CN110135405B - Fingerprint identification module, array substrate, manufacturing method of array substrate and liquid crystal display panel - Google Patents
Fingerprint identification module, array substrate, manufacturing method of array substrate and liquid crystal display panel Download PDFInfo
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- CN110135405B CN110135405B CN201910559168.9A CN201910559168A CN110135405B CN 110135405 B CN110135405 B CN 110135405B CN 201910559168 A CN201910559168 A CN 201910559168A CN 110135405 B CN110135405 B CN 110135405B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Abstract
The invention provides a fingerprint identification module for a liquid crystal display panel, an array substrate, a manufacturing method of the array substrate and the liquid crystal display panel. This fingerprint identification module includes: an optical fingerprint recognition sensor; the insulating layer is arranged on the photosensitive surface of the optical fingerprint identification sensor, the insulating layer is in contact with liquid crystal in the liquid crystal display panel, and the refractive index of the insulating layer is larger than the abnormal refractive index of the liquid crystal. When the fingerprint identification module is used in a liquid crystal display panel, light reflected by a finger pressing part can be more incident into the optical fingerprint identification sensor, so that the utilization rate of reflected light is higher when fingerprint identification is carried out, the detection precision of the optical fingerprint identification sensor is higher, and the fingerprint identification function is better realized; meanwhile, the trend of the emitted light in the liquid crystal display panel is changed, so that the light which should be emitted into the black matrix is emitted out of the liquid crystal display panel, the transmittance of the liquid crystal display panel is higher, and the display picture is better.
Description
Technical Field
The invention relates to the technical field of display, in particular to a fingerprint identification module, an array substrate, a manufacturing method of the array substrate and a liquid crystal display panel.
Background
In the related art, the optical fingerprint recognition technology is to realize fingerprint recognition by recognizing a difference in intensity of light reflected into an optical fingerprint recognition sensor through a finger due to a difference in reflectivity of ridges or valleys on a surface of the finger to the light after the light is irradiated to the finger. However, when the backlight module is directly applied to the liquid crystal display panel, most of the light reflected by the finger cannot enter the optical fingerprint sensor because the light transmittance of the backlight module is low, and thus the function of fingerprint identification cannot be well realized.
Therefore, the related art of fingerprint identification in the existing liquid crystal display panel still needs to be improved.
Disclosure of Invention
The present invention has been completed based on the following findings of the inventors:
the inventor of the present invention has made extensive studies on the structure of a liquid crystal display panel when the optical fingerprint sensor is applied to the liquid crystal display panel, and found that the reason why most of light reflected by a finger cannot enter the optical fingerprint sensor when the optical fingerprint sensor is directly applied to the liquid crystal display panel in the related art is that: firstly, backlight unit's light transmissivity is lower, but more important reason lies in because liquid crystal display panel is when using, and the electric field of display area periphery is not controlled, therefore optics fingerprint identification sensor sets up when liquid crystal display panel is inside, sets up the below at black matrix with optics fingerprint identification sensor, and optics fingerprint identification sensor just can not influence the electric field of display area periphery to influence the display frame. Therefore, under the premise that the optical fingerprint recognition sensor is disposed below the black matrix in the liquid crystal display panel, most of the light reflected by the finger cannot enter the optical fingerprint recognition sensor due to the shielding of the black matrix, and thus the function of fingerprint recognition cannot be well realized. In contrast, the inventor skillfully arranges an insulating layer with the refractive index larger than the abnormal refractive index of liquid crystal in a liquid crystal display panel on the surface of the photosensitive surface of the existing optical fingerprint identification sensor to change the trend of a light path in the liquid crystal display panel, so that more light reflected by a finger pressing part can be incident into the optical fingerprint identification sensor, the utilization rate of reflected light is higher when fingerprint identification is carried out, the detection precision of the optical fingerprint identification sensor is higher, and the fingerprint identification function is better realized; on the other hand, the light which should be emitted into the black matrix is made to exit the liquid crystal display panel, so that the transmittance of the liquid crystal display panel is high, and the display picture is good.
Based on this, the present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a fingerprint recognition module for a liquid crystal display panel, which can make more light reflected by a finger pressing portion enter an optical fingerprint recognition sensor when used in the liquid crystal display panel, so that the utilization rate of the reflected light is higher when performing fingerprint recognition, the detection accuracy of the optical fingerprint recognition sensor is higher, the fingerprint recognition function can be better realized, the direction of the light emitted from the liquid crystal display panel can be changed, the light which should be emitted into a black matrix exits the liquid crystal display panel, the transmittance of the liquid crystal display panel is higher, or the display screen is better.
