CN110865489B - Backlight structure and display device - Google Patents
Backlight structure and display device Download PDFInfo
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- CN110865489B CN110865489B CN201911202422.6A CN201911202422A CN110865489B CN 110865489 B CN110865489 B CN 110865489B CN 201911202422 A CN201911202422 A CN 201911202422A CN 110865489 B CN110865489 B CN 110865489B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a backlight structure and a display device, wherein MiniLed light-emitting units are arranged around a light hole of the backlight structure, and a fingerprint sensitive chip is arranged between the MiniLed light-emitting units, so that fingerprint identification can be realized around the light hole. When the display device provided by the invention needs to start the display function, the special-shaped area uses the MiniLed light-emitting unit as a backlight source, and the upper liquid crystal box adjusts the light and the light gathering and guiding ring above the light hole can realize simple picture display of the special-shaped area. When the photographing function needs to be started, the MiniLed light-emitting unit is closed, and the liquid crystal box is in a transparent state, so that the camera enters light to photograph. When the fingerprint unlocking function needs to be started, the upper liquid crystal box is in a transparent state, corresponding single-color MiniLed (a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit) is started according to a visible light wave band (red light, green light or blue light) which can be identified by the fingerprint photosensitive chip, and after the unlocking is successful, the single-color MiniLed is closed and the special-shaped area display function is normally started.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight structure and a display device.
Background
The technology of identifying fingerprints under an optical screen is currently a hot spot pursued by the market, and the Liquid Crystal Display (Liquid Crystal Display) has great difficulty in designing optical fingerprint light paths and arranging sensors in a Display area due to low penetration rate, dimming function of a Liquid Crystal light valve and a complex laminated framework. At present, no reasonable commercialized technology for identifying fingerprints under LCD screens is provided in the market. The optical fingerprint identification technology under the screen is taken as a pre-research technology combining the follow-up artificial intelligence and the display technology, and is well seen by many manufacturers. How to design reasonable optical fingerprint light path and mechanism under LCD screen becomes the key of success or failure of the technology.
Therefore, it is desirable to provide a backlight structure and a display device for implementing fingerprint identification in a camera area.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a backlight structure and a display device, in which a MiniLed light emitting unit is disposed around a light transmitting hole of the backlight structure, and a fingerprint sensing chip is disposed between the MiniLed light emitting units, thereby enabling fingerprint recognition around the light transmitting hole.
The present invention provides a backlight structure, including: a light hole; the MiniLed substrate is arranged around the light holes, a plurality of MiniLed light-emitting units are arranged on the MiniLed substrate, and a photosensitive chip is arranged between every two adjacent MiniLed light-emitting units; a light guide plate surrounding the MiniLed substrate;
the packaging layer is arranged on the MiniLed substrate, the MiniLed light-emitting unit and the fingerprint photosensitive chip; and a backlight source.
Further, the method also comprises the following steps: and the light guide ring is arranged between the MiniLed substrate and the light holes and surrounds the light holes.
Further, the MiniLed light emitting unit includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit.
Further, the method also comprises the following steps: the reflector plate and the MiniLed substrate are arranged on the same layer, and the light guide plate is arranged on the reflector plate; the diffusion sheet is arranged on the light guide plate; the lower prism film is arranged on the diffusion sheet; and the upper prism film is arranged on the lower prism film.
Further, the backlight source comprises a side-in type backlight source or a direct type backlight source.
Further, the MiniLed substrate includes: a metal layer; at least three mixed layers arranged on one side of the metal layer, wherein each mixed layer comprises a metal wire and a base material; the base material is arranged on one side of the metal wire; and the white ink is arranged on one side of the mixed layer, which is far away from the metal layer.
Further, still include: the baffle is arranged between the MiniLed substrate and the light guide plate and is perpendicular to the light guide plate.
The invention further provides a display device, which comprises the backlight structure.
Further, the display device further includes: the camera is arranged below the backlight structure and corresponds to the light holes; and the liquid crystal box is arranged above the backlight structure.
Further, the liquid crystal cell corresponding to the camera includes a polymer dispersion liquid crystal cell or a polymer mesh liquid crystal cell.
