, a first sensing signal output terminal b1, and a second sensing signal output terminal b2, a first end m1 of the first resistor R1 and a first end m4 of the fourth resistor R4 are electrically connected to the first power signal input terminal a1, a second end n1 of the first resistor R1 and a first end m2 of the second resistor R2 are electrically connected to the first sensing signal output terminal b1, a second end n4 of the fourth resistor R4 and a first end m3 of the third resistor R3 are electrically connected to the second sensing signal output terminal b2, a second end n2 of the second resistor R2 and a second end n3 of the third resistor R3 are electrically connected to the second power signal input terminal a 2. Wherein the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 in the pressure sensor 4 satisfy any one of the following conditions:
the first resistor R1 and the second resistor R2 are constant value resistors, the third resistor R3 and the fourth resistor R4 are piezoresistors, or the second resistor R2 and the third resistor R3 are constant value resistors, the first resistor R1 and the fourth resistor R4 are piezoresistors, or the third resistor R3 and the fourth resistor R4 are constant value resistors, the first resistor R1 and the second resistor R2 are piezoresistors, or the first resistor R1 and the fourth resistor R4 are constant value resistors, and the second resistor R2 and the third resistor R3 are piezoresistors, that is, any two adjacent resistors among the first to fourth resistors in the pressure sensor 4 are constant value resistors, and the other two resistors are piezoresistors, and fig. 1 and 2 exemplarily set the first resistor R1 and the fourth resistor R4 as constant value resistors, and the second resistor R2 and the third resistor R3 as piezoresistors.
With reference to fig. 1 and 2, it can be exemplarily set that the constant value resistor and the piezoresistor are both in block shapes, the material constituting the constant value resistor is a metal material, the material constituting the piezoresistor is a semiconductor material, and when the pressure sensor is subjected to the same amount of pressure, the deformation amount of the resistor made of the semiconductor material is much larger than that of the resistor made of the metal material, so that the block resistor made of the metal material can be approximately equivalent to the constant value resistor with respect to the block resistor made of the semiconductor material, and the resistor made of the semiconductor material is equivalent to the piezoresistor for determining the pressure detection value of the pressure sensor.
Specifically, when there is a certain difference between the voltages at the first power signal input terminal a1 and the second power signal input terminal a2, that is, when the first power signal input terminal a1 and the second power signal input terminal a2 input bias voltage to the pressure sensor 4, current passes through each branch in a bridge circuit formed by four resistors of the pressure sensor 4, and when the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 of the pressure sensor 4 meet the requirement that
At this time, the potentials of the first sensing signal output terminal b1 and the second sensing signal output terminal b2 are equal, and the bridge formed by the first resistor R1 to the fourth resistor R4 is in a balanced state, which is called
The bridge balance condition. Since the first resistor R1 and the fourth resistor R4 are constant resistors, the resistances of the first resistor R1 and the fourth resistor R4 do not change during the pressure detection by the pressure sensor 4. When the touch body presses the display panel, the deformation sensed by the second resistor R2 and the third resistor R3 is different, for example, the second resistor R2 may sense the tensile deformation, and the third resistor R3 may sense the compressive deformation, that is, the resistance values of R2 and R3 are different, so that the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 no longer satisfy the bridge balance condition
The potentials of the first sensing signal output terminal b1 and the second sensing signal output terminal b2 are different, and the detection of the pressure applied to the pressure sensor 4 can be realized according to the pressure detection signals output by the first sensing signal output terminal b1 and the second sensing signal output terminal b 2. Thus the first of the pressure sensors 4Any adjacent two resistors among the fourth resistors R4 are set as constant value resistors, and the other two resistors are set as pressure sensitive resistors, which do not affect the detection of the pressure by the pressure sensor 4, and the pressure sensor 4 can still detect the pressure of the touch subject pressing the display panel.
