CN107958145B

CN107958145B - Display device and electronic device

Info

Publication number: CN107958145B
Application number: CN201610969429.0A
Authority: CN
Inventors: 李问杰
Original assignee: Liuzhou Zibo Technology Co ltd
Current assignee: Liuzhou Zibo Technology Co ltd
Priority date: 2016-11-03
Filing date: 2016-11-03
Publication date: 2023-03-14
Anticipated expiration: 2036-11-03
Also published as: WO2018082401A1; CN107958145A

Abstract

The invention discloses a display device and an electronic device. The display device is used for performing image display and also used for performing biometric information sensing. The display device includes: a plurality of point light sources; the touch screen is used for determining a contact area of a target object on the display device; the controller is used for controlling the point light sources corresponding to the contact area to be lightened in a time-sharing manner so as to emit light signals to the target object; a plurality of light sensing elements for receiving the optical signals reflected by the target object and converting the received optical signals into corresponding electrical signals; and a processing circuit for determining biometric information of the target object from the electrical signal. The electronic device comprises the display device.

Description

Display device and electronic device

Technical Field

The present invention relates to the field of biometric identification, and more particularly, to a display device and an electronic device capable of performing biometric information sensing on a full screen.

Background

In the correlation technique, the principle of optics formula fingerprint identification module mainly utilizes the reflection of light at the glass apron surface to discern the millet spine information of fingerprint, because the finger is according to when pressing on the glass apron, the ridge and the glass apron contact of fingerprint, and the millet of fingerprint do not have with the glass apron to make the great difference appear in the millet of fingerprint and the reflection light of ridge, gather reflection light in order to realize the collection of fingerprint.

At present, optical fingerprint identification module mainly divide into two kinds, wherein, one kind is the fingerprint identification module that entrance guard was used commonly, and one kind is the fingerprint identification module for adopting the area source.

For a fingerprint identification module commonly used by the entrance guard, a bulb is generally adopted to emit light, and a camera is utilized to cooperate with an optical system to receive light reflected by a finger, so that fingerprint collection is realized. However, in order to acquire a clear image, the camera and the optical system are usually far from the glass cover plate. Accordingly, when the fingerprint identification module with a larger volume is combined with an electronic device (e.g., a mobile phone), the thickness of the electronic device is thicker, which is not favorable for the development of the electronic device toward a thinner and lighter electronic device.

For a fingerprint recognition module using a surface light source, the accuracy of collecting a fingerprint image formed by light emitted from the surface light source and reflected from a finger will be affected by the thickness of the glass cover plate, and when the thickness of the glass increases, the accuracy of the collected fingerprint image will decrease due to scattering of light. Accordingly, when such a fingerprint recognition module is placed under a front protective cover of a mobile phone, fingerprint sensing accuracy of the fingerprint recognition module may be insufficient due to a thick front protective cover.

Disclosure of Invention

The embodiment of the invention aims to solve at least one technical problem in the prior art. For this reason, embodiments of the present invention need to provide a display device and an electronic device capable of performing biometric information sensing in full screen.

The present invention provides a display device for performing image display and also for performing biometric information sensing, the display device including:

a plurality of point light sources;

the touch screen is used for determining a contact area of a target object on the display device;

the controller is used for controlling the point light sources corresponding to the contact area to be lightened in a time-sharing manner so as to emit light signals to the target object;

a plurality of light sensing elements for receiving the optical signal reflected by the target object and converting the received optical signal into a corresponding electrical signal; and

and the processing circuit is used for determining the biological characteristic information of the target object according to the electric signal.

Optionally, the display device includes a display module, the display module is configured to emit light and perform image display, the plurality of sensing elements are disposed in the display module, the display module includes a plurality of pixels, and the plurality of pixels are used as the plurality of point light sources, or areas where the pixels are located are respectively used to form the point light sources.

Optionally, the plurality of pixel points are self-luminous point light sources, or the display module further includes a backlight source, the backlight source is a surface light source, the controller controls the plurality of pixel points to correspondingly control whether light from the backlight source exits from the plurality of pixel points, and a region of each pixel point corresponding to the backlight source forms one of the point light sources.

Optionally, when the plurality of pixel points are self-luminous point light sources, the display module is an organic light emitting diode display module; when the display module assembly includes the backlight, the display module assembly is liquid crystal display module assembly.

Optionally, the touch screen includes a touch sensing layer and a touch detection circuit, the touch detection circuit is configured to drive the touch sensing layer to perform touch sensing, wherein the touch sensing layer is disposed above the display module or inside the display module.

Optionally, the display module includes a first substrate and a second substrate opposite to each other, the first substrate includes a first surface facing the second substrate, the second substrate includes a second surface facing the first substrate, the plurality of pixel points are disposed between the first substrate and the second substrate, and each pixel point includes a control switch, a pixel electrode, and a common electrode.

Optionally, the plurality of photosensitive elements, the control switches of the plurality of pixel points, and the pixel electrodes are all disposed on the first surface.

Optionally, the display module further includes a black matrix layer in a grid shape, and the light sensing element is disposed in a grid area corresponding to the black matrix layer and is configured to receive the light signal reflected by the target object passing through the grid area.

Optionally, the black matrix layer is disposed on the second surface.

Optionally, the display module further includes a color filter layer formed in a grid area of the black matrix layer, and the light sensing element is configured to receive a light signal reflected by the target object passing through the color filter layer.

Optionally, the plurality of pixel points are self-luminous color point light sources.

Optionally, the control switches and the pixel electrodes of the plurality of pixel points are disposed on the first surface, and the plurality of photosensitive elements are disposed on the second surface.

Optionally, the display module further includes a black matrix layer, the black matrix layer is disposed on the second surface, the black matrix layer is provided with an opening, and the opening accommodates the photosensitive element and enables the photosensitive element to receive the optical signal reflected by the target object.