The invention has the beneficial effects that: the invention provides a backlight structure and a display device, wherein MiniLed light-emitting units are arranged around a light hole of the backlight structure, and a fingerprint sensitive chip is arranged between the MiniLed light-emitting units, so that fingerprint identification can be realized around the light hole. When the display device provided by the invention needs to start the display function, the special-shaped area uses the MiniLed light-emitting unit as a backlight source, and the upper liquid crystal box adjusts the light and the light gathering and guiding ring above the light hole can realize simple picture display of the special-shaped area. When the photographing function needs to be started, the MiniLed light-emitting unit is closed, and the liquid crystal box is in a transparent state, so that the camera enters light to photograph. When the fingerprint unlocking function needs to be started, the upper liquid crystal box is in a transparent state, corresponding single-color MiniLed (a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit) is started according to a visible light wave band (red light, green light or blue light) which can be identified by the fingerprint photosensitive chip, and after the unlocking is successful, the single-color MiniLed is closed and the special-shaped area display function is normally started.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic structural diagram of a portion of a backlight structure provided in the present invention;
FIG. 2 is a plan view of a grooved screen provided by the present invention;
FIG. 3 is a plan view of a drip screen provided by the present invention;
fig. 4 is a schematic structural diagram of a MiniLed substrate provided in the present invention;
fig. 5 is a schematic structural diagram of a display device provided in the present invention.
The figures in the above drawings are numbered:
a backlight structure 100; a display device 200;
a light-transmitting hole 101; a MiniLed substrate 102; a light guide ring 103;
a light guide plate 104; an encapsulation layer 106; a backlight 105;
a MiniLed light emitting unit 107; a fingerprint sensing chip 108;
a reflective sheet 109; a diffusion sheet 1010; a lower prism film 1011;
an upper prism film 1012; a baffle 1013; a liquid crystal cell 201;
a camera 202.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. Directional phrases used herein, such as, for example, upper, lower, front, rear, left, right, inner, outer, lateral, etc., refer only to the orientation of the accompanying drawings. The names of the elements, such as the first, the second, etc., mentioned in the present invention are only used for distinguishing different elements and can be better expressed. In the drawings, elements having similar structures are denoted by the same reference numerals.
Embodiments of the present invention will be described in detail herein with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided to explain the practical application of the invention and to enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.
As shown in fig. 1, the present invention provides a backlight structure 100, comprising: a light hole 101, a MiniLed substrate 102, a light guide ring 103, a light guide plate 104, an encapsulation layer 106, and a backlight 105.
The light hole 101 is used for enabling external light to penetrate through, and the sensor module below the light hole 101 is convenient to collect the external light.
The light transmission holes 101 are formed in the irregular regions of the panel, i.e., the groove screen (110 in fig. 2) and the drip screen (120 in fig. 3), which are popular in the market.
The MiniLed substrate 102 surrounds the light hole 101, a plurality of MiniLed light-emitting units 107 are arranged on the MiniLed substrate 102, and a fingerprint sensing chip 108 is arranged between every two adjacent MiniLed light-emitting units 107.
The MiniLed light emitting unit 107 includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit. The spacing between adjacent MiniLed light emitting units 107 is 2-4 mm.
The number of the fingerprint photosensitive chips 108 is 1-100, the fingerprint photosensitive chips 108 can randomly select a photosensitive wave band in a visible light area, and the MiniLed light-emitting units 107 and the fingerprint photosensitive chips 108 are sealed by transparent protective glue to form the packaging layers 106, so that the working stability of the chips is ensured.
In the manufacturing process, the Surface Mount Technology (SMT) process is firstly adopted on the MiniLed substrate 102 to complete the component printing of the fingerprint photosensitive chip 108, then the die bonding process is utilized to complete the component printing of the MiniLed light-emitting unit 107 on the substrate, and the sealing process is performed after reflow soldering.
As shown in fig. 4, the MiniLed substrate 102 includes: a metal layer 1021, a hybrid layer 1029, and white ink 1028.
The metal layer 1021 is preferably copper.
The mixed layer 1029 is arranged on one side of the metal layer 1021, the mixed layer 1029 comprises a metal wire 1023 and a substrate 1022, the metal wire 1023 is arranged on the substrate 1022, the metal wire 1023 is preferably made of copper, and the substrate 1022 is made of glass fiber epoxy resin copper-clad plates, polyimide and resin.
The white ink 1028 is disposed on a side of the mixed layer away from the metal layer.
The mixed layer 1029 has at least 3 layers, which is to independently control the emission of the MiniLed light emitting unit 107 of three colors, and preferably 5 layers according to the present invention.
Specifically, 5 mixed layers 1029 are stacked on the metal layer 1021, each mixed layer 1029 having metal lines 1023, a first metal line 1024, a second metal line 1025, a third metal line 1026, and a fourth metal line 1027, which are insulated from each other by a substrate.