Similarly, when the first resistor R1 and the second resistor R2 are constant resistors, the resistances of the first resistor R1 and the second resistor R2 are not changed, the deformation experienced by the third resistor R3 and the fourth resistor R4 is different, and the resistances of the third resistor R3 and the fourth resistor R4 are different. When the second resistor R2 and the third resistor R3 are constant resistors, the resistances of the second resistor R2 and the third resistor R3 are not changed, the deformations experienced by the first resistor R1 and the fourth resistor R4 are different, and the resistances of the first resistor R1 and the fourth resistor R4 are different. When the third resistor R3 and the fourth resistor R4 are constant resistors, the resistances of the third resistor R3 and the fourth resistor R4 are not changed, the deformation sensed by the first resistor R1 and the deformation sensed by the second resistor R2 are different, and the resistances of the first resistor R1 and the second resistor R2 are different. The above situation can also make the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 no longer satisfy the bridge balance condition
The pressure sensor 4 detects the pressure according to the pressure detection signals output by the first sensing signal output end b1 and the second sensing signal output end b 2.
With reference to fig. 1 and fig. 2, at least a portion of the fixed resistor is disposed in the peripheral circuit area NAA, that is, at least a portion of the first resistor R1 and the fourth resistor R4 are disposed in the peripheral circuit area NAA, and the fixed resistor and the piezoresistor in the pressure sensor 4 are both disposed in the peripheral circuit area NAA, that is, the first resistor to the fourth resistor in the pressure sensor 4 are both disposed in the peripheral circuit area NAA, so as to avoid affecting the light transmittance of the display panel. A distance d1 from the fixed resistor in the pressure sensor 4 to the sealant structure 101 closest to the pressure sensor 4 is set (in fig. 2, the fixed resistor is exemplarily used, i.e. the distance between the first resistor R1 and the sealant structure 101 on the same side, such as the right side edge, represents d1), which is smaller than the distance d2 from the pressure-sensitive resistor in the pressure sensor 4 to the sealant structure 101 closest to the pressure sensor 4 (in fig. 2, the pressure-sensitive resistor is exemplarily used, i.e. the second resistor R2 and the sealant structure 101 on the same side, such as the distance between the right side edge represents d2), i.e. the fixed resistor in the pressure sensor 4 is set closer to the sealant structure 101 closest to the pressure sensor 4 than the pressure-sensitive resistor, i.e. the first resistor R1 and the fourth resistor R4 are set closer to the sealant structure 101 than the second resistor R2 and the third resistor R3, so that even if the frame coating process of the display panel 1 is shifted, the sealant structure 1 also covers the fixed-value resistors, i.e., the first resistor R1 and the fourth resistor R4, in the pressure sensor 4 closer to the corresponding sealant structure 101, so that the probability that the sealant structure 1 covers the pressure-sensitive resistors, i.e., the second resistor R2 and the third resistor R3, in the pressure sensor 4 is greatly reduced, and the pressure detection value of the pressure sensor 4 depends on the deformation of the pressure-sensitive resistors, i.e., the second resistor R2 and the third resistor R3, and the fixed-value resistors, i.e., the first resistor R1 and the fourth resistor R4 do not affect the pressure detection value of the pressure sensor 4, so that the influence of the sealant structure 1 on the pressure detection process of the pressure sensor 4 is reduced.
In addition, with reference to fig. 1 and fig. 2, at least a portion of the vertical projection of the sealant structure 1 on the first substrate 2 overlaps with the vertical projection of the fixed-value resistor on the first substrate 2, that is, at least a portion of the vertical projection of the sealant structure 1 on the first substrate 2 overlaps with the vertical projection of the first resistor R1 and the fourth resistor R4 on the first substrate 2, and compared with the case where there is no overlapping portion of the vertical projection of the sealant structure 1 on the first substrate 2 and the vertical projection of the fixed-value resistor on the first substrate 2, the fixed-value resistor located in the peripheral circuit area NAA of the display panel and the width of the peripheral circuit area NAA occupied by the sealant structure 1 are smaller, so that the width of the peripheral circuit area NAA of the display panel is reduced, which is beneficial to realizing a narrow frame of the.