Optionally, the photosensitive element includes one or more of a thin film transistor, a complementary metal oxide semiconductor transistor, and a charge-coupled device.

Optionally, the plurality of photosensitive elements are arranged in an array.

Optionally, each photosensitive element is disposed corresponding to a point light source, or a photosensitive element is disposed corresponding to an area where each point light source is located.

Optionally, the display device further includes a plurality of first scan lines and a plurality of first data lines, the plurality of first scan lines and the plurality of first data lines are arranged in an insulating and intersecting manner, the plurality of photosensitive elements are photosensitive transistors, gates of the photosensitive transistors are connected to the first scan lines, sources of the photosensitive transistors are connected to the first data lines, and drains of the photosensitive transistors are connected to the processing circuit.

Optionally, the display device further includes a first driving circuit, connected to the plurality of first scan lines and the plurality of first data lines, for providing a first scan signal to a gate of the photosensitive transistor through the first scan line to activate the photosensitive transistor, and the first driving circuit further provides a driving signal to a source of the activated photosensitive transistor through the first data line.

Optionally, the first driving circuit is further connected to the controller, and when sensing the biometric information is performed, the first driving circuit is under the control of the controller and is configured to drive the plurality of photosensitive elements to operate.

Optionally, the control switch is a transistor switch, the display module further includes a plurality of second scan lines and a plurality of second data lines, the plurality of second scan lines and the plurality of second data lines are arranged in an insulating and crossing manner, wherein the second scan lines are connected to gates of the transistor switches, the second data lines are connected to sources of the transistor switches, and the transistor switches are connected to the pixel electrodes.

Optionally, the plurality of first scan lines are disposed in parallel with the plurality of second scan lines, the plurality of first data lines are disposed in parallel with the plurality of second data lines, and the transistor switch and the light sensing transistor are disposed at an insulation intersection of each of the second scan lines and the second data lines, respectively.

Optionally, the display device further includes a second driving circuit, which is respectively connected to the second scan line and the second data line, and further connected to the controller, the controller drives the point light source to emit light by controlling the second driving circuit, the second driving circuit is configured to provide a second scan signal to the gate of the transistor switch through the second scan line to activate the transistor switch, and the second driving circuit further provides a driving signal to the pixel electrode through the second data line and the source of the activated transistor switch to enable the region where the pixel point is located to emit light.

Optionally, the transistor switch and the light sensing transistor are both thin film transistors, and the processes of the transistor switch and the light sensing transistor are the same.

Optionally, when the point light sources are controlled to be lighted in a time-sharing manner, the controller is configured to control a plurality of point light sources corresponding to the contact area to be lighted sequentially, or a plurality of point light sources at a predetermined distance to be lighted simultaneously.

Optionally, the biometric information includes fingerprint information, the horizontal precision of a fingerprint image formed by the fingerprint information is half of the horizontal width of the pixel point, and the vertical precision of the fingerprint image is half of the vertical width of the pixel point.

Optionally, when the display module displays an image, when the sensing of the biometric information is performed, the controller is further configured to control other areas of the display module outside the contact area to continue displaying the image.

Optionally, when the display module is in a screen-off state and when the biometric information sensing is performed, the controller is configured to control other areas of the display module outside the contact area to continue to be in the screen-off state.

Optionally, the biometric information includes any one or more of fingerprint information, palm print information, and ear print information.

Optionally, the plurality of light sensing elements are dispersed throughout an image display area of the display device so that biometric information sensing can be performed throughout the image display area.

The invention further provides an electronic device which is characterized by comprising the display device.

In the display device, because the display device adopts time-sharing lighting for the point light sources corresponding to the contact area of the target object, single-point lighting can be selected when the target object is scanned, and a plurality of point light sources with enough long preset intervals can also be selected to light, and accordingly, mutual influence of light rays reflected by the target object is small enough; in addition, the light can be collected by the photosensitive element by utilizing the mirror reflection principle, and the area of the reflected light collecting area of the photosensitive element is irrelevant to the thickness of the medium, so that the image precision of the target object is improved. Accordingly, the user experience of the electronic device with the display device is better.

In addition, the display device can realize full-screen execution of biological characteristic information sensing, and use experience of a user is further improved.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.

Drawings

The above and/or additional aspects and advantages of embodiments of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a block diagram of a biometric device according to an embodiment of the present invention;

fig. 2 is a schematic view of a biometric apparatus according to an embodiment of the present invention when sensing biometric information is performed;

FIG. 3 is a schematic diagram of the light sensing element of the biometric identification device receiving a reflected light signal in accordance with an embodiment of the present invention;

FIG. 4 is a schematic diagram of a display module of the biometric device according to the embodiment of the present invention;

FIG. 5 is a schematic view of the construction of a biometric device according to an embodiment of the present invention;

FIG. 6 is a schematic plan view of a display module of the biometric identification device according to the embodiment of the present invention;

FIG. 7 is a schematic view of a portion of a display module of the biometric identification device according to the embodiment of the present invention;

FIG. 8 is another schematic plan view of a display module of the biometric device in accordance with the exemplary embodiment of the present invention;

FIG. 9 is a schematic view of another part of the display module of the biometric device according to the embodiment of the present invention;

FIG. 10 is a schematic view of the distribution of the photosensitive elements of the biometric identification device according to the embodiment of the present invention;

fig. 11 is a schematic view of a distribution of point light sources corresponding to a contact area of the biometric authentication device according to the embodiment of the present invention;

fig. 12 is another distribution diagram of point light sources corresponding to a contact area of the biometric authentication device according to the embodiment of the present invention;

fig. 13 is a schematic plan view of an electronic device according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are in fact significant. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details, or with other structures, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.

