CN111061090A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN111061090A CN111061090A CN201911293702.2A CN201911293702A CN111061090A CN 111061090 A CN111061090 A CN 111061090A CN 201911293702 A CN201911293702 A CN 201911293702A CN 111061090 A CN111061090 A CN 111061090A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The invention discloses a backlight module and a display device, belonging to the technical field of display, wherein the backlight module comprises a substrate, a plurality of mini LED lamp beads arranged on one side of the substrate, and a plurality of fingerprint identification elements, wherein the plurality of fingerprint identification elements are fixedly arranged on one side of the substrate, which is far away from the mini LED lamp beads; the plurality of fingerprint identification elements comprise a plurality of infrared emission units and a plurality of fingerprint detection units, and the infrared emission units and the fingerprint detection units are arranged at the positions of the through holes; the infrared emission unit sets up in first through-hole position department, and the fingerprint detection unit sets up in second through-hole position department. The display device comprises a display panel and the backlight module which are oppositely arranged. The invention can reduce the signal attenuation of the infrared signal sent and received by the fingerprint identification element in the film layer structure of the backlight module to the minimum, can also avoid the obvious influence of the setting of the fingerprint identification element on the overall brightness and the taste of the backlight module, and is beneficial to improving the fingerprint identification effect.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the development of multimedia technology, more and more intelligent portable electronic devices such as mobile phones, personal notebook computers, tablet computers and the like have become necessary tools in people's lives. These portable electronic devices usually include personal information of a large number of users, such as phone books, photos, etc., and in order to ensure the personal information of the users, the identity or authority of the users is usually verified. At present, the authentication method for the user identity or authority generally includes face recognition, fingerprint recognition, password input and the like. Because fingerprint identification is simple and fast, most of the existing electronic devices adopt a fingerprint identification mode to verify identity or authority.
Among the display device that prior art provided, need additionally to increase the fingerprint identification module in order to realize the fingerprint identification function, after making respectively and accomplish display panel and fingerprint identification module, assemble the two in order to realize the electricity and connect, consequently increased display device's technology processing procedure to the fingerprint identification module probably occupies certain region in display device, is unfavorable for realizing the full face screen. With the rise of the full screen technology, fingerprint identification is gradually developed from the design outside the display screen to the design inside the display screen, namely, the fingerprint identification technology under the screen is pursued to obtain higher screen occupation ratio. Specifically, integrate a plurality of fingerprint identification components and parts in display panel's display area, form fingerprint identification components and parts array, then set up drive circuit through the frame district at display panel, realize the drive of fingerprint identification components and parts array, accomplish fingerprint identification.
The mainstream fingerprint identification technology at present comprises photoelectric fingerprint identification, capacitance type fingerprint identification and ultrasonic fingerprint identification. Capacitive fingerprinting analyzes a touch object through a commonly used capacitive sensor, and full-screen fingerprinting is difficult to achieve. Photoelectric fingerprint identification includes a plurality of luminescence units and a plurality of fingerprint sensing unit, and fingerprint sensing unit can carry out the discernment of fingerprint according to the light that the light source sent forms after the reflection of touch main part, and through the reflectivity difference of fingerprint line valley and line ridge, the fingerprint sensing unit is realized receiving different fingerprint information differentiation, forms the fingerprint image.
However, most of all-screen mobile phones employ an OLED (Organic Light-emitting diode) screen, and by utilizing the self-luminous property of the OLED, Light rays penetrate through a glass cover plate and then reflect after encountering a finger fingerprint, and are received and identified by a receiving and identifying module below the screen. However, since an LCD (Liquid Crystal Display) cannot actively emit light, a backlight structure is required, light cannot penetrate through the backlight structure, and a fingerprint identification module below a screen cannot receive an effective signal reflected by a finger fingerprint, but the cost of an OLED screen is high, so how to realize an under-screen fingerprint identification function on an LCD screen with low cost is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a backlight module and a display device to solve the problem in the prior art that when a low-cost LCD screen is used to implement a fingerprint identification function under the screen, the fingerprint identification effect is poor.
