CN210109513U - Backlight module for fingerprint identification in LCD screen - Google Patents
Backlight module for fingerprint identification in LCD screen Download PDFInfo
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- CN210109513U CN210109513U CN201920623609.2U CN201920623609U CN210109513U CN 210109513 U CN210109513 U CN 210109513U CN 201920623609 U CN201920623609 U CN 201920623609U CN 210109513 U CN210109513 U CN 210109513U
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- 239000013047 polymeric layer Substances 0.000 claims description 12
- 230000002708 enhancing effect Effects 0.000 claims description 3
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- 239000010408 film Substances 0.000 description 61
- 239000000463 material Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 239000012788 optical film Substances 0.000 description 5
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- 238000000034 method Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
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- 239000012528 membrane Substances 0.000 description 2
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- 230000002745 absorbent Effects 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The utility model discloses a backlight module for fingerprint identification in LCD screen, which comprises a light source, a light guide plate arranged at one side of the light source, a reflector plate arranged below the light guide plate, a diffusion sheet arranged at the upper side of the light guide plate, and a brightness enhancement film arranged at the upper side of the diffusion sheet; wherein, the surface of the brightness enhancement film is provided with a plurality of lens structures and a plurality of platform structures; the platform structure comprises a platform part; the platform structure is disposed between and/or over the plurality of lens structures such that external light is substantially perpendicularly incident and substantially perpendicularly exiting through the plane of the brightness enhancement film. Backlight unit makes the LCD module can make fingerprint identification signal effectively pierce through and the accurate collection on the LCD module, realizes the in-screen fingerprint identification function of LCD display device and discerns.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a backlight unit for fingerprint identification in LCD screen.
Background
Fingerprint sensing and matching is a reliable and widely used technique. A common method of fingerprint identification involves scanning a sample fingerprint or an image thereof and storing the image and/or unique features of the fingerprint image, which can be compared with information of reference fingerprints already present in a database to determine the correct identification of the user, e.g. for authentication purposes. In particular, in-display (in-display) fingerprinting is now becoming increasingly popular due to its ease of operation and versatility and its suitability for compact portable electronic devices.
At present, the fingerprint identification display device in the screen mainly adopts an OLED display, which is mainly because the OLED display is thinner and lighter and is easier to integrate a fingerprint identification sensor. However, Liquid Crystal Displays (LCDs) have a cost advantage over OLEDs. The existing solution of the fingerprint identification display device in the LCD screen is to use a CMOS (Complementary Metal Oxide Semiconductor) image sensor under the LCD screen, where the CMOS image sensor is not completely built in the display, but can realize fingerprint sensing by sacrificing some thickness in the active area of the display. However, the in-screen fingerprint identification display device based on the LCD display is not fully mature, and especially effective penetration and accurate collection of fingerprint identification signals on the LCD module cannot be considered at the same time.
In the in-screen fingerprint recognition display device of the LCD display, as shown in fig. 1, by recognizing a fingerprint pressed on a glass cover plate 140 covering the LCD display screen; however, the optical signal for identifying the fingerprint at least passes through the LCD panel and the glass cover plate 140, and since the LCD panel is composed of the LCD module 130 and the backlight module 120, the glass cover plate has a certain thickness. Therefore, the optical signal is severely refracted and scattered, or even totally reflected, during the process of transmitting through the LCD module, the backlight module and the glass cover plate. Especially, the feedback optical signal carrying the biometric fingerprint information is seriously affected by a plurality of functional optical films in the backlight module, such as a brightness enhancement film, a diffusion sheet, a reflection sheet and the like to refract, scatter and reflect the feedback optical signal, thereby causing the loss of the feedback optical signal or serious optical noise pollution, causing the optical sensor 110 below the LCD screen to collect ineffective and accurate signals, and further failing to identify the biometric fingerprint information.
