CN111458932A - Backlight module and under-screen fingerprint identification display screen - Google Patents
Backlight module and under-screen fingerprint identification display screen Download PDFInfo
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- CN111458932A CN111458932A CN202010261425.3A CN202010261425A CN111458932A CN 111458932 A CN111458932 A CN 111458932A CN 202010261425 A CN202010261425 A CN 202010261425A CN 111458932 A CN111458932 A CN 111458932A
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- 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 embodiment of the invention provides a backlight module and a fingerprint identification display screen under the screen, wherein the backlight module comprises: the light guide plate is arranged on the light guide plate; the reflecting sheet, the light guide plate, the diffusion sheet and the brightness enhancement sheet are sequentially arranged in the protective outer frame from bottom to top, and the light source is fixed at the position, corresponding to the light guide plate, of the inner side wall of the protective outer frame; the upper surface and/or the lower surface of the diffusion sheet are smooth surfaces, and block-shaped bulges which are regularly arranged are distributed on the smooth surfaces; the upper surface of the brightness enhancement sheet is a smooth surface, and block-shaped bulges which are regularly arranged are also distributed on the surface of the smooth surface. The prism structure of the upper surface of the brightness enhancement sheet in the backlight module is changed into a smooth surface, and the upper surface of the diffusion sheet and/or the diffusion particle layer expressed under the diffusion sheet are/is changed into the smooth surface, so that the problem of refraction of the diffusion sheet and the brightness enhancement sheet on numerical light is avoided. The block-shaped bulges which are regularly arranged are distributed on the smooth surfaces, so that the problem that water ripples are generated due to mirror surface adsorption between the two smooth surfaces is avoided.
Description
Technical Field
The invention relates to the technical field of liquid crystal display screens, in particular to a backlight module and a fingerprint identification display screen under a screen.
Background
Along with the gradual increase of the screen of display screen on the smart mobile phone, the installation region of fingerprint identification module has obviously been taken up to the crowded, lead to the fingerprint identification module that can install the display screen below before to have to install the back of smart mobile phone, this can influence the wholeness and the aesthetic property at smart mobile phone back, consequently, each factory begins to shift the sight to how to realize fingerprint identification under the screen, fingerprint identification under the screen has been realized on O L ED screen at present, this is because the display substrate of O L ED screen is thinner, and possess self-luminous characteristic, can let partial visible light directly penetrate the display screen substrate, let the fingerprint pattern of screen top directly be gathered to the image acquisition module that sets up below the display substrate.
The method cannot be applied to the existing liquid crystal display, the liquid crystal display needs the backlight module to provide an independent backlight source for the liquid crystal panel, the backlight module cannot be directly punched to enable visible light to directly penetrate through the liquid crystal display to realize the identification of the fingerprint under the screen, and in order to enable light to penetrate through the thicker liquid crystal display to realize the identification of the fingerprint under the screen, only an infrared light scheme can be selected at present, namely infrared light is adopted to directly penetrate through the liquid crystal display to realize the identification of the fingerprint under the screen. However, the upper surface and the lower surface of the diffusion layer in the current backlight module are both provided with one diffusion particle layer, and the upper surface of the light intensifying plate is also provided with one prism structure, so that light rays in the vertical direction can be refracted, and particularly, the light rays can be seriously interfered by an infrared identifier arranged below the backlight module, so that the identification accuracy and the identification speed are remarkably reduced.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is that the diffusion sheet and the brightness enhancement sheet in the existing backlight module can obviously refract vertically incident infrared rays, so that the accuracy and precision of identifying fingerprints under a screen are reduced.
In order to solve the above technical problem, an embodiment of the present invention provides a backlight module, where the backlight module includes: the light guide plate is arranged on the light guide plate;
the reflecting sheet, the light guide plate, the diffusion sheet and the brightness enhancement sheet are sequentially arranged in the protective outer frame from bottom to top, and the light source is fixed at the position, corresponding to the light guide plate, of the inner side wall of the protective outer frame;
the upper surface and/or the lower surface of the diffusion sheet are smooth surfaces, and block-shaped bulges which are regularly arranged are distributed on the smooth surfaces;
the upper surface of the brightness enhancement sheet is a smooth surface, and block-shaped bulges which are regularly arranged are also distributed on the surface of the smooth surface.
Optionally, the diffusion sheet and/or the brightness enhancement sheet are composed of a plurality of light transmission layers with different refractive indexes.
