CN109753852A

CN109753852A - Optical module, display component and electronic equipment for object lines

Info

Publication number: CN109753852A
Application number: CN201711073040.9A
Authority: CN
Inventors: 魏文雄; 王帆; 沈奥; 李志勇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-11-03
Filing date: 2017-11-03
Publication date: 2019-05-14
Anticipated expiration: 2037-11-03
Also published as: CN109753852B

Abstract

This application provides a kind of optical modules, display component and electronic equipment for object lines, belong to field of display technology.The optical module is applied to the electronic equipment with display panel, which includes: light source, leaded light device and photodetector array.Wherein, light source is for issuing light, the light that leaded light device is used to that light source to be made to issue is propagated in leaded light device, and direct the light to the display side of display panel, and the area of leaded light device is greater than or equal to the area of display panel, photodetector array is in the display side of display panel, there are when object to be identified, receive the light of the object reflection to be identified, and the optical signal of the image of the object to be identified is used to indicate according to the photogenerated of the object reflection to be identified received, present application addresses the relevant technologies cannot achieve full frame fingerprint recognition, influence user experience, the poor problem of reliability, realize full frame identification, improve user experience, improve lines identification certainty, for electronic equipment.

Description

Optical module, display component and electronic equipment for object lines

Technical field

This application involves field of display technology, in particular to it is a kind of for the optical module of object lines, display component and Electronic equipment.

Background technique

Currently, Organic Light Emitting Diode (English: Organic Light-Emitting Diode；Referred to as: OLED) show Device because its self-luminous, contrast is high, thickness is thin, visual angle is wide and reaction speed is fast the advantages that, work played in personal lifestyle With more and more important, user often by many important personal information and office data storage in a display device, therefore, display dress The safety set becomes particularly important.The mode of the safety of common raising display device are as follows: for display device, password is set, Password such as can combine at the forms for password, figure or password and figure.However, aforesaid way is deposited in actual application In some problems, for example, there are problems that being easy leakage or be cracked, if password is more complex, deposit if password is simpler The big problem of difficulty is remembered in user.

In the related technology, in order to improve the safety of display device, the display component of display device uses fingerprint recognition skill Art, wherein optical fingerprint identification technology is widely adopted in fingerprint identification technology.For example, using optical fingerprint identification technology into The display component of row fingerprint recognition includes light source, optical detector and display panel.Light source and optical detector are arranged at specific bit It sets, light source for issuing light, optical detector is used to that it is anti-to receive user's finger there are when user's finger in the display side of display panel The light penetrated, and according to the optical signal of the photogenerated received the fingerprint image of fingerprint for identification.

However above-mentioned display component cannot achieve full frame fingerprint recognition, influence user experience, identification certainty is poor.

Summary of the invention

This application provides a kind of optical modules, display component and electronic equipment for object lines, can solve phase Pass technology cannot achieve full frame fingerprint recognition, influence user experience, the poor problem of identification certainty.The technical solution is such as Under:

In a first aspect, providing a kind of optical module for object lines, set applied to the electronics with display panel It is standby, comprising: light source, leaded light device and photodetector array.Wherein, light source is for issuing light, and leaded light device is for sending out light source Light out is propagated in leaded light device, and directs the light to the display side of display panel, and the area of leaded light device is greater than or equal to aobvious Show that the area of panel, photodetector array are used to that it is to be identified to receive this there are when object to be identified in the display side of display panel The light of object reflection, and it is used to indicate according to the photogenerated of object to be identified reflection received the image of the object to be identified Optical signal.Exemplary, object to be identified can be fingerprint or palmmprint.

In this application, leaded light device can propagate the light that light source issues in leaded light device, and direct the light to show The display side of panel, and the area of the leaded light device is greater than or equal to the area of display panel.So, aobvious in display panel Show that the object in any position of side can be detected, so any position of display panel can complete lines identification, Realize full frame identification.The use of leaded light device can also reduce the demand to quantity of light source simultaneously, thereby reduce display group The cost of part.

The setting position of the light source of the optical module, leaded light device and photodetector array can there are many, for example, light source The lower section in one end of display panel can be set, also can be set in the underface of display panel；Photodetector array can be with The non-displaying side of display panel is set；Leaded light device can be set between photodetector array and display panel, can also be with The cover board of display panel or the lower section of polaroid are set.

It is exemplary, the applicable electronic equipment of optical module can for smart phone, tablet computer, television set, display, The products or components having a display function such as laptop, wearable device, Digital Frame, navigator.Electronic equipment is shown Show that panel can be OLED display panel.

The photodetector array of optical module includes multiple optical detectors, for example display panel per inch can be correspondingly arranged 500 optical detectors, photodetector array can cover entire display panel.Exemplary, optical detector can be high-resolution Imaging sensor, such as can be for CMOS, CCD etc..

Optionally, leaded light device includes light guide plate and diffraction optical device, and diffraction optical device is arranged on light guide plate.Its In, the two sides of light guide plate are provided with light refraction layer, and the refractive index of light refraction layer is less than the refractive index of light guide plate.Diffraction optics device The display side for the light directing display panel that part is used to propagate in light guide plate.

The refractive index of the light refraction layer of light guide plate two sides is less than the refractive index of light guide plate, so that being incident to the light in light guide plate It can be totally reflected on the interface of light guide plate and light refraction layer, so that the light that light source issues passes in leaded light device It broadcasts.

Optionally, light refraction layer is formed by air or optical cement.Light guide plate can be by having the material of high transmittance to light It is made, exemplary, light guide plate can be made of PC, PMMA, PDMS or glass material.

Optionally, display panel has multiple pixels of rectangular arrangement, and each pixel includes multiple sub-pixels, example , each pixel may include 3 sub-pixels, also may include 5 sub-pixels.When each pixel includes 3 sub-pixels, this 3 sub-pixels can be red sub-pixel, green sub-pixels and blue subpixels.Diffraction optical device includes rectangular arrangement Multiple diffraction grating are passed through from the gap between multiple sub-pixels in display panel by the light of each diffraction grating, are avoided The picture that display component is shown is affected.It optionally, can be by adjusting the mode of the position of diffraction grating, or control The mode of the angle of emergence for the diffraction light that diffraction grating issues makes light by each diffraction grating from multiple sons in display panel Gap between pixel passes through.

In this application, the angle of emergence for the diffraction light that diffraction optical device issues can be less than preset angle angle value, make diffraction Light is not totally reflected in the cover board of display panel and the interface of air.

In addition, the angle of emergence for the diffraction light that diffraction optical device issues can also be greater than or equal to preset angle angle value, make to spread out Light is penetrated to be totally reflected in the cover board of display panel and the interface of air.When diffraction light is in the cover board of display panel and the boundary of air When face is totally reflected, it is not totally reflected, can be improved in the cover board of display panel and the interface of air compared to diffraction light The clarity of the image of object to be identified, and then improve the accuracy of lines identification.It is exemplary, it can be by the way that diffraction grating be arranged Screen periods and adjusting be incident to diffraction grating light incidence angle, make diffraction optical device issue diffraction light the angle of emergence More than or equal to preset angle angle value.

Wherein, preset angle angle value θ 1 meets: θ 1=arcsin (n2*sin θ 2/n1), n1 are the refractive index of light guide plate, and n2 is The refractive index of cover board, θ 2 are incidence angle of the diffraction light on the interface of cover board and air, and θ 2 meets: 2 > arcsin (n3/n2) of θ, N3 is the refractive index of air.

The angle of emergence for the diffraction light that diffraction optical device issues is greater than or equal to preset angle angle value, and diffraction light is in display panel Cover board and the interface of air be totally reflected, the reflectivity of diffraction light is 100%, the light of the interface reflection of cover board and air Intensity is bigger, so, the optical signal for the photogenerated that photodetector array is reflected according to the interface of cover board and air, and according to The difference of the optical signal for the photogenerated that the interface of cover board and object to be identified is reflected is bigger, to enable a processor to visit based on light The bigger optical signal of two species diversity that survey device array generates forms the image of the higher object to be identified of clarity.

Assuming that object to be identified can increase second contact surface for fingerprint in order to further increase the clarity of fingerprint image The difference of the intensity of the light of reflection and the intensity of the light of the first interface reflection.Wherein, second contact surface refers to the lid of display panel The interface of plate and air (i.e. existing air between fingerprint valley and cover board), the first interface refers to the boundary of cover board and fingerprint ridge Face.In order to increase second contact surface reflection light intensity and the first interface reflection light intensity difference, diffraction light can be made The angle of emergence for learning the diffraction light that device issues is greater than or equal to preset angle angle value, makes diffraction light in the i.e. display panel of second contact surface The interface of cover board and air is totally reflected.Due to the intensity of the light of the intensity and the first interface reflection of the light of second contact surface reflection Difference it is bigger, so the optical signal for the photogenerated that photodetector array is reflected according to second contact surface and being reflected according to the first interface Photogenerated optical signal difference it is bigger, thus enable a processor to based on photodetector array generate two species diversity it is bigger Optical signal formed the higher fingerprint image of clarity.

