CN110569803B - Grain identification assembly, display device and grain identification method thereof - Google Patents

Abstract

Embodiments of the present invention provide a texture identification component, a display device and a texture identification method thereof, and relate to the technical field of display. A complete texture image can be obtained without time-sharing display, thereby improving the accuracy of texture identification. The texture identification component includes a substrate, a plurality of texture identification units and a filter layer stacked on the substrate; the optical signal received by the texture identification unit can be used to form a corresponding first texture image, and the first texture image has an imaging area and a filter layer. The non-imaging area; the non-imaging area of one first texture image overlaps with the imaging area of at least one other first texture image; the filter layer includes a plurality of filter units, and the orthographic projection of each filter unit on the substrate is the same as that of one filter unit. The orthographic projections of the pattern recognition units on the substrate are overlapped; the filter layer is used to enable adjacent pattern recognition units corresponding to the overlapping first pattern images to receive light of different wavelength bands.

Description

A texture recognition component, a display device and a texture recognition method thereof

technical field

The present invention relates to the field of display technology, and in particular, to a texture identification component, a display device and a texture identification method thereof.

Background technique

At present, the fingerprint recognition function has become an indispensable part of mobile phones. Among them, under-screen fingerprint recognition is a popular research topic.

The principle of under-screen fingerprint recognition is: after the display light emitted from the display panel is reflected by the finger, it is irradiated on the optical sensor. The optical sensor converts the optical signal into an electrical signal, and obtains a fingerprint image according to the electrical signal. Since the self-fingerprint of a finger includes valleys and ridges, the light intensity reflected by the valleys and ridges is different, and the electrical signals converted by the optical sensor are also different, so as to perform fingerprint recognition.

However, since most of the light emitted by the sub-pixels is light with a small angle, and the valley of the finger cannot be in direct contact with the display device, there is air between the two. Therefore, when the small-angle light reflected by the valley of the finger enters the display device from the air, total reflection occurs, resulting in the existence of a non-imaging area in the texture image as shown in FIG. 1 .

In the prior art, as shown in FIG. 2 , in order to obtain a complete fingerprint image, the display device can be time-divisionally lit, and the non-imaging area of the optical sensor can be filled to realize complementary imaging. However, the time-sharing lighting will prolong the exposure integration time, and the light reflected by the finger will have an afterimage on the optical sensor, resulting in inaccurate light received by the optical sensor, thereby affecting the accuracy of fingerprint recognition.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a texture identification component, a display device and a texture identification method thereof, which can obtain a complete texture image without time-sharing display, thereby improving the accuracy of texture identification.

To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

In a first aspect, a texture identification component is provided, comprising a substrate, a plurality of texture identification units and a filter layer stacked on the substrate; the optical signal received by the texture identification unit can be used to form a corresponding first a texture image, the first texture image has an imaging area and a non-imaging area; the non-imaging area of one of the first texture images overlaps the imaging area of at least one other first texture image; the filter layer Including a plurality of filter units, the orthographic projection of each of the filter units on the substrate overlaps with the orthographic projection of one of the texture recognition units on the substrate; the filter layer is used to make and The adjacent texture recognition units corresponding to the overlapping first texture images receive light of different wavelength bands.

Optionally, the two first texture images corresponding to two adjacent texture identification units have overlapping areas, and the overlapping areas include the non-imaging areas of the two first texture images.

In a second aspect, a display device is provided, comprising a display panel and the texture identification component described in the first aspect; the texture identification component is disposed on a side away from a display surface of 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 pattern recognition unit is located in the light-transmitting area.

In a third aspect, a display device is provided, comprising a light-emitting device, a plurality of texture identification units and a filter layer; the filter layer is disposed on a side of the texture identification unit close to the display surface of the display device; the texture The optical signal received by the identification unit can be used to form a corresponding first texture image, the first texture image has an imaging area and a non-imaging area; the non-imaging area of one of the first texture images and at least one other first texture The imaging area of the image overlaps; the filter layer includes a plurality of filter units, the orthographic projection of each filter unit on the display surface and the orthographic projection of one of the texture recognition units on the display surface Overlapping; the filter layer is used for enabling the adjacent texture identification units corresponding to the overlapping first texture images to receive light of different wavelength bands.

Optionally, the two first texture images corresponding to two adjacent texture identification units have overlapping areas, and the overlapping areas include the non-imaging areas of the two first texture images.

Optionally, the filter layer is disposed on the side of the light-emitting device close to the display surface; the filter unit and the pattern recognition unit are in one-to-one correspondence with the light-emitting device, and the filter unit The orthographic projection on the display surface overlaps with the orthographic projection of the corresponding light-emitting device on the display surface; every three adjacent filter units constitute a filter group, and three filter units in the filter group Each of the filter units is respectively used to pass the three primary colors.

