CN113759595A - Backlight structure and display device - Google Patents

Backlight structure and display device Download PDF

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Publication number
CN113759595A
CN113759595A CN202010502465.2A CN202010502465A CN113759595A CN 113759595 A CN113759595 A CN 113759595A CN 202010502465 A CN202010502465 A CN 202010502465A CN 113759595 A CN113759595 A CN 113759595A
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CN
China
Prior art keywords
backlight
hole
module
display device
infrared light
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Withdrawn
Application number
CN202010502465.2A
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Chinese (zh)
Inventor
李阳
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ZTE Corp
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ZTE Corp
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Priority to CN202010502465.2A priority Critical patent/CN113759595A/en
Priority to PCT/CN2021/096878 priority patent/WO2021244436A1/en
Publication of CN113759595A publication Critical patent/CN113759595A/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention discloses and provides a backlight structure, which belongs to the technical field of display, and is applied to a display device, wherein the display device comprises a fingerprint identification area and a display area surrounding the fingerprint identification area; the backlight structure comprises a backlight module and a back shell for fixing the backlight module; the back shell is provided with a first through hole and at least one second through hole surrounding the first through hole; the first through hole is positioned in the fingerprint identification area; the backlight structure further includes: the infrared light-emitting modules are arranged in one-to-one correspondence with the second through holes and are fixed at the positions of the second through holes; when the backlight structure is applied to the display device, infrared light emitted by the infrared light emitting module can irradiate the fingerprint sensor through the first through hole after irradiating the finger pressing the fingerprint identification area, so as to perform fingerprint identification. The present disclosure also provides a display device.

Description

Backlight structure and display device
Technical Field
The invention relates to the technical field of display, in particular to a backlight structure and a display device.
Background
The existing smart phone has three fingerprints, namely a capacitive fingerprint module, an ultrasonic fingerprint module and an optical fingerprint module, the most applied fingerprints of the three fingerprints are capacitive fingerprints, the cost is low, the effect is good, if the capacitive fingerprint module is placed on the back of the phone, the integration of the phone shell is not facilitated, if the capacitive fingerprint module is placed on the front, the implementation of the front full-face screen is not facilitated, if the capacitive fingerprint module is integrated into a Display screen, the capacitive fingerprint module is influenced by a cover plate, the recognition rate is reduced, the power consumption of the lower fingerprint of the ultrasonic screen is high, the lower fingerprint of the optical screen can only be matched with an Organic Light-Emitting Diode (OLED) Display device for use at present, because the OLED Display device can realize high visible Light transmittance, and can provide high brightness through brightness mode selection, so that the fingerprint module can obtain clear fingerprint images, but the OLED Display device has high cost compared with an LCD (Liquid Crystal Display device), and long-term use of the high-brightness mode can cause the service life of the OLED to be reduced, so that realizing the lower fingerprints of the LCD screen is a more cost-effective scheme.
Disclosure of Invention
The present invention provides a backlight structure and a display device.
In order to achieve the above object, an embodiment of the present invention provides a backlight structure, which is applied in a display device, where the display device includes a fingerprint identification area and a display area surrounding the fingerprint identification area; the backlight structure comprises a backlight module and a back shell for fixing the backlight module; the back shell is provided with a first through hole and at least one second through hole surrounding the first through hole; the first through hole is positioned in the fingerprint identification area; the backlight structure further includes:
the infrared light-emitting modules are arranged in one-to-one correspondence with the second through holes and are fixed at the positions of the second through holes;
when the backlight structure is applied to the display device, infrared light emitted by the infrared light emitting module can irradiate the fingerprint sensor through the first through hole after irradiating the finger pressing the fingerprint identification area, so as to perform fingerprint identification.
Optionally, the infrared light emitting module is fixed to the back shell through a light shielding adhesive and corresponds to the second through hole.
