CN110569803A - Grain identification assembly, display device and grain identification method thereof - Google Patents
Grain identification assembly, display device and grain identification method thereof Download PDFInfo
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- CN110569803A CN110569803A CN201910854453.3A CN201910854453A CN110569803A CN 110569803 A CN110569803 A CN 110569803A CN 201910854453 A CN201910854453 A CN 201910854453A CN 110569803 A CN110569803 A CN 110569803A
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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 embodiment of the invention provides a line identification assembly, a display device and a line identification method thereof, relates to the technical field of display, and can obtain a complete line image without time-sharing display, so that the accuracy of line identification is improved. The line identification assembly comprises a substrate, a plurality of line identification units and a filter layer, wherein the line identification units and the filter layer are arranged on the substrate in a stacked mode; the light signal received by the line identification unit can be used for forming a corresponding first line image, and the first line image is provided with an imaging area and a non-imaging area; the non-imaging area of one first texture image is overlapped with the imaging area of at least one other first texture image; the filter layer comprises a plurality of filter units, and the orthographic projection of each filter unit on the substrate is overlapped with the orthographic projection of one line identification unit on the substrate; the filter layer is used for enabling adjacent grain identification units corresponding to the overlapped first grain images to receive light with different wave bands.
Description
Technical Field
The invention relates to the technical field of display, in particular to a line identification assembly, a display device and a line identification method thereof.
Background
Currently, a fingerprint recognition function becomes an indispensable part of a mobile phone. Among them, underscreen fingerprint identification is the hot of current research.
The principle of fingerprint identification under the screen is as follows: display light emitted from the display panel is reflected by a finger and then irradiates the optical sensor, the optical sensor converts an optical signal into an electric signal, and a fingerprint image is obtained according to the electric signal. Because the self-fingerprint of the finger comprises the valleys and the ridges, the light intensity reflected by the valleys and the ridges is different, and further, the electrical signals converted by the optical sensor are different, so that the fingerprint identification is carried out.
however, since most of the light emitted from the sub-pixels is small-angle light, and the valley of the finger and the display device cannot be in direct contact, there is air between the two. Therefore, the small-angle light reflected by the valleys of the finger is totally reflected when entering the display device from the air, resulting in the existence of the non-imaging region of the grain image as shown in fig. 1.
In the prior art, as shown in fig. 2, in order to obtain a complete fingerprint image, a display device may be time-divisionally lighted, and a non-imaging area of an optical sensor is filled to implement complementary imaging. However, the time-sharing illumination can prolong the exposure integration time, and the light reflected by the finger has an afterimage on the optical sensor, which causes the light received by the optical sensor to be inaccurate, thereby affecting the accuracy of fingerprint identification.
disclosure of Invention
The embodiment of the invention provides a line identification assembly, a display device and a line identification method thereof, which can obtain a complete line image without time-sharing display and improve the accuracy of line identification.
in order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
In a first aspect, a texture recognition assembly is provided, which includes a substrate, a plurality of texture recognition units and a filter layer stacked on the substrate; the light signal received by the line identification unit can be used for forming a corresponding first line image, and the first line image is provided with an imaging area and a non-imaging area; the non-imaging region of one of the first texture images overlaps the imaging region of at least one other first texture image; the filter layer comprises a plurality of filter units, and the orthographic projection of each filter unit on the substrate is overlapped with the orthographic projection of one line identification unit on the substrate; the filter layer is used for enabling the adjacent line identification units corresponding to the overlapped first line images to receive light with different wave bands.
Optionally, two of the first texture images corresponding to two adjacent texture recognition units have an overlapping region, where the overlapping region includes the non-imaging region of the two first texture images.
In a second aspect, a display device is provided, which includes a display panel and the grain identification assembly of the first aspect; the line identification assembly is arranged on one side of the display surface deviating from the display panel.
Optionally, the display device has a display area, and the display area includes a light emitting area and a light transmitting area; the line recognition unit is located in the light-transmitting area.
In a third aspect, a display device is provided, which includes a light emitting device, a plurality of grain recognition units, and a filter layer; the filter layer is arranged on one side, close to the display surface of the display device, of the line identification unit; the light signal received by the line identification unit can be used for forming a corresponding first line image, and the first line image is provided with an imaging area and a non-imaging area; the non-imaging region of one of the first texture images overlaps the imaging region of at least one other first texture image; the filter layer comprises a plurality of filter units, and the orthographic projection of each filter unit on a display surface is overlapped with the orthographic projection of one line identification unit on the display surface; the filter layer is used for enabling the adjacent line identification units corresponding to the overlapped first line images to receive light with different wave bands.
Optionally, two of the first texture images corresponding to two adjacent texture recognition units have an overlapping region, where the overlapping region includes the non-imaging region of the two first texture images.
