WO2019205646A1 - 指纹识别装置、显示面板及其制作方法、显示装置 - Google Patents
指纹识别装置、显示面板及其制作方法、显示装置 Download PDFInfo
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- WO2019205646A1 WO2019205646A1 PCT/CN2018/119609 CN2018119609W WO2019205646A1 WO 2019205646 A1 WO2019205646 A1 WO 2019205646A1 CN 2018119609 W CN2018119609 W CN 2018119609W WO 2019205646 A1 WO2019205646 A1 WO 2019205646A1
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- shielding structure
- aperture
- display panel
- fingerprint
- display
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
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- H—ELECTRICITY
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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Definitions
- At least one embodiment of the present disclosure relates to a fingerprint recognition device, a display panel, a method of fabricating the same, and a display device.
- At least one embodiment of the present disclosure provides a fingerprint recognition apparatus including a fingerprint sensor, a hole-shaped aperture, and a first shielding structure.
- the fingerprint sensor includes a plurality of sensing units; the aperture stop is disposed on the light incident side of the fingerprint sensor and includes a hole through which the light is allowed to be incident on the at least one sensing unit of the fingerprint sensor; the first shielding A structure is disposed on a side of the apertured aperture that faces away from the fingerprint sensor and at least partially surrounds the aperture.
- the first shielding structure is light transmissive and includes a first opening exposing the hole; a first side of the first shielding structure adjacent to the hole
- the angle between the outer surface and the plane in which the apertured aperture is located is an obtuse angle.
- the first shielding structure is opaque and includes a first opening exposing the hole.
- the first shielding structure is transparent and covers the hole.
- the fingerprint recognition apparatus further includes: a second shielding structure covering at least a second side of the first shielding structure away from the hole and including a second opening corresponding to the hole.
- the second shielding structure is light transmissive; a cut surface of the second side or the second side of the first shielding structure and the aperture stop The angle between the planes is an obtuse angle; the refractive index of the second shielding structure is greater than the refractive index of the first shielding structure.
- the second side surface of the second shielding structure is a curved surface facing the concave near the second shielding structure, and the tangent of the curved surface and the aperture stop
- the angle between the planes is an obtuse angle.
- the apertured aperture includes an opaque material.
- the first shielding structure is configured to reduce or block ambient light incident to the at least one sensing unit via the hole.
- At least one embodiment of the present disclosure further provides a display panel, which includes any of the fingerprint recognition devices provided by the embodiments of the present disclosure.
- a display panel further includes: a display pixel array including a plurality of pixel units arranged in an array; wherein the first shielding structure and the holes are disposed in the plurality of pixel units The gap between them.
- the first shielding structure is further configured as a pixel defining layer of each of the pixel units of the display pixel array.
- the first shielding structure is further configured as a spacer for supporting the display array.
- the fingerprint identification device further includes a second shielding structure configured as a spacer for supporting the display pixel array.
- the display pixel array includes a conductive layer at least in the pixel unit, and the apertured aperture is located in the same layer as the conductive layer.
- a display panel further includes a base substrate, the apertured aperture is located on the base substrate, and the fingerprint sensor is located in the apertured aperture and the substrate between.
- At least one embodiment of the present disclosure further provides a display device including any display panel provided by an embodiment of the present disclosure.
- At least one embodiment of the present disclosure further provides a method for fabricating a display panel, the method for fabricating a display panel, comprising: providing a fingerprint sensor, the fingerprint sensor comprising a plurality of sensing units; forming the hole on a light incident side of the fingerprint sensor
- the apertured aperture includes a hole; a first shielding structure is formed on a side of the apertured aperture that faces away from the fingerprint sensor, wherein the first shielding structure surrounds at least a portion of the aperture.
- a method for fabricating a display panel according to an embodiment of the present disclosure may further include: forming a second shielding structure on the first shielding structure and the aperture stop, wherein the second shielding structure covers at least the first A second side of the shielding structure remote from the aperture and including a second opening corresponding to the aperture.
- FIG. 1 is a schematic plan view of a fingerprint identification device according to an embodiment of the present disclosure
- Figure 2A is a schematic cross-sectional view taken along line A-A' of Figure 1;
- FIG. 2B is a partial cross-sectional view of another fingerprint identification device according to an embodiment of the present disclosure.
- FIG. 2C is a partial cross-sectional view of still another fingerprint identification device according to an embodiment of the present disclosure.
- 2D is a partial cross-sectional view of still another fingerprint identification device according to an embodiment of the present disclosure.
- FIG. 2E is a partial cross-sectional view of still another fingerprint identification device according to an embodiment of the present disclosure.
- 2F is a block diagram of a driving principle of an image sensor according to an embodiment of the present disclosure.
- 3A is a schematic plan view of a display panel according to an embodiment of the present disclosure.
- FIG. 3B is a schematic plan view showing an area in which a sensing unit is disposed in a display panel according to an embodiment of the present disclosure
- 3C is a schematic plan view showing another area of a display panel in which a sensing unit is disposed according to an embodiment of the present disclosure
- FIG. 3D is a schematic plan view showing another area in which a sensing unit is disposed in a display panel according to an embodiment of the present disclosure
- Figure 4A is a schematic cross-sectional view taken along line B-B' of Figure 3B;
- FIG. 4B is a partial cross-sectional view of a display panel according to an embodiment of the present disclosure.
- 4C is a partial cross-sectional view showing another display panel according to an embodiment of the present disclosure.