In one aspect of the invention, a fingerprint identification module for a liquid crystal display panel is provided. According to an embodiment of the present invention, the fingerprint recognition module includes: an optical fingerprint recognition sensor; the insulating layer is arranged on the photosensitive surface of the optical fingerprint identification sensor, the insulating layer is in contact with liquid crystal in the liquid crystal display panel, and the refractive index of the insulating layer is larger than the abnormal refractive index of the liquid crystal. Because the refractive index of the insulating layer in the fingerprint identification module is greater than the abnormal refractive index of liquid crystal in the liquid crystal display panel, when the fingerprint identification module is used in the liquid crystal display panel, more light reflected by the pressing part of a finger can be emitted into the optical fingerprint identification sensor, so that the utilization rate of reflected light is higher when fingerprint identification is carried out, the detection precision of the optical fingerprint identification sensor is higher, and the fingerprint identification function is better realized; meanwhile, the trend of the emitted light in the liquid crystal display panel is changed, so that the light which should be emitted into the black matrix is emitted out of the liquid crystal display panel, the transmittance of the liquid crystal display panel is higher, and the display picture is better.
According to an embodiment of the present invention, the insulating layer includes a plurality of sub-insulating layers arranged in a stacked manner, and an equivalent refractive index of the plurality of sub-insulating layers is larger than an extraordinary refractive index of the liquid crystal.
According to an embodiment of the present invention, thicknesses of the plurality of sub insulating layers are substantially the same.
According to the embodiment of the invention, the refractive indexes of the sub-insulating layers are gradually reduced in the direction away from the optical fingerprint identification sensor.
According to an embodiment of the present invention, the insulating layer includes three sub-insulating layers.
According to an embodiment of the invention, the material of the insulating layer comprises silicon nitride.
According to an embodiment of the invention, the thickness of the insulating layer is
In another aspect of the present invention, an array substrate is provided. According to an embodiment of the present invention, the array substrate includes: a substrate; the fingerprint identification module is arranged on the first surface of the substrate; the alignment film is arranged on the first surface which is not covered by the fingerprint identification module. When the array substrate is used in a liquid crystal display panel, the utilization rate of reflected light is high during fingerprint identification, and the detection precision of an optical fingerprint identification sensor in a fingerprint identification module is high, so that the fingerprint identification function is well realized; meanwhile, the liquid crystal display panel has high transmittance and good display picture, and has all the characteristics and advantages of the fingerprint identification module, and redundant description is not repeated.
According to an embodiment of the present invention, a first thin film transistor for driving a display and a second thin film transistor for driving the fingerprint recognition module are disposed on the substrate, a first active layer of the first thin film transistor and a second active layer of the second thin film transistor are made of the same material, and a first gate scan line connected to the first thin film transistor and a second gate scan line connected to the second thin film transistor partially overlap.
In yet another aspect of the present invention, the present invention provides a method of fabricating the array substrate as described above. According to an embodiment of the invention, the method comprises: forming a fingerprint identification module on the first surface of the substrate; forming an alignment film on the first surface which is not covered by the fingerprint identification module so as to obtain the array substrate. The method is simple and convenient to operate, easy to realize and easy for industrial production, and can effectively manufacture the array substrate, when the manufactured array substrate is used in a liquid crystal display panel, the utilization rate of reflected light is high when fingerprint identification is carried out, the detection precision of an optical fingerprint identification sensor in a fingerprint identification module is high, and therefore the fingerprint identification function is well realized; meanwhile, the transmittance of the liquid crystal display panel is high, and the display picture is good.
In still another aspect of the present invention, a liquid crystal display panel is provided. According to an embodiment of the present invention, the liquid crystal display panel includes the array substrate as described above. The liquid crystal display panel has higher utilization rate of reflected light when fingerprint identification is carried out, thereby better realizing the fingerprint identification function; meanwhile, the transmittance is high, and the display picture is good.
Drawings
Fig. 1 is a schematic cross-sectional view illustrating a fingerprint identification module according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view illustrating a fingerprint identification module according to another embodiment of the present invention when the fingerprint identification module is used in a liquid crystal display panel.
Fig. 3 is a schematic cross-sectional view of a fingerprint identification module according to another embodiment of the invention.