Fig. 3 is a schematic top view of another display panel according to an embodiment of the present invention, and fig. 4 is a schematic cross-sectional view along the direction BB' of fig. 3. Unlike the display panel with the structure shown in fig. 1 and 2, the piezoresistors in the pressure sensor 4 are exemplarily arranged in the display area AA of the display panel in fig. 3 and 4, that is, the second resistor R2 and the third resistor R3 are arranged in the display area AA of the display panel, and the sealant structure 1 is arranged in the peripheral circuit area NAA of the display panel, so that the sealant structure 1 cannot cover the piezoresistors of the pressure sensor 4 arranged in the display area AA of the display panel, that is, the second resistor R2 and the third resistor R3, and the pressure detection value of the pressure sensor 4 depends on the piezoresistors, the deformation amounts of the second resistor R2 and the third resistor R3, the fixed-value resistors, that is, the first resistor R1 and the fourth resistor R4, do not affect the pressure detection value of the pressure sensor 4, that is ensured that the sealant structure 1 does not affect the pressure detection value of the pressure sensor 4, and the accuracy of the pressure detection performed by the pressure sensor 4 is greatly improved, and the piezoresistors in the pressure sensor 4, namely the second resistor R2 and the third resistor R3 are arranged in the display area AA of the display panel, so that the width of the pressure sensor 4 occupying the peripheral circuit area NAA of the display panel can be effectively reduced, and the realization of the narrow frame of the display panel is facilitated.
Alternatively, with reference to fig. 3 and 4, the display panel may further include a black matrix 5, and a vertical projection of the black matrix 5 on the first substrate 2 may be disposed to cover the piezoresistors, that is, a vertical projection of the second resistor R2 and the third resistor R3 on the first substrate 2. Specifically, the display panel may include a plurality of pixel units (not shown in fig. 3) arranged in a matrix, the pixel units are located in a space 51 surrounded by the black matrix 5, the black matrix 5 covers signal lines (not shown in fig. 3) electrically connected to the pixel units, such as gate lines and data lines, and the black matrix 5 corresponds to the opaque region of the display panel. Taking the outlines of the constant value resistors and the piezoresistors as blocks, the material forming the constant value resistors is a metal material, and the material forming the piezoresistors is a semiconductor material, for example, the blocky piezoresistors can be arranged, that is, the second resistor R2 and the third resistor R3 are arranged corresponding to the black matrix 5, that is, the vertical projection of the black matrix 5 on the first substrate 2 is arranged to cover the blocky piezoresistors, that is, the vertical projection of the second resistor R2 and the third resistor R3 on the first substrate 2, the distance d1 from the constant value resistor in the pressure sensor 4 to the sealant structure 101 closest to the pressure sensor 4 is smaller than the distance d2 from the piezoresistor in the pressure sensor 4 to the sealant structure 101 closest to the pressure sensor 4, and the piezoresistors are located in the display panel display area AA to reduce the influence of the sealant structure 1 on the pressure detection value of the pressure sensor 4, while the width of the peripheral circuit area NAA occupied by the pressure sensor 4 is reduced, the arrangement of the black matrix 5 prevents the piezoresistor located in the display area AA from affecting the light transmittance of the display panel.
Fig. 5 is a schematic top view of another display panel according to an embodiment of the present invention, and fig. 6 is a schematic cross-sectional view taken along direction CC' in fig. 5. Unlike the display panel having the structure shown in fig. 1 to 4, fig. 4 and 5 exemplarily set the fixed-value resistor of the pressure sensor 4, that is, the first resistor R1 and the fourth resistor R4 have block-shaped outlines, the piezoresistor, that is, the second resistor R2 and the third resistor R3 have serpentine-shaped outlines, and similarly, the fixed-value resistor, that is, the first resistor R1 and the fourth resistor R4 are made of metal materials, and the piezoresistor, that is, the second resistor R2 and the third resistor R3 are made of semiconductor materials, for the same amount of pressure applied to the pressure sensor 4, the deformation amount of the resistor made of semiconductor materials is much larger than that of the resistor made of metal materials, and the ductility of the serpentine resistor is better than that of the bulk resistor, for the same amount of pressure applied to the pressure sensor 4, the deformation amount of the serpentine resistor is much larger than that of the bulk resistor, therefore, the block resistor made of the metal material can be equivalent to a fixed value resistor relative to the serpentine resistor made of the semiconductor material, and the fixed value resistor made of the semiconductor material is a piezoresistor.
