CN106249973B - A kind of In-cell touch panel, its driving method and display device - Google Patents

Abstract

The invention discloses a kind of In-cell touch panel, its driving method and display devices, and when being touched by finger, each first fingerprint detection electrode in the touch control detection stage, fingerprint detection region forms the detection that self-capacitance realizes 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, since influence of the valley and a ridge to the capacitance of the mutual capacitance of formation of finger print is different, therefore the information of the valley and a ridge of fingerprint can be detected by detecting the variation of the capacitance between each mutual capacitance, so as to so that In-cell touch panel realizes fingerprint detection function.

Description

An in-cell touch screen, its driving method and display device

technical field

The present invention relates to the field of display technology, and in particular, to an in-cell touch screen, a driving method thereof and a display device.

Background technique

With the rapid development of technology, mobile products with biometric functions have gradually entered people's lives. Since a fingerprint is an innate and unique feature of the human body that can be distinguished from others, it consists of a series of valleys and ridges on the skin surface of the fingertips. The compositional details of these valleys and ridges usually include Details such as ends, arches, tent arches, left-handed, right-handed, helical or double-handed, which determine the unique characteristics of fingerprints, have received extensive attention. At present, people have integrated the pressing and sliding fingerprint recognition technology based on silicon-based technology into mobile products. In the future, the core of people's attention is to apply fingerprint recognition technology in the display area of the display panel, so that the display panel has the fingerprint recognition function. .

Therefore, how to realize the fingerprint recognition function in the display area of the display panel is a technical problem to be solved urgently by those skilled in the art.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide an in-cell touch screen, a driving method thereof, and a display device, which are used to enable the 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, comprising: an array substrate and an opposite substrate disposed opposite to each other, and a plurality of self-capacitance electrodes located between the array substrate and the opposite substrate, the The in-cell touch screen further includes a fingerprint detection area, and the self-capacitance electrodes located in the fingerprint detection area are composed of a plurality of mutually independent first fingerprint detection electrodes;

The fingerprint detection area further includes a plurality of mutually independent second fingerprint detection electrodes located between the array substrate and the opposite substrate, and each of the second fingerprint detection electrodes and each of the first fingerprint detection electrodes Crossed and insulated from each other;

In the touch detection stage, each of the first fingerprint detection electrodes forms a self-capacitance for detecting the touch position; in the fingerprint detection stage, each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes form a mutual capacitance for to detect fingerprints.

Preferably, in the above 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 of the second fingerprint detection electrodes is located between each of the first fingerprint detection electrodes and the array substrate.

Preferably, in the above 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 of the same layer and the same material; and/or,

Each of the second fingerprint detection electrodes is of the same layer and the same material.

Preferably, the in-cell touch screen provided in the embodiment of the present invention further comprises: an insulating layer located between each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes.

Preferably, the in-cell touch screen provided in the embodiment of the present invention further includes: a black matrix layer located 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 of the first fingerprint detection electrodes on the array substrate; and/or,

The orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of each of the second fingerprint detection electrodes on the array substrate.

Preferably, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, it further comprises: a device electrically connected to each of the self-capacitance electrodes, each of the first fingerprint detection electrodes, and each of the second fingerprint detection electrodes. driver chip;

The driving chip is used for, in the touch detection stage, to apply a touch driving signal to each of the first fingerprint detection electrodes and each of the self-capacitance electrodes, and to detect the difference of the capacitance value of each of the self-capacitance electrodes. change and detect the change of the sum of the capacitance values of the first fingerprint detection electrodes to determine the touch position;

In the fingerprint detection stage, a fingerprint driving signal is loaded on each of the first fingerprint detection electrodes in turn, and the judgment is made by detecting the change of the capacitance value between each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes. information of the valleys and ridges of the fingerprint; or, sequentially load the fingerprint driving signal to each of the second fingerprint detection electrodes, and detect the capacitance value between each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes Change to determine the information of the valleys and ridges of the fingerprint.

Preferably, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, the driving chip is further used for, in the touch detection stage, to load each of the second fingerprint detection electrodes with the touch drive. The same electrical signal.