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 pattern recognition unit is located in the light-transmitting area.

Optionally, the light-emitting device and the pattern recognition unit are disposed on the same layer.

Optionally, the colors of the light emitted by the light-emitting device are mutually three primary colors; the filter layer is disposed between the light-emitting device and the pattern recognition unit.

Optionally, the display device has a display area, and the display area includes a light-emitting area and a light-transmitting area; the pattern recognition unit is disposed in the light-transmitting area.

A fourth aspect provides a texture recognition method for a display device according to the second aspect or the third aspect, wherein the texture identification method includes a detection stage; the detection stage includes: acquiring the information on the texture identification unit in each frame by the first electrical signal converted from the optical signal; according to the response rate of the light received by the pattern recognition unit, the first electrical signal is normalized to obtain the second electrical signal; the second electrical signal is spliced according to the second electrical signal. The second texture image.

Optionally, before the detection stage, the pattern recognition method further includes a calibration stage; the calibration stage includes: repeating multiple times to make the pattern recognition unit receive light of different wavelength bands; The received third electrical signal converted by light is used to obtain the response rate of the pattern recognition unit to light of different wavelength bands.

Embodiments of the present invention provide a texture identification component, a display device, and a texture identification method thereof. The texture identification component includes a texture identification unit. The optical signal received by the texture identification unit can form a corresponding first texture image. The imaged area overlaps with the imaged area of at least one other first texture image, so that the non-imaged area of the first texture image can be filled. On this basis, in order to avoid the influence of the accuracy of the pattern recognition due to the overlapping of the imaging areas of the multiple first pattern images, the pattern recognition component further includes a filter layer stacked with the pattern recognition unit, and the filter layer is used to make and The adjacent pattern recognition units corresponding to the overlapping first pattern images receive light of different wavelength bands, and after the optical signal received by the pattern recognition unit is converted into the first electrical signal, it can be determined according to the response rate of the pattern recognition unit to the light received by the pattern recognition unit. The first electrical signal is normalized to obtain the second electrical signal, and then the second texture image filled in the non-imaging area is spliced according to the second electrical signal, so as to obtain a more complete second texture image. The wavelength bands of the light received by the pattern recognition unit corresponding to the first pattern image are different. Therefore, when the pattern recognition component is applied to a display device, the accuracy of pattern recognition can be improved without time-sharing display.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a regional distribution diagram of a texture image provided by the prior art;

FIG. 2 is a schematic structural diagram of a texture recognition component according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a texture recognition component according to an embodiment of the present invention;

4 is a regional distribution diagram of a first texture image provided by 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 method for texture detection provided by an embodiment of the present invention;

FIG. 10 is a flowchart of a calibration stage provided by an embodiment of the present invention.

Reference number:

10-substrate; 11-texture identification unit; 12-filter unit; 21-light-emitting device; 211-first electrode; 212-light-emitting functional layer; 213-second electrode; 22-thin film transistor; 31-adhesive layer .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a texture identification component, as shown in FIG. 2 and FIG. 3 , comprising a substrate 10, a plurality of texture identification units 11 and a filter layer stacked on the substrate 10; the texture identification unit 11 receives the The light signal can be used to form a corresponding first texture image, and the first texture image has an imaging area and a non-imaging area; as shown in FIG. 4 , the non-imaging area of one first texture image and the imaging area of at least one other first texture image Overlapping; the filter layer includes a plurality of filter units 12, and the orthographic projection of each filter unit 12 on the substrate 10 overlaps with the orthographic projection of a texture recognition unit 11 on the substrate 10; the filter layer is used to make and The adjacent pattern recognition units 11 corresponding to the overlapping first pattern images receive light of different wavelength bands.

Here, those skilled in the art should know that a plurality of texture identification units 11 are arranged on a surface perpendicular to the thickness of the substrate 10 , and the orthographic projections of the multiple texture identification units 11 on the substrate 10 do not overlap. The area of the first texture image formed according to the optical signal received by the texture identification unit 11 may be larger than that of the texture identification unit 11 . Therefore, even if the orthographic projections of the adjacent texture identification units 11 on the substrate 10 do not overlap, the first texture images formed according to the optical signals received by the adjacent texture identification units 11 may or may not overlap. The distance between adjacent pattern recognition units 11 is related.

In this embodiment of the present invention, the distance between adjacent texture identification units 11 can be reasonably designed, so that the non-imaging area of one first texture image overlaps the imaging area of at least one other first texture image.

In some embodiments, the specific structure of the pattern recognition unit 11 is not limited, as long as the pattern recognition unit 11 can convert optical signals into electrical signals.

