CN109033925B - OLED display screen body used for fingerprint identification and optical fingerprint identification device - Google Patents
OLED display screen body used for fingerprint identification and optical fingerprint identification device Download PDFInfo
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- CN109033925B CN109033925B CN201710429534.XA CN201710429534A CN109033925B CN 109033925 B CN109033925 B CN 109033925B CN 201710429534 A CN201710429534 A CN 201710429534A CN 109033925 B CN109033925 B CN 109033925B
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- G06—COMPUTING; CALCULATING OR COUNTING
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- 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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- 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
- G06V40/1341—Sensing with light passing through the finger
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Abstract
The invention provides an OLED display screen body used for fingerprint identification and an optical fingerprint identification device, wherein the optical fingerprint identification device comprises the OLED display screen body and an optical sensor, the optical sensor is arranged on one side far away from the light emitting surface of the OLED display screen body, a non-transparent material layer is arranged outside or inside the screen body on one side of the OLED display screen body far away from the light emitting direction of the OLED display screen body, a plurality of micropores are arranged on the non-transparent material layer, and the micropores are arranged corresponding to the non-display area. The OLED transparent screen body integrated with the fingerprint identification function adopts the non-transparent material layer with the micropore structure, so that the interference of light rays emitted by the OLED display screen body to a detector can be effectively reduced, the imaging is clearer, and the non-transparent material layer can be directly integrated with the touch function on the OLED display screen body, so that the electrical control and the thinning of the fingerprint identification device are realized.
Description
Technical Field
The invention relates to the technical field of optical fingerprint identification devices, in particular to an integrated touch type optical fingerprint identification device adopting an OLED display screen.
Background
An optical fingerprint collector is a fingerprint collector which needs a light source, and the light source of the optical fingerprint collector mainly adopts an LED light source and a light guide plate at present, so that the optical fingerprint collector has the defects of low energy efficiency, uneven illumination, high assembly requirement and higher cost.
Since Organic Light Emitting devices (abbreviated as OLEDs) have the advantages of fast response, no pollution, high contrast, planarization, and lightness, OLED is used to replace LED Light sources in optical fingerprint collectors, so as to overcome the disadvantages of LED Light sources and Light guide plates as Light sources in optical fingerprint collectors.
CN106156753A discloses an array substrate with fingerprint recognition function, a manufacturing method thereof, and a display device, the device includes an optical sensing driving unit integrated on an OLED backplane, the optical sensing driving unit is used for receiving light emitted by an OLED light-emitting unit and passing through the backplane to be reflected by finger valleys and ridges, and determining finger texture information according to light intensity of the light. The common OLED light source adopted by the scheme has the problems of higher signal-to-noise ratio and poor imaging quality when in use.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defects of large signal-to-noise ratio, poor imaging quality and short service life existing in the prior art when the OLED is used as the light source of the fingerprint identification device, thereby providing an integrated touch optical fingerprint identification device, which adopts an improved OLED transparent screen body, and can effectively reduce the interference of the light emitted by the OLED display screen body to a detector due to the adoption of the opaque material layer with the micropore structure, so that the imaging is clearer, and the opaque conductive layer can realize the electrical connection of the device and an external circuit, so as to realize the touch function of the OLED display screen body without increasing the thickness of the OLED display screen body.
In order to achieve the purpose, the invention adopts the following technical scheme:
an OLED display screen body used for fingerprint identification comprises a transparent substrate and an encapsulation cover plate, wherein a plurality of transparent anode layers arranged in an array mode are arranged on the transparent substrate, a plurality of pixel limiting layers and organic light emitting units formed between the adjacent pixel limiting layers are formed on the transparent anode layers, and transparent cathode layers are formed above the pixel limiting layers and the organic light emitting units;
an opaque material layer is arranged outside or inside the screen body on one side of the OLED display screen body, which is far away from the light emitting direction of the OLED display screen body, and a plurality of micropores are formed in the opaque material layer; a transparent insulating layer is arranged between the transparent substrate and the transparent cathode layer, the projection of the transparent insulating layer on the transparent substrate covers the projection of the micropore below the transparent insulating layer on the transparent substrate, and the cross section area of the transparent insulating layer is slightly larger than or equal to that of the micropore.
Preferably, the opaque material layer is disposed between the transparent substrate and the transparent anode layer, the transparent insulating layer is disposed between the opaque material layer and the organic light emitting unit, and the organic light emitting unit covers the transparent insulating layer and is partially disposed in contact with the transparent anode layer.
The opaque material layer is arranged on one side of the transparent substrate far away from the transparent anode layer; the transparent insulating layer is arranged between the transparent anode layer and the organic light-emitting unit, and the organic light-emitting unit covers the transparent insulating layer and is partially arranged in contact with the transparent anode layer.