Optionally, the filter layer is disposed on one side of the light emitting device close to the display surface; the light filtering unit and the line identification unit are in one-to-one correspondence with the light emitting devices, and the orthographic projection of the light filtering unit on the display surface is overlapped with the orthographic projection of the corresponding light emitting device on the display surface; every three adjacent filtering units form a filtering group, and the three filtering units in the filtering group are respectively used for enabling three primary colors to pass through.
Optionally, the light emitted by the light emitting device is white light.
Optionally, the display device has a display area, and the display area includes a light emitting area and a light transmitting area; the line recognition unit is located in the light-transmitting area.
Optionally, the light emitting device and the grain identification unit are arranged on the same layer.
Optionally, the colors of the light emitted by the light emitting device are three primary colors; the filter layer is arranged between the light-emitting device and the line identification unit.
Optionally, the display device has a display area, and the display area includes a light emitting area and a light transmitting area; the line identification unit is arranged in the light-transmitting area.
In a fourth aspect, there is provided a texture recognition method of a display device according to the second or third aspect, the texture recognition method comprising a detection stage; the detection phase comprises: acquiring a first electric signal converted from an optical signal on the line identification unit in each frame; according to the response rate of the line identification unit to the light received by the line identification unit, carrying out normalization processing on the first electric signal to obtain a second electric signal; and splicing a second grain image according to the second electric signal.
optionally, before the detection stage, the texture recognition method further includes a calibration stage; the calibration phase comprises: repeating the steps for multiple times to enable the grain identification unit to receive light of different wave bands; and obtaining the response rate of the texture recognition unit to light of different wave bands according to a third electric signal converted by the texture recognition unit to the light received by the texture recognition unit.
The embodiment of the invention provides a line identification assembly, a display device and a line identification method thereof, wherein the line identification assembly comprises a line identification unit, a light signal received by the line identification unit can form a corresponding first line image, and a non-imaging area of one first line image is overlapped with an imaging area of at least one other first line image, so that the non-imaging area of the first line image can be filled. On the basis, in order to avoid influencing the accuracy of grain identification due to the overlapping of the imaging areas of a plurality of first grain images, the grain identification assembly also comprises a filter layer which is arranged in a laminating way with the grain identification unit, the filter layer is used for enabling the adjacent grain identification units corresponding to the overlapped first grain images to receive light with different wave bands, after the light signals received by the grain identification unit are converted into first electric signals, the light signals can be received according to the response rate of the grain identification unit to the light received by the grain identification unit, normalizing the first electrical signal to obtain a second electrical signal, splicing a second grain image filled in the non-imaging area according to the second electrical signal to obtain a more complete second grain image, because the wave bands of the light received by the grain identification unit corresponding to the overlapped first grain image are different, therefore, when the line identification assembly is applied to the display device, the accuracy of line identification can be improved without time-sharing display.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a region distribution diagram of a texture image provided by the prior art;
Fig. 2 is a schematic structural diagram of a texture recognition assembly according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of a texture recognition assembly according to an embodiment of the present invention;
Fig. 4 is a distribution diagram of a region of a first texture image according to an embodiment of the present invention;
Fig. 5a is a schematic structural diagram of a display device according to an embodiment of the present invention;
Fig. 5b is a schematic structural diagram of a display device according to an embodiment of the present invention;
Fig. 6a is a schematic structural diagram of a display device according to an embodiment of the present invention;
Fig. 6b is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention;
Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention;
Fig. 9 is a flowchart of a texture detection method according to an embodiment of the present invention;
fig. 10 is a flowchart of a calibration phase according to an embodiment of the present invention.
Reference numerals:
10-a substrate; 11-a grain identification unit; 12-a light filtering unit; 21-a light emitting device; 211-a first electrode; 212-a light emitting functional layer; 213-a second electrode; 22-thin film transistor; 31-adhesive layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a grain recognition assembly, as shown in fig. 2 and 3, including a substrate 10, a plurality of grain recognition units 11 stacked on the substrate 10, and a filter layer; the light signal received by the grain identification unit 11 can be used for forming a corresponding first grain image, and the first grain image is provided with an imaging area and a non-imaging area; as shown in fig. 4, the non-imaging region of one first texture image overlaps with the imaging region of at least one other first texture image; the filter layer comprises a plurality of filter units 12, wherein the orthographic projection of each filter unit 12 on the substrate 10 is overlapped with the orthographic projection of one line identification unit 11 on the substrate 10; the filter layer is used to make the adjacent grain identification units 11 corresponding to the overlapped first grain images receive light of different wave bands.
here, it should be understood by those skilled in the art that the plurality of grain recognition units 11 are arranged on a surface perpendicular to the thickness of the substrate 10, and orthographic projections of the plurality of grain recognition units 11 on the substrate 10 are not overlapped. The area of the first grain image formed according to the light signal received by the grain identification unit 11 may be larger than the area of the grain identification unit 11. Therefore, even if the orthographic projections of the adjacent grain identification units 11 on the substrate 10 do not overlap, the first grain images formed according to the light signals received by the adjacent grain identification units 11 may overlap with each other, and may also not overlap, specifically, depending on the distance between the adjacent grain identification units 11.