In general, display panel include: array substrate, for array substrate rise covering and protective effect encapsulated layer, according to The secondary polaroid that encapsulated layer is set far from array substrate side, Optical transparent adhesive and cover board.Cover board can be glass cover-plate.Light The leaded light device for learning component can be set between photodetector array and display panel, alternatively, the lid of display panel is arranged in The lower section of plate or polaroid.

Optionally, light source setting can be in the lower section of one end of display panel.Light source is arranged in one end of display panel Lower section, can reduce the thickness of optical module, reduce include optical module display component thickness, and then it includes aobvious for reducing The thickness for showing the electronic equipment of component meets user to the use demand of electronic equipment.

Further, in order to improve the light utilization efficiency of light source, and then lines recognition accuracy is improved, which may be used also To include: beam path alignment device, between light source and leaded light device, beam path alignment device is used to issue light source the setting of beam path alignment device Light converged and be coupled in leaded light device.The light that light source issues is coupled in leaded light device by beam path alignment device, The more light for enabling leaded light device to issue light source are propagated in leaded light device, and direct the light to the display of display panel Side, so that the intensity of the light for the object to be identified reflection for receiving photodetector array is higher, the light for improving light source is utilized Rate, and then improve the accuracy of lines identification.

Optionally, beam path alignment device includes plus lens and coupling grating.The focal position of plus lens is arranged in light source, Coupling grating is arranged between plus lens and leaded light device.Plus lens is for converging the light that light source issues for collimated light Beam；Coupling grating is for coupling collimated light beam in leaded light device.The light that light source issues passes through plus lens and coupling grating It is coupled in leaded light device, more light that leaded light device is issued light source are propagated in leaded light device, and will The display side of light directing display panel.

It is exemplary, coupling grating can be formed far from the side of display panel in light guide plate using nano-imprint process.

Optionally, the side wall in leaded light device also can be set in the light source for the optical module of object lines, at this In the case of kind, optical module no setting is required beam path alignment device simplifies the structure of optical module.

Optionally, light source may include multiple sub-light sources, and plus lens may include multiple sub-lens, multiple sub-light sources with Multiple sub-lens correspond.Exemplary, sub-lens can be lenticule, cylindrical lens or collimator, and collimator includes fast axle standard Straight device and slow axis collimator.

In addition, light source may be a laser, plus lens can be a lenticule or a cylindrical lens, laser setting In lenticule or the focal position of cylindrical lens.

Optionally, multiple diffraction grating are rectangular equidistant arrangement, and the spacing arranged is 20 microns~400 microns.

Optionally, the length of each diffraction grating is 5 microns~30 microns, and width is 5 microns~30 microns.

In addition, being directed to following full frame fingerprint identification technology, which can make the thickness of mobile terminal screen It is smaller, it can obtain meeting the more visible fingerprint image of fingerprint recognition demand, following full frame fingerprint can be advantageously applied to In identification technology, adaptive technique development trend.

Second aspect provides a kind of display component, including optical module described in display panel and first aspect.Due to The optical module can propagate the light that light source issues in leaded light device, and direct the light to the display side of display panel, and light is visited Surveying device array, there are the light for when object to be identified, receiving object to be identified reflection in the display side of display panel, and according to connecing The photogenerated of the object reflection to be identified received is used to indicate the optical signal of the image of the object to be identified, the face of leaded light device Product is greater than or equal to the area of display panel, so any position of display panel can complete lines identification, realizes full frame Identification, improves user experience, improves lines identification certainty.The use of leaded light device can also be reduced to light source number simultaneously The demand of amount thereby reduces the cost of display component.It, can be in addition, light source to be arranged in the lower section of one end of display panel The thickness for reducing electronic equipment meets user to the use demand of electronic equipment, and further, the light for also improving light source utilizes Rate improves the accuracy of lines identification.

Optionally, display panel is OLED display panel.

The third aspect provides a kind of electronic equipment, display component and processor (such as CPU) including second aspect, place Reason device is used to be formed the image of object to be identified according to the optical signal that the optical module of display component obtains.Due to the electronic equipment Display component include optical module for object lines, the leaded light device of the optical module can exist the light that light source issues It is propagated in leaded light device, and directs the light to the display side of display panel, photodetector array exists in the display side of display panel When object to be identified, the light of the object reflection to be identified is received, and according to the photogenerated of the object reflection to be identified received It is used to indicate the optical signal of the image of the object to be identified, and the area of leaded light device is greater than or equal to the area of display panel, So any position of display panel can complete lines identification, full frame identification is realized, user experience is improved, improves line Road identification certainty.The use of leaded light device can also reduce the demand to quantity of light source simultaneously, thereby reduce electronic equipment Cost.In addition, light source to be arranged in the lower section of one end of display panel, the thickness of electronic equipment can be reduced, user is met To the use demand of electronic equipment, further, the light utilization efficiency of light source is also improved, improve lines recognition accuracy.

Fourth aspect provides a kind of manufacturing method of optical module for object lines, this method comprises: shape respectively At light source, leaded light device and photodetector array.Wherein, light source is for issuing light, the light that leaded light device is used to that light source to be made to issue It is propagated in leaded light device, and directs the light to the display side of display panel, the area of leaded light device is greater than or equal to display panel Area, photodetector array is used for that there are when object to be identified, receive object to be identified reflection in the display side of display panel Light, and according to receive object to be identified reflection photogenerated be used to indicate object to be identified image optical signal.Show Example, object to be identified can be fingerprint or palmmprint.

The leaded light device that the manufacturing method is formed can propagate the light that light source issues in leaded light device, and direct the light to The display side of display panel, the area of leaded light device is greater than or equal to the area of display panel, so any bit of display panel Lines identification can be completed by setting, and realized full frame identification, improved user experience, and identification lines reliability, while shape are improved The demand to quantity of light source can also be reduced at leaded light device, thereby reduces the cost of display component.

Optionally, leaded light device includes light guide plate and diffraction optical device, correspondingly, forming leaded light device, comprising: leading Diffraction optical device is formed on tabula rasa, later, forms light refraction layer, light in the two sides for the light guide plate for being formed with diffraction optical device The refractive index of refracting layer is less than the refractive index of light guide plate, and diffraction optical device is used for the light directing display surface that will be propagated in light guide plate The display side of plate.

Optionally, display panel has multiple pixels of rectangular arrangement, and each pixel includes multiple sub-pixels, diffraction light Learn multiple diffraction grating that device includes rectangular arrangement can wrap correspondingly, forming diffraction optical device on light guide plate Include: forming multiple diffraction grating on light guide plate, by each diffraction grating light from multiple sub-pixels in display panel it Between gap pass through, the picture for avoiding display component from showing is affected.It optionally, can be by adjusting the position of diffraction grating Mode, or the mode of the angle of emergence of diffraction light that control diffraction grating issues makes light by each diffraction grating from aobvious Show that the gap between multiple sub-pixels in panel passes through.

Optionally, multiple diffraction grating are formed on light guide plate, may include: by nano-imprint process on light guide plate Form multiple diffraction grating.Exemplary, multiple diffraction grating are rectangular equidistant arrangement, and the spacing of arrangement can be 20 microns ~400 microns.The length of each diffraction grating 021 can be 5 microns~30 microns, and width can be 5 microns~30 microns.

Optionally, photodetector array is formed, comprising: form photodetector array in the non-displaying side of display panel.Show Example, 500 optical detectors can be correspondingly formed in the non-displaying side per inch of display panel.Photodetector array covering is entire Display panel.

In general, display panel includes cover board and polaroid, correspondingly, formation leaded light device, may include: in display panel Leaded light device is formed close to the side of photodetector array, leaded light device is between photodetector array and display panel；Or Person, display panel far from photodetector array side formed leaded light device, leaded light device be located at display panel cover board or The lower section of polaroid.

Optionally, light source is formed, may include: to form light source in the lower section of one end of display panel, so that light source is most The edge in outside is located at outside the outermost edge of upright projection of display panel.Light source is formed under one end of display panel Side can reduce the thickness of optical module, reduce the thickness of the display component including optical module, and then reducing includes display group The thickness of the electronic equipment of part meets user to the use demand of electronic equipment.

Alternatively, it is also possible to form light source in one end of display panel, light source is located on the same floor with display panel.

Optionally, optical module further include: beam path alignment device, correspondingly, the lower section in one end of display panel forms light After source, this method can also include: the formation beam path alignment device between light source and leaded light device, and beam path alignment device is used for light The light that source issues is converged and is coupled in leaded light device.