The invention provides a backlight module, comprising: a substrate base plate; the mini LED lamp beads are arranged in an array mode and fixedly arranged on one side of the substrate; the fingerprint identification elements are fixedly arranged on one side, far away from the mini LED lamp bead, of the substrate base plate; along the direction parallel to the light-emitting surface of the backlight module, through holes are formed in the substrate at the positions of at least part of adjacent mini LED lamp beads, and the through holes penetrate through the substrate along the direction vertical to the light-emitting surface of the backlight module; the plurality of fingerprint identification elements comprise a plurality of infrared emission units and a plurality of fingerprint detection units, and the infrared emission units and the fingerprint detection units are arranged at the positions of the through holes; the infrared emission unit is arranged at the position of the first through hole, and the fingerprint detection unit is arranged at the position of the second through hole; the orthographic projection of the first through hole to the light-emitting surface of the backlight module is located in the orthographic projection range of the infrared emission unit to the light-emitting surface of the backlight module, and the orthographic projection of the second through hole to the light-emitting surface of the backlight module is located in the orthographic projection range of the fingerprint detection unit to the light-emitting surface of the backlight module.
Based on the same inventive concept, the invention also provides a display device, which comprises a display panel and the backlight module, wherein the display panel and the backlight module are oppositely arranged, and the display panel is positioned on one side of the light-emitting surface of the backlight module.
Compared with the prior art, the backlight module and the display device provided by the invention at least realize the following beneficial effects:
the backlight module provided by the invention adopts the direct type backlight module manufactured by the mini LED lamp beads arranged in the array, has more dynamic partitions, higher dimming response speed and higher control precision, and can greatly improve the backlight response speed of the dynamic partitions and the brightness of each partition. According to the invention, a plurality of fingerprint identification elements are further arranged on one side, away from the mini LED lamp bead, of the substrate base plate, wherein each fingerprint identification element comprises an infrared emission unit and a fingerprint detection unit. Because the orthographic projection of the first through hole formed on the substrate towards the light-emitting surface of the backlight module is positioned in the orthographic projection range of the infrared emission unit towards the light-emitting surface of the backlight module, the orthographic projection of the second through hole formed on the substrate towards the light-emitting surface of the backlight module is positioned in the orthographic projection range of the fingerprint detection unit towards the light-emitting surface of the backlight module, the infrared emission unit is equivalent to an infrared emission light source and is used for emitting infrared light for fingerprint detection, and is emitted to the surface of the finger through a plurality of first through holes arranged on the substrate base plate, and after being reflected back through the valleys and ridges of the finger fingerprint, and is identified by the fingerprint detection unit at the position of the second through hole through a plurality of second through holes arranged on the substrate, because the reflected infrared light signals of the valleys and ridges of the fingerprint are different, the fingerprint detection unit can receive different fingerprint information, and finally forms a fingerprint image. The min LED backlight module does not need more optical films as the traditional backlight source, so that the signal attenuation of infrared signals sent and received by the fingerprint identification element in the film layer structure of the backlight module can be reduced to the minimum (the more materials are penetrated by the infrared signals, the more the signal loss is). A plurality of fingerprint identification components are fixed to be set up in the one side that mini LED lamp pearl was kept away from to the substrate base plate, because infrared emission unit and fingerprint detecting unit take the colour usually (or the material itself is dark), consequently all set up infrared emission unit and fingerprint detecting unit in the one side that the mini LED lamp pearl was kept away from to the substrate base plate, the light that can avoid mini LED lamp pearl to send is absorbed, perhaps block the normal propagation of light, thereby it has obvious influence to backlight unit whole luminance and taste to avoid setting up of fingerprint identification component. In addition, according to the invention, one infrared emission unit is correspondingly arranged on one first through hole, and one fingerprint detection unit is correspondingly arranged on one second through hole, so that the first through hole at each infrared emission unit is large enough, the emitted infrared light is emitted from the infrared emission unit through a sufficient hole, the second through hole at each fingerprint detection unit is large enough, the infrared light reflected by the finger can completely pass through the second through hole as far as possible, the detection signal obtained by the fingerprint detection unit is strong enough, the fingerprint detection signal can be conveniently received and emitted, and the fingerprint identification effect can be favorably improved.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A' of FIG. 1;