The embodiment of the invention can reasonably design the distance between the adjacent grain identification units 11, so that the non-imaging area of one first grain image is overlapped with the imaging area of at least one other first grain image.
in some embodiments, the specific structure of the grain recognition unit 11 is not limited as long as the grain recognition unit 11 can convert the optical signal into the electrical signal.
For example, the grain recognition unit 11 may be a photosensor, or the like.
In some embodiments, the texture recognition component may further include texture recognition circuitry. The line recognition unit 11 receives the optical signal and converts the optical signal into an electrical signal, and the line recognition circuit can obtain a first line image according to the electrical signal.
In some embodiments, the colors of the light received by the adjacent grain recognition units 11 corresponding to the overlapped first grain image may be the same or different.
For example, if the light receiving bands of two adjacent grain identification units 11 corresponding to two overlapped first grain images are 630 to 700nm and 701 to 750nm, the light receiving bands of the two grain identification units 11 are different and have the same color.
or, if the wave bands of light received by two adjacent grain identification units 11 corresponding to two overlapped first grain images are 630-700 nm and 500-560 nm, the wave bands and colors of light received by the two grain identification units 11 are different.
In some embodiments, the filter layer is used to make the adjacent grain recognition units 11 corresponding to the overlapped first grain images receive light of different wavelength bands, and the filter layer includes a plurality of filter units 12.
Based on this, as shown in fig. 2, the filtering units 12 may correspond to and overlap the texture recognition units 11 one to one, and the filtering units 12 corresponding to the texture recognition units 11 receiving light of different wavelength bands may allow light of different wavelength bands to pass through; alternatively, as shown in fig. 3, a part of the grain recognition units 11 corresponds to the filter units 12 one-to-one, and the other part of the grain recognition units 11 does not have filter units 12 corresponding thereto, so that the part of the grain recognition units 11 can receive white light.
In some embodiments, as shown in fig. 3, the texture recognition unit 11 may be disposed on a side of the filter layer close to the substrate 10; alternatively, the texture recognition unit 11 may be disposed on a side of the filter layer facing away from the substrate 10.
Here, the texture recognition unit 11 and the filter layer are disposed at positions relative to the substrate 10, based on the incident direction of light incident on the texture recognition unit 11, to ensure that light first passes through the filter layer and then irradiates the texture recognition unit 11.
In some embodiments, the non-imaging region of one first texture image may be completely covered by the imaging regions of other first texture images, or may be partially covered by the imaging regions of other first texture images.
The embodiment of the invention provides a line identification assembly, which comprises a line identification unit 11, wherein a light signal received by the line identification unit 11 can form a corresponding first line image, and a non-imaging area of one first line image is overlapped with an imaging area of at least one other first line image, so that the non-imaging area of the first line image can be filled. On the basis, in order to avoid influencing the accuracy of texture recognition due to the overlapping of the imaging areas of a plurality of first texture images, the texture recognition component further comprises a filter layer which is arranged in a stacking manner with the texture recognition unit 11, the filter layer is used for enabling the adjacent texture recognition units 11 corresponding to the overlapped first texture images to receive light with different wave bands, after the light signals received by the texture recognition unit 11 are converted into first electric signals, the first electric signals can be normalized according to the response rate of the texture recognition unit 11 to the light received by the texture recognition unit to obtain second electric signals, then the second texture images filled in the non-imaging area are spliced according to the second electric signals, so that more complete second texture images are obtained, because the light wave bands received by the texture recognition unit 11 corresponding to the overlapped first texture images are different, when the texture recognition component is applied to a display device, the accuracy of the line identification can be improved without time-sharing display.
Here, the response rate includes: the efficiency of the grain recognition unit 11 converting the optical signal received by it into the first electrical signal.
Optionally, as shown in fig. 4, two first texture images corresponding to two adjacent texture recognition units 11 have an overlapping region, and the overlapping region includes non-imaging regions of the two first texture images.
in the embodiment of the present invention, since the overlapping region of the two first texture images corresponding to the two adjacent texture recognition units 11 includes the non-imaging region of the two first texture images, the filter layer is only used to enable the multiple texture recognition units 11 to receive light of two different wave bands. Compared with the filter layer for enabling the plurality of grain identification units 11 to receive light with more than two different wave bands, the embodiment of the invention can simplify the preparation process of the filter layer.
An embodiment of the present invention further provides a display device, as shown in fig. 5a and 5b, including a display panel and the grain identification assembly according to any one of the foregoing embodiments; the line identification assembly is arranged on one side of the display surface deviating from the display panel.
In some embodiments, the display panel includes a light emitting device 21 and a pixel circuit for driving the light emitting device 21 to emit light.
The light-emitting device 21 includes a first electrode 211, a light-emitting functional layer 212, and a second electrode 213, which are stacked in this order. The first electrode 211 is an anode, and the second electrode 213 is a cathode; alternatively, the first electrode 211 is a cathode and the second electrode 213 is an anode.