Referring to fig. 1 and 2, a biometric device 100 according to an embodiment of the present invention includes a plurality of point light sources 102, a touch screen 104, a controller 106, a plurality of photosensitive elements 108, a processing circuit 110, a first driving circuit 111, and a second driving circuit 113.

The touch screen 104 is used to determine the contact area 112 of the target object 200 on the biometric device 100. The controller 106 is configured to control a plurality of point light sources 102 corresponding to the contact area 112 to be illuminated in time-sharing manner to emit light signals to the target object. When the sensing of the biometric information is performed, the first driving circuit 111 is used to drive the plurality of photosensitive elements 108 to operate under the control of the controller 106. The plurality of light sensing elements 108 are configured to receive the light signals reflected by the target object 200 and convert the received light signals into corresponding electrical signals. The processing circuit 110 is used to determine the biometric information of the target object 200 from the electrical signal. The controller 106 controls a plurality of point light sources 102 corresponding to the contact area 112 to be turned on in time division to emit light signals to the target object, for example, by controlling the second driving circuit 113.

In the biometric apparatus 100, since the biometric apparatus 100 performs time-sharing illumination on the plurality of point light sources 102 corresponding to the contact area of the target object 200, a single point light emission can be selected when scanning the target object 200, or a plurality of point light sources 102 having a predetermined distance therebetween can be selected to emit light, and accordingly, the mutual influence of the light rays reflected by the target object 200 is small enough; in addition, the light can be collected by the light sensing element 108 by using the mirror reflection principle, and the area of the light sensing element 108 through the reflected light collecting area is independent of the thickness of the medium, thereby improving the image accuracy of the collecting target object 200. Meanwhile, the time-sharing lighting of the point light source 102 may form complete image information of the target object 200.

The biometric device 100 may include or be integrated as a biometric chip for receiving contact or proximity of the target object 200 to sense image information of the target object 200. However, the present application is not limited thereto, and as described below, the portion of the biometric apparatus 100 used for capturing the image may also be formed in a display module of a display apparatus, and the display module is used for receiving the finger contact or approach of the user to sense the image information of the target object 200, so that the display apparatus can perform biometric information sensing on the full screen, thereby improving the user experience, and in addition, the electronic apparatus having the biometric apparatus 100 is also beneficial to being developed towards a light and thin direction.

The biometric information includes, for example, but not limited to, any one or more of fingerprint information, palm print information, and ear print information. Accordingly, the biometric device is, for example, a fingerprint recognition device, or a fingerprint recognition device in combination with a blood oxygen recognition device, etc.

Specifically, in some examples, the plurality of point light sources 102 are arranged in an array, and the plurality of photosensitive elements 108 are also arranged in an array. However, alternatively, in other examples, the plurality of point light sources 102 may be arranged in other regular or irregular manners, and the plurality of photosensitive elements 108 may be arranged in other regular or irregular manners. In addition, in the present embodiment, each of the photosensitive elements 108 is disposed corresponding to one of the point light sources 102 to achieve a better receiving effect.

In one example, referring to fig. 3, the line with an arrow in fig. 3 represents light, the thickness of the first medium 300 on the left side of the drawing is smaller than that of the second medium 302 on the right side of the drawing, and the collection area of the light sensing element 108 for the reflected light of the first target object 304 (e.g., finger) on the first medium 300 is the same as that for the reflected light of the second target object 306 (e.g., finger) on the second medium 302, thereby ensuring the image accuracy of the collected target object 200. The first medium 300 and the second medium 302 may be protective covers for the biometric device 100. It should be noted that fig. 3 only schematically illustrates the optical path during sensing the biometric information, the positional relationship between the light sensing element 108 and the point light source 102 is not limited to the positional relationship shown in fig. 3, and the positional relationship between the light sensing element 108 and the point light source 102 can be referred to in the following description of the embodiments of the present invention.

It should be noted that the light-sensing element 108 opposite to the valleys of the fingerprint mainly receives the light reflected from the mirror surface of the protective cover, and the light-sensing element 108 opposite to the ridges of the fingerprint mainly receives the light reflected from the ridges of the fingerprint diffusely, wherein the light reflected from the mirror surface is much stronger than the light reflected from the ridges of the fingerprint, so that after the light-sensing element 108 determines the positions of the valleys of the fingerprint according to the lines reflected from the mirror surface of the protective cover, for example, the positions of the ridges of the fingerprint can be determined together with the positions of the valleys of the fingerprint exclusively, or the light-sensing element 108 can determine the positions of the ridges and valleys of the fingerprint according to the intensity of the received light.

In sensing biometric information, referring to fig. 2, the target object 200 may be placed on the protective cover 101 of the electronic device to which the biometric device 100 is applied, the parameter value of a certain region 114 of the touch screen 104 changes, and the certain region 114 of the touch screen 104 corresponds to the contact region 112 of the target object 200 on the biometric device 100, so that the touch screen 104 may determine the contact region 112 of the target object 200 on the biometric device 100.

Preferably, the touch screen 104 may determine the contact area 112 of the target object 200 on the biometric device 100 using, for example and without limitation, capacitive sensing principles. The target object 200 is, for example, a finger.

In some embodiments, referring to fig. 4, the biometric apparatus 100 includes a display module 116, the display module 116 is used for emitting light and displaying images, the display module 116 includes a plurality of pixels 118, the plurality of pixels 118 are used as the plurality of point light sources 102, or the areas where the pixels 118 are respectively located are used for forming the point light sources 102.

Thus, the point light source 102 can be formed by using the pixel points 118 of the display module 116 or the area where the pixel points 118 are located, so that the display module 116 can be reused as a light source during sensing of the biometric information, and thus, when the biometric identification apparatus 100 performs sensing of the biometric information, no additional point light source is needed, thereby saving the cost of the biometric identification apparatus 100.

