CN111241882B - Fingerprint identification device, equipment and method - Google Patents
Fingerprint identification device, equipment and method Download PDFInfo
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- CN111241882B CN111241882B CN201811444740.9A CN201811444740A CN111241882B CN 111241882 B CN111241882 B CN 111241882B CN 201811444740 A CN201811444740 A CN 201811444740A CN 111241882 B CN111241882 B CN 111241882B
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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
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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Abstract
The application discloses a fingerprint identification device, equipment and a method, and relates to the field of fingerprint identification. The method comprises the following steps: the OLED receives the touch starting event and reports the touch starting event to the processing unit; the processing unit sends a first control instruction to the liquid crystal layer according to the touch starting event; the liquid crystal layer is switched from a shading state to a light guide state according to a first control instruction; the fingerprint sensor collects reflected light rays transmitted through the liquid crystal layer and performs fingerprint identification. According to the technical scheme, the liquid crystal layer is added between the OLED and the fingerprint sensor, the physical property of the liquid crystal layer is applied, the arrangement of liquid crystal molecules is irregular in the geomagnetic field, light cannot pass through the liquid crystal layer, the effect of shielding the edge of an opening is achieved, and the problem that a user can see the structure under the screen at the position of the edge of the opening when observing the front of the OLED is solved; in a certain strength of the oriented magnetic field, liquid crystal molecules can be regularly arranged in a specified direction, so that light can be transmitted, and fingerprint identification is not affected.
Description
Technical Field
The embodiment of the application relates to the field of fingerprint identification, in particular to a fingerprint identification device, equipment and a method.
Background
The mobile terminal can perform identity recognition of sensitive verification scenes such as screen unlocking, payment verification and the like through fingerprint recognition.
In the related art, a mobile terminal is provided with a fingerprint recognition component in an area outside a display screen to perform fingerprint recognition. Typically, the mobile terminal includes an OLED (Organic Light Emitting Display, an organic light emitting display), a light shielding layer and a fingerprint sensor, where the light shielding layer is adhered to the back surface of the OLED, the light shielding layer is used to avoid the influence of a lower device on the back surface of the OLED on the interface display of the OLED, and since the fingerprint sensor needs to collect light, the light shielding layer needs to be perforated to adhere the fingerprint sensor to the back surface of the OLED.
However, the area of the opening is larger than the area of the fingerprint sensor adhered to the OLED, so that a problem that a user can see the structure under the screen at the edge of the opening when looking at the front of the OLED is caused, thereby affecting the display of the user interface on the OLED.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification device, equipment and a method, which can solve the problem that a user can see an under-screen structure at the position of the edge of an opening when observing the front of an OLED. The technical scheme is as follows:
according to a first aspect of the present application, there is provided a fingerprint identification device, the device comprising: an organic light emitting display OLED, a liquid crystal layer, and a fingerprint sensor;
the back of the OLED is attached to one side of the liquid crystal layer;
the other side of the liquid crystal layer is attached to the fingerprint sensor.
In some embodiments, the apparatus further comprises: a processing unit;
the processing unit is respectively and electrically connected with the OLED, the liquid crystal layer and the fingerprint sensor; the processing unit is used for controlling the liquid crystal layer to switch between a shading state and a light guiding state;
the light shielding state is a state that liquid crystal molecules in the liquid crystal layer are at a first torsion angle and shield light rays towards the fingerprint sensor; the light guiding state is a state that liquid crystal molecules in the liquid crystal layer are at a second torsion angle to conduct light rays towards the fingerprint sensor.
In some embodiments of the present invention, in some embodiments,
the OLED is used for receiving the touch starting event and reporting the touch starting event to the processing unit;
the processing unit is used for sending a first control instruction to the liquid crystal layer according to the touch starting event;
the liquid crystal layer is used for switching from a shading state to a light guide state according to a first control instruction;
the fingerprint sensor is used for collecting reflected light rays transmitted through the liquid crystal layer and carrying out fingerprint identification.
In some embodiments, a highlight region is included on the OLED, the highlight region being a region corresponding to the fingerprint sensor;
the liquid crystal layer is also used for controlling the liquid crystal area corresponding to the highlight area to switch from the shading state to the light guiding state according to the first control instruction.
In some embodiments, a highlight region is included on the OLED, the highlight region being a region corresponding to the fingerprint sensor;
the processing unit is also used for sending a second control instruction to the OLED according to the touch starting event;
the OLED is also used for controlling the highlight region to be in a highlight light-emitting state according to the second control instruction.
In some embodiments of the present invention, in some embodiments,
the OLED is used for receiving the touch ending event and reporting the touch ending event to the processing unit;
the processing unit is used for sending a third control instruction to the liquid crystal layer according to the touch end event;
and the liquid crystal layer is used for switching from the light guide state to the shading state according to the third control instruction.
