CN108960196B - Fingerprint identification structure and display panel - Google Patents
Fingerprint identification structure and display panel Download PDFInfo
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- CN108960196B CN108960196B CN201810836497.9A CN201810836497A CN108960196B CN 108960196 B CN108960196 B CN 108960196B CN 201810836497 A CN201810836497 A CN 201810836497A CN 108960196 B CN108960196 B CN 108960196B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The invention provides a fingerprint identification structure and a display panel, belongs to the technical field of fingerprint identification and display, and can at least partially solve the problem that crosstalk is easy to occur in the existing fingerprint identification structure. The fingerprint identification structure of the invention comprises a plurality of identification units which are arranged in an array; each identification unit comprises an emission module and a sensing module, and the sensing module is arranged at a position capable of receiving light emitted by the emission module and reflected by fingerprints; in each identification unit, the wavelength of light which can be sensed by the sensing module is the same as the wavelength of light emitted by the emitting module; wherein the wavelengths of the light emitted by the emitting modules in at least part of the adjacent identification units are different.
Description
Technical Field
The invention belongs to the technical field of fingerprint identification and display, and particularly relates to a fingerprint identification structure and a display panel.
Background
The existing fingerprint identification structure, such as an on-screen fingerprint identification panel, is to arrange emitting modules distributed in an array and sensing modules distributed in an array on a panel with a display function. One transmitting module corresponds to one sensing module. The light emitted by the emitting module is reflected to the corresponding sensing module after being directed to the fingerprint, and the valleys and ridges of the fingerprint are distinguished according to the intensity of the reflected light (the intensity of the reflected light represents the ridges of the fingerprint corresponding to the position of the emitting module, and the intensity of the reflected light represents the valleys of the fingerprint corresponding to the position of the emitting module). However, there is a risk that light emitted from one emitting module is reflected by the fingerprint and then emitted to an adjacent sensing module, i.e., crosstalk occurs, thereby causing a decrease in the accuracy of fingerprint identification.
Disclosure of Invention
The invention at least partially solves the problem of crosstalk of the existing fingerprint identification structure and provides a fingerprint identification structure and a display panel.
According to a first aspect of the present invention, there is provided a fingerprint identification structure comprising a plurality of identification cells arranged in an array;
each identification unit comprises an emission module and a sensing module, and the sensing module is arranged at a position capable of receiving light emitted by the emission module and reflected by fingerprints;
in each identification unit, the wavelength of light which can be sensed by the sensing module is the same as the wavelength of light emitted by the emitting module;
wherein the wavelengths of the light emitted by the emitting modules in at least part of the adjacent identification units are different.
Optionally, the wavelengths of the light emitted by the emitting modules in any two adjacent identification units are different.
Optionally, the wavelengths of the light emitted by the emitting module of the identification unit are periodically distributed in two different directions perpendicular to the normal of the plane where the identification unit is located.
Optionally, the identification units are distributed into a plurality of identical identification unit arrays, the row direction of all the identification unit arrays has the same number of identification units, the column direction of all the identification unit arrays has the same number of identification units, the wavelengths of the light emitted by the emission modules of the identification units at the same position in any two identification unit arrays are the same, and the wavelengths of the light emitted by the emission modules of any two identification units in each identification unit array are different.
Optionally, the emitting module comprises a micro-infrared emitting diode and the sensing module comprises a micro-infrared photodiode.
Optionally, the wavelengths of the light emitted by the emitting modules in some of the identification units are the same, and the sensing modules in any two identification units emitting light with the same wavelength are located at positions where the light emitted by the other identification unit and reflected by the fingerprint cannot be received.
Optionally, the fingerprint identification structure includes a light emitting surface, light emitted by the emission modules is emitted to a fingerprint through the light emitting surface, an emission surface of each emission module and a receiving surface of the sensing module are located in the same plane, a distance between the plane and the light emitting surface is d, and a center distance L between the sensing module in any two identification units emitting light with the same wavelength and an opposite emission module satisfies the following formula: and L is more than 2dtan theta, wherein theta is a critical incident angle when light emitted to the light-emitting surface from the interior of the fingerprint identification structure is totally reflected.