For example, the texture recognition unit 11 may be a photoelectric sensor, a photosensitive sensor, or the like.

In some embodiments, the texture identification component may further include a texture identification circuit. The texture identification unit 11 receives the optical signal and converts the optical signal into an electrical signal, and then the texture identification circuit can obtain the first texture image according to the electrical signal.

In some embodiments, the colors of light of different wavelength bands received by adjacent texture identification units 11 corresponding to the overlapping first texture images may be the same or different.

For example, if the wavelength bands of the light received by the two adjacent texture recognition units 11 corresponding to the two overlapping first texture images are 630-700 nm and 701-750 nm, respectively, then the two texture recognition units 11 receive The wavelengths of light are different and the color is the same.

Or, if the wavelength bands of the light received by the two adjacent texture identification units 11 corresponding to the two overlapping first texture images are 630-700 nm and 500-560 nm respectively, then the light received by the two texture identification units 11 The bands and colors are different.

In some embodiments, the filter layer is used to enable adjacent texture identification units 11 corresponding to the overlapping first texture images to 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 filter units 12 may correspond to and overlap with the pattern recognition units 11 one-to-one, and the filter units 12 corresponding to the pattern recognition units 11 receiving light of different wavelength bands may allow light of different wavelength bands to pass through Or, as shown in FIG. 3 , a part of the pattern recognition unit 11 is in one-to-one correspondence with the filter unit 12, and another part of the pattern recognition unit 11 has no filter unit 12 corresponding to it, so that this part of the pattern recognition unit 11 can receive white light .

In some embodiments, as shown in FIG. 3 , the texture identification unit 11 may be disposed on the side of the filter layer close to the substrate 10 ; or, the texture identification unit 11 may also be disposed on the side of the filter layer away from the substrate 10 .

Here, the arrangement position of the pattern recognition unit 11 and the filter layer relative to the substrate 10 is based on the incident direction of the light incident on the pattern recognition unit 11, and it should be ensured that the light passes through the filter layer first, and then irradiates the pattern on the identification unit 11.

In some embodiments, the non-imaged area of one first texture image may be completely covered by the imaged areas of other first texture images, or may be partially covered by the imaged areas of other first texture images.

An embodiment of the present invention provides a texture identification component, the texture identification component includes a texture identification unit 11, the optical signal received by the texture identification unit 11 can form a corresponding first texture image, a non-imaging area of a first texture image and at least one other texture image The imaged areas of the first texture image overlap so that the non-imaged areas of the first texture image can be filled. On this basis, in order to avoid affecting the accuracy of the pattern recognition due to the overlapping of the imaging areas of the multiple first pattern images, the pattern recognition component further includes a filter layer stacked with the pattern recognition unit 11, and the filter layer is used to make The adjacent pattern recognition units 11 corresponding to the overlapping first pattern images receive light of different wavelength bands. After the optical signal received by the pattern recognition unit 11 is converted into the first electrical signal, the light signal received by the pattern recognition unit 11 can be converted into a first electrical signal. Responsive rate, normalize the first electrical signal to obtain the second electrical signal, and then splice the second texture image filled in the non-imaging area according to the second electrical signal, so as to obtain a more complete second texture image. The wavelength band of the light received by the texture identification unit 11 corresponding to the overlapping first texture image is different. Therefore, when the texture identification component is applied to a display device, the accuracy of texture identification can be improved without time-sharing display.

Here, the response rate includes: the efficiency of converting the optical signal received by the pattern recognition unit 11 into the first electrical signal.

Optionally, as shown in FIG. 4 , two first texture images corresponding to two adjacent texture identification units 11 have overlapping areas, and the overlapping areas include non-imaging areas of the two first texture images.

In the embodiment of the present invention, since the overlapping area of the two first texture images corresponding to the two adjacent texture recognition units 11 includes the non-imaging areas of the two first texture images, the filter layer is used to make multiple The pattern recognition unit 11 only needs to receive light of two different wavelength bands. Compared with the fact that the filter layer is used to enable the plurality of pattern recognition units 11 to receive light of two or more different wavelength bands, the embodiment of the present 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 FIG. 5b, comprising a display panel and the pattern recognition component described in any of the foregoing embodiments; the pattern recognition component is disposed on a side away from the display surface of 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 that are stacked in sequence. The first electrode 211 is an anode and the second electrode 213 is a cathode; or, the first electrode 211 is a cathode and the second electrode 213 is an anode.

The pixel circuit includes at least a 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, FIGS. 5a and 5b only show the driving transistors in the pixel circuit.