In some embodiments, a highlight region is included on the OLED, the highlight region being a region corresponding to the fingerprint sensor;
and the liquid crystal layer is also used for controlling the liquid crystal area corresponding to the highlight area to switch from the light guide state to the shading state according to the third control instruction.
In some embodiments, a highlight region is included on the OLED, the highlight region being a region corresponding to the fingerprint sensor;
the processing unit is also used for sending a fourth control instruction to the OLED according to the touch end event;
the OLED is also used for controlling the highlight area to be in a normal light-emitting state according to a fourth control instruction.
According to a second aspect of the present application there is provided a mobile terminal comprising a fingerprint recognition device as described in any of the first aspects.
According to a third aspect of the present application, there is provided a fingerprint identification method applied to a fingerprint identification device as described in any one of the first aspects, the method comprising:
the OLED receives the touch starting event and reports the touch starting event to the processing unit;
the processing unit sends a first control instruction to the liquid crystal layer according to the touch starting event;
the liquid crystal layer is switched from a shading state to a light guide state according to a first control instruction; the light shielding state is a state that liquid crystal molecules in the liquid crystal layer are at a first torsion angle and shield light rays towards the fingerprint sensor; the light guide state is a state that liquid crystal molecules in the liquid crystal layer are in a second torsion angle to conduct light rays towards the fingerprint sensor;
the fingerprint sensor collects reflected light rays transmitted through the liquid crystal layer and performs fingerprint identification.
In some embodiments, a highlight region is included on the OLED, the highlight region being a region corresponding to the fingerprint sensor;
the liquid crystal layer receives a touch start event according to a first control instruction OLED, and after reporting the touch start event to the processing unit, the liquid crystal layer comprises:
the liquid crystal layer controls the liquid crystal area corresponding to the highlight area to switch from the shading state to the light guiding state according to the first control instruction.
In some embodiments, a highlight region is included on the OLED, the highlight region being a region corresponding to the fingerprint sensor;
after receiving the touch start event and reporting the touch start event to the processing unit, the OLED comprises:
the processing unit sends a second control instruction to the OLED according to the touch starting event;
the OLED controls the highlight region to be in a highlight light-emitting state according to the second control instruction.
In some embodiments, the fingerprint sensor collects the reflected light transmitted through the liquid crystal layer, and after fingerprint identification, the fingerprint sensor includes:
the OLED receives the touch ending event and reports the touch ending event to the processing unit;
the processing unit sends a third control instruction to the liquid crystal layer according to the touch end event;
the liquid crystal layer is switched from the light guide state to the shading state according to a third control instruction.
In some embodiments, a highlight region is included on the OLED, the highlight region being a region corresponding to the fingerprint sensor;
the liquid crystal layer is switched from the light guide state to the shading state according to a third control instruction, and the liquid crystal layer comprises:
the liquid crystal layer controls the liquid crystal area corresponding to the highlight area to switch from the light guide state to the shading state according to the third control instruction.
In some embodiments, a highlight region is included on the OLED, the highlight region being a region corresponding to the fingerprint sensor;
the OLED receives the touch ending event, and after reporting the touch ending event to the processing unit, the OLED comprises the following steps:
the processing unit sends a fourth control instruction to the OLED according to the touch end event;
the OLED controls the highlight region to be in a normal light-emitting state according to the fourth control instruction.
The beneficial effects that technical scheme that this application embodiment provided include at least:
by adding a liquid crystal layer for shading between the OLED and the fingerprint sensor, physical properties of the liquid crystal layer are applied, liquid crystal molecules can be regularly arranged in a specified direction in a directional magnetic field with certain strength, light can be transmitted, and in the fingerprint identification process, the processing unit controls the liquid crystal layer to be in a light guide state, so that the fingerprint identification is not affected; in the geomagnetic field, the liquid crystal molecules are arranged irregularly, light cannot pass through, the liquid crystal layer is in a shading state in a non-fingerprint identification process, the effect of shading the edges of the holes is achieved, the problem that a user can see the structure under the screen at the positions of the edges of the holes when observing the front of the OLED is solved, and the display of a user interface on the OLED is not affected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an electronic device provided in an exemplary embodiment of the present application;
FIG. 2 is a block diagram of an electronic device provided in another exemplary embodiment of the present application;
FIG. 3 is a block diagram of an electronic device provided in another exemplary embodiment of the present application;
FIG. 4 is a flowchart of a fingerprint identification method provided in an exemplary embodiment of the present application;
FIG. 5 is a flowchart of a fingerprint identification method provided in another exemplary embodiment of the present application;
FIG. 6 is a flowchart of a fingerprint identification method provided in another exemplary embodiment of the present application;
FIG. 7 is a flowchart of a fingerprint identification method provided in another exemplary embodiment of the present application;
fig. 8 is a block diagram of a fingerprint recognition device provided in another exemplary embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
First, several terms related to the embodiments of the present application are explained:
an OLED is a display. Unlike conventional LCD (Liquid Crystal Display ) display, OLED displays employ a very thin coating of organic material and a glass substrate, which emits light when a current is passed through them, and no backlight is needed.