FIG. 3 is a schematic plan view of another backlight module according to an embodiment of the present invention;
FIG. 4 is a schematic plan view of another backlight module according to an embodiment of the present invention;
FIG. 5 is a schematic plan view of another backlight module according to an embodiment of the present invention;
fig. 6 is a schematic plan view illustrating a backlight module according to an embodiment of the present invention;
FIG. 7 is a schematic sectional view taken along line B-B' of FIG. 6;
FIG. 8 is a schematic view of an alternative cross-sectional configuration taken along line B-B' of FIG. 6;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view taken along line C-C' of FIG. 9;
fig. 11 is a schematic plan view of another display device according to an embodiment of the present invention;
fig. 12 is a schematic plan view of another display device provided in an embodiment of the present invention;
fig. 13 is a schematic plan view of another display device according to an embodiment of the present invention;
fig. 14 is a schematic plan view of another display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present invention, fig. 2 is a schematic sectional view along a direction a-a' in fig. 1, and a backlight module 000 according to an embodiment of the present invention includes: a base substrate 10 (unfilled in fig. 1);
the mini LED lamp beads 20 are arranged in an array mode, and the mini LED lamp beads 20 are fixedly arranged on one side of the substrate base plate 10;
the fingerprint identification elements 30 are fixedly arranged on one side, far away from the mini LED lamp bead 20, of the substrate base plate 10; for clarity of illustration of the fingerprint identification element 30, the fingerprint identification element 30 is filled with transparency in fig. 1 to illustrate that it is located on the side of the substrate 10 away from the mini LED lamp bead 20;
along the direction parallel to the light-emitting surface E of the backlight module 000, through holes 101 are formed in the substrate base plate 10 at least in part of the positions of the adjacent mini LED beads, and the through holes 101 penetrate through the substrate base plate 10 along the direction Z perpendicular to the light-emitting surface E of the backlight module 000; in order to clearly illustrate the structure of the through hole 101 of the present embodiment, fig. 1 is a filling arrangement of the through hole 101, and in the cross-sectional view of fig. 2, the through hole 101 is not filled, but the substrate base 10 is filled;
the plurality of fingerprint identification elements 30 comprise a plurality of infrared emission units 301 and a plurality of fingerprint detection units 302, and the infrared emission units 301 and the fingerprint detection units 302 are arranged at the positions of the through holes 101;
along the direction parallel to the light-emitting surface E of the backlight module 000, the plurality of through holes 101 include first through holes 1011 and second through holes 1012 arranged alternately, the infrared emission unit 301 is arranged at the position of the first through holes 1011, and the fingerprint detection unit 302 is arranged at the position of the second through holes 1012;
the orthographic projection of the first through hole 1011 to the light-emitting surface E of the backlight module 000 is within the range of the orthographic projection of the infrared emission unit 301 to the light-emitting surface E of the backlight module 000, and the orthographic projection of the second through hole 1012 to the light-emitting surface E of the backlight module 000 is within the range of the orthographic projection of the fingerprint detection unit 302 to the light-emitting surface E of the backlight module 000.
Specifically, backlight unit 000 of this embodiment is straight following formula backlight unit, this straight following formula backlight unit includes substrate base plate 10 and the mini LED lamp pearl 20 that a plurality of arrays that set up in substrate base plate 10 one side were arranged fixedly at least, mini LED lamp pearl 20 is also named as time millimeter emitting diode, indicate the LED that the crystalline grain size is about more than 100 microns, in the technological principle, straight following formula backlight unit dynamic partition that the mini LED lamp pearl 20 that adopts a plurality of arrays to arrange was made is many, the response speed of adjusting luminance is faster, control accuracy is higher, can promote dynamic partition speed and each subregion luminance of being shaded to a large extent, because straight following formula backlight unit that mini LED lamp pearl 20 was made need the light guide plate unlike traditional backlight, the reflectance coating, optical film such as prism membrane, consequently, can reduce backlight unit's thickness.