According to a second aspect of the present invention, there is provided a display panel comprising the fingerprint identification structure provided by the first aspect of the present invention.
Optionally, the display panel includes a first substrate, and sub-pixels distributed in an array are disposed on one side of a light emitting surface of the first substrate;
the emitting module and the sub-pixel are arranged on the same layer and are arranged in the gap of the adjacent sub-pixel, and/or the sensing module and the sub-pixel are arranged on the same layer and are arranged in the gap of the adjacent sub-pixel.
Optionally, the sub-pixels comprise micro light emitting diodes capable of emitting visible light.
Optionally, a sensor substrate is further disposed on a side of the first substrate away from the light exit side, and the sensing module is disposed on the sensor substrate.
Drawings
FIG. 1 is a schematic structural diagram of a fingerprint identification structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a fingerprint identification structure according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 4 is a distribution diagram of wavelengths corresponding to each recognition unit of the recognition unit array in the fingerprint recognition structure according to the embodiment of the present invention;
wherein the reference numerals are: 1. an identification unit; 11. a transmitting module; 12. a sensing module; 13. a light-emitting surface; 2. a first substrate; 3. a sensor substrate; 4. a second substrate; 100. a fingerprint; r, red subpixel; G. a green sub-pixel; B. a blue subpixel.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
the present embodiment provides a fingerprint identification structure, as shown in fig. 1 and 2, comprising a plurality of identification units 1 arranged in an array; each identification unit 1 comprises an emitting module 11 and a sensing module 12, wherein the sensing module 12 is arranged at a position capable of receiving light emitted by the emitting module 11 and reflected by the fingerprint 100; in each identification unit 1, the wavelength of light that the sensing module 12 can sense is the same as the wavelength of light emitted by the emitting module 11; wherein the wavelengths of the light emitted by the emitting modules 11 in at least some adjacent identification units 1 are different.
The emitting modules 11 are paired with sensing modules 12, and the sensing modules 12 are used for sensing the light emitted by the corresponding emitting modules 11 and reflected by the fingerprint 100. The emitting module 11 is, for example, a micro-infrared emitting diode, and the sensing module 12 is, for example, a micro-infrared photodiode. The infrared radiation emitted by the micro infrared emitting diode is directed to the fingerprint 100 and reflected to the micro infrared photodiode. The micro-infrared photodiode converts the received infrared light into an electrical signal (e.g., a current signal). Since the paths from the infrared rays to the valleys and ridges of the fingerprint 100 to the infrared photodiode are not the same, the infrared rays are not attenuated differently, and thus whether the fingerprint 100 corresponding to a certain recognition unit 1 is a valley or a ridge can be determined by analyzing the electrical signal.
Specifically, the wavelength of light emitted by the micro-infrared emitting diode can be adjusted by adjusting the content ratio of elements such as In and Ga In the quantum well layer, or adjusting the magnitude of the injection current.
Specifically, the micro infrared photodiode may be an organic infrared photodiode, or may be a micro infrared photodiode formed of an inorganic material such as CuInGaSn, CuCdZnSnSe, or the like. The wavelength of infrared rays sensed by the micro infrared photodiode can be adjusted by adjusting the ion ratio of the photosensitive material therein and increasing or decreasing the functional groups.
Specifically, the pair of the emitting module 11 and the sensing module 12 may be disposed on the same layer, and the emitting module 11 may be closer to the fingerprint 100, or the sensing module 12 may be closer to the fingerprint 100. In either arrangement, it is necessary to ensure that the sensing module 12 can receive the light reflected by the fingerprint 100 from the corresponding emitting module 11.