In some embodiments, the display panel may be, for example, an organic light-emitting diode (Organic Light-Emitting Diode, OLED for short) display panel, or a Quantum Dot Light Emitting Diodes (QLED for short) display panel.

Here, if the display panel is an OLED display panel, the light-emitting functional layer 212 is an organic light-emitting functional 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 top-emitting; as shown in FIG. 5b, the light-emitting device 21 may also be bottom-emitting.

In some embodiments, the pattern recognition principle of the display device is as follows: the light emitting device 21 emits display light, and part of the display light is emitted by the finger, and then irradiates the pattern 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 may be located in a part of the display area.

Optionally, the texture recognition component is located in a part of the display area, so that when the texture recognition is performed, the area in the display area without the texture recognition component can still display the picture normally.

In some embodiments, the texture recognition component can be fixedly bonded to the display panel through the adhesive layer 31 .

For example, the material of the adhesive layer 31 may be optically clear glue.

An embodiment of the present invention provides a display device, including a display panel and the texture recognition assembly described in any of the foregoing embodiments. The texture identification component includes a texture identification unit 11, and the optical signal received by the texture identification unit 11 can form a corresponding first texture image, and the non-imaging area of one first texture image overlaps with the imaging area of at least one other first texture image. Now, the non-imaging area of the first texture image can be filled. On this basis, in order to avoid affecting the accuracy of the pattern recognition due to the overlapping of the imaging areas of the multiple first pattern images, the pattern recognition component further includes a filter layer stacked with the pattern recognition unit 11, and the filter layer is used to make The adjacent pattern recognition units 11 corresponding to the overlapping first pattern images receive light of different wavelength bands. After the optical signal received by the pattern recognition unit 11 is converted into the first electrical signal, the light signal received by the pattern recognition unit 11 can be converted into a first electrical signal. Responsive rate, normalize the first electrical signal to obtain the second electrical signal, and then splice the second texture image filled in the non-imaging area according to the second electrical signal, so as to obtain a more complete second texture image. The wavelength band of the light received by the pattern recognition unit 11 corresponding to the overlapping first pattern image is different. Therefore, the display device can improve the precision of pattern recognition without time-sharing display.

Optionally, as shown in FIG. 5a and FIG. 5b, the display device has a display area, and the display area includes a light-emitting area and a light-transmitting area; the pattern recognition unit 11 is located in the light-transmitting area.

In some embodiments, the filter unit 12 may be located only in the light-transmitting area; alternatively, the filter unit 12 may also be located in the light-transmitting area and the light-emitting area.

In some embodiments, the thin film transistor 22 is located in the light-transmitting region, and the materials of the gate electrode, the source electrode and the drain electrode of the thin film transistor 22 are all conductive materials. The conductive material can be a metal or a transparent oxide.

In the case where the conductive material is metal, the light reflected by the finger cannot be irradiated on the pattern recognition unit 11 due to the metal shading. Therefore, the orthographic projection of the pattern recognition unit 11 and the filter unit 12 on the display panel can be matched with the thin film transistor 22. No overlap.

For the light emitting device 21 emitting on one side, part of the display light emitted by the light emitting device 21 may be transmitted to the pattern recognition unit 11 from the side opposite to the light emitting side, affecting the accuracy of the pattern recognition unit 11 .

Based on this, in the present invention, by making the orthographic projection of the texture recognition unit 11 on the display panel located in the light-transmitting area, the display light emitted from the light-emitting device 21 can be prevented from being directly transmitted to the texture recognition unit 11 without being reflected by the finger, which affects the texture recognition. accuracy.

An embodiment of the present invention also provides a display device, as shown in FIG. 6a and FIG. 6b, comprising a light-emitting device 21, a plurality of texture identification units 11 and a filter layer; the filter layer is disposed on the texture identification unit 11 close to the display of the display device face side; the light signal received by the texture identification unit 11 can be used to form a corresponding first texture image, the first texture image has an imaging area and a non-imaging area; the non-imaging area of a first texture image and at least one other first texture The imaging areas of the images overlap; the filter layer includes a plurality of filter units 12, and the orthographic projection of each filter unit 12 on the display surface overlaps with the orthographic projection of a texture recognition unit 11 on the display surface; the filter layer is used for The adjacent texture identification units 11 corresponding to the overlapping first texture images are made to receive light of different wavelength bands.

Here, those skilled in the art should know that a plurality of texture identification units 11 are arranged on a surface perpendicular to the thickness of the display device, and the orthographic projections of the multiple texture identification units 11 on the filter layer do not overlap. The area of the first texture image formed according to the optical signal received by the texture identification unit 11 may be larger than that of the texture identification unit 11 . Therefore, even if the orthographic projections of the adjacent texture identification units 11 on the filter layer do not overlap, the first texture images formed according to the optical signals received by the adjacent texture identification units 11 may or may not overlap. The distance between adjacent pattern recognition units 11 is related.