Fig. 4 is a schematic cross-sectional view of a fingerprint recognition module according to yet another embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view illustrating an array substrate according to an embodiment of the present invention.
Fig. 6 is a schematic plan view illustrating an array substrate according to an embodiment of the present invention.
Fig. 7 showsbase:Sub>A schematic structure ofbase:Sub>A cross sectionbase:Sub>A-base:Sub>A' of the array substrate in the embodiment of fig. 6.
Fig. 8 is a schematic structural diagram showing a section B-B' of the array substrate in the embodiment of fig. 6.
Fig. 9 is a flowchart illustrating a method for fabricating an array substrate according to an embodiment of the invention.
Reference numerals:
10: fingerprint identification module 20: liquid crystal 30: black matrix 40: substrate 50: alignment film 88: reflected light 99: emergent light 100: the optical fingerprint recognition sensor 110: photosensitive surface 120: protective layer 130: electrode layer 140: first conductivity type region 150: second conductivity type region 160: a PIN junction 170: bottom electrodes 210a, 210b, 210c: the sub-insulating layer 300: substrate 310: first active layer 320: first gate insulating layer 330: first gate scanning line 340: first data line 360: second gate scanning line 370: second gate insulating layer 380: interlayer insulating layer 400: the planarization layer 410: second data line 420: organic material layer 430: the common electrode 440: resin layer 450: organic film layer 500: display area
Detailed Description
The following describes embodiments of the present invention in detail. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are conventional products which are commercially available, and are not indicated by manufacturers.
In one aspect of the invention, a fingerprint identification module for a liquid crystal display panel is provided. According to an embodiment of the present invention, referring to fig. 1 and 2, the fingerprint identification module 10 includes: an optical fingerprint recognition sensor 100; the insulating layer 200 is arranged on the photosensitive surface 110 of the optical fingerprint identification sensor 100, the insulating layer 200 is in contact with the liquid crystal 20 in the liquid crystal display panel, and the refractive index of the insulating layer 200 is greater than the abnormal refractive index of the liquid crystal 20. Because the refractive index of the insulating layer 200 in the fingerprint identification module 10 is greater than the abnormal refractive index of the liquid crystal 20 in the liquid crystal display panel, when the fingerprint identification module is used in the liquid crystal display panel, more reflected light 88 at the finger pressing position can enter the optical fingerprint identification sensor 100 (the schematic light path diagram refers to fig. 1, wherein the dotted arrow shows the original direction of light, that is, the light 88 cannot enter the optical fingerprint identification sensor 100, the solid arrow shows the direction of light after being refracted by the liquid crystal 20 entering the insulating layer 200, and the light which cannot enter the optical fingerprint identification sensor 100 is led to the optical fingerprint identification sensor 100 by arranging the insulating layer 200), so that the utilization rate of the reflected light 88 is higher during fingerprint identification, the detection accuracy of the optical fingerprint identification sensor 100 is higher, and the fingerprint identification function is better realized; meanwhile, the direction of the emergent light 99 in the liquid crystal display panel is changed, so that the light which should be emitted into the black matrix 30 is emitted out of the liquid crystal display panel (a light path schematic diagram refers to fig. 2, wherein a dotted arrow shows the original direction of the light emitted from the liquid crystal display panel, namely, the light 99 is emitted into the black matrix 30, a solid arrow shows the direction of the light which is emitted into the liquid crystal 20 from the insulating layer 200 and is refracted, and the light which cannot be emitted out of the liquid crystal display panel is emitted out of the liquid crystal display panel by arranging the insulating layer 200), so that the transmittance of the liquid crystal display panel is high, and the display picture is good.
In some embodiments of the present invention, referring to fig. 1 and 2, the insulating layer 200 may be a single layer; in other embodiments of the present invention, referring to fig. 3, the insulating layer may include a plurality of sub-insulating layers 210a, 210b, 210c stacked one on another, and an equivalent refractive index of the plurality of sub-insulating layers 210a, 210b, 210c is greater than an extraordinary refractive index of the liquid crystal 20. Therefore, the equivalent refractive indexes of the sub-insulating layers 210a, 210b and 210c are larger than the abnormal refractive index of the liquid crystal 20, so that multiple refractions can occur, the direction change of light rays is large, more light rays can enter the optical fingerprint identification module, the fingerprint identification function can be further realized, and the transmittance of the liquid crystal display panel is higher.