The pixel circuit includes at least the thin film transistor 22 and a capacitor. The thin film transistor 22 may be a bottom gate type thin film transistor, a top gate type thin film transistor, a double gate type thin film transistor, or the like. The thin film transistor 22 includes a gate electrode, a gate insulating layer, an active layer, a source electrode, and a drain electrode.
Here, fig. 5a and 5b show only the driving transistor in the pixel circuit.
In some embodiments, the display panel may be, for example, an Organic Light-Emitting Diode (OLED) display panel, a Quantum Dot Light Emitting diodes (QLED) display panel, or the like.
here, if the display panel is an OLED display panel, the light emitting function layer 212 is an organic light emitting function layer; if the display panel is a QLED display panel, the light emitting functional layer 212 is a quantum dot light emitting functional layer.
In some embodiments, as shown in fig. 5a, the light emitting device 21 may be a top-emitting; as shown in fig. 5b, the light emitting device 21 may also be bottom emitting.
In some embodiments, the principle of texture recognition of the display device is as follows: the light emitting device 21 emits display light, and a part of the display light is emitted by a finger and then irradiated onto the grain recognition unit 11 through the display panel and the filter layer.
In some embodiments, the display device includes a display area, and the texture recognition component may be located in the entire display area or in a portion of the display area.
optionally, the texture recognition assembly is located in a part of the display area, so that when texture recognition is performed, the picture can be normally displayed in the area where the texture recognition assembly is not arranged.
In some embodiments, the texture recognition component may be fixedly bonded to the display panel by the bonding layer 31.
Illustratively, the material of the adhesive layer 31 may be an optically clear adhesive.
An embodiment of the present invention provides a display device, including a display panel and the texture recognition assembly according to any one of the embodiments. The line identification component comprises a line identification unit 11, a corresponding first line image can be formed by a light signal received by the line identification unit 11, and a non-imaging area of one first line image is overlapped with an imaging area of at least one other first line image, so that the non-imaging area of the first line image can be filled. On this basis, in order to avoid the influence on the accuracy of the grain identification due to the overlapping of the imaging areas of the plurality of first grain images, the grain identification assembly further comprises a filter layer which is laminated with the grain identification unit 11 and is used for enabling the adjacent grain identification unit 11 corresponding to the overlapped first grain image to receive light with different wave bands, after the light signal received by the grain identification unit 11 is converted into the first electric signal, according to the response rate of the grain identification unit 11 to the light received by the grain identification unit, normalizing the first electrical signal to obtain a second electrical signal, splicing a second grain image filled in the non-imaging area according to the second electrical signal to obtain a more complete second grain image, because the wave bands of the light received by the grain identification unit 11 corresponding to the overlapped first grain images are different, the display device can improve the accuracy of the grain identification without time-sharing display.
Alternatively, as shown in fig. 5a and 5b, the display device has a display region including a light emitting region and a light transmitting region; the grain identification unit 11 is located in the light-transmitting area.
in some embodiments, the filtering unit 12 may be located only in the light-transmitting region; alternatively, the filter unit 12 may be located in the light-transmitting region and the light-emitting region.
In some embodiments, the thin film transistor 22 is located in the light-transmitting region, and the gate, the source, and the drain of the thin film transistor 22 are all made of conductive materials. The conductive material may be a metal or a transparent oxide.
in the case where the conductive material is metal, since the metal blocks light, light reflected by a finger cannot be irradiated onto the texture recognition unit 11, and therefore, the orthographic projections of the texture recognition unit 11 and the filter unit 12 on the display panel may not overlap with the thin film transistor 22.
For the light emitting device 21 emitting light on one side, part of the display light emitted from the light emitting device 21 may be transmitted to the grain recognition unit 11 from the side opposite to the light emitting side, affecting the accuracy of the grain recognition unit 11.
Therefore, the orthographic projection of the line identification unit 11 on the display panel is positioned in the light transmission area, so that the problem that the accuracy of line identification is influenced because display light emitted from the light emitting device 21 is directly transmitted to the line identification unit 11 without being reflected by fingers can be avoided.
an embodiment of the present invention further provides a display apparatus, as shown in fig. 6a and 6b, including a light emitting device 21, a plurality of texture recognition units 11, and a filter layer; the filter layer is arranged on one side of the line identification unit 11 close to the display surface of the display device; the light signal received by the grain identification unit 11 can be used for forming a corresponding first grain image, and the first grain image is provided with an imaging area and a non-imaging area; the non-imaging area of one first texture image is overlapped with the imaging area of at least one other first texture image; the filter layer comprises a plurality of filter units 12, and the orthographic projection of each filter unit 12 on the display surface is overlapped with the orthographic projection of one line identification unit 11 on the display surface; the filter layer is used to make the adjacent grain identification units 11 corresponding to the overlapped first grain images receive light of different wave bands.
