CN110095901B - Side income formula backlight unit and fingerprint identification device under screen with cavity - Google Patents
Side income formula backlight unit and fingerprint identification device under screen with cavity Download PDFInfo
- Publication number
- CN110095901B CN110095901B CN201910413867.2A CN201910413867A CN110095901B CN 110095901 B CN110095901 B CN 110095901B CN 201910413867 A CN201910413867 A CN 201910413867A CN 110095901 B CN110095901 B CN 110095901B
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- cavity
- backlight module
- module
- accommodating cavity
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 21
- 239000012788 optical film Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 11
- 239000010408 film Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052742 iron Inorganic materials 0.000 abstract description 6
- 230000000007 visual effect Effects 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000003292 glue Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008542 thermal sensitivity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- G02F1/1339—Gaskets; Spacers; Sealing of cells
-
- 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
Abstract
The invention discloses a side-in type backlight module with a concave cavity and an under-screen fingerprint identification device. In addition, the two side rubber frames of the concave cavity of the backlight module are adhered with the liquid crystal module above in parallel. The fingerprint identification module is arranged in the accommodating cavity, so that the frame proportion can be reduced, and the screen occupation ratio can be improved; secondly, as the two side rubber frames of the concave cavity of the backlight module are adhered with the liquid crystal module above in parallel, the two sides of the accommodating cavity can be sealed. The two sides of the accommodating cavity do not need to be additionally stretched to seal the rubber frame (or the iron frame), so that a wider black or white area is avoided, and the visual effect of the backlight module is improved.
Description
Technical Field
The invention relates to the technical field of fingerprint identification under a screen, in particular to a side-in backlight module with a concave cavity and a fingerprint identification device under the screen.
Background
With the rapid development of Liquid Crystal Display (LCD) and the popularization of full-screen, the technology of fingerprint identification under screen has become a future development trend. From the principle of the current fingerprint identification technology, the common fingerprint identification modes are respectively optical, capacitance, thermal sensitivity and ultrasonic. For LCD display screens, optical fingerprint recognition with higher penetration is currently the main research direction.
In the LCD display device which has realized the fingerprint identification under the screen, the fingerprint sensor is arranged below the backlight module. Because the backlight module in the device is direct type light source backlight module, fingerprint identification light emitted by the fingerprint detection light emitter can penetrate through the backlight module and be conveyed to the fingerprint identification sensor for identification after being reflected by the glass panel. However, for the backlight module with the side-in light source, fingerprint recognition light cannot pass through the backlight module, and the fingerprint recognition sensor cannot realize under-screen fingerprint recognition if arranged below the backlight module, so that the fingerprint recognition sensor needs to be arranged above the backlight module or beside the backlight module. But when the fingerprint identification sensor is arranged beside the backlight module, the frame is too wide, so that the development of a full screen is not facilitated. Therefore, the fingerprint identification sensor is arranged above the backlight module as the best choice.
At present, the fingerprint identification sensor is disposed above the backlight module, as shown in fig. 1, the backlight module is bent to form a receiving cavity with the liquid crystal module, and then the fingerprint identification sensor is disposed in the receiving cavity. Because the two sides of the accommodating cavity are generally sealed by stretching the rubber frame (or the iron frame), a relatively wide black or white area can appear on the two sides of the accommodating cavity, thereby affecting the visual effect of the backlight module.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a side-in backlight module with a concave cavity and an under-screen fingerprint identification device.
The invention adopts the technical proposal for solving the problems that:
the utility model provides a side income formula backlight unit with cavity, includes light guide plate, optics diaphragm group, light source subassembly and glues the frame, glue the frame and surround light guide plate, optics diaphragm group and light source subassembly wherein, light guide plate, optics diaphragm group and glues the frame and be close to the both sides of light source subassembly one end are to the middle region indent to form a cavity.
Further, the cross section of the concave cavity is in an inverted trapezoid shape, and the longitudinal section of the concave cavity is in a triangle shape.