According to the embodiments of the present invention, as long as the equivalent refractive index of the plurality of sub-insulating layers in the insulating layer is made larger than the refractive index of the liquid crystal 20, the aforementioned fingerprint recognition function and the effect of making the transmittance of the liquid crystal display panel high can be well achieved, and in particular, the refractive indexes of the plurality of sub-insulating layers are not particularly limited, and in some embodiments of the present invention, the refractive indexes of the plurality of sub-insulating layers may be gradually reduced in a direction away from the optical fingerprint recognition sensor; in other embodiments of the present invention, the refractive index of the sub-insulating layers may be gradually increased in a direction away from the optical fingerprint identification sensor; in some embodiments, the refractive index of the sub-insulating layers may decrease and then increase or increase and then decrease in a direction away from the optical fingerprint sensor. In some embodiments of the present invention, the refractive index of the plurality of sub-insulating layers is gradually decreased. Therefore, the fingerprint identification function and the effect of enabling the transmittance of the liquid crystal display panel to be high can be well achieved.
According to the embodiment of the invention, further, after the inventor conducts deep investigation and a large number of experimental verifications on the arrangement of the refractive indexes of the sub-insulating layers in the insulating layers, the inventor finds that when the refractive indexes of the sub-insulating layers are gradually reduced in the direction far away from the optical fingerprint identification sensor, refraction occurs at each interface, the angle change of light is large, more light can be made to enter the optical fingerprint identification module, the fingerprint identification function can be better realized, the transmittance of the liquid crystal display panel is better, more light can be made to irradiate the optical fingerprint identification sensor, the light energy utilization rate can be increased by not less than 6.7%, the fingerprint identification function can be better realized, and the transmittance of the liquid crystal display panel is better.
According to the embodiments of the present invention, referring to fig. 3, the case where the insulating layer includes three sub-insulating layers is described as an example, in some embodiments of the present invention, the relationship between the refractive indexes of the three sub-insulating layers may be that the refractive index of the sub-insulating layer 210a is greater than the refractive index of the sub-insulating layer 210b, and the refractive index of the sub-insulating layer 210b is greater than the refractive index of the sub-insulating layer 210 c; in other embodiments of the present invention, the refractive index of the sub-insulating layer 210a may be greater than the refractive index of the sub-insulating layer 210c, and the refractive index of the sub-insulating layer 210c may be greater than the refractive index of the sub-insulating layer 210 b; in still other embodiments of the present invention, the refractive index of the sub-insulating layer 210b may be greater than the refractive index of the sub-insulating layer 210a, and the refractive index of the sub-insulating layer 210a may be greater than the refractive index of the sub-insulating layer 210 c; in still other embodiments of the present invention, the refractive index of the sub-insulating layer 210b may be greater than the refractive index of the sub-insulating layer 210c, and the refractive index of the sub-insulating layer 210c may be greater than the refractive index of the sub-insulating layer 210 a; in addition, the refractive index of the sub-insulating layer 210c may be greater than the refractive index of the sub-insulating layer 210a, and the refractive index of the sub-insulating layer 210a may be greater than the refractive index of the sub-insulating layer 210 b; or the refractive index of the sub-insulating layer 210c is greater than that of the sub-insulating layer 210b, and the refractive index of the sub-insulating layer 210b is greater than that of the sub-insulating layer 210 a. Therefore, different combinations of the refractive index arrangement of the sub-insulation layers can realize the fingerprint identification function and the effect of enabling the transmittance of the liquid crystal display panel to be higher, and the combination of the refractive indexes of the sub-insulation layers is not limited too much, so that the sub-insulation layers are simple and convenient to manufacture and easy to industrialize.
According to the embodiment of the present invention, when the insulating layer includes three sub-insulating layers, when the refractive index of the sub-insulating layer 210a is greater than the refractive index of the sub-insulating layer 210b, and the refractive index of the sub-insulating layer 210b is greater than the refractive index of the sub-insulating layer 210c, the fingerprint identification function can be better achieved, the transmittance of the liquid crystal display panel can be better achieved, more light can be irradiated into the optical fingerprint identification sensor, the light energy utilization rate can be increased by not less than 6.7%, and the fingerprint identification function can be better achieved, and the transmittance of the liquid crystal display panel can be better achieved.