In this embodiment, the substrate 10 is further provided with a plurality of fingerprint identification elements 30 on a side away from the mini LED lamp bead 20, wherein the fingerprint identification elements 30 include an infrared emission unit 301 and a fingerprint detection unit 302. Because the orthographic projection of the first through hole 1011 formed on the substrate 10 to the light-emitting surface E of the backlight module 000 is located in the orthographic projection range of the infrared emission unit 301 to the light-emitting surface E of the backlight module 000, the orthographic projection of the second through hole 1012 formed on the substrate 10 to the light-emitting surface E of the backlight module 000 is located in the orthographic projection range of the fingerprint detection unit 302 to the light-emitting surface E of the backlight module 000, and the infrared emission unit 301 is equivalent to an infrared emission light source and is used for emitting infrared light M for fingerprint detection and is emitted to the surface of a finger through the plurality of first through holes 1011 formed on the substrate 10, after being reflected back by the valleys and ridges of the fingerprint of the finger, the infrared emission unit 302 is identified by the fingerprint detection unit 302 at the position of the second through the plurality of second through holes 1012 formed on the substrate 10, and because the reflected infrared light signals of the valleys and the ridges of the fingerprint are different, the fingerprint detection unit 302 can receive different, finally, a fingerprint image is formed. The min LED backlight module of this embodiment does not require more optical films than the conventional backlight source, so that the signal attenuation of the infrared signal transmitted and received by the fingerprint identification device 30 in the film structure of the backlight module 000 can be minimized (the more the infrared signal passes through, the more the signal loss). A plurality of fingerprint identification component 30 are fixed to be set up in substrate base plate 10 and keep away from one side of mini LED lamp pearl 20, because infrared emission unit 301 and fingerprint detection unit 302 are the area colour usually (or the material itself is dark), this embodiment all sets up infrared emission unit 301 and fingerprint detection unit 302 in substrate base plate 10 and keeps away from one side of mini LED lamp pearl 20, the light that can avoid mini LED lamp pearl 20 to send is absorbed, or block the normal propagation of light, the at utmost reduces the material that substrate base plate 10 is close to 2 one sides of mini LED lamp pearl and to the influence of infrared signal transmission, thereby avoid setting up of fingerprint identification component 30 to have obvious influence to backlight unit 000 whole luminance and taste.
Moreover, a first through hole 1011 of the embodiment is correspondingly provided with an infrared emission unit 301, and a second through hole 1012 is correspondingly provided with a fingerprint detection unit 302, so that the hole of the first through hole 1011 at each infrared emission unit 301 is large enough, the emitted infrared light is emitted out through enough holes, the hole of the second through hole 1012 at each fingerprint detection unit 302 is also large enough, the infrared light reflected by the finger can be enabled to completely pass through as much as possible, the detection signal obtained by the fingerprint detection unit 302 is strong enough, the fingerprint detection signal can be conveniently received and emitted, and the fingerprint identification effect can be favorably improved. Optionally, the through holes 101 of this embodiment may be uniformly formed on the substrate 10, so that the fingerprint identification elements 30 may be uniformly distributed, and the process is simplified and the fingerprint detection function may be uniformly distributed on the backlight module 000. The mini LED backlight technology is adopted in being shaded of this embodiment, and the quantity of mini LED lamp pearl 20 that uses along with the maturity of technique is less and less, and the backlight unit of equidimension, after mini LED lamp pearl 20 and the flexible circuit board who provides the signal of telecommunication for this mini LED lamp pearl 20 bind, the space between adjacent mini LED lamp pearl 20 also corresponding increase to provide the advantage for the setting of through-hole 101.
It should be noted that, in this embodiment, the size and shape of the aperture of the through hole 101 are not specifically limited, and only the requirement that the aperture is smaller than the gap between adjacent mini LED lamp beads 20 is satisfied, and the wiring of the flexible circuit board (not shown) that is electrically connected with the mini LED lamp beads 20 and provides an electrical signal for the mini LED lamp beads 20 is not interfered. It should be further noted that fig. 1 of the embodiment only schematically shows the number of the mini LED lamp beads 20 and the fingerprint identification elements 30 in the backlight module 000, in practical implementation, the number of the mini LED lamp beads 20 and the fingerprint identification elements 30 is not limited thereto, and generally includes more, and can be set according to practical requirements, and the embodiment is not particularly limited. It is understood that the backlight module 000 is not limited to the film structure shown in fig. 2, and may also include other film structures (not filled in fig. 2) of the direct-type mini LED backlight, such as a diffusion film located on the light emitting surface side of the backlight module 000 when the backlight module 000 is aligned and attached to the display panel, which can be understood according to the structure of the mini LED backlight in the prior art, and the description of this embodiment is omitted.