- 4D is a partial cross-sectional view showing still another display panel according to an embodiment of the present disclosure.
- 4E is a partial cross-sectional view showing still another display panel according to an embodiment of the present disclosure.
- FIG. 5 is a schematic diagram of an optical path when the display panel shown in FIG. 4B performs fingerprint recognition
- FIG. 6 is a schematic diagram of a display device according to an embodiment of the present disclosure.
- FIGS. 7A-7I are schematic diagrams of a method for fabricating a display panel according to an embodiment of the present disclosure.
- FIGS. 8A-8C are schematic diagrams showing another method of fabricating a display panel according to an embodiment of the present disclosure.
- FIGS. 9A-9C are schematic diagrams showing still another method of fabricating a display panel according to an embodiment of the present disclosure.
- At least one embodiment of the present disclosure provides a fingerprint recognition apparatus including a fingerprint sensor, a hole-shaped aperture, and a first shielding structure.
- the fingerprint sensor includes a plurality of sensing units; the apertured aperture is disposed on the light incident side of the fingerprint sensor and includes a hole through which the light is allowed to be incident on the sensing unit of the fingerprint sensor; the first shielding structure is disposed And a side of the apertured aperture facing away from the fingerprint sensor and at least partially surrounding the aperture.
- FIG. 1 is a schematic plan view of a fingerprint identification device according to an embodiment of the present disclosure
- FIG. 2A is a cross-sectional view taken along line A-A' of FIG. 1.
- the fingerprint recognition apparatus 10 includes a fingerprint sensor 3, a apertured aperture 2, and a first shielding structure 4.
- the fingerprint sensor 3 includes at least one sensing unit 301.
- a plurality of sensing units 301 are arranged in an array.
- the aperture stop 2 is disposed on the light incident side of the fingerprint sensor 3 and includes a hole 5 through which light is allowed to be incident on at least one sensing unit 301 of the fingerprint sensor 3, so that the sensor 3 can perform fingerprint recognition.
- the fingerprint sensor 3 includes a plurality of apertures 5 arranged in an array, each aperture 5 corresponding to each sensing unit 301, ie, an orthographic projection of each aperture 5 on the base substrate 1.
- each sensing unit 301 on the base substrate 1 coincides to enable light to be incident through the aperture 5 to the sensing unit 301 and received by the sensing unit 301.
- the fingerprint sensor 3 is a light sensor capable of sensing light and converting the optical signal into an electrical signal.
- the sensing unit 301 processes the received optical signal to convert the optical signal into an electrical signal output.
- ambient light typically also enters the sensing unit 301 through the aperture 5, thereby interfering with the optical signal used for fingerprint recognition (light reflected by the finger).
- Ambient light that interferes with fingerprint recognition is hereinafter referred to as disturbing light.
- the first shielding structure 4 is disposed on a side of the aperture-shaped aperture 2 facing away from the fingerprint sensor 3, and the first shielding structure 4 is at least partially Around the hole 5.
- the first shielding structure 4 can block at least part of the ambient light around the hole 5 from entering the hole 5, thereby reducing the interference light incident on the sensing unit 301 via the hole 5, improving the accuracy of the sensor for fingerprint recognition, and enabling the user to obtain more Good fingerprint recognition experience.
- FIG. 1 and FIG. 2A the first shielding structure 4 is disposed on a side of the aperture-shaped aperture 2 facing away from the fingerprint sensor 3, and the first shielding structure 4 is at least partially Around the hole 5.
- the first shielding structure 4 can block at least part of the ambient light around the hole 5 from entering the hole 5, thereby reducing the interference light incident on the sensing unit 301 via the hole 5, improving the accuracy of the sensor for fingerprint recognition, and enabling the user to obtain more Good fingerprint recognition experience.
- the apertured aperture 2 is disposed on the base substrate 1
- the fingerprint sensor 3 is disposed on a side of the base substrate 1 facing away from the apertured aperture 2
- the first shielding structure 4 is disposed in the apertured shape.
- the fingerprint sensor 3 may also be located between the base substrate 1 and the aperture stop 2, and other structures are the same as those shown in FIG. 2A.
- the first shielding structure 4 surrounds the entire hole 5 , and in other embodiments of the present disclosure, the first shielding structure 4 may also partially surround the hole 5 , ie, the first shielding.
- the structure 4 surrounds a portion of the outer contour of the aperture 5 to at least partially reduce the interfering light incident into the sensing unit 301 via the aperture 5.
- the first shield structure 4 can be opaque and includes a first opening 701 that exposes the aperture 5.
- the material of the first shield structure may be an organic material that does not transmit light, such as a black resin, such as a resin material to which black shading particles are added, or the like.
- the first shielding structure 4 may also be light transmissive, and the light transmissive first shielding structure 4 also has a certain degree of blocking effect on the interference light, thereby reducing incidence through the aperture 5 .
- the material of the first shielding structure may be an inorganic material or an organic material such as silicon nitride, silicon oxide, silicon oxynitride, a light transmissive resin material, or the like. It should be noted that the material of the first shielding structure is not limited to the above-listed types.
- the first shield structure 4 may be in the shape of a doughnut (the columnar profile perpendicular to the base substrate 1 is columnar) to block the disturbing light around the hole 5.
- the surface of the first shielding structure 4 remote from the aperture-shaped aperture 2 is a curved surface 403 that protrudes away from the aperture-shaped aperture 2, and the curved surface 403 can better block the interference light in all directions.