According to the embodiment of the present invention, as described above, as long as the refractive index of the insulating layer is made larger than the refractive index of the liquid crystal, when the insulating layer includes a plurality of sub-insulating layers, as long as the equivalent refractive index of the plurality of sub-insulating layers in the insulating layer is made larger than the refractive index of the liquid crystal 20, the aforementioned function of fingerprint recognition and the effect of making the transmittance of the liquid crystal display panel high can be preferably achieved. On the basis of this, the thickness of the insulating layer is not particularly limited, and the inventors have conducted extensive studies and extensive experimental verification on the thickness of the insulating layer and have found that when the thickness of the insulating layer is set to be
In this case, the fingerprint recognition function can be further realized and the transmittance of the liquid crystal display panel can be increased. In particular, the thickness of the insulating layer may be
Or alternatively
Therefore, the fingerprint identification function can be further realized, the transmittance of the liquid crystal display panel is higher, the process is simple, the thickness of the insulating layer is moderate, the thickness of the liquid crystal display panel cannot be excessively increased, the industrialization is easy to realize, and the development requirement of the lightness and thinness of the display panel is met.
According to the embodiment of the present invention, when the insulating layer includes a plurality of sub-insulating layers, the thicknesses of the plurality of sub-insulating layers may be the same or different, or the thicknesses of some sub-insulating layers of the plurality of sub-insulating layers may be the same, and the thicknesses of other sub-insulating layers are different from the thicknesses of the sub-insulating layers. Furthermore, after the inventor conducts deep investigation and a great deal of experimental verification on the thickness relationship of the plurality of sub-insulating layers, it is found that when the thicknesses of the plurality of sub-insulating layers are substantially the same, the fingerprint identification function can be further realized and the transmittance of the liquid crystal display panel can be further improved.
According to an embodiment of the present invention, when the insulating layer includes a plurality of sub-insulating layers, the number of the plurality of sub-insulating layers may be three. Therefore, compared with the insulating layer comprising other numbers of sub-insulating layers, the light-reflecting structure can better meet the requirement of refracting light, and meanwhile, the number of the sub-insulating layers is not large, and the thickness of the sub-insulating layers is thinner, so that the effect of the fingerprint identification function is better, and the transmittance of the liquid crystal display panel is higher.
According to an embodiment of the present invention, a material forming the insulating layer includes silicon nitride or the like. Therefore, the material source is wide and easy to obtain, and the cost is lower.
According to an embodiment of the present invention, a specific structure of the optical fingerprint recognition sensor is not particularly limited, and it may adopt a structure of an optical fingerprint recognition sensor in the related art, for example, referring to fig. 4, it may include a protective layer 120, an electrode layer 130, a first conductive type region 140, a second conductive type region 150, a PIN junction 160, and a bottom electrode 170, wherein one of the first conductive type region 140 and the second conductive type region 150 is a P-type semiconductor, and the other is an N-type semiconductor. Therefore, the structure is simple, and industrialization is easy to realize.
In another aspect of the present invention, an array substrate is provided. According to an embodiment of the present invention, referring to fig. 5, the array substrate includes: a substrate 40; the fingerprint identification module 10 is arranged in the foregoing, and the fingerprint identification module 10 is arranged on the first surface of the substrate 40; an alignment film 50, wherein the alignment film 50 is disposed on the surface of the substrate 40 not covered by the fingerprint identification module 10. When the array substrate is used in a liquid crystal display panel, the utilization rate of reflected light is high during fingerprint identification, and the detection precision of an optical fingerprint identification sensor in a fingerprint identification module is high, so that the fingerprint identification function is well realized; meanwhile, the liquid crystal display panel has high transmittance and good display image, and has all the characteristics and advantages of the fingerprint identification module, which are not described in detail herein.
According to the embodiment of the present invention, it can be understood by those skilled in the art that the base 40 may include a substrate, a thin film transistor, a metal trace, and the like, which are not described in detail herein.
According to an embodiment of the present invention, further, a first thin film transistor for driving a display and a second thin film transistor for driving the fingerprint identification module are disposed on the substrate 40, and a material of a first active layer in the first thin film transistor is the same as a material of a second active layer in the second thin film transistor, so that a first gate scan line connected to the first thin film transistor and a second gate scan line connected to the second thin film transistor partially overlap. Therefore, the first grid scanning line is partially overlapped with the second grid scanning line, so that the array substrate is provided with the fingerprint identification module, the grid scanning lines are not additionally added, and the liquid crystal display panel comprising the array substrate can have higher aperture opening ratio on the basis of realizing fingerprint identification; in addition, in the array substrate, the second data line connected with the second thin film transistor only needs to be added to the pixel unit with the fingerprint identification module, and too much adverse effect on the aperture opening ratio of the liquid crystal display panel can not be caused, so that the array substrate can enable the liquid crystal display panel to better realize the fingerprint identification function and better display effect.