For example, the fixed resistors of the pressure sensor 4 may also be set, that is, the first resistor R1 and the fourth resistor R4 have block-shaped profiles, and the piezoresistor, that is, the second resistor R2 and the third resistor R3 have serpentine-shaped profiles, and both the fixed resistors and the piezoresistors are made of metal materials, and similarly, since the ductility of the serpentine-shaped resistor is superior to that of the block-shaped resistor, and the amount of deformation of the serpentine-shaped resistor is much greater than that of the block-shaped resistor for the same amount of pressure applied to the pressure sensor 4, the block-shaped resistor made of metal materials may be equivalent to the fixed resistor and the serpentine-shaped resistor made of metal materials may be equivalent to the piezoresistor.
The outline of the constant value resistor is in a block shape, the outline of the piezoresistor is in a snake shape, and the principle of pressure detection is the same as that of the pressure sensor 4 with the structure shown in fig. 1 to 4, and the description is omitted here. For example, in combination with fig. 5 and 6, the first resistor R1 and the fourth resistor R4 may be set as constant value resistors, the second resistor R2 and the third resistor R3 may be set as piezoresistors, the first resistor R1 and the fourth resistor R4 have a block shape, the second resistor R2 and the third resistor R3 have a serpentine shape, for example, a component of the extension length of the second resistor R2 from the first end m2 to the second end n2 in the second extension direction 200 may be set to be greater than a component of the extension length of the third resistor R3 from the first end m3 to the second end n3 in the first extension direction 100, and the extension directions 100 and 200 are set to intersect.
Specifically, the pressure sensor 4 generally requires that the piezoresistors, i.e., the second resistor R2 and the third resistor R3, sense different deformations, for example, the third resistor R3 senses compression deformation, and the second resistor R2 senses tensile deformation, so that the second resistor R2 and the third resistor R3, which serve as piezoresistors, are spatially separated, and when the local temperature changes, the second resistor R2 and the third resistor R3 are in different temperature environments, and the temperature has different influences on the second resistor R2 and the third resistor R3, which affects the accuracy of pressure detection performed by the pressure sensor 4. The contour of the piezoresistor is arranged to be in a snake shape, namely the contour of the second resistor R2 and the contour of the third resistor R3 are arranged to be in a snake shape, the pressure sensor 4 can sense the strain of the first extending direction 100 through the third resistor R3, and sense the strain of the second extending direction 200 through the second resistor R2, so that the second resistor R2 and the third resistor R3 are distributed at the same position in space, or distributed in a smaller area, and further the second resistor R2 and the third resistor R3 have synchronous temperature change, the influence of temperature difference is eliminated, and the accuracy of pressure sensing of the display panel is improved.
Similarly, with reference to fig. 5 and 6, it may be exemplarily configured that the constant value resistor and the piezoresistor of the pressure sensor 4 are both located in the peripheral circuit area NAA of the display panel, that is, the first to fourth resistors of the pressure sensor 4 are all located in the peripheral circuit area NAA of the display panel, so as to effectively prevent the influence of the pressure sensor 4 on the transmittance of the display panel, and meanwhile, by setting the constant value resistor of the pressure sensor 4 located in the peripheral circuit area NAA, that is, the distance d1 from the fourth resistor R4 to the sealant structure 101 closest to the pressure sensor 4, is smaller than the distance d2 from the piezoresistor of the pressure sensor 4, that is, the third resistor R3 to the sealant structure 101 closest to the pressure sensor 4, the influence of the sealant structure 1 also located in the peripheral circuit area NAA on the pressure detection value of the pressure sensor 4 is reduced.