Optionally, please refer to fig. 1, fig. 3 and fig. 4 in combination, where fig. 3 is a schematic plane structure diagram of another backlight module 000 provided in the embodiment of the present invention, and fig. 4 is a schematic plane structure diagram of another backlight module 000 provided in the embodiment of the present invention, in this embodiment, through holes 101 are formed in the substrate 10 at least at a portion of the positions of the adjacent mini LED lamp beads along the first direction X, and the first through holes 1011 and the second through holes 1012 are alternately arranged along the first direction X (as shown in fig. 1); or, along the second direction Y, at least part of the substrate base plate 10 at the position of the adjacent mini LED lamp bead 20 is also provided with through holes 101, and along the second direction Y, the first through holes 1011 and the second through holes 1012 are alternately arranged (as shown in fig. 3); or, through holes 101 are formed in the substrate base plate 10 at the positions of the adjacent mini LED lamp beads 20 along the first direction X and the second direction Y, the first through holes 1011 and the second through holes 1012 are alternately arranged along the first direction X, and the first through holes 1011 and the second through holes 1012 are also alternately arranged along the second direction Y (as shown in fig. 4); thereby can make full use of the clearance between the adjacent mini LED lamp pearl set up through-hole 101 for keep away from mini LED lamp pearl 20 one side at substrate base plate 10 and set up more fingerprint identification component 30, strengthen signal intensity, be favorable to further promoting the display device's that adopts this backlight unit 000 fingerprint detection effect.
Further optionally, please refer to fig. 4 and 5 in combination, fig. 5 is a schematic plan structure diagram of another backlight module 000 provided in the embodiment of the present invention, in the embodiment, through holes 101 (as shown in fig. 4) may be formed in the substrate 10 at positions of adjacent mini LED beads 20 in the whole area of the backlight module 000; through holes 101 (as shown in fig. 5) can be further formed in the substrate base plate 10 at the positions of the adjacent mini LED beads in the local area C of the backlight module 000, so that the fingerprint identification element 30 can be locally or fully integrated, a local or full-screen fingerprint identification function is realized, and the use is flexible and convenient.
In some alternative embodiments, please continue to refer to fig. 1-5, in this embodiment, the fingerprint detection unit 302 includes any one of an infrared sensor or an infrared sensing film.
The present embodiment further explains that the fingerprint detection unit 302 for receiving the infrared light detection signal reflected from the valley and ridge of the finger fingerprint may be an infrared sensor attached to the side of the substrate 10 away from the mini LED lamp bead 20, an infrared sensing film capable of sensing the fingerprint infrared signal and recording and transmitting fingerprint information, or a film capable of implementing similar functions, and this embodiment is not limited specifically.
In some optional embodiments, please refer to fig. 6 and 7, fig. 6 is a schematic plane structure diagram of a backlight module according to an embodiment of the present invention, fig. 7 is a schematic cross-sectional structure diagram along the direction B-B' in fig. 6, in the embodiment, the number of infrared emission units 301 is greater than the number of fingerprint detection units 302 in the plurality of fingerprint identification elements 30.
This embodiment further explains in the fingerprint identification component 30 that backlight unit 000 set up, can set up the quantity of infrared emission unit 301 to be greater than the quantity of fingerprint detection unit 302 to make the infrared light of the fingerprint detection usefulness of infrared emission unit 301 transmission enough, the fingerprint detection signal after the valley and the ridge reflection of finger fingerprint is enough strong, further promotes the identification effect of fingerprint identification component 30. Optionally, as shown in fig. 6 and 7, a fingerprint detection unit 302 and two infrared emission units 301 may be a fingerprint identification element group along the first direction X, so that after infrared light for fingerprint detection emitted by two infrared emission units 301 located at two sides of one fingerprint detection unit 302 is reflected by a finger, fingerprint signals can be detected by the fingerprint detection unit 302 therebetween, and further fingerprint identification effect is improved.
It should be understood that fig. 6 and 7 of this embodiment are only an implementation manner for illustrating that the number of the infrared emission units 301 is greater than the number of the fingerprint detection units 302, but not limited to this layout structure, and in a specific implementation, the arrangement may be performed according to actual requirements, and it is only necessary to satisfy that the number of the infrared emission units 301 is greater than the number of the fingerprint detection units 302, and this embodiment is not limited.