The touch start event is triggered by a touch operation on the touch display screen. In the present application, a touch start event is triggered by a user touching a screen area of a corresponding fingerprint sensor.
The touch end event is triggered when the touch operation on the touch display screen disappears. In the present application, a touch end event is triggered when a user ends a touch on a screen area of a corresponding fingerprint sensor.
The normal light emitting state refers to a light emitting state of the OLED when the user interface is displayed.
The high luminance light emitting state refers to a light emitting state in which the luminance value is high when the OLED emits light.
Fig. 1 is a schematic structural diagram of a fingerprint recognition device according to an exemplary embodiment of the present application. The device comprises: an OLED101, a liquid crystal layer 102 and a fingerprint sensor 103.
As shown in fig. 1, the direction indicated by the arrow is the viewing direction of the user observing the screen, one side of the OLED101 opposite to the viewing direction is the front surface of the OLED101, and the other side is the back surface of the OLED 101; the back of the OLED101 is attached to one side of the liquid crystal layer 102; the other side of the liquid crystal layer 102 is bonded to the fingerprint sensor 103.
In one implementation of the present application, the apparatus further includes a processing unit 104, as shown in fig. 2. The processing unit 104 is electrically connected with the OLED101, the liquid crystal layer 102 and the fingerprint sensor 103 respectively; the processing unit 104 is used for controlling the switching of the liquid crystal layer between the light shielding state and the light guiding state. The OLED101 is configured to receive a touch start event and report the touch start event to the processing unit 104; the processing unit 104 is configured to send a first control instruction to the liquid crystal layer 102 according to a touch start event; the liquid crystal layer 102 is used for switching from a shading state to a light guiding state according to a first control instruction; the fingerprint sensor 103 is used for collecting reflected light transmitted through the liquid crystal layer and performing fingerprint identification.
The light shielding state is a state that liquid crystal molecules in the liquid crystal layer are at a first torsion angle and shield light rays towards the fingerprint sensor; the light guiding state is a state that liquid crystal molecules in the liquid crystal layer are at a second torsion angle to conduct light rays towards the fingerprint sensor.
Illustratively, the user triggers a touch start event on the OLED101 of the device, the device receives the touch start event on the OLED101 and reports the touch start event to the processing unit 104; after receiving the touch start event, the processing unit 104 generates a first control instruction according to the touch start event, and sends the first control instruction to the liquid crystal layer 102; the liquid crystal layer 102 receives a first control instruction and switches from a shading state to a light guiding state; the light propagates to the surface layer of the finger and is reflected, the reflected light propagates to the fingerprint sensor 103 through the liquid crystal layer 102 in the light guiding state, the fingerprint sensor 103 collects the reflected light, and the fingerprint of the finger is obtained through the recognition of the reflected light. Alternatively, the light may be the light emitted by the OLED101, or the light emitted by the fingerprint sensor 103.
It should be noted that, in some embodiments, based on the device shown in fig. 2, when the OLED101 is viewed from the front side, the OLED101 includes a highlight region 11, as shown in fig. 3, where the highlight region 11 corresponds to the fingerprint sensor 103, and the liquid crystal layer 102, the fingerprint sensor 103, and the processing unit 104 are disposed on the back side (not shown in fig. 3) of the OLED 101.
In some embodiments, based on the device shown in fig. 3, the liquid crystal layer 102 is further configured to control the liquid crystal region corresponding to the highlight region 11 to switch from the light shielding state to the light guiding state according to the first control instruction.
Illustratively, when the device receives a touch start event triggered by a user on the highlight region 11 of the OLED101, the processing unit 104 that receives the touch start event reported by the OLED101 generates a first control instruction, and sends the first control instruction to the liquid crystal layer 102; the liquid crystal layer 102 controls the liquid crystal region corresponding to the highlight region 11 to switch from the light shielding state to the light guiding state according to the first control instruction; the light propagates to the surface layer of the finger and is reflected, the reflected light propagates to the fingerprint sensor 103 through the liquid crystal layer 102 in the light guiding state, the fingerprint sensor 103 collects the reflected light, and the fingerprint of the finger is obtained through the recognition of the reflected light.
In some embodiments, based on the apparatus shown in fig. 3, the processing unit 103 is further configured to send a second control instruction to the OLED101 according to a trigger start event; the OLED101 is further configured to control the highlight region 11 to be in a highlight light emitting state according to the second control instruction.
Illustratively, when the device receives a touch start event triggered by a user on the highlight region 11 of the OLED101, the processing unit 104 that receives the touch start event reported by the OLED101 generates a second control instruction, and feeds back the second control instruction to the OLED 101; the OLED101 brings the highlight region 11 into a highlight light emitting state according to the second control instruction.
In some embodiments, based on the apparatus shown in fig. 2, the OLED101 is further configured to receive a touch end event and report the touch end event to the processing unit 104; the processing unit 101 is further configured to send a third control instruction to the liquid crystal layer 102 according to the touch end event; the liquid crystal layer 102 is further configured to switch from the light guiding state to the light shielding state according to a third control instruction.