Here, it should be known to those skilled in the art that the plurality of grain recognition units 11 are arranged on a surface perpendicular to the thickness of the display device, and orthographic projections of the plurality of grain recognition units 11 on the filter layer do not overlap. The area of the first grain image formed according to the light signal received by the grain identification unit 11 may be larger than the area of the grain identification unit 11. Therefore, even if the orthographic projections of the adjacent grain identification units 11 on the filter layer are not overlapped, the first grain images formed according to the light signals received by the adjacent grain identification units 11 may be overlapped or not overlapped, and the overlapping may be related to the distance between the adjacent grain identification units 11.
The embodiment of the invention can reasonably design the distance between the adjacent grain identification units 11, so that the non-imaging area of one first grain image is overlapped with the imaging area of at least one other first grain image.
In some embodiments, the specific structure of the grain recognition unit 11 is not limited as long as the grain recognition unit 11 can convert the optical signal into the electrical signal.
For example, the grain recognition unit 11 may be a photosensor, or the like.
In some embodiments, the display device may further include a texture recognition circuit. The line recognition unit 11 receives the optical signal and converts the optical signal into an electrical signal, and the line recognition circuit can obtain a first line image according to the electrical signal.
In some embodiments, the colors of the light received by the adjacent grain recognition units 11 corresponding to the overlapped first grain image may be the same or different.
For example, if the light receiving bands of two adjacent grain identification units 11 corresponding to two overlapped first grain images are 630 to 700nm and 701 to 750nm, the light receiving bands of the two grain identification units 11 are different and have the same color.
or, if the wave bands of light received by two adjacent grain identification units 11 corresponding to two overlapped first grain images are 630-700 nm and 500-560 nm, the wave bands and colors of light received by the two grain identification units 11 are different.
In some embodiments, the filter layer is used to make the adjacent grain recognition units 11 corresponding to the overlapped first grain images receive light of different wavelength bands, and the filter layer includes a plurality of filter units 12.
Based on this, referring to fig. 2, the filtering units 12 may correspond to and overlap the texture recognition units 11 one to one, and the filtering units 12 corresponding to the texture recognition units 11 receiving light of different wavelength bands may allow light of different wavelength bands to pass through; alternatively, referring to fig. 3, a part of the grain recognition units 11 corresponds to the filter units 12 one to one, and the other part of the grain recognition units 11 does not have filter units 12 corresponding thereto, so that the part of the grain recognition units 11 can receive white light.
In some embodiments, the light emitting device 21, whether it is top-emitting or bottom-emitting, is disposed on the side of the texture recognition unit 11 close to the display surface of the display device, so as to ensure that the light reflected by the finger first passes through the filter layer and then irradiates the texture recognition unit 11.
here, depending on the actual design, the filter layer may be disposed on the side of the light emitting device 21 close to the display surface; alternatively, a filter layer may be provided between the light emitting device 21 and the grain recognition unit 11.
In some embodiments, the non-imaging region of one first texture image may be completely covered by the imaging regions of other first texture images, or may be partially covered by the imaging regions of other first texture images.
In some embodiments, the display apparatus further includes a pixel circuit for driving the light emitting device 21 to emit light.
The light-emitting device 21 includes a first electrode 211, a light-emitting functional layer 212, and a second electrode 213, which are stacked in this order. The first electrode 211 is an anode, and the second electrode 213 is a cathode; alternatively, the first electrode 211 is a cathode and the second electrode 213 is an anode.
The pixel circuit includes at least the thin film transistor 22 and a capacitor. The thin film transistor 22 may be a bottom gate type thin film transistor, a top gate type thin film transistor, a double gate type thin film transistor, or the like. The thin film transistor 22 includes a gate electrode, a gate insulating layer, an active layer, a source electrode, and a drain electrode.
Here, fig. 6a and 6b show only the driving transistor in the pixel circuit.
in some embodiments, the display device may be, for example, an OLED display device, or a QLED display device, or the like.
here, if the display device is an OLED display device, the light emitting function layer 212 is an organic light emitting function layer; if the display device is a QLED display device, the light emission functional layer 212 is a quantum dot light emission functional layer.
In some embodiments, as shown in fig. 6a, the light emitting device 21 may be a top-emitting; alternatively, as shown in fig. 6b, the light emitting device 21 may be bottom emitting.
In some embodiments, the principle of texture recognition of the display device is as follows: the light emitting device 21 emits display light, and a part of the display light is reflected by a finger and then irradiated onto the grain recognition unit 11 through the light emitting device 21 and the filter layer.
In some embodiments, the texture recognition component may be located in the entire display area or in a portion of the display area.
Optionally, the texture recognition assembly is located in a part of the display area, so that when texture recognition is performed, the picture can be normally displayed in the area where the texture recognition assembly is not arranged.