For example, as shown in fig. 7 and 8, the piezoresistor of the pressure sensor 4 is disposed in the display area AA of the display panel, and the piezoresistor, that is, the outlines of the second resistor R2 and the third resistor R3 are serpentine, and the sealant structure 1 is disposed in the peripheral circuit area NAA of the display panel, so that the sealant structure 1 cannot cover the piezoresistor of the pressure sensor 4 disposed in the display area AA of the display panel, and it is ensured that the sealant structure 1 does not affect the pressure detection value of the pressure sensor 4, thereby greatly improving the accuracy of the pressure detection performed by the pressure sensor 4, and the piezoresistor in the pressure sensor 4, that is, the second resistor R2 and the third resistor R3 are disposed in the display area AA of the display panel, which can effectively reduce the width of the display panel peripheral NAA occupied by the pressure sensor 4, and is beneficial to implement a narrow frame of the display panel.
Alternatively, in conjunction with fig. 7 and 8, the display panel may further include a black matrix 5, a perpendicular projection of the black matrix 5 on the first substrate 2 may be provided to cover the piezoresistors, namely, the vertical projection of the second resistor R2 and the third resistor R3 on the first substrate 2, by providing a constant value resistor in the pressure sensor 4, that is, the distance d1 from the fourth resistor R4 to the sealant structure 101 closest to the pressure sensor 4 is smaller than the piezoresistors in the pressure sensor 4, namely, the distance d2 from the third resistor R3 to the sealant structure 101 closest to the pressure sensor 4, the piezoresistors, namely, the second resistor R2 and the third resistor R3 are located in the display area AA of the display panel to reduce the pressure detection value of the sealant structure 1 on the pressure sensor 4, so that the pressure sensor 4 occupies the width of the peripheral circuit area NAA, and the influence of the piezoresistor located in the display area AA on the light transmittance of the display panel is avoided.
Fig. 9 is a schematic cross-sectional view taken along direction EE' in fig. 1. With reference to fig. 1 and fig. 9, the display panel may further include a plurality of touch signal lines 61, a plurality of touch electrodes 6, a plurality of driving transistors T, a plurality of pixel electrodes 71, and a plurality of light shielding structures 8, where each touch electrode 6 is electrically connected to at least one touch signal line 61, each driving transistor T is electrically connected to one pixel electrode 71, each light shielding structure 8 is disposed corresponding to a channel 21 of one driving transistor T, and the light shielding structures 8 can effectively prevent light from irradiating the channel 21 of the thin film transistor T to generate photo-generated carriers to affect the switching characteristics of the thin film transistor T. Taking a liquid crystal display panel as an example, fig. 9 exemplarily multiplexes the common electrode 72 as the touch electrode 6, and the touch electrode 6 is a self-capacitance touch electrode, the display panel performs display and touch position detection in a time-sharing manner, when performing display, the driving module transmits a common electrode signal to the common electrode 72, the liquid crystal molecules 31 are deflected under the action of the common electrode signal on the common electrode 72 and the pixel electrode signal on the pixel electrode 71, and the display panel realizes a display function. When the touch position is detected, the driving module does not transmit a common electrode signal to the common electrode 72 any more, at this time, the common electrode 72 is reused as the touch electrode 6, the driving module transmits a touch signal to the corresponding touch electrode 6, the touch electrode 6 forms a capacitor with the ground, and the touch position can be detected by detecting the capacitance fed back from the touch electrode 6.
Exemplarily, referring to fig. 1 and 9, when the materials of the constant resistors, i.e., the first resistor R1 and the fourth resistor R4, are metal materials, and the materials of the piezoresistor, i.e., the second resistor R2 and the third resistor R3, are semiconductor materials, since the touch electrode 6, the gate 22 of the driving transistor T, the source 24 of the driving transistor T, the drain 25 of the driving transistor T, the pixel electrode 71 and the light shielding structure 8 are all metal structures, and the active layer 23 of the thin film transistor T is a semiconductor structure, the constant resistors, i.e., the first resistor R1 and the fourth resistor R4, are made of the same material and in the same layer as the touch electrode 6, the gate 22 of the driving transistor T, the source 24 or drain 25 of the driving transistor T, the pixel electrode 71 or the light shielding structure 8, and fig. 9 exemplarily sets the constant resistors, i.e., the first resistor R1 and the fourth resistor R4, are made of the same material and in the same layer as the touch electrode 6, the piezoresistors, i.e., the second resistor R2 and the third resistor R3, are made of the same material and in the same layer as the active layer 23 of the driving transistor T, and since the fixed resistors, i.e., the first resistor R1 and the fourth resistor R4, and the piezoresistors, i.e., the second resistor R2 and the third resistor R3, are located in different layers, the first resistor to the fourth resistor in the pressure sensor 4 can be electrically connected to the corresponding ends through the through holes.
