CN110007799B - Display panel and touch method thereof - Google Patents
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- CN110007799B CN110007799B CN201910283437.3A CN201910283437A CN110007799B CN 110007799 B CN110007799 B CN 110007799B CN 201910283437 A CN201910283437 A CN 201910283437A CN 110007799 B CN110007799 B CN 110007799B
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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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/126—Shielding, e.g. light-blocking means over the TFTs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
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Abstract
The invention discloses a display panel and a touch control method of the display panel, which are used for solving the problems of higher manufacturing cost and thicker display module of a display device with fingerprint identification in the prior art. The display panel includes: an OLED display substrate and a cover plate; a cathode layer is arranged on one side of the OLED display substrate facing the cover plate; the cathode layer comprises a plurality of block-shaped touch electrodes arranged in an array manner and a first connecting part; the block-shaped touch electrodes arranged along the first direction are communicated with each other through the first connecting part to form a first touch detection electrode; the cover plate is provided with a plurality of bulges at one side facing the OLED display substrate, and a second connecting part is arranged at one side of the bulges facing the OLED display substrate; the block-shaped touch electrodes arranged along the second direction are mutually conducted through the second connecting part to form a second touch detection electrode.
Description
Technical Field
The present invention relates to the field of semiconductor technologies, and in particular, to a display panel and a touch method for the display panel.
Background
Fingerprint recognition for a display has been in recent years, and from the beginning of a home key of a apple mobile phone has a fingerprint recognition function, to the present day, a device has an off-screen fingerprint recognition technology, but the off-screen fingerprint recognition technology has a lot of defects. The fingerprint identification module is commonly hung on the market at present, namely, the fingerprint identification module is attached to the display, but the cost is increased, and the thickness of the display module is also increased.
Disclosure of Invention
The invention provides a display panel and a touch control method of the display panel, which are used for solving the problems of higher manufacturing cost and thicker display module of a display device with fingerprint identification in the prior art.
An embodiment of the present invention provides a display panel including: an OLED display substrate and a cover plate;
a cathode layer is arranged on one side of the OLED display substrate facing the cover plate; the cathode layer comprises a plurality of block-shaped touch electrodes arranged in an array manner and a first connecting part; the block-shaped touch electrodes arranged along the first direction are communicated with each other through the first connecting part to form a first touch detection electrode;
the cover plate is provided with a plurality of bulges at one side facing the OLED display substrate, and a second connecting part is arranged at one side of the bulges facing the OLED display substrate; the block-shaped touch electrodes arranged along the second direction are mutually conducted through the second connecting part to form a second touch detection electrode.
In one possible embodiment, the cathode layer includes a first region and a second region; the area of each block touch electrode in the first area is smaller than that of each block touch electrode in the second area, and the density of the block touch electrodes in the first area is greater than that of the block touch electrodes in the second area.
In one possible embodiment, the first region and the second region are aligned along the second direction; the second touch detection electrode in the first area and the second touch detection electrode in the second area are disconnected with each other;
or, the first region and the second region are arranged along the first direction; the first touch detection electrode in the first area and the first touch detection electrode in the second area are disconnected from each other.
In one possible implementation manner, the second touch detection electrode in the first area is used as a touch driving electrode; a touch control chip is arranged in a non-display area of the OLED display substrate, and a scanning driving circuit is arranged in the non-display area of the cover plate;
the scanning driving circuit is electrically connected with the second touch detection electrode in the first area;
the touch chip is electrically connected with the first touch detection electrode in the first area, and the first touch detection electrode and the second touch detection electrode in the second area.
In one possible embodiment, a side of the cathode layer facing away from the cover plate has a pixel defining layer;
an isolation structure is further arranged between the pixel defining layer and the cathode layer, and the orthographic projection of the pixel defining layer on the OLED display substrate covers the orthographic projection of the isolation structure on the OLED display substrate; the cathode layer is disconnected at two sides of the isolation structure to form a plurality of block-shaped touch electrode blocks.
In one possible embodiment, the isolation structure has an inverted trapezoid cross-sectional pattern perpendicular to the extending direction.
In one possible embodiment, the height of the protrusions is greater than the height of the isolation structures in a direction perpendicular to the OLED display substrate.
In one possible embodiment, a light emitting layer is further provided between the isolation structure and the cathode layer.