Preferably, in the above in-cell touch screen provided by the embodiment of the present invention, the driver chip is located at one side of a peripheral area of the in-cell touch screen surrounding the display area;

The fingerprint detection area is located at the side of the display area closest to the driving chip.

Preferably, in the above-mentioned in-cell touch screen provided by 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 is parallel to the driving chip with the driver chip. extending in the direction of the side of the peripheral region of the driver chip, and each of the second fingerprint detection electrodes extends in a direction perpendicular to the side of the peripheral region with the driver 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 with the peripheral region of the driving chip, and each of the second fingerprint detection electrodes extending in a direction parallel to the side of the peripheral region having the driving chip.

Correspondingly, an embodiment of the present invention further provides a display device, including any of the above-mentioned in-cell touch screens provided by the embodiment of the present invention.

Correspondingly, the embodiments of the present invention also provide a method for driving any of the above 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, a touch detection signal is applied to each of the first fingerprint detection electrodes and each of the self-capacitance electrodes, and the change of the capacitance value of each of the self-capacitance electrodes and the detection of each of the first fingerprint detection electrodes are detected. A fingerprint detects the change of the sum of the capacitance values of the electrodes to determine the touch position;

In the fingerprint detection stage, a fingerprint driving signal is sequentially applied to each of the first fingerprint detection electrodes, and the change of the capacitance value between each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes is detected to obtain Determine the information of the valleys and ridges of the fingerprint; or, sequentially load the fingerprint driving signal to each of the second fingerprint detection electrodes, and detect the gap between each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes. The change of the capacitance value to judge the information of the valley and ridge of the fingerprint.

Preferably, in the above driving method provided by the embodiment of the present invention, the method further includes: in the touch detection stage, applying the same electrical signal as the touch driving signal to each of the second fingerprint detection electrodes.

In the in-cell touch screen, the driving method thereof, and the display device provided by the embodiments of the present invention, when touched by a finger, in the touch detection stage, each first fingerprint detection electrode in the fingerprint detection area forms a self-capacitance to realize the detection of the 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 a mutual capacitance, because the valleys and ridges of the fingerprint have different influences on the capacitance value of the formed mutual capacitance, so it can be The information of the valleys and ridges of the fingerprint is detected by detecting the change of the capacitance value between the mutual capacitances, so that the in-cell touch screen can realize the fingerprint detection function.

Description of drawings

FIG. 1 is a schematic top view of an in-cell touch screen according to an embodiment of the present invention;

2 is a schematic cross-sectional structure diagram of an in-cell touch screen along the A-A' direction provided by an embodiment of the present invention;

3 is a schematic diagram of a specific structure 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 provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the specific implementations of the in-cell touch screen, its driving method and the display device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The thickness, shape, relative size, and number of each layer of the film in the drawings do not reflect the real scale of the in-cell touch screen, and are only intended to illustrate the content of the present invention.

An in-cell touch screen provided by an embodiment of the present invention, as shown in FIG. 1 , includes: an array substrate and an opposite substrate disposed opposite to each other, and a plurality of self-capacitance electrodes 300 located between the array substrate and the opposite substrate. The in-cell touch screen further includes a fingerprint detection area 400, and the self-capacitance electrodes located 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 of the second fingerprint detection electrodes 420 and each of the first fingerprint detection electrodes 410 are arranged crosswise and insulated from each other;

In the touch detection stage, each first fingerprint detection electrode 410 forms a self-capacitance for detecting the touch position; in the fingerprint detection stage, each first fingerprint detection electrode 410 and each second fingerprint detection electrode 420 form a mutual capacitance for detecting fingerprints .

In the above in-cell touch screen provided by the embodiment of the present invention, when touched by a finger, in the touch detection stage, each first fingerprint detection electrode in the fingerprint detection area forms a self-capacitance to detect the 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 a mutual capacitance. Since the valleys and ridges of the fingerprint have different influences on the capacitance value of the formed mutual capacitance, the mutual capacitance can be detected by detecting the difference between the mutual capacitances. The change of the capacitance value between the two can detect the information of the valley and ridge of the fingerprint, so that the in-cell touch screen can realize the fingerprint detection function.