The embodiment of the invention provides a display device, which comprises a line identification unit 11, wherein a light signal received by the line identification unit 11 can form a corresponding first line image, and a non-imaging area of one first line image is overlapped with an imaging area of at least one other first line image, so that the non-imaging area of the first line image can be filled by using the imaging areas of the other first line images. On the basis, in order to avoid influencing the accuracy of the texture recognition component due to the overlapping of the imaging areas of the plurality of first texture images, the display device further comprises a filter layer arranged on one side of the texture recognition unit 11 close to the display surface, the filter layer is used for enabling the adjacent texture recognition units 11 corresponding to the overlapped first texture images to receive light with different wave bands, after the light signals received by the texture recognition unit 11 are converted into first electric signals, normalization processing can be carried out on the first electric signals according to the response rate of the texture recognition units 11 to the light received by the texture recognition units to obtain second electric signals, then the second texture images filled in the non-imaging areas are spliced according to the second electric signals, and as the wave bands of the light received by the texture recognition units 11 corresponding to the overlapped first texture images are different, the display device can obtain the complete second texture images without time-sharing display, the accuracy of line identification is improved.
Optionally, as shown in fig. 4, two first texture images corresponding to two adjacent texture recognition units 11 have an overlapping region, and the overlapping region includes non-imaging regions of the two first texture images.
In the embodiment of the present invention, since the overlapping region of the two first texture images corresponding to the two adjacent texture recognition units 11 includes the non-imaging region of the two first texture images, the filter layer is only used to enable the multiple texture recognition units 11 to receive light of two different wave bands. Compared with the filter layer for enabling the plurality of grain identification units 11 to receive light with more than two different wave bands, the embodiment of the invention can simplify the preparation process of the filter layer.
Alternatively, as shown in fig. 7, the filter layer is disposed on one side of the light emitting device 21 close to the display surface; the light filtering unit 12 and the grain identification unit 11 are respectively in one-to-one correspondence with the light emitting devices 21, and the orthographic projection of the light filtering unit 12 on the display surface is overlapped with the orthographic projection of the corresponding light emitting device 21 on the display surface; every adjacent three filter units 12 form a filter group, and the three filter units 12 in the filter group are respectively used for passing three primary colors. Here, fig. 7 shows only a case where the light emitting device 21 is top emission.
In some embodiments, the three primary colors may be red, green, blue with respect to each other; alternatively, the three primary colors may be cyan, yellow, and magenta for each other.
In some embodiments, the light emitted by the light emitting device 21 may be white light; alternatively, the colors of the light emitted by the plurality of light emitting devices 21 may be three primary colors each other.
in the case where the colors of the light emitted from the plurality of light emitting devices 21 are three primary colors, the color of the light allowed to pass through each filter unit 12 is the same as the color of the display light emitted from the corresponding light emitting device 21.
In the embodiment of the present invention, the filter layer is disposed on one side of the light emitting device 21 close to the display surface, and the three filter units 12 in the filter group are respectively used for allowing the three primary colors to pass through, so that if the light emitted by the light emitting device 21 is white light, the filter layer can also be used for filtering the white light, so that the display device displays a color picture; if the colors of the light emitted by the light emitting device 21 are three primary colors, the filter layer filters the light emitted by the light emitting device 21, which is three primary colors, so as to improve the display effect of the display device.
Alternatively, as shown in fig. 6a and 6b, the display device has a display region including a light emitting region and a light transmitting region; the grain identification unit 11 is located in the light-transmitting area.
in some embodiments, since the orthographic projections of the filtering units 12 and the corresponding light emitting devices 21 on the display surface are overlapped, and the orthographic projection of each filtering unit 12 on the display surface is overlapped with the orthographic projection of one texture identifying unit 11 on the display surface, the filtering units 12 are located in both the light emitting region and the light transmitting region.
In some embodiments, the thin film transistor 22 is located in the light-transmitting region, and the gate, the source, and the drain of the thin film transistor 22 are all made of conductive materials. The conductive material may be a metal or a transparent oxide.
In the case where the conductive material is metal, since the metal blocks light, light reflected by a finger cannot be irradiated onto the texture recognition unit 11, and therefore, the orthographic projections of the texture recognition unit 11 and the filter unit 12 on the display panel may not overlap with the thin film transistor 22.
For the light emitting device 21 emitting light on one side, part of the display light emitted from the light emitting device 21 may be transmitted to the grain recognition unit 11 from the side opposite to the light emitting side, affecting the accuracy of the grain recognition unit 11.
Therefore, the orthographic projection of the line identification unit 11 on the display panel is positioned in the light transmission area, so that the problem that the accuracy of line identification is influenced because display light emitted from the light emitting device 21 is directly transmitted to the line identification unit 11 without being reflected by fingers can be avoided.
Alternatively, as shown in fig. 8, the light emitting device 21 and the grain recognition unit 11 are provided in the same layer. Here, fig. 8 shows only a case where the light emitting device 21 is top emission.
