CN106249973A - A kind of In-cell touch panel, its driving method and display device - Google Patents
A kind of In-cell touch panel, its driving method and display device Download PDFInfo
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- CN106249973A CN106249973A CN201610578703.1A CN201610578703A CN106249973A CN 106249973 A CN106249973 A CN 106249973A CN 201610578703 A CN201610578703 A CN 201610578703A CN 106249973 A CN106249973 A CN 106249973A
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- 239000000758 substrate Substances 0.000 claims description 72
- 230000002093 peripheral effect Effects 0.000 claims description 15
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- 239000000463 material Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 abstract 1
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- 238000004519 manufacturing process Methods 0.000 description 7
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- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
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- 239000004642 Polyimide Substances 0.000 description 1
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- 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
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Abstract
The invention discloses a kind of In-cell touch panel, its driving method and display device, when being touched by finger, each first fingerprint detection electrode in touch control detection stage, fingerprint detection region forms self-capacitance and realizes the detection of position of touch；In the fingerprint detection stage, each first fingerprint detection electrode and each second fingerprint detection electrode in fingerprint detection region can form mutual capacitance, owing to the valley and a ridge of finger print is different on the impact of the capacitance of the mutual capacitance of formation, therefore can be by detecting the information that the change of the capacitance between each mutual capacitance detects the valley and a ridge of fingerprint, such that it is able to make In-cell touch panel realize fingerprint detection function.
Description
Technical Field
The invention relates to the technical field of display, in particular to an embedded touch screen, a driving method thereof and a display device.
Background
With the rapid development of technology, mobile products with biometric identification function gradually come into the lives of people. The fingerprint is a characteristic which is unique and unique to the human body and distinguishable from other people, and is composed of a series of valleys and ridges on the surface of the skin at the finger tip, the composition details of which usually include the branches of the ridges, the ends of the ridges, the arches, the tent-like arches, the left-handed, right-handed, spiral, or double-handed details, which determine the unique characteristics of the fingerprint and therefore have received much attention. Currently, people have integrated a pressing type and sliding type fingerprint identification technology based on a silicon-based process into a mobile product, and the key of the future attention is to apply the fingerprint identification technology in a display area of a display panel so that the display panel has a fingerprint identification function.
Therefore, how to implement the fingerprint recognition function in the display area of the display panel is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides an embedded touch screen, a driving method thereof and a display device, which are used for enabling a display area of the touch screen to realize a fingerprint identification function.
Therefore, an embodiment of the present invention provides an in-cell touch screen, including: the embedded touch screen comprises an array substrate, an opposite substrate and a plurality of self-capacitance electrodes, wherein the array substrate and the opposite substrate are arranged oppositely, the self-capacitance electrodes are positioned between the array substrate and the opposite substrate, the embedded touch screen further comprises a fingerprint detection area, and the self-capacitance electrodes positioned in the fingerprint detection area are composed of a plurality of mutually independent first fingerprint detection electrodes;
the fingerprint detection area further comprises a plurality of mutually independent second fingerprint detection electrodes positioned between the array substrate and the opposite substrate, and each second fingerprint detection electrode and each first fingerprint detection electrode are arranged in a crossed mode and are mutually insulated;
in a touch detection stage, each first fingerprint detection electrode forms a self-capacitance for detecting a touch position; in a fingerprint detection stage, each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes form a mutual capacitance for detecting a fingerprint.
Preferably, in the in-cell touch screen provided by the embodiment of the present invention, each of the first fingerprint detection electrodes is located between each of the second fingerprint detection electrodes and the array substrate; or,
each second fingerprint detection electrode is located between each first fingerprint detection electrode and the array substrate.
Preferably, in the in-cell touch screen provided by the embodiment of the present invention, each of the first fingerprint detection electrodes and each of the self-capacitance electrodes are made of the same material in the same layer; and/or the presence of a gas in the gas,
and the second fingerprint detection electrodes are made of the same material in the same layer.
Preferably, the in-cell touch screen provided by the embodiment of the present invention further includes: and the insulating layer is positioned between each first fingerprint detection electrode and each second fingerprint detection electrode.