The optical film in the backlight module which has the greatest influence on the accurate collection of the optical signals is the brightness enhancement film. In the prior art, a brightness enhancement film is disposed in a backlight module of an LCD to improve light emitting efficiency. Fig. 2 is a diagram of a conventional brightness enhancement film. As shown in fig. 2, the brightness enhancement film 310 includes a body portion 320 and a plurality of lens structures 330. The lens structures 130 are isosceles right triangular prisms and are formed in the body part 320 in a repeated arrangement and arranged in an array. Fig. 3 is a graph showing the relationship between viewing angle and brightness for the brightness enhancement film of fig. 2. As shown in fig. 3, wherein the abscissa represents the light output angle after light passes through the conventional brightness enhancement film and the ordinate represents the brightness of the light. The bold lines in fig. 3 represent the vertical dependence of the viewing angle on the brightness of a conventional brightness enhancement film, while the thin lines represent the horizontal dependence of the viewing angle on the brightness of a conventional brightness enhancement film. Therefore, the conventional brightness enhancement film has a light condensing effect. However, when the optical signal for collecting the biological fingerprint information passes through the conventional brightness enhancement film, the optical signal is also gathered and scattered in a non-directional manner, so that the loss of the target feedback optical signal or the optical noise pollution is serious.
Therefore, the realization of the fingerprint identification function in the screen of the LCD display requires the improvement of the overall design of the backlight module, especially the design of the optical mechanism of the brightness enhancement film and the adjustment of other optical films designed to match the optical mechanism.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a backlight unit for fingerprint identification in the LCD screen, can make fingerprint identification signal effectively pierce through and the accurate collection on the LCD module.
In order to solve the technical problem, the utility model discloses a technical scheme be: a backlight module, comprising: the backlight module comprises a light source, a light guide plate arranged on one side of the light source, a reflecting sheet arranged below the light guide plate, a diffusion sheet arranged on the upper side of the light guide plate, and a brightness enhancement film arranged on the upper side of the diffusion sheet; wherein, the surface of the brightness enhancement film is provided with a plurality of lens structures and a plurality of platform structures; the platform structure comprises a platform part; the platform structure is arranged between the plurality of lens structures and/or above the plurality of lens structures, so that external light basically vertically penetrates through the plane of the brightness enhancement film.
Here, substantially perpendicular transmission means that the optical signal transmitted through the mesa structure is within 90 + -15 deg. of the plane of the brightness enhancement film. Here, the platform structure adjusts the incident or emergent optical signal into parallel light substantially perpendicular to the plane of the brightness enhancement film, and the platform structure is arranged to solve the problems of total reflection and non-directional scattering of light in the lens structure of the conventional brightness enhancement film.
The utility model discloses a brightness enhancement film is used for emergent optical signal of surveying to being surveyed by the detected object, and on the other hand detected object's feedback light signal can be close to see through brightness enhancement film and backlight unit harmlessly to gather effectively by the beneath optical sensor accuracy of LCD screen, and then realize fingerprint identification function discernment in LCD display's the screen. The platform structure is continuously or discontinuously arranged among the plurality of lens structures and/or on the plurality of lens structures.
Preferably, the brightness enhancing film comprises a first polymer layer and a second polymer layer. The first polymer layer is provided with a microstructured surface, and the lens structure and the platform structure are arranged on the microstructured surface; the lens structures and the platform structures are arrayed on the microstructured surface.
And the second polymer layer is positioned between the first polymer layer and the diffusion sheet and is adjacent to the first polymer layer. The microstructured surface of the first polymer layer is arranged in parallel with the light guide plate or the reflector plate, so that light of the backlight source and the fingerprint identification optical signal can sufficiently penetrate through the microstructured surface.
The first high polymer layer and the second high polymer layer also have an ultraviolet light absorption function, and the ultraviolet absorbent filled in the first high polymer layer and the second high polymer layer can reduce the deterioration of the LCD and the high polymer optical film due to ultraviolet radiation.