The opaque material layer is arranged on one side of the packaging cover plate close to the transparent cathode layer; the transparent insulating layer is arranged between the transparent anode layer and the organic light-emitting unit, and the organic light-emitting unit covers the transparent insulating layer and is partially arranged in contact with the transparent anode layer.
The opaque material layer is arranged on one side of the packaging cover plate, which is far away from the transparent cathode layer; the transparent insulating layer is arranged between the transparent anode layer and the organic light-emitting unit, and the organic light-emitting unit covers the transparent insulating layer and is partially arranged in contact with the transparent anode layer.
An etching area is arranged between the adjacent transparent anode layers, and the micropores are arranged corresponding to the etching area and/or the transparent anode layers; and the projections of the etching area and the transparent anode layer on the transparent substrate respectively cover the projections of the correspondingly arranged micropores on the transparent substrate.
The etched area is filled with an insulating material.
The diameter of micropore is 1um-500um, it is adjacent interval between the micropore is 1um-10 mm.
The organic light emitting unit is a red light emitting unit, a blue light emitting unit, a green light emitting unit or a white light emitting unit.
The opaque material layer is an opaque conductive material layer; the OLED display screen body further comprises an automatic switch control unit, and the automatic control system can sense finger signals acting on the light emitting surface of the OLED display screen body and transmit the finger signals to the switch of the transparent conducting layer, so that the on-off of the power switch is controlled, and the display area is displayed or extinguished. The opaque conductive material layer is an Al metal layer, an Ag metal layer, a Cu metal layer, a Mo/Al/Mo alloy metal layer or a Cr/Al/Cr alloy metal layer.
An integrated touch type optical fingerprint identification device comprises an optical sensor and an OLED display screen body, wherein the optical sensor is arranged on one side of a light outlet surface of the OLED display screen body, when a finger touches and presses the light outlet surface of the OLED display screen body, light emitted by a display area is reflected by the finger, and partial light penetrates through a micropore and then reaches the optical sensor to form a fingerprint identification signal.
An integrated touch type optical fingerprint identification device is characterized by comprising an optical sensor and an OLED display screen body, wherein the optical sensor is arranged on one side far away from a light-emitting surface of the OLED display screen body;
after light rays emitted by the display area are reflected by fingers, partial light rays pass through the micropores and reach the optical sensor so as to form a fingerprint identification signal;
when the finger leaves the light-emitting surface of the OLED display screen body or exceeds a preset time length, the coupling capacitance between the opaque conductive material layer and the finger disappears, the finger signal disappears, and the signal change is transmitted to the switch controller of the transparent electrode layer through the sensor, so that the switch is closed to enable the display area to be in a display state.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the invention, a fingerprint identification function is integrated into an OLED display screen body, the display screen body is of a typical PMOLED structure, an opaque material layer is arranged outside or inside the screen body on one side of the OLED display screen body far away from the light-emitting direction of the OLED display screen body, and a plurality of micropores are arranged on the opaque material layer; transparent insulating layers are correspondingly arranged above the micropores, and the cross sectional area of the transparent insulating layers is slightly larger than or equal to that of the micropores. The invention can effectively prevent the light emitted by the display area from being captured by the optical sensor due to the arrangement of the non-transparent material layer with the micropore structure, and the insulating layer is arranged above the micropore area, so that the upper area is a non-display area, and the light emitted by the light emitting area passes through the OLED display screen body after meeting the finger and being reflected in the light emitting direction and is captured by the optical sensor after passing through the micropore, thereby effectively shielding the interference of the light in the light emitting area on the fingerprint reflected light and obtaining the fingerprint pattern with high definition.
2. The cross-sectional area of the transparent insulating layer for forming the non-display area is slightly larger than or equal to the cross-sectional area of the micropores, so that light rays in the light-emitting area can be effectively prevented from being captured by the optical sensor in various reflection diffuse reflection modes and the like, interference of the light rays in the light-emitting area on the reflected light rays of the fingerprint can be effectively shielded, and the fingerprint pattern with high definition can be obtained.
3. In order to ensure that light reflected by the fingerprint is captured by the optical sensor to the maximum extent after being reflected, the diameter of each micropore is 1-500 um, and the distance between every two adjacent micropores is 1-10 mm. By verification, the opaque material layer adopting the design can capture the fingerprint reflected light to the maximum extent by the optical sensor to form a high-quality fingerprint pattern.
4. The etching area between the adjacent transparent anode layers is filled with insulating materials, so that the problem of anode burrs formed in the etching process can be effectively solved, and the problem of electric leakage is avoided.
5. Compared with the traditional fingerprint identification, the invention integrates the fingerprint identification function on the OLED display screen, has simple structure, low power consumption, easy assembly and low cost, and is suitable for the display field of notebook computers and mobile phones.