The light that light source issues is coupled in leaded light device by beam path alignment device, and leaded light device is enabled to send out light source More light out are propagated in leaded light device, and direct the light to the display side of display panel, so that photodetector array be made to connect The intensity of the light of the object to be identified reflection received is higher, improves the light utilization efficiency of light source, and then it is quasi- to improve lines identification Exactness.

Optionally, beam path alignment device includes plus lens and coupling grating, correspondingly, the shape between light source and leaded light device At beam path alignment device, comprising: form plus lens between light source and leaded light device, light source is made to be located at the focal length position of plus lens It sets；Coupling grating is formed between plus lens and leaded light device, the light convergence that plus lens is used to issue light source is collimation Light beam, coupling grating is for coupling collimated light beam in leaded light device.It is exemplary, it can be using nano-imprint process in leaded light Plate forms coupling grating far from the side of display panel.

Technical solution provided by the present application has the benefit that

Since leaded light device can propagate the light that light source issues in leaded light device, and direct the light to the aobvious of display panel Show side, photodetector array in the display side of display panel there are the light for when object to be identified, receiving object reflection to be identified, And the optical signal of the image of the object to be identified is used to indicate according to the photogenerated of the object reflection to be identified received, due to The area of leaded light device is greater than or equal to the area of display panel, so any position of display panel can complete lines knowledge Not, full frame identification is realized, user experience is improved, improves lines identification certainty.The use of leaded light device may be used also simultaneously To reduce the demand to quantity of light source.

Detailed description of the invention

Fig. 1 is a kind of structural representation of optical module and display panel for object lines provided in an embodiment of the present invention Figure；

Fig. 2 is that the structure of another optical module for being used for object lines and display panel provided in an embodiment of the present invention is shown It is intended to；

Fig. 3 is a kind of side view of leaded light device provided in an embodiment of the present invention；

Fig. 4-1 is a kind of structural schematic diagram of diffraction grating；

Fig. 4-2 is the propagation path schematic diagram for being incident to the light of diffraction grating shown in Fig. 4-1；

Fig. 5-1 be it is provided in an embodiment of the present invention another for object lines optical module and display panel structure Schematic diagram；

Fig. 5-2 is the schematic diagram of fingerprint reflected light provided in an embodiment of the present invention；

Fig. 5-3 is the top view of optical module shown in Fig. 5-1；

Fig. 6 is a kind of structural schematic diagram of diffraction grating provided in an embodiment of the present invention；

Fig. 7 is that the structure of another optical module and display panel that are used for object lines provided in an embodiment of the present invention is shown It is intended to；

Fig. 8-1 is the propagation path schematic diagram of the light provided in an embodiment of the present invention for being incident to light guide plate；

Fig. 8-2 is the work of optical module of the diffraction light when the cover board of display panel and the interface of air are totally reflected Process schematic；

Fig. 8-3 is the schematic diagram of fingerprint reflected light provided in an embodiment of the present invention；

Fig. 8-4 is the structural schematic diagram of OLED display panel in the related technology；

Fig. 9-1 be it is provided in an embodiment of the present invention another for object lines optical module and display panel structure Schematic diagram；

Fig. 9-2 is the schematic diagram for being provided with the mobile terminal screen of fingerprint identification region；

Figure 10-1 is a kind of flow chart for forming leaded light device provided in an embodiment of the present invention；

Figure 10-2 is that the two sides provided in an embodiment of the present invention in the light guide plate for being formed with diffraction optical device form light folding Penetrate the flow chart of layer.

Specific embodiment

To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with attached drawing to the application embodiment party Formula is described in further detail.

Currently, the mode of the safety of common raising display device are as follows: for display device, password is set, it is exemplary, it is close Code such as can combine at the forms for password, figure or password and figure.But these modes have one in actual application A little problems, for example, there are problems that being easy leakage or be cracked if password is simpler；If password is more complex, exists and use Remember the big problem of difficulty in family.In the related technology, in order to improve the safety of display device, the display component of display device is often adopted With fingerprint identification technology, fingerprint identification technology provides great convenience for user, improves user experience.

Current fingerprint identification technology mainly includes three kinds: capacitive fingerprint identification technology, ultrasonic fingerprint identification technology and light Learn fingerprint identification technology.Compared to capacitive fingerprint identification technology and ultrasonic fingerprint identification technology, optical fingerprint identification technology is more It is concerned.It uses optical fingerprint identification technology to carry out the display component of fingerprint recognition at present to include light source, optical detector and show Show panel.Light source and optical detector are arranged at designated position, and light source is used for for issuing light, optical detector in display panel It side is shown there are when user's finger, receives the light of user's finger reflection, and according to the photogenerated received fingerprint for identification The optical signal of fingerprint image.Later, processor (such as CPU)) optical signal that is obtained according to display component forms fingerprint image.Due to Light source and optical detector are arranged in designated position, so being only able to achieve local identification, cannot achieve full frame fingerprint recognition.

And the optical module provided in an embodiment of the present invention for object lines includes leaded light device, which can The light that light source issues is propagated in leaded light device, and directs the light to the display side of display panel, and the area of the leaded light device More than or equal to the area of display panel.So, the object in any position that display panel shows side can be by It detects, so any position of display panel can complete lines identification, realizes full frame identification.

Fig. 1 is a kind of structural representation of optical module and display panel for object lines provided in an embodiment of the present invention Figure, the optical module are applied to the electronic equipment with display panel.Exemplary, which can be smart phone, put down The production having a display function such as plate computer, television set, display, laptop, wearable device, Digital Frame, navigator Product or component.

The optical module includes: light source 21, leaded light device 22 and photodetector array 23.The light source 21 of the optical module, The setting position of leaded light device 22 and photodetector array 23 can there are many, for example, light source can be set in display panel The lower section of one end also can be set in the underface of display panel；Photodetector array can be set in the non-aobvious of display panel Show side；Leaded light device can be set between photodetector array and display panel, and the cover board in display panel also can be set Or the lower section of polaroid.Wherein, light source is arranged in below one end of display panel and refers to: the outermost margin location of light source In outside the outermost edge of upright projection of display panel.The lower section of one end of display panel 00, light are arranged in light source 21 by Fig. 1 The non-displaying side of display panel 00 is arranged in detector array 23, and leaded light device 22 is arranged in photodetector array 23 and display surface It is illustrated between plate 00.

Referring to Fig. 1, light source 21 is for issuing light.

The light that leaded light device 22 is used to that light source 21 to be made to issue is propagated in leaded light device 22, and directs the light to display panel 00 Display side, wherein the area of leaded light device 22 be greater than or equal to display panel 00 area.Fig. 1 illustrates leaded light The area of device 22 is greater than the area of display panel 00.

Photodetector array 23 is used to receive and be somebody's turn to do wait know there are when object 001 to be identified in the display side of display panel 00 The light of other object reflection, and it is used to indicate according to the photogenerated of object reflection to be identified received the figure of the object to be identified The optical signal of picture.The photodetector array 23 includes multiple optical detectors, for example display panel per inch can be correspondingly arranged 500 A optical detector, photodetector array 23 can cover entire display panel, that is to say, 23 region of photodetector array Area is equal to the area of display panel.

Exemplary, object to be identified can be fingerprint or palmmprint.Display panel can be OLED display panel.

Leaded light device shown in FIG. 1 can propagate the light that light source issues in leaded light device, and direct the light to display surface The display side of plate, the area of leaded light device are greater than or equal to the area of display panel.Photodetector array is in the aobvious of display panel Show that there are the light for when object to be identified, receiving the object reflection to be identified for side, and is reflected according to the object to be identified received Photogenerated be used to indicate the object to be identified image optical signal.Later, processor is formed to be identified according to the optical signal The image of object, and the image of the object to be identified is compared with the image being pre-stored in image library, if the two is kissed It closes, then identifies success.Since the area of leaded light device is greater than or equal to the area of display panel, so any bit of display panel Lines identification can be completed by setting, and realize full frame identification.The use of leaded light device can also reduce the need to quantity of light source simultaneously It asks, thereby reduces the cost of display component.In addition, light source to be arranged in the lower section of one end of display panel, light can be reduced The thickness of component is learned, reduces the thickness of the display component including optical module, and then reduce the electronic equipment including display component Thickness, meet user to the use demand of electronic equipment.

The identification operation of the optical module can be used for unlock, quick payment, quick registration software of electronic equipment etc. and answer With.By taking the unlock of electronic equipment application as an example, if identifying successfully, user can use electronic equipment.

It should be noted that the image of object to be identified is formed according to the optical signal about processor, and based on to be identified The process that the image of object identifies object lines to be identified can with reference to the relevant technologies, the embodiment of the present invention to this no longer It repeats.

