CN111079667A - Display panel, display device, fingerprint unlocking method and touch method - Google Patents
Display panel, display device, fingerprint unlocking method and touch method Download PDFInfo
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- CN111079667A CN111079667A CN201911327541.4A CN201911327541A CN111079667A CN 111079667 A CN111079667 A CN 111079667A CN 201911327541 A CN201911327541 A CN 201911327541A CN 111079667 A CN111079667 A CN 111079667A
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- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
Abstract
The invention provides a display panel, display equipment, a fingerprint unlocking method and a touch method, wherein the display panel comprises a substrate, a driving circuit and a plurality of fingerprint identification units positioned above the substrate, each fingerprint identification unit comprises a trigger module and a photosensitive module, and the driving circuit is electrically connected with the trigger module and the photosensitive module respectively; the triggering module generates a first electric signal after being triggered and transmits the first electric signal to the driving circuit, and the driving circuit controls the photosensitive module to scan fingerprints according to the first electric signal so as to acquire fingerprint information. The triggering action of the user during unlocking is sensed through the triggering module to generate an electric signal, and the driving circuit receives the electric signal and then controls the photosensitive module to perform fingerprint scanning, so that the fingerprint information of the user is obtained, and full-screen fingerprint identification is realized.
Description
Technical Field
The invention relates to the field of display, in particular to a display panel, display equipment, a fingerprint unlocking method and a touch method.
Background
The fingerprint is a line formed by linearly arranged bulges and depressions on the epidermis layer of the finger. Because the fingerprint has the characteristics of life invariance, uniqueness and the like, the fingerprint identification technology is widely applied to various display devices such as mobile phones, tablet computers, notebook computers and the like.
The existing fingerprint identification technology is divided into identification technologies such as capacitance type fingerprint identification, ultrasonic fingerprint identification and optical fingerprint identification, and the comprehensive screen requires that entity keys such as a fingerprint identification module and the like are cancelled so as to improve the screen occupation ratio. Therefore, integrating fingerprint identification into a display panel to realize fingerprint identification is a technical problem to be solved in the field.
Disclosure of Invention
The invention provides a display panel with a fingerprint identification function, display equipment, a fingerprint identification method and a touch method.
The invention provides a display panel, which comprises a substrate, a driving circuit and a plurality of fingerprint identification units positioned above the substrate, wherein each fingerprint identification unit comprises a trigger module and a photosensitive module; the triggering module generates a first electric signal after being triggered and transmits the first electric signal to the driving circuit, and the driving circuit controls the photosensitive module to scan fingerprints according to the first electric signal so as to acquire fingerprint information.
Further, after the trigger module is triggered, the driving circuit determines a pressed area according to the first electric signal, and controls the photosensitive module to perform fingerprint scanning on the pressed area to acquire fingerprint information.
Further, the photosensitive module is configured to generate a second electrical signal according to a change of ambient light and transmit the second electrical signal to the driving circuit, and the driving circuit determines the touch position according to the second electrical signal.
Further, the trigger module comprises a piezoelectric structure layer, and the piezoelectric structure layer generates an electric signal after being pressed.
Furthermore, the display panel comprises a support column formed on the piezoelectric structure layer and a substrate formed on the support column, the orthographic projection of the support column and the orthographic projection of the piezoelectric structure layer on the substrate are at least partially overlapped, and the support column is used for transmitting the stress of the substrate to the piezoelectric structure layer.
Further, the display panel comprises a plurality of thin film transistors formed on the substrate, and the triggering module and the photosensitive module are formed on the thin film transistors.
Further, the display panel comprises a plurality of first data lines extending along the longitudinal direction, the first data lines are electrically connected with the trigger module and the driving circuit, and the first data lines are electrically connected with the photosensitive module and the driving circuit.
Further, the photosensitive module comprises a PIN silicon photodiode, the PIN silicon photodiode comprises an N-type layer, an I-type layer and a P-type layer which are sequentially arranged upwards, and the thickness of the I-type layer is larger than that of the N-type layer and that of the P-type layer.
Furthermore, the display panel comprises a plurality of first grid lines extending along the transverse direction, the first grid lines are electrically connected with the P-type layer, and the first data lines are electrically connected with the driving circuit and the N-type layer.
Further, the display panel has a plurality of pixels, and the projection of the first data line on the substrate is located between the projections of two adjacent pixels on the substrate in the transverse direction.
Further, the display panel has a plurality of pixel regions, each pixel region includes a plurality of pixels, and each photosensitive module corresponds to one pixel region.