6. When the opaque material layer is the opaque conductive material layer, a coupling capacitor is formed between the finger and the opaque conductive material layer applying current due to a human body electric field, and for high-frequency current, the capacitor is a direct conductor, so that the finger sucks a small current from a contact point to sense whether the finger touches the fingerprint identifier, and then the display area of the fingerprint identifier is started. When the fingerprint identification device comprises the switch automatic control unit, the automatic control system can sense the finger signal acting on the light-emitting surface of the OLED screen body and transmit the finger signal to the switch of the transparent conducting layer, so that the power switch is started to enable the display area to display. Specifically, the switch automatic control unit comprises a sensor and a transparent electrode layer switch controller, wherein the sensor is respectively connected with the opaque conductive material layer and the transparent electrode layer switch controller;
when a finger touches and presses the light-emitting surface of the OLED display screen body, the opaque conductive material layer (7) and the finger form a coupling capacitor, so that the opaque conductive material layer (7) senses a finger signal and transmits the signal to the switch controller of the transparent electrode layer through the sensor, and the switch is started to enable the display area to display. When the finger leaves the light-emitting surface of the OLED screen body or exceeds a preset time length, the coupling capacitance between the opaque conductive material layer and the finger disappears, the finger signal disappears, and the signal change is transmitted to the switch controller of the transparent electrode layer through the sensor, so that the switch is closed to enable the display screen to be in a non-display state. The OLED screen is simple in structure, after the current is applied to the opaque conductive layer, the touch feedback effect is achieved by utilizing the capacitance principle, the on or off of the display screen is controlled, and therefore the OLED screen can be started only when a finger signal is sensed, so that the service life of the OLED screen is greatly prolonged
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic top view of an OLED display panel according to the present invention;
FIG. 2 is a sectional view taken along line A-A' of example 1;
FIG. 3 is a sectional view taken along line B-B' in example 1;
FIG. 4 is a schematic structural diagram of an opaque material layer;
FIG. 5 is a schematic view of an integrated touch optical fingerprint recognition device
FIG. 6 is a schematic top view of another embodiment of an OLED display;
FIG. 7 is a sectional view taken along line B-B' in example 2;
FIG. 8 is a sectional view taken along line C-C' of example 2;
FIG. 9 is a schematic top view of another embodiment of an OLED display;
FIG. 10 is a sectional view taken along line A-A' in example 4;
FIG. 11 is a sectional view taken along line B-B' in example 4;
FIG. 12 is a sectional view taken along line A-A' in example 5;
FIG. 13 is a sectional view taken along line B-B' in example 5;
FIG. 14 is a sectional view taken along line A-A' in example 6;
FIG. 15 is a sectional view taken along line B-B' in example 6;
description of reference numerals: 1-transparent substrate, 2-transparent anode layer, 3-organic light emitting unit, 4-transparent cathode layer, 5-packaging cover plate, 6-insulating material, 7-opaque material layer, 8-display area, 9-non-display area, 10-micropore, 12-optical sensor, 13-pixel limiting layer and 14-transparent insulating layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being "formed on" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An OLED display screen body used for fingerprint identification comprises a transparent substrate 1 and an encapsulation cover plate 5, wherein a plurality of transparent anode layers 2 arranged in an array mode are arranged on the transparent substrate 1, a plurality of pixel limiting layers 13 and organic light emitting units 3 formed between the adjacent pixel limiting layers 13 are formed on the transparent anode layers 2, and transparent cathode layers 4 are formed above the pixel limiting layers 13 and the organic light emitting units 3;
an opaque material layer 7 is arranged outside or inside the OLED display screen body on one side of the OLED display screen body far away from the light emitting direction of the OLED display screen body, and a plurality of micropores 10 are formed in the opaque material layer 7; a transparent insulating layer 14 is arranged between the transparent substrate 1 and the transparent cathode layer 4, the projection of the transparent insulating layer 14 on the transparent substrate 1 covers the projection of the micropore 10 positioned below the transparent insulating layer on the transparent substrate 1, and the cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to that of the micropore 10.
As a first embodiment, the opaque material layer 7 is disposed between the transparent substrate 1 and the transparent anode layer 2, the transparent insulating layer 14 is disposed between the opaque material layer 7 and the organic light emitting unit 3, and the organic light emitting unit 3 covers the transparent insulating layer 14 and is partially disposed in contact with the transparent anode layer 2.
As a second embodiment, the opaque material layer 7 is disposed on a side of the transparent substrate 1 remote from the transparent anode layer 2; the transparent insulating layer 14 is disposed between the transparent anode layer 2 and the organic light emitting unit 3, and the organic light emitting unit 3 covers the transparent insulating layer 14 and is partially disposed in contact with the transparent anode layer 2.
As a third embodiment, the opaque material layer 7 is disposed on the side of the encapsulation cover plate 5 close to the transparent cathode layer 4; the transparent insulating layer 14 is disposed between the transparent anode layer 2 and the organic light emitting unit 3, and the organic light emitting unit 3 covers the transparent insulating layer 14 and is partially disposed in contact with the transparent anode layer 2.