Optionally, the infrared light emitting module includes an infrared flexible circuit board, and an infrared LED connected to the flexible circuit board; wherein the content of the first and second substances,
the flexible circuit board is fixed on one side, deviating from the backlight module, of the back shell through the shading glue, and the infrared LED is limited in the second through hole.
Optionally, the backlight module includes: the edge deviates from reflective membrane, light guide plate and optics diaphragm that infrared light emitting module one side set gradually, and be located the LED lamp strip of at least one side of light guide plate.
Optionally, the LED light bar includes a backlight flexible circuit board, and a backlight LED connected to the backlight flexible circuit board; wherein the content of the first and second substances,
the backlight flexible circuit board is fixed on the light guide plate and the back shell through shading glue, and a shading layer is coated on one side, deviating from the backlight LED, of the backlight flexible circuit board.
Optionally, the backlight module includes: and the LED surface light source and the optical diaphragm are sequentially arranged along one side departing from the infrared light-emitting module.
Optionally, the optical film comprises: at least one of a diffusion film, an upper brightness enhancement film, and a lower brightness enhancement film.
Optionally, when the optical film includes the diffusion film, the upper brightness enhancement film and the lower brightness enhancement film, the diffusion film, the upper brightness enhancement film and the lower brightness enhancement film are sequentially arranged along one side away from the infrared light emitting module.
An embodiment of the present invention provides a display device, which includes the backlight structure as claimed above, and a display module located on the light-emitting surface side of the backlight structure.
Optionally, the display device further includes a middle frame and a fingerprint sensor located on a side of the back shell facing away from the backlight module;
a third through hole is formed in the middle frame, and corresponds to the second through hole in position; the fingerprint identification sensor is fixed at the position of the third through hole of the middle frame.
The invention has the following beneficial effects:
in the embodiment of the disclosure, the infrared light emitting module in the fingerprint identification component is integrated on the back shell of the backlight structure, so that a through hole for emitting infrared light emitted by the infrared light emitting module is not required to be arranged on the middle frame, the number of the through holes on the middle frame is greatly reduced, and the strength of the whole structure can be increased. Simultaneously, when backlight structure was applied to among the display device, the backshell was closer to display module assembly than display device's center, so than correlation technique, when the finger pressed display device, infrared light that infrared light emitting module sent shines to the finger to fingerprint sensor's optical path via the finger transmission shortens, thereby makes the light intensity increase of the infrared light that fingerprint sensor received, and then can promote the imaging of fingerprint effect, improves fingerprint identification's precision.
Drawings
FIG. 1 is a region distribution diagram of a display device according to an embodiment of the disclosure;
FIG. 2 is a cross-sectional view A-A' of FIG. 1;
FIG. 3 is a schematic diagram of a backlight structure according to an embodiment of the disclosure;
FIG. 4 is an enlarged view of the structure of the first and second via locations of FIG. 3;
fig. 5 is a sectional view of B-B' of fig. 4.
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.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The display device comprises a display module, a backlight structure, a middle frame and a fingerprint identification assembly, wherein the backlight structure is located on one side, deviating from the display surface, of the display module, the middle frame is located on one side, deviating from the display module, of the backlight structure, and the fingerprint identification assembly is located on one side, deviating from the backlight structure, of the middle frame. The backlight structure comprises a backlight module and a back shell, wherein the back shell is positioned on one side of the backlight module, which is far away from the display module; the fingerprint identification component comprises an infrared light-emitting module and a fingerprint sensor; the back shell and the middle frame are provided with first through holes corresponding to the positions of the fingerprint identification sensors, and second through holes corresponding to the positions of the infrared light emitting modules; when a user touches the display device with a finger, infrared light emitted by the infrared light emitting module irradiates to the user finger through the second through hole on the back shell and the middle frame, and then irradiates to the fingerprint sensor through the first through hole on the back shell and the middle frame after being emitted by the user finger, the fingerprint sensor acquires a fingerprint image of the user according to the intensity of the received infrared light, the identified fingerprint image is compared with a pre-stored fingerprint image, if the two fingerprint images are matched, other operations of the display device can be executed, otherwise, the operation is not executed.