- the surface of the first shielding structure 4 away from the aperture-shaped aperture 2 is also a flat surface, which is not limited by the embodiment of the present disclosure.
- the first shielding structure 4 is transparent and includes a first opening 701 exposing the hole 5, and the first shielding structure 4 is close to The outer angle ⁇ between the first side 401 of the hole 5 and the plane of the aperture stop 2 is an obtuse angle.
- the first shielding structure 4 forms a total reflection structure with the air to reduce the interference light entering the hole, and has a simple structure and is easy to manufacture. As shown in FIG.
- FIG. 2C is a partial cross-sectional view of still another fingerprint recognition device according to an embodiment of the present disclosure.
- the first shielding structure 4 is light transmissive and covers the aperture 5, ie a portion of the first shielding structure 4 is located in the aperture 5.
- the fingerprint recognition device shown in FIG. 2C has a simple structure and is easy to manufacture. When the fingerprint recognition is performed, the light reflected by the finger is transmitted through the first shielding structure 4 to enter the hole 5, and then incident on the sensing unit 301 to realize fingerprint recognition. In this case, the portion of the first shield structure 4 surrounding the hole 5 can reduce the interference light incident on the sensing unit through the hole 5 by the occlusion function, thereby improving the accuracy of the fingerprint recognition device.
- the fingerprint identification device 10 further includes a second shielding structure 6 covering at least the second side 402 of the first shielding structure 4 away from the aperture 5 and including the corresponding to the aperture 5 Two openings 702.
- the first shielding structure 4 is light transmissive. When fingerprinting is performed, the light reflected by the finger enters the first shielding structure 4 to enter the hole 5, and then passes through the hole 5 and then enters the sensing unit 301 to implement the fingerprint. Identification. Since the second shielding structure 6 has the second opening 702 corresponding to the hole 5, it is possible to prevent the light reflected by the finger from passing through the second shielding structure 6 before entering the first shielding structure 4 to improve the utilization efficiency of light.
- the second shielding structure 6 is opaque, and is not transparent on the basis of the blocking effect of the portion of the first shielding structure 4 surrounding the hole 5 on the interference light.
- the second shielding structure 6 of the light has a further blocking effect on the interference light, and the interference light incident on the sensing unit 301 via the aperture 5 can be reduced, thereby improving the accuracy of fingerprint recognition of the fingerprint sensor.
- the material of the second shield structure 6 may be, for example, an organic material that is opaque to light, such as a black resin, such as a resin material to which black shading particles are added.
- the material of the second light shielding structure that is opaque is not limited to the above types.
- the second shield structure 6 is light transmissive, and the angle between the second side 402 of the first shield structure 4 and the plane in which the aperture stop 2 is located ⁇ is an obtuse angle, and the refractive index of the second shield structure 6 is greater than the refractive index of the first shield structure 4 to constitute total reflection.
- the refractive index of the second shielding structure 6 is greater than the refractive index of the first shielding structure 4, when the interference light is incident through the second shielding structure 6 to the second side 402 of the first shielding structure 4, the full satisfaction is satisfied.
- the reflected condition light can be totally reflected on the second side 402 of the first shield structure 4, thereby reducing the interference light that the via 5 is incident on the sensing unit.
- the angle ⁇ between the second side 402 of the first shielding structure 4 and the plane of the aperture stop 2 is an obtuse angle, which can increase the incidence from the second shielding structure 6 to the first An incident angle of light of the second side 402 of the shield structure 4 such that more light can be totally reflected on the second side 402 of the first shield structure 4 to reduce interference light entering the sensing unit through the aperture 5, Thereby improving the accuracy of the fingerprint recognition device.
- the material of the second shielding structure 6 may be silicon dioxide, silicon nitride or titanium dioxide having a higher refractive index; the material of the first shielding structure 4 may be fluorine having a lower refractive index.
- Magnesium, porous silica or fluorosilicon oxide may be used as the material of the second shield structure 6 and the material of the first shield structure 4 as long as the above requirements are met.
- FIG. 2E is a partial cross-sectional view of still another fingerprint recognition device according to an embodiment of the present disclosure.
- the second side surface 402 of the first shielding structure 4 is a curved surface that is convex toward the second shielding structure 6.
- the tangent of the curved surface is between the plane of the aperture-shaped aperture 2
- the angle ⁇ is an obtuse angle.
- the curvatures of the respective positions of the second side surface 402 of the first shielding structure 4 are different, it is advantageous to make the direction along the second side surface 402 beveled.
- the interference light incident from the second shielding structure 6 to the second side surface 402 of the first shielding structure 4 is totally reflected, so that more interference light can be prevented from entering the sensing unit through the hole 5, thereby improving the accuracy of the fingerprint identification device. degree.
- the apertured aperture includes an opaque material, such as a portion of the apertured aperture other than the aperture comprising an opaque material.
- the opaque material may be formed of an opaque material.
- the opaque material may be, for example, an opaque inorganic material such as a metal material or alloy such as aluminum, chromium, copper, aluminum alloy, nickel alloy, copper alloy, or the like.
- the opaque material may be, for example, an organic material such as a black resin.
- the material of the apertured aperture may comprise a photosensitive material such that the apertured aperture can be easily fabricated by photolithographic methods.
- the photosensitive material may include a photoresist material or a metal halide such as a silver halide (for example, AgCl or AgBr).
- a hole-shaped aperture may be formed through an exposure-development process, and the metal halide may decompose to form metal particles after exposure, and the metal particles may appear black due to small particles to achieve a hole-like aperture other than the aperture.