Preferably, the in-cell touch screen provided by the embodiment of the present invention further includes: a black matrix layer between the array substrate and the opposite substrate;
the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each first fingerprint detection electrode on the array substrate; and/or the presence of a gas in the gas,
and the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each second fingerprint detection electrode on the array substrate.
Preferably, the in-cell touch screen provided by the embodiment of the present invention further includes: the driving chip is electrically connected with each self-capacitance electrode, each first fingerprint detection electrode and each second fingerprint detection electrode;
the driving chip is used for applying a touch driving signal to each first fingerprint detection electrode and each self-capacitance electrode in the touch detection stage, and judging a touch position by detecting the change of capacitance values of each self-capacitance electrode and the change of the sum of the capacitance values of each first fingerprint detection electrode;
in the fingerprint detection stage, loading fingerprint driving signals to the first fingerprint detection electrodes in sequence, and judging the information of the valleys and ridges of the fingerprint by detecting the capacitance value change between the first fingerprint detection electrodes and the second fingerprint detection electrodes; or, sequentially loading a fingerprint driving signal to each second fingerprint detection electrode, and determining information of valleys and ridges of a fingerprint by detecting capacitance changes between each first fingerprint detection electrode and each second fingerprint detection electrode.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, the driving chip is further configured to load an electrical signal, which is the same as the touch driving signal, to each of the second fingerprint detection electrodes in the touch detection stage.
Preferably, in the in-cell touch screen provided by the embodiment of the present invention, the driving chip is located at a side edge of a peripheral area of the in-cell touch screen surrounding the display area;
the fingerprint detection area is located at the side edge of the display area which is closest to the driving chip.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, when a fingerprint driving signal is applied to each of the first fingerprint detection electrodes, each of the first fingerprint detection electrodes extends along a direction parallel to a side of the peripheral area having the driving chip, and each of the second fingerprint detection electrodes extends along a direction perpendicular to the side of the peripheral area having the driving chip; or,
when a fingerprint driving signal is applied to each of the second fingerprint detection electrodes, each of the first fingerprint detection electrodes extends in a direction perpendicular to the side of the peripheral area having the driving chip, and each of the second fingerprint detection electrodes extends in a direction parallel to the side of the peripheral area having the driving chip.
Correspondingly, the embodiment of the invention also provides a display device which comprises any one of the embedded touch screens provided by the embodiment of the invention.
Correspondingly, an embodiment of the present invention further provides a method for driving any one of the in-cell touch screens provided by the embodiments of the present invention, including: a touch detection stage and a fingerprint detection stage; wherein,
in the touch detection stage, loading touch detection signals to each first fingerprint detection electrode and each self-capacitance electrode, and judging a touch position by detecting the change of capacitance values of each self-capacitance electrode and the change of the sum of the capacitance values of each first fingerprint detection electrode;
in the fingerprint detection stage, loading fingerprint driving signals to the first fingerprint detection electrodes in sequence, and judging the information of the valleys and ridges of the fingerprint by detecting the change of capacitance values between the first fingerprint detection electrodes and the second fingerprint detection electrodes; or, sequentially loading a fingerprint driving signal to each second fingerprint detection electrode, and determining information of valleys and ridges of the fingerprint by detecting a change in capacitance value between each first fingerprint detection electrode and each second fingerprint detection electrode.
Preferably, in the driving method provided in the embodiment of the present invention, the method further includes: and in the touch detection stage, loading an electric signal which is the same as the touch driving signal to each second fingerprint detection electrode.
According to the embedded touch screen, the driving method and the display device provided by the embodiment of the invention, when the embedded touch screen is touched by a finger, in a touch detection stage, each first fingerprint detection electrode in a fingerprint detection area forms a self-capacitance to realize detection of a touch position; in the fingerprint detection stage, each first fingerprint detection electrode and each second fingerprint detection electrode in the fingerprint detection area can form mutual capacitance, because the influence of the valley and the ridge of finger fingerprint to the capacitance value of the mutual capacitance that forms is different, consequently can detect the information of the valley and the ridge of fingerprint through the change of the capacitance value that detects between each mutual capacitance to can make embedded touch-sensitive screen realize the fingerprint detection function.