Illustratively, when the user's finger leaves the OLED101, a touch end event is triggered on the OLED101 and reported to the processing unit 104; the processing unit 104 generates a third control instruction according to the touch end event, and controls the liquid crystal layer 102 to switch from the light guiding state to the light shielding state through the third control instruction.
In some embodiments, based on the device shown in fig. 3, the liquid crystal layer 102 is further configured to control, according to the third control instruction, switching from the light guiding state to the light shielding state in the liquid crystal region corresponding to the highlight region 11.
Illustratively, when the user's finger leaves the highlighted area 11 of the OLED101, a touch end event is triggered on the OLED101 and reported to the processing unit 104; the processing unit 104 generates a third control instruction according to the touch end event, and controls the liquid crystal region corresponding to the highlight region 11 on the liquid crystal layer 102 to switch from the light guiding state to the light shielding state through the third control instruction.
In some embodiments, based on the apparatus shown in fig. 3, the processing unit 104 is further configured to send a fourth control instruction to the OLED101 according to a touch end event; the OLED101 is further configured to control the highlight region to be in a normal light emitting state according to a fourth control instruction.
Illustratively, when the user's finger leaves the highlighted area 11 of the OLED101, a touch end event is triggered on the OLED101 and reported to the processing unit 104; the processing unit 104 generates a fourth control instruction according to the touch end event, and controls the highlight region 11 to be in a normal light emitting state by the fourth control instruction.
The fingerprint recognition device shown in fig. 1 is a part of a mobile terminal, and the devices shown in fig. 2 and 3 may be a part or all of the mobile terminal.
Fig. 4 is a flowchart of a fingerprint identification method according to an exemplary embodiment of the present application, where the method is applied to the apparatus shown in fig. 2 for illustration, and the method includes:
in step 201, the oled receives a touch start event and reports the touch start event to the processing unit.
Alternatively, the OLED employs one of a vector pressure sensing technology, a resistive technology, a capacitive technology, an infrared technology, and a surface acoustic wave technology.
The OLED is exemplified by adopting a capacitance technology, a user touches the screen to form a coupling capacitance with the surface of the OLED, and at the moment, the coupling capacitance is equivalent to connecting a capacitance into a detection circuit of the OLED, so that the current in the detection circuit is changed; the detection circuit detects the change of the current and forms a touch starting event according to the change of the current; the OLED reports the touch start event to the processing unit.
In step 202, the processing unit sends a first control instruction to the liquid crystal layer according to the touch start event.
The first control command is a command for controlling the liquid crystal layer to switch from the light shielding layer to the light guiding layer.
Optionally, the processing unit comprises a control circuit of the liquid crystal layer. The processing unit receives a touch starting event reported by the OLED and generates a first control instruction, wherein the first control instruction is an instruction for indicating a control circuit of the liquid crystal layer to control the liquid crystal layer to switch from a shading state to a light guiding state; the processing unit sends a first control instruction to a control circuit of the liquid crystal layer.
In step 203, the liquid crystal layer is switched from the light shielding state to the light guiding state according to the first control command.
Optionally, the control circuit of the liquid crystal layer controls the liquid crystal layer to switch from the light shielding state to the light guiding state, that is, the control circuit of the liquid crystal layer adds an electromagnetic field in the liquid crystal layer, and liquid crystal molecules in the liquid crystal layer are orderly arranged according to the specified direction of the electromagnetic field, so that the liquid crystal layer can guide light.
In step 204, the fingerprint sensor collects the reflected light transmitted through the liquid crystal layer to perform fingerprint identification.
Optionally, the OLED is in a light emitting state, light propagates to the surface layer of the finger to be reflected, and when the liquid crystal layer is in a light guiding state, the emitted light can propagate to the fingerprint sensor through the liquid crystal layer; the fingerprint sensor collects reflected light, and the fingerprint of the finger is obtained through the recognition of the reflected light. Alternatively, the light may be light emitted by the OLED or light emitted by the fingerprint sensor.
In summary, according to the fingerprint identification method provided by the embodiment, the liquid crystal layer is added between the OLED and the fingerprint sensor, and the physical property of the liquid crystal layer is applied, so that the liquid crystal molecules are arranged irregularly in the geomagnetic field, and the light cannot pass, thereby achieving the purpose of shielding the edge of the opening; in an oriented magnetic field with certain strength, liquid crystal molecules can be regularly arranged in a specified direction, so that light can be transmitted, and a fingerprint sensor can collect reflected light to perform fingerprint identification; the problem that a user can see the structure under the screen at the edge of the opening when observing the front surface of the OLED is solved, the display of the user interface on the OLED is not affected, and meanwhile fingerprint identification is not affected.