The embodiment of the invention also provides a touch control method of the display panel, which comprises the following steps:
loading touch driving signals to each first touch detection electrode;
and performing touch detection according to the touch sensing signals fed back by the second touch detection electrodes.
In one possible implementation manner, the performing touch detection according to the touch sensing signal fed back by each of the second touch detection electrodes includes:
when the touch area and/or the touch duration are determined to meet the preset conditions, starting a fingerprint identification processing mode;
grounding the first touch detection electrode and the second touch detection electrode of the second area;
and determining the finger texture according to the touch sensing signal fed back by the second touch detection electrode of the first area.
The embodiment of the invention has the following beneficial effects: the display panel provided by the embodiment of the invention comprises: an OLED display substrate and a cover plate; a cathode layer is arranged on one side of the OLED display substrate facing the cover plate; the cathode layer comprises a plurality of block-shaped touch electrodes arranged in an array manner and a first connecting part; the block-shaped touch electrodes arranged along the first direction are communicated with each other through the first connecting part to form a first touch detection electrode; the cover plate is provided with a plurality of bulges at one side facing the OLED display substrate, and a second connecting part is arranged at one side of the bulges facing the OLED display substrate; the block touch electrodes arranged along the second direction are mutually conducted through the second connection part to form a second touch detection electrode, namely, compared with the display panel in the prior art, which needs to be independently provided with the externally hung fingerprint identification module or touch module, the display panel in the embodiment of the invention has the touch layer integrated inside the display panel, thereby avoiding the problems of higher manufacturing cost and thicker display module of the display device with fingerprint identification in the prior art.
Drawings
Fig. 1 is a schematic top view of an OLED display substrate according to an embodiment of the present disclosure;
fig. 2 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of the display panel of FIG. 2 at DD';
FIG. 4 is a schematic cross-sectional view of the OLED display substrate of FIG. 1 at CC';
fig. 5 is a schematic structural diagram of the first region S1 and the second region S2 arranged along the second direction BB';
fig. 6 is a schematic structural diagram of the first region S1 and the second region S2 arranged along the first direction AA';
fig. 7 is a schematic top view of a display panel including a scan driving circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a sub-scan driving circuit according to an embodiment of the present invention;
FIG. 9 is a timing diagram corresponding to a sub-scan driving circuit according to an embodiment of the present invention;
fig. 10 is a schematic flow chart of a driving method according to an embodiment of the present invention;
fig. 11 is a flow chart of a specific driving method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed description of known functions and known components.
An embodiment of the present invention provides a display panel, with reference to fig. 1 to 3, fig. 1 is a schematic top view of an OLED display substrate, fig. 2 is a schematic top view of the display panel, fig. 3 is a schematic cross-sectional view of fig. 2 at DD', and the display panel includes: an OLED display substrate 1 and a cover plate 2; wherein,,
as shown in fig. 1, the side of the OLED display substrate 1 facing the cover plate 2 has a cathode layer; the cathode layer comprises a plurality of block-shaped touch electrodes 11 arranged in an array manner and a first connecting part 12; the block-shaped touch electrodes 11 arranged along the first direction AA' are mutually communicated through the first connecting part 12 to form a first touch detection electrode;
as shown in fig. 2 and 3, the cover plate 2 has a plurality of protrusions 21 on a side facing the OLED display substrate 1, and a second connection portion 22 on a side of the protrusions 21 facing the OLED display substrate 1; the block-shaped touch electrodes 11 arranged along the second direction BB' are connected to each other by the second connection portion 22 to constitute a second touch detection electrode.
The display panel provided by the embodiment of the invention comprises: an OLED display substrate 1 and a cover plate 2; the side of the OLED display substrate 1 facing the cover plate 2 is provided with a cathode layer; the cathode layer comprises a plurality of block-shaped touch electrodes 11 arranged in an array manner and a first connecting part 12; the block-shaped touch electrodes 11 arranged along the first direction AA' are mutually communicated through the first connecting part 12 to form a first touch detection electrode; the cover plate 2 has a plurality of protrusions 21 on a side facing the OLED display substrate 1, and a second connection part 22 on a side of the protrusions 21 facing the OLED display substrate 1; the block touch electrodes 11 arranged along the second direction BB ' are mutually conducted through the second connection portion 22 to form a second touch detection electrode, that is, in the display panel of the embodiment of the present invention, the cathode layer is multiplexed to be used as the touch electrode layer, the cathode layer includes a plurality of block touch electrodes 11 and the first connection portion 12, the block touch electrodes 11 in the first direction AA ' are conducted through the first connection portion 12 to form the first touch detection electrode, and the cover plate 2 has the second connection portion 22, so that after the OLED display substrate 1 and the cover plate 2 are paired, the block touch electrodes 11 in the second direction BB ' can be conducted through the second connection portion 22 of the cover plate 2 to form the second touch detection electrode.