According to the embodiment of the present invention, specifically, the material of the first active layer and the second active layer may be Low Temperature Polycrystalline Oxide (LTPO), so that the material source is wide and easily available, the cost is low, and the fingerprint identification function and the better display effect can be better achieved.
In an embodiment of the present invention, referring to fig. 6 to 8 (fig. 7 isbase:Sub>A schematic structural view ofbase:Sub>A-base:Sub>A 'section in fig. 6, and fig. 8 isbase:Sub>A schematic structural view ofbase:Sub>A B-B' section), the array substrate includes: the optical fingerprint sensor array substrate includes a substrate 300, a first active layer 310, a first gate insulating layer 320, a first gate scan line 330, a first data line 340, a pixel electrode pad (not shown), a second gate scan line 360, a second gate insulating layer 370, an interlayer insulating layer 380, a second active layer (not shown), an organic film layer 450 (including the planarization layer 400, the resin layer 440, and the protective layer 120 in fig. 7), a second data line 410, a pixel electrode (not shown), a common electrode 430, a display region 500, the optical fingerprint sensor 100, and an alignment film (not shown), and further, the positional relationship between the optical fingerprint sensor and the liquid crystal 20 and the black matrix 30 in the liquid crystal display panel when the array substrate is used in the liquid crystal display panel is shown in fig. 8. It should be noted that, in the array substrate, the positional relationship of each of the above components may be the positional relationship of each of the components in the conventional array substrate, and will not be described in detail herein. The array substrate is simple in structure, easy to implement and suitable for industrialization, when the array substrate is used in a liquid crystal display panel, the utilization rate of reflected light is higher during fingerprint identification, the detection precision of an optical fingerprint identification sensor in a fingerprint identification module is higher, and therefore the fingerprint identification function is better realized; meanwhile, the liquid crystal display panel has higher transmittance and better display picture, and has all the characteristics and advantages of the fingerprint identification module, and redundant description is not repeated.
According to the embodiments of the present invention, it can be understood by those skilled in the art that the substrate 300 may include a glass substrate, a buffer layer, a light shielding layer, etc., and will not be described in detail herein.
In yet another aspect of the present invention, there is provided a method of fabricating the array substrate as described above. According to an embodiment of the present invention, referring to fig. 9, the method comprises the steps of:
s100: a fingerprint recognition module is formed on the first surface of the substrate.
According to an embodiment of the present invention, specifically, the method may include depositing a first active layer, a first gate insulating layer, a first gate scan line, a first data line, a pixel electrode pad, a second gate insulating layer, a second gate scan line, a second data line, an interlayer insulating layer, a second active layer, a pixel electrode, a fingerprint identification module, a planarization layer, and a common electrode on a substrate in the following order, where specific process conditions and parameters of the deposition may be conventional deposition process conditions and parameters, and are not described herein in detail. Therefore, the method is simple and convenient to operate, easy to realize and easy for industrial production.
S200: forming an alignment film on the first surface which is not covered by the fingerprint identification module so as to obtain the array substrate.
According to the embodiment of the present invention, the specific process for forming the alignment film is a conventional process for forming the alignment film, and will not be described herein in detail. Therefore, the operation is simple and convenient, the realization is easy, the industrial production is easy, the array substrate can be effectively manufactured, when the obtained array substrate is used in a liquid crystal display panel, the utilization rate of reflected light is higher when fingerprint identification is carried out, the detection precision of an optical fingerprint identification sensor in a fingerprint identification module is higher, and the fingerprint identification function is better realized; meanwhile, the transmittance of the liquid crystal display panel is high, and the display picture is good.
In still another aspect of the present invention, a liquid crystal display panel is provided. According to an embodiment of the present invention, the liquid crystal display panel includes the array substrate described above. The liquid crystal display panel has high utilization rate of reflected light during fingerprint identification, thereby better realizing the fingerprint identification function; meanwhile, the transmittance is high, and the display picture is good.
