CN111985415A - Display panel, display device and control method of display panel - Google Patents
Display panel, display device and control method of display panel Download PDFInfo
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- CN111985415A CN111985415A CN202010858440.6A CN202010858440A CN111985415A CN 111985415 A CN111985415 A CN 111985415A CN 202010858440 A CN202010858440 A CN 202010858440A CN 111985415 A CN111985415 A CN 111985415A
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- 230000005684 electric field Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002346 layers by function Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 125000001475 halogen functional group Chemical group 0.000 description 1
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- 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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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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
- G06V40/1347—Preprocessing; Feature extraction
Abstract
The invention discloses a display panel, a display device and a control method of the display panel. The display panel includes: a substrate base plate; a light emitting element layer on the base substrate; the light emitting element layer includes a plurality of light emitting elements arranged in an array; a light-shielding layer; the light shielding layer comprises a plurality of through holes; the vertical projection of the through hole on the substrate base plate is positioned in the vertical projection of the gap of the adjacent light-emitting element on the substrate base plate; the touch control unit is used for acquiring a touch control signal; the control unit is electrically connected with the touch control unit; the touch control device is used for generating a first data signal according to a touch control signal when fingerprint identification is carried out; the input end of the gating unit is electrically connected with the control unit, and the output end of the gating unit is electrically connected with the light-emitting element; the fingerprint identification device is used for conducting during fingerprint identification, and transmitting the first data signal to the part of the light-emitting elements close to the edge of the through hole, so that the part of the light-emitting elements close to the edge of the through hole stops emitting light, the signal-to-noise ratio of the fingerprint signal can be improved, and the noise of a fingerprint image is reduced.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel, a display device, and a control method of the display panel.
Background
In the display device based on optics fingerprint identification module that has now, can utilize the principle formation of image of aperture to form the fingerprint image. Specifically, the light beams reflected back by the finger form a reduced and inverted partial fingerprint image through the small hole, all the partial fingerprint images are spliced to form a complete fingerprint image, and the finally formed fingerprint image has higher resolution.
The distance between pixel units in the high-resolution display device is small, so that the size of the small hole is small, the imaging noise is strong, and the collection of fingerprint signals is influenced.
Disclosure of Invention
The invention provides a display panel, a display device and a control method of the display panel, which are used for reducing the noise of a fingerprint image.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a substrate base plate;
a light emitting element layer on one side of the substrate base plate; the light emitting element layer comprises a plurality of light emitting elements arranged in an array;
a light-shielding layer; the light shielding layer comprises a plurality of through holes; the vertical projection of the through hole on the substrate base plate is positioned in the vertical projection of the gap between the adjacent light-emitting elements on the substrate base plate;
the touch control unit is used for acquiring a touch control signal;
the control unit is electrically connected with the touch control unit; the touch control device is used for generating a touch control signal according to a touch control signal when fingerprint identification is carried out;
the input end of the gating unit is electrically connected with the control unit, and the output end of the gating unit is electrically connected with the light-emitting element; the light emitting elements are used for transmitting the first data signal to the part close to the edge of the through hole to stop emitting light so as to stop emitting light to the part close to the edge of the through hole.
In a second aspect, an embodiment of the present invention provides a display device, including any one of the display panels provided in the first aspect.
In a third aspect, an embodiment of the present invention provides a control method for a display panel, which is suitable for any one of the display panels provided in the first aspect.
According to the technical scheme provided by the embodiment of the invention, the touch control signal can be obtained through the touch control unit, the control unit is electrically connected with the touch control unit through the control unit, the control unit can generate the first data signal according to the received touch control signal when fingerprint identification is carried out, the input end of the gating unit is electrically connected with the control unit through the gating unit, and the output end of the gating unit is electrically connected with the light-emitting element. The gating unit is conducted when fingerprint identification is carried out, and the first data signal can be transmitted to the part of the light-emitting elements close to the edge of the through hole, so that the part of the light-emitting elements close to the edge of the through hole stops emitting light. So, can control the partial light emitting component that is close to the through-hole 131 edge and stop luminous, avoid being close to the light beam at through-hole edge and directly incide to the condition of fingerprint identification unit through the finger, reduce the semaphore that does not carry fingerprint information, reduce the noise that fingerprint identification unit received promptly, improve the SNR of fingerprint signal to reduce the noise of fingerprint image, improve the quality of fingerprint image.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a diffraction pattern of a via according to an embodiment of the present invention;
fig. 4 is a schematic optical path diagram of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic top view illustrating a display panel according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a control method of a display panel according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a control method for a display panel according to another embodiment of the present invention;
FIG. 9 is a flowchart illustrating a control method for a display panel according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display panel during fingerprint identification according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating a control method of a display panel according to another embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and as shown in fig. 1, the display panel 100 includes:
a base substrate 110, a light emitting element layer 120 located on one side of the base substrate 110; the light emitting element layer 120 includes a plurality of light emitting elements 121 arranged in an array. A light-shielding layer 130; the light-shielding layer 130 includes a plurality of through holes 131; the vertical projection of the through-hole 131 on the substrate base 110 is located within the vertical projection of the gap of the adjacent light emitting element 121 on the substrate base 110.
The touch unit 140 is configured to obtain a touch signal. A control unit electrically connected to the touch unit 140; the touch control circuit is used for generating a first data signal according to the touch control signal when fingerprint identification is carried out. A gating unit 150, wherein the input end of the gating unit 150 is electrically connected with the control unit, and the output end of the gating unit 150 is electrically connected with the light-emitting element 121; for conducting during fingerprint identification, the first data signal is transmitted to the portion of the light emitting elements 121 near the edge of the through hole 131, so that the portion of the light emitting elements 121 near the edge of the through hole 131 stops emitting light.
For example, fig. 2 is a schematic top view structure diagram of a display panel according to an embodiment of the present invention, as shown in fig. 2, an input end of a control unit 160 is electrically connected to the touch unit 140, an input end of a gating unit 150 is electrically connected to the control unit 160, and an output end of the gating unit 150 is electrically connected to the light emitting element 121. When a finger touches the display panel 100, the touch unit 140 generates a corresponding touch signal, and the display panel 100 starts to perform fingerprint recognition. During fingerprint identification, a touch signal generated by the touch unit 140