In a specific implementation, the shape of each block of touch electrode blocks 11 may be diamond, and the edges and corners of each block of touch electrode blocks 11 in the first direction AA 'are set in opposite order, so as to form a plurality of first touch detection electrodes extending along the first direction AA', and each touch electrode block 11 in the second direction BB 'is set in opposite order, so as to form a plurality of second touch detection electrodes extending along the second direction BB'. The first direction AA 'may be specifically a row direction, and the second direction BB' may be specifically a column direction. For the protrusions 21 of the cover plate 2, the protrusions 21 may be arranged in one-to-one correspondence with the block-shaped touch electrodes 11 of the second touch detection electrode, that is, one block-shaped touch electrode 11 of the second touch detection electrode is correspondingly provided with one protrusion 21, and the orthographic projection of the corresponding protrusion 21 of the block-shaped touch electrode 11 on the cover plate 2 is covered by the orthographic projection of the cover plate 2, that is, the orthographic projection of the protrusion 21 on the cover plate 2 is smaller than the orthographic projection of the corresponding block-shaped touch electrode 11 on the cover plate 2, so that the problem that touch detection cannot be performed due to the fact that the size of the protrusion 21 is too large and the block-shaped touch electrodes 11 of the first touch detection electrode are possibly conducted with the block-shaped touch electrodes 11 of the second touch detection electrode when the plurality of block-shaped touch electrodes 11 are covered is solved. For the second touch detection electrode, as shown in fig. 3, the second connection portion 22 forms corresponding protrusions at the positions of the two protrusions 21 at two sides of the gap region, forms corresponding recesses at the gap region, and the second connection portion 22 forms an integral connection structure with the gap region at the two protrusions 21, so as to conduct the two block-shaped touch electrodes 11 at two sides of the gap region in a bridging manner.
In practice, reference is made to fig. 4, wherein fig. 4 is a schematic cross-sectional view of fig. 1 at CC', the side of the cathode layer facing away from the cover plate having a pixel defining layer (not shown in fig. 4); an isolation structure 13 is arranged between the pixel defining layer and the cathode layer, and the orthographic projection of the pixel defining layer on the OLED display substrate 1 covers the orthographic projection of the isolation structure 13 on the OLED display substrate; the cathode layer is disconnected at both sides of the isolation structure 13 to form a plurality of block-shaped touch electrode blocks.
In the embodiment of the invention, the isolation structure 13 is disposed between the pixel defining layer and the cathode layer, and the orthographic projection of the pixel defining layer on the OLED display substrate covers the orthographic projection of the isolation structure 13 on the OLED display substrate, so that the cathode layer can be patterned and segmented, i.e., the pixel defining layer generally has a retaining wall structure for spacing the pixel units, and the isolation structure 13 is disposed above the pixel defining layer and at a position corresponding to the retaining wall structure, i.e., the isolation structure 13 is disposed at a gap between adjacent pixel units, so as to avoid the influence on the display of the display panel. In the embodiment of the invention, since the cathode of the OLED display panel is an evaporation material, the OLED functional layer (may include a light-emitting layer) is isolated from water and oxygen after passing, and then a Mask process step cannot be performed, and further, before the OLED functional layer and the cathode layer are manufactured, a negative adhesive is adopted to form the isolation structure 13, and in the subsequent process of manufacturing the cathode layer, the cathode layer is generally made of a metal material, and the characteristic of better straightness in the evaporation process is utilized, so that the cathode patterning (Pattern) can be further realized, and the cathode patterning is divided into the block-shaped touch electrode 11 and the first connection portion 12.