In conclusion the optical module provided in an embodiment of the present invention for object lines, since leaded light device can incite somebody to action The light that light source issues is propagated in leaded light device, and directs the light to the display side of display panel, and photodetector array is in display surface There are the light for when object to be identified, receiving the object reflection to be identified for the display side of plate, and according to the object to be identified received The photogenerated of body reflection is used to indicate the optical signal of the image of the object to be identified, since the area of leaded light device is greater than or equal to The area of display panel realizes full frame identification, improves use so any position of display panel can complete lines identification Family experience, improves lines identification certainty.The use of leaded light device can also reduce the demand to quantity of light source simultaneously.Separately Outside, light source is arranged in the lower section of one end of display panel, the thickness of electronic equipment can be reduced, meets user to electronic equipment Use demand.

Fig. 2 is that the structure of another optical module for being used for object lines and display panel provided in an embodiment of the present invention is shown Be intended to, the optical module be applied to display panel electronic equipment, as shown in Fig. 2, the optical module include: light source 21, Leaded light device 22 and photodetector array 23.The lower section of one end of display panel 00, optical detector battle array are arranged in light source 21 by Fig. 2 The non-displaying side of display panel 00 is arranged in column 23, and leaded light device 22 is arranged between photodetector array 23 and display panel 00 For be illustrated.

Referring to fig. 2, light source 21 is for issuing light.

The light that leaded light device 22 is used to that light source 21 to be made to issue is propagated in leaded light device 22, and directs the light to display panel 00 Display side, wherein the area of leaded light device 22 be greater than or equal to display panel 00 area.Fig. 2 illustrates leaded light The area of device 22 is greater than the area of display panel 00.Display panel 00 includes cover board 231.

Photodetector array 23 is used to receive and be somebody's turn to do wait know there are when object 001 to be identified in the display side of display panel 00 The light of other object reflection, and it is used to indicate according to the photogenerated of object reflection to be identified received the image of object to be identified Optical signal.Photodetector array 23 includes multiple optical detectors, for example 500 optical detections are arranged in per inch on display panel Device, photodetector array 23 can cover entire display panel.Object to be identified can be fingerprint or palmmprint.

Optionally, optical detector can be high-resolution imaging sensor, for example, optical detector can be complementary metal Oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS), charge coupled cell (Charge-coupledDevice, CCD) etc..

Referring to fig. 2, leaded light device 22 may include light guide plate 221 and diffraction optical device 222, diffraction optical device 222 It is arranged on light guide plate 221.

The two sides of light guide plate 221 are provided with light refraction layer 2210, and the refractive index of light refraction layer 2210 is less than light guide plate 221 Refractive index.The display side for the light directing display panel that diffraction optical device is used to propagate in light guide plate.

Wherein, light guide plate can be by there is the material of high transmittance to be made light, and exemplary, light guide plate can be by poly- carbonic acid Ester (Polycarbonate, PC), polymethyl methacrylate (PolymethylMethacrylate, PMMA), poly dimethyl silicon Oxygen alkane (polydimethylsiloxane, PDMS) or glass material are made.Light guide plate with high transmittance is convenient for making wait know The light of other object reflection reaches photodetector array by light guide plate.

The refractive index of the light refraction layer 2210 of 221 two sides of light guide plate is less than the refractive index of light guide plate 221, leads so that being incident to Light in tabula rasa 221 can be totally reflected on interface of the light guide plate 221 with light refraction layer 2210, so that light source issues Light propagated in leaded light device.Assuming that light guide plate is made of refractive index of 1.585 PC material, the refractive index of light refraction layer is 1.3, then the critical angle C1=arcsin (1.3/ that light is totally reflected on light guide plate and light refraction layer interface in light guide plate 1.585) 55 ° of ≈, so, when incidence angle of the light being incident in light guide plate on the interface of light guide plate and light refraction layer is greater than 55 °, for example the light being incident in light guide plate, when the incidence angle on the interface of light guide plate and light refraction layer is 60 °, light is in leaded light It can be totally reflected on the interface of plate and light refraction layer.

Exemplary, light refraction layer can be formed by air or optical cement, that is to say, as shown in Fig. 2, light guide plate 221 can be with It is provided with air layer between display panel 00 and photodetector array 23 respectively, which is light refraction layer.Alternatively, leading Tabula rasa 221 can be provided with optical adhesive layer between display panel 00 and photodetector array 23 respectively, which is Light refraction layer.The embodiment of the present invention to the generation type of light refraction layer without limitation.

As shown in Fig. 2, the light directing display panel 00 that diffraction optical device 222 is used to propagate in light guide plate 221 is aobvious Show side.In order to which there are when object to be identified, receive the object to be identified in the display side of display panel 00 for photodetector array 23 The light of body reflection, and the image of the object to be identified is used to indicate according to the photogenerated of the object reflection to be identified received Optical signal.Wherein, the guide direction of light is direction indicated by u in Fig. 2.

Optionally, display panel has multiple pixels of rectangular arrangement, and each pixel includes multiple sub-pixels, example , each pixel may include 3 sub-pixels, also may include 5 sub-pixels.When each pixel includes 3 sub-pixels, this 3 sub-pixels can be red sub-pixel, green sub-pixels and blue subpixels.

Fig. 3 shows the side view of leaded light device, and leaded light device includes light guide plate 221 and diffraction optical device 222.Diffraction Optical device 222 may include multiple diffraction grating 021 of rectangular arrangement, by the light of each diffraction grating 021 from display The gap between multiple sub-pixels in panel passes through, and so, the picture for avoiding display component from showing is affected.It is optional , it can be by adjusting the mode of the position of diffraction grating, or control the side of the angle of emergence for the diffraction light that diffraction grating issues Formula makes to pass through by the light of each diffraction grating from the gap between multiple sub-pixels in display panel.

In order to make reader more profoundly understand the embodiment of the present invention, it is simple that one now is done to the structure of diffraction grating and principle Explanation.Firstly, referring to fig. 4-1, Fig. 4-1 shows a kind of structural schematic diagram of diffraction grating 021, diffraction grating belongs to a kind of light Department of the Chinese Academy of Sciences's part comprising the grating tooth 0211 of multiple periodic arrangements.The screen periods d of diffraction grating refers to the two of arbitrary neighborhood The distance at the center of a grating tooth, the magnitude of screen periods and the magnitude of optical wavelength are same magnitude.Each light of diffraction grating The magnitude of the height H of grid tooth 0211 and the magnitude of optical wavelength are also same magnitude.The screen periods of diffraction grating and each grating The height of tooth can be arranged according to actual needs, exemplary, and the screen periods of diffraction grating can be 300 nanometers, Mei Geguang The height of grid tooth can be 300 nanometers.

Fig. 4-2 shows the propagation path schematic diagram for being incident to the light of diffraction grating shown in Fig. 4-1, in Fig. 4-2, R1 and R2 is the light for being incident to diffraction grating,For be incident to diffraction grating light incidence angle, θ is the light for being incident to diffraction grating Angle of diffraction when diffraction occurs on the diffraction grating, d is the screen periods of diffraction grating.It is available by Fig. 4-2,θ and d Between there are following relationships:Wherein, λ is the wavelength for being incident to the light of diffraction grating, m be into It is incident upon diffraction time when diffraction occurs on the diffraction grating for the light of diffraction grating, m can be equal to 0, ± 1, ± 2 etc..M is equal to+1 When diffraction be positive first-order diffraction (light of positive first-order diffraction is known as positive first-order diffraction light)；Negative one grade is diffracted to when m is equal to -1 Diffraction, and so on, diffraction when m is equal to+2 is positive second-order diffraction.In diffraction process, multiorder diffractive can be existed simultaneously. It optionally, in practical applications, can height, the duty ratio (duty ratio of grating tooth by adjusting the grating tooth of diffraction grating =c1/ (c1+p1), c1 are the width of a grating tooth, and p1 is the width in a gap adjacent with the grating tooth) etc. parameters Size adjusts the intensity of every grade of diffraction light.And by formulaIt is found that when using diffraction grating pair Incidence angle isLight generate the positive first-order diffraction light perpendicular to diffraction grating, that is to say when θ=0 °, then have: So having:It that is to say, when θ=0 °, the wave of the screen periods of diffraction grating and the light for being incident to diffraction grating The incidence angle of long, to be incident to diffraction grating light is related.

As shown in Fig. 2, incidence angle is when the light being incident in light guide plate 221 reaches diffraction optical device 222Light The light energy of the overwhelming majority is carried by 0 grade of diffraction light caused by diffraction optical device 222,0 grade of diffraction light is still according to light Direction originally is propagated, and is totally reflected in light guide plate, and propagate in leaded light device.And incidence angle isLight by spreading out Penetrate positive first-order diffraction light caused by optical device 222 and carry a small amount of light energy, the positive first-order diffraction light according to perpendicular to The direction of light guide plate 221 is projected towards the display side of display panel, is directed to the display side of display panel, and then reach to be identified Object 001, that is to say, the diffraction angle being incident to when diffraction occurs on the diffraction grating for the light of diffraction grating in Fig. 4-2 is 0 °. It is assumed that being incident to the incidence angle of the light of diffraction gratingIt is 60 °, the wavelength X for being incident to the light of diffraction grating is 532 nanometers, that It is based on formulaIt is available, d=532/sin60 ° of the screen periods of diffraction grating= 614.3, i.e. the screen periods of diffraction grating are 614.3 nanometers.