Preferably, the angle between the plane of the platform and the plane of the microstructured surface is less than 10 °.
Preferably, the width of the land is less than 1/2 of the minimum distance between adjacent lens structures.
Preferably, the mesa structure has a refractive index substantially equal to that of the first polymer layer.
Preferably, the mesa structure has a refractive index smaller than that of the first polymer layer.
Preferably, the lens structure and the mesa structure are also disposed on the second polymer layer.
Preferably, the orientation of the lens structures on the microstructured surface of the first polymeric layer is different from the orientation of the lens structures on the second polymeric layer. Further, the orientation of the lens structures on the microstructured surface of the first polymer layer is substantially perpendicular to the orientation of the lens structures on the second polymer layer.
Preferably, the lens structures on the microstructured surface of the first polymeric layer and the lens structures on the second polymeric layer each comprise a plurality of triangular prisms or triangular-like prisms having rounded vertices.
Preferably, the diffusion particles in the diffusion sheet are uniformly distributed in the diffusion sheet in a stripe shape or random dot shape.
Preferably, the diffusion sheet is provided with a low haze region having a haze lower than that of other regions of the diffusion sheet. Further, the haze of the diffuser increases in a radial gradient from its low haze region to other portions. Alternatively, the haze of the diffusion sheet changes from a low haze region to other parts, and the haze changes alternately to form a ripple distribution or a fringe distribution with high haze. The low-haze area of the diffusion sheet has a diffusion effect, and meanwhile, the low-haze area is light-permeable, so that the brightness of the backlight module can be improved.
Preferably, the backlight module further comprises an optical sensor element to transmit and/or receive the optical biometric fingerprint signal.
Preferably, the optical sensor element is disposed between the light guide plate and the reflective sheet.
Preferably, the optical sensor element is disposed below the reflective sheet.
Preferably, the optical sensor element is embedded in the reflective sheet.
Preferably, the optical sensor element is disposed above the brightness enhancement film.
According to the utility model discloses an embodiment, the utility model discloses a backlight unit can be applied to the LCD display and be used for fingerprint identification's electron device. The utility model discloses a backlight unit is applied to fingerprint identification's electron device, can realize the accurate discernment and the verification to biological fingerprint information.
Drawings
The invention and its advantages will be better understood by studying the following non-limiting examples, and by studying the detailed description of specific embodiments shown in the appended drawings, in which:
FIG. 1 is an on-screen fingerprint identification display device of a prior art LCD display.
Fig. 2 is a representation of a prior art brightness enhancement film.
Fig. 3 is a graph of the relationship between viewing angle and brightness for a brightness enhancement film of the prior art.
Fig. 4 is a schematic view of a backlight module according to embodiment 1 of the present invention.
Fig. 5 is a cross-sectional structural view of a brightness enhancement film according to embodiment 1 of the present invention.
Fig. 6 is a cross-sectional structural view of a brightness enhancement film according to embodiment 7 of the present invention.
Fig. 7 is a cross-sectional view showing a light traveling direction in the platform structure shown in fig. 5 according to the present invention.
Fig. 8 is a diagram showing a cross-sectional structure of the first polymer layer and the second polymer layer of the brightness enhancement film according to embodiment 1 of the present invention.
Fig. 9 is a diagram showing a cross-sectional structure of the first polymer layer and the second polymer layer of the brightness enhancement film according to example 2 of the present invention.
Fig. 10 is a diagram showing a cross-sectional structure of the first polymer layer and the second polymer layer of the brightness enhancement film according to example 3 of the present invention.
Fig. 11 is a diagram showing a cross-sectional structure of the first polymer layer and the second polymer layer of the brightness enhancement film according to example 4 of the present invention.
Fig. 12 is a cross-sectional view of a first polymer layer of a brightness enhancement film of a backlight module according to embodiment 5 of the present invention.
Fig. 13 is a cross-sectional view of a first polymer layer of a brightness enhancement film of a backlight module according to embodiment 6 of the present invention.