The wavelengths of the light emitted by the emitting modules 11 in the adjacent identification units 1 are different, and the wavelengths of the light sensed by the sensing modules 12 corresponding to the emitting modules 11 are naturally different. After light emitted by one of the emitting modules 11 is reflected by the fingerprint 100, the light strikes the sensing module 12 corresponding to the adjacent emitting module 11, and then the sensing module 12 corresponding to the adjacent emitting module 11 does not respond to the excitation of the part of light, so that it is ensured that the sensing modules 12 only sense the light emitted by the corresponding emitting module 11, and the electrical signals generated by the sensing modules 12 only reflect the depth of the fingerprint 100 at the position of the corresponding fingerprint 100, thereby avoiding crosstalk between the adjacent identification units 1.
Alternatively, the wavelengths of the light emitted by the emitting modules 11 in any two adjacent identification cells 1 are different. For example, the wavelength of the light emitted by the emitting modules 11 in all the identification cells 1 is different in the entire fingerprint identification structure. In this way, it is ensured that no crosstalk occurs between all adjacent identification cells 1.
Alternatively, the wavelengths of the light emitted by the emitting modules 11 of the identification unit 1 are periodically distributed in two different directions perpendicular to the normal of the plane in which the identification unit 1 is located. I.e. the wavelengths of the light emitted by the emitting modules 11 of the identification unit 1 are periodically distributed in two different directions in the plane of the identification unit 1. The number of wavelengths of light corresponding to the emitting module 11 in the whole fingerprint identification structure is limited, and the manufacturing is convenient.
Alternatively, the identification units 1 are distributed into a plurality of identical identification unit arrays, the row direction of all the identification unit arrays has the same number of identification units 1, the column direction of all the identification unit arrays has the same number of identification units 1, the wavelengths of the light emitted by the emission modules 11 of the identification units 1 at the same position in any two identification unit arrays are the same, and the wavelengths of the light emitted by the emission modules 11 of any two identification units 1 in each identification unit array are different. That is, the wavelengths of the light emitted by the emitting modules 11 of the identification unit 1 are periodically distributed in two mutually perpendicular directions of the rows and columns, and the identification unit 1 thus distributed matches the distribution mode of the sub-pixels in the conventional display panel, and is more easily integrated with the display panel into a whole structure.
For example, in fig. 3, the wavelength of the light emitted by the emission module 11 is according to λ in the left-to-right direction of fig. 31、λ2、λ3The order of (i) is periodically arranged (for simplicity, the wavelength distribution in only one direction is shown in the figure, but it should be understood that the actual identification cell array should be composed of m × n identification cells in both the row and column directions).
FIG. 4 is a diagram showing a distribution of wavelengths corresponding to each identification cell 1 in an identification cell array, wherein each λ represents an identification cell 1 corresponding to a wavelength (only the wavelength distribution is shown in the figure, and not the identification cells 1 are shown in close proximity), from λ11To lambdannThese wavelengths are all different. The fingerprint identification structure is composed of a plurality of identification unit arrays.
Alternatively, as shown in fig. 2, the wavelengths of the light emitted by the emitting modules 11 in some of the identification units 1 are the same, and the sensing modules 12 in any two identification units 1 emitting light with the same wavelength are located at positions where the light emitted by the other identification unit 1 and reflected by the fingerprint 100 cannot be received.
The arrangement is to ensure that light emitted by the emitting module 11 and not totally reflected at the light emitting surface 13 is reflected by the fingerprint 100 and does not irradiate to the adjacent sensing modules 12 responding to the same wavelength. The light emitted by the transmitting module 11 of the opposite party and received by the adjacent sensing modules 12 responding to the same wavelength is totally reflected light, and the part of light is regular and stable, and when the electric signal generated by the sensing modules 12 is analyzed, the influence of the part of light can be eliminated through an algorithm.