Drawings
FIG. 1 is a schematic top view of an in-cell touch screen according to an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of an in-cell touch screen along the A-A' direction according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a fingerprint detection unit of a driver chip according to an embodiment of the present invention;
fig. 4 is a flowchart of a driving method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of an in-cell touch screen, a driving method thereof and a display device according to embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The thickness, shape, relative size and number of each layer of film in the attached drawings do not reflect the real proportion of the embedded touch screen, and the purpose is only to schematically illustrate the content of the invention.
An in-cell touch screen provided by an embodiment of the present invention, as shown in fig. 1, includes: the embedded touch screen further comprises a fingerprint detection area 400, and the self-capacitance electrodes in the fingerprint detection area 400 are composed of a plurality of mutually independent first fingerprint detection electrodes 410;
the fingerprint detection area 400 further includes a plurality of mutually independent second fingerprint detection electrodes 420 located between the array substrate and the opposite substrate, and each second fingerprint detection electrode 420 is crossed with each first fingerprint detection electrode 410 and insulated from each other;
in the touch detection stage, each first fingerprint detection electrode 410 forms a self-capacitance for detecting a touch position; in the fingerprint detection stage, the first fingerprint detection electrodes 410 and the second fingerprint detection electrodes 420 form mutual capacitance for detecting a fingerprint.
According to the embedded touch screen provided by the embodiment of the invention, when the embedded touch screen is touched by a finger, in a touch detection stage, each first fingerprint detection electrode in the fingerprint detection area forms a self-capacitance to realize detection of a touch position; in the fingerprint detection stage, each first fingerprint detection electrode and each second fingerprint detection electrode in the fingerprint detection area can form mutual capacitance, because the influence of the valley and the ridge of finger fingerprint to the capacitance value of the mutual capacitance that forms is different, consequently can detect the information of the valley and the ridge of fingerprint through the change of the capacitance value that detects between each mutual capacitance to can make embedded touch-sensitive screen realize the fingerprint detection function.
In a specific implementation, in the in-cell touch screen provided in the embodiment of the present invention, since the self-capacitance electrode is composed of a plurality of mutually independent first fingerprint detection electrodes in the touch detection phase, in order to reduce mutual interference between the touch detection phase and the fingerprint detection phase, the in-cell touch screen provided in the embodiment of the present invention needs to be driven in a time-sharing driving manner in the touch detection phase and the fingerprint detection phase.
In a specific implementation, in the in-cell touch screen provided in the embodiment of the present invention, each of the first fingerprint detection electrodes is a driving electrode, and each of the second fingerprint detection electrodes is a detecting electrode; alternatively, each second fingerprint detection electrode is a drive electrode, and each first fingerprint detection electrode is a detection electrode. The driving electrode loads a fingerprint driving signal, and the detection electrode outputs a fingerprint detection signal.
In a specific implementation, in the in-cell touch panel provided by the embodiment of the invention, as shown in fig. 2, each of the second fingerprint detection electrodes 420 is located between each of the first fingerprint detection electrodes 410 and the array substrate 100. Thus, when a finger touches the display screen, in the touch detection stage, the shielding effect of each second fingerprint detection electrode 420 on the first fingerprint detection electrodes 410 forming the self-capacitance can be avoided, so that the signals generated by each first fingerprint detection electrode 410 are larger.
Alternatively, in a specific implementation, in the in-cell touch screen provided in an embodiment of the present invention, each of the first fingerprint detection electrodes is located between each of the second fingerprint detection electrodes and the array substrate. Thus, when a finger touches the display screen, in the touch detection stage, the shielding effect of each second fingerprint detection electrode 420 on the first fingerprint detection electrode 410 forming the self-capacitance may be generated, so that the signal generated by the first fingerprint detection electrode 410 is smaller.