As a fourth embodiment, the opaque material layer 7 is disposed on a side of the encapsulation cover plate 5 remote from the transparent cathode layer 4; the transparent insulating layer 14 is disposed between the transparent anode layer 2 and the organic light emitting unit 3, and the organic light emitting unit 3 covers the transparent insulating layer 14 and is partially disposed in contact with the transparent anode layer 2.
An etching area is arranged between the adjacent transparent anode layers 2, and the micropores 10 are arranged corresponding to the etching area and/or the transparent anode layers 2; the projections of the etched area and the transparent anode layer 2 on the transparent substrate 1 respectively cover the projections of the correspondingly arranged micro-holes 10 on the transparent substrate 1. By correspondingly disposed herein is meant that the pores 10 are disposed directly below the etched areas, or directly below the transparent anode layer 2, or both the etched areas and the transparent anode layer 2.
As shown in fig. 3, to cover the problem of burrs on the anode formed during etching, the etched area is filled with an insulating material 6, which covers part of the anode layer.
The diameter of micropore 10 is 1um-500um, it is adjacent interval between the micropore is 1um-10 mm.
The organic light emitting unit is a red light emitting unit, a blue light emitting unit, a green light emitting unit or a white light emitting unit.
The material of the opaque material layer 7 has no special requirement, so long as it is opaque and can achieve the purpose of the invention. Preferably, the opaque material layer is an opaque conductive material layer, and may be a metal layer such as a metal of Al Ag Cu or various alloys such as Mo/Al/Mo, Cr/Al/Cr, or the like. The opaque conductive material layer 7 is an Al metal layer, an Ag metal layer, a Cu metal layer, a Mo/Al/Mo alloy metal layer or a Cr/Al/Cr alloy metal layer.
Particularly, when the opaque material layer is the opaque conductive material layer in this embodiment, the OLED display screen body may further include an automatic switch control unit, and the automatic control system may sense a finger signal acting on the light emitting surface of the OLED display screen body and transmit the finger signal to the switch of the transparent conductive layer, so as to control on/off of the power switch, and display or off of the display area.
The switch automatic control unit comprises a sensor and a transparent electrode layer switch controller, and the sensor is respectively connected with the opaque conductive material layer and the transparent electrode layer switch controller;
when a finger touches and presses the light-emitting surface of the OLED display screen body, the opaque conductive material layer and the finger form a coupling capacitor, so that the opaque conductive material layer senses a finger signal and transmits the signal to the switch controller of the transparent electrode layer through the sensor, and the switch is started to enable the display area to emit light;
when the finger leaves the light-emitting surface of the OLED screen body or exceeds a preset time length, the coupling capacitance between the opaque conductive material layer and the finger disappears, the finger signal disappears, and the signal change is transmitted to the switch controller of the transparent electrode layer through the sensor, so that the switch is closed to enable the light-emitting area to be in a non-light-emitting state.
An integrated touch type optical fingerprint identification device comprises an optical sensor 12 and an OLED display screen body, wherein the optical sensor 12 is arranged on one side far away from a light-emitting surface of the OLED display screen body, when a finger touches and presses the light-emitting surface of the OLED display screen body, light emitted by a display area is reflected by the finger, and partial light penetrates through a micropore 10 and then reaches the optical sensor 12 to form a fingerprint identification signal.
When the opaque material layer in the OLED display screen body is an opaque conductive material layer, the optical sensor 12 is arranged on one side far away from the light-emitting surface of the OLED display screen body, and when a finger touches and presses the light-emitting surface of the OLED display screen body, the opaque conductive material layer and the finger form a coupling capacitor, so that the opaque conductive material layer senses a finger signal and transmits the signal to a transparent electrode layer switch controller through a sensor, and a switch is started to enable the display area to emit light;
after the light emitted by the display area is reflected by a finger, part of the light passes through the micropores 10 and reaches the optical sensor 12 so as to form a fingerprint identification signal;
when the finger leaves the light-emitting surface of the OLED screen body or exceeds a preset time length, the coupling capacitance between the opaque conductive material layer and the finger disappears, the finger signal disappears, and the signal change is transmitted to the switch controller of the transparent electrode layer through the sensor, so that the switch is closed to enable the display area to be in a non-display state.
The light source of the optical fingerprint identification device of the present invention adopts an OLED display screen body, which has the following embodiments, and corresponding to fig. 3 to 15 of the accompanying drawings, when the opaque material layer is an opaque conductive material layer, the OLED display screen body may include an automatic controller and a sensor, which are not shown in the drawings:
example 1
As shown in fig. 5, the optical fingerprint identification device in this embodiment includes an OLED display panel body and an optical sensor 12, where the optical sensor 12 is disposed on a side away from a light emitting surface of the OLED display panel body, and the OLED display panel body is shown in fig. 1 to 4, and includes:
the transparent substrate 1 and the encapsulation cover plate 5 are sealed by a first sealing medium 15 to form a closed structure.