In the embodiment, referring to fig. 4, the isolation structure 13 has an inverted trapezoid shape in a cross-sectional view perpendicular to the extending direction. In the embodiment of the invention, the cross section of the isolation structure 13 perpendicular to the extending direction is in an inverted trapezoid shape, that is, the area of one surface of the isolation structure 13 facing the cathode layer is larger than the area of one surface facing away from the cathode layer, which is beneficial to breaking and dividing the cathode layer and realizing patterning.
In particular, as shown in connection with fig. 3, the height of the protrusions 21 is greater than the height of the isolation structures 13 in a direction perpendicular to the OLED display substrate. That is, in the embodiment of the present invention, the height of the protrusion 21 of the cover plate 2 is greater than the height of the isolation structure 13 of the OLED display substrate 1, and since the film layers of the common cathode layer and the second connection portion are thinner, the second connection portion 22 can be prevented from contacting the cathode layer at the position of the isolation structure 13 (i.e. the cathode layer at the reference numeral 15 in fig. 3), so that the second connection portion 22 only connects two bulk touch electrodes 11 of the same second touch detection electrode. The shape of the protrusion 21 may be specifically trapezoidal, that is, the area of the surface of the protrusion 21 facing the second connection portion 22 is smaller than the area of the surface facing away from the second connection portion 22, which is favorable for the second connection portion 22 to climb a slope and realize bridging connection. The material of the second connection portion 22 may be a conductive metal.
In a specific implementation, a light-emitting layer is further provided between the isolation structure 13 and the cathode layer. In the embodiment of the present invention, a light-emitting layer is further disposed between the isolation structure 13 and the cathode layer, that is, since the light-emitting layer and the cathode layer are generally formed by an evaporation process and are easily corroded by water and oxygen, the processes such as masking, developing, etching, etc. cannot be performed after the light-emitting layer and the cathode layer are manufactured, and further the isolation structure 13 is manufactured before the light-emitting layer and the cathode layer are manufactured, so that the influence on the light-emitting layer and the cathode layer can be avoided.
In specific implementation, as shown in fig. 1 and fig. 2, the cathode layer may specifically include a first area S1 and a second area S2, where the first area S1 may be used as a fingerprint identification area, and the second area S2 may be used as another area other than the fingerprint identification area; the area of each block touch electrode 11 in the first area S1 is smaller than the area of each block touch electrode 11 in the second area S2, and the density of the block touch electrodes 11 in the first area S1 is greater than the density of the block touch electrodes in the second area. It should be understood that the area of each of the bulk touch electrodes 11 in the first area S1 is smaller than the area of each of the bulk touch electrodes 11 in the second area S2, which means that the area of the bulk touch electrodes 11 in the first area S1 is smaller than the area of the bulk touch electrodes 11 in the second area S2, and the area of the bulk touch electrodes 11 can be flexibly set as required for the adjacent areas of the first area S1 and the second area S2.
In the embodiment of the invention, the cathode layer further comprises a first area S1 and a second area S2, wherein the density of the block-shaped touch electrodes 11 of the first area S1 is greater than that of the block-shaped touch electrodes 11 of the second area S2, namely, the first area S1 can be used as a fingerprint identification area, so that the requirement on the precision of the touch detection electrodes during fingerprint identification can be met.
In specific implementation, referring to fig. 5, the first and second regions S1 and S2 are arranged along the second direction BB'; the second touch detection electrode (the touch detection electrode formed by the dark-colored mutually connected block-shaped touch electrodes 11) in the first area S1 and the second touch detection electrode (the touch detection electrode formed by the dark-colored mutually connected block-shaped touch electrodes 11) in the second area S2 are disconnected from each other; alternatively, referring to fig. 6, the first and second regions S1 and S2 are arranged along the first direction AA'; the first touch detection electrodes (the touch detection electrodes formed by the dark-colored interconnected block-shaped touch electrodes 11) in the first area A1 are disconnected from the first touch detection electrodes (the touch detection electrodes formed by the dark-colored interconnected block-shaped touch electrodes 11) in the second area S2.