In the embedded touch screen provided by the embodiment of the invention, as shown in fig. 2, the first fingerprint detection electrodes 410 and the capacitance electrodes 300 are made of the same material in the same layer. Thus, the extra process of preparing each first fingerprint detection electrode 410 is not needed, and the graphs of each capacitor electrode 300 and each first fingerprint detection electrode 410 can be formed only by one-time composition process, so that the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved.
In a specific implementation, in the in-cell touch panel provided by the embodiment of the invention, as shown in fig. 2, the second fingerprint detection electrodes 420 are made of the same material in the same layer. Thus, the pattern of each second fingerprint detection electrode 420 can be formed only by one-time composition process, the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved.
Preferably, in the embedded touch screen provided in the embodiment of the invention, as shown in fig. 2, each of the first fingerprint detection electrodes 410 and each of the capacitance electrodes 300 are made of the same material in the same layer, and each of the second fingerprint detection electrodes 420 is made of the same material in the same layer. Thus, the patterns of the respective capacitor electrodes 300 and the respective first fingerprint detection electrodes 410 can be formed only by one-time composition process, and the patterns of the respective second fingerprint detection electrodes 420 can be formed only by one-time composition process, so that the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved.
In a specific implementation, as shown in fig. 2, the in-cell touch screen provided in the embodiment of the present invention further includes: an insulating layer 500 between each first fingerprint detection electrode 410 and each second fingerprint detection electrode 420.
In a specific implementation, in order that each of the first fingerprint detection electrodes does not affect uniformity of light transmittance of the in-cell touch screen during display, the in-cell touch screen provided by the embodiment of the present invention further includes: a black matrix layer between the array substrate and the opposite substrate;
the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each first fingerprint detection electrode on the array substrate.
In a specific implementation, in order that each second fingerprint detection electrode does not affect uniformity of light transmittance of the in-cell touch screen during display, the in-cell touch screen provided by the embodiment of the present invention further includes: a black matrix layer between the array substrate and the opposite substrate;
the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each second fingerprint detection electrode on the array substrate.
Preferably, in order to further not affect the uniformity of the light transmittance of the in-cell touch screen during displaying, in a specific implementation, the in-cell touch screen provided in the embodiment of the present invention further includes: a black matrix layer between the array substrate and the opposite substrate;
the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each first fingerprint detection electrode on the array substrate, and the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each second fingerprint detection electrode on the array substrate.
In a specific implementation, as shown in fig. 2, the in-cell touch screen provided in the embodiment of the present invention further includes: and a plurality of pixel units 600 between the array substrate 100 and the opposite substrate 200.
In a specific implementation, as shown in fig. 1, the in-cell touch screen provided in the embodiment of the present invention further includes: a driving chip 700 electrically connected to the respective capacitor electrode 300, the respective first fingerprint detection electrode 410, and the respective second fingerprint detection electrode 420;
the driving chip 700 is configured to apply a touch driving signal to each first fingerprint detection electrode 410 and each capacitance electrode 300 in a touch detection stage, and determine a touch position by detecting a change in capacitance value of each capacitance electrode 300 and a change in sum of capacitance values of each first fingerprint detection electrode;
in the fingerprint detection stage, fingerprint driving signals are sequentially loaded on the first fingerprint detection electrodes 410, and the information of the valleys and ridges of the fingerprint is judged by detecting the capacitance value change between the first fingerprint detection electrodes 410 and the second fingerprint detection electrodes 420; alternatively, the fingerprint driving signal is sequentially applied to each second fingerprint detection electrode 420, and the information of the valleys and ridges of the fingerprint is determined by detecting the capacitance variation between each first fingerprint detection electrode 410 and each second fingerprint detection electrode 420.
In the in-cell touch screen provided by the embodiment of the invention, since the orthographic projection of each first fingerprint detection electrode on the substrate is smaller than the orthographic projection of the area surrounded by the self-capacitance electrode on the substrate, so that the capacitance value of the self-capacitance electrode is larger than that of each first fingerprint detection electrode, the capacitance value of each first fingerprint detection electrode in the fingerprint detection area when forming the self-capacitance can be approximated to that of the self-capacitance electrode by adding the capacitance values of each first fingerprint detection electrode. When a finger touches the embedded display screen, touch driving signals are loaded on each first fingerprint detection electrode and each capacitance electrode in a touch detection stage, so that the touch position can be judged by detecting the capacitance value change of each capacitance electrode and the capacitance value sum change of each first fingerprint detection electrode.