In some optional embodiments, please refer to fig. 6 and fig. 7, in this embodiment, the backlight module 000 further includes a fluorescent glue 40 and a diffusion film 50, the fluorescent glue 40 is located on a side of the mini LED bead 20 away from the substrate 10, and the diffusion film 50 is located on a side of the fluorescent glue 40 away from the substrate 10.
The embodiment further explains that the backlight module 000 can further include a fluorescent glue 40 filled on one side of the mini LED lamp beads 20 far away from the substrate 10 and a diffusion film 50 attached on one side of the fluorescent glue 40 far away from the substrate 10, wherein the fluorescent glue 40 is used for coating and packaging each mini LED lamp bead 20 on the substrate 10, so that the fixing effect of the mini LED lamp beads 20 is enhanced, and a support plane is provided for the attachment of the diffusion film 50; the diffusion film 50 generally uses PMMA (Polymethyl methacrylate) diffusion particles to make light irregularly refracted, so that the light emitted from the mini LED lamp bead 20 is uniform, and then the uniform light is transmitted to the display panel attached to the backlight module 000 in a position opposite to the backlight module 000, thereby facilitating improvement of display quality.
In some optional embodiments, please continue to refer to fig. 6 and 7, in this embodiment, along a direction parallel to the light emitting surface E of the backlight module 000, a length of a gap between two adjacent mini LED beads 20 is L1, and an outer diameter of the through hole 101 is L2, where L2 is less than L1.
The embodiment further explains that the gap length L1 between two adjacent mini LED lamp beads 20 is greater than the outer diameter L2 of the through hole 101, so that the arrangement interference of the through hole 101 can be avoided, the mini LED lamp beads 20 are electrically connected, and the wiring of the flexible circuit board for providing electric signals for the mini LED lamp beads 20 is facilitated, and the improvement of the product yield is facilitated.
In some alternative embodiments, please refer to fig. 6 and 8 in combination, fig. 8 is another schematic cross-sectional structure diagram along the direction B-B' in fig. 6, in which in the present embodiment, the infrared emission unit 301 and the fingerprint detection unit 302 are located on the same plane F parallel to the light-emitting surface of the backlight module.
The present embodiment further explains that the surface of the side of the infrared emission unit 301 away from the substrate base plate 10 is flush with the surface of the side of the fingerprint detection unit 302 away from the substrate base plate 10, and the infrared emission unit 301 and the fingerprint detection unit 302 are located on the same plane F parallel to the light emitting surface of the backlight module, thereby being beneficial to reducing the thickness of the whole backlight module 000 and realizing the thinning of the module.
In some optional embodiments, please refer to fig. 9 and 10, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, fig. 10 is a schematic structural diagram of a cross section along direction C-C' in fig. 9, a display device 1111 provided in this embodiment includes a display panel 111 and a backlight module 000 provided in the above embodiment, the display panel 111 is located on one side of a light emitting surface E of the backlight module 000, optionally, the display panel 111 is a liquid crystal display panel, and the display device 1111 may further include a cover plate 001 located on one side of the display panel 111 away from the backlight module 000. The display device 1111 is described only by taking a mobile phone as an example in the embodiment of fig. 9, but it should be understood that the display device 1111 provided in the embodiment of the present invention may be other display devices 1111 having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device 1111 provided in the embodiment of the present invention has the beneficial effects of the backlight module 000 provided in the embodiment of the present invention, and specific descriptions of the backlight module 000 in the above embodiments may be specifically referred to, and no further description is provided in this embodiment.
In some optional embodiments, please refer to fig. 1 and fig. 11 in combination, fig. 11 is a schematic plan structure diagram of another display device provided in the embodiments of the present invention, in which the display device 1111 further includes a first driving circuit 60, a second driving circuit 70, and a third driving circuit 80, the first driving circuit 60 is electrically connected to the display panel 111, the second driving circuit 70 is electrically connected to the miniLED lamp bead 20, and the third driving circuit 80 is electrically connected to the fingerprint identification element 30.