- Part of the material is opaque.
- the material of the apertured aperture is not limited to the above-mentioned ones, and the material of the portion other than the aperture of the apertured aperture is not limited as long as it is an opaque material.
- the sensing unit 301 may include components such as a photoelectric conversion element (for example, a photodiode, a phototransistor, etc.) and a switching transistor electrically connected to the photoelectric conversion element, and the photoelectric conversion element may convert an optical signal irradiated thereto into an electrical signal.
- the switching transistor can control whether to read an electrical signal obtained by collecting an optical signal on the photoelectric conversion element.
- the photodiode is a photodiode.
- the fingerprint identification device further includes a fingerprint recognition detection module and a processor.
- 2F is a block diagram of a driving principle of an image sensor according to an embodiment of the present disclosure.
- the fingerprint recognition driving module may be a fingerprint recognition driving circuit
- the fingerprint recognition driving circuit includes a fingerprint identification row driving circuit and a fingerprint identification column driving circuit.
- the fingerprint recognition driving circuit row driving circuit includes a plurality of sensing gate lines respectively connected to the respective sensing units 301 arranged in an array
- the fingerprint identification column driving circuit includes respectively connected to the respective sensing units 301 arranged in an array.
- a plurality of sensing data lines are provided to provide a scanning signal for the sensing unit 301.
- the fingerprint recognition detection module may be a fingerprint recognition detection circuit that is connected to each sensing unit 301 of the fingerprint sensor to read an electrical signal from the sensing unit 301.
- the fingerprint recognition detection circuit is coupled to the processor signal, and the fingerprint recognition detection circuit transmits the electrical signal to the processor, and the processor processes the received electrical signal, for example, the electrical signal corresponds to a pre-stored standard fingerprint.
- the data signals are compared to achieve fingerprint recognition.
- the processor can be a digital signal processor (DSP), a programmable logic controller (PLC), or the like.
- DSP digital signal processor
- PLC programmable logic controller
- the fingerprint recognition driving circuit and the fingerprint recognition detecting circuit may be prepared on the same substrate as the sensing unit 301, or separately provided and electrically connected to each sensing unit 301.
- the driving structure of the fingerprint sensor, the fingerprint identification detecting structure, and the type and connection mode of the processor are not limited to the above examples, and the embodiments of the present disclosure are not limited thereto, and those skilled in the art may refer to the prior art in the art.
- At least one embodiment of the present disclosure further provides a display panel, which includes any of the fingerprint recognition devices provided by the embodiments of the present disclosure.
- FIG. 3A is a schematic plan view of a display panel according to an embodiment of the present disclosure
- FIG. 3B is a schematic plan view of a region in which a sensing unit is disposed in a display panel according to an embodiment of the present disclosure.
- FIG. 3D is a schematic plan view showing another area in which a sensing unit is disposed in a display panel according to an embodiment of the present disclosure. .
- the display panel 11 further includes a display pixel array 8.
- a fingerprint sensor may be disposed in a region 13 of the display panel provided with a sensing unit for receiving light reflected by the finger.
- the area 13 provided with the sensing unit may correspond to a partial area of the display pixel array 8 of the display panel 11.
- the area 13 provided with the sensing unit may also correspond to the entire display pixel array 8 of the display panel 11 to increase the photosensitive area of the fingerprint sensor, thereby achieving a better fingerprint recognition effect.
- the display pixel array 8 includes a plurality of pixel units 801 arranged in an array, a first shield structure (not shown in FIGS. 3B-3D) and a hole 5 disposed between the pixel units 801. Clearance.
- the position of the hole 5 in the apertured aperture 2 can be set according to the actual application requirements, and the embodiment of the present disclosure does not specifically limit this.
- each of the holes 5 may be disposed between two adjacent pixel units 801; for example, as shown in FIG. 3C, each of the holes 5 may be disposed in adjacent four pixel units 801. Further, for example, as shown in FIG. 3D, each of the three pixel units 801 may correspond to one hole 5, whereby the number of sets of the sensing unit 301 and the manufacturing cost can be reduced.
- the position at which the hole 5 is formed in the apertured aperture 2 is not limited to the above.
- FIG. 3B is a cross-sectional view taken along line BB' of FIG. 3B
- FIG. 4B is a partial cross-sectional view of a display panel according to an embodiment of the present disclosure
- FIG. 4C is another display according to an embodiment of the present disclosure.
- the display pixel array 8 includes a plurality of pixel units 801 distributed in an array and display elements at least in the pixel unit 801, the display elements including a conductive layer, that is, the display pixel array 8 includes at least A conductive layer in the pixel unit 801.
- the display panel 11 is an organic light emitting diode display panel, and the disclosure is described by way of example.
- the display element may be an organic light emitting diode device, and the organic light emitting diode device may be a structure such as a top emission, a bottom emission, or the like.
- the organic light emitting diode device includes a first electrode 802, an organic light emitting layer 803, and a second electrode 804.
- the first electrode 802 and the second electrode 804 are the conductive layers.
- the first electrode 802 is disposed on the base substrate 1.
- the first electrode 802 may be disposed on the aperture stop 2.
- the organic light emitting layer 803 is disposed on the first electrode 802.
- the second electrode 804 is a common electrode that covers the organic light emitting layer 803, the first shield structure 4, and the second shield structure 6.
- the display panel is not limited to being an organic light emitting display panel, and correspondingly, the display element is not limited to the above-described organic light emitting diode device.