In the embodiment of the present invention, the first area S1 and the second area S2 may be arranged along the second direction BB ', may be arranged along the first direction AA', or may be arranged in other manners. When the first area S1 and the second area S2 are arranged along the second direction BB ', the second touch detection electrodes in the first area S1 and the second touch detection electrodes in the second area S2 are disconnected from each other, that is, the second touch detection electrodes extending along the second direction BB' are disconnected, so that the second touch detection electrodes in the first area S1 can be independently controlled during fingerprint identification, the second touch detection electrodes in the second area S2 are conveniently grounded, the noise influence on fingerprint identification is reduced, and the fingerprint identification accuracy is improved. Similarly, when the first area S1 and the second area S2 are arranged along the first direction AA ', the first touch detection electrodes in the first area S1 are disconnected from the first touch detection electrodes in the second area S2, that is, the first touch detection electrodes extending along the first direction AA' are disconnected, so that the first touch detection electrodes in the first area S1 can be independently controlled during fingerprint identification, the first touch detection electrodes in the second area S2 are conveniently grounded, noise influence during fingerprint identification is reduced, and fingerprint identification accuracy is improved.
In specific implementation, referring to fig. 7, the second touch detection electrode in the first area S1 may be used as a touch driving electrode; the OLED display substrate 1 is provided with a touch control chip 17 in a non-display area, and the cover plate 2 is provided with a scanning driving circuit 24 in the non-display area; the scan driving circuit 24 is electrically connected with the second touch detection electrode in the first area S1; the touch chip 17 is electrically connected to the first touch detection electrode in the first area S1, and the first touch detection electrode and the second touch detection electrode in the second area S2. The first touch detection electrode and the second touch electrode may be electrically connected to the touch chip 17 or the scan driving circuit 24 through the lead 14.
In the embodiment of the invention, the second touch detection electrode in the first area S1 can be used as a touch driving electrode, and the touch detection electrode in the first area S1 can be electrically connected with the scan driving circuit 24 of the cover plate 2, that is, due to the fact that the required detection precision is higher during fingerprint identification, more second touch detection electrodes and first touch detection electrodes are required, and due to the fact that the number of channels (pins) of the touch chip is limited, the function of scanning the second touch detection electrode progressively can be started by receiving an STV signal in the scan driving circuit 24 through the arrangement of the scan driving circuit 24, and further the design of the workload of the touch chip (IC) 24 can be reduced, that is, the resolution precision of fingerprint identification on the touch detection electrode can be improved and the workload of the touch chip IC processor can be reduced by adopting a progressive scanning mode of the scan driving circuit 24.
The circuit structure of the scan driving circuit 24 may specifically include a plurality of sub-scan driving circuits, each of which is coupled to a second touch detection electrode in the first area S1, and the structure of each of the sub-scan driving circuits may specifically be as shown in fig. 8, and the corresponding timing diagram may be as shown in fig. 9. The sub-scan driving circuit may specifically include a first switching transistor T1, a second switching transistor T2, a third switching transistor T3, a fourth switching transistor T4, a fifth switching transistor T5, a sixth switching transistor T6, a seventh switching transistor T7, an eighth switching transistor T8, a first capacitor C1, and a second capacitor C2. Wherein the gate of the first switching transistor T1 is configured to be coupled to the first signal terminal CK, the first pole of the first switching transistor T1 is configured to be coupled to the second signal terminal GSTV, and the second pole of the first switching transistor T1 is coupled to the gate of the second switching transistor T2; the first pole of the second switching transistor T2 is configured to be coupled to the first signal terminal CK, and the second pole of the second switching transistor T2 is coupled to the gate of the fourth switching transistor T4 (i.e., the second pole of the second switching transistor T2 is coupled to the fourth node N4); the gate of the third switching transistor T3 is configured to be coupled to the first signal terminal CK, the first pole of the third switching transistor T3 is configured to be coupled to the fourth signal terminal VL, and the second pole of the third switching transistor T3 is coupled to the gate of the fourth switching transistor T4 (i.e., the second pole of the third switching transistor T3 is also coupled to the fourth node N4); the first pole of the fourth switching transistor T4 is configured to be coupled to the fifth signal terminal VH, and the second pole of the fourth switching transistor T4 is coupled to the second touch detection electrode (the second pole of the fourth switching transistor T4 is used as the output terminal Out of the sub-scan driving circuit); the gate of the sixth switching transistor T6 is coupled to the second pole of the third switching transistor T3 (i.e., the gate of the sixth switching transistor T6 is coupled to the fourth node N4), the first pole of the sixth switching transistor T6 is configured to be coupled to the fifth signal terminal VH, and the second pole of the sixth switching transistor T6 is coupled to the first pole of the seventh switching transistor T7 (i.e., the second pole of the sixth switching transistor T6 is coupled to the second node N2); the gate of the seventh switching transistor T7 is configured to be coupled to the third signal terminal CB, and the second pole of the seventh switching transistor T7 is coupled to