In this embodiment of the present invention, the distance between adjacent texture identification units 11 can be reasonably designed, so that the non-imaging area of one first texture image overlaps the imaging area of at least one other first texture image.

In some embodiments, the specific structure of the pattern recognition unit 11 is not limited, as long as the pattern recognition unit 11 can convert optical signals into electrical signals.

For example, the texture recognition unit 11 may be a photoelectric sensor, a photosensitive sensor, or the like.

In some embodiments, the display device may further include a texture recognition circuit. The texture identification unit 11 receives the optical signal and converts the optical signal into an electrical signal, and then the texture identification circuit can obtain the first texture image according to the electrical signal.

In some embodiments, the colors of light of different wavelength bands received by adjacent texture identification units 11 corresponding to the overlapping first texture images may be the same or different.

For example, if the wavelength bands of the light received by the two adjacent texture recognition units 11 corresponding to the two overlapping first texture images are 630-700 nm and 701-750 nm, respectively, then the two texture recognition units 11 receive The wavelengths of light are different and the color is the same.

Or, if the wavelength bands of the light received by the two adjacent texture identification units 11 corresponding to the two overlapping first texture images are 630-700 nm and 500-560 nm respectively, then the light received by the two texture identification units 11 The bands and colors are different.

In some embodiments, the filter layer is used to enable adjacent texture identification units 11 corresponding to the overlapping first texture images to 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 filter unit 12 may correspond to and overlap with the pattern recognition unit 11 one-to-one, and the filter unit 12 corresponding to the pattern recognition unit 11 receiving light of different wavelength bands may allow light of different wavelength bands to pass through Or, as shown in FIG. 3, a part of the pattern recognition unit 11 is in one-to-one correspondence with the filter unit 12, and another part of the pattern recognition unit 11 has no filter unit 12 corresponding to it, so that this part of the pattern recognition unit 11 can receive white light .

In some embodiments, whether the light-emitting device 21 is top-emitting or bottom-emitting, the filter layer is disposed on the side of the pattern recognition unit 11 close to the display surface of the display device to ensure that the light reflected by the finger first passes through the filter layer, Then, it is irradiated to the texture recognition unit 11 .

Here, according to the actual design, the filter layer may be disposed on the side of the light-emitting device 21 close to the display surface; or, the filter layer may also be disposed between the light-emitting device 21 and the texture identification unit 11 .

In some embodiments, the non-imaged area of one first texture image may be completely covered by the imaged areas of other first texture images, or may be partially covered by the imaged areas of other first texture images.

In some embodiments, the display device 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 that are stacked in sequence. The first electrode 211 is an anode and the second electrode 213 is a cathode; or, the first electrode 211 is a cathode and the second electrode 213 is an anode.

The pixel circuit includes at least a 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, FIGS. 6a and 6b only show the driving transistors in the pixel circuit.

In some embodiments, the display device may be, for example, an OLED display device, a QLED display device, or the like.

Here, if the display device is an OLED display device, the light-emitting functional layer 212 is an organic light-emitting functional layer; if the display device is a QLED display device, the light-emitting functional layer 212 is a quantum dot light-emitting functional layer.

In some embodiments, as shown in FIG. 6a, the light-emitting device 21 may be top-emitting; or, as shown in FIG. 6b, the light-emitting device 21 may also be bottom-emitting.

In some embodiments, the pattern recognition principle of the display device is as follows: the light emitting device 21 emits display light, and part of the display light is reflected by the finger and then irradiated onto the pattern 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 may be located in a part of the display area.

Optionally, the texture recognition component is located in a part of the display area, so that when the texture recognition is performed, the area in the display area without the texture recognition component can still display the picture normally.

An embodiment of the present invention provides a display device. The display device includes a texture identification unit 11. The optical signal received by the texture identification unit 11 can form a corresponding first texture image, and the non-imaging area of one first texture image is associated with at least one other first texture image. The imaged areas of the texture images overlap, so that the non-imaged areas of the first texture image can be filled with the imaged areas of other first texture images. On this basis, in order to avoid affecting the accuracy of the pattern recognition component due to the overlapping of the imaging areas of the plurality of first pattern images, the display device further includes a filter layer disposed on the side of the pattern recognition unit 11 close to the display surface. The layer is used to make the adjacent texture identification units 11 corresponding to the overlapping first texture images receive light of different wavelength bands. After the optical signal received by the texture identification unit 11 is converted into a first electrical signal, it can The responsivity of the received light, the first electrical signal is normalized to obtain the second electrical signal, and then the second texture image filled in the non-imaging area is spliced according to the second electrical signal. The wavelength bands of the light received by the texture identification unit 11 corresponding to the texture image are different, so the display device can obtain a relatively complete second texture image without time-sharing display, thereby improving the accuracy of texture identification.