The invention discovers that the first through holes and the second through holes are formed in the back shell and the middle frame, so that the number of the through holes is large for the display panel, and particularly, the structural strength of the whole machine is greatly reduced due to the large number of the through holes in the middle frame.
In order to solve the technical problem, the embodiments of the present disclosure provide the following technical solutions.
In a first aspect, as shown in fig. 1-5, embodiments of the present disclosure provide a backlight structure, which is applied to a display device, where the display device includes a fingerprint identification area Q2 and a display area Q1 surrounding a fingerprint identification area Q2. The backlight structure in the embodiment of the present disclosure includes a backlight module, a back case 10 for fixing the backlight module, and an infrared light emitting module fixed on the back case 10. The back shell 10 is provided with a first through hole 11 and at least one second through hole 12 surrounding the first through hole 11; wherein the first through hole 11 is located in the fingerprint identification area Q2; the backlight structure further includes: the infrared light-emitting modules and the second through holes are arranged in a one-to-one correspondence manner and are fixed at the positions of the second through holes 12; when the backlight structure is applied to a display device, infrared light emitted by the infrared light emitting module can be irradiated to a fingerprint sensor through the first through hole 11 after being irradiated to a finger pressing the fingerprint identification area Q2, so as to perform fingerprint identification.
In the embodiment of the present disclosure, the infrared light emitting module in the fingerprint identification module is integrated on the back shell 10 of the backlight structure, so that there is no need to provide a through hole for emitting infrared light emitted by the infrared light emitting module on the middle frame, thereby greatly reducing the number of the through holes on the middle frame, and further increasing the strength of the whole structure. Simultaneously, when backlight structure was applied to among the display device, dorsal scale 10 was closer to display module assembly than display device's center, so than correlation technique, when the finger pressed display device, infrared light that infrared light emitting module sent shined to the finger to fingerprint sensor's optical path via the finger transmission shortens, thereby makes the light intensity increase of the infrared light that fingerprint sensor received, and then can promote the imaging of fingerprint effect, improves fingerprint identification's precision.
In some embodiments, the shape of the first and second through holes 11 and 12 includes, but is not limited to, circular, elliptical, square. The shape of the first through hole 11 is not limited in the embodiments of the present disclosure, and only the first through hole 11 and the second through hole 12 are illustrated as being circular in the following description.
In some embodiments, the number of the first through holes 11 and the second through holes 12 may be one or more; since the strength of the whole machine is affected by the excessive number of the through holes, the number of the first through holes 11 is preferably one in the embodiment of the present disclosure. In the embodiment of the present disclosure, the number of the first through holes 11 is one, and the number of the second through holes 12 is plural; wherein the second through holes 12 are arranged along the circumferential direction of the first through holes 11. Since the infrared light emitting modules are arranged in one-to-one correspondence with the second through holes 12, preferably, the second through holes 12 are uniformly arranged in the circumferential direction of the first through hole 11 to ensure that the infrared light received by the finger is uniform. As shown in fig. 3, the back shell 10 is provided with four second through holes 12, and the four second through holes 12 are uniformly arranged in the circumferential direction of the first through hole 11. It should be understood that the number of the second through holes 12 provided in the back case 10 is not limited to four, and the number of the second through holes 12 may be specifically set according to the size of the display device and the like.
In some embodiments, as shown in fig. 4 and 5, the infrared light emitting module includes an infrared LED101 and an infrared flexible wiring board 102; the infrared LED101 is connected to the infrared flexible circuit board 102; the infrared flexible wiring board 102 provides an infrared light driving signal to the infrared LED 101. The infrared LEDs 101 and the second through holes 12 are arranged in a one-to-one correspondence, and the infrared flexible circuit board 102 is attached to one side of the back shell 10 away from the backlight module through a light-shielding adhesive. The reason why the light-shielding adhesive 31 is used to fix the infrared flexible circuit board 102 on the back shell 10 is to prevent the infrared light emitted by the infrared LED101 from leaking light from the second through hole 12 and irradiating the fingerprint recognition sensor, which weakens the light intensity irradiating the finger and causes inaccurate fingerprint recognition.