In the specific implementation, in the above-mentioned in-cell touch screen provided by 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 stage, in the above-mentioned embodiment of the present invention In the in-cell touch screen, in order to reduce the mutual interference between the touch detection stage and the fingerprint detection stage, the touch detection stage and the fingerprint detection stage need to be driven in a time-sharing manner.

During specific implementation, in the above-mentioned in-cell touch screen provided by 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 detection electrode; or, each of the second fingerprint detection electrodes is a driving electrode , each first fingerprint detection electrode is a detection electrode. The driving electrodes are loaded with fingerprint driving signals, and the detection electrodes output fingerprint detection signals.

During specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present 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 . In this way, 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 a self-capacitance can be avoided, so that the signal generated by each first fingerprint detection electrode 410 is relatively small. big.

Alternatively, in the specific implementation, in the above-mentioned 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. In this way, 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 formed by the self-capacitance may occur, so that the signal generated by the first fingerprint detection electrode 410 is relatively small. Small.

During specific implementation, in the above in-cell touch screen provided by the embodiment of the present invention, as shown in FIG. 2 , each of the first fingerprint detection electrodes 410 and the respective capacitive electrodes 300 are of the same layer and the same material. In this way, there is no need to add an additional process for preparing each of the first fingerprint detection electrodes 410, and only one patterning process is needed to form the patterns of the respective capacitor electrodes 300 and each of the first fingerprint detection electrodes 410, which can simplify the preparation process and save production costs. Increase productivity.

During specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, as shown in FIG. 2 , each of the second fingerprint detection electrodes 420 is of the same layer and the same material. In this way, the pattern of each second fingerprint detection electrode 420 can be formed by only one patterning process, which can simplify the preparation process, save the production cost, and improve the production efficiency.

Preferably, in the specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, as shown in FIG. 2 , each of the first fingerprint detection electrodes 410 and the respective capacitive electrodes 300 are of the same layer and of the same material, and each of the second fingerprint detection electrodes 410 is of the same layer and the same material. The fingerprint detection electrodes 420 are made of the same layer and the same material. In this way, the pattern of each capacitor electrode 300 and each first fingerprint detection electrode 410 can be formed only by one patterning process, and the pattern of each second fingerprint detecting electrode 420 can be formed by only one patterning process, which can simplify the preparation process. Save production costs and improve production efficiency.

During specific implementation, the in-cell touch screen provided in the embodiment of the present invention, as shown in FIG. 2 , further includes: an insulating layer 500 located between each of the first fingerprint detection electrodes 410 and each of the second fingerprint detection electrodes 420 . .

During specific implementation, in order to prevent the first fingerprint detection electrodes from affecting the uniformity of light transmittance of the in-cell touch screen during display, the in-cell touch screen provided in the embodiment of the present invention further includes: the black matrix layer between the opposing substrates;

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.

During specific implementation, in order to prevent the second fingerprint detection electrodes from affecting the uniformity of light transmittance of the in-cell touch screen during display, the in-cell touch screen provided in the embodiment of the present invention further includes: the black matrix layer between the opposing substrates;

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 not to further affect the uniformity of light transmittance of the in-cell touch screen during display, during specific implementation, in the above in-cell touch screen provided by the embodiment of the present invention, it further includes: black matrix layer between substrates;

The orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of the first fingerprint detection electrodes on the array substrate, and the orthographic projection of the black matrix layer on the array substrate covers the orthographic projection of the second fingerprint detection electrodes on the array substrate.

During specific implementation, the in-cell touch screen provided in the embodiment of the present invention, as shown in FIG. 2 , further includes: a plurality of pixel units 600 located between the array substrate 100 and the opposite substrate 200 .