The controller 106, the driving

circuits

111 and 113, and the processing circuit 110 may be integrated in one chip, for example, and the chip may be connected to the display module 116, or the controller 106, the driving

circuits

111 and 113, and the processing circuit 110 may be independently disposed outside the display module 116 and connected to the display module 116.

In some embodiments, the plurality of pixels 118 are self-luminous point light sources 102, or the display module 116 further includes a backlight 120, the backlight 120 is a surface light source, the controller 106 controls the plurality of pixels 118 to correspondingly control whether the light from the backlight 120 exits from the plurality of pixels 118, and a region of each pixel 118 corresponding to the backlight 120 forms a point light source 102.

Thus, the range of selecting the type of the display module 116 is wide, so that the application range of the biometric identification apparatus 100 is wide.

Specifically, when the pixel 118 is a self-luminous point light source 102, the display module 116 may be an Organic Light Emitting Diode (OLED) display module, which may be an Active Matrix Organic Light Emitting Diode (AMOLED) or a passive organic light emitting diode (PMOLED) display module. When the display module 116 includes the backlight 120, the display module 116 is a liquid crystal display module.

More specifically, when the display module 116 is an organic light emitting diode display module, after the touch screen 104 determines the contact area 112 of the target object on the biometric device 100, the controller 106 controls a plurality of pixel points 118 corresponding to the contact area 112 to be illuminated in a time-sharing manner to emit optical signals to the target object 200.

When the display module 116 is a liquid crystal display module, after the touch screen 104 determines the contact area 112 of the target object 200 on the biometric device 100, the controller 106 controls the plurality of pixels 118 corresponding to the contact area 112 to transmit the light of the backlight 120 in a time-sharing manner, so that the light of the backlight 120 is transmitted to the target object 200 from the plurality of pixels 118 in a time-sharing manner, and the point light source 102 is turned on in a time-sharing manner. In such an embodiment, the pixel 118 is equivalent to a light switch, and the controller 106 controls the pixel 118 to determine whether the light from the backlight 120 exits the pixel 118.

In some embodiments, the touch screen 104 includes a touch sensing layer 105 and a touch detection circuit (not labeled) for driving the touch sensing layer 105 to perform touch sensing to determine the contact area 112, wherein the touch sensing layer 105 is disposed above the display module 116 or disposed inside the display module 116. The touch detection circuit is controlled by the timing of the controller 106, for example. When the touch sensing layer 105 is disposed inside the display module 116, the touch sensing layer 105 may be an additional electrode layer or a conductive element of the multiplexing display module 116.

Thus, the touch screen 104 is flexibly disposed, and the cost of the biometric device 100 is reduced.

Specifically, in one example, the touch sensing layer 105 of the touch screen 104 is disposed above the display module 116, so that the touch screen 104 can be manufactured separately, and after the manufacture is completed, the touch sensing layer 105 of the touch screen 104 is directly attached above the display module 116, as shown in fig. 5, which is a simple manufacturing process.

In another example, the touch sensing layer 105 of the touch screen 104 is disposed inside the display module 116, and in this case, some electrodes in the display module 116 may be reused as sensing electrodes of the touch screen 104, so as to reduce the cost of the biometric device 100 on the one hand and reduce the thickness of the biometric device 100 on the other hand.

In the example shown in fig. 2, the protective cover 101 is disposed over the display module 116. It can be understood that if the touch sensing layer 105 of the touch screen 104 is disposed above the display module 116, the touch sensing layer 105 of the touch screen 104 is located between the display module 116 and the protective cover 101.

In some embodiments, referring to fig. 4, the display module 116 includes a first substrate 122 and a second substrate 124 opposite to each other, the first substrate 122 includes a first surface 126 facing the second substrate 124, the second substrate 124 includes a second surface 128 facing the first substrate 122, a plurality of pixels 118 are disposed between the first substrate 122 and the second substrate 124, and each pixel 118 includes a control switch 130, a pixel electrode 132 and a common electrode 134.

Thus, the controller 106 can control the on and off of the control switch 130, for example, to make the area where the pixel 118 is located transmit light or not, so as to realize the illumination of the point light source 102.

Specifically, in an example, when the display module 116 is a liquid crystal display module, the backlight 120 of the liquid crystal display module may be disposed outside the second substrate 124, the backlight 120 of the liquid crystal display module is a surface light source, and the controller 106 controls whether the light source from the backlight 120 is emitted from the pixel 118 by controlling on and off of the control switch 130, so as to realize whether the point light source 102 formed in the area of the backlight 120 corresponding to the pixel 118 is turned on. The control switch 130 may be a Thin Film Transistor (TFT).

Further, in one example, the common electrode 134 can be reused as a sensing electrode of the touch screen 104, which can form a touch sensing layer of the touch screen 104. Wherein the common electrode 134 includes a plurality of sub-electrodes that are separated.

It should be noted that fig. 4 only illustrates one of the structures of the display module 116, and should not be construed as limiting the invention.

In some embodiments, referring to fig. 6, the plurality of photosensitive elements 108, the control switches 130 of the plurality of pixels 118, and the pixel electrodes 132 are disposed on the first surface 126.

Thus, the photosensitive element 108 can be formed while the control switch 130 and the pixel electrode 132 are formed on the first substrate 122, without increasing the process cost, thereby reducing the cost for disposing the photosensitive element 108.

In one example, the control switch 130 is, for example, a Thin Film Transistor (TFT), and a plurality of photosensitive elements 108 may be formed simultaneously with the formation of the control switch 130 and the pixel electrode 132 on the first substrate 122 by using a photolithography process (photolithography), so as to implement the arrangement of the plurality of photosensitive elements 108.

The control switch 130 is, for example, a transistor switch, the photosensitive element 108 is, for example, a photosensitive transistor, and when the control switch 130 and the photosensitive element 108 are both TFTs, they are made by, for example, but not limited to, the same process. In addition, when the photosensitive element 108 is a cmos transistor or a CCD, the processes of the photosensitive element 108 and the control switch 130 may be different.