In the fingerprint detection stage, use the fingerprint detection area to include X second fingerprint detection electrode and Y first fingerprint detection electrode, and drive chip loads the fingerprint drive signal to Y second fingerprint detection electrode in proper order for example, when loading the fingerprint drive signal to one second fingerprint detection electrode in Y first fingerprint detection electrode, read the fingerprint detection signal on each first fingerprint detection electrode respectively, consequently after loading the fingerprint drive signal to each second fingerprint detection electrode in proper order, can read X Y fingerprint detection signal, thereby can confirm the position of each first fingerprint detection electrode and each second fingerprint detection electrode's intersect according to these fingerprint detection signals that read, thereby can be specific the position of confirming the multiple spot, consequently can realize the detection to a plurality of valleys and the ridge of fingerprint simultaneously. When a finger touches the in-cell display screen, the capacitance between the first fingerprint detection electrodes and the second fingerprint detection electrodes changes. Because the ridge of fingerprint is nearer apart from first fingerprint detection electrode for the change of ridge to mutual capacitance is great, and the valley of fingerprint is far away from first fingerprint detection electrode, and is less to the change of mutual capacitance, consequently, can be through the information in order to judge the valley of fingerprint and ridge of weak electric current that the capacitance value change that detects between each first fingerprint detection electrode and each second fingerprint detection electrode leads to, thereby make embedded touch-sensitive screen realize the fingerprint detection function.
In a specific implementation, in a touch detection stage, in order to avoid that a coupling capacitance is generated between the second fingerprint detection electrode and the first fingerprint detection electrode to affect the accuracy of touch detection, in the embedded touch screen provided in the embodiment of the present invention, the driving chip is further configured to load an electrical signal, which is the same as the touch driving signal, to each of the second fingerprint detection electrodes in the touch detection stage.
In a specific implementation, in the embedded touch screen provided in an embodiment of the present invention, the driving chip includes: the device comprises a signal input unit, a touch detection unit and a fingerprint detection unit; wherein,
the signal input unit is used for applying touch driving signals to each first fingerprint detection electrode and each capacitance electrode in a touch detection stage; in the fingerprint detection stage, loading a fingerprint driving signal to each first fingerprint detection electrode in sequence, or in the fingerprint detection stage, loading a fingerprint driving signal to each second fingerprint detection electrode in sequence;
the touch detection unit is used for judging a touch position by detecting the change of capacitance values of the respective capacitance electrodes and detecting the change of the sum of the capacitance values of the fingerprint detection electrodes in a touch detection stage;
and the fingerprint detection unit is used for judging the information of the valleys and the ridges of the fingerprint by detecting the change of the capacitance value between the first fingerprint detection electrode and the second fingerprint detection electrode in the fingerprint detection stage.
In a specific implementation, in the in-cell touch screen provided in the embodiment of the present invention, when the driving chip sequentially loads the fingerprint driving signal to each of the second fingerprint detection electrodes in the fingerprint detection stage, as shown in fig. 3, the fingerprint detection unit includes: an amplifier P, a capacitor C and a switching device K; wherein,
an inverting input terminal P1 of the amplifier P is connected to the first fingerprint detection electrode 410, the first terminal of the capacitor C, and the first terminal of the switching device K, respectively, a non-inverting input terminal P2 of the amplifier P is connected to the ground terminal VSS, and an Output terminal P3 of the amplifier P is connected to the second terminal of the capacitor C, the second terminal of the switching device K, and the voltage Output terminal Output, respectively.
Or, in the in-cell touch screen provided in the embodiment of the present invention, when the driving chip sequentially loads the fingerprint driving signal to each of the first fingerprint detection electrodes in the fingerprint detection stage, the fingerprint detection unit includes: amplifiers, capacitors, and switching devices; wherein,
the inverting input end of the amplifier is connected with the second fingerprint detection electrode, the first end of the capacitor and the first end of the switch device respectively, the non-inverting input end of the amplifier is connected with the grounding end, and the output end of the amplifier is connected with the second end of the capacitor, the second end of the switch device and the voltage output end respectively.