The transparent substrate 1 is provided with an opaque material layer 7, as shown in fig. 4, the opaque material layer 7 is provided with a plurality of micropores 10, and the material of the opaque material layer 7 has no special requirement, so long as the opaque material layer is opaque and can achieve the purpose of the invention. Preferably, the opaque material layer is an opaque conductive material layer, and may be a metal layer such as a metal of Al Ag Cu or various alloys such as Mo/Al/Mo, Cr/Al/Cr, or the like.
The plurality of transparent anode layers 2 arranged in an array are formed on the opaque material layer 7, the array arrangement can be that the plurality of transparent anode layers 2 are arranged in parallel, for example, the plurality of transparent anode layers 2 are arranged in parallel longitudinally and transversely, a non-parallel structure can also be adopted, as long as the adjacent transparent anode layers are insulated, the invention purpose is met, when in preparation, a transparent electrode layer is formed on the opaque material layer 7, the plurality of transparent anode layers 2 are formed by etching, and the width of an etching area between the transparent anode layers 2 is 1um-1000 um. In order to cover the problem of burrs on the anode formed during etching, the etched area is filled with an insulating material 6, and the micro-holes 10 are arranged below the etched area.
The transparent anode layer 2 is formed with a plurality of pixel defining layers 13 and organic light emitting cells 3 formed between adjacent pixel defining layers 13, and a transparent cathode layer 4 is formed over the pixel defining layers 13 and the organic light emitting cells 3. Under the condition of power supply, no current passes through the organic light emitting unit 3 positioned above the etching area, and the organic light emitting unit cannot emit light, so that a non-display area 9 is formed, and current passes through the organic light emitting unit 3 positioned above the transparent anode layer 2, so that light can be emitted and displayed, so that a display area 8 is formed. The organic light emitting unit is a red light emitting unit, a blue light emitting unit, a green light emitting unit or a white light emitting unit.
An insulating material layer 6 is provided beneath the pixel defining layer 13, i.e. an insulating material layer 6 is provided between the pixel defining layer 13 and the opaque material layer 7, while an insulating material layer 6 is provided between the pixel defining layer 13 and the transparent anode layer 2.
Because the opaque material layer 7 is made of metal, a transparent insulating layer 14 is further formed above the etching area between the transparent anode layers 2, the projection of the transparent insulating layer 14 on the transparent substrate 1 covers the projection of the micropore 10 on the transparent substrate 1, and the cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to the cross-sectional area of the micropore 10. The transparent insulating layer 14 can cover the opaque material layer 7 to prevent the opaque material layer from generating a point discharge phenomenon, and the light path can be changed due to refraction of the transparent insulating layer, so that the small hole imaging is clearer.
The organic light emitting unit 3 covers the transparent insulating layers 14 and fills gaps between adjacent transparent insulating layers 14, the projection of the transparent insulating layers 14 on the transparent substrate 1 covers the projection of the micropores 10 on the transparent substrate 1, and the cross-sectional area of the transparent insulating layers 14 is equal to that of the micropores 10.
The transparent anode layer 2 and the transparent cathode layer 4 are electrically connected with a power supply, when a finger touches and presses the light-emitting surface of the OLED display screen body, light rays in a display area penetrate through the transparent cathode and the packaging layer, irradiate the finger fingerprint, then are reflected and pass through the packaging cover plate 5, the transparent cathode layer 4, the organic light-emitting unit 3, the transparent insulating layer 14(PI layer) and the non-transparent material layer 7, and partial light rays penetrate through the micropores 10 and then reach the optical sensor 12 to form a fingerprint identification signal. The opaque conductive material of the present invention functions as follows: firstly, forming a small hole through an opaque layer, and imaging by using a small hole imaging mode; and the second is as a touch sensing layer to realize touch control of the screen body.
The shape of the micropores 10 of the opaque material layer 7 is not particularly required, and may be one or more of a circle, a hexagon, a square, a triangle, a rhombus and a pentagon.
The wavelength of the light emitted by the OLED display screen body is 380-760nm, preferably 500-570 nm.
The diameter of micropore 10 is 1um-500um, it is adjacent interval between the micropore is 1um-10 mm. Here, the diameter of the micropores has the following meaning: if the micropores are circular, the diameter is the diameter of the circle in the general sense; when the shape of the micropore is other shapes, the diameter is the diameter of the circumscribed circle, and when the shape is irregular, the diameter is the direct distance between two points with the widest width of the graph. The distance between two adjacent micropores refers to the distance between the nearest two points of the two adjacent micropores.