The embodiment further explains that the display device 1111 may further include a first driving circuit 60, a second driving circuit 70, and a third driving circuit 80, wherein the first driving circuit 60 is electrically connected to the display panel 111 and is configured to provide a display driving signal to the display panel 111 to implement the display function of the display panel 111. The second driving circuit 70 is electrically connected with the mini LED lamp bead 20, and is configured to provide a voltage signal for the mini LED lamp bead 20 of the backlight module 000, so that the mini LED lamp bead 20 emits light. The third driving circuit 80 is electrically connected to the fingerprint identification element 30, and is configured to provide an electrical signal to the fingerprint identification element 30, so as to implement a fingerprint identification detection function. The first driving circuit 60, the second driving circuit 70, and the third driving circuit 80 may be disposed in a non-display region of the display device 1111, so as to avoid affecting an aperture ratio of the display device.
In some optional embodiments, please refer to fig. 1 and 12 in combination, fig. 12 is a schematic plan view illustrating another display device according to an embodiment of the present invention, in which the display device further includes a driver chip IC (not filled in fig. 12), and the first driver circuit 60, the second driver circuit 70, and the third driver circuit 80 are all integrated on the driver chip IC.
The present embodiment further explains that the first driving circuit 60, the second driving circuit 70, and the third driving circuit 80 may all be integrated on the driving chip IC, so as to further reduce the frame area of the display device 1111, which is beneficial to realizing the narrow frame of the display device 1111.
In some optional embodiments, please refer to fig. 13 and 14, fig. 13 is a schematic plane structure diagram of another display device provided in an embodiment of the present invention, fig. 14 is a schematic plane structure diagram of another display device provided in an embodiment of the present invention, in this embodiment, the display panel 111 includes a display area AA and a non-display area NA disposed around the display area AA, and a forward projection portion of the fingerprint identification element 30 to the light-emitting surface of the display panel 111 is located within a range of a part of the display area AA (as shown in fig. 13); alternatively, the orthographic projection of the fingerprint identification element 30 onto the light-emitting surface of the display panel 111 is located within the range of the whole display area AA (as shown in fig. 14).
The embodiment further explains that the forward projection part of the fingerprint identification element 30 to the light-emitting surface of the display panel 111 is located within a part of the display area AA (as shown in fig. 13); or, the orthographic projection of the fingerprint identification element 30 to the light-emitting surface of the display panel 111 is located within the range of the whole display area AA (as shown in fig. 14), so that the fingerprint identification element 30 can be integrated in the display device 1111 locally or in a full screen, the function of local or full screen fingerprint identification is realized, and the use is flexible and convenient.
By the embodiment, the backlight module and the display device provided by the invention at least realize the following beneficial effects:
the backlight module provided by the invention adopts the direct type backlight module manufactured by the mini LED lamp beads arranged in the array, has more dynamic partitions, higher dimming response speed and higher control precision, and can greatly improve the backlight response speed of the dynamic partitions and the brightness of each partition. According to the invention, a plurality of fingerprint identification elements are further arranged on one side, away from the mini LED lamp bead, of the substrate base plate, wherein each fingerprint identification element comprises an infrared emission unit and a fingerprint detection unit. Because the orthographic projection of the first through hole formed on the substrate towards the light-emitting surface of the backlight module is positioned in the orthographic projection range of the infrared emission unit towards the light-emitting surface of the backlight module, the orthographic projection of the second through hole formed on the substrate towards the light-emitting surface of the backlight module is positioned in the orthographic projection range of the fingerprint detection unit towards the light-emitting surface of the backlight module, the infrared emission unit is equivalent to an infrared emission light source and is used for emitting infrared light for fingerprint detection, and is emitted to the surface of the finger through a plurality of first through holes arranged on the substrate base plate, and after being reflected back through the valleys and ridges of the finger fingerprint, and is identified by the fingerprint detection unit at the position of the second through hole through a plurality of second through holes arranged on the substrate, because the reflected infrared light signals of the valleys and ridges of the fingerprint are different, the fingerprint detection unit can receive different fingerprint information, and finally forms a fingerprint image. The min LED backlight module does not need more optical films as the traditional backlight source, so that the signal attenuation of infrared signals sent and received by the fingerprint identification element in the film layer structure of the backlight module can be reduced to the minimum (the more materials are penetrated by the infrared signals, the more the signal loss is). A plurality of fingerprint identification components are fixed to be set up in the one side that mini LED lamp pearl was kept