Fig. 14 is a cross-sectional view of a first polymer layer of a brightness enhancement film of a backlight module according to embodiment 8 of the present invention.
Fig. 15 is a cross-sectional view of a first polymer layer of a brightness enhancement film of a backlight module according to embodiment 9 of the present invention.
Fig. 16 is a plan view of a diffusion membrane according to example 5 of the present invention.
Fig. 17 is a plan view of a diffusion membrane according to example 6 of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
Example 1
First, a backlight module according to embodiment 1 of the present invention will be described with reference to fig. 4, 5, and 7. According to the backlight module of embodiment 1 of the present invention, the backlight module includes a light source 221, a light guide plate 220 disposed at one side of the light source 221, a reflective sheet 210 disposed below the light guide plate 220, a diffusion sheet 230 disposed at an upper side of the light guide plate 220, and a brightness enhancement film 240 disposed at an upper side of the diffusion sheet; wherein, the surface of the base material 2401 of the brightness enhancement film 240 is provided with a plurality of lens structures 2402 and a plurality of platform structures 2403; the platform structure includes a platform portion 24031; the mesa structure is disposed between the plurality of lens structures 2402 and allows external light to enter and exit substantially perpendicularly through the plane of the brightness enhancement film 240.
Here, mesa structure 2403 aligns the incoming or outgoing optical signal to be substantially parallel light perpendicular to the plane of brightness enhancement film 240, as shown in FIG. 7. There are two main ways of exiting through the platform, where the light does not shine on the side of the platform structure 2403 and exits through the platform directly as L1; on the other hand, the optical signal is reflected by the side surface of the mesa structure 2403, is reflected again by the reflection sheet 210, and is emitted from the mesa portion as L2. Here, the optical signal reflected by the side surface of the mesa structure 2403 may exit from the mesa structure 2403, or may exit from another mesa structure adjacent to the mesa structure. Therefore, the feedback optical signal of the detected object can nearly pass through the brightness enhancement film 240 and the backlight module without damage, and on the other hand, the emergent optical signal for detection is accurately transmitted to the detected object for detection and is accurately and effectively collected by the optical sensor below the LCD screen, so that the in-screen fingerprint identification function of the LCD display is identified.
The brightness enhancing film 240 includes a first polymer layer 310 and a second polymer layer 320. The first polymer layer 310 has a microstructured surface on which the lens structure 2402 and the mesa structure 2403 are disposed; the lens structures 2402 and mesa structures 2403 are arrayed on the microstructured surface. And a second polymer layer 320 between the first polymer layer 310 and the diffusion sheet and disposed adjacent to the first polymer layer 310. The microstructured surface of the first polymer layer 310 is disposed parallel to the light guide plate or the reflective sheet, so that the light from the backlight and the optical fingerprint recognition signal can sufficiently penetrate. The first and second polymer layers 310 and 320 also have an ultraviolet light absorption function, and the ultraviolet absorbers filled in the first and second polymer layers 310 and 320 can reduce the deterioration of the LCD and the polymer optical film due to ultraviolet radiation.
The angle between the plane of the platform portion and the plane of the microstructured surface is 0 °; the width of the land portion is equal to 1/5 of the minimum distance between adjacent lens structures 2402. The mesa structure 2403 has a refractive index substantially equal to that of the first polymer layer 310, and the mesa structure 2403 and the first polymer layer 310 may be the same optical material.
As shown in fig. 8, the lens structure 2402 and the mesa structure 2403 are also disposed on the second polymer layer 320, the mesa structure 2403 on the first polymer corresponds to the mesa structure 2403 on the second polymer layer 320, and the mesa structure 2403 protrudes out of the plane of the first polymer layer 310 or the second polymer layer 320 and has a trapezoidal cross-section, which further improves the efficiency and accuracy that the optical signal can pass through the brightness enhancement film 240. The orientation of the lens structures 2402A on the microstructured surface of the first polymer layer 310 is substantially perpendicular to the orientation of the lens structures 2402B on the second polymer layer 320.