Fig. 5 is a flowchart of a fingerprint identification method according to another embodiment of the present application, and the method is applied to the apparatus shown in fig. 3 for example, and it should be noted that, based on fig. 2, step 203 is replaced by step 2031, and the method for controlling the physical state of the local area of the liquid crystal layer in this embodiment is described as follows:
in step 2031, the liquid crystal layer controls the liquid crystal region corresponding to the highlight region to switch from the light shielding state to the light guiding state according to the first control instruction.
Optionally, the OLED includes a highlight region, which is a region corresponding to the fingerprint sensor. The control circuit of the liquid crystal layer also controls the liquid crystal region corresponding to the highlight region to switch from the shading state to the light guiding state, namely, the control circuit of the liquid crystal layer adds an electromagnetic field to the liquid crystal region corresponding to the highlight region, and liquid crystal molecules of the liquid crystal region corresponding to the highlight region are orderly arranged according to the appointed direction of the electromagnetic field, so that the liquid crystal region guides light.
In summary, according to the fingerprint identification method provided by the embodiment, the liquid crystal layer is added between the OLED and the fingerprint sensor, and the physical property of the liquid crystal layer is applied, so that the liquid crystal molecules are arranged irregularly in the geomagnetic field, and the light cannot pass, thereby achieving the purpose of shielding the edge of the opening; in an oriented magnetic field with certain strength, liquid crystal molecules can be regularly arranged in a specified direction, so that light can be transmitted, and a fingerprint sensor can collect reflected light to perform fingerprint identification; the problem that a user can see the structure under the screen at the edge of the opening when observing the front surface of the OLED is solved, the display of the user interface on the OLED is not affected, and meanwhile fingerprint identification is not affected.
In addition, in the fingerprint identification method in this embodiment, only the liquid crystal region corresponding to the highlight region is controlled to switch from the light shielding state to the light guiding state, and the region of the liquid crystal layer to be controlled is small and the power consumption is also small.
Fig. 6 is a flowchart of a fingerprint recognition method according to another embodiment of the present application, and the method is applied to the apparatus shown in fig. 3 for example, it should be noted that, based on fig. 5, steps 301 to 302 are added after step 201, and a highlight area is included on the oled, where the highlight area emits light to provide a light source required in the fingerprint recognition process, and the steps are as follows:
in step 301, the processing unit sends a second control instruction to the OLED according to the touch start event.
The second control instruction is an instruction to control the highlight region of the OLED to be in a highlight light emitting state.
Optionally, the OLED is in a black screen state, or the OLED is in a light emitting state, the processing unit receives a touch start event reported by the OLED, and generates a second control instruction, where the second control instruction is an instruction for controlling the display driving circuit of the OLED to enter a highlight light emitting state in a highlight region; the processing unit sends a second control instruction to the display driving circuit of the OLED.
In step 302, the oled controls the highlight region to be in a highlight state according to the second control instruction.
Optionally, the display driving circuit of the OLED receives the second control instruction, and a corresponding electrical signal is given to the highlight region of the OLED, so that the highlight region is in a highlight light-emitting state.
It should be noted that, steps 301 to 302 are performed after step 201 and before step 204, and the timing between steps 301 to 302 and steps 202 to 2031 is not limited in this application; illustratively, steps 301 through 302 are parallel to steps 202 through 2031 in this embodiment.
In summary, according to the fingerprint identification method provided by the embodiment, the liquid crystal layer is added between the OLED and the fingerprint sensor, and the physical property of the liquid crystal layer is applied, so that the liquid crystal molecules are arranged irregularly in the geomagnetic field, and the light cannot pass, thereby achieving the purpose of shielding the edge of the opening; in an oriented magnetic field with certain strength, liquid crystal molecules can be regularly arranged in a specified direction, so that light can be transmitted, and a fingerprint sensor can collect reflected light to perform fingerprint identification; the problem that a user can see the structure under the screen at the edge of the opening when observing the front surface of the OLED is solved, the display of the user interface on the OLED is not affected, and meanwhile fingerprint identification is not affected.
According to the fingerprint identification method, more sufficient light sources are provided through the highlight areas of the OLED, so that the energy of emitted light is higher, and the fingerprint identification efficiency of the fingerprint sensor is improved.
Fig. 7 is a flowchart of a fingerprint identification method according to another embodiment of the present application, where the method is applied to the apparatus shown in fig. 3 for illustration, and the method includes:
in step 401, the oled receives a touch start event and reports the touch start event to the processing unit.
The OLED is in a black screen state or in a light emitting state, receives a touch start event triggered by a user on a screen, and reports the touch start event to the processing unit.
In step 402, the processing unit sends a first control instruction to the liquid crystal layer according to the touch start event.
The processing unit receives a touch start event, and generates a first control instruction according to the touch start event, wherein the first control instruction is an instruction for controlling the liquid crystal layer to switch from a shading state to a light guide state; then, the processing unit sends the first control instruction to the liquid crystal layer.
In step 403, the liquid crystal layer is switched from the light shielding state to the light guiding state according to the first control command.