The invention also provides a display device comprising the display panel as described above.
The invention also provides a fingerprint unlocking method, which is used for the display panel or the display equipment, and the fingerprint unlocking method comprises the following steps: converting the pressing operation of the user into a first electric signal; determining a compressed area according to the first electric signal; collecting fingerprint information of a pressed area; judging whether the acquired fingerprint information is matched with preset fingerprint information or not; and if the acquired fingerprint information is matched with the preset fingerprint information, unlocking the display screen.
The invention also provides a touch method for the display device, which comprises the following steps: converting the ambient light change caused by touch operation into a second electric signal; determining a touch position according to the second electric signal; and responding to touch operation based on the touch position.
According to the invention, the triggering action of the user during unlocking is sensed through the triggering module to generate an electric signal, and the driving circuit receives the electric signal and controls the photosensitive module to perform fingerprint scanning, so that the fingerprint information of the user is obtained, full-screen fingerprint identification is realized, and compared with the method that fingerprint unlocking can be performed only at a fixed position, the efficiency of fingerprint unlocking is greatly improved.
Drawings
Fig. 1 is a partial schematic structural diagram of an embodiment of a display panel according to the present invention.
Fig. 2 is a schematic top view of a portion of the display panel shown in fig. 1.
Fig. 3 is a schematic diagram of an equivalent circuit of the display panel of fig. 1 for implementing fingerprint identification and touch control.
FIG. 4 is a schematic diagram of the division of the pixel region according to the present invention.
Fig. 5 is a flowchart illustrating an embodiment of a fingerprint unlocking method according to the present invention.
Fig. 6 is a flowchart illustrating a touch method according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, in this embodiment, the display panel includes a substrate 1, a driving circuit 4 disposed above the substrate 1, and a fingerprint identification unit, where the fingerprint identification unit includes a trigger module 3 and a photosensitive module 5, the driving circuit 4 is electrically connected to the trigger module 3 and the photosensitive module 5, the trigger module 3 generates a first electrical signal and transmits the first electrical signal to the driving circuit 4 after being triggered by a touch operation of a user, and the driving circuit 4 controls the photosensitive module 5 to perform fingerprint scanning according to the first electrical signal to obtain fingerprint information of the user. Optionally, when a finger is placed above the photosensitive module 5 (i.e., the display panel), part of the ambient light enters the valley and the ridge of the finger, and the reflected light enters the photosensitive module 5 after being reflected by the finger, and due to the difference in light intensity of the reflected light reflected by the valley and the ridge of the finger to the photosensitive module 5, the photocurrent generated by the photosensitive module 5 is different, and the fingerprint information of the user is further acquired. According to the invention, the triggering action of the user during unlocking is sensed through the triggering module to generate an electric signal, the drive circuit receives the electric signal and then controls the photosensitive module to perform fingerprint scanning, so that the fingerprint information of the user is obtained, full-screen fingerprint identification is realized, compared with the method that fingerprint unlocking can be performed only at a fixed position, the efficiency of fingerprint unlocking is greatly improved, and meanwhile, the screen occupation ratio of the display equipment with the display panel is favorably improved.
It should be noted that the direction of the substrate 1 pointing to the photosensitive module 5 in the present invention is an upward direction. If the placing direction of the display panel is changed, the upward direction is also changed.
The trigger module 3 comprises a piezoelectric structure layer, and the piezoelectric structure layer generates an electric signal after being pressed and transmits the electric signal to the driving circuit 4. The material of the piezoelectric structure layer is, for example, aluminum nitride (AlN), lithium gallate, lithium germanate, titanium germanate, lithium tantalate, or the like, and in the present embodiment, aluminum nitride is selected. In other embodiments, the triggering module 3 may also be a temperature sensor, and when a user presses the display panel, the temperature of the surface of the display panel generally increases, so that an electrical signal can be generated by the temperature sensor. However, it should be noted that in this embodiment, the interference of the ambient temperature needs to be eliminated, i.e. when the ambient temperature is high, it is not suitable to perform fingerprint recognition in this way.
Optionally, after the triggering module 3 is triggered, the driving circuit 4 determines a pressed area according to the first electrical signal, and controls the photosensitive module 5 located in the pressed area to perform fingerprint scanning on the pressed area, so as to obtain fingerprint information of the user. In this way, full-screen scanning is not required (i.e., all the light sensing modules 5 are not required to be started), thereby reducing the power consumption of the display panel.