Further, the cross section of the concave cavity is in a reverse trapezoid shape, and the joint of the two side edges and the lower bottom edge of the reverse trapezoid is provided with a fillet transition; the longitudinal section of the concave cavity is triangular.
The second aspect of the present invention also provides an under-screen fingerprint recognition device, comprising a fingerprint recognition module, a glass panel, a liquid crystal module and a backlight module provided by the first aspect, wherein:
the glass panel, the liquid crystal module and the backlight module are sequentially arranged in a stacked manner from top to bottom;
a containing cavity is formed between the concave cavity of the backlight module and the liquid crystal module;
the two side rubber frames of the concave cavity of the backlight module are adhered with the liquid crystal module in parallel;
the fingerprint identification module is arranged in the accommodating cavity.
The fingerprint identification module is arranged in the accommodating cavity, so that the frame proportion can be reduced, and the screen occupation ratio can be improved; secondly, as the two side rubber frames of the concave cavity of the backlight module are adhered with the liquid crystal module above in parallel, the two sides of the accommodating cavity can be sealed. The two sides of the accommodating cavity do not need to be additionally stretched to seal the rubber frame (or the iron frame), so that a wider black or white area is avoided, and the visual effect of the backlight module is improved.
Further, the cross section of the accommodating cavity is in an inverted trapezoid shape, and the joint of the two side edges and the lower bottom edge of the inverted trapezoid shape is provided with a fillet transition; the longitudinal section of the concave cavity is triangular.
Further, the included angle alpha of the longitudinal section of the accommodating cavity is 1-20 degrees.
Further, the height h of the cross section of the accommodating cavity is 0.5-3 mm.
Further, the length l of the longitudinal section of the accommodating cavity is 5-40 mm.
Further, the width w1 of the upper side of the cross section of the accommodating cavity is consistent with the width of the optical film set in the backlight module, and the width w2 of the lower side is 5-40 mm.
Further, the fingerprint identification module comprises a fingerprint detection light emitter and a fingerprint identification sensor.
Further, the light source assembly further comprises a sealing structure, wherein the sealing structure seals one end of the accommodating cavity, which is close to the light source assembly.
Specifically, the side of the accommodation cavity, which is close to the light source component, is sealed by stretching the rubber frame (or the iron frame).
The sealing structure can isolate dust, water, air and other foreign matters.
Compared with the prior art, the invention has the beneficial effects that:
according to the under-screen fingerprint identification device provided by the invention, the fingerprint identification module is arranged in the accommodating cavity, so that the frame proportion can be reduced, and the screen occupation ratio can be improved; secondly, as the two side rubber frames of the concave cavity of the backlight module are adhered with the liquid crystal module above in parallel, the two sides of the accommodating cavity can be sealed. The two sides of the accommodating cavity do not need to be additionally stretched to seal the rubber frame (or the iron frame), so that a wider black or white area is avoided, and the visual effect of the backlight module is improved.
Drawings
Fig. 1 is a schematic structural view of a prior art in which two sides of a receiving chamber are sealed by stretching a rubber frame.
FIG. 2 is a schematic diagram of a backlight module according to an embodiment of the invention;
FIG. 3 is an enlarged partial schematic view of portion A of FIG. 2;
FIG. 4 is a top view of a backlight module according to an embodiment of the invention;
FIG. 5 is a top view of a backlight module according to another embodiment of the invention;
FIG. 6 is a schematic diagram of an exemplary embodiment of an on-screen fingerprint recognition device;
FIG. 7 is a schematic view of the structure of section B-B of FIG. 6.
FIG. 8 is a schematic view of the structure of section C-C of FIG. 6.
Wherein, the reference numerals are as follows:
glass panel 1, liquid crystal module 2, backlight module 3, upper light enhancement film 31, lower light enhancement film 32, diffusion film 33, light guide plate 34, shading adhesive 35, light source assembly 36, adhesive frame 37, cavity 38, side inclined surface 381, connection surface 382, middle inclined surface 383, accommodation cavity 4, and sealing structure 5.