The preparation method of the OLED display panel of this embodiment is as follows:
s1, forming an opaque material layer 7 on a transparent substrate, and then carrying out photoetching to form small holes, wherein the diameter of each small hole is 1-500 um, and the distance between every two small holes is 1-10 mm;
s2, preparing (sputtering) a conductive material layer on the opaque material layer 7, preparing a transparent electrode layer, etching the transparent electrode layer according to the design drawing to form a plurality of strip-shaped transparent anode layers 2, arranging adjacent transparent anode layers 2 in parallel, forming an etching area between the two, coating an insulating material 6, and forming the insulating layer 6 by using a photolithography process.
S3, forming a transparent insulating material layer above the etching area in a spin coating mode, then forming a transparent insulating layer 14 through photoetching, wherein the projection of the transparent insulating layer 14 and the projection of the micropore 10 on the transparent substrate 1 cover the projection of the micropore 10 on the transparent substrate 1, and the cross-sectional area of the transparent insulating layer 14 is slightly larger than that of the micropore 10. If the diameter of the micro-hole 10 is 15um, the diameter of the transparent insulating layer 14 is 30 um;
s4 forming a pixel limiting layer 13, spin-coating a pixel limiting layer material on the etched substrate, and then forming the pixel limiting layer by utilizing a photoetching process;
and S5, sequentially forming the organic light-emitting unit 3 and the transparent cathode layer 4 by evaporation on the basis of the step S4, and packaging to obtain the cathode material.
Particularly, when the opaque material layer is the opaque conductive material layer in this embodiment, the OLED display screen body may further include an automatic switch control unit, and the automatic control system may sense a finger signal acting on the light emitting surface of the OLED display screen body and transmit the finger signal to the switch of the transparent conductive layer, so as to control on/off of the power switch, and enable the light emitting region to emit light or to be extinguished.
As shown in fig. 2, the switching automatic control unit includes a sensor and a transparent electrode layer switching controller, the sensor being connected to the opaque conductive material layer and the transparent electrode layer switching controller, respectively;
when a finger touches and presses the light-emitting surface of the OLED screen body, the opaque conductive material layer and the finger form a coupling capacitor, so that the opaque conductive material layer senses a finger signal and transmits the signal to the switch controller of the transparent electrode layer through the sensor, and the switch is started to enable the light-emitting area to emit light;
when the finger leaves the light-emitting surface of the OLED screen body or exceeds a preset time length, the coupling capacitance between the opaque conductive material layer and the finger disappears, the finger signal disappears, and the signal change is transmitted to the switch controller of the transparent electrode layer through the sensor, so that the switch is closed to enable the light-emitting area to be in a non-light-emitting state.
Example 2
The structure of the optical fingerprint identification device of the embodiment is the same as that of the embodiment 1 except for special description; wherein the micropores 10 are disposed below the transparent anode layer 2, and the specific structure is shown in fig. 6-8:
and a transparent insulating layer 14 is formed after etching the transparent anode layer 2 corresponding to the upper part of the micropore 10, the projection of the transparent insulating layer 14 on the transparent substrate 1 covers the projection of the micropore 10 on the transparent substrate 1, and the cross section area of the transparent insulating layer 14 is slightly larger than or equal to that of the micropore 10.
The etched areas between adjacent transparent anode layers 2 are free of pores 10 and do not need to be provided with a transparent insulating layer 14.
Example 3
The structure of the optical fingerprint identification device of the embodiment is the same as that of the embodiment 1 except for special description; wherein the opaque insulating layer 7 is disposed between the transparent substrate 1 and the transparent anode layer 2, the transparent anode layer 2 and the etching region are both provided with micro-holes 10 thereunder, and the top view of the device is shown in fig. 9.
A transparent insulating layer 14 is formed in an etching area corresponding to the upper part of the micropore 10, a transparent insulating layer 14 is formed after etching of the transparent anode layer 2 corresponding to the upper part of the micropore 10, the projection of the transparent insulating layer 14 on the transparent substrate 1 covers the projection of the micropore 10 on the transparent substrate 1, and the cross section area of the transparent insulating layer 14 is slightly larger than or equal to that of the micropore 10. That is, the structure of the etched region in this embodiment is the same as that in embodiment 1, and the region corresponding to the transparent anode layer 2 is the same as that in embodiment 2.
Example 4
The structure of the optical fingerprint identification device of the embodiment is the same as that of the embodiment 1 except for special description; wherein an opaque insulating layer 7 is arranged on the side of the transparent substrate 1 remote from the transparent anode layers 2, wherein micro-holes 10 are arranged below etched areas between adjacent transparent anode layers 2, as seen in top view in fig. 1.
As shown in fig. 10-11, a transparent insulating layer 14 is formed in the etched region corresponding to the upper portion of the micro-hole 10, the projection of the transparent insulating layer 14 on the transparent substrate 1 covers the projection of the micro-hole 10 on the transparent substrate 1, and the cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to the cross-sectional area of the micro-hole 10.