Optionally, the plurality of light-transmitting layers with different refractive indexes are pressed into corresponding diffusion sheets and/or brightness enhancement sheets.
Optionally, the lower surface of the brightness enhancement film is also a smooth surface; when the upper surface of the diffusion sheet is a non-smooth surface, block-shaped bulges which are regularly arranged are distributed on the smooth surface of the lower surface of the brightness enhancement sheet.
Optionally, a black shading layer is further fixed on an inner side wall of the protection outer frame opposite to the light source.
Optionally, the block-shaped protrusion is a quadrilateral block-shaped protrusion, and the quadrilateral block-shaped protrusion comprises a square protrusion and a rectangular protrusion.
Optionally, when the square bumps are arranged, the height of each square bump is 0.001MM-0.003MM, the width of each square bump is 0.05MM-0.15MM, and the distance between adjacent squares is half of the width of each square bump;
when the rectangular blocks are protruded, the height of the rectangular block protrusion is 0.001MM-0.003MM, the width of the rectangular block is 0.05MM-0.15MM, the length of the rectangular block is twice of the width of the rectangular block, and the distance between adjacent rectangular blocks is half of the width of the rectangular block.
Optionally, the backlight module further comprises at least one circular through hole or runway-shaped through hole formed at a position close to the side edge or the corner;
and/or the presence of a gas in the gas,
at least one U-shaped or semicircular notch arranged on the side edge.
Optionally, a circle of metal rings corresponding to the circular through hole or the runway-shaped through hole in shape and size are further arranged in the circular through hole or the runway-shaped through hole, the protruding height of each metal ring is the same as the height of the inner side wall of the protection outer frame, and the metal rings are fixed at the bottom of the protection frame.
Further, an embodiment of the present invention further provides an off-screen fingerprint identification display screen, where the off-screen fingerprint identification display screen includes: the backlight module, the liquid crystal panel and the infrared recognizer are any one of the above;
the liquid crystal panel is arranged on the front side of the backlight module;
the infrared identifier is arranged on the back face of the backlight module and used for emitting infrared rays and identifying infrared fingerprint information reflected from the upper portion of the liquid crystal panel.
Advantageous effects
The embodiment of the invention provides a backlight module and a fingerprint identification display screen under the screen, wherein the backlight module comprises: the light guide plate is arranged on the light guide plate; the reflecting sheet, the light guide plate, the diffusion sheet and the brightness enhancement sheet are sequentially arranged in the protective outer frame from bottom to top, and the light source is fixed at the position, corresponding to the light guide plate, of the inner side wall of the protective outer frame; the upper surface and/or the lower surface of the diffusion sheet are smooth surfaces, and block-shaped bulges which are regularly arranged are distributed on the smooth surfaces; the upper surface of the brightness enhancement sheet is a smooth surface, and block-shaped bulges which are regularly arranged are also distributed on the surface of the smooth surface. In the embodiment of the invention, the prism structure of the upper surface of the brightness enhancement sheet in the backlight module is changed into the smooth surface, and the diffusion particle layer expressed on the upper surface and/or the lower surface of the diffusion sheet is changed into the smooth surface, so that the problem of refraction of logarithmic light of the diffusion sheet and the brightness enhancement sheet is solved. Meanwhile, the block-shaped bulges which are regularly arranged are distributed on the smooth surfaces, so that the problem of water ripple caused by mirror surface adsorption between the two smooth surfaces is avoided.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a partial enlarged view of a diffuser and a brightness enhancement film in a conventional backlight module;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;
fig. 3 is a partial enlarged view of a front view and a bottom view of a brightness enhancement film according to an embodiment of the present invention;
FIG. 4 is a partial enlarged view of a front view and a bottom view of a diffusion sheet according to an embodiment of the present invention;
FIG. 5 is a schematic view of a diffusion sheet or a brightness enhancement sheet according to an embodiment of the present invention;
FIG. 6 is an enlarged view of a portion of a diffuser surface in a bottom view of a square protrusion according to an embodiment of the present invention;
FIG. 7 is a partial enlarged view of rectangular protrusions on a surface of a diffusion sheet according to an embodiment of the present invention;
FIG. 8 is a front view of two types of backlight modules according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an underscreen fingerprint identification display screen according to an embodiment of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
The backlight module and the under-screen fingerprint identification display screen provided by the embodiment of the invention are finally carried on the terminal, and the terminal can be implemented in various forms. For example, the terminal described in the present invention may include a mobile terminal such as a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and the like, and a fixed terminal such as a Digital TV, a desktop computer, and the like.