- the display panel 11 also includes a display driving circuit.
- the display driving circuit includes a signal line or the like, for example, a plurality of display gate lines and display data lines (not shown) connected to each pixel unit of the display pixel array to provide scan signals and data signals for the pixel units of the display pixel array.
- the fingerprint recognition row driving circuit and the fingerprint identification column driving circuit of the display driving circuit and the image sensor can all refer to conventional designs in the art, for example, the row driving circuit and the column driving circuit can be integrated in the same control circuit or chip, the present disclosure The embodiment does not limit this.
- the first electrode 802 can be an anode and the second electrode 804 can be a cathode.
- the anode when the anode is a common electrode, when the display panel 11 performs a display function, a low-level signal is input to the common electrode through the display driving circuit.
- the anode may be a reflective electrode or a reflective layer (not shown) disposed adjacent to the anode, during which light exits from the cathode side for display.
- the second electrode 804 may also be an anode, the first electrode 802 being a cathode, for example, the anode being a common electrode.
- a high level signal is input to the common electrode through the display drive circuit.
- the display pixel array 8 further includes a pixel defining layer defining a plurality of pixel units to prevent crosstalk between adjacent pixel units or adjacent pixel units.
- the pixel defining layer includes an opening corresponding to the pixel unit 801, and the organic light emitting layer 803 is disposed at least in the opening, for example, the common electrode covers the pixel defining layer.
- the first shielding structure 4 can also be configured as a part of the pixel defining layer, so that the first shielding structure does not need to be additionally provided to achieve the effect of simplifying the structure of the display panel.
- the first shielding structure 4 is light transmissive, that is, the pixel defining layer is light transmissive, however, since the second shielding structure 6 and the first shielding structure 4 constitute a total reflection structure, it may be improved or A problem of preventing crosstalk between light between adjacent pixel units or adjacent pixel units. At the same time, compared with the display panel in which the pixel defining layer is opaque, it is advantageous to increase the aperture ratio of the display panel.
- the second shielding structure 6 may also be configured as a spacer for supporting the display pixel array, for example, a spacer for supporting the encapsulation layer 9, for example, the encapsulation layer 9 is a package cover, etc. .
- the display panel 11 may also be a liquid crystal display panel
- the second shielding structure 6 may also be configured as a column spacer in the liquid crystal display panel for supporting the base substrate and the opposite substrate of the liquid crystal display panel.
- the first shielding structure when the first shielding structure is the structure shown in FIG. 2A or 2B, the first shielding structure may also be configured as the spacer.
- the fingerprint sensor 3 is located on the side of the base substrate 1 away from the aperture stop 2.
- the fingerprint sensor 3 may also be located between the apertured aperture 2 and the base substrate 1, such that when fingerprinting is performed, the light reflected by the finger is directly after passing through the aperture 5.
- the loss of this portion of light can be reduced, thereby improving the accuracy of fingerprint recognition.
- the other structures of the display panel 11 shown in FIG. 4B are the same as those in FIG. 4A. Please refer to the previous description, and details are not described herein again.
- the apertured aperture may be in the same layer as the conductive layer of the display pixel array.
- the aperture stop 2 is located in the same layer as the first electrode 802, that is, both the aperture aperture 2 and the first electrode 802 are located on the fingerprint sensor 3 and both are associated with the fingerprint sensor 3.
- the top surface of the contact, or the aperture stop 2 is in the same plane as the top surface of the first electrode 802.
- the fingerprint identification device includes any one of the first shielding structures shown in FIGS. 2A-2C without including the second shielding structure.
- the fingerprint recognition device in the display panel 11 may include the first shield structure 4 shown in FIG. 2B, and the first shield structure 4 is also configured as a spacer.
- the fingerprint recognition device in the display panel 11 may include the first shield structure 4 shown in FIG. 2C, and the first shield structure 4 is also configured as a pixel defining layer.
- the other structures of the display panel 11 shown in FIGS. 4D and 4E are the same as those in FIG. 4A, please refer to the previous description.
- FIG. 5 is a schematic diagram of an optical path when the display panel shown in FIG. 4B performs fingerprint recognition.
- the following is an example of the display panel shown in FIG. 4B.
- the fingerprint identification optical path and effect of the display panel provided by other embodiments are similar.
- the finger touches the fingerprint recognition area corresponding to the display pixel array of the display panel, and the light emitted from the organic light-emitting layer 803 is incident on the surface of the finger that is in contact with the display panel 11.
- the first shielding structure 4 and the second screen shielding structure 6 are respectively capable of blocking at least a portion of the interference light around the aperture 5 (light that is not reflected by the finger, such as ambient light, backlight, light from the organic light-emitting layer, etc.) Incident to the hole 5, thereby reducing interference light incident to the fingerprint sensor 3 via the hole 5; on the other hand, the first shielding structure 4 and the second shielding structure 6 form a total reflection structure, and a part is incident from the second light shielding structure 6 to the first The interference light of a shield structure 4 can be totally reflected on the second side 402 of the first shield structure 4, thereby reducing disturbing light entering the sensing unit through the aperture 5. Therefore, in the display panel provided by the embodiment of the present disclosure, the accuracy of fingerprint recognition can be improved, which can enable
- the light incident on the finger may also be light from a backlight or the like.
- At least one embodiment of the present disclosure further provides a display device including any display panel provided by an embodiment of the present disclosure.
- FIG. 6 is a schematic diagram of a display device according to an embodiment of the present disclosure.