As an alternative embodiment, the micro via 10 of the present embodiment is disposed below the transparent anode layer 2, and a top view thereof is shown in fig. 6, the transparent anode layer 2 corresponding to the upper side of the micro via 10 is etched to form a transparent insulating layer 14, a projection of the transparent insulating layer 14 on the transparent substrate 1 covers a projection of the micro via 10 on the transparent substrate 1, and a cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to a cross-sectional area of the micro via 10.
As another alternative, the transparent anode layer 2 and the etched region of this embodiment are each provided with pores 10 underneath, as shown in fig. 9 in a top view. A transparent insulating layer 14 is formed in an etching area corresponding to the upper part of the micropore 10, a transparent insulating layer 14 is formed after etching of the transparent anode layer 2 corresponding to the upper part of the micropore 10, the projection of the transparent insulating layer 14 on the transparent substrate 1 covers the projection of the micropore 10 on the transparent substrate 1, and the cross section area of the transparent insulating layer 14 is slightly larger than or equal to that of the micropore 10.
Example 5
The structure of the optical fingerprint identification device of the embodiment is the same as that of the embodiment 1 except for special description; wherein the opaque layer 7 is arranged on the side of the encapsulation cover plate 5 far away from the transparent cathode layer 4; wherein the micro-holes 10 are arranged above the etched areas between adjacent transparent anode layers 2, as shown in figure 1 in a top view.
As shown in fig. 12-13, the transparent anode layer 2 corresponding to the lower portion of the micro-hole 10 is etched to form a transparent insulating layer 14, a projection of the transparent insulating layer 14 on the transparent substrate 1 covers a projection of the micro-hole 10 on the transparent substrate 1, and a cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to a cross-sectional area of the micro-hole 10.
As an alternative embodiment, the micro-holes 10 of this embodiment are disposed above the transparent anode layer 2, and a top view thereof is as shown in fig. 6, the transparent anode layer 2 corresponding to the micro-holes 10 is etched to form a transparent insulating layer 14, a projection of the transparent insulating layer 14 on the transparent substrate 1 covers a projection of the micro-holes 10 on the transparent substrate 1, and a cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to a cross-sectional area of the micro-holes 10.
As another alternative, the micropores 10 of the present embodiment may also be simultaneously disposed above the etched region between the transparent anode layer 2 and the adjacent transparent anode layer 2, and the top view thereof is shown in fig. 9. A transparent insulating layer 14 is formed in an etching area corresponding to the lower part of the micropore 10, a transparent insulating layer 14 is formed after etching of the transparent anode layer 2 corresponding to the lower part of the micropore 10, the projection of the transparent insulating layer 14 on the transparent substrate 1 covers the projection of the micropore 10 on the transparent substrate 1, and the cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to that of the micropore 10.
Example 6
The structure of the optical fingerprint identification device of the embodiment is the same as that of the embodiment 1 except for special description; wherein the opaque insulating layer 7 is arranged between the encapsulation cover plate 5 and the transparent cathode layer 4; wherein the micro-holes 10 are arranged above the etched areas between adjacent transparent anode layers 2, as shown in figure 1 in a top view.
As shown in fig. 14-15, a transparent insulating layer 14 is formed after etching the transparent anode layer 2 corresponding to the micro-hole 10, a projection of the transparent insulating layer 14 on the transparent substrate 1 covers a projection of the micro-hole 10 on the transparent substrate 1, and a cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to a cross-sectional area of the micro-hole 10.
As an alternative embodiment, the micro-holes 10 of this embodiment are disposed above the transparent anode layer 2, and a top view thereof is as shown in fig. 6, the transparent anode layer 2 corresponding to the micro-holes 10 is etched to form a transparent insulating layer 14, a projection of the transparent insulating layer 14 on the transparent substrate 1 covers a projection of the micro-holes 10 on the transparent substrate 1, and a cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to a cross-sectional area of the micro-holes 10.
As another alternative, the micropores 10 of the present embodiment may also be simultaneously disposed above the etched region between the transparent anode layer 2 and the adjacent transparent anode layer 2, and the top view thereof is shown in fig. 9. A transparent insulating layer 14 is formed in an etching area corresponding to the lower part of the micropore 10, a transparent insulating layer 14 is formed after etching of the transparent anode layer 2 corresponding to the lower part of the micropore 10, the projection of the transparent insulating layer 14 on the transparent substrate 1 covers the projection of the micropore 10 on the transparent substrate 1, and the cross-sectional area of the transparent insulating layer 14 is slightly larger than or equal to that of the micropore 10.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. An OLED display screen body used for fingerprint identification comprises a transparent substrate (1) and an encapsulation cover plate (5), wherein a plurality of transparent anode layers (2) which are arranged in an array mode are arranged on the transparent substrate (1), a plurality of pixel limiting layers (13) and organic light emitting units (3) formed between every two adjacent pixel limiting layers (13) are formed on the transparent anode layers (2), and transparent cathode layers (4) are formed above the pixel limiting layers (13) and the organic light emitting units (3); it is characterized in that the preparation method is characterized in that,
an opaque material layer (7) is arranged outside or inside the screen body on one side of the OLED display screen body, which is far away from the light emitting direction of the OLED display screen body, and a plurality of micropores (10) are formed in the opaque material layer (7);
a transparent insulating layer (14) is arranged between the transparent substrate (1) and the transparent cathode layer (4), the projection of the transparent insulating layer (14) on the transparent substrate (1) covers the projection of the micropores (10) which are correspondingly arranged on the transparent substrate (1), and the cross section area of the transparent insulating layer (14) is slightly larger than or equal to that of the micropores (10);
an etching area is arranged between the adjacent transparent anode layers (2), and the micropores (10) are arranged corresponding to the etching area and/or the transparent anode layers (2); the projections of the etching area and the transparent anode layer (2) on the transparent substrate (1) respectively cover the projections of the correspondingly arranged micropores (10) on the transparent substrate (1).