Alternatively, as shown in fig. 2, the fingerprint identification structure includes a light exit surface 13, light emitted by the emission modules 11 is emitted to the fingerprint 100 through the light exit surface 13, an emission surface of each emission module 11 and a receiving surface of the sensing module 12 are located in the same plane (the emission module 11 is not shown in fig. 2), a distance between the plane and the light exit surface is d, and a center distance L between the sensing module 12 and the opposite emission module 11 in any two identification units 1 emitting light with the same wavelength satisfies the following formula: l is more than 2dtan theta, and theta is a critical incident angle when light emitted to the light-emitting surface 13 from the interior of the fingerprint identification structure is totally reflected.
Referring to FIG. 2, the corresponding wavelength is λ1The distance between the adjacent emitting modules 11 and the sensing modules 12 is large enough, all the light emitted by the emitting module 11 corresponding to one sensing module 12 and capable of being reflected to the other sensing module 12 through the light emitting surface 13 is totally reflected light, or the non-total reflected light emitted by the emitting module 11 corresponding to one sensing module 12 and reflected back through the light emitting surface 13 is not emitted to the other sensing module 12. The above formula ignores the spacing in the vertical and horizontal directions between the sensing module 12 and the corresponding transmitting module 11.
Example 2:
the present embodiment provides a display panel, including the fingerprint identification structure provided in embodiment 1 of the present invention.
Specifically, in the display panel of this embodiment, the fingerprint identification structure provided in embodiment 1 may be used as a relatively independent component and attached to the display substrate in the display panel by, for example, an attaching manner, or the emitting module 11 and/or the sensing module 12 in the fingerprint identification structure provided in embodiment 1 may be integrated in a layer where the sub-pixels of the display panel are located.
Optionally, the display panel includes a first substrate 2, and sub-pixels (including a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B) are disposed on one side of the light exit surface 13 (also referred to as the light exit surface 13 for the light for fingerprint identification) of the first substrate 2; the emitting module 11 is disposed in the same layer with the sub-pixels and in the gap between the adjacent sub-pixels, and/or the sensing module 12 is disposed in the same layer with the sub-pixels and in the gap between the adjacent sub-pixels.
Since the emitting module 11 and the sensing module 12 are also typically formed of a specific semiconductor device, their manufacturing process may be compatible with the manufacturing process of the sub-pixels, so that the emitting module 11 and/or the sensing module 12 may be fabricated in the gap of the adjacent sub-pixels.
For example, as shown in fig. 3, the sub-pixels include micro light emitting diodes that emit visible light. The micro light emitting diodes, the aforementioned micro infrared light emitting diodes, can be simultaneously manufactured on one carrier substrate (e.g., sapphire substrate) and then transferred onto the first substrate 2 through a transfer step. By arranging the driving circuit on the first substrate 2, the micro light emitting diode can be driven to emit visible light for display and the micro infrared emitting diode can be driven to emit infrared light for fingerprint identification. In this embodiment, the thickness of the micro light emitting diodes and the micro infrared diodes may be selected to be 5-10 um. In this embodiment, the first substrate 2 is, for example, a glass substrate having a thickness of, for example, 0.5mm, on which TFT devices (constituting driving circuits for driving micro light emitting diodes and micro infrared light emitting diodes) are fabricated, and the line width of the TFT devices is selected to be 1 to 5 um.
Optionally, a sensor substrate 3 is further disposed on a side of the first substrate 2 away from the light exit side, and the sensing module 12 is disposed on the sensor substrate 3.
That is, as shown in fig. 3, the sensing module 12 is fabricated on the sensor substrate 3, and then the sensor substrate 3 is bonded to the first substrate 2, for example, by bonding. This arrangement can reduce the complexity of the internal circuit structure of the first substrate 2.
The thickness of the second substrate can be selected to be 0.5mm, and the thickness of the infrared filtering functional layer 4 can be selected to be 1-10 um.