According to the embodiments of the present invention, it can be understood by those skilled in the art that, besides the foregoing structure, the liquid crystal display panel also includes the structure and components of a conventional liquid crystal display panel, such as a backlight module, and so on, which are not described in detail herein.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. The utility model provides a fingerprint identification module for liquid crystal display panel which characterized in that includes:
an optical fingerprint recognition sensor;
the insulating layer is arranged on the surface of the photosensitive surface of the optical fingerprint identification sensor, the insulating layer is in contact with liquid crystal in the liquid crystal display panel, and the refractive index of the insulating layer is larger than the abnormal refractive index of the liquid crystal.
2. The fingerprint identification module of claim 1, wherein the insulating layer comprises a plurality of sub-insulating layers stacked one on another, and an equivalent refractive index of the plurality of sub-insulating layers is greater than an extraordinary refractive index of the liquid crystal.
3. The fingerprint identification module of claim 2, wherein the sub-insulating layers are substantially the same thickness.
4. The fingerprint identification module of claim 2, wherein the refractive index of the sub-insulating layers decreases in a direction away from the optical fingerprint identification sensor.
5. The fingerprint identification module of claim 2, wherein the insulating layer comprises three of the sub-insulating layers.
6. The fingerprint identification module of claim 1, wherein the material of the insulating layer comprises silicon nitride.
7. The fingerprint identification module of claim 1, wherein the insulating layer has a thickness of
8. An array substrate, comprising:
a substrate;
the fingerprint identification module of any one of claims 1-7, the fingerprint identification module disposed on a first surface of the substrate;
the alignment film is arranged on the first surface which is not covered by the fingerprint identification module.
9. The array substrate of claim 8, wherein a first thin film transistor for driving a display and a second thin film transistor for driving the fingerprint recognition module are disposed on the substrate, a first active layer of the first thin film transistor and a second active layer of the second thin film transistor are made of the same material, and a first gate scan line connected to the first thin film transistor and a second gate scan line connected to the second thin film transistor are partially overlapped.
10. A method for fabricating the array substrate of claim 8 or 9, comprising:
forming a fingerprint identification module on the first surface of the substrate;
forming an alignment film on the first surface which is not covered by the fingerprint identification module so as to obtain the array substrate.
11. A liquid crystal display panel comprising the array substrate as set forth in claim 8 or 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910559168.9A CN110135405B (en) | 2019-06-26 | 2019-06-26 | Fingerprint identification module, array substrate, manufacturing method of array substrate and liquid crystal display panel |
| PCT/CN2020/092003 WO2020259161A1 (en) | 2019-06-26 | 2020-05-25 | Fingerprint recognition module, array substrate and manufacturing method therefor, and liquid crystal display panel |
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| CN201910559168.9A CN110135405B (en) | 2019-06-26 | 2019-06-26 | Fingerprint identification module, array substrate, manufacturing method of array substrate and liquid crystal display panel |
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| CN110135405B (en) * | 2019-06-26 | 2023-03-10 | 京东方科技集团股份有限公司 | Fingerprint identification module, array substrate, manufacturing method of array substrate and liquid crystal display panel |
| CN112684620B (en) | 2019-10-18 | 2023-01-03 | 上海耕岩智能科技有限公司 | Image acquisition device |
| CN112070066B (en) | 2020-10-09 | 2023-09-29 | 武汉华星光电技术有限公司 | Display device and fingerprint identification method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106647004A (en) * | 2017-01-25 | 2017-05-10 | 京东方科技集团股份有限公司 | Display member and display device containing same |
| CN107608122A (en) * | 2017-10-19 | 2018-01-19 | 广东欧珀移动通信有限公司 | Display screen, functional unit and mobile terminal |
| CN108734134A (en) * | 2018-05-22 | 2018-11-02 | 京东方科技集团股份有限公司 | Fingerprint identification device |
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| CN109447046B (en) * | 2018-12-27 | 2021-07-23 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110135405B (en) * | 2019-06-26 | 2023-03-10 | 京东方科技集团股份有限公司 | Fingerprint identification module, array substrate, manufacturing method of array substrate and liquid crystal display panel |
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| CN106647004A (en) * | 2017-01-25 | 2017-05-10 | 京东方科技集团股份有限公司 | Display member and display device containing same |
| CN107608122A (en) * | 2017-10-19 | 2018-01-19 | 广东欧珀移动通信有限公司 | Display screen, functional unit and mobile terminal |
| CN108734134A (en) * | 2018-05-22 | 2018-11-02 | 京东方科技集团股份有限公司 | Fingerprint identification device |
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