First embodiment
The embodiment provides a backlight module, which includes: the light guide plate is arranged on the light guide plate; the reflecting sheet, the light guide plate, the diffusion sheet and the brightness enhancement sheet are sequentially arranged in the protective outer frame from bottom to top, and the light source is fixed at the position, corresponding to the light guide plate, of the inner side wall of the protective outer frame; the upper surface and/or the lower surface of the diffusion sheet are smooth surfaces, and block-shaped bulges which are regularly arranged are distributed on the smooth surfaces; the upper surface of the brightness enhancement sheet is a smooth surface, and block-shaped bulges which are regularly arranged are also distributed on the surface of the smooth surface.
Referring to fig. 2, fig. 3 and fig. 4, fig. 2 is a schematic structural diagram of a backlight module provided in this embodiment; fig. 3 is a partial enlarged view of a front view and a bottom view of a brightness enhancement film provided in this embodiment; fig. 4 is a partial enlarged view of a front view and a bottom view of a diffusion sheet according to the present embodiment. It should be noted that in practical applications, the diffusion sheet and the brightness enhancement sheet are composed of tens of light transmission layers, hundreds of light transmission layers, and even thousands of light transmission layers, so that the layered structure thereof cannot be clearly seen, the actual side view is closer to the bottom view in fig. 3 and 4, and the layering in fig. 2 is adjusted for convenience of display; since the height of the block-shaped protrusions is 0.001MM to 0.003MM, which is hardly visible in a side view of the entire backlight unit, the structure of the block-shaped protrusions is not visible in the upper and lower surfaces of the brightness enhancement sheet of fig. 2, and is visible only in the partially enlarged views of fig. 3 and 4.
In fig. 2, the backlight module of the present embodiment includes: a protective outer frame 201, a reflecting sheet 202, a light guide plate 203, a diffusion sheet 205, a brightness enhancement sheet 206 and a light source 204; the protective frame 201 is a frame structure with an opening at the upper end, and is usually made of a metal sheet and used for protecting other backlight components therein, the reflective sheet 202, the light guide plate 203, the diffusion sheet 205 and the brightness enhancement sheet 206 are sequentially placed in the protective frame 201 from bottom to top, the light source 204 is fixed on the position of the inner side wall of the protective frame 201 corresponding to the light guide plate 203, in the backlight module, the light source 204 generates light rays and emits the light rays into the light guide plate 203, the light guide plate 203 uniformly conducts the light rays generated by the light source 204 to the whole backlight module, the light rays emitted from the light guide plate 203 are upwards reflected by the reflective sheet 202, when the light rays enter the diffusion sheet 205 and the brightness enhancement sheet 206, most of the light rays are emitted at a certain included angle, and at the moment, the diffusion sheet 205 and the brightness enhancement sheet 206 refract the light rays and emit the light rays.
In fig. 3 and 4, in order to avoid the prism structure on the upper surface of the brightness enhancement sheet and the diffusion particle layer on the upper and lower surfaces of the diffusion sheet from refracting the vertical light, a part of the structure is eliminated, and at this time, the upper surface of the brightness enhancement sheet and the upper surface and/or the lower surface of the diffusion sheet are/is changed into smooth surfaces, when the upper surface of the brightness enhancement sheet is a smooth surface, the brightness enhancement sheet and the upper surface of the diffusion sheet are easily subjected to mirror surface adsorption to generate water ripples in the process of manufacturing a display screen, and a lead display effect is achieved; the diffusion sheet is similar, when the lower surface of the diffusion sheet is smooth, mirror surface adsorption with the light guide plate at the lower layer is easy to generate water ripples, and the lead wire has a display effect. Therefore, the smooth surfaces of the diffusion sheet and the brightness enhancement sheet of the embodiment are also provided with regularly arranged blocky bulges, the existence of the blocky bulges can avoid the mirror surface adsorption effect, and meanwhile, the blocky bulges can not refract vertical light rays. Referring specifically to fig. 3 and 4, the arrows in the figures represent light rays.