- the display device 12 includes any of the display panels 11 provided by the embodiments of the present disclosure.
- the display device may be an organic light emitting diode display device, a liquid crystal display device, or the like.
- the display device can be implemented as a product, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, an electronic advertisement screen, or the like.
- FIG. 6 is a schematic diagram of a display device including any of the display panels provided by the embodiments of the present disclosure. Other structures of the display device are not shown, and those skilled in the art may refer to the conventional technology, which is not limited in this embodiment.
- the display device provided by the embodiment of the present disclosure can implement fingerprint recognition in an area corresponding to the display pixel array, that is, perform fingerprint identification in the display area.
- the display device provided by the embodiment of the present disclosure can reduce or prevent interference light from entering the fingerprint sensor when performing fingerprint recognition, so that the accuracy of fingerprint recognition can be improved, which can enable the user to obtain a better fingerprint recognition experience.
- At least one embodiment of the present disclosure further provides a method for fabricating a display panel, the method for fabricating a display panel, comprising: providing a fingerprint sensor, the fingerprint sensor comprising a plurality of sensing units; forming the hole on a light incident side of the fingerprint sensor
- the apertured aperture includes a hole; a first shielding structure is formed on a side of the apertured aperture that faces away from the fingerprint sensor, wherein the first shielding structure surrounds at least a portion of the aperture.
- FIG. 7A-7I is a schematic diagram of a method for fabricating a display panel according to an embodiment of the present disclosure.
- a base substrate 1 and a fingerprint sensor 3 are provided.
- the fingerprint sensor 3 includes a plurality of sensing units. For example, multiple sensing units are arranged in an array.
- the fingerprint sensor 3 is placed on the base substrate 1, or the fingerprint sensor 3 is fabricated directly on the base substrate 1 by a semiconductor process or the like.
- a pixel circuit (not shown) for driving the organic light emitting diode device may be formed on the base substrate 1, which includes a plurality of thin film transistors, storage capacitors, and the like, and the preparation method thereof may be any known in the art. Methods, materials, etc., will not be described here.
- a pre-formed pupil layer 201 for forming an array of holes is formed on the fingerprint sensor 3.
- the material of the pre-formed pupil layer 201 includes an opaque material, for example, it may be an opaque inorganic material such as a metal material or alloy such as aluminum, chromium, copper, aluminum alloy, nickel alloy, copper alloy, or the like.
- the opaque material may, for example, also be an organic material such as a black resin.
- the material of the pre-formed pupil layer 201 may also be a photosensitive material, so that the apertured aperture can be easily fabricated.
- the photosensitive material may include a photoresist material or a metal halide such as a silver halide (for example, AgCl or AgBr).
- the material of the pre-formed aperture layer is not limited to the above-listed types, and the embodiment of the present disclosure does not limit this.
- the material of the pre-formed pupil layer 201 is an organic material, for example, it may be formed by a coating method; when the material of the pre-formed pupil layer 201 is an inorganic material, for example, it may be formed by a deposition method, such as magnetron sputtering. Deposition, chemical vapor deposition, etc., a person skilled in the art can select a suitable fabrication method according to the specific material of the pre-formed pupil layer 201.
- an aperture array is formed by using a pre-fabricated pupil layer 201 by a patterning process, thereby forming a hole-shaped aperture 2 including a plurality of apertures 5 arranged in an array on the light incident side of the fingerprint sensor 3.
- the holes 5 can be formed using a photolithography process.
- the material of the pre-formed pupil layer 201 is a photosensitive material including a photoresist material and a metal halide (for example, AgCl or AgBr)
- the apertured aperture 2 can be formed by an exposure-development process in conjunction with a mask.
- the metal halide decomposes after exposure to form metal particles which appear black due to the small particles, so that the material of the portion other than the holes 5 of the apertured aperture is opaque.
- the aperture-shaped aperture 2 can be formed by a process of exposure-developing-etching-ashing.
- the patterning process for forming the hole array layer is not limited to the above categories.
- a first light shielding layer 404 for forming a first shielding structure is formed on the aperture stop 2.
- the material of the first light shielding layer 404 can refer to the description of the material of the previous first shielding structure.
- the material of the first light shielding layer 404 is an organic material, for example, it may be formed by a coating method; when the material of the first light shielding layer 404 is an inorganic material, for example, it may be formed by a deposition method, such as magnetron control. Sputter deposition, chemical vapor deposition, etc., a person skilled in the art can select a suitable fabrication method according to the specific material of the first light shielding layer 404.
- a first shielding structure 4 is formed by a patterning process using a first light shielding layer 404, such as a photolithography process or the like.
- the first shielding structure 4 is light transmissive, including a portion surrounding the aperture 5, and the first shielding structure 4 covers the aperture 5.
- the angle ⁇ between the tangent to the second side 402 of the first shield structure 4 and the plane in which the aperture stop 2 is located is an obtuse angle.
- the first light shielding layer 404 is etched and patterned by a wet etching method, so that an under-cut configuration can be realized.
- the light reflected by the finger is transmitted through the first shielding structure 4 to enter the hole 5, and then incident on the sensing unit of the sensor to realize fingerprint recognition.
- the portion of the first shield structure 4 surrounding the hole 5 can reduce the interference light incident on the sensing unit through the hole 5 by the occlusion function, thereby improving the accuracy of the fingerprint recognition device.
- a second light shielding layer 601 for forming a second shielding structure is formed on the first shielding structure 4 and the aperture stop 2.