In addition, in some embodiments, as shown in fig. 4, the infrared flexible printed circuits 102 connected to the respective infrared LEDs 101 are shared, so that the backlight structure is simpler, and the infrared LEDs 101 emit light simultaneously in the fingerprint identification stage, so that the time sequence can be simplified by sharing the infrared flexible printed circuits 102 connected to the respective LEDs. Of course, the infrared flexible printed circuit board 102 in each infrared light emitting module may be separately disposed.
In some embodiments, as shown in fig. 2, the backlight module is a side-in type backlight module; the backlight module comprises a reflecting layer 21, a light guide plate 22 and an optical film which are sequentially arranged along the direction departing from the back shell 10, and an LED lamp strip arranged on at least one side edge of the light guide plate 22. The light emitted by the LED light bar is irradiated to the light guide plate 22, reflected by the reflective layer 21, and then diffused by the optical film to provide a backlight source for the display module.
In some embodiments, when the backlight module is a side-in type backlight module, the optical film comprises at least one of a diffusion film 23, an upper brightness enhancement film 25, and a lower brightness enhancement film 24. As an example, the optical film includes a diffusion film 23, a lower brightness enhancement film 24, and an upper brightness enhancement film 25, which are sequentially disposed in a direction away from the light guide plate 22. The light guide plate 22, the diffusion film 23, the lower brightness enhancement film 24, and the upper brightness enhancement film 25 are stacked.
In some embodiments, when the backlight module is a side-in type backlight module, the LED light bar includes a backlight LED201 and a backlight flexible circuit board 202; the backlight LED201 is connected to the backlight flexible circuit board 202. The backlight flexible wiring board 202 is fixed between the side of the light guide plate 22 and the side wall of the back case 10 by the light shielding adhesive 32. The light shielding layer 33 is disposed on a side of the backlight flexible circuit board 202 away from the backlight LED201, one side of the light shielding layer 33 abuts against the backlight sidewall, and the other side extends to the edge of the optical film, so as to avoid light leakage of light emitted by the backlight LED 201. The light shielding layer 33 may also be made of a light shielding adhesive, and the material of the light shielding layer 33 is not limited to the light shielding adhesive and may be other film layers with a light shielding function.
In some embodiments, the backlight module is a direct type backlight module, and the direct type backlight module comprises an LED surface light source and an optical film arranged on one side of the LED surface light source, which is far away from the infrared light emitting module; the optical film is used for diffusing the light emitted by the LED surface light source.
In some embodiments, when the backlight module is a direct-type backlight module, the optical film includes at least one of a diffuser film 23, an upper brightness enhancement film 25, and a lower brightness enhancement film 24. As an example, the optical film includes a diffusion film 23, a lower brightness enhancement film 24, and an upper brightness enhancement film 25, which are sequentially disposed in a direction away from the light guide plate 22. The light guide plate 22, the diffusion film 23, the lower brightness enhancement film 24, and the upper brightness enhancement film 25 are stacked.
In some embodiments, the back shell 10 in the embodiments of the present disclosure may be an iron frame or a rubber frame.
In a second aspect, an embodiment of the present disclosure provides a display device, where the display device is a liquid crystal display device, and may be a user equipment with a real-world display function, such as a mobile phone and a tablet computer. The display device in the embodiment of the disclosure comprises the backlight structure and the display module, so that the display device can realize a fingerprint identification function, and the structural performance of the whole display device is better.
In some embodiments, the display device not only includes the above structure, but also includes a middle frame located on a side of the back shell 10 away from the display module, and a third through hole is provided on the middle frame, and the third through hole is provided corresponding to the first through hole 11. Deviating from display module assembly's side at the center, and be provided with fingerprint sensor with the position that the third through-hole corresponds, the infrared light that infrared light emitting module sent shines to pressing behind fingerprint identification district Q2's the finger, can shine to fingerprint sensor via first through-hole 11 and third through-hole to carry out fingerprint identification.