During specific implementation, the in-cell touch screen provided by the embodiment of the present invention, as shown in FIG. 1 , further includes: electrical connection with each capacitive electrode 300 , each first fingerprint detection electrode 410 , and each second fingerprint detection electrode 420 . Sexually connected driver chip 700;

The driving chip 700 is used for, in the touch detection stage, to apply a touch driving signal to each of the first fingerprint detection electrodes 410 and the respective capacitive electrodes 300 , and to detect changes in the capacitance values of the respective capacitive electrodes 300 and to detect the first fingerprint detection Changes in the sum of the capacitance values of the electrodes to determine the touch position;

In the fingerprint detection stage, each first fingerprint detection electrode 410 is loaded with a fingerprint driving signal in turn, and the valley and ridge of the fingerprint are determined by detecting the change of the capacitance value between each first fingerprint detection electrode 410 and each second fingerprint detection electrode 420 Or, load the fingerprint driving signal to each second fingerprint detection electrode 420 in turn, and judge the valley and ridge of the fingerprint by detecting the change of capacitance value between each first fingerprint detection electrode 410 and each second fingerprint detection electrode 420 Information.

It should be noted that, in the above in-cell touch screen provided by the embodiment of the present invention, since the orthographic projection of each first fingerprint detection electrode on the base substrate is smaller than the orthographic projection of the area enclosed by the self-capacitance electrodes on the base substrate, The capacitance value of the self-capacitance electrode is made larger than the capacitance value of each first fingerprint detection electrode. Therefore, by adding the capacitance values of each first fingerprint detection electrode, each first fingerprint detection electrode in the fingerprint detection area can form a self-capacitance value. The capacitance value is similar to that of the self-capacitance electrode. When a finger touches the in-cell display screen, in the touch detection stage, each first fingerprint detection electrode and each capacitive electrode are loaded with a touch driving signal, so that the change of the capacitance value of each capacitive electrode can be detected and each first fingerprint can be detected Changes in the sum of the capacitance values of the electrodes are detected to determine the touch position.

In the fingerprint detection stage, take the fingerprint detection area including X second fingerprint detection electrodes and Y first fingerprint detection electrodes as an example, and the driver chip loads the fingerprint driving signals on Y second fingerprint detection electrodes in sequence, when the Y second fingerprint detection electrodes are loaded with fingerprint driving signals as an example, When a second fingerprint detection electrode in a fingerprint detection electrode is loaded with a fingerprint driving signal, the fingerprint detection signal on each of the first fingerprint detection electrodes is read respectively. Therefore, after the fingerprint driving signal is loaded on each second fingerprint detection electrode in turn, the Read X×Y fingerprint detection signals, so that the position of the intersection of each first fingerprint detection electrode and each second fingerprint detection electrode can be determined according to the read fingerprint detection signals, so that the positions of multiple points can be specifically determined. Therefore, The detection of multiple valleys and ridges of the fingerprint can be achieved simultaneously. When a finger touches the in-cell display screen, it is equivalent to a change in the capacitance value between each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes. Since the ridge of the fingerprint is closer to the first fingerprint detection electrode, the change of the ridge to the mutual capacitance is large, while the valley of the fingerprint is farther from the first fingerprint detection electrode, and the change to the mutual capacitance is small. The weak current caused by the change of the capacitance value between the first fingerprint detection electrode and each second fingerprint detection electrode is used to judge the information of the valley and ridge of the fingerprint, so that the in-cell touch screen can realize the fingerprint detection function.

During the specific implementation, in the touch detection stage, in order to avoid coupling capacitance between the second fingerprint detection electrode and the first fingerprint detection electrode, thereby affecting the accuracy of the touch detection, the in-cell touch screen provided in the embodiment of the present invention Among them, the driving chip is also used for, in the touch detection stage, to load each second fingerprint detection electrode with the same electrical signal as the touch driving signal.

During specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, the driving chip includes: a signal input unit, a touch detection unit, and a fingerprint detection unit; wherein,

The signal input unit is used for applying a touch driving signal to each of the first fingerprint detection electrodes and the respective capacitive electrodes in the touch detection stage; in the fingerprint detection stage, sequentially loading the fingerprint driving signal to each of the first fingerprint detection electrodes, or, in the fingerprint detection stage In the fingerprint detection stage, the fingerprint driving signals are sequentially loaded on each of the second fingerprint detection electrodes;

The touch detection unit is used to determine the touch position by detecting the change of the capacitance value of each capacitive electrode and the change of the sum of the capacitance value of each fingerprint detection electrode in the touch detection stage;

The fingerprint detection unit is used for, in the fingerprint detection stage, to determine the information of the valleys and 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 specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, when the driver chip sequentially loads each second fingerprint detection electrode with a fingerprint driving signal in the fingerprint detection stage, as shown in FIG. 3 , the fingerprint detection unit includes: : Amplifier P, capacitor C and switching device K; where,

The inverting input terminal p1 of the amplifier P is respectively connected to the first fingerprint detection electrode 410, the first terminal of the capacitor C and the first terminal of the switching device K, the non-inverting input terminal p2 of the amplifier P is connected to the ground terminal VSS, and the output of the amplifier P The terminal p3 is respectively connected to the second terminal of the capacitor C, the second terminal of the switching device K and the voltage output terminal Output.

Alternatively, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, when the driver chip sequentially loads each first fingerprint detection electrode with a fingerprint driving signal in the fingerprint detection stage, the fingerprint detection unit includes: an amplifier, a capacitor and a switch device; wherein ,

The inverting input end of the amplifier is respectively connected with the second fingerprint detection electrode, the first end of the capacitor and the first end of the switching device, the non-inverting input end of the amplifier is connected with the grounding end, and the output end of the amplifier is respectively connected with the second end of the capacitor, The second terminal of the switching device is connected to the voltage output terminal.

During specific implementation, in order to reduce the signal delay of each first fingerprint detection electrode 410 and the signal delay of each second fingerprint detection electrode 420, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, as shown in FIG. 1 , The driver 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 the side of the display area closest to the driving chip 700 .

Further, in the specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, as shown in FIG. 1 , when each second fingerprint detection electrode 420 is loaded with a fingerprint driving signal, each first fingerprint detection electrode 410 Extending in a direction perpendicular to the side with the peripheral area of the driving chip 700 , each of the second fingerprint detection electrodes 420 extends in a direction parallel to the side of the peripheral area with the driving chip 700 . In this way, the signal delay of the first fingerprint detection electrode for outputting the fingerprint detection signal can be further reduced, the driving frequency can be increased, the influence of noise can be avoided, and the precision of fingerprint detection can be improved.

Or, in specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, when each first fingerprint detection electrode is loaded with a fingerprint driving signal, the edge of each first fingerprint detection electrode is parallel to the peripheral area with the driving chip. The second fingerprint detection electrodes extend in a direction perpendicular to the side of the peripheral region having the driving chip. In this way, the signal delay of the second fingerprint detection electrode for outputting the fingerprint detection signal can be further reduced, the driving frequency can be increased, the influence of noise can be avoided, and the detection accuracy of the fingerprint can be improved.

During specific implementation, in the above in-cell touch screen provided by the embodiments of the present invention, the array substrate may be a glass substrate; or, the array substrate may also be a flexible substrate. It is not limited here.

During specific implementation, in the above in-cell touch screen provided by the embodiment of the present invention, the opposite substrate may be a glass substrate; or, the opposite substrate may also be a flexible substrate, which is not limited herein.

During specific implementation, in the above in-cell touch screen provided by the embodiment of the present invention, the material of the flexible substrate is polyimide.

In specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, the pattern of each capacitive electrode may be a grid-like structure in which the orthographic projection of the base substrate is located in the orthographic projection area of the black matrix on the base substrate .

During specific implementation, the above-mentioned in-cell touch screen provided by the embodiment of the present invention further includes: wires corresponding to the respective capacitive electrodes one-to-one in areas other than the fingerprint detection area; wherein,

The respective capacitive electrodes in the regions other than the fingerprint detection region are electrically connected to the driving chip through corresponding wires.

During specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, each pixel unit includes at least one organic electroluminescence structure;

When each of the first fingerprint detection electrodes is located between each of the second fingerprint detection electrodes and the array substrate, the in-cell touch screen further includes: a first encapsulation layer located between the organic electroluminescence structure and each of the first fingerprint detection electrodes.