Detailed Description
For a better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
Referring to fig. 2-4, a first aspect of the present invention provides a side-entry backlight module with a cavity 38, where the backlight module 3 includes an optical film set, a light guide plate 34, a light shielding adhesive 35, a light source assembly 36, and an adhesive frame 37, where the optical film set is disposed on the light guide plate 34, and the adhesive frame 37 encloses the light guide plate 34, the optical film set, and the light source assembly 36. In this embodiment, the optical film group includes an upper light enhancement film 31, a lower light enhancement film 32 and a diffusion film 33, which are sequentially stacked from top to bottom, and the light source assembly 36 is an LED lamp; the light-shielding glue 35 is adhered to the glue frame 37 and the upper light-increasing sheet 31. The light guide plate 34, the optical film set and the rubber frame 37 in the backlight module 3 are concaved inwards in the middle area at two sides near one end of the light source assembly 36 to form a concave cavity 38, and in the embodiment, the cross section of the concave cavity 38 is inverted trapezoid, and the longitudinal section is triangular; that is, the bottom surface of the cavity 38 is composed of both side inclined surfaces 381 and a middle inclined surface 383, and the side inclined surfaces 381 are in line connection with the middle inclined surface 383.
Example two
Referring to fig. 5, the backlight module 3 is different from the backlight module 3 in the first embodiment in that: the cross section of the concave cavity 38 is in an inverted trapezoid shape, and the connection part of the two side edges and the lower bottom edge of the inverted trapezoid shape is provided with a fillet transition; the recess 38 has a triangular longitudinal cross-section. That is, the bottom surface of the cavity 38 is composed of both side inclined surfaces 381, a middle inclined surface 383, and a connecting surface 382 connecting both side inclined surfaces 381 and the middle inclined surface 383. In this embodiment, the connection surface 382 is a fan-shaped curved surface. From the processing perspective, the sector curved surface is easier to process than the linear connection, and the connection part is relatively difficult to break; from the light processing perspective, the curved surface connection is smoother than the linear connection, no rays appear, and the brightness of the backlight module 3 is more uniform.
Example III
Referring to fig. 6-8, a second aspect of the present invention provides an under-screen fingerprint recognition device, which includes a fingerprint recognition module, a glass panel 1, a liquid crystal module 2, and a backlight module 3 provided in the first aspect, where the glass panel 1, the liquid crystal module 2, and the backlight module 3 are sequentially stacked from top to bottom, and in this embodiment, the backlight module 3 is adhered to the liquid crystal module 2 through a light shielding adhesive 35. A containing cavity 4 for containing a fingerprint identification module is formed between the concave cavity 38 of the backlight module 3 and the liquid crystal module 2, in this embodiment, the cross section of the containing cavity 4 is in an inverted trapezoid shape, and the connection part between the two sides of the inverted trapezoid and the lower bottom edge is provided with a fillet transition; the longitudinal section of the accommodating cavity 4 is triangular. The included angle alpha of the longitudinal section of the accommodating cavity 4 is 15 degrees, the height h of the cross section is 1.1mm, the length l of the longitudinal section is 8.61mm, the width of the upper side width w1 of the cross section is consistent with the width of the optical film group in the backlight module 3, and the width of the lower side width w2 of the cross section is 20mm. In addition, the two side frames 37 of the concave cavity 38 of the backlight module 3 are adhered in parallel with the liquid crystal module 2 above, so that the two sides of the accommodating cavity 4 can be sealed. The end of the accommodating cavity 4 close to the light source assembly 36 is sealed by the sealing structure 5, in this embodiment, the sealing structure 5 is formed by stretching the plastic frame 37 close to the light source assembly 36, and only a gap for the fingerprint identification module to enter needs to be left on the sealing structure 5. In other embodiments, the sealing structure 5 can be separately and additionally processed, and the material thereof can be colloid or metal, so long as the accommodating cavity 4 can be sealed and a gap for the fingerprint identification module to enter is reserved. In addition, in this embodiment, the fingerprint recognition module includes a fingerprint detection light emitter and a fingerprint recognition sensor.