The drive circuit 4 may be shared with or integrated with circuitry for driving the pixel display to facilitate cost reduction.
The photosensitive module 5 comprises a PIN silicon photodiode, the PIN silicon photodiode comprises an N-type layer 51, an I-type layer 52 and a P-type layer 53 which are sequentially arranged upwards, and the thickness of the I-type layer 52 is larger than that of the N-type layer and that of the P-type layer. The PIN silicon photodiode has good optical sensitivity and high response speed, and is favorable for improving the response speed and the sensitivity. Under the condition that the area of the pixel allows, the larger the area of the PIN silicon photodiode is, the higher the sensitivity of sensing the change of the external light is. In other embodiments, the photosensitive module 5 may be another photoelectric conversion element.
The photosensitive module 5 is further configured to generate a second electrical signal according to the change of the ambient light, and transmit the second electrical signal to the driving circuit 4, and the driving circuit 4 determines a touch position according to the second electrical signal and executes a touch instruction by a processor of a display screen or a display device including the display panel. Specifically, ambient light incident to the light sensing module 5 is reduced due to Touch operation of a user, so that leakage current changes, the driving circuit 4 calculates the position of a Touch point according to the leakage current, and finally embedded Touch (In-Cell Touch) is realized, that is, the display panel (or the display screen including the display panel) has fingerprint identification, Touch and display functions.
Specifically, when the incident light energy E — hv exceeds the forbidden band width of the silicon material, electron-hole pairs are generated in the depletion region (I-type layer) or in the length from the edge of the depletion region, and such electron-hole pairs are pulled by an applied electric field, electrons drift toward the N-type layer 51, holes drift toward the P-type layer 53, and when carriers move through the depletion region, a photocurrent is generated in an external circuit. The thickness of the depletion region layer, i.e., the I-type layer 52, can be selected for the PIN silicon photodiode to further increase sensitivity and response speed, while the I-type layer 52 is thicker to better absorb optical radiation to produce photocurrent. When touch control operation is carried out, the ambient light changes due to finger touch, the concentration of photo-generated carriers is reduced or increased to cause leakage current change, the touch position is judged according to the leakage current change, and the embedded touch control function is realized.
In this embodiment, the driving circuit 4 includes a thin film transistor 2, and the triggering module 3 and the photosensitive module 5 are formed on the thin film transistor 2. In other embodiments, the triggering module 3 and the photosensitive module 5 may also be formed on other film layers, and correspondingly, some via hole designs need to be made to electrically connect the triggering module 3 and the photosensitive module 5 with the thin film transistor 2. Of course, the display panel further includes a liquid crystal layer, which is not shown in the drawing. In other embodiments, the display panel may also be an OLED display panel that does not include a liquid crystal layer.
Referring to fig. 2 and fig. 3, the display panel includes a plurality of first gate lines 21 extending along a transverse direction X, a plurality of second gate lines 22 (Dual gate structure), and a plurality of first data lines 23 and a plurality of second data lines 24 extending along a longitudinal direction Y. The first gate line 21 is electrically connected to the P-type layer 53, the first data line 23 is electrically connected to the driving circuit 4 and the N-type layer 51, and the first data line 23 is electrically connected to the driving circuit 4 and the triggering module 3, that is, the first data line 23 is used as a reading line for a first electrical signal and a reading line for a second electrical signal. The display panel further includes an electrode layer 6 formed on the P-type layer 53, and the P-type layer 53 is electrically connected to the first gate line 21 through the electrode layer 6 and a via hole (not shown). Because the grid electrode is in a closed state most of the time, the PIN silicon photodiode is in a back-pressure state most of the time, the leakage current is more sensitive to light, the current change is obvious, and the fingerprint scanning precision is improved. The second gate lines 22 and the second data lines 24 are used as gate lines and data lines of a conventional display panel, which will not be described in detail in this embodiment.
With continued reference to fig. 2, the display panel has a plurality of pixels a11, and the projection of the first data line 23 on the substrate 1 is located between the projections of two laterally adjacent pixels a11 on the substrate 1, in other words, the first data line 23 does not occupy the pixel space, and therefore, the aperture ratio is not affected, and the display effect of the display screen or the display device is not affected. In practice, the projection of the second data line 24 on the substrate 1 is located within the projection of the first data line 23 on the substrate 1.