In some embodiments, since the filtering units 12 and the texture identifying units 11 are in one-to-one correspondence with the light emitting devices 21, and an orthogonal projection of each filtering unit 12 on the display surface overlaps an orthogonal projection of one texture identifying unit 11 on the display surface, an orthogonal projection of a filtering unit 12 on the display surface overlaps an orthogonal projection of its corresponding light emitting device 21 on the display surface. Therefore, when the light emitting devices 21 are disposed on the same layer as the grain recognition unit 11, each of the filter units 12 corresponds to one grain recognition unit 11 and one light emitting device 21, respectively.
In some embodiments, a high temperature process is required to prepare the texture recognition unit 11, so as to prevent the light-emitting functional layer 212 from being denatured by high temperature and losing the light-emitting function. Optionally, in the embodiment of the present invention, the texture recognition unit 11 may be formed first; after that, the light emitting device 21 is formed again.
In the embodiment of the present invention, the texture recognition unit 11 and the light emitting device 21 are disposed on the same layer, on one hand, the texture recognition unit 11 and the light emitting device 21 may share one filtering unit 12; on the other hand, the thickness of the display device can be reduced, which is beneficial to the thin design of the display device.
Alternatively, as shown in fig. 6a and 6b, the colors of the light emitted by the light emitting device 21 are three primary colors; the filter layer is disposed between the light emitting device 21 and the grain recognition unit 11.
In the embodiment of the present invention, in a case where the colors of the light emitted by the light emitting device 21 are three primary colors, the filter layer may be further disposed between the light emitting device 21 and the grain recognition unit 11, and is only used for filtering the light reflected by the finger and irradiated onto the grain recognition unit 11.
Alternatively, as shown in fig. 6a and 6b, the display device has a display region including a light emitting region and a light transmitting region; the grain identification unit 11 is disposed in the light-transmitting area.
In some embodiments, the filtering unit 12 may be located only in the light-transmitting region; alternatively, the filter unit 12 may be located in the light-transmitting region and the light-emitting region.
In some embodiments, the thin film transistor 22 is located in the light-transmitting region, and the gate, the source, and the drain of the thin film transistor 22 are all made of conductive materials. The conductive material may be a metal or a transparent oxide.
In the case where the conductive material is metal, since the metal blocks light, light reflected by a finger cannot be irradiated onto the texture recognition unit 11, and therefore, the orthographic projections of the texture recognition unit 11 and the filter unit 12 on the display panel may not overlap with the thin film transistor 22.
For the light emitting device 21 emitting light on one side, part of the display light emitted from the light emitting device 21 may be transmitted to the grain recognition unit 11 from the side opposite to the light emitting side, affecting the accuracy of the grain recognition unit 11.
Therefore, the orthographic projection of the line identification unit 11 on the display panel is positioned in the light transmission area, so that the problem that the accuracy of line identification is influenced because display light emitted from the light emitting device 21 is directly transmitted to the line identification unit 11 without being reflected by fingers can be avoided.
An embodiment of the present invention further provides a texture recognition method for a display device as described in any of the foregoing embodiments, where the texture recognition method includes a detection stage.
As shown in fig. 9, the detection phase includes:
s11, obtaining the first electrical signal converted from the optical signal on the texture recognition unit 11 in each frame.
here, light emitted from the light emitting device 21 is reflected by a finger and then irradiated onto the grain recognition unit 11 through the filter layer, and the grain recognition unit 11 converts the optical signal into a first electrical signal.
And S12, normalizing the first electric signal according to the response rate of the texture recognition unit 11 to the light received by the texture recognition unit to obtain a second electric signal.
in some implementations, the way of acquiring the responsivity of the texture recognition unit 11 to light of different wavelength bands is not limited.
And S13, splicing a second grain image according to the second electric signal.
here, the first texture image includes a non-imaging area and an imaging area, the second texture image with complete fingerprint information is obtained by splicing at least two imaging areas of the first texture image, the wavelength bands of light received by the texture recognition unit 11 corresponding to at least two first texture images used for splicing the second texture image are different, and the response rates of the texture recognition unit 11 to light of different wavelength bands are different. Based on this, normalization processing needs to be performed on the first electric signal.
Here, the process of performing normalization processing on the first electrical signal may be: after the grain identification unit 11 converts the received optical signal into a first electrical signal, the processor separates the first electrical signal converted by the grain identification unit 11 corresponding to at least two first grain images for splicing the second grain image; and carrying out normalization processing on the separated first electric signals.
If the imaging areas of at least two first grain images for splicing the second grain image are overlapped, only the first electric signal converted by one of the grain identification units 11 is used.
As an example, assuming that a second texture image is obtained by splicing two first texture images, light received by the texture recognition unit 11 corresponding to the two first texture images is blue light and green light, respectively, and the response rate of the texture recognition unit 11 to the blue light is 10% and the response rate to the green light is 20%, the normalization processing on the separated first signal includes: the first electrical signal converted for blue light is divided by 10% and the first electrical signal converted for green light is divided by 20%.
The embodiment of the invention provides a line identification method of a display device, which has the same technical effect as the display device and is not repeated herein.
Optionally, before the detection stage, the texture recognition method further includes a calibration stage.