In the achievable mode of another kind, in order to improve the light utilization efficiency of light source, and then lines recognition accuracy is improved, used It can also include beam path alignment device in the optical module of object lines, the light which is used to issue light source converges Gather and is coupled in leaded light device.It is exemplary, the optical module can as shown in fig. 5-1, the optical module include: light source 21, Leaded light device 22 and photodetector array 23.The lower section of one end of display panel 00 is arranged in Fig. 5-1 equally with light source 21, and light is visited The non-displaying side that display panel 00 is arranged in device array 23 is surveyed, leaded light device 22 is arranged in photodetector array 23 and display panel It is illustrated between 00.

Wherein, light source 21 is for issuing light.

The light that leaded light device 22 is used to that light source to be made to issue is propagated in leaded light device 22, and directs the light to display panel 00 Show side, wherein the area of leaded light device 22 is greater than or equal to the area of display panel 00.Fig. 5-1 illustrates leaded light The area of device 22 is greater than the area of display panel 00.

Photodetector array 23 is used to receive and be somebody's turn to do wait know there are when object 001 to be identified in the display side of display panel 00 The light of other object reflection, and it is used to indicate according to the photogenerated of object reflection to be identified received the figure of the object to be identified The optical signal of picture.

Leaded light device 22 may include light guide plate 221 and diffraction optical device 222, and the setting of diffraction optical device 222 is being led On tabula rasa 221.The display side for the light directing display panel that diffraction optical device is used to propagate in light guide plate.Diffraction optical device 222 may include multiple diffraction grating 021 of rectangular arrangement.The two sides of light guide plate 221 are provided with light refraction layer 2210, light The refractive index of refracting layer 2210 is less than the refractive index of light guide plate 221.

The optical module further include: beam path alignment device 24, the setting of beam path alignment device 24 light source 21 and leaded light device 22 it Between.Beam path alignment device 24 is for converging the light that light source 21 issues and being coupled in leaded light device 22.

Optionally, as shown in fig. 5-1, beam path alignment device 24 may include plus lens 241 and coupling grating 242.Wherein, Light source 21 is arranged in the focal position of plus lens 241, the setting of coupling grating 242 plus lens 241 and leaded light device 22 it Between.

Plus lens 241 is for converging the light that light source 21 issues for collimated light beam.

Coupling grating 242 is for coupling collimated light beam in leaded light device 22.

The light that light source issues is coupled in leaded light device by plus lens and coupling grating, enables leaded light device More light that light source issues are propagated in leaded light device, and direct the light to the display side of display panel.

It is exemplary, as shown in fig. 5-1, it can be formed in light guide plate far from the side of display panel using nano-imprint process Coupling grating.In addition, in practical applications, coupling grating need on light guide plate can also be determined according to the size of plus lens The region area size to be occupied.

Assuming that the object to be identified of the display side of display panel is fingerprint, then the work of optical module shown in Fig. 5-1 Process can be with are as follows: light source 21 issues light, and plus lens 241 converges the light that light source 21 issues for collimated light beam, coupling grating 242 It couples collimated light beam in the light guide plate 221 of leaded light device 22.The light in light guide plate 221 is incident in light guide plate 221 and light It is totally reflected on the interface of refracting layer 2210, the light being totally reflected is generated by diffraction grating 021 perpendicular to diffraction grating And the positive first-order diffraction light propagated (direction of propagation is direction indicated by u in Fig. 5-1).Positive first-order diffraction light passes through display panel Reach the cover board 231 of display panel 00 and the interface of fingerprint 001.And fingerprint is that human body is inherent, unique and can be with him The invariant features that people distinguishes, fingerprint are made of a series of fingerprint ridge on finger tip skin surface and fingerprint valley, these refer to The composition details of wrinkle ridge and fingerprint valley generally include the bifurcated of fingerprint ridge, the end of fingerprint ridge, arch, the arch of tent-type, a left side The details such as rotation, dextrorotation, spiral or bispin, these Details uniqueness of fingerprint image.As shown in Fig. 5-2, when finger connects When touching 231 surface of cover board, fingerprint ridge is contacted with cover board 231, and there are air between fingerprint valley and cover board 231.Due to display surface The refractive index of the fingerprint ridge of 231 surface of the cover board contact of plate 00 is greater than the refractive index of the air between cover board 231 and fingerprint valley, institute With, the intensity of the light of fingerprint spinal reflex is different from the intensity for the light that fingerprint valley reflects, so, the light that fingerprint 001 reflects Intensity just carries the area information of fingerprint, which is used to indicate fingerprint ridge or fingerprint valley.Finally, as shown in fig. 5-1, Photodetector array 23 is according to the optical signal of the photogenerated of fingerprint spinal reflex and the optical signal of the photogenerated according to fingerprint valley reflection Difference, so, two kinds of optical signals that processor can be generated based on photodetector array 23 form fingerprint image.

Other mark meanings can refer to Fig. 2 in Fig. 5-1.

Fig. 5-3 shows the top view of optical module shown in Fig. 5-1, and as shown in Fig. 5-3, the setting of beam path alignment device 24 exists Between light source 21 and the light guide plate 221 of leaded light device.Beam path alignment device 24 includes plus lens 241 and coupling grating 242, light source 21 are arranged in the focal position of plus lens 241.Diffraction optical device includes multiple diffraction grating 021 of rectangular arrangement.

Optionally, as shown in Fig. 5-3, light source 21 may include multiple sub-light sources 211, and plus lens 241 may include more A sub-lens 2411, multiple sub-light sources and multiple sub-lens correspond.Exemplary, sub-lens can be lenticule, cylindrical lens Or collimator, collimator include fast axis collimation device and slow axis collimator.The embodiment of the present invention to the types of sub-lens without limitation.

Optionally, as shown in Fig. 5-3, multiple diffraction grating 021 are rectangular equidistant arrangement, and the space D arranged can Think 20 microns~400 microns.In practical applications, multiple diffraction grating that diffraction optical device includes can be with resolution ratio The display panel of 600 per inch pixels (Pixel Per Inch, PPI) is used cooperatively.The resolution ratio of display panel is higher, diffraction The spacing for the diffraction grating arrangement that optical device includes is smaller.

Exemplary, as shown in fig. 6, the length a of each diffraction grating 021 can be 5 microns~30 microns, width b can be with It is 5 microns~30 microns.

For the structure of optical module shown in simplification figure 5-1, it can will to be used for object in realization mode at another The light source of the optical module of lines is arranged on the side wall of leaded light device, in this case, optical module no setting is required optical path Collimator.Exemplary, which can be as shown in fig. 7, the optical module includes: that light source 21, leaded light device 22 and light are visited Survey device array 23.The non-displaying side of display panel 00 is arranged in photodetector array 23 by Fig. 7, and the setting of leaded light device 22 is visited in light It is illustrated for surveying between device array 23 and display panel 00.Referring to Fig. 7, since the side of leaded light device 22 is arranged in light source 21 On wall, light source 21 and leaded light device 22 are located on the same floor, in this way, optical module can not have to setting beam path alignment device.

The meaning that other in Fig. 7 mark can referring to figs. 2 and 5-1.

It should be added that the optical module for object lines in the embodiment of the present invention, in a first aspect, diffraction The angle of emergence for the diffraction light that optical device issues (is incident to diffraction when diffraction occurs on the diffraction grating for the light of diffraction grating Angle) preset angle angle value can be less than, it is totally reflected diffraction light not in the cover board of display panel and the interface of air.Second party The angle of emergence in face, the diffraction light that diffraction optical device issues can be greater than or equal to preset angle angle value, make diffraction light in display surface The cover board of plate and the interface of air are totally reflected, when diffraction light is totally reflected in the cover board of display panel and the interface of air When, compared in a first aspect, can be improved the clarity of the image of object to be identified, and then improve the accuracy of lines identification.

Wherein, preset angle angle value θ 1 described in first aspect and second aspect meets: θ 1=arcsin (n2*sin θ 2/ N1), n1 is the refractive index of light guide plate, and n2 is the refractive index of cover board, and θ 2 is incidence of the diffraction light on the interface of cover board and air Angle.The incidence angle θ 2 meets: 2 > arcsin (n3/n2) of θ, wherein n3 is the refractive index of air.

Assuming that object to be identified can increase second contact surface for fingerprint in order to further increase the clarity of fingerprint image The difference of the intensity of the light of reflection and the intensity of the light of the first interface reflection.Wherein, second contact surface refers to the lid of display panel The interface of plate and air (i.e. existing air between fingerprint valley and cover board), the first interface refers to the boundary of cover board and fingerprint ridge Face.In order to increase second contact surface reflection light intensity and the first interface reflection light intensity difference, diffraction light can be made The angle of emergence for learning the diffraction light that device issues is greater than or equal to preset angle angle value, makes diffraction light in the i.e. display panel of second contact surface The interface of cover board and air is totally reflected.