Referring to fig. 2 and 4, the display panel has a plurality of pixel areas a1, each pixel area a1 is used as a touch block and includes a plurality of pixels a11, and each photosensitive module 5 corresponds to a pixel area a 1. That is, a plurality of pixels a11 can share one photosensitive module 5 to realize touch control without designing a photosensitive module for each pixel, thereby reducing cost. However, it is only necessary to ensure that the leakage current can reach the range of touch sensing, and enough pixels are designed in the corresponding pixel regions and the corresponding first signal lines 23 are connected together.
Referring to fig. 1, the display panel further includes a supporting pillar 7 formed on the piezoelectric structure layer and a substrate 9 disposed on the supporting pillar 7, where at least a portion of the supporting pillar 7 is overlapped with an orthographic projection of the piezoelectric structure layer on the substrate 1, and the supporting pillar 7 is used to transmit a stress of the substrate 9 to the piezoelectric structure layer. Alternatively, the substrate is, for example, a CF (color filter) substrate. The supporting columns 7 are used for transmitting stress to the piezoelectric structure layer while supporting the substrate 9.
The following describes a manufacturing process of the display panel, and the manufacturing method of the display panel includes:
step S11: forming a thin film transistor on a substrate by using a photomask process;
step S12: using a photomask process, a trigger module 3, such as a piezoelectric structure layer, is formed on the thin film transistor, and the piezoelectric structure layer is located above the source of the thin film transistor.
Step S13: the photosensitive module 5 is formed on the thin film transistor by using a photomask process, for example, a PIN silicon photodiode located above a drain of the thin film transistor.
Step S14: a passivation layer (not shown) is formed on the trigger block 3 and the photosensitive block 5 by using a photomask process.
Step S15: by using the photomask process, the electrode layer 6 is formed, and the electrode layer 6 is electrically connected to the P-type layer 53 of the photo sensor module 5 and electrically connected to the first gate line 21 through the via hole, so that the P-type layer 53 of the photo sensor module 5 is electrically connected to the first gate line 21.
Further, step S13 includes:
step S131: a metal electrode is formed in contact with the N-type layer, and is in contact with the N-type layer 51 of the PIN photodiode.
Step S132: depositing a-Si by PECVD (Plasma Enhanced Chemical Vapor Deposition), doping PH3 gas into the N-type layer 51 gas source, and doping P into the N-type layer to realize the N-type layer; the gas source of the P-type layer 53 is doped with B2H6 gas, and B is doped to realize the P-type layer; the I-type layer (intrinsic semiconductor, depletion layer) is not doped at all, the thickness of the I-type layer is adjustable, and the thicker the I-type layer is, the more sensitive the I-type layer is to leakage current induction.
Step S133: and etching the P-type layer, the I-type layer and the N-type layer of other regions by using the PIN Mask, and only reserving a useful PIN part to form the PIN silicon photodiode.
On the other hand, the invention also provides a display screen. In this embodiment, the display screen includes a backlight module and the display panel of any one of the foregoing embodiments, where the backlight module is configured to provide backlight for the display panel, so as to implement a display function of the display screen. Because the display screen comprises the display panel, the functions of fingerprint identification, touch control and display can be realized. And when the display screen is an OLED display screen, the display screen does not comprise a backlight module.
In another aspect, the present invention further provides a display device, which includes the display screen. The display device is, for example, an electronic device having a display screen, such as a mobile phone, a tablet computer, a notebook computer, a television, and a monitor. Because the display device comprises the display panel, the functions of fingerprint identification, touch control and display can be realized.
In addition, the invention also provides a fingerprint unlocking method which is used for the display equipment. Referring to fig. 5, the fingerprint unlocking method includes:
step S21: the pressing operation of a user is converted into an electric signal through the piezoelectric structure layer.
Step S22: determining a pressed area according to the electric signal;
step S23: collecting fingerprint information of a pressed area;
step S24: judging whether the acquired fingerprint information is matched with preset fingerprint information or not;
step S25: if the acquired fingerprint information is matched with preset fingerprint information, unlocking the display screen; and if the acquired fingerprint information is not matched with the preset fingerprint information, the unlocking operation is not executed. If the collected fingerprint information is not matched with the preset fingerprint information for many times, the screen can be locked, and the fingerprint identification function is forbidden to be used within a certain time.
Step S21 is executed by the piezoelectric structure layer, step S22 is executed by the driving circuit 4, step S23 is executed by the photosensitive module 5, and steps S24 and S25 are executed by the display screen, a fingerprint chip built in the display device, or a processor.
The invention further provides a touch method for the display device. Referring to fig. 6, the touch method includes:
step S31: and converting the ambient light change caused by touch operation into an electric signal.