In the embodiment of the invention, when the display module 116 is a liquid crystal display module, after the control switch 130, the pixel electrode 132 and the photosensitive element 108 are formed on the first substrate 122 and the common electrode 134 is formed on the second substrate 124, the liquid crystal is injected between the two substrates of the display module 116, and then the liquid crystal is encapsulated by the encapsulation body 400, so as to form the liquid crystal display module. A support 402 may be disposed between the two substrates to support the display module 116.

In some embodiments, referring to fig. 4 and 7, the display module 116 further includes a black matrix layer 136 in a grid shape, and the light sensing element 108 is disposed in a grid area 138 of the black matrix layer 136 and is configured to receive a light signal reflected by a target object 200 passing through the grid area 138.

In this way, even if the black matrix layer 136 exists in the display module 116, the light-sensing element 108 can receive the light signal reflected by the target object 200.

In particular, the black matrix layer 136 may be applied to a liquid crystal display module and an organic light emitting diode display module. In one example, one grid region 138 of the black matrix layer 136 may correspond to one pixel 118 region of the display module 116, and one photosensitive element 108 corresponds to one grid region 138.

In some embodiments, referring to fig. 7 and 9, a black matrix layer 136 is disposed on the second surface 128.

Thus, the black matrix layer 136 is formed on the second substrate 124, which simplifies the manufacturing process of the display module 116. In one example, the black matrix layer 136 may be formed on the second surface 128 by printing.

In some embodiments, referring to fig. 4, 7 and 9, the display module 116 further includes a color filter layer 140, the color filter layer 140 is formed on the grid region 138 of the black matrix layer 136, and the photosensitive element 108 is configured to receive the optical signal reflected by the target object 200 passing through the color filter layer 140.

Thus, the color filter layer 140 can be applied to a liquid crystal display module and an organic light emitting diode display module to realize the display module 116 displaying a color image.

Specifically, the color filter layer 140 may include three color layers of red, green, and blue, for example, and the arrangement of the three color layers may be the same as the arrangement of the pixels 118 of the display module 116.

When the color filter layer 140 is applied to an oled display module, white light is emitted from the self-emitting pixels of the oled display module, and the white light can be displayed as a color light after passing through the color filter layer 140.

In some embodiments, the plurality of pixels 118 are self-luminous color point light sources.

Thus, the self-emitting pixels 118 of the display module 116 can be directly used as point light sources to reduce the cost of the biometric apparatus 100.

Specifically, in one example, when the display module 116 is an organic light emitting diode display module, the pixels 118 of the display module 116 are self-luminous, and the plurality of pixels 118 of the display module 116 may include pixels emitting light of three primary colors, such as pixels emitting light of red, pixels emitting light of blue, and pixels emitting light of green, and each pixel 118 emitting light may be implemented by an organic light emitting diode.

In some embodiments, referring to fig. 8 and 9, the control switches 130 and the pixel electrodes 132 of the plurality of pixels 118 are disposed on the first surface 126, and the plurality of photosensitive elements 108 are disposed on the second surface 128.

Thus, the control switch 130 and the pixel electrode 132 are disposed separately from the photosensitive element 108, so that adverse effects of the photosensitive element 108 on the control switch 130 and the pixel electrode 132 can be reduced.

In some embodiments, the display module 116 further includes a black matrix layer 136, the black matrix layer 136 is disposed on the second surface 128, the black matrix layer 136 defines an opening 142, and the opening 142 accommodates the photosensitive element 108 and enables the photosensitive element 108 to receive the optical signal reflected by the target object 200.

Thus, the photosensitive element 108 accommodated in the black matrix layer 136 has less influence on the aperture ratio of the display module 116.

In addition, when the processing circuit 110, the first driving circuit 111 and the photosensitive element 108 are electrically connected, the connection lines between the processing circuit 110, the first driving circuit 111 and the photosensitive element 108 can be formed on the lower surface 144 of the black matrix layer 136, and then extend toward the photosensitive element 108 along the hole wall of the opening 142 and connect with the photosensitive element 108 to realize signal transmission.

In some embodiments, the photosensitive element 108 is a Semiconductor photosensitive element or other suitable type of photosensitive element, wherein the Semiconductor photosensitive element includes, but is not limited to, any one or more of a Thin Film Transistor (TFT), a Complementary Metal Oxide Semiconductor (CMOS) Transistor, a Charge-coupled Device (CCD), and other suitable types of Semiconductor photosensitive elements, which are not limited in this disclosure. The photosensitive element 108 may also be a photodiode, for example.

For example, taking the photosensitive element 108 as a TFT as an example, the active region material of the TFT is sensitive to light, so as to collect light.

Thus, the plurality of photosensitive elements 108 can be directly manufactured by a semiconductor process, so that the cost of the biometric device 100 is low.

For example, referring to fig. 10, in an embodiment of the invention, the photosensitive elements 108 may be arranged on the first surface 126 in an array. The first surface 126 of the biometric device 100 further includes a plurality of first scan lines G1 and a plurality of first data lines D1, for example, and the plurality of first scan lines G1 and the plurality of first data lines D1 are arranged to cross each other in an insulated manner. The plurality of photosensitive elements 108 are, for example, photosensitive transistors. The gate of the light sensing transistor 101 is connected to the first scan line G1, the source of the light sensing transistor is connected to the first data line D1, and the drain of the light sensing transistor is connected to the processing circuit 110. The plurality of first scan lines G1 and the plurality of first data lines D1 are connected to the first driving circuit 111.

The first driving circuit 111 is configured to provide a first scan signal to a gate of the photosensitive transistor through a first scan line G1 to activate the photosensitive transistor, and the first driving circuit 111 further provides a driving signal to a source of the activated photosensitive transistor through a first data line D1.