Alternatively, during specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, as shown in FIG. 2 , each pixel unit 600 includes at least one organic electroluminescence structure;

When each of the second fingerprint detection electrodes 420 is located between each of the first fingerprint detection electrodes 410 and the array substrate 100 , the in-cell touch screen further includes: a second fingerprint detection electrode 420 located between the organic electroluminescence structure and each of the second fingerprint detection electrodes 420 . Encapsulation layer 800 .

During specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, the array substrate and the opposite substrate are both flexible substrates,

When each of the first fingerprint detection electrodes is located between each of the second fingerprint detection electrodes and the array substrate, each of the capacitor electrodes, each of the first fingerprint detection electrodes and each of the second fingerprint detection electrodes are formed on the first packaging layer by a printing process. ; or,

When each second fingerprint detection electrode is located 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 all formed on the second packaging layer by a printing process. of.

In specific implementation, in the above-mentioned in-cell touch screen provided by the embodiment of the present invention, the first encapsulation layer and the second encapsulation layer respectively include a first silicon nitride layer, a silicon nitride carbide layer and a second nitride layer which are arranged in layers. silicon layer.

In specific implementation, in the above in-cell touch screen provided by the embodiment of the present invention, the film thickness of the first silicon nitride layer is 0.6 μm, the film thickness of the silicon nitride carbide layer is 0.5 μm, and the film thickness of the second silicon nitride layer is 0.5 μm. The film thickness was 0.6 μm.

During specific implementation, the in-cell touch screen provided by the embodiment of the present invention further includes a pixel defining layer located between two adjacent organic electroluminescent structures.

In specific implementation, the display chip for display and the above-mentioned driving chip provided by the embodiment of the present invention can also be integrated into one chip, which can further reduce the production cost of the above-mentioned in-cell touch screen provided by the embodiment of the present invention.

Based on the same inventive concept, an embodiment of the present invention also provides a driving method for any of the above-mentioned 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 the touch detection stage, load a touch detection signal on each of the first fingerprint detection electrodes and the respective capacitive electrodes, and detect changes in the capacitance values of the respective capacitive electrodes and detect the sum of the capacitance values of the first fingerprint detection electrodes. change to determine the touch position;

S402. In the fingerprint detection stage, load the fingerprint driving signal to each first fingerprint detection electrode in turn, and determine the valley and ridge of the fingerprint by detecting the change of the capacitance value between each first fingerprint detection electrode and each second fingerprint detection electrode Or, load the fingerprint driving signal to each second fingerprint detection electrode in turn, and determine the information of the valley and ridge of the fingerprint by detecting the change of the capacitance value between each first fingerprint detection electrode and each second fingerprint detection electrode .

Further, during specific implementation, in the above driving method provided by the embodiment of the present invention, the method further includes: in the touch detection stage, applying the same electrical signal as the touch driving signal to each of the second fingerprint detection electrodes.

Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the above-mentioned in-cell touch screen provided by the embodiment of the present invention. The problem-solving principle of the display device is similar to that of the aforementioned in-cell touch screen. Therefore, the implementation of the display device can refer to the aforementioned implementation of the in-cell touch screen, and the repetition is not repeated here.

In specific implementation, in the above-mentioned display device provided by the embodiment of the present invention, the display device may be any product or component with display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like. Other essential components of the display device should be understood by those of ordinary skill in the art, and will not be repeated here, nor should it be regarded as a limitation of the present invention. For the implementation of the display device, reference may be made to the above-mentioned embodiments of the packaging structure, and repeated descriptions will not be repeated.

In the in-cell touch screen, the driving method thereof, and the display device provided by the embodiments of the present invention, when touched by a finger, in the touch detection stage, each first fingerprint detection electrode in the fingerprint detection area forms a self-capacitance to realize the detection of the 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 a mutual capacitance, because the valleys and ridges of the fingerprint have different influences on the capacitance value of the formed mutual capacitance, so it can be The information of the valleys and ridges of the fingerprint is detected by detecting the change of the capacitance value between the mutual capacitances, so that the in-cell touch screen can realize the fingerprint detection function.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these 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 these 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.