Step S32: and determining the touch position according to the electric signal.
Step S33: and responding to touch operation based on the touch position.
Step S31 is executed by the photosensitive module 5, step S32 is executed by the driving circuit 4, and step S33 is executed by a display screen, a processor built in the display device.
In the invention, the triggering action of the user during unlocking is sensed through the triggering module to generate an electric signal, and the driving circuit controls the photosensitive module to scan the fingerprint after receiving the electric signal, so that the fingerprint information of the user is obtained, and full-screen fingerprint identification is realized. Meanwhile, the photosensitive module can be used for touch control, so that the display panel can realize fingerprint identification, touch control and display functions.
Although the present invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (14)
1. A display panel is characterized by comprising a substrate, a driving circuit and a plurality of fingerprint identification units, wherein the driving circuit and the fingerprint identification units are positioned above the substrate;
the triggering module generates a first electric signal after being triggered and transmits the first electric signal to the driving circuit, and the driving circuit controls the photosensitive module to scan fingerprints according to the first electric signal so as to acquire fingerprint information.
2. The display panel according to claim 1, wherein after the triggering module is triggered, the driving circuit determines a pressed area according to the first electrical signal, and controls a photosensitive module corresponding to the pressed area to perform fingerprint scanning on the pressed area to obtain fingerprint information.
3. The display panel according to claim 1, wherein the light sensing module is configured to generate a second electrical signal according to the change of the ambient light and transmit the second electrical signal to the driving circuit, and the driving circuit determines the touch position according to the second electrical signal.
4. The display panel of claim 1, wherein the triggering module comprises a piezoelectric structure layer, and the piezoelectric structure layer generates an electrical signal after being pressed.
5. The display panel according to claim 4, wherein the display panel comprises a supporting pillar formed on the piezoelectric structure layer and a substrate formed on the supporting pillar, the supporting pillar is at least partially overlapped with an orthographic projection of the piezoelectric structure layer on the substrate, and the supporting pillar is used for transmitting stress of the substrate to the piezoelectric structure layer.
6. The display panel according to any one of claims 1 to 5, wherein the driving circuit includes a plurality of thin film transistors formed over the substrate, and wherein the triggering block and the light sensing block are formed over the thin film transistors.
7. The display panel according to claim 6, wherein the display panel comprises a plurality of first data lines extending along a longitudinal direction, the first data lines electrically connect the triggering module and the driving circuit, and the first data lines electrically connect the light sensing module and the driving circuit.
8. The display panel according to claim 7, wherein the photosensitive module comprises a PIN silicon photodiode, the PIN silicon photodiode comprises an N-type layer, an I-type layer and a P-type layer which are stacked, and the thickness of the I-type layer is greater than that of the N-type layer and that of the P-type layer.
9. The display panel according to claim 8, wherein the display panel comprises a plurality of first gate lines extending in a transverse direction, the first gate lines are electrically connected to the P-type layer, and the first data lines are electrically connected to the driving circuit and the N-type layer.
10. The display panel according to claim 7, wherein the display panel has a plurality of pixels, and a projection of the first data line on the substrate is located between projections of two laterally adjacent pixels on the substrate.
11. The display panel of claim 7, wherein the display panel has a plurality of pixel regions, each pixel region comprises a plurality of pixels, and each of the photosensitive modules corresponds to one of the pixel regions.
12. A display device characterized in that the display device comprises the display panel according to any one of claims 1 to 11.
13. A fingerprint unlocking method for the display device according to claim 12, wherein the fingerprint unlocking method comprises:
converting the pressing operation of the user into a first electric signal;
determining a compressed area according to the first electric signal;
collecting fingerprint information of a pressed area;
judging whether the acquired fingerprint information is matched with preset fingerprint information or not;
and if the collected fingerprint information is matched with the preset fingerprint information, unlocking the display panel.
14. A touch method for the display device according to claim 12, wherein the touch method comprises:
converting the ambient light change caused by touch operation into a second electric signal;
determining a touch position according to the second electric signal;
and responding to touch operation based on the touch position.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113158742A (en) * | 2021-01-29 | 2021-07-23 | 合肥维信诺科技有限公司 | Fingerprint identification circuit, driving method thereof and fingerprint identification equipment |
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| CN113158742B (en) * | 2021-01-29 | 2024-02-02 | 合肥维信诺科技有限公司 | Fingerprint identification circuit, driving method thereof and fingerprint identification equipment |
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