In order to reduce the signal delay of the first fingerprint detection electrodes 410 and the signal delay of the second fingerprint detection electrodes 420, as shown in fig. 1, in the in-cell touch screen provided by the embodiment of the invention, the driving chip 700 is located at one side of the peripheral area of the in-cell touch screen surrounding the display area;
the fingerprint detection area 400 is located at a side of the display area closest to the driving chip 700.
Further, in the in-cell touch panel according to the embodiment of the invention, as shown in fig. 1, when the fingerprint driving signal is applied to each of the second fingerprint detection electrodes 420, each of the first fingerprint detection electrodes 410 extends in a direction perpendicular to the side of the peripheral area having the driving chip 700, and each of the second fingerprint detection electrodes 420 extends in a direction parallel to the side of the peripheral area having the driving chip 700. Therefore, the signal delay of the first fingerprint detection electrode for outputting the fingerprint detection signal can be further reduced, the driving frequency is improved, the noise influence is avoided, and the fingerprint detection precision is improved.
Alternatively, in a specific implementation, in the in-cell touch screen provided in the embodiment of the invention, when the fingerprint driving signal is applied to each first fingerprint detection electrode, each first fingerprint detection electrode extends along a direction parallel to a side of the peripheral area having the driving chip, and each second fingerprint detection electrode extends along a direction perpendicular to the side of the peripheral area having the driving chip. Therefore, the signal delay of the second fingerprint detection electrode for outputting the fingerprint detection signal can be further reduced, the driving frequency is improved, the noise influence is avoided, and the fingerprint detection precision is improved.
In a specific implementation, in the in-cell touch screen provided in the embodiment of the present invention, the array substrate may be a glass substrate; alternatively, the array substrate may be a flexible substrate. And is not limited herein.
In a specific implementation, in the in-cell touch screen provided in the embodiment of the present invention, the opposite substrate may be a glass substrate; alternatively, the counter substrate may be a flexible substrate, which is not limited herein.
In a specific implementation manner, in the in-cell touch screen provided by the embodiment of the present invention, the material of the flexible substrate is polyimide.
In a specific implementation manner, in the in-cell touch screen provided by the embodiment of the invention, the pattern of each capacitive electrode may be a grid-like structure located in an orthographic projection area of the black matrix on the substrate base plate in an orthographic projection of the substrate base plate.
In a specific implementation, the in-cell touch screen provided in the embodiment of the present invention further includes: wires corresponding one-to-one to the respective capacitive electrodes in the regions other than the fingerprint detection region; wherein,
and the capacitance electrodes in the areas except the fingerprint detection area are electrically connected with the driving chip through corresponding wires.
In a specific implementation manner, in the in-cell touch screen provided in the embodiment of the present invention, each pixel unit includes at least one organic electroluminescent structure;
when each first fingerprint detection electrode is located between each second fingerprint detection electrode and the array substrate, embedded touch-sensitive screen still includes: and the first packaging layer is positioned between the organic electroluminescent structure and each first fingerprint detection electrode.
Alternatively, in a specific implementation manner, in the in-cell touch screen provided in the embodiment of the present invention, as shown in fig. 2, each pixel unit 600 includes at least one organic electroluminescent structure;
when the second fingerprint detection electrodes 420 are located between the first fingerprint detection electrodes 410 and the array substrate 100, the in-cell touch screen further includes: and a second encapsulation layer 800 positioned between the organic electroluminescent structure and each second fingerprint detection electrode 420.
In practical implementation, in the in-cell touch screen provided by the embodiment of the invention, the array substrate and the opposite substrate are both flexible substrates,
when each first fingerprint detection electrode is positioned between each second fingerprint detection electrode and the array substrate, each capacitor electrode, each first fingerprint detection electrode and each second fingerprint detection electrode are manufactured on the first packaging layer by adopting a printing process; or,
when each second fingerprint detection electrode is positioned between each first fingerprint detection electrode and the array substrate, each capacitor electrode, each first fingerprint detection electrode and each second fingerprint detection electrode are manufactured and formed on the second packaging layer by adopting a printing process.