In order to avoid crosstalk between the sensing modules 12 corresponding to the same wavelength of light, it is also necessary to ensure that the distance between adjacent sensing modules 12 corresponding to the same wavelength of light is large enough. Taking a common glass material as a material at the light emitting surface 13 of the fingerprint identification structure as an example, the refractive index of the material is generally 1.5, the corresponding critical incident angle of total reflection is 41.8 °, taking the value of d as 1-2mm as an example, considering the conventional size of the sub-pixels, and considering that one pixel (including the minimum unit of the sub-pixels with different colors) can be spaced between the identification units 1, and also a plurality of pixels can be spaced, and the center distance of the sensing modules 12 of any two identification units 1 emitting light with the same wavelength in engineering can be selected between 40um-2 mm.
Fig. 3 also shows a second substrate 4, and the second substrate 4 is, for example, a cover plate with a touch function or a cover plate without a touch function.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A fingerprint identification structure comprising a plurality of identification cells arranged in an array;
each identification unit comprises an emission module and a sensing module, and the sensing module is arranged at a position capable of receiving light emitted by the emission module and reflected by fingerprints;
in each identification unit, the wavelength of light which can be sensed by the sensing module is the same as the wavelength of light emitted by the emitting module;
the wavelengths of the light emitted by the emitting modules in any two adjacent identification units are different; the wavelengths of the light emitted by the emitting modules of the identification units are periodically distributed in two different directions which are vertical to the normal of the plane where the identification units are located; the identification units are distributed into a plurality of identical identification unit arrays, the identification units with the same number are arranged in the row direction of all the identification unit arrays, the identification units with the same number are arranged in the column direction of all the identification unit arrays, the wavelengths of the light emitted by the emission modules of the identification units at the same positions in any two identification unit arrays are identical, and the wavelengths of the light emitted by the emission modules of any two identification units in each identification unit array are different.
2. The fingerprint identification structure of claim 1, wherein the emitting module comprises a micro-infrared emitting diode and the sensing module comprises a micro-infrared photodiode.
3. The fingerprint identification structure of claim 1, wherein the wavelengths of the light emitted by the emission modules in some of the identification units are the same, and the sensing modules in any two identification units emitting light with the same wavelength are located at positions where the light emitted by the other identification unit and reflected back by the fingerprint cannot be received.
4. The fingerprint identification structure of claim 3, wherein the fingerprint identification structure comprises a light emitting surface, light emitted by the emission modules is emitted to a fingerprint through the light emitting surface, the emission surface of each emission module and the receiving surface of the sensing module are located in the same plane, the distance between the plane and the light emitting surface is d, and the center distances L between the sensing modules in any two identification units emitting light with the same wavelength and the emission module of the opposite side satisfy the following formula: and L is more than 2dtan theta, wherein theta is a critical incident angle when light emitted to the light-emitting surface from the interior of the fingerprint identification structure is totally reflected.
5. A display panel comprising the fingerprint recognition structure according to any one of claims 1 to 4.
6. The display panel according to claim 5, wherein the display panel comprises a first substrate, and the sub-pixels are arranged on one side of the light emitting surface of the first substrate in an array;
the emitting module and the sub-pixel are arranged on the same layer and are arranged in the gap of the adjacent sub-pixel, and/or the sensing module and the sub-pixel are arranged on the same layer and are arranged in the gap of the adjacent sub-pixel.
7. The display panel of claim 6, wherein the sub-pixels comprise micro light emitting diodes that emit visible light.
8. The display panel according to claim 6, wherein a sensor substrate is further disposed on a side of the first substrate facing away from the light exit side, and the sensing module is disposed on the sensor substrate.
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| CN109581747A (en) * | 2019-01-02 | 2019-04-05 | 京东方科技集团股份有限公司 | Light source module group and display module |
| CN111126260B (en) * | 2019-12-23 | 2022-08-16 | 厦门天马微电子有限公司 | Fingerprint identification method of display device, display device and electronic equipment |
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| KR20140050994A (en) * | 2012-10-22 | 2014-04-30 | 삼성디스플레이 주식회사 | Organic light emitting display apparatus and method for manufacturing the same |
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