It is exemplary, the incidence of the light of diffraction grating can be incident to by the screen periods d and adjusting that diffraction grating is arranged AngleThe angle of emergence for the diffraction light for issuing diffraction optical device is greater than or equal to preset angle angle value.Fig. 8-1, which is shown, to be incident to The propagation path schematic diagram of the light of light guide plate 221.As shown in Fig. 8-1, in cover board 231 on the interface of directive cover board 231 and air The incidence angle of light be θ 2, the refractive index of cover board 231 is n2, and the refractive index of air is n3, and the refractive index of light guide plate 221 is n1, The refractive index of light refraction layer 2210 is n4, and the corresponding preset angle angle value of the angle of emergence for the diffraction light that diffraction optical device issues is θ 1, the incidence angle of the light in light refraction layer 2210 on the interface of directive light refraction layer 2210 and display panel 00 is ω, then as θ 2 Meet: when 2 > arcsin (n3/n2) of θ, the light in cover board 231 on the interface of directive cover board 231 and air can be all-trans It penetrates.Exemplary, the refractive index n2 of cover board 231 is 1.51, and the refractive index n3 of air is 1.0, then as 2 > arcsin (1/ of θ 1.51) it, that is to say, θ 2 is greater than 41.5 °, such as when being 50 °, the light in cover board 231 on the interface of directive cover board 231 and air It can be totally reflected.

In the related technology, it is assumed that light is from the interface of first medium directive first medium and second medium, the folding of first medium Penetrating rate is m1, and the refractive index of second medium is m2, and the incidence angle of light on the surface is ζ 1, and refraction angle is ζ 2, then then having: M1*sin ζ 1=m2*sin ζ 2, which is known as law of refraction formula.The law of refraction formula is corresponded into Fig. 8-1, then is had: N1*sin θ 1=n4*sin ω=n2*sin θ 2, so having: θ 1=arcsin (n2*sin θ 2/n1).It is exemplary, cover board 231 Refractive index n2 is 1.51, and the refractive index n1 of light guide plate 221 is 1.585, in cover board 231 on the interface of directive cover board 231 and air Light incidence angle θ 2 be 50 °, then preset angle angle value θ 1=arcsin (n2*sin θ 2/n1)=46.9, that is to say, diffraction light The corresponding predetermined angle of the angle of emergence for learning the diffraction light that device issues is 46.9 °.When the diffraction light that diffraction optical device issues When the angle of emergence is greater than or equal to 46.9 °, the light in cover board 231 on the interface of directive cover board 231 and air can be all-trans It penetrates.Assuming that being incident to the incidence angle of the light of diffraction gratingIt is 60 °, the angle of emergence for the diffraction light that diffraction optical device issues is 46.9 °, be incident to the light of diffraction grating wavelength X be 532 nanometers, then by(m is equal to+1) can To obtain: screen periods d=532/ (sin60 °-sin46.9 °) ≈ 3911 of diffraction grating that is to say, the grating of diffraction grating Period is 3911 nanometers.Therefore, if setting 3911 nanometers for the screen periods d of diffraction grating, and diffraction light will be incident to The incidence angle of the light of gridWhen being set as 60 °, can so that the angle of emergence for the diffraction light that diffraction optical device issues be equal to it is default Angle value i.e. 46.9 °, so that diffraction light is totally reflected in the cover board of display panel and the interface of air, to improve The clarity of fingerprint image.

Exemplary, Fig. 8-2 shows diffraction light when the cover board of display panel and the interface of air are totally reflected, optics The lower section of one end of display panel 00, photodetector array 23 are arranged in light source 21 by the course of work schematic diagram of component, Fig. 8-2 The non-displaying side of display panel 00 is set, for leaded light device 22 is arranged between photodetector array 23 and display panel 00 It is illustrated.Assuming that object to be identified is fingerprint, the course of work of the optical module can be with are as follows: light source 21 issues light, and convergence is saturating Mirror 241 converges the light that light source 21 issues for collimated light beam, and coupling grating 242 couples collimated light beam to the leaded light of leaded light device In plate 221.The light being incident in light guide plate 221 is totally reflected on interface of the light guide plate 221 with light refraction layer 2210, is occurred The light of total reflection generates the positive first-order diffraction light propagated to the display side of display panel, positive first-order diffraction by diffraction grating 021 The angle of emergence of light is greater than preset angle angle value.As shown in Fig. 8-3, positive first-order diffraction light is divided into two parts: the positive level-one of first part is spread out Penetrate light and the positive first-order diffraction light of second part.The positive first-order diffraction light of first part reaches display panel 00 by display panel 00 The interface of cover board 231 and air (i.e. existing air between fingerprint valley and cover board), the outgoing of the positive first-order diffraction light of first part Angle is greater than preset angle angle value, so the positive first-order diffraction light of first part is totally reflected on the interface of cover board 231 and air.It is false The intensity for being set to the positive first-order diffraction light of first part up on the interface of cover board 231 and air is q1, then by cover board 231 and sky The intensity of the light of the interface reflection of gas is also q1.The positive first-order diffraction light of second part reaches the interface of cover board 231 and fingerprint ridge, by It is close in the refractive index of cover board 231 with the refractive index of fingerprint ridge, so cover board 231 and fingerprint ridge are unsatisfactory for total reflection condition, The positive first-order diffraction light of the second part will not be totally reflected on the interface of cover board 231 and fingerprint ridge, the positive level-one of second part Most of light in diffraction light is understood directive and is leaked in fingerprint ridge.Assuming that reaching the on the interface of cover board 231 and fingerprint ridge The intensity of the positive first-order diffraction light in two parts is q2, if indicating the light reflected by the interface of cover board 231 and fingerprint ridge with q3 Intensity then has: q2 > q3 > 0.

Due to the intensity and the first interface (i.e. cover board and fingerprint of the light of second contact surface (i.e. the interface of cover board and air) reflection The interface of ridge) reflection light intensity difference it is bigger, so photogenerated that photodetector array is reflected according to second contact surface Optical signal and bigger according to the difference of the optical signal of the photogenerated of the first interface reflection, to enable a processor to based on optical detection The bigger optical signal of two species diversity that device array generates forms the higher fingerprint image of clarity.Other labels in Fig. 8-2 can To refer to Fig. 5-1.

So the angle of emergence for the diffraction light that diffraction optical device issues is greater than or equal to predetermined angle in second aspect Value, can be such that diffraction light is totally reflected in the cover board of display panel and the interface of air, and the reflectivity of diffraction light is 100%, The intensity of the light of the interface of cover board and air reflection is bigger, and so, photodetector array is according to the interface of cover board and air The optical signal of the photogenerated of reflection, and the difference of the optical signal of photogenerated reflected according to the interface of cover board and object to be identified is more Greatly, thus the bigger optical signal of two species diversity for enabling a processor to generate based on photodetector array to form clarity higher The image of object to be identified.

Further, it is based on the second aspect, the side of the angle of emergence for the diffraction light that control diffraction grating issues can be passed through Formula makes to pass through by the light of diffraction grating from the gap between multiple sub-pixels in display panel, display component is avoided to show Picture be affected.

Optical module provided in an embodiment of the present invention for object lines can be applied to the electronics with display panel Equipment, exemplary, which can be OLED display panel.Fig. 8-4 shows OLED display panel in the related technology Structural schematic diagram, the display panel include: array substrate 831, the encapsulation for playing covering and protective effect to array substrate 831 Layer 832 is successively set on polaroid 833, Optical transparent adhesive 834 and cover board of the encapsulated layer 832 far from 831 side of array substrate 231。

Optionally, the display panel shown in Fig. 8-4 can be set in the leaded light device for the optical module of object lines Cover board 231 lower section, i.e., between cover board and Optical transparent adhesive, or the lower section of polaroid 833 is set, i.e., polaroid and envelope It fills between layer.Optics group when Fig. 9-1 illustrates the lower section for the cover board 231 that display panel 00 is arranged in leaded light device 22 The structural schematic diagram of part, the optical module include light source 21, leaded light device and photodetector array 23.

The non-displaying side in display panel 00 can be set in photodetector array 23, and light source 21 can be set in display panel 00 one end, that is to say, light source 21 is located on the same floor with display panel 00.

Leaded light device may include light guide plate 221 and diffraction optical device, and diffraction optical device is arranged in light guide plate 221 On.Diffraction optical device may include multiple diffraction grating 021 of rectangular arrangement, by the light of each diffraction grating from display The gap between multiple sub-pixels in panel passes through.The two sides of light guide plate 221 are provided with light refraction layer 2210, light refraction layer 2210 refractive index is less than the refractive index of light guide plate 221.