In this embodiment, the diffusion sheet and/or the brightness enhancement sheet are composed of a plurality of transparent layers with different refractive indexes. Specifically, referring to fig. 5, fig. 5 is a schematic view of a diffusion sheet or a brightness enhancement sheet provided in this embodiment. In this embodiment, the light that backlight source produced is during the light guide plate is penetrated into from the side, and light this moment presents certain angle, and this can lead to backlight unit to launch light and appear obvious dark zone and bright zone, and in order to solve this problem, diffusion piece and brightness enhancement piece include the euphotic layer of a plurality of layers of refracting indexes, and the light that will present certain contained angle through successive layer's refraction changes to vertical direction on, has avoided appearing the problem of dark zone. The light-transmitting layer is a light-transmitting film made of a light-transmitting material, such as a light-transmitting film made of pet (polyethylene terephthalate) polyester resin, and the refractive index of each layer of the light-transmitting material and the number of layers of the light-transmitting material can be changed according to the actual wavelength of light, and the specific number of layers can be tens of layers, hundreds of layers, or even thousands of layers; the light transmission layers can be combined together in a pressing mode to form the diffusion sheet.
In this embodiment, the plurality of light-transmitting layers with different refractive indexes are pressed to form corresponding diffusion sheets and/or brightness enhancement sheets. The lamination process is to place several layers of light-transmitting materials with different refractive indexes one by one in an overlapping manner, and combine the several layers of light-transmitting materials into a whole in a manner of extrusion and glue adhesion.
In this embodiment, the lower surface of the brightness enhancement film is also a smooth surface; when the upper surface of the diffusion sheet is a non-smooth surface, block-shaped bulges which are regularly arranged are distributed on the smooth surface of the lower surface of the brightness enhancement sheet.
The lower surface of the existing brightness enhancement film always has a shallow rough structure, the structure of the layer is weak to the refraction effect of light in the vertical direction, but also can generate certain influence, therefore, the influence to the light in the vertical direction is realized for further reduction, the lower surface of the brightness enhancement film can be set into a smooth surface, whether the block protrusion in regular arrangement is required to be distributed on the smooth surface at the moment is related to the upper surface of the diffusion film at the lower layer, when the upper surface of the brightness enhancement film is a non-smooth diffusion film, the block protrusion in regular arrangement is required to be distributed on the smooth surface of the lower surface of the brightness enhancement film, and the mirror surface adsorption effect is avoided. It should be noted that, in this embodiment, the upper and lower surfaces of the diffusion sheet may be smooth surfaces on both sides, or one of the sides thereof; when both sides are smooth surfaces or the upper surface is a smooth surface, regularly-arranged blocky bulges are uniformly distributed on the smooth surfaces of both sides or the smooth surface of the upper surface, at the moment, the regularly-arranged blocky bulges can not be distributed on the smooth surface of the lower surface of the brightness enhancement film positioned on the upper layer, and the regularly-arranged blocky bulges can also be distributed, so that the mirror surface adsorption effect can be avoided.
In this embodiment, a black light-shielding layer is further fixed on an inner sidewall of the protection frame opposite to the light source. The black shading layer can absorb light irradiated on the surface and can not reflect back to the light guide plate, so that the problem that light generated by the light source is conducted by the light guide plate to the side edge of the opposite side of the light source and is reflected back by the side wall to generate bright stripes is avoided.
In the present embodiment, the block-shaped protrusions are quadrangular block-shaped protrusions including any one of square protrusions and rectangular protrusions. The main function of the block-shaped protrusion is to avoid the occurrence of mirror surface adsorption, so the specific shape of the block-shaped protrusion can be any shape in principle, but from the viewpoint of practical production, it is a relatively conventional solution to arrange the block-shaped protrusion as a quadrangular block-shaped protrusion, and among the quadrangular block-shaped protrusions, a square protrusion and a rectangular protrusion are relatively common and easily realized shapes.
In the present embodiment, when the square protrusions are formed, the height of the square protrusions is 0.001MM to 0.003MM, the width of the square protrusions is 0.05MM to 0.15MM, and the distance between adjacent squares is half of the width of the square protrusions. Referring to fig. 6, fig. 6 is a partial enlarged view of a bottom view of a diffusion sheet with a surface of square protrusions provided in the present embodiment, in fig. 6, a is a height of the square protrusions of 0.001MM to 0.003MM, B is a width of the square protrusions of 0.05MM to 0.15MM, and C is a distance between two adjacent squares of half of the width B of the square. It should be noted that the above given numerical values are all interval values, and in practical applications, specific values may be within the above intervals.