Optionally, as shown in FIG. 4 , two first texture images corresponding to two adjacent texture identification units 11 have overlapping areas, and the overlapping areas include non-imaging areas of the two first texture images.

In this embodiment of the present invention, since the overlapping area of the two first texture images corresponding to the two adjacent texture recognition units 11 includes the non-imaging areas of the two first texture images, the filter layer is used to make multiple The pattern recognition unit 11 only needs to receive light of two different wavelength bands. Compared with the fact that the filter layer is used to enable the plurality of pattern recognition units 11 to receive light of two or more different wavelength bands, the embodiment of the present invention can simplify the preparation process of the filter layer.

Optionally, as shown in FIG. 7 , the filter layer is arranged on the side of the light-emitting device 21 close to the display surface; the filter unit 12 and the pattern recognition unit 11 are in one-to-one correspondence with the light-emitting device 21 , and the filter unit 12 is on the display surface. The orthographic projection on it overlaps with the orthographic projection of its 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 to make Three primary colors pass. Here, FIG. 7 only shows the case where the light-emitting device 21 is top-emitting.

In some embodiments, the three primary colors may be mutually red, green, and blue; or, the three primary colors may be mutually cyan, yellow, and magenta.

In some embodiments, the light emitted by the light emitting device 21 may be white light; or, the colors of the light emitted by the plurality of light emitting devices 21 may also be three primary colors of each other.

When the colors of the light emitted by the plurality of light emitting devices 21 are mutually 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 by the corresponding light emitting device 21 .

In the embodiment of the present invention, the filter layer is arranged on the 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 to pass the three primary colors. In this way, if the light-emitting device 21 If the light emitted is white light, the filter layer can also be used to filter out the white light, so that the display device can display a color picture; The light of the three primary colors emitted by the 21 is filtered out, which can improve the display effect of the display device.

Optionally, as shown in FIG. 6a and FIG. 6b, the display device has a display area, and the display area includes a light-emitting area and a light-transmitting area; the pattern recognition unit 11 is located in the light-transmitting area.

In some embodiments, since the orthographic projection of the filter unit 12 and its corresponding light-emitting device 21 on the display surface overlaps, and the orthographic projection of each filter unit 12 on the display surface and a texture recognition unit 11 on the display surface The orthographic projections on it overlap, therefore, the filter unit 12 is located in both the light-emitting area and the light-transmitting area.

In some embodiments, the thin film transistor 22 is located in the light-transmitting region, and the materials of the gate electrode, the source electrode and the drain electrode of the thin film transistor 22 are all conductive materials. The conductive material can be a metal or a transparent oxide.

In the case where the conductive material is metal, the light reflected by the finger cannot be irradiated on the pattern recognition unit 11 due to the metal shading. Therefore, the orthographic projection of the pattern recognition unit 11 and the filter unit 12 on the display panel can be matched with the thin film transistor 22. No overlap.

For the light emitting device 21 emitting on one side, part of the display light emitted by the light emitting device 21 may be transmitted to the pattern recognition unit 11 from the side opposite to the light emitting side, affecting the accuracy of the pattern recognition unit 11 .

Based on this, in the present invention, by making the orthographic projection of the texture recognition unit 11 on the display panel located in the light-transmitting area, the display light emitted from the light-emitting device 21 can be prevented from being directly transmitted to the texture recognition unit 11 without being reflected by the finger, which affects the texture recognition. accuracy.

Optionally, as shown in FIG. 8 , the light emitting device 21 and the pattern recognition unit 11 are arranged on the same layer. Here, FIG. 8 only shows the case where the light-emitting device 21 is top-emitting.

In some embodiments, since the filter unit 12 and the texture identification unit 11 are in a one-to-one correspondence with the light-emitting device 21, and the orthographic projection of each filter unit 12 on the display surface is the same as that of one texture identification unit 11 on the display surface The orthographic projection overlaps, and the orthographic projection of the filter unit 12 on the display surface overlaps the orthographic projection of the corresponding light emitting device 21 on the display surface. Therefore, when the light-emitting device 21 and the pattern recognition unit 11 are disposed on the same layer, each filter unit 12 corresponds to one pattern 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, in order to prevent the light-emitting functional layer 212 from being denatured under the action of a high temperature and losing the light-emitting function. Optionally, in this embodiment of the present invention, the pattern recognition unit 11 may be formed first; then, the light-emitting device 21 may be formed.