- the material of the second light shielding layer 601 can refer to the description of the material of the previous second shielding structure.
- the material of the second light shielding layer 601 is an organic material, for example, it may be formed by a coating method; when the material of the second light shielding layer 601 is an inorganic material, for example, it may be formed by a deposition method, such as magnetron control. Sputter deposition, chemical vapor deposition, etc., a person skilled in the art can select a suitable fabrication method according to the specific material of the second light shielding layer 601.
- the first shielding structure 4 is formed by a patterning process using a second light shielding layer 601, such as a photolithography process or the like.
- the second shielding structure 6 covers at least the second side 402 of the first shielding structure 4 remote from the aperture 5 and includes a second opening 702 corresponding to the aperture 5.
- the second shielding structure 6 is light transmissive, and the refractive index of the second shielding structure 6 is greater than the refractive index of the first shielding structure 4 to constitute total reflection.
- the angle ⁇ between the tangent of the second side surface 402 of the first shielding structure 4 and the plane in which the aperture stop 2 is located is an obtuse angle, this can increase the incidence of the second shielding structure 6 incident on the first shielding structure 4
- the incident angle of the light of the two side faces 402 therefore, more light can be totally reflected on the second side 402 of the first shielding structure 4 to reduce the interference light entering the sensing unit through the hole 5, thereby improving the fingerprint identification device Accuracy.
- the materials of the first shielding structure and the second shielding structure may refer to the previous description, and details are not described herein again.
- the display panel fabrication method further includes forming a display function device, such as an organic light emitting diode device, at least in the display pixel unit 801.
- a first electrode 802, an organic light emitting layer 803, and a second electrode 804 are sequentially formed to form an organic light emitting diode device.
- the second electrode 804 is a common electrode covering the organic light emitting layer 803, the first shield structure 4, and the second shield structure 6.
- a first electrode 802, an organic light emitting layer 803, and a second electrode 804 can be formed by those skilled in the art using conventional techniques in the art.
- the organic light emitting device is packaged using the encapsulation layer 9 to obtain the display panel 11.
- the encapsulation layer 9 can be a thin film encapsulation layer or a package cover.
- a sealing filling material or a sealant may also be used in the packaging process, which is not shown in the drawings of the embodiments of the present disclosure, and those skilled in the art may adopt conventional techniques.
- the first shielding structure 4, the second shielding structure 6, and the holes 5 are disposed in a gap between the pixel units 801.
- the aperture ratio of the display panel 11 is not affected;
- the first shielding structure 4 is also configured to display a pixel defining layer of the pixel array defining each pixel unit, and the second shielding structure 6 is further configured to display
- a spacer for supporting the pixel array, such as a spacer, is used to support the encapsulation layer 9, for example, the encapsulation layer 9 is a package cover. In this way, it is not necessary to additionally provide a pixel defining layer and a spacer to simplify the structure of the display panel.
- FIGS. 8A-8C are schematic diagrams showing another method of fabricating a display panel according to an embodiment of the present disclosure.
- the method differs from the method shown in FIGS. 7A-7I in that, as shown in FIG. 8A, after the process illustrated in FIGS. 7A-7D is completed, the first light shielding layer 404 is patterned to form a structure as shown in FIG. 8A.
- the first shielding structure 4 surrounds the entire aperture 5 and includes a first opening 701 that exposes the aperture 5 .
- the first shielding structure 4 may also partially surround the aperture 5 , ie the first shielding structure 4 surrounds the aperture 5 . Part of the outer contour.
- the first shielding structure 4 may be opaque or light-transmissive, and the blocking effect of the first shielding structure 4 on the light may reduce the interference light incident on the sensing unit 301 via the aperture 5, thereby improving the fingerprint sensor.
- the accuracy of fingerprint recognition can be referred to the previous description.
- a first electrode 802, an organic light-emitting layer 803, and a second electrode 804 which are at least located in the pixel unit 801 are sequentially formed.
- the second electrode 804 is a common electrode covering the organic light-emitting layer 803, the first shield structure 4, and the second shield structure 6.
- a first electrode 802, an organic light emitting layer 803, and a second electrode 804 can be formed by those skilled in the art using conventional techniques in the art.
- the organic light emitting device is packaged using the encapsulation layer 9 to obtain the display panel 11.
- the encapsulation layer 9 can be a thin film encapsulation layer or a package cover.
- a sealing filling material or a sealant may also be used in the packaging process, which is not shown in the drawings of the embodiments of the present disclosure, and those skilled in the art may adopt conventional techniques.
- the second shielding structure 6 is further configured to display the supporting spacers of the pixel array to simplify the structure of the display panel.
- FIGS. 9A-9C are schematic diagrams showing still another method of fabricating a display panel according to an embodiment of the present disclosure.
- the method differs from the method shown in FIGS. 7A-7I in that, as shown in FIG. 9A, after the process illustrated in FIGS. 7A-7D is completed, the first light shielding layer 404 is patterned to form a phase as shown in FIG. 9A.
- the first shielding structure 4 is light transmissive, including a portion surrounding the aperture 5, and the first shielding structure 4 covers the aperture 5.
- the portion of the first shield structure 4 surrounding the hole 5 can reduce the interference light incident on the sensing unit through the hole 5 by the occlusion function, thereby improving the accuracy of the fingerprint recognition device.
- the first electrode 802, the organic light-emitting layer 803, and the second electrode 804 which are located at least in the pixel unit 801 are sequentially formed.