The lens structures 2402 on the microstructured surface of the first polymeric layer 310 and the lens structures 2402 on the second polymeric layer 320 each comprise a plurality of triangular prisms. Mesa structures 2403 on the microstructured surface of the first polymer layer 310 are not contiguously disposed between the plurality of lens structures 2402, where mesa structures 2403 and lens structures 2402 are arranged in an alternating array.
Example 2
Fig. 9 is a schematic cross-sectional view of a first polymer layer 310 and a second polymer layer 320 of a brightness enhancement film of a backlight module according to embodiment 2 of the present invention. Only the differences between embodiment 2 and embodiment 1 will be described, and the similarities will not be described herein, and only the lens structure 2402 and not the mesa structure 2403 are disposed on the second polymer layer 320 of the brightness enhancement film. At this time, the light can be condensed and diffused by the lens structure 2402 to homogenize the light emitted from the first polymer layer 310, thereby avoiding the uneven light (Mura).
Example 3
Fig. 10 is a schematic cross-sectional view of a first polymer layer 310 and a second polymer layer 320 of a brightness enhancement film of a backlight module according to embodiment 3 of the present invention. Only the differences between embodiment 3 and embodiment 1 will be described, and the similarities will not be described herein, the top surface of the first polymer layer 310 of the brightness enhancement film is provided with a mesa structure 2403A having a trapezoidal cross section, and the bottom surface of the first polymer layer 310 is provided with a mesa structure 2403B at a position opposite to the mesa structure 2403A. Here, the mesa structures 2403B and the first polymer layer 310 are made of the same material and are disposed in the gaps of the lens structure 2402 array.
The mesa structures 2403C on the second polymer layer 320 and the second polymer layer 320 are made of the same material and are disposed in the gaps of the lens structure 2402 array. Here, the mesa structure 2403B of the first polymer layer 310 corresponds to the mesa structure 2403C on the second polymer layer 320.
Example 4
Fig. 11 is a schematic cross-sectional view of a first polymer layer 310 and a second polymer layer 320 of a brightness enhancement film of a backlight module according to embodiment 4 of the present invention. Only the differences between embodiment 4 and embodiment 1 will be described, and the similarities will not be described herein, and the top and bottom surfaces of the first polymer layer 310 of the brightness enhancement film are provided with mesa structures 2403 with trapezoidal cross-sections, which are located oppositely. Here, the mesa structure 2403 is made of a different material from the first polymer layer 310, the index of refraction of the mesa structure 2403 is lower than that of the first polymer layer 310, and the mesa structure 2403 is disposed in a gap of the lens structure 2402 array.
The index of refraction of the mesa structures 2403 on the second polymer layer 320 is lower than that of the second polymer layer 320, and the mesa structures 2403 are disposed in the gaps of the array of lens structures 2402. Here, the mesa structure 2403 of the first polymer layer 310 corresponds to the mesa structure 2403 on the second polymer layer 320.
Example 5
Fig. 12 is a cross-sectional view of a first polymer layer 310 of a brightness enhancement film of a backlight module according to embodiment 5 of the present invention. Only the differences between embodiment 5 and embodiment 1 will be described, and the similarities will not be described herein, and the top surface of the first polymer layer 310 of the brightness enhancement film is provided with a cubic mesa structure 2403, which is located opposite to the top surface. Here, the mesa structure 2403 is made of a different material from the first polymer layer 310, the index of refraction of the mesa structure 2403 is lower than that of the first polymer layer 310, and the mesa structure 2403 is disposed in a gap of the lens structure 2402 array.
Referring to fig. 16, which is a plan view of the diffusion film 230 of embodiment 5 of the present invention, the diffusion units 2301 are distributed on the diffusion film 230 in stripes, so that the low haze region of the diffusion film 230 has a diffusion effect, and the low haze region is transparent, which can also improve the brightness of the backlight module.