It is exemplary, in order to improve object to be identified image clarity, diffraction optical device issue diffraction light go out Firing angle can be greater than or equal to preset angle angle value, be totally reflected diffraction light in the cover board of display panel and the interface of air.

Further, with reference to Fig. 5-1, which can also include: beam path alignment device, and beam path alignment device is arranged in light Between source and leaded light device.Beam path alignment device is for converging the light that light source issues and being coupled in leaded light device.Optical path Collimator may include plus lens and coupling grating.The focal position of plus lens is arranged in light source, and coupling grating setting exists Between plus lens and leaded light device.Plus lens is used to converge the light that light source issues as collimated light beam, coupling grating use It is coupled in leaded light device in by collimated light beam.

In addition, light source 21 can also be as shown in fig. 7, be arranged on the side wall of light guide plate 221, to simplify the knot of optical module Structure saves the setting up procedure of beam path alignment device.

Other labels in Fig. 9-1 can referring to figs. 2 and 5-1.

Optical module provided in an embodiment of the present invention for object lines, the light that leaded light device issues light source is in leaded light It is propagated in device, and directs the light to the display side of display panel, the area of leaded light device is greater than or equal to the area of display panel. Photodetector array in the display side of display panel there are the light for when object to be identified, receiving object to be identified reflection, and root It is used to indicate the optical signal of the image of the object to be identified according to the photogenerated of the object reflection to be identified received, realizes complete Screen identification.The use of leaded light device can also reduce the demand to quantity of light source simultaneously, thereby reduce the cost of display component. In addition, light source to be arranged in the lower section of one end of display panel, the thickness of optical module can be reduced, and then reduce electronic equipment Thickness, meet user to the use demand of electronic equipment.Further, by beam path alignment device photodetector array is connect The intensity of the light of the object to be identified reflection received is higher, improves the light utilization efficiency of light source, improves lines recognition accuracy.

It should be added that full frame fingerprint identification technology is the following fingerprint identification technology for mobile terminal Development trend, the target of full frame fingerprint identification technology is to complete fingerprint detection and knowledge in the arbitrary region of mobile terminal screen Not.Full frame fingerprint identification technology can be improved mobile terminal screen accounting (screen accounting refer to the area of mobile terminal screen with The ratio of the area of mobile terminal front panel), and preferable unlocked by fingerprint experience can be provided for user.Currently, full frame fingerprint The three big main problems that identification technology faces are: 1, in the case where fingerprint sensor and display component be integrated, mobile terminal Screen cannot be too thick；2, more visible finger is needed to form after stepped construction of the light of fingerprint reflection by mobile terminal screen complexity Print image；3, as shown in Fig. 9-2, fingerprint identification region is arranged when on mobile terminal screen, mobile terminal screen cannot be too It is thick.And the optical module provided in an embodiment of the present invention for object lines, it is directed to following full frame fingerprint identification technology, energy Enough so that the thickness of mobile terminal screen is smaller, the more visible fingerprint image for meeting fingerprint recognition demand can be obtained, so The optical module can be advantageously applied in following full frame fingerprint identification technology, adaptive technique development trend.

In conclusion the optical module provided in an embodiment of the present invention for object lines, since leaded light device can incite somebody to action The light that light source issues is propagated in leaded light device, and directs the light to the display side of display panel, and photodetector array is in display surface There are the light for when object to be identified, receiving the object reflection to be identified for the display side of plate, and according to the object to be identified received The photogenerated of body reflection is used to indicate the optical signal of the image of the object to be identified, and the area of leaded light device is greater than or equal to display The area of panel realizes full frame identification, improves user's body so any position of display panel can complete lines identification It tests, improves lines identification certainty.The use of leaded light device can also reduce the demand to quantity of light source simultaneously, and then reduce The cost of display component.In addition, light source to be arranged in the lower section of one end of display panel, the thickness of electronic equipment can be reduced Degree, meets user to the use demand of electronic equipment, further, also improves the light utilization efficiency of light source, improves lines knowledge Other accuracy.

The embodiment of the invention also provides a kind of display component, which can as shown in Figure 1, Figure 2, Fig. 5-1, Fig. 7, figure Shown in 8-2 or Fig. 9-1, including optical module shown in display panel and corresponding diagram.Wherein, display panel can be aobvious for OLED Show panel.

The embodiment of the invention also provides a kind of electronic equipment, the electronic equipment may include Fig. 1, Fig. 2, Fig. 5-1, Fig. 7, Display component and processor shown in Fig. 8-2 or Fig. 9-1 (such as CPU), the processor are used for the optical module according to display component Obtained optical signal forms the image of object to be identified.

It is exemplary, the electronic equipment can for smart phone, tablet computer, television set, display, laptop, can The products or components having a display function such as wearable device, Digital Frame, navigator.

In conclusion electronic equipment provided in an embodiment of the present invention, since the display component of the electronic equipment includes being used for The leaded light device of the optical module of object lines, the optical module can propagate the light that light source issues in leaded light device, and The display side of display panel is directed the light to, photodetector array, there are when object to be identified, is received in the display side of display panel The light of the object reflection to be identified, and the object to be identified is used to indicate according to the photogenerated of the object reflection to be identified received The optical signal of the image of body, and the area of leaded light device is greater than or equal to the area of display panel, so any of display panel Position can complete lines identification, realize full frame identification, improve user experience, improve lines identification certainty.Simultaneously The use of leaded light device can also reduce the demand to quantity of light source, thereby reduce the cost of electronic equipment.In addition, by light source The lower section of one end of display panel is set, the thickness of electronic equipment can be reduced, meets user to the use need of electronic equipment It asks, further, also improves the light utilization efficiency of light source, improve lines recognition accuracy.

The embodiment of the invention also provides a kind of manufacturing method of optical module for object lines, this method can be wrapped It includes:

It is respectively formed light source, leaded light device and photodetector array.

Wherein, light source is for issuing light.The light that leaded light device is used to that light source to be made to issue is propagated in leaded light device, and by light The display side of directed toward display panel, the area of leaded light device are greater than or equal to the area of display panel.Photodetector array is used for In the display side of display panel, there are the light for when object to be identified, receiving the object reflection to be identified, and should according to what is received The photogenerated of object reflection to be identified is used to indicate the optical signal of the image of the object to be identified.

By taking Fig. 1 as an example, it can be respectively formed light source 21, leaded light device 22 and photodetector array 23, then, by formation Leaded light device 22 and photodetector array 23 are sequentially formed at the non-displaying side of display panel, the light source 21 of formation are formed in aobvious Show the lower section of one end of panel.

Optionally, as shown in Fig. 2, leaded light device 22 may include light guide plate 221 and diffraction optical device 222, correspondingly, As shown in Figure 10-1, leaded light device is formed, comprising:

Step 1001 forms diffraction optical device on light guide plate.

As shown in figure 3, forming diffraction optical device 222 on light guide plate 221.

Optionally, display panel has multiple pixels of rectangular arrangement, and each pixel includes multiple sub-pixels, diffraction light Multiple diffraction grating that device may include rectangular arrangement are learned, correspondingly, as shown in Fig. 3 and Figure 10-2, step 1001 can be with Include:

Multiple diffraction grating 021 are formed on light guide plate 221, by the light of each diffraction grating from more in display panel Gap between a sub-pixel passes through, and the picture for avoiding display component from showing is affected.It optionally, can be by adjusting diffraction The mode of the position of grating, or the mode of the angle of emergence for the diffraction light that diffraction grating issues is controlled, make by each diffraction light The light of grid is passed through from the gap between multiple sub-pixels in display panel.

It is exemplary, multiple diffraction grating are formed on light guide plate, may include: by nano-imprint process on light guide plate Form multiple diffraction grating.

Exemplary, multiple diffraction grating are rectangular equidistant arrangement, and the spacing of arrangement can be micro- for 20 microns~400 Rice.The length of each diffraction grating 021 can be 5 microns~30 microns, and width can be 5 microns~30 microns.

Step 1002 forms light refraction layer in the two sides for the light guide plate for being formed with diffraction optical device.

As shown in Figure 10-2, light refraction layer is formed in the two sides for the light guide plate 221 for being formed with diffraction optical device 222 2210。

The refractive index of light refraction layer is less than the refractive index of light guide plate, and diffraction optical device is used for the light that will be propagated in light guide plate The display side of directed toward display panel.

The forming position of light source, leaded light device and photodetector array that the optical module includes can there are many, such as With reference to Fig. 2, Fig. 5-1, Fig. 7, Fig. 8-2 or Fig. 9, forming photodetector array may include: the non-displaying side in display panel 00 Form photodetector array 23.It is exemplary, 500 optical detections can be correspondingly formed in the non-displaying side per inch of display panel Device.Photodetector array covers entire display panel.