the first pole of the eighth switching transistor T8 (i.e., the second pole of the seventh switching transistor T7 is coupled to the first node N1); the gate of the eighth switching transistor T8 is configured to be coupled to the fourth signal terminal VL, and the second pole of the eighth switching transistor T8 is coupled to the gate of the fifth switching transistor T5 (i.e., the second pole of the eighth switching transistor T8 is coupled to the third node N3); the first pole of the fifth switching transistor T5 is configured to be coupled to the third signal terminal CB, and the second pole of the fifth switching transistor T5 is coupled to the second touch detection electrode (i.e., the second pole of the fifth switching transistor T5 is used as the output terminal Out of the sub-scan driving circuit); one end of the first capacitor C1 is coupled to the gate of the fourth switching transistor T4 (i.e., one end of the first capacitor C1 is coupled to the fourth node N4), and the other end is coupled to the fifth signal terminal VH; one end of the second capacitor C2 is coupled to the gate of the fifth switching transistor T5 (i.e., one end of the second capacitor C2 is coupled to the third node N3), and the other end is coupled to the second pole of the fifth switching transistor T5. The fourth signal terminal VL may be a low-potential dc signal terminal, and the fifth signal terminal VH may be a high-potential dc signal terminal. Out1, out2, out3 in fig. 9 are output signals of the three sub-scanning driving circuits, respectively, that is, the scanning driving circuit sequentially scans each second touch detection electrode line by line.
The embodiment of the invention also provides a touch control method of the display panel, as shown in fig. 10, including:
in step S101, a touch driving signal is loaded to each first touch detection electrode.
Step S102, touch detection is performed according to the touch sensing signals fed back by the second touch detection electrodes.
In the implementation, referring to fig. 11, for step S102, touch detection is performed according to the touch sensing signals fed back by the second touch detection electrodes, which may specifically include:
step S1021, when the touch area and/or the touch duration meet the preset conditions, starting a fingerprint identification processing mode.
In step S1022, the first touch detection electrode and the second touch detection electrode in the second area are grounded.
Step S1023, determining the finger lines according to the touch sensing signals fed back by the second touch detection electrode of the first area. That is, in order to reduce noise, in the case that the display panel performs the fingerprint recognition function, other Touch detection electrodes (Touch electrodes) are grounded, so that a lot of unnecessary noise can be reduced, and the accuracy of fingerprint recognition can be improved.
The embodiment of the invention has the following beneficial effects: the display panel provided by the embodiment of the invention comprises: an OLED display substrate and a cover plate; one side of the OLED display substrate facing the cover plate is provided with a cathode layer; the cathode layer comprises a plurality of block-shaped touch electrodes arranged in an array manner and a first connecting part; the block-shaped touch electrodes arranged along the first direction are communicated with each other through the first connecting part to form a first touch detection electrode; the cover plate is provided with a plurality of bulges at one side facing the OLED display substrate, and a second connecting part is arranged at one side of the bulges facing the OLED display substrate; the second touch detection electrode is formed by conducting the block touch electrodes arranged along the second direction through the second connecting part, namely, the cathode layer is multiplexed to be used as the touch electrode layer of the display panel in the embodiment of the invention, the cathode layer comprises a plurality of block touch electrodes and a first connecting part, the first touch detection electrode is formed by conducting the block touch electrodes in the first direction through the first connecting part, the cover plate is provided with the second connecting part, and further, after the OLED display substrate and the cover plate are subjected to box matching, the second touch detection electrode is formed by conducting the block touch electrodes in the second direction through the second connecting part of the cover plate.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A display panel, comprising: an OLED display substrate and a cover plate;
a cathode layer is arranged on one side of the OLED display substrate facing the cover plate; the cathode layer comprises a plurality of block-shaped touch electrodes arranged in an array manner and a first connecting part, and each touch electrode block is positioned on the same layer; the block-shaped touch electrodes arranged along the first direction are communicated with each other through the first connecting part to form a first touch detection electrode;
the cathode layer includes a first region and a second region; the area of each block touch electrode in the first area is smaller than the area of each block touch electrode in the second area, the density of the block touch electrodes in the first area is larger than the density of the block touch electrodes in the second area, and the first area is an area for fingerprint identification;
the cover plate is provided with a plurality of bulges at one side facing the OLED display substrate, and a second connecting part is arranged at one side of the bulges facing the OLED display substrate; the block-shaped touch electrodes arranged along the second direction are communicated with each other through the second connecting part to form a second touch detection electrode;
the shape of each block-shaped touch electrode block is diamond, the edges and corners of each block-shaped touch electrode block in the first direction are oppositely and sequentially arranged to form a plurality of first touch detection electrodes extending along the first direction, and each touch electrode block in the second direction is oppositely and sequentially arranged to form a plurality of second touch detection electrodes extending along the second direction.