The liquid crystal layer receives a first control instruction sent by the processing unit and controls the liquid crystal layer to switch from a shading state to a light guiding state.
Optionally, the OLED includes a highlight region, where the highlight region is a region corresponding to the fingerprint sensor; the liquid crystal layer controls the liquid crystal area corresponding to the highlight area to switch from the shading state to the light guiding state according to the first control instruction.
In step 404, the fingerprint sensor collects the reflected light transmitted through the liquid crystal layer, and performs fingerprint identification.
When the OLED is in a light emitting state, light emitted by the OLED is reflected by fingers and is transmitted to the fingerprint sensor through the liquid crystal layer, and the fingerprint sensor receives the reflected light to conduct fingerprint identification.
Or the touch starting event triggers the fingerprint sensor to emit light, the light is reflected by the finger and is transmitted to the fingerprint sensor through the liquid crystal layer, and the fingerprint sensor receives the reflected light to perform fingerprint identification.
Optionally, after the OLED receives the touch start event and reports the touch start event to the processing unit, the processing unit sends a second control instruction to the OLED according to the touch start event; the OLED controls the highlight region to be in a highlight light-emitting state according to the second control instruction. The second control instruction is used for controlling the highlight area of the OLED to enter a highlight state.
In some embodiments, when the OLED is in a light emitting state, a finger touches a highlighted area of the OLED, generating a touch start event on the OLED; the processing unit generates a second control instruction according to the touch start event reported by the OLED and sends the second control instruction to the OLED; after the OLED receives the second control instruction, the highlight region of the OLED is controlled to be switched from a normal light-emitting state to a highlight light-emitting state, light rays emitted by the highlight region are reflected by fingers and are transmitted to the fingerprint sensor through the liquid crystal region corresponding to the highlight region, and the fingerprint sensor receives the reflected light rays to carry out fingerprint identification.
In some embodiments, when the OLED is in a black state, a finger touches a highlighted area of the OLED, generating a touch start event on the OLED; the processing unit generates a second control instruction according to the touch start event reported by the OLED and sends the second control instruction to the OLED; after the OLED receives the second control instruction, the highlight region of the OLED is controlled to directly enter the highlight luminous state from the black screen state, light rays emitted by the highlight region are reflected by fingers and are transmitted to the fingerprint sensor through the liquid crystal region corresponding to the highlight region, and the fingerprint sensor receives the reflected light rays to conduct fingerprint identification.
In step 405, the oled receives the touch end event and reports the touch end event to the processing unit.
When the finger leaves from the OLED, a touch end event is generated, and the OLED reports the touch end event to the processing unit.
In step 406, the processing unit sends a third control instruction to the liquid crystal layer according to the touch end event.
The processing unit receives a touch end event, and generates a third control instruction according to the touch end event, wherein the third control instruction is an instruction for controlling the liquid crystal layer to switch from a light guide state to a shading state; the processing unit sends the third control instruction to the liquid crystal layer.
In step 407, the liquid crystal layer is switched from the light guiding state to the light shielding state according to the third control command.
Optionally, the liquid crystal layer receives the third control instruction; the liquid crystal layer controls the liquid crystal area corresponding to the highlight area to switch from the conduit state to the shading state according to the third control instruction.
In step 408, the processing unit sends a fourth control instruction to the OLED according to the touch end event.
Optionally, when the highlight region of the OLED is in a highlight state, after receiving the contact end event, the processing unit further generates a fourth control instruction according to the contact end event, where the fourth control instruction is used to control the highlight region of the OLED to switch from the highlight state to the normal state; the processing unit sends a fourth control instruction to the OLED.
In step 409, the oled controls the highlight region to be in a normal light emitting state according to the fourth control instruction.
The OLED receives a fourth control instruction, and the drive display circuit of the OLED controls the highlight region of the OLED to be switched from the highlight light-emitting state to the normal light-emitting state.
It should be noted that, the timing between the steps 408 to 409 and 406 to 407 is not limited in this application; in this embodiment, steps 408 to 409 are performed in parallel with steps 406 to 407.
In summary, according to the fingerprint identification method provided by the embodiment, the liquid crystal layer is added between the OLED and the fingerprint sensor, and the physical property of the liquid crystal layer is applied, so that the liquid crystal molecules are arranged irregularly in the geomagnetic field, and the light cannot pass, thereby achieving the purpose of shielding the edge of the opening; in an oriented magnetic field with certain strength, liquid crystal molecules can be regularly arranged in a specified direction, so that light can be transmitted, and a fingerprint sensor can collect reflected light to perform fingerprint identification; the problem that a user can see the structure under the screen at the edge of the opening when observing the front surface of the OLED is solved, the display of the user interface on the OLED is not affected, and meanwhile fingerprint identification is not affected.
In addition, in this embodiment, after fingerprint identification is completed, the highlight region is switched to a normal light-emitting state, and the liquid crystal layer or the liquid crystal region corresponding to the highlight region is switched to a light-shielding state, so that power consumption can be reduced, and meanwhile, the image quality of a picture when a user interface is displayed on the terminal is not affected.