In the present embodiment, when rectangular blocks are protruded, the height of the rectangular block protrusion is 0.001MM-0.003MM, the width of the rectangular block is 0.05MM-0.15MM, the length of the rectangular block is twice the width of the rectangular block, and the distance between adjacent rectangular blocks is half the width of the rectangular block. Referring to fig. 7, fig. 7 is a partial enlarged view of a rectangular protrusion on a surface of a diffusion sheet provided in the present embodiment, in fig. 7, a is a height of the rectangular protrusion is 0.001MM to 0.003MM, C is a width of the rectangular protrusion is 0.05MM to 0.15MM, a length B of the rectangular protrusion is twice a width C of the rectangular protrusion, and D and E are both half of a distance between two adjacent rectangular protrusions. It should be noted that the above given numerical values are all interval values, and in practical applications, specific values may be within the above intervals.
The beneficial effects of this embodiment:
the embodiment provides a backlight module comprising: the light guide plate is arranged on the light guide plate; the reflecting sheet, the light guide plate, the diffusion sheet and the brightness enhancement sheet are sequentially arranged in the protective outer frame from bottom to top, and the light source is fixed at the position, corresponding to the light guide plate, of the inner side wall of the protective outer frame; the upper surface and/or the lower surface of the diffusion sheet are smooth surfaces, and block-shaped bulges which are regularly arranged are distributed on the smooth surfaces; the upper surface of the brightness enhancement sheet is a smooth surface, and block-shaped bulges which are regularly arranged are also distributed on the surface of the smooth surface. In the embodiment of the invention, the prism structure of the upper surface of the brightness enhancement sheet in the backlight module is changed into the smooth surface, and the diffusion particle layer expressed on the upper surface and/or the lower surface of the diffusion sheet is changed into the smooth surface, so that the problem of refraction of logarithmic light of the diffusion sheet and the brightness enhancement sheet is solved. Meanwhile, the block-shaped bulges which are regularly arranged are distributed on the smooth surfaces, so that the problem of water ripple caused by mirror surface adsorption between the two smooth surfaces is avoided.
Second embodiment
The present embodiment provides another backlight module, which is a further extension of the first embodiment. The backlight module also comprises at least one through hole and/or at least one notch arranged on the edge. Specifically, referring to fig. 8, fig. 8 is a front view of two types of backlight modules provided in this embodiment, where 8.1 is a schematic diagram of forming a through hole in a backlight module, and 8.2 is a schematic diagram of forming a notch in a side edge of a backlight module. It can be understood that the shape of the through hole and the shape of the notch may be changed according to actual situations, the opening position may also be changed according to actual situations in addition to the illustrated position, and the number of openings and the combination relationship between the two may also be changed according to actual situations, which is not limited in this embodiment.
In this embodiment, the through hole is formed at a position of the brightness enhancement film near the side edge or the corner, and the through hole is a circular through hole or a racetrack-type through hole. The notch is a U-shaped notch or a semicircular notch. Along with the further increase of screen occupation of ratio, the screen has not only crowded occupation of original fingerprint identification's mounted position, still crowded occupation of the mounted position of assemblies such as original leading camera and distance sensor, consequently in order to realize installing assemblies such as leading camera and distance sensor in the screen, we need trompil in liquid crystal module's backlight unit and be used for installing the subassembly that corresponds, perhaps need the trompil in the light intensifying piece that corresponds, specific through-hole is common to be more with circular and runway type, the breach is more with U-shaped breach or semi-circular breach.
In this embodiment, a circle of metal ring corresponding to the shape and size is further disposed in the circular through hole or the racetrack-shaped through hole, the height of the protrusion of the metal ring is the same as the height of the inner side wall of the protection outer frame, and the metal ring is fixed at the bottom of the protection frame. The through hole is arranged in the backlight module, the through hole can directly penetrate through the components such as the protective outer frame, the reflecting sheet, the light guide plate, the diffusion sheet and the brightness enhancement sheet, and the through hole is arranged for mounting the front camera. Therefore, a circle of metal ring corresponding to the shape and size is arranged around the through hole, the protruding height of the metal ring is the same as the height of the inner side wall of the protective outer frame, light rays in the light guide plate can be shielded, and the surface light rays are prevented from leaking into the through hole.
The embodiment provides a diffusion sheet, on the basis of the first embodiment, the diffusion sheet is further provided with a through hole and/or a notch at the edge of the diffusion sheet, and the through hole and the notch can be used for installing components such as a front camera and a distance sensor.