The fourth metal line 1027 is a solder trace of the backlight 105, the third metal line 1026 is a solder trace of the front fingerprint sensor chip 108, and the second metal line 1025, the first metal line 1024, and the metal line 1023 are back traces of the red light emitting unit, the green light emitting unit, and the blue light emitting unit, respectively. Since the MiniLed light emitting units 107 of different colors need to independently control light emission, at least 3 layers of copper wires need to be used for wiring. The metal layer 1021 is used for wiring on the back of the fingerprint sensing chip 108, so that the fingerprint sensing chip 108 can realize a normal sensing function.
The fingerprint sensing chip 108 can receive fingerprints, and further fingerprint identification can be achieved, and the fingerprint sensing chip 108 is arranged around the light hole 101 (special-shaped area), so that camera shooting and fingerprint identification can be achieved.
And because the light trap 101 of the setting in dysmorphism district, the regional module transmissivity of dysmorphism is higher, and structural design is simple, easily reaches into higher fingerprint unblock effect.
The encapsulation layer 106 is disposed on the MiniLed substrate 102, the MiniLed light emitting unit 107, and the fingerprint sensing chip 108.
The light guide plate 104 surrounds the MiniLed substrate 102 and is disposed mainly in the display region.
The backlight 105 comprises a side-lit backlight or a direct-lit backlight. The present invention is preferably a side-lit backlight, and in other embodiments may also be a direct-lit backlight.
The backlight 105 is disposed at a side of the light guide plate 104 for providing light to the panel in the display area.
The light guide ring 103 is disposed between the MiniLed substrate 102 and the light hole 101 and surrounds the light hole 101. The light guide ring 103 can realize uniform light emission at the position above the light transmission hole 101.
The backlight structure 100 further includes: a reflection sheet 109, a diffusion sheet 1010, a lower prism film 1011, an upper prism film 1012, and a baffle 1013.
The reflective sheet 109 and the MiniLed substrate 102 are disposed on the same layer, the light guide plate 104 is disposed on the reflective sheet 109, and the reflective sheet 109 is used for reflecting the tube light of the backlight 105 to the light guide plate 104.
The diffusion sheet 1010 is arranged on the light guide plate 104; the lower prism film 1011 is disposed on the diffusion sheet 1010; the upper prism film 1012 is disposed on the lower prism film 1011.
The diffusion sheet 1010, the lower prism film 1011, and the upper prism film 1012 are used to uniformly diffuse light to the display area.
The baffle 1013 is disposed between the MiniLed substrate 102 and the light guide plate 104 and perpendicular to the light guide plate 104. The baffle 1013 is used to distinguish MiniLed backlight of the special-shaped area from backlight of the display area, so as to prevent mutual influence.
The invention also provides a display device 200, which comprises the backlight structure 100, a camera 202 and a liquid crystal cell 201.
The camera 202 is disposed under the backlight structure 100 and corresponds to the light hole 101. The liquid crystal cell 201 is disposed on the backlight structure 100.
The liquid crystal cell corresponding to the camera 202 includes a polymer dispersed liquid crystal cell or a polymer network liquid crystal cell, and the other region is a general liquid crystal cell. The liquid crystal cell 201 can be switched between the fog state and the transparent state by controlling the voltage, so that the display and photographing functions can be switched.
When the power is not applied, the refractive indexes of the liquid crystal molecules and the polymer molecules in the direction of the optical vector are the same, and the liquid crystal cell 201 is in a transparent state; when electricity is applied, the liquid crystal molecules and the polymer molecules have different refractive indexes in the direction of the light vector and are in a scattering state.
As shown in fig. 5, in the display device 200 provided by the present invention, when the display function needs to be turned on, the MiniLed light emitting unit 107 is used as the backlight source 105 in the special-shaped area, and the PDLC/PNLC liquid crystal cell 201 above is used for dimming and the light collecting ring 103 above the light transmitting hole 101 is used for realizing simple screen display in the special-shaped area. When the photographing function needs to be turned on, the MiniLed light-emitting unit 107 is turned off, and the liquid crystal cell 201 is in a transparent state, so that the camera 202 enters light for photographing. When the fingerprint unlocking function needs to be started, the upper liquid crystal box 201 is in a transparent state, corresponding single-color MiniLed (a red light emitting unit, a green light emitting unit and a blue light emitting unit) is started according to a visible light wave band (red light, green light or blue light) recognizable by the photosensitive chip, the brightness of the MiniLed is modulated to be more than 10000nits, so that the limited number of photosensitive chips can receive enough finger reflection light, and the single-color MiniLed is closed and the special-shaped area display function is normally started after the unlocking is successful.