2. The OLED display screen body for fingerprint identification according to claim 1,
the opaque material layer (7) is arranged between the transparent substrate (1) and the transparent anode layer (2), the transparent insulating layer (14) is arranged between the opaque material layer (7) and the organic light-emitting unit (3), and the organic light-emitting unit (3) covers the transparent insulating layer (14) and is partially arranged in contact with the transparent anode layer (2).
3. The OLED display screen body for fingerprint recognition according to claim 1, wherein the opaque material layer (7) is disposed on a side of the transparent substrate (1) remote from the transparent anode layer (2);
the transparent insulating layer (14) is arranged between the transparent anode layer (2) and the organic light-emitting unit (3), and the organic light-emitting unit (3) covers the transparent insulating layer (14) and is partially arranged in contact with the transparent anode layer (2).
4. The OLED display screen body for fingerprint recognition according to claim 1, wherein the opaque material layer (7) is disposed on a side of the encapsulation cover plate (5) close to the transparent cathode layer (4) or on a side of the encapsulation cover plate (5) far from the transparent cathode layer (4);
the transparent insulating layer (14) is arranged between the transparent anode layer (2) and the organic light-emitting unit (3), and the organic light-emitting unit (3) covers the transparent insulating layer (14) and is partially arranged in contact with the transparent anode layer (2).
5. OLED display screen body for fingerprint identification according to claim 4, characterized in that the etched area is filled with an insulating material (6).
6. The OLED display screen body for fingerprint identification according to claim 1, wherein the diameter of the micro-holes (10) is 1um-500um, and the distance between the adjacent micro-holes is 1um-10 mm.
7. The OLED display screen body for fingerprint identification according to any one of claims 1 to 6, wherein the opaque material layer is an opaque conductive material layer; the OLED display screen body further comprises an automatic switch control unit, and the automatic control system can sense finger signals acting on the light emitting surface of the OLED display screen body and transmit the finger signals to the switch of the transparent conducting layer, so that the on-off of the power switch is controlled, and the display area is enabled to display or extinguish.
8. An integrated touch type optical fingerprint identification device, which comprises an optical sensor (12) and the OLED display screen body as claimed in any one of claims 1 to 6, wherein the optical sensor (12) is disposed at a side away from the light-emitting surface of the OLED display screen body, when a finger touches and presses on the light-emitting surface of the OLED display screen body, light emitted from a display area is reflected by the finger, and part of the light passes through the micropores (10) and reaches the optical sensor (12) to form a fingerprint identification signal.
9. An integrated touch type optical fingerprint identification device, which comprises an optical sensor (12) and the OLED display screen body of claim 7, wherein the optical sensor (12) is arranged at a side far away from the light-emitting surface of the OLED display screen body, when a finger touches and presses the light-emitting surface of the OLED display screen body, the opaque conductive material layer and the finger form a coupling capacitor, so that the opaque conductive material layer senses a finger signal and transmits the signal to the switch controller of the transparent electrode layer through the sensor, and the switch is started to enable the display area to display;
after light rays emitted by the display area are reflected by fingers, partial light rays pass through the micropores (10) and reach the optical sensor (12) so as to form a fingerprint identification signal;
when the finger leaves the light-emitting surface of the OLED screen body or exceeds a preset time length, the coupling capacitance between the opaque conductive material layer and the finger disappears, the finger signal disappears, and the signal change is transmitted to the switch controller of the transparent electrode layer through the sensor, so that the switch is closed to enable the display area to be in a non-display state.
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| CN201710429534.XA CN109033925B (en) | 2017-06-08 | 2017-06-08 | OLED display screen body used for fingerprint identification and optical fingerprint identification device |
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| US10181070B2 (en) * | 2015-02-02 | 2019-01-15 | Synaptics Incorporated | Low profile illumination in an optical fingerprint sensor |
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| CN108491749A (en) * | 2016-12-30 | 2018-09-04 | 固安翌光科技有限公司 | OLED screen body and optical fingerprint identification device as fingerprint identification device light source |
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