Exemplarily, fig. 10 is a schematic cross-sectional structure diagram of another display panel provided in the embodiment of the present invention. With reference to fig. 1 and 10, when the materials forming the constant resistors, i.e., the first resistor R1 and the fourth resistor R4, and the materials forming the piezoresistors, i.e., the second resistor R2 and the third resistor R3, are all metal materials, the constant resistors, i.e., the first resistor R1 and the fourth resistor R4, and the piezoresistors, i.e., the second resistor R2 and the third resistor R3, may be made of the same material as the touch electrode 6, the gate 22 of the driving transistor T, the source 24 or the drain 25 of the driving transistor T, the pixel electrode 71 or the light shielding structure 8, and fig. 10 exemplarily sets the constant resistors, i.e., the first resistor R1 and the fourth resistor R4, and the piezoresistors, i.e., the second resistor R2 and the third resistor R3, to be made of the same material as the pixel electrode 71.
It should be noted that fig. 9 and fig. 10 only exemplarily set the display panel as a liquid crystal display panel, and the display panel may also be an organic light emitting display panel, as shown in fig. 11, the organic light emitting display panel may include a plurality of organic light emitting structures 9 and thin film transistors T electrically connected to the organic light emitting structures 9 in a one-to-one correspondence manner, then the pixel electrode 71 in the above embodiment may be equivalent to an anode 91 in the organic light emitting structure 9, the common electrode 72 in the above embodiment may be equivalent to a cathode 92 in the organic light emitting structure 9, and the arrangement manner of the constant value resistor and the film layer where the piezoresistor is located in the pressure sensor is similar to that of the liquid crystal display panel, which is not repeated herein.
It should be noted that fig. 1 only exemplarily shows that the touch electrodes are configured as self-capacitance touch electrodes, or alternatively, the touch electrodes may be configured as mutual capacitance touch electrodes, as shown in fig. 12, the touch electrodes may include mutual capacitance touch driving electrodes 104 and mutual capacitance touch sensing electrodes 103, when the display panel performs touch position detection, a driving module (not shown in fig. 12) may sequentially input touch driving signals to the mutual capacitance touch driving electrodes 104 through mutual capacitance touch driving electrode signal lines 106, the mutual capacitance touch sensing electrodes 103 output touch sensing signals through mutual capacitance touch sensing electrode signal lines 105, so that the capacitance values of the intersections of all the mutual capacitance touch driving electrodes 104 and the mutual capacitance touch sensing electrodes 103, that is, the capacitance values of the whole two-dimensional plane, and the coordinates of the touch points may be calculated according to the capacitance variation data of the two-dimensional plane, the touch position detection function of the display panel is realized. Since the mutual capacitance type touch driving electrodes 104 and the mutual capacitance type touch sensing electrodes 103 are made of metal materials, the resistance made of metal materials in the pressure sensor can be made of the same material as the mutual capacitance type touch driving electrodes 104 or the mutual capacitance type touch sensing electrodes 103.