In a specific implementation manner, in the in-cell touch screen provided in the embodiment of the invention, the first encapsulation layer and the second encapsulation layer respectively include a first silicon nitride layer, a silicon carbonitride layer, and a second silicon nitride layer, which are stacked.
In a specific implementation, in the in-cell touch panel provided by the embodiment of the invention, the thickness of the first silicon nitride layer is 0.6 μm, the thickness of the silicon carbonitride layer is 0.5 μm, and the thickness of the second silicon nitride layer is 0.6 μm.
In practical implementation, the in-cell touch screen provided by the embodiment of the invention further includes a pixel defining layer located between two adjacent organic electroluminescent structures.
In specific implementation, the display chip for display and the driving chip provided by the embodiment of the invention can be integrated into one chip, so that the production cost of the in-cell touch screen provided by the embodiment of the invention can be further reduced.
Based on the same inventive concept, an embodiment of the present invention further provides a method for driving any one of the in-cell touch screens provided by the embodiment of the present invention, as shown in fig. 4, including: a touch detection stage and a fingerprint detection stage; wherein,
s401, in a touch detection stage, loading touch detection signals to each first fingerprint detection electrode and each capacitance electrode, and judging a touch position by detecting the change of capacitance values of each capacitance electrode and the change of the sum of the capacitance values of each first fingerprint detection electrode;
s402, in the fingerprint detection stage, loading fingerprint driving signals to the first fingerprint detection electrodes in sequence, and judging information of valleys and ridges of the fingerprint by detecting changes of capacitance values between the first fingerprint detection electrodes and the second fingerprint detection electrodes; or sequentially loading fingerprint driving signals to the second fingerprint detection electrodes, and judging the information of the valleys and the ridges of the fingerprint by detecting the change of the capacitance values between the first fingerprint detection electrodes and the second fingerprint detection electrodes.
Further, in practical implementation, in the driving method provided in an embodiment of the present invention, the method further includes: and in the touch detection stage, loading an electric signal which is the same as the touch driving signal to each second fingerprint detection electrode.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the embedded touch screen provided by the embodiment of the invention. The principle of the display device to solve the problems is similar to the in-cell touch screen, so the implementation of the display device can be referred to the implementation of the in-cell touch screen, and repeated details are not repeated herein.
In a specific implementation, in the display device provided in the embodiment of the present invention, the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention. The implementation of the display device can refer to the above embodiment of the package structure, and repeated descriptions are omitted.
According to the embedded touch screen, the driving method and the display device provided by the embodiment of the invention, when the embedded touch screen is touched by a finger, in a touch detection stage, each first fingerprint detection electrode in a fingerprint detection area forms a self-capacitance to realize detection of a touch position; in the fingerprint detection stage, each first fingerprint detection electrode and each second fingerprint detection electrode in the fingerprint detection area can form mutual capacitance, because the influence of the valley and the ridge of finger fingerprint to the capacitance value of the mutual capacitance that forms is different, consequently can detect the information of the valley and the ridge of fingerprint through the change of the capacitance value that detects between each mutual capacitance to can make embedded touch-sensitive screen realize the fingerprint detection function.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. An in-cell touch screen, comprising: the touch screen comprises an array substrate, an opposite substrate and a plurality of self-capacitance electrodes, wherein the array substrate and the opposite substrate are arranged oppositely, and the self-capacitance electrodes are positioned between the array substrate and the opposite substrate;
the fingerprint detection area further comprises a plurality of mutually independent second fingerprint detection electrodes positioned between the array substrate and the opposite substrate, and each second fingerprint detection electrode and each first fingerprint detection electrode are arranged in a crossed mode and are mutually insulated;
in a touch detection stage, each first fingerprint detection electrode forms a self-capacitance for detecting a touch position; in a fingerprint detection stage, each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes form a mutual capacitance for detecting a fingerprint.