As shown in fig. 10, the calibration phase includes:
S21, repeating the steps for a plurality of times to make the grain recognition unit 11 receive light of different wave bands.
Here, the gray scales of the light of different wavelength bands received by the grain recognition unit 11 may be the same.
for example, the vein recognition unit 11 may receive blue light of 255 gray scales in the first frame, and at this time, may only make the light emitting device 21 emitting blue light emit light; the grain identifying unit 11 receives green light of 255 gradations in the second frame, and at this time, may cause only the light emitting device 21 emitting green light to emit light.
And S22, obtaining the response rate of the texture recognition unit 11 to the light of different wave bands according to the third electric signal converted by the texture recognition unit 11 to the light received by the texture recognition unit.
Here, the responsivity of the grain recognition unit 11 to light of different wavelength bands may be calculated by the processor.
In some embodiments, the response rates of the texture recognition unit 11 obtained in the calibration stage to light of different wavebands may be stored in the memory of the display device in advance, and may be directly invoked in the detection stage; alternatively, before each detection stage, the responsivity of the texture recognition unit 11 to light of different wavelength bands may be obtained.
the above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (14)
1. The line identification assembly is characterized by comprising a substrate, a plurality of line identification units and a filter layer, wherein the line identification units and the filter layer are arranged on the substrate in a laminated mode;
The light signal received by the line identification unit can be used for forming a corresponding first line image, and the first line image is provided with an imaging area and a non-imaging area; the non-imaging region of one of the first texture images overlaps the imaging region of at least one other first texture image;
The filter layer comprises a plurality of filter units, and the orthographic projection of each filter unit on the substrate is overlapped with the orthographic projection of one line identification unit on the substrate; the filter layer is used for enabling the adjacent line identification units corresponding to the overlapped first line images to receive light with different wave bands.
2. The texture recognition assembly of claim 1, wherein two of the first texture images corresponding to two adjacent texture recognition units have an overlap region that includes the non-imaged regions of the two first texture images.
3. A display device comprising a display panel and the grain recognition assembly of claim 1 or 2;
The line identification assembly is arranged on one side of the display surface deviating from the display panel.
4. The display device according to claim 3, wherein the display device has a display region including a light emitting region and a light transmitting region; the line recognition unit is located in the light-transmitting area.
5. A display device is characterized by comprising a light-emitting device, a plurality of line identification units and a filter layer;
The filter layer is arranged on one side, close to the display surface of the display device, of the line identification unit;
The light signal received by the line identification unit can be used for forming a corresponding first line image, and the first line image is provided with an imaging area and a non-imaging area; the non-imaging region of one of the first texture images overlaps the imaging region of at least one other first texture image;
The filter layer comprises a plurality of filter units, and the orthographic projection of each filter unit on a display surface is overlapped with the orthographic projection of one line identification unit on the display surface; the filter layer is used for enabling the adjacent line identification units corresponding to the overlapped first line images to receive light with different wave bands.
6. The display device according to claim 5, wherein two of the first grain images corresponding to two adjacent grain recognition units have an overlapping region including the non-imaging regions of the two first grain images.
7. The display device according to claim 5, wherein the filter layer is provided on a side of the light-emitting device close to the display surface;
The light filtering unit and the line identification unit are in one-to-one correspondence with the light emitting devices, and the orthographic projection of the light filtering unit on the display surface is overlapped with the orthographic projection of the corresponding light emitting device on the display surface;
Every three adjacent filtering units form a filtering group, and the three filtering units in the filtering group are respectively used for enabling three primary colors to pass through.
8. The display device according to claim 7, wherein the light emitted from the light-emitting device is white light.
9. The display device according to claim 7 or 8, wherein the display device has a display region including a light emitting region and a light transmitting region; the line recognition unit is located in the light-transmitting area.
10. the display device according to claim 7 or 8, wherein the light emitting device and the texture recognition unit are provided in the same layer.
11. The display device according to claim 5 or 6, wherein colors of light emitted from the light emitting devices are three primary colors;
The filter layer is arranged between the light-emitting device and the line identification unit.
12. The display device according to claim 11, wherein the display device has a display region including a light emitting region and a light transmitting region;
The line identification unit is arranged in the light-transmitting area.
13. A method of texture recognition of a display device according to any one of claims 3 to 4 or 5 to 12, wherein the method of texture recognition comprises a detection phase;
the detection phase comprises:
acquiring a first electric signal converted from an optical signal on the line identification unit in each frame;
According to the response rate of the line identification unit to the light received by the line identification unit, carrying out normalization processing on the first electric signal to obtain a second electric signal;
and splicing a second grain image according to the second electric signal.
14. The method of claim 13, wherein prior to the detecting stage, the method further comprises a calibrating stage;
The calibration phase comprises:
Repeating the steps for multiple times to enable the grain identification unit to receive light of different wave bands;
And obtaining the response rate of the texture recognition unit to light of different wave bands according to a third electric signal converted by the texture recognition unit to the light received by the texture recognition unit.
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