In the embodiment of the present invention, by arranging the pattern recognition unit 11 and the light-emitting device 21 on the same layer, on the one hand, the pattern recognition unit 11 and the light-emitting device 21 can share a filter unit 12; The thickness is beneficial to the thin design of the display device.

Optionally, as shown in FIG. 6 a and FIG. 6 b , the colors of the light emitted by the light emitting device 21 are three primary colors with each other;

In the embodiment of the present invention, when the colors of the light emitted by the light-emitting device 21 are three primary colors, the filter layer can also be arranged between the light-emitting device 21 and the pattern recognition unit 11, and is only used to filter out the reflections reflected by the finger and The light irradiated on the texture recognition unit 11 .

Optionally, as shown in FIG. 6a and FIG. 6b, the display device has a display area, and the display area includes a light-emitting area and a light-transmitting area; the pattern recognition unit 11 is disposed in the light-transmitting area.

In some embodiments, the filter unit 12 may be located only in the light-transmitting area; alternatively, the filter unit 12 may also be located in the light-transmitting area and the light-emitting area.

In some embodiments, the thin film transistor 22 is located in the light-transmitting region, and the materials of the gate electrode, the source electrode and the drain electrode of the thin film transistor 22 are all conductive materials. The conductive material can be a metal or a transparent oxide.

In the case where the conductive material is metal, the light reflected by the finger cannot be irradiated on the pattern recognition unit 11 due to the metal shading. Therefore, the orthographic projection of the pattern recognition unit 11 and the filter unit 12 on the display panel can be matched with the thin film transistor 22. No overlap.

For the light emitting device 21 emitting on one side, part of the display light emitted by the light emitting device 21 may be transmitted to the pattern recognition unit 11 from the side opposite to the light emitting side, affecting the accuracy of the pattern recognition unit 11 .

Based on this, in the present invention, by making the orthographic projection of the texture recognition unit 11 on the display panel located in the light-transmitting area, the display light emitted from the light-emitting device 21 can be prevented from being directly transmitted to the texture recognition unit 11 without being reflected by the finger, which affects the texture recognition. accuracy.

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 Figure 9, the detection stage includes:

S11. Acquire the first electrical signal converted from the optical signal on the pattern recognition unit 11 in each frame.

Here, after the light emitted by the light emitting device 21 is reflected by the finger, it is irradiated onto the pattern recognition unit 11 through the filter layer, and the pattern recognition unit 11 converts the optical signal into the first electrical signal.

S12 , performing normalization processing on the first electrical signal according to the response rate of the light received by the pattern recognition unit 11 to obtain a second electrical signal.

In some implementations, there is no limitation on how the texture identification unit 11 obtains the responsivity of light in different wavelength bands.

S13, splicing a second texture image according to the second electrical 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 images, and at least two texture images used for splicing the second texture image. The wavelength bands of the light received by the texture identification unit 11 corresponding to the first texture image are different, and the response rates of the texture identification unit 11 to the light of different wavelength bands are different. Based on this, the first electrical signal needs to be normalized.

Here, the process of normalizing the first electrical signal may be as follows: after the pattern recognition unit 11 converts the received optical signal into the first electrical signal, the processor converts the at least two first electrical signals used for splicing the second pattern image. The first electrical signal converted by the pattern recognition unit 11 corresponding to a pattern image is separated; the separated first electrical signal is normalized.

Wherein, if the imaging areas of at least two first texture images used for splicing the second texture images overlap, only the first electrical signal converted by one of the texture recognition units 11 may be used.

As an example, assuming that a second texture image is obtained by splicing two first texture images, the light rays received by the texture identification unit 11 corresponding to the two first texture images are blue light and green light respectively, and the response of the texture identification unit 11 to blue light The rate of response to green light is 10%, and the response rate to green light is 20%, the normalization processing of the separated first signal includes: dividing the first electrical signal converted by blue light by 10%, and dividing the first electrical signal converted by green light by 10%. Divide the signal by 20%.

An embodiment of the present invention provides a texture recognition method for a display device, which has the same technical effect as the aforementioned display device, and details are not described herein again.

Optionally, before the detection stage, the pattern recognition method further includes a calibration stage.

As shown in Figure 10, the calibration phase includes:

S21, repeating multiple times to make the pattern recognition unit 11 receive light of different wavelength bands.

Here, the gray scales of light of different wavelength bands received by the texture identification unit 11 may be the same.

Exemplarily, the texture identification unit 11 receives blue light of 255 grayscale in the first frame, and at this time, only the light-emitting device 21 that emits blue light can be made to emit light; the texture identification unit 11 receives green light of 255 grayscale in the second frame, at this time , only the green light-emitting device 21 can be made to emit light.