It should be noted that the above-mentioned circuit structures of the photosensitive element 108 and the first driving circuit 111 and the circuit relationship therebetween are only an embodiment of the present application, and the present application is not limited thereto, and the circuit structures of the photosensitive element 108 and the first driving circuit 111 and the circuit relationship therebetween may also be other suitable implementations as long as the first driving circuit 111 can drive the photosensitive element 108 to sense the light reflected by the target object and convert the light signal into an electrical signal.

Referring to fig. 6, the control switch 130 is, for example, a transistor switch, the display module 116 further includes a plurality of second scan lines G2 and a plurality of second data lines D2, the plurality of second scan lines G2 and the plurality of second data lines D2 are arranged in an insulated and crossed manner, wherein the second scan lines G2 are connected to the gates of the transistor switches, the second data lines D2 are connected to the sources of the transistor switches, and the transistor switches are connected to the pixel electrodes 132.

The second driving circuit 113 is connected to the second scan line G2 and the second data line D2, respectively, and further connected to the controller 106. The controller 106 drives the point light source 102 to emit light by controlling the second driving circuit 113, the second driving circuit 113 is configured to provide a second scanning signal to the gate of the transistor switch through the second scanning line G2 to activate the transistor switch, and the second driving circuit 113 further provides a driving signal to the pixel electrode 132 through the second data line D2 and the source of the activated transistor switch, so as to enable the area where the pixel point 118 is located to emit light.

The second driving circuit 113 can be further used to drive the pixel 118 to perform image display.

It should be noted that the structure of the display module 116 described above is only an example of the present application, and the present application is not limited thereto, and the structure of the display module 116 may also be other suitable embodiments, for example, the structure of the display module of the OLED is obviously different from the above structure, but is also applicable to the present application. For those skilled in the art, the display module according to the embodiment of the present application is conceivable

The plurality of first scan lines G1 and the plurality of second scan lines G2 are, for example but not limited to, arranged in parallel, the plurality of first data lines D1 and the plurality of second data lines D2 are, for example but not limited to, arranged in parallel, and the transistor switch and the photo transistor are respectively arranged at the insulation intersection of each second scan line G2 and each second data line D2.

It is noted that the connection lines connecting the photosensitive elements 108 and the connection lines connecting the control switches 130 of the pixel sites 118 are spaced apart from each other on the first surface 126.

In some embodiments, when the point light sources 102 are controlled to be lighted at different time, the controller 106 is configured to control several point light sources 102 corresponding to the contact area 112 to be lighted sequentially, or several point light sources 102 at a predetermined distance to be lighted simultaneously.

Thus, the time-sharing lighting manner is diversified, which is beneficial to the design flexibility of the controller 106.

Specifically, in one example, the plurality of point light sources 102 are arranged in an array, and the plurality of point light sources 102 corresponding to the contact area 112 are also arranged in an array, and the controller 106 can control the plurality of point light sources 102 in the array to be sequentially turned on from top to bottom and from left to right. However, alternatively, in other examples, the controller 106 may control the plurality of point light sources 102 to be sequentially illuminated according to other regular or irregular sequences.

Referring to fig. 11, fig. 11 shows an arrangement of several point light sources 102 corresponding to the contact area 112. The plurality of point light sources 102 corresponding to the contact region 112 are arranged in 5 rows and 4 columns to form 20 point light sources 102, and for convenience of description, the 20 point light sources 102 are respectively numbered as P11, P12, P13, \8230, P53 and P54.

When sensing the biometric information is performed, the controller 106 controls the point light source P11 to be turned on, controls the other point light sources 102 to be turned off, and receives the light signal reflected by the target object 200 through the photosensitive elements 108 around the point light source P11.

Then, the controller 106 controls the point light source P12 to be turned on, controls the other point light sources 102 to be turned off, and receives the light signal reflected by the target object 200 through the photosensitive elements 108 around the point light source P12. By analogy, the controller 106 completes the time-sharing lighting of all the 20 light sources 102 corresponding to the contact area 112, and the processing circuit 110 receives the electrical signal output by the photosensitive element 108 to determine the biometric information of the target object 200.

In another example, the predetermined distance may be a distance within the array that is spaced apart by one row of point light sources, several rows of point light sources, a column of point light sources, or several rows of point light sources.

Specifically, referring to fig. 12, in such an example, several dot light sources 102 corresponding to the contact region 112 are arranged in 6 rows and 4 columns to 24 dot light sources 102, and for convenience of description, the 24 dot light sources 102 are respectively numbered as T11, T12, T13, \8230;, T63, T64. In the example, the predetermined distance is two rows of point light sources apart.

When sensing the biometric information is performed, the controller 106 controls the point light sources T11 and T41 to be simultaneously turned on, controls the other point light sources 102 to be turned off, and receives the light signals reflected by the target object 200 through the light-sensing elements 108 around the point light sources T11 and T41.

Then, the controller 106 controls the point light sources T12 and T42 to be turned on simultaneously, controls the other point light sources 102 to be turned off, and receives the light signals reflected by the target object 200 by the photosensitive elements 108 around the point light sources T12 and T42. By analogy, the controller 106 completes the time-sharing lighting of all the 24 light sources 102 corresponding to the contact area 112, and the processing circuit 110 receives the electrical signal output by the photosensitive element 108 to determine the biometric information of the target object 200.

It should be noted that the above examples are provided for convenience of understanding the embodiments of the present invention, and should not be construed as limiting the scope of the present invention.

In some embodiments, the horizontal accuracy of the image of the target object 200 formed from the biometric information is half the horizontal width of the pixel points, and the vertical accuracy of the image of the target object 200 is half the vertical width of the pixel points.

Thus, mainstream electronic devices, such as mobile phones, tablet computers, notebook computers, and the like, can achieve the accuracy of acquiring the image of the target object 200, so that the application range of the biometric device 100 is wider.