Fig. 8 is a block diagram of a fingerprint recognition device 500 according to an exemplary embodiment of the present application. For example, the apparatus 500 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, or the like.
Referring to fig. 8, apparatus 500 may include one or more of the following components: a processing component 502, a memory 504, a power supply component 506, a multimedia component 508, an audio component 510, an input/output (I/O) interface 512, a sensor component 514, and a communication component 516.
The processing component 502 generally controls overall operation of the apparatus 500, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 502 may include one or more processors 518 to execute instructions to perform all or part of the steps performed by the UE20 in the method embodiments described above. Further, the processing component 502 can include one or more modules that facilitate interactions between the processing component 502 and other components. For example, the processing component 502 can include a multimedia module to facilitate interaction between the multimedia component 508 and the processing component 502.
The memory 504 is configured to store various types of data to support operations at the apparatus 500. Examples of such data include instructions for any application or method operating on the apparatus 500, contact data, phonebook data, messages, pictures, videos, and the like. The memory 504 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power supply component 506 provides power to the various components of the device 500. The power components 506 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 500.
The multimedia component 508 includes a screen between the device 500 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 508 includes a front-facing camera and/or a rear-facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the apparatus 500 is in an operational mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component 510 is configured to output and/or input audio signals. For example, the audio component 510 includes a Microphone (MIC) configured to receive external audio signals when the device 500 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 504 or transmitted via the communication component 516. In some embodiments, the audio component 510 further comprises a speaker for outputting audio signals.
The I/O interface 512 provides an interface between the processing component 502 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly 514 includes one or more sensors for providing status assessment of various aspects of the apparatus 500. For example, the sensor assembly 514 may detect the on/off state of the device 500, the relative positioning of the components, such as the display and keypad of the device 500, the sensor assembly 514 may also detect a change in position of the device 500 or a component of the device 500, the presence or absence of user contact with the device 500, the orientation or acceleration/deceleration of the device 500, and a change in temperature of the device 500. The sensor assembly 514 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 514 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 514 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 516 is configured to facilitate communication between the apparatus 500 and other devices in a wired or wireless manner. The apparatus 500 may access a wireless network based on a communication standard, such as WiFi,2G or 3G, or a combination thereof. In one exemplary embodiment, the communication part 516 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 516 further includes a Near Field Communication (NFC) module to facilitate short range communications.
In an exemplary embodiment, the apparatus 500 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for performing the pattern recognition methods described in the above method embodiments.
In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as memory 504, including instructions executable by processor 518 of apparatus 500 to perform the method of fingerprint identification in the method embodiments described above. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
In an exemplary embodiment, there is also provided a computer readable storage medium, which is a non-volatile computer readable storage medium, and in which a computer program is stored, the stored computer program being capable of implementing the fingerprint identification method provided in the above-mentioned embodiments of the present disclosure when being executed by a processing component.
The disclosed embodiments also provide a computer program product having instructions stored therein that, when run on a computer, enable the computer to perform the fingerprint identification method provided by the disclosed embodiments.
The disclosed embodiments also provide a chip comprising programmable logic circuits and/or program instructions that when executed are capable of performing the fingerprint identification method provided by the disclosed embodiments.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (14)
1. A fingerprint recognition device, the device comprising: an Organic Light Emitting Display (OLED), a liquid crystal layer for shielding light, a fingerprint sensor, and a processing unit;
the back surface of the OLED is attached to one side of the liquid crystal layer;
the other side of the liquid crystal layer is attached to the fingerprint sensor;
the processing unit is respectively and electrically connected with the OLED, the liquid crystal layer and the fingerprint sensor; the processing unit is used for controlling the liquid crystal layer to switch between a shading state and a light guiding state;
wherein the light shielding state is a state in which liquid crystal molecules in the liquid crystal layer are at a first torsion angle to shield light rays towards the fingerprint sensor; the light guiding state is a state that liquid crystal molecules in the liquid crystal layer are at a second torsion angle to conduct light rays towards the fingerprint sensor.
2. The apparatus of claim 1, wherein the device comprises a plurality of sensors,
the OLED is used for receiving a touch starting event and reporting the touch starting event to the processing unit;
the processing unit is used for sending a first control instruction to the liquid crystal layer according to the touch starting event;
the liquid crystal layer is used for switching from the shading state to the light guide state according to the first control instruction;
the fingerprint sensor is used for collecting reflected light transmitted through the liquid crystal layer and carrying out fingerprint identification.
3. The device of claim 2, wherein the OLED includes a highlight region thereon, the highlight region being a region corresponding to the fingerprint sensor;
the liquid crystal layer is further used for controlling the liquid crystal area corresponding to the highlight area to switch from the shading state to the light guiding state according to the first control instruction.