- the second electrode 804 is a common electrode covering the organic light emitting layer 803, the first shield structure 4, and the second shield structure 6.
- a first electrode 802, an organic light emitting layer 803, and a second electrode 804 can be formed by those skilled in the art using conventional techniques in the art.
- the organic light emitting device is packaged using the encapsulation layer 9 to obtain the display panel 11.
- the encapsulation layer 9 can be a thin film encapsulation layer or a package cover.
- a sealing filling material or a sealant may also be used in the packaging process, which is not shown in the drawings of the embodiments of the present disclosure, and those skilled in the art may adopt conventional techniques.
- the first shielding structure 4 is further configured to display a pixel defining layer of the pixel array defining each pixel unit to simplify the structure of the display panel.
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Abstract
Description
Claims (19)
- 一种指纹识别装置,包括:指纹传感器,包括多个传感单元;孔状光阑,设置于所述指纹传感器的入光侧且包括孔,所述孔允许光经由其入射至所述指纹传感器的至少一个传感单元;以及第一屏蔽结构,设置于所述孔状光阑的背离所述指纹传感器的一侧,且至少部分围绕所述孔。
- 根据权利要求1所述的指纹识别装置,其中,所述第一屏蔽结构是透光的且包括暴露所述孔的第一开口;所述第一屏蔽结构的靠近所述孔的第一侧面与所述孔状光阑所在的平面之间的外夹角为钝角。
- 根据权利要求1所述的指纹识别装置,其中,所述第一屏蔽结构是不透光的且包括暴露所述孔的第一开口。
- 根据权利要求1所述的指纹识别装置,其中,所述第一屏蔽结构是透光的且覆盖所述孔。
- 根据权利要求4所述的指纹识别装置,还包括:第二屏蔽结构,至少覆盖所述第一屏蔽结构的远离所述孔的第二侧面且包括对应于所述孔的第二开口。
- 根据权利要求5所述的指纹识别装置,其中,所述第二屏蔽结构是透光的;所述第一屏蔽结构的第二侧面或所述第二侧面的切面与所述孔状光阑所在平面之间的夹角为钝角;所述第二屏蔽结构的折射率大于所述第一屏蔽结构的折射率。
- 根据权利要求6所述的指纹识别装置,其中,所述第一屏蔽结构的第二侧面为朝向靠近所述第二屏蔽结构凸出的曲面,所述曲面的切线与所述孔状光阑所在平面之间的夹角为钝角。
- 根据权利要求1-7任一所述的指纹识别装置,其中,所述孔状光阑包括不透光材料。
- 根据权利要求1-8任一所述的指纹识别装置,其中,所述第一屏蔽结 构配置为减少或阻挡经由所述孔入射至所述至少一个传感单元的环境光。
- 一种显示面板,包括权利要求1-9任一所述的指纹识别装置。
- 根据权利要求10所述的显示面板,还包括:显示像素阵列,包括多个呈阵列排布的像素单元;其中,所述第一屏蔽结构和所述孔设置于所述多个像素单元之间的间隙。
- 根据权利要求11所述的显示面板,其中,所述第一屏蔽结构还配置为所述显示像素阵列的限定各个所述像素单元的像素界定层。
- 根据权利要求11所述的显示面板,其中,所述第一屏蔽结构还配置为所述显示像素阵列的用于支撑的隔垫物。
- 根据权利要求13所述的显示面板,其中,所述指纹识别装置还包括第二屏蔽结构,所述第二屏蔽结构配置为所述显示像素阵列的用于支撑的隔垫物。
- 根据权利要求11所述的显示面板,其中,所述显示像素阵列包括至少位于所述像素单元中的导电层,所述孔状光阑与所述导电层位于同一层。
- 根据权利要求10-15任一所述的显示面板,还包括衬底基板,所述孔状光阑位于所述衬底基板上,所述指纹传感器位于所述孔状光阑与所述衬底基板之间。
- 一种显示装置,包括权利要求10-16任一所述的显示面板。
- 一种显示面板制作方法,包括:提供指纹传感器,所述指纹传感器包括多个传感单元;在所述指纹传感器的入光侧形成所述孔状光阑,所述孔状光阑包括孔;在所述孔状光阑的背离所述指纹传感器的一侧形成第一屏蔽结构,其中,所述第一屏蔽结构围绕至少部分所述孔。
- 根据权利要求18所述的显示面板制作方法,还包括:在所述第一屏蔽结构和所述孔状光阑上形成第二屏蔽结构,所述第二屏蔽结构至少覆盖所述第一屏蔽结构的远离所述孔的第二侧面且包括对应于所述孔的第二开口。
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US16/472,438 US11354927B2 (en) | 2018-04-24 | 2018-12-06 | Fingerprint identification device, display panel and fabrication method thereof, and display device |
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US11644360B2 (en) | 2019-11-15 | 2023-05-09 | Lite-On Opto Technology (Changzhou) Co., Ltd. | Light sensing module and electronic device using the same |
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CN108596096B (zh) | 2018-04-24 | 2021-01-22 | 京东方科技集团股份有限公司 | 指纹识别装置、显示面板及其制作方法、显示装置 |
CN109449181B (zh) * | 2018-10-29 | 2021-01-15 | 京东方科技集团股份有限公司 | 显示基板及其制作方法、显示装置 |
CN109670448B (zh) * | 2018-12-20 | 2021-02-23 | 武汉华星光电半导体显示技术有限公司 | 显示屏的指纹识别结构 |
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