It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible without limiting the invention to the specific examples of the above embodiments. The above examples are intended to be illustrative of the invention and are not intended to be limiting. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.
Claims (7)
1. A backlight structure, comprising:
a light hole;
the MiniLed substrate is arranged around the light holes, a plurality of MiniLed light-emitting units are arranged on the MiniLed substrate, and a fingerprint photosensitive chip is arranged between every two adjacent MiniLed light-emitting units;
a light guide plate surrounding the MiniLed substrate;
the encapsulation layer is arranged on the MiniLed substrate, the MiniLed light-emitting unit and the fingerprint photosensitive chip; and
a backlight source;
further comprising:
the light guide ring is arranged between the MiniLed substrate and the light holes and surrounds the light holes;
the MiniLed light-emitting unit comprises a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit;
the MiniLed substrate comprises:
a metal layer;
the five mixed layers are arranged on one side of the metal layer and comprise metal wires and base materials, each mixed layer is provided with the metal wires which are respectively a metal wire, a first metal wire, a second metal wire, a third metal wire and a fourth metal wire, and the adjacent mixed layers are mutually insulated through the base materials;
the white ink is arranged on one side, far away from the metal layer, of the mixed layer;
the fourth metal wire is a welding wire of the backlight source, the third metal wire is a welding wire of the fingerprint photosensitive chip, the second metal wire, the first metal wire and the metal wire are respectively back wires of the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit, and the metal layer is back wire of the fingerprint photosensitive chip.
2. The backlight structure according to claim 1, further comprising:
the reflector plate and the MiniLed substrate are arranged on the same layer, and the light guide plate is arranged on the reflector plate;
the diffusion sheet is arranged on the light guide plate;
the lower prism film is arranged on the diffusion sheet;
and the upper prism film is arranged on the lower prism film.
3. The backlight structure of claim 1,
the backlight source comprises a side-in type backlight source or a direct type backlight source.
4. The backlight structure according to claim 1, further comprising:
the baffle is arranged between the MiniLed substrate and the light guide plate and is perpendicular to the light guide plate.
5. A display device comprising the backlight structure according to any one of claims 1 to 4.
6. The display device according to claim 5, further comprising:
the camera is arranged below the backlight structure and corresponds to the light holes;
and the liquid crystal box is arranged above the backlight structure.
7. The display device according to claim 6,
the liquid crystal cell corresponding to the camera includes a polymer dispersion liquid crystal cell or a polymer mesh liquid crystal cell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911202422.6A CN110865489B (en) | 2019-11-29 | 2019-11-29 | Backlight structure and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911202422.6A CN110865489B (en) | 2019-11-29 | 2019-11-29 | Backlight structure and display device |
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| CN110865489A CN110865489A (en) | 2020-03-06 |
| CN110865489B true CN110865489B (en) | 2022-09-27 |
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| CN111679478B (en) * | 2020-06-29 | 2022-08-05 | 武汉华星光电技术有限公司 | Liquid crystal display device |
| CN113744641B (en) * | 2021-08-19 | 2023-04-18 | 惠州华星光电显示有限公司 | Display device |
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| CN108427228B (en) * | 2018-02-24 | 2021-03-16 | 武汉天马微电子有限公司 | Backlight module and display device |
| KR102604286B1 (en) * | 2018-05-25 | 2023-11-20 | 삼성전자주식회사 | Display including filling member separated from photo-curable member to form space through which light for photo-curing travels, and electronic device including the same |
| CN208384291U (en) * | 2018-06-01 | 2019-01-15 | Oppo广东移动通信有限公司 | Electronic equipment |
| CN108983470A (en) * | 2018-07-31 | 2018-12-11 | Oppo广东移动通信有限公司 | Display screen component and electronic equipment |
| CN109521605B (en) * | 2018-12-24 | 2021-10-15 | 厦门天马微电子有限公司 | Backlight module and display device |
| CN109901327A (en) * | 2019-03-27 | 2019-06-18 | 武汉华星光电技术有限公司 | Backlight module and display device |
| CN110231735B (en) * | 2019-05-16 | 2023-08-22 | 武汉华星光电技术有限公司 | display device |
| CN110471211A (en) * | 2019-08-28 | 2019-11-19 | 武汉华星光电技术有限公司 | Liquid crystal display panel, liquid crystal display device and electronic equipment |
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