The fingerprint identification module is arranged in the accommodating cavity 4, so that the frame proportion can be reduced, and the screen occupation ratio can be improved; secondly, the two side frames 37 of the concave cavity 38 of the backlight module 3 are adhered to the liquid crystal module 2 above in parallel, so that the two sides of the accommodating cavity 4 can be sealed. The two sides of the accommodating cavity 4 do not need to be additionally stretched to seal the rubber frame 37 (or the iron frame), so that a relatively wide black or white area is avoided, and the visual effect of the backlight module 3 is improved.
The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (9)
1. The side-entering type backlight module with the concave cavity (38) comprises a light guide plate (34), an optical film group, a light source assembly (36) and a rubber frame (37), wherein the rubber frame (37) surrounds the light guide plate (34), the optical film group and the light source assembly (36), and the side-entering type backlight module is characterized in that the light guide plate (34), the optical film group and the rubber frame (37) are concave inwards in the middle area at two sides close to one end of the light source assembly (36), so that a concave cavity (38) is formed;
the cross section of the concave cavity (38) is in an inverted trapezoid shape, and the longitudinal section of the concave cavity is in a triangle shape;
the optical film group comprises an upper brightness enhancement film (31), a lower brightness enhancement film (32) and a diffusion sheet (33).
2. The side entry backlight module according to claim 1, wherein the cross section of the cavity (38) is shaped like an inverted trapezoid, and the connection between the two sides and the lower bottom of the inverted trapezoid is provided with a rounded transition; the longitudinal section of the concave cavity (38) is triangular.
3. An under-screen fingerprint recognition device, characterized by comprising a fingerprint recognition module, a glass panel (1), a liquid crystal module (2) and a backlight module (3) as claimed in claim 1 or 2, wherein:
the glass panel (1), the liquid crystal module (2) and the backlight module (3) are sequentially arranged in a stacked manner from top to bottom;
a containing cavity (4) is formed between the concave cavity (38) of the backlight module (3) and the liquid crystal module (2);
the two side rubber frames (37) of the concave cavity (38) of the backlight module (3) are adhered in parallel with the liquid crystal module (2);
the fingerprint identification module is arranged in the accommodating cavity (4).
4. An under-screen fingerprint recognition device according to claim 3, wherein the cross section of the accommodating cavity (4) is in an inverted trapezoid shape, and the connection part of two side edges and the lower bottom edge of the inverted trapezoid shape is provided with a fillet transition.
5. The device according to claim 4, wherein the included angle α of the longitudinal section of the accommodating cavity (4) is 1-20 °.
6. The device according to claim 4, wherein the height h of the cross section of the accommodating cavity (4) is 0.5-3 mm.
7. The under-screen fingerprint identification device according to claim 4, wherein the length l of the longitudinal section of the accommodating cavity (4) is 5-40 mm.
8. The device for identifying the fingerprint under the screen according to claim 4, wherein the width w1 of the upper side of the cross section of the accommodating cavity (4) is consistent with the width of the optical film group in the backlight module (3), and the width w2 of the lower side is 5-40 mm.
9. An off-screen fingerprint recognition device according to any one of claims 4-8, further comprising a sealing structure (5), said sealing structure (5) sealing an end of the receiving cavity (4) adjacent to the light source assembly (36).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910413867.2A CN110095901B (en) | 2019-05-17 | 2019-05-17 | Side income formula backlight unit and fingerprint identification device under screen with cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910413867.2A CN110095901B (en) | 2019-05-17 | 2019-05-17 | Side income formula backlight unit and fingerprint identification device under screen with cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110095901A CN110095901A (en) | 2019-08-06 |
| CN110095901B true CN110095901B (en) | 2024-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910413867.2A Active CN110095901B (en) | 2019-05-17 | 2019-05-17 | Side income formula backlight unit and fingerprint identification device under screen with cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110095901B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111066028B (en) * | 2019-11-04 | 2023-09-08 | 深圳市汇顶科技股份有限公司 | Fingerprint identification system of liquid crystal display screen, electronic device and fingerprint identification module |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110095901A (en) | 2019-08-06 |
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