Specifically, when the screen of the electronic device is 5 inches (for example, a mobile phone screen) and the resolution is 1920 × 1080, the width of the pixel 118 is about 60um, and the acquisition accuracy of the image of the target object 200 is 10um horizontally and 30um vertically.

When the screen of the electronic device is 13.3 inches (for example, a notebook computer screen) and the resolution is 1366 × 768, the width of the pixel 118 is about 220um, and the acquisition accuracy of the image of the target object 200 is 36um horizontally and 110um vertically.

When the screen of the electronic device is 22 inches (for example, the display screen of a personal computer) and the resolution is 1920 × 1080, the width of the pixel 118 is about 270um, and the acquisition accuracy of the image of the target object 200 is 45um horizontally and 135um vertically.

Taking the biometric information as the fingerprint information, it can be known from the above that the screen of the mainstream electronic device can realize the fingerprint image collection for distinguishing the fingerprint.

In some embodiments, when the display module 116 displays the image, the controller 106 is further configured to control other areas 146 of the display module 116 outside the contact area 112 to continue displaying the image when performing the sensing of the biometric information.

Thus, when the sensing of the biometric information is performed, the image display of the other area 146 of the display module 116 is not affected, and the user experience is ensured.

Specifically, referring to fig. 2, when sensing the biometric information, the finger 200 is pressed on the biometric device 100, the controller 106 identifies the contact area 112 of the finger on the biometric device 100, and further determines the other areas 146 of the display module 116 except the contact area 112, and then the controller 106 controls the point light sources 102 corresponding to the contact area 112 to be turned on at different times to complete the collection of the biometric information. Meanwhile, the controller 106 controls the other area 146 of the display module 116 to continue displaying images.

In some embodiments, when the display module 116 is in the off-screen state, the controller 106 is configured to control the other area 146 of the display module 116 outside the touch area 112 to continue to be in the off-screen state while the biometric information sensing is performed.

Thus, when the sensing of the biometric information is performed, the other areas 146 of the display module 116 are not affected to be in the screen-off state, and the user experience is ensured.

Specifically, when sensing the biometric information, the finger 200 presses the biometric device 100, the controller 106 identifies the contact area 112 of the biometric device 100, determines the other areas 146 of the display module 116 except the contact area 112, and then the controller 106 controls the point light sources 102 corresponding to the contact area 112 to be turned on at different times to complete the collection of the biometric information. Meanwhile, the controller 106 controls the other areas 146 of the display module 116 to continue to be in the off state.

Referring to fig. 13, a display device 400 according to an embodiment of the present invention includes the biometric authentication device 100 according to any of the above embodiments.

In the display device 400, the biometric authentication device 100 illuminates the point light sources 102 corresponding to the contact area of the target object 200 in a time-sharing manner, so that when the target object 200 is scanned, a single point light source can be selected, or a plurality of point light sources 102 with a predetermined distance therebetween can be selected to illuminate, and accordingly, the mutual influence of the light reflected by the target object 200 is small enough; in addition, the light can be collected by the photosensitive element 108 by using the mirror reflection principle, and the area of the region where the photosensitive element 108 collects light by reflecting light is independent of the thickness of the medium, thereby improving the accuracy of collecting the image of the target object 200. Meanwhile, the time-sharing lighting point light source 102 can form complete image information of the target object 200.

The display module 116 is, for example, an image display element of the display device 400, and since the photosensitive element 108 is disposed in the display module 116, the display device 400 can implement full-screen biometric information sensing, thereby improving the user experience. In addition, the electronic device 500 having the display device 400 is also advantageous to be slimmer. Further, since the biometric authentication device 100 multiplexes the point light source 102 and other elements of the display device, the manufacturing cost can be saved.

Specifically, the display device 400 may be, but is not limited to, a liquid crystal display device or an organic light emitting diode display device. Generally, the display device 400 includes a protective cover 101 (media, as shown in fig. 3) disposed on the outermost layer of the display device 400. A user's finger can perform operations such as sliding, clicking, etc. on the protective cover 101 to control the display of the display device 400. In performing biometric information sensing, a finger may be placed on the protective cover 101, the touch screen 104 determines a contact area 112 of the finger on the display device, and the biometric identification device 100 may enable the collection of biometric information.

Referring to fig. 13 again, an electronic device 500 according to an embodiment of the present invention includes the biometric apparatus 100 according to any of the above embodiments.

In the electronic device 500, since the biometric authentication device 100 performs time-sharing illumination on the plurality of point light sources 102 corresponding to the contact area of the target object 200, a single point light emission can be selected when scanning the target object 200, or a plurality of point light sources 102 with a predetermined distance therebetween can be selected to emit light, and accordingly, the mutual influence of the light rays reflected by the target object 200 is small enough; in addition, the light can be collected by the photosensitive element 108 by using the mirror reflection principle, and the area of the region where the photosensitive element 108 collects light by reflecting light is independent of the thickness of the medium, thereby improving the accuracy of collecting the image of the target object 200. Meanwhile, the time-sharing lighting of the point light source 102 may form complete image information of the target object 200.

Since the electronic device 500 includes the biometric device 100, accordingly, the electronic device 500 may have the following main three advantages.

First, the thickness of the biometric device 100 is thinner than that of a fingerprint recognition module using a camera, so that the thickness of the electronic device 500 having the biometric device 100 is thinner, which does not affect the development of the electronic device 500 towards the direction of thinning;

secondly, the sensing accuracy of the biometric device 100 is less affected by the thickness of the glass cover plate, so that the sensing accuracy of the biometric device 100 is less affected after the biometric device 100 is placed under the protective cover plate of the electronic device 500, thereby improving the user experience of the electronic device 500;

thirdly, when the electronic device 500 includes the display device 400, the portion of the biometric authentication device 100 used for image capturing may be disposed in the display module 116 of the display device 400, so that the electronic device 500 may perform capturing of the biometric information in a full screen manner, thereby further improving the user experience; in addition, the biometric device 500 can also use some existing elements in the display module 116 to realize a point light source, thereby saving materials, reducing the overall cost of the electronic device 500, and making the electronic device 500 lighter and thinner.