For example Fig. 1, Fig. 2, Fig. 5-1, Fig. 7 or Fig. 8-2 is referred to, forming leaded light device may include:

Leaded light device 22 is formed close to the side of photodetector array 23 in display panel 00, leaded light device 22 is located at light spy It surveys between device array 23 and display panel 00.

Referring to Fig. 8-4, display panel includes cover board 231 and polaroid 833, so Fig. 9-1 can also be referred to, in display surface Plate 00 forms leaded light device 22 far from the side of photodetector array 23, and leaded light device 22 is located at the cover board 231 of display panel 00 Lower section.

Leaded light device 22 in Fig. 9-1 can also be located at the lower section of the polaroid of display panel.

For example Fig. 1, Fig. 2, Fig. 5-1 or Fig. 8-2 are referred to, forming light source may include: under one end of display panel 00 It is rectangular at light source 21 so that the outermost edge of light source is located at outside the outermost edge of upright projection of display panel.By light Source is formed in the lower section of one end of display panel, can reduce the thickness of optical module, reduces the display group including optical module The thickness of part, and then the thickness of the electronic equipment including display component is reduced, meet user to the use demand of electronic equipment.

It is exemplary, Fig. 7 can also be referred to, forms light source 21, light source 21 and leaded light device 22 on the side wall of lightguide 22 It is located on the same floor, simplifies the manufacturing process of optical module shown in Fig. 5-1.

It is exemplary, Fig. 9-1 can also be referred to, forms light source 21, light source 21 and display panel in one end of display panel 00 00 is located on the same floor.

Further, as shown in fig. 5-1, optical module can also include: beam path alignment device 24, correspondingly, in display surface The lower section of one end of plate is formed after light source, and this method can also include:

Beam path alignment device 24 is formed between light source 21 and leaded light device 22, which is used to send out light source 21 Light out is converged and is coupled in leaded light device 22.The light that light source issues is coupled to leaded light device by beam path alignment device Interior, the more light for enabling leaded light device to issue light source are propagated in leaded light device, and direct the light to display panel It shows side, so that the intensity of the light for the object to be identified reflection for receiving photodetector array is higher, improves the light of light source Utilization rate, and then improve lines recognition accuracy.

Optionally, as shown in fig. 5-1, beam path alignment device 24 includes plus lens 241 and coupling grating 242, correspondingly, Beam path alignment device is formed between light source and leaded light device, comprising:

Plus lens 241 is formed between light source 21 and leaded light device 22, and light source 21 is made to be located at the focal length of plus lens 241 Position.

Coupling grating 242 is formed between plus lens 241 and leaded light device 22.

Wherein, plus lens 241 is used to converge the light that light source 21 issues for collimated light beam, and coupling grating 242 is for general Collimated light beam is coupled in leaded light device 22.It is exemplary, nano-imprint process can be used in light guide plate far from display panel Side forms coupling grating.

Exemplary, light source may include multiple sub-light sources, and plus lens may include multiple sub-lens, multiple sub-light sources with The multiple sub-lens correspond.Exemplary, sub-lens can be lenticule, cylindrical lens or collimator, and collimator includes fast Axis collimator and slow axis collimator.

In conclusion the manufacturing method of the optical module provided in an embodiment of the present invention for object lines, formation are led Optical device can propagate the light that light source issues in leaded light device, and direct the light to the display side of display panel, optical detector There are the light for when object to be identified, receiving object to be identified reflection in the display side of display panel for array, and according to receiving Object to be identified reflection photogenerated be used to indicate the object to be identified image optical signal, due to the face of leaded light device Product is greater than or equal to the area of display panel, so any position of display panel can complete lines identification, realizes full frame Identification, improves user experience, improves identification lines reliability.Being formed simultaneously leaded light device can also reduce to quantity of light source Demand, thereby reduce the cost of display component.In addition, light source to be formed in the lower section of one end of display panel, can drop The thickness of low electronic equipment meets user to the use demand of electronic equipment, and further, the beam path alignment device of formation also improves The light utilization efficiency of light source, improves lines recognition accuracy.

It is apparent to those skilled in the art that for convenience and simplicity of description, the method for foregoing description Specific steps, can be with reference to the corresponding process in aforementioned device embodiment, details are not described herein.

The foregoing is merely the alternative embodiments of the application, not to limit the application, it is all in spirit herein and Within principle, any modification, equivalent replacement, improvement and so on be should be included within the scope of protection of this application.

Claims

1. a kind of optical module for object lines, which is characterized in that applied to the electronic equipment with display panel, packet It includes: light source, leaded light device and photodetector array,

The light source is for issuing light；

The light that the leaded light device is used to that the light source to be made to issue is propagated in the leaded light device, and directs the light to the display The display side of panel, wherein the area of the leaded light device is greater than or equal to the area of the display panel；

The photodetector array is used to receive described to be identified in the display side of the display panel there are when object to be identified The light of object reflection, and the object to be identified is used to indicate according to the photogenerated of the object reflection to be identified received The optical signal of image.

2. optical module according to claim 1, which is characterized in that the leaded light device includes light guide plate and diffraction optics Device, the diffraction optical device are arranged on the light guide plate,

The two sides of the light guide plate are provided with light refraction layer, and the refractive index of the light refraction layer is less than the refraction of the light guide plate Rate；

The display side of display panel described in the light directing that the diffraction optical device is used to propagate in the light guide plate.

3. optical module according to claim 2, which is characterized in that the display panel has the multiple of rectangular arrangement Pixel, each pixel include multiple sub-pixels, and the diffraction optical device includes multiple diffraction grating of rectangular arrangement,

It is passed through by the light of each diffraction grating from the gap between multiple sub-pixels in the display panel.

4. optical module according to claim 2 or 3, which is characterized in that

The angle of emergence for the diffraction light that the diffraction optical device issues is less than preset angle angle value, makes the diffraction light in the display The cover board of panel and the interface of air are not totally reflected.

5. optical module according to claim 2 or 3, which is characterized in that

The angle of emergence for the diffraction light that the diffraction optical device issues is greater than or equal to preset angle angle value, makes the diffraction light in institute The interface of the cover board and air of stating display panel is totally reflected.

6. optical module according to claim 4 or 5, which is characterized in that

The preset angle angle value θ 1 meets: θ 1=arcsin (n2*sin θ 2/n1), the n1 are the refractive index of the light guide plate, The n2 is the refractive index of the cover board, and the θ 2 is incidence angle of the diffraction light on the interface of the cover board and air, The θ 2 meets: θ 2 > arcsin (n3/n2), the n3 are the refractive index of air.

7. optical module according to any one of claims 1 to 6, which is characterized in that

The non-displaying side of the display panel is arranged in the photodetector array.

8. optical module according to claim 7, which is characterized in that the display panel includes cover board and polaroid,

The leaded light device is arranged between the photodetector array and the display panel,

Alternatively, the cover board of the display panel or the lower section of polaroid is arranged in the leaded light device.

9. optical module according to any one of claims 1 to 8, which is characterized in that

The lower section of one end of the display panel is arranged in the light source.

10. optical module according to any one of claims 1 to 9, which is characterized in that the optical module further include: optical path Collimator, the beam path alignment device are arranged between the light source and the leaded light device,

The beam path alignment device is for converging the light that the light source issues and being coupled in the leaded light device.

11. optical module according to claim 10, which is characterized in that the beam path alignment device includes plus lens and coupling Light combination grid, the light source are arranged in the focal position of the plus lens, the coupling grating setting in the plus lens and Between the leaded light device,

The plus lens is for converging the light that the light source issues for collimated light beam；

The coupling grating is for coupling the collimated light beam in the leaded light device.

12. optical module according to claim 11, which is characterized in that the light source includes multiple sub-light sources, the remittance Poly- lens include multiple sub-lens, and the multiple sub-light source and the multiple sub-lens correspond.

13. optical module according to claim 12, which is characterized in that

The sub-lens are lenticule, cylindrical lens or collimator, and the collimator includes fast axis collimation device and slow axis collimator.

14. optical module according to claim 3, which is characterized in that the multiple diffraction grating is rectangular equidistant Arrangement, and the spacing arranged is 20 microns~400 microns.

15. optical module according to claim 3, which is characterized in that

The length of each diffraction grating is 5 microns~30 microns, and width is 5 microns~30 microns.

16. optical module according to claim 2, which is characterized in that

The light guide plate is by polycarbonate, polymetylmethacrylate, polydimethylsiloxane or glass material It is made.

17. optical module according to claim 2, which is characterized in that the light refraction layer is formed by air or optical cement.

18. a kind of display component, which is characterized in that including any optical module of display panel and claim 1 to 17.

19. display component according to claim 18, which is characterized in that the display panel is Organic Light Emitting Diode OLED display panel.

20. a kind of electronic equipment, which is characterized in that including display component and processor described in claim 18 or 19,

The processor is used to be formed the image of object to be identified according to the optical signal that the optical module of the display component obtains.