4. A device according to claim 2 or 3, characterized in that the OLED comprises a highlight region, which is a region corresponding to the fingerprint sensor;
the processing unit is further used for sending a second control instruction to the OLED according to the touch starting event;
the OLED is further used for controlling the highlight region to be in a highlight luminous state according to the second control instruction.
5. The apparatus according to any one of claim 2 to 4, wherein,
the OLED is used for receiving a touch ending event and reporting the touch ending event to the processing unit;
the processing unit is used for sending a third control instruction to the liquid crystal layer according to the touch ending event;
the liquid crystal layer is used for switching from the light guide state to the shading state according to the third control instruction.
6. The device of claim 5, wherein the OLED includes a highlight region thereon, the highlight region being a region corresponding to the fingerprint sensor;
the liquid crystal layer is further used for controlling the liquid crystal area corresponding to the highlight area to switch from the light guide state to the shading state according to the third control instruction.
7. The device of claim 5 or 6, wherein the OLED comprises a highlight region thereon, the highlight region being a region corresponding to the fingerprint sensor;
the processing unit is further configured to send a fourth control instruction to the OLED according to the touch end event;
the OLED is further used for controlling the highlight area to be in a normal light-emitting state according to the fourth control instruction.
8. A mobile terminal, characterized in that it comprises a fingerprint recognition device according to any one of claims 1 to 7.
9. A fingerprint identification method, characterized in that the method is applied to the fingerprint identification device according to claim 1, the method comprising:
the OLED receives a touch starting event and reports the touch starting event to the processing unit;
the processing unit sends a first control instruction to the liquid crystal layer according to the touch starting event;
the liquid crystal layer is switched from a shading state to a light guide state according to the first control instruction; wherein the light shielding state is a state in which liquid crystal molecules in the liquid crystal layer are at a first torsion angle and shield light rays towards the fingerprint sensor; the light guide state is a state that liquid crystal molecules in the liquid crystal layer are in a second torsion angle to conduct light rays towards the fingerprint sensor;
the fingerprint sensor collects reflected light transmitted through the liquid crystal layer and performs fingerprint identification.
10. The method of claim 9, wherein the OLED includes a highlight region thereon, the highlight region being a region corresponding to the fingerprint sensor;
the liquid crystal layer is switched from the shading state to the light guiding state according to the first control instruction, and comprises the following components:
and the liquid crystal layer controls the liquid crystal area corresponding to the highlight area to switch from the shading state to the light guiding state according to the first control instruction.
11. The method according to claim 9 or 10, characterized in that the OLED comprises a highlight area, which is an area corresponding to the fingerprint sensor;
after receiving the touch start event and reporting the touch start event to the processing unit, the OLED comprises:
the processing unit sends a second control instruction to the OLED according to the touch starting event;
and the OLED controls the highlight region to be in a highlight luminous state according to the second control instruction.
12. The method according to any one of claims 9 to 11, wherein the fingerprint sensor collects the reflected light transmitted through the liquid crystal layer, and after fingerprint identification, the method comprises:
the OLED receives a touch ending event and reports the touch ending event to the processing unit;
the processing unit sends a third control instruction to the liquid crystal layer according to the touch ending event;
the liquid crystal layer is switched from the light guide state to the shading state according to the third control instruction.
13. The method of claim 12, wherein the OLED includes a highlight region thereon, the highlight region being a region corresponding to the fingerprint sensor;
the liquid crystal layer is switched from the light guide state to the shading state according to the third control instruction, and the liquid crystal layer comprises:
and the liquid crystal layer controls the liquid crystal area corresponding to the highlight area to switch from the light guide state to the shading state according to the third control instruction.
14. The method according to claim 12 or 13, characterized in that the OLED comprises a highlight area, which is an area corresponding to the fingerprint sensor;
the OLED receives a touch end event, and after reporting the touch end event to the processing unit, the OLED includes:
the processing unit sends a fourth control instruction to the OLED according to the touch ending event;
and the OLED controls the highlight area to be in a normal light-emitting state according to the fourth control instruction.
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| CN107122748A (en) * | 2017-04-28 | 2017-09-01 | 北京小米移动软件有限公司 | Fingerprint identification method, device, equipment and storage medium |
| CN207182329U (en) * | 2017-09-12 | 2018-04-03 | 南昌欧菲生物识别技术有限公司 | Electronic equipment |
| CN107885002A (en) * | 2016-09-30 | 2018-04-06 | 北京小米移动软件有限公司 | Display panel, display device, the preparation method of array base palte and electronic equipment |
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| CN107885002A (en) * | 2016-09-30 | 2018-04-06 | 北京小米移动软件有限公司 | Display panel, display device, the preparation method of array base palte and electronic equipment |
| CN107122748A (en) * | 2017-04-28 | 2017-09-01 | 北京小米移动软件有限公司 | Fingerprint identification method, device, equipment and storage medium |
| CN207182329U (en) * | 2017-09-12 | 2018-04-03 | 南昌欧菲生物识别技术有限公司 | Electronic equipment |
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