away from to the substrate base plate, because infrared emission unit and fingerprint detecting unit take the colour usually (or the material itself is dark), consequently all set up infrared emission unit and fingerprint detecting unit in the one side that the mini LED lamp pearl was kept away from to the substrate base plate, the light that can avoid mini LED lamp pearl to send is absorbed, perhaps block the normal propagation of light, thereby it has obvious influence to backlight unit whole luminance and taste to avoid setting up of fingerprint identification component. In addition, according to the invention, one infrared emission unit is correspondingly arranged on one first through hole, and one fingerprint detection unit is correspondingly arranged on one second through hole, so that the first through hole at each infrared emission unit is large enough, the emitted infrared light is emitted from the infrared emission unit through a sufficient hole, the second through hole at each fingerprint detection unit is large enough, the infrared light reflected by the finger can completely pass through the second through hole as far as possible, the detection signal obtained by the fingerprint detection unit is strong enough, the fingerprint detection signal can be conveniently received and emitted, and the fingerprint identification effect can be favorably improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A backlight module, comprising: a substrate base plate;
the mini LED lamp beads are arranged in an array mode and fixedly arranged on one side of the substrate;
the fingerprint identification elements are fixedly arranged on one side, far away from the miniLED lamp beads, of the substrate base plate;
along the direction parallel to the light-emitting surface of the backlight module, at least part of the substrate adjacent to the miniLED lamp beads is provided with a through hole, and the through hole penetrates through the substrate along the direction vertical to the light-emitting surface of the backlight module;
the plurality of fingerprint identification elements comprise a plurality of infrared emission units and a plurality of fingerprint detection units, and the infrared emission units and the fingerprint detection units are arranged at the positions of the through holes;
the plurality of through holes comprise first through holes and second through holes which are alternately arranged along a direction parallel to the light-emitting surface of the backlight module, the infrared emission unit is arranged at the position of the first through holes, and the fingerprint detection unit is arranged at the position of the second through holes;
the orthographic projection of the first through hole to the light-emitting surface of the backlight module is located in the orthographic projection range of the infrared emission unit to the light-emitting surface of the backlight module, and the orthographic projection of the second through hole to the light-emitting surface of the backlight module is located in the orthographic projection range of the fingerprint detection unit to the light-emitting surface of the backlight module.
2. The backlight module as claimed in claim 1, wherein the fingerprint detection unit comprises one of an infrared sensor and an infrared sensing film.
3. The backlight module as claimed in claim 1, wherein the number of the infrared emission units is greater than the number of the fingerprint detection units in the plurality of fingerprint identification elements.
4. The backlight module according to claim 1, further comprising a phosphor paste and a diffusion film, wherein the phosphor paste is located on a side of the miniLED lamp bead away from the substrate base plate, and the diffusion film is located on a side of the phosphor paste away from the substrate base plate.
5. The backlight module according to claim 1, wherein the length of the gap between two adjacent mini LED beads along the direction parallel to the light emitting surface of the backlight module is L1, the outer diameter of the through hole is L2, and L2 < L1.
6. The backlight module as claimed in claim 1, wherein the infrared emission unit and the fingerprint detection unit are located on a same plane parallel to a light emitting surface of the backlight module.
7. A display device, comprising a display panel and the backlight module as claimed in any one of claims 1 to 6, wherein the display panel is disposed at one side of the light-emitting surface of the backlight module.
8. The display device according to claim 7, further comprising a first driving circuit, a second driving circuit, and a third driving circuit, wherein the first driving circuit is electrically connected to the display panel, the second driving circuit is electrically connected to the miniLED lamp bead, and the third driving circuit is electrically connected to the fingerprint recognition element.
9. The display device according to claim 8, wherein the display device further comprises a driving chip, and the first driving circuit, the second driving circuit, and the third driving circuit are integrated on the driving chip.
10. The display device according to claim 7, wherein the display panel comprises a display area and a non-display area arranged around the display area, and a forward projection part of the fingerprint identification element to the light-emitting surface of the display panel is positioned in a part of the range of the display area; or the orthographic projection of the fingerprint identification element to the light-emitting surface of the display panel is positioned in the range of all the display areas.
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| CN201911293702.2A CN111061090B (en) | 2019-12-16 | 2019-12-16 | Backlight module and display device |
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| CN201911293702.2A CN111061090B (en) | 2019-12-16 | 2019-12-16 | Backlight module and display device |
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