In some embodiments, the orthographic projections of the first through hole 11 on the back shell 10 and the third through hole on the middle frame on the plane of the display module are completely overlapped. It should be noted here that the sizes of the first through hole 11 and the third through hole preferably satisfy the minimum size when the infrared light reflected by the finger is totally irradiated onto the fingerprint recognition device. Therefore, the influence on the strength of the whole structure caused by the oversize of one of the first through hole 11 on the back shell 10 and the third through hole on the middle frame is avoided.
In some embodiments, the display module includes a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate. The liquid crystal layer deflects under the action of an electric field generated between the first substrate and the second substrate, and light emitted by the backlight module passes through the liquid crystal layer at the moment, so that display of different gray scales is realized. The first substrate may be an array substrate, and the second substrate may be a color film substrate.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present invention are intended to be within the scope of the claims.

Claims (10)

1. A backlight structure is applied to a display device, and the display device comprises a fingerprint identification area and a display area surrounding the fingerprint identification area; the backlight structure comprises a backlight module and a back shell for fixing the backlight module; the back shell is characterized in that the back shell is provided with a first through hole and at least one second through hole surrounding the first through hole; the first through hole is positioned in the fingerprint identification area; the backlight structure further includes:
the infrared light-emitting modules are arranged in one-to-one correspondence with the second through holes and are fixed at the positions of the second through holes;
when the backlight structure is applied to the display device, infrared light emitted by the infrared light emitting module can irradiate the fingerprint sensor through the first through hole after irradiating the finger pressing the fingerprint identification area, so as to perform fingerprint identification.
2. The backlight structure of claim 1, wherein the infrared light emitting module is fixed on the back shell at a position corresponding to the second through hole by a light shielding adhesive.
3. The backlight structure according to claim 2, wherein the infrared light emitting module comprises an infrared flexible wiring board, and an infrared LED connected to the flexible wiring board; wherein the content of the first and second substances,
the flexible circuit board is fixed on one side, deviating from the backlight module, of the back shell through the shading glue, and the infrared LED is limited in the second through hole.
4. The backlight structure according to claim 1, wherein the backlight module comprises: the edge deviates from reflective membrane, light guide plate and optics diaphragm that infrared light emitting module one side set gradually, and be located the LED lamp strip of at least one side of light guide plate.
5. The backlight structure of claim 4, wherein the LED light bar comprises a backlight flexible circuit board, and backlight LEDs connected to the backlight flexible circuit board; wherein the content of the first and second substances,
the backlight flexible circuit board is fixed on the light guide plate and the back shell through shading glue, and a shading layer is coated on one side, deviating from the backlight LED, of the backlight flexible circuit board.
6. The backlight structure according to claim 4, wherein the backlight module comprises: and the LED surface light source and the optical diaphragm are sequentially arranged along one side departing from the infrared light-emitting module.
7. The backlight structures defined in claim 4 or claim 6 wherein the optical film comprises: at least one of a diffusion film, an upper brightness enhancement film, and a lower brightness enhancement film.
8. The backlight structure of claim 7, wherein when the optical film comprises the diffuser film, the upper brightness enhancement film and the lower brightness enhancement film, the diffuser film, the upper brightness enhancement film and the lower brightness enhancement film are sequentially disposed along a side away from the infrared light emitting module.
9. A display device, comprising the backlight structure of any one of claims 1-8, and a display module located at a light exit surface side of the backlight structure.
10. The display device according to claim 9, further comprising a middle frame and a fingerprint sensor on a side of the back case facing away from the backlight module;
a third through hole is formed in the middle frame, and corresponds to the second through hole in position; the fingerprint identification sensor is fixed at the position of the third through hole of the middle frame.
CN202010502465.2A 2020-06-03 2020-06-03 Backlight structure and display device Withdrawn CN113759595A (en)

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