Example 6
Fig. 13 is a cross-sectional view of a first polymer layer 310 of a brightness enhancement film of a backlight module according to embodiment 6 of the present invention. Only the differences between embodiment 5 and embodiment 1 will be described, and the similarities will not be described herein, the mesa structure 2403 with inverted trapezoid cross section is disposed on the upper surface of the first polymer layer 310 of the brightness enhancement film, and the mesa structure 2403 is disposed on the lens structure 2402 and fills the gaps of the array of lens structures 2402. Here, the mesa structure 2403 is the same material as the first polymer layer 310.
Fig. 17 is a plan view of a diffusion film 230 according to embodiment 6 of the present invention, which is provided with a low haze region 2320, and the haze of the low haze region 2320 is lower than that of other regions 2320 of the diffusion sheet. Alternatively, the diffuser haze increases in a radial gradient from its low haze region 2320 to other portions. Therefore, the low haze region 2320 of the diffusion sheet 230 has a diffusion effect, and the low haze region 2320 is transparent, so that the brightness of the backlight module can be improved.
Example 7
Fig. 6 is a cross-sectional view of a first polymer layer 310 of a brightness enhancement film of a backlight module according to embodiment 7 of the present invention. Only the differences between embodiment 7 and embodiment 1 will be described, and the similarities will not be described herein, and the mesa structure 2403 with a trapezoidal cross section is continuously disposed on the upper surface of the first polymer layer 310 of the brightness enhancement film. Here, the mesa structures 2403 are made of a different material from the substrate 2401 of the first polymer layer 310, the refractive index of the mesa structures 2403 is lower than that of the first polymer layer 310, and the array of mesa structures 2403 is disposed in the gaps of the array of lens structures 2402.
Example 8
Fig. 14 is a cross-sectional view of a first polymer layer 310 of a brightness enhancement film of a backlight module according to embodiment 8 of the present invention. Only the differences between embodiment 8 and embodiment 1 will be described, and the similarities will not be described herein, and the mesa structure 2403 with an inverted trapezoidal cross-section is embedded in the upper surface of the first polymer layer 310 of the brightness enhancement film. Here, the mesa structures 2403 are made of a different material from the substrate 2401 of the first polymer layer 310, the refractive index of the mesa structures 2403 is equal to the refractive index of the first polymer layer 310, and the array of mesa structures 2403 is disposed in the gaps of the array of lens structures 2402.
Example 9
Fig. 15 is a cross-sectional view of a first polymer layer 310 of a brightness enhancement film of a backlight module according to an embodiment 9 of the present invention. Only the differences between embodiment 9 and embodiment 1 will be described, and the similarities will not be described herein, and the mesa structure 2403 with a triangular cross-section is embedded in the upper surface of the first polymer layer 310 of the brightness enhancement film, and the mesa structure 2403 can be a triangular cone or a tetrahedron. Here, the mesa structure 2403 is made of a different material from the substrate 2401 of the first polymer layer 310, the refractive index of the mesa structure 2403 is equal to the refractive index of the first polymer layer 310, and the mesa structure 2403 is disposed in a gap of the array of lens structures 2402.
Claims (17)
1. A backlight module is characterized by comprising:
the backlight module comprises a light source, a light guide plate arranged on one side of the light source, a reflecting sheet arranged below the light guide plate, a diffusion sheet arranged above the light guide plate and a brightness enhancement film arranged above the diffusion sheet;
the surface of the brightness enhancement film is provided with a plurality of lens structures and a plurality of platform structures;
the platform structure comprises a platform part; and
the platform structure is arranged between the plurality of lens structures and/or above the plurality of lens structures, so that external light basically vertically penetrates through the plane of the brightness enhancement film.