2. The display panel of claim 1, wherein the first region and the second region are aligned along the second direction; the second touch detection electrode in the first area and the second touch detection electrode in the second area are disconnected with each other;
or, the first region and the second region are arranged along the first direction; the first touch detection electrode in the first area and the first touch detection electrode in the second area are disconnected from each other.
3. The display panel of claim 1, wherein the second touch detection electrode in the first region serves as a touch driving electrode; a touch control chip is arranged in a non-display area of the OLED display substrate, and a scanning driving circuit is arranged in the non-display area of the cover plate;
the scanning driving circuit is electrically connected with the second touch detection electrode in the first area;
the touch chip is electrically connected with the first touch detection electrode in the first area, and the first touch detection electrode and the second touch detection electrode in the second area.
4. The display panel of claim 1, wherein a side of the cathode layer facing away from the cover plate has a pixel defining layer;
an isolation structure is further arranged between the pixel defining layer and the cathode layer, and the orthographic projection of the pixel defining layer on the OLED display substrate covers the orthographic projection of the isolation structure on the OLED display substrate; the cathode layer is disconnected at two sides of the isolation structure to form a plurality of block-shaped touch electrode blocks.
5. The display panel of claim 4, wherein the spacer structure has an inverted trapezoid shape in a cross-sectional view perpendicular to the extending direction.
6. The display panel of claim 4, wherein the height of the protrusions is greater than the height of the isolation structures in a direction perpendicular to the OLED display substrate.
7. The display panel of claim 4, wherein a light emitting layer is further provided between the isolation structure and the cathode layer.
8. A touch method of a display panel according to any one of claims 1 to 7, comprising:
loading touch driving signals to each first touch detection electrode;
and performing touch detection according to the touch sensing signals fed back by the second touch detection electrodes.
9. The touch method of claim 8, wherein the performing touch detection according to the touch sensing signal fed back by each of the second touch detection electrodes comprises:
when the touch area and/or the touch duration are determined to meet the preset conditions, starting a fingerprint identification processing mode;
grounding the first touch detection electrode and the second touch detection electrode of the second area;
and determining the finger texture according to the touch sensing signal fed back by the second touch detection electrode of the first area.
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| CN111142293B (en) * | 2019-12-27 | 2022-03-11 | 维沃移动通信有限公司 | Electronic device, control method thereof, and computer-readable storage medium |
| CN111475046B (en) * | 2020-04-03 | 2023-11-21 | 京东方科技集团股份有限公司 | Touch substrate, display panel and touch display device |
| CN111651084B (en) * | 2020-05-29 | 2024-02-06 | 维沃移动通信有限公司 | Touch display screen, electronic equipment and touch and fingerprint acquisition method |
| CN114120813A (en) * | 2020-08-26 | 2022-03-01 | 深圳市柔宇科技股份有限公司 | Display panel and electronic device |
| CN112257524B (en) | 2020-10-09 | 2023-11-03 | 武汉华星光电半导体显示技术有限公司 | Fingerprint identification display panel and fingerprint identification display device |
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| CN105243993B (en) * | 2015-09-22 | 2018-01-26 | 京东方科技集团股份有限公司 | Oled display substrate and its driving method and OLED display |
| CN106201142B (en) * | 2016-07-15 | 2018-11-06 | 京东方科技集团股份有限公司 | A kind of In-cell touch panel, its driving method and display device |
| CN106803076A (en) * | 2017-01-16 | 2017-06-06 | 惠州Tcl移动通信有限公司 | A kind of method and system of fingerprint identification function embedded in display screen |
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