2. The in-cell touch screen of claim 1, wherein each of the first fingerprint detection electrodes is located between each of the second fingerprint detection electrodes and the array substrate; or,
each second fingerprint detection electrode is located between each first fingerprint detection electrode and the array substrate.
3. The in-cell touch screen of claim 1, wherein each of the first fingerprint detection electrodes is made of the same material as each of the self-capacitance electrodes; and/or the presence of a gas in the gas,
and the second fingerprint detection electrodes are made of the same material in the same layer.
4. The in-cell touch screen of claim 1, further comprising: and the insulating layer is positioned between each first fingerprint detection electrode and each second fingerprint detection electrode.
5. The in-cell touch screen of any of claims 1-4, further comprising: a black matrix layer between the array substrate and the opposite substrate;
the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each first fingerprint detection electrode on the array substrate; and/or the presence of a gas in the gas,
and the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each second fingerprint detection electrode on the array substrate.
6. The in-cell touch screen of any of claims 1-4, further comprising: the driving chip is electrically connected with each self-capacitance electrode, each first fingerprint detection electrode and each second fingerprint detection electrode;
the driving chip is used for applying a touch driving signal to each first fingerprint detection electrode and each self-capacitance electrode in the touch detection stage, and judging a touch position by detecting the change of capacitance values of each self-capacitance electrode and the change of the sum of the capacitance values of each first fingerprint detection electrode;
in the fingerprint detection stage, loading fingerprint driving signals to the first fingerprint detection electrodes in sequence, and judging the information of the valleys and ridges of the fingerprint by detecting the capacitance value change between the first fingerprint detection electrodes and the second fingerprint detection electrodes; or, sequentially loading a fingerprint driving signal to each second fingerprint detection electrode, and determining information of valleys and ridges of a fingerprint by detecting capacitance changes between each first fingerprint detection electrode and each second fingerprint detection electrode.
7. The in-cell touch screen of claim 6, wherein the driver chip is further configured to apply an electrical signal to each of the second fingerprint detection electrodes during the touch detection phase, the electrical signal being identical to the touch driving signal.
8. The in-cell touch screen of claim 7, wherein the driver chips are located at one side of a peripheral area of the in-cell touch screen surrounding a display area;
the fingerprint detection area is located at the side edge of the display area which is closest to the driving chip.
9. The in-cell touch panel of claim 6, wherein when a fingerprint driving signal is applied to each of the first fingerprint detection electrodes, each of the first fingerprint detection electrodes extends in a direction parallel to a side of the peripheral area having the driving chip, and each of the second fingerprint detection electrodes extends in a direction perpendicular to the side of the peripheral area having the driving chip; or,
when a fingerprint driving signal is applied to each of the second fingerprint detection electrodes, each of the first fingerprint detection electrodes extends in a direction perpendicular to the side of the peripheral area having the driving chip, and each of the second fingerprint detection electrodes extends in a direction parallel to the side of the peripheral area having the driving chip.
10. A display device comprising the in-cell touch screen of any of claims 1-9.
11. The method for driving the in-cell touch screen according to any one of claims 6 to 9, comprising: a touch detection stage and a fingerprint detection stage; wherein,
in the touch detection stage, loading touch detection signals to each first fingerprint detection electrode and each self-capacitance electrode, and judging a touch position by detecting the change of capacitance values of each self-capacitance electrode and the change of the sum of the capacitance values of each first fingerprint detection electrode;
in the fingerprint detection stage, loading fingerprint driving signals to the first fingerprint detection electrodes in sequence, and judging the information of the valleys and ridges of the fingerprint by detecting the change of capacitance values between the first fingerprint detection electrodes and the second fingerprint detection electrodes; or, sequentially loading a fingerprint driving signal to each second fingerprint detection electrode, and determining information of valleys and ridges of the fingerprint by detecting a change in capacitance value between each first fingerprint detection electrode and each second fingerprint detection electrode.
12. The driving method according to claim 11, further comprising: and in the touch detection stage, loading an electric signal which is the same as the touch driving signal to each second fingerprint detection electrode.
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