2. A backlight module according to claim 1, wherein: the brightness enhancing film comprises a first high polymer layer and a second high polymer layer;
wherein the first polymer layer and the second polymer layer are disposed adjacent to each other;
the first polymer layer is provided with a microstructured surface, and the lens structure and the platform structure are arranged on the microstructured surface;
the second polymer layer is positioned between the first polymer layer and the diffusion sheet;
the surface of the second polymer layer is also provided with the lens structure.
3. A backlight module according to claim 2, wherein: an included angle between a plane of the platform and a plane of the microstructured surface is less than 10 °.
4. A backlight module according to claim 2, wherein: the width of the land is less than 1/2 of the minimum distance between adjacent lens structures.
5. A backlight module according to claim 2, wherein: the mesa structure has a refractive index substantially equal to a refractive index of the first polymer layer.
6. A backlight module according to claim 2, wherein: the mesa structure has a refractive index smaller than that of the first polymer layer.
7. A backlight module according to any of claims 2-6, characterized in that: the surface of the second polymer layer is also provided with the platform structure.
8. A backlight module according to claim 7, wherein: the orientation of the lens structures on the microstructured surface of the first polymeric layer is different from the orientation of the lens structures on the second polymeric layer.
9. A backlight module according to claim 8, wherein: the orientation of the lens structures on the microstructured surface of the first polymeric layer is substantially perpendicular to the orientation of the lens structures on the second polymeric layer.
10. A backlight module according to claim 2, wherein: the lens structures on the microstructured surface of the first polymeric layer and the lens structures on the second polymeric layer each comprise a plurality of triangular prisms or triangular-like prisms having rounded vertices.
11. A backlight module according to claim 1, wherein: the diffusion particles in the diffusion sheet are uniformly distributed in the diffusion sheet in a stripe shape or random point shape.
12. A backlight module according to claim 1, wherein: the diffusion sheet is provided with a low haze region having a haze lower than that of other regions of the diffusion sheet.
13. A backlight module according to claim 1, wherein: the backlight module also comprises an optical sensor element for transmitting and/or receiving the optical signal of the biological fingerprint; the biological fingerprint optical signal is infrared light or ultraviolet light.
14. A backlight module according to claim 13, wherein: the optical sensor element is disposed between the light guide plate and the reflective sheet.
15. A backlight module according to claim 13, wherein: the optical sensor element is disposed below the reflective sheet.
16. A backlight module according to claim 13, wherein: the optical sensor element is embedded in the reflector plate.
17. A backlight module according to claim 13, wherein: the optical sensor element is arranged above the brightness enhancement film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920623609.2U CN210109513U (en) | 2019-04-30 | 2019-04-30 | Backlight module for fingerprint identification in LCD screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920623609.2U CN210109513U (en) | 2019-04-30 | 2019-04-30 | Backlight module for fingerprint identification in LCD screen |
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| CN210109513U true CN210109513U (en) | 2020-02-21 |
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| CN201920623609.2U Active CN210109513U (en) | 2019-04-30 | 2019-04-30 | Backlight module for fingerprint identification in LCD screen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068957A (en) * | 2019-04-30 | 2019-07-30 | 深圳市隆利科技股份有限公司 | Backlight module and LCD display device for fingerprint recognition in LCD screen |
| CN114594629A (en) * | 2022-04-15 | 2022-06-07 | 武汉华星光电技术有限公司 | Fingerprint identification display panel and device |
-
2019
- 2019-04-30 CN CN201920623609.2U patent/CN210109513U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068957A (en) * | 2019-04-30 | 2019-07-30 | 深圳市隆利科技股份有限公司 | Backlight module and LCD display device for fingerprint recognition in LCD screen |
| CN114594629A (en) * | 2022-04-15 | 2022-06-07 | 武汉华星光电技术有限公司 | Fingerprint identification display panel and device |
| CN114594629B (en) * | 2022-04-15 | 2023-12-08 | 武汉华星光电技术有限公司 | Fingerprint identification display panel and device |
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