S22 , obtaining the response rates of the texture identifying unit 11 to light of different wavelength bands according to the third electrical signal converted from the light received by the texture identifying unit 11 .

Here, the response rate of the texture identification unit 11 to light of different wavelength bands can be calculated by the processor.

In some embodiments, the response rates of the pattern recognition unit 11 to light of different wavelength bands obtained through the calibration stage may be pre-stored in the memory of the display device and directly recalled during the detection stage; or, before each detection stage , to obtain the response rate of the texture recognition unit 11 to light of different wavelength bands.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (14)

1. A pattern recognition assembly, characterized in that, comprising a substrate, a plurality of pattern recognition units and a filter layer that are stacked and arranged on the substrate; The light signal received by the texture identification unit can be used to form a corresponding first texture image, and the first texture image has an imaging area and a non-imaging area; the non-imaging area of one of the first texture images is associated with at least one other texture image. the imaging regions of the first texture image overlap; The filter layer includes a plurality of filter units, and the orthographic projection of each filter unit on the substrate overlaps with the orthographic projection of one of the texture recognition units on the substrate; the filter unit The layer is used to make the adjacent texture recognition units corresponding to the overlapping first texture images receive light of different wavelength bands. 2 . The texture recognition component according to claim 1 , wherein two of the first texture images corresponding to two adjacent texture recognition units have an overlapping area, and the overlapping area includes two of the first texture images. 3 . the non-imaged area of the first texture image. 3. A display device, characterized in that, comprising a display panel and the texture recognition assembly according to claim 1 or 2; The texture recognition component is disposed on a side away from the display surface of the display panel. 4 . The display device according to claim 3 , wherein the display device has a display area, and the display area includes a light-emitting area and a light-transmitting area; the pattern recognition unit is located in the light-transmitting area. 5 . 5. A display device, characterized in that it comprises a light-emitting device, a plurality of pattern recognition units and a filter layer; the filter layer is disposed on the side of the pattern recognition unit close to the display surface of the display device; The light signal received by the texture identification unit can be used to form a corresponding first texture image, and the first texture image has an imaging area and a non-imaging area; the non-imaging area of one of the first texture images is associated with at least one other texture image. the imaging regions of the first texture image overlap; The filter layer includes a plurality of filter units, and the orthographic projection of each filter unit on the display surface overlaps with the orthographic projection of one of the texture recognition units on the display surface; The adjacent texture recognition units corresponding to the overlapping first texture images receive light of different wavelength bands. 6 . The display device according to claim 5 , wherein two of the first texture images corresponding to two adjacent texture recognition units have an overlapping area, and the overlapping area includes two of the first texture images. 7 . The non-imaged region of a textured image. 7. The display device according to claim 5, wherein the filter layer is disposed on a side of the light-emitting device close to the display surface; The filter unit and the texture recognition unit are in one-to-one correspondence with the light-emitting device, and the orthographic projection of the filter unit on the display surface and the orthographic projection of the corresponding light-emitting device on the display surface are Projection overlap; Every three adjacent filter units constitute a filter group, and the three filter units in the filter group are respectively used to pass the three primary colors. 8. The display device according to claim 7, wherein the light emitted by the light emitting device is white light. 9 . The display device according to claim 7 or 8 , wherein the display device has a display area, the display area includes a light-emitting area and a light-transmitting area, and the texture recognition unit is located in the light-transmitting area. 10 . 10 . The display device according to claim 7 or 8 , wherein the light-emitting device and the texture recognition unit are arranged in the same layer. 11 . 11. The display device according to claim 5 or 6, wherein the colors of the light emitted by the light-emitting device are mutually three primary colors; The filter layer is disposed between the light-emitting device and the pattern recognition unit. 12 . The display device according to claim 11 , wherein the display device has a display area, and the display area includes a light-emitting area and a light-transmitting area; 12 . The pattern recognition unit is arranged in the light-transmitting area. 13. A texture recognition method for a display device according to any one of claims 3-4 or 5-12, wherein the texture identification method comprises a detection stage; The detection stage includes: Acquiring the first electrical signal converted by the optical signal on the pattern recognition unit in each frame; According to the response rate of the light received by the pattern recognition unit, the first electrical signal is normalized to obtain the second electrical signal; A second texture image is spliced according to the second electrical signal. 14. The texture identification method of a display device according to claim 13, wherein before the detection stage, the texture identification method further comprises a calibration stage; The calibration stage includes: Repeating multiple times to make the pattern recognition unit receive light of different wavelength bands; According to the third electrical signal converted from the light received by the texture identification unit, the response rate of the texture identification unit to light of different wavelength bands is obtained.

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