Optionally, with reference to fig. 1 and fig. 2, a distance d2 between the piezoresistors in the pressure sensor 4, that is, the second resistor R2 and the third resistor R3, and the adjacent edge of the sealant structure 101 closest to the pressure sensor 4 is greater than 0 μm and less than or equal to 500 μm. The distance d2 between the pressure-sensitive resistors in the pressure sensor 4, that is, the second resistor R2 and the third resistor R3, and the adjacent edge of the sealant structure 101 closest to the pressure sensor 4 is set to be greater than 0 μm, that is, the corresponding sealant structure 1 is set to cover the fixed-value resistors in the pressure sensor 4, that is, the first resistor R1 and the fourth resistor R4 at most, but not to cover the pressure-sensitive resistors in the pressure sensor 4, that is, the second resistor R2 and the third resistor R3, so that the sealant structure 1 is ensured not to influence the pressure detection value of the pressure sensor 4, and the accuracy of the pressure detection performed by the pressure sensor 4 is improved. In addition, the width of the peripheral circuit area NAA of the display panel is generally not more than 500 μm, and the piezoresistors in the pressure sensor 4 are arranged, that is, the distance d2 between the second resistor R2 and the third resistor R3 and the adjacent edge of the sealant structure 101 closest to the pressure sensor 4 is not more than 500 μm, so that the piezoresistors, that is, the second resistor R2 and the third resistor R3, can be kept away from the display area AA of the display panel as far as possible while the sealant structure 1 is ensured not to cover the piezoresistors in the pressure sensor 4, that is, the second resistor R2 and the third resistor R3, and the influence on the light shielding rate of the display panel is avoided.
It should be noted that the drawings of the embodiments of the present invention only show the sizes of the elements by way of example, and do not represent the actual sizes of the elements in the display panel.
In the embodiment of the invention, any two adjacent resistors in the first resistor to the fourth resistor in the pressure sensor are set as constant-value resistors, the other two resistors are piezoresistors, at least part of the fixed value resistors are positioned in the peripheral circuit area, and the distance from the fixed value resistors in the pressure sensor to the frame rubber structure closest to the pressure sensor is smaller than the distance from the piezoresistors in the pressure sensor to the frame rubber structure closest to the pressure sensor, namely, the constant value resistor in the pressure sensor is arranged close to the corresponding frame glue structure, and the pressure sensitive resistor is arranged far away from the corresponding frame glue structure, thereby greatly reducing the probability that the frame glue structure covers the pressure sensitive resistor in the pressure sensor, the pressure detection value of the pressure sensor depends on the deformation of the piezoresistor, and the fixed value resistor does not influence the pressure detection value of the pressure sensor, so that the probability that the frame adhesive structure covers the piezoresistor in the pressure sensor is reduced. And then the influence of the frame glue structure on the pressure detection process of the pressure sensor is reduced. In addition, at least partial overlap of the vertical projection of the frame glue structure on the first substrate and the vertical projection of the fixed-value resistor on the first substrate is set, and the vertical projection of the frame glue structure on the first substrate and the vertical projection of the fixed-value resistor on the array substrate are not overlapped, so that the width of a peripheral circuit area of the display panel is reduced, and the realization of a narrow frame of the display panel is facilitated.
Fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 13, the display device 28 includes the display panel 27 in the above embodiment, so that the display device 28 provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, and further description is omitted here. The display device 28 may be an electronic display device such as a mobile phone, a computer, or a television.
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 illustrated herein, but is capable of various obvious changes, rearrangements 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 including a display region and a peripheral circuit region surrounding the display region, comprising:
the frame glue structure is positioned in the peripheral circuit area and arranged around the display area;
the frame glue structure is positioned between the first substrate and the second substrate;
a plurality of pressure sensors, each of the pressure sensors including a first resistor, a second resistor, a third resistor, and a fourth resistor, and a first power signal input, a second power signal input, a first sensing signal output, and a second sensing signal output; a first end of the first resistor and a first end of the fourth resistor are electrically connected with the first power supply signal input end, a second end of the first resistor and a first end of the second resistor are electrically connected with the first sensing signal output end, a second end of the fourth resistor and a first end of the third resistor are electrically connected with the second sensing signal output end, and a second end of the second resistor and a second end of the third resistor are electrically connected with the second power supply signal input end;
wherein the first resistance, the second resistance, the third resistance, and the fourth resistance in the pressure sensor satisfy any one of the following conditions:
the first resistor and the second resistor are constant value resistors, and the third resistor and the fourth resistor are piezoresistors;
or the second resistor and the third resistor are constant resistors, and the first resistor and the fourth resistor are piezoresistors;
or the third resistor and the fourth resistor are constant value resistors, and the first resistor and the second resistor are piezoresistors;
or the first resistor and the fourth resistor are constant value resistors, and the second resistor and the third resistor are piezoresistors;
at least part of the fixed value resistor is positioned in the peripheral circuit area, and the distance from the fixed value resistor in the pressure sensor to the frame adhesive structure closest to the pressure sensor is smaller than the distance from the pressure sensitive resistor in the pressure sensor to the frame adhesive structure closest to the pressure sensor;
the vertical projection of the frame glue structure on the first substrate is at least partially overlapped with the vertical projection of the constant value resistor on the first substrate;
the piezoresistor is positioned in the display area or the peripheral circuit area; the display panel further comprises a black matrix; when the piezoresistor is positioned in the display area, the vertical projection of the black matrix on the first substrate covers the vertical projection of the piezoresistor on the first substrate.