Specifically, the electronic device 500 is, for example, a consumer electronic product, a home electronic product, or a vehicle-mounted electronic product. The consumer electronic products are various electronic products applying biometric identification technology, such as mobile phones, tablet computers, notebook computers, desktop displays, all-in-one computers and the like. The household electronic products are various electronic products applying biological identification technology, such as intelligent door locks, televisions, refrigerators and the like. The vehicle-mounted electronic products are vehicle-mounted navigators, vehicle-mounted DVDs and the like.

In the example of fig. 13, the electronic device 500 is a mobile phone, and the front of the mobile phone is provided with the touch screen 104 and the display device 400, in one example, when the biometric information to be collected is fingerprint information, when fingerprint information collection is performed, the target object 200 is a finger, and the finger is placed on the touch screen 104 and the display device 400, so that the touch screen 104 can determine a contact area of the finger on the biometric identification device 100, and the biometric identification device 100 performs subsequent fingerprint information collection.

However, alternatively, in other embodiments, the biometric device 100 may not be disposed on the display device 400, and the image capturing part of the biometric device 100 may be integrated into a biometric chip and disposed at a suitable position, such as the front, back, and side of the electronic device 500, and may be exposed at the outer surface of the electronic device 500 or disposed inside the electronic device 500, adjacent to the housing.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention.

Claims

1. A display device for performing image display and also for performing biometric information sensing, the display device comprising:

a plurality of point light sources;

the controller is used for controlling the point light sources corresponding to the contact area to be turned on in a time-sharing mode so as to emit light signals to the target object, and is used for controlling other areas outside the contact area to be in a display or screen-off state continuously;

the controller controls the photosensitive elements around the lighted point light sources to receive the optical signals reflected by the target object and convert the received optical signals into corresponding electrical signals;

the display module is used for emitting light and executing image display, the photosensitive elements are arranged in the display module, the display module comprises a plurality of pixel points, and the pixel points are used as the point light sources or the areas where the pixel points are located are respectively used for forming the point light sources; and

processing circuitry to determine biometric information of the target object from the electrical signal;

the display module comprises a first substrate and a second substrate which are opposite, the first substrate comprises a first surface facing the second substrate, the second substrate comprises a second surface facing the first substrate, a plurality of pixel points are arranged between the first substrate and the second substrate, each pixel point comprises a control switch, a pixel electrode and a common electrode, the photosensitive elements, the control switches of the pixel points and the pixel electrodes are all arranged on the first surface, the first surface comprises a plurality of first scanning lines and a plurality of first data lines, the first scanning lines and the first data lines are arranged in an insulation and crossing mode, the photosensitive elements are photosensitive transistors, grids of the photosensitive transistors are connected with the first scanning lines, source electrodes of the photosensitive transistors are connected with the first data lines, drain electrodes of the photosensitive crystals are connected with the processing circuit, the display device further comprises a first driving circuit, the first driving circuit is connected with the first scanning lines and the first data lines and the first scanning lines and the first data lines are used for providing activation signals for the first scanning lines, and the first scanning lines are used for providing activation signals for the first scanning transistors, and the first scanning lines are used for activating the first scanning lines and for the first scanning lines and the first driving circuit and providing activation signals for the first scanning transistors when the photosensitive transistors are used for activating the first scanning transistors, the biological drive circuit, the biological control circuit, the biological drive circuit, and the biological control circuit, the biological sensor drive circuit, and the biological sensor.

2. The display device according to claim 1, wherein the plurality of pixels are self-luminous point light sources, or wherein the display module further comprises a backlight source, the backlight source is a surface light source, and the controller controls the plurality of pixels to correspondingly control whether light from the backlight source exits from the plurality of pixels, and a region of each of the pixels corresponding to the backlight source forms one of the point light sources.

3. The display device according to claim 2, wherein when the plurality of pixels are self-luminous point light sources, the display module is an organic light emitting diode display module; when the display module comprises the backlight source, the display module is a liquid crystal display module.

4. The display device according to claim 1, wherein the touch screen comprises a touch sensing layer and a touch detection circuit, the touch detection circuit is configured to drive the touch sensing layer to perform touch sensing, and the touch sensing layer is disposed above the display module or disposed inside the display module.

5. The display device according to claim 1, wherein the display module further comprises a black matrix layer in a grid shape disposed on the second surface, and the light sensing element is disposed in a grid area corresponding to the black matrix layer and is configured to receive a light signal reflected by the target object passing through the grid area.

6. The display device of claim 1, wherein the photosensitive element comprises one or more of a thin film transistor, a complementary metal oxide semiconductor transistor, and a charge coupled device.

7. The display device of claim 1, wherein the plurality of photosensitive elements are arranged in an array.

8. The display device according to claim 1, wherein the controller is configured to control a plurality of the point light sources corresponding to the contact area to be sequentially lighted or a plurality of the point light sources of a predetermined distance to be simultaneously lighted, when the point light sources are controlled to be lighted in time division.

9. The display device as claimed in claim 1, wherein the biometric information includes any one or more of fingerprint information, palm print information, and ear print information.

10. The display device according to claim 1, wherein the plurality of light sensing elements are dispersed throughout an image display area of the display device so that biometric information sensing can be performed throughout the image display area.

11. The display device of claim 1, wherein the common electrode is multiplexed as a sensing electrode of a touch screen.

12. An electronic device, characterized in that it comprises a display device according to any one of claims 1-11.