Third embodiment
The embodiment also provides a screen fingerprint identification display screen, which comprises the backlight module, a liquid crystal panel and an infrared identifier, wherein the liquid crystal panel is arranged above the front side of the backlight module; the infrared identifier is fixed on the back of the backlight module and used for penetrating through the backlight module and the liquid crystal panel to identify the infrared information of the fingerprint.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an underscreen fingerprint identification display screen provided in this embodiment. This fingerprint identification display screen includes: the backlight module comprises a protective outer frame 201, a reflector plate 202, a light guide plate 203, a light source 204, a diffusion sheet 205, a brightness enhancement sheet 206, an infrared identifier 901, a liquid crystal panel 902 and a user fingerprint 903, wherein the liquid crystal panel 902 is arranged above the front face of the backlight module, the infrared identifier 901 is fixed on the back face of the backlight module, when the infrared identifier 901 works, infrared light is emitted to penetrate through the backlight module and the liquid crystal panel 902 and is reflected back to the infrared identifier 901 from the user fingerprint 903, and the infrared identifier 901 determines whether a user is an authorized user or not through infrared information of the identified fingerprint.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A backlight module is characterized in that the backlight module comprises: the light guide plate is arranged on the light guide plate;
the reflecting sheet, the light guide plate, the diffusion sheet and the brightness enhancement sheet are sequentially arranged in the protective outer frame from bottom to top, and the light source is fixed at the position, corresponding to the light guide plate, of the inner side wall of the protective outer frame;
the upper surface and/or the lower surface of the diffusion sheet are smooth surfaces, and block-shaped bulges which are regularly arranged are distributed on the smooth surfaces;
the upper surface of the brightness enhancement sheet is a smooth surface, and block-shaped bulges which are regularly arranged are also distributed on the surface of the smooth surface.
2. The backlight module as claimed in claim 1, wherein the diffusion sheet and/or the brightness enhancement sheet comprises a plurality of transparent layers with different refractive indexes.
3. The backlight module as claimed in claim 2, wherein the plurality of light-transmitting layers with different refractive indexes are laminated to form corresponding diffusion sheets and/or brightness enhancement sheets.
4. The backlight module as claimed in claim 1, wherein the lower surface of the brightness enhancement film is also smooth; when the upper surface of the diffusion sheet is a non-smooth surface, block-shaped bulges which are regularly arranged are distributed on the smooth surface of the lower surface of the brightness enhancement sheet.
5. The backlight module as claimed in claim 1, wherein a black light-shielding layer is further fixed on an inner sidewall of the protective outer frame opposite to the light source.
6. The backlight module according to any of claims 1-5, wherein the block-shaped protrusions are quadrilateral block-shaped protrusions, and the quadrilateral block-shaped protrusions comprise square protrusions and rectangular protrusions.
7. The backlight module as claimed in claim 6, wherein the height of the protrusions is 0.001MM-0.003MM, the width of the dice is 0.05MM-0.15MM, and the distance between adjacent dice is half of the width of the dice;
when the rectangular blocks are protruded, the height of the rectangular block protrusion is 0.001MM-0.003MM, the width of the rectangular block is 0.05MM-0.15MM, the length of the rectangular block is twice of the width of the rectangular block, and the distance between adjacent rectangular blocks is half of the width of the rectangular block.
8. The backlight module according to any one of claims 1-5, further comprising at least one circular through hole or racetrack-type through hole formed near a side edge or a corner;
and/or the presence of a gas in the gas,
at least one U-shaped or semicircular notch arranged on the side edge.
9. The backlight module as claimed in claim 8, wherein a ring of metal rings having corresponding shape and size are further disposed in the circular through hole or the racetrack via, the height of the protrusion of the metal ring is the same as the height of the inner sidewall of the protective outer frame, and the metal ring is fixed at the bottom of the protective frame.
10. The utility model provides a fingerprint identification display screen under screen which characterized in that, fingerprint identification display screen includes under the screen: the backlight module, the liquid crystal panel and the infrared recognizer according to any one of claims 1 to 9;
the liquid crystal panel is arranged on the front side of the backlight module;
the infrared identifier is arranged on the back face of the backlight module and used for emitting infrared rays and identifying infrared fingerprint information reflected from the upper portion of the liquid crystal panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010261425.3A CN111458932A (en) | 2020-04-03 | 2020-04-03 | Backlight module and under-screen fingerprint identification display screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010261425.3A CN111458932A (en) | 2020-04-03 | 2020-04-03 | Backlight module and under-screen fingerprint identification display screen |
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| CN111458932A true CN111458932A (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010261425.3A Pending CN111458932A (en) | 2020-04-03 | 2020-04-03 | Backlight module and under-screen fingerprint identification display screen |
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