2. The display panel according to claim 1, wherein a material constituting the fixed resistors is a metal material, and a material constituting the piezoresistors is a semiconductor material.
3. The display panel according to claim 2, wherein the constant value resistor and the piezoresistor are both block-shaped in outline; or the contour of the constant value resistor is in a block shape, and the contour of the piezoresistor is in a snake shape.
4. The display panel according to any one of claims 2 or 3, characterized by further comprising:
the touch control device comprises a plurality of touch control signal lines and a plurality of touch control electrodes, wherein each touch control electrode is electrically connected with at least one touch control signal line;
the pixel structure comprises a plurality of driving transistors and a plurality of pixel electrodes, wherein each driving transistor is correspondingly and electrically connected with one pixel electrode;
a plurality of light shielding structures, each light shielding structure corresponding to a channel of one of the driving transistors;
the constant value resistor and the touch electrode, the grid electrode of the driving transistor, the source drain electrode of the driving transistor, the pixel electrode or the shading structure are made of the same material in the same layer, and the piezoresistor and the active layer of the driving transistor are made of the same material in the same layer.
5. The display panel according to claim 1, wherein the constant value resistor and the piezoresistor are both made of a metal material; the contour of the constant value resistor is in a block shape, and the contour of the piezoresistor is in a snake shape.
6. The display panel according to claim 5, further comprising:
the touch control device comprises a plurality of touch control signal lines and a plurality of touch control electrodes, wherein each touch control electrode is electrically connected with at least one touch control signal line;
the pixel structure comprises a plurality of driving transistors and a plurality of pixel electrodes, wherein each driving transistor is correspondingly and electrically connected with one pixel electrode;
a plurality of light shielding structures, each light shielding structure corresponding to a channel of one of the driving transistors;
the constant value resistor, the piezoresistor, the touch electrode, the grid electrode of the driving transistor, the source and drain electrodes of the driving transistor, the pixel electrode or the shading structure are made of the same material in the same layer.
7. The display panel according to claim 1, wherein a distance between the piezoresistor in the pressure sensor and an adjacent edge of the sealant structure closest to the pressure sensor is greater than 0 μm and less than or equal to 500 μm.
8. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
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| CN113163045B (en) * | 2020-01-22 | 2023-08-04 | 华为技术有限公司 | Pressure detection structure and electronic equipment |
| CN111403444B (en) * | 2020-03-23 | 2023-05-19 | 京东方科技集团股份有限公司 | Display panel, manufacturing method and display device |
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| CN107102466A (en) * | 2017-06-30 | 2017-08-29 | 上海天马微电子有限公司 | A kind of display panel and touch control display apparatus |
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| CN107256101A (en) * | 2017-06-30 | 2017-10-17 | 上海天马微电子有限公司 | A kind of touch-control display panel and display device |
| CN107275348A (en) * | 2017-07-13 | 2017-10-20 | 厦门天马微电子有限公司 | A kind of display panel and display device |
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| CN107102466A (en) * | 2017-06-30 | 2017-08-29 | 上海天马微电子有限公司 | A kind of display panel and touch control display apparatus |
| CN107256101A (en) * | 2017-06-30 | 2017-10-17 | 上海天马微电子有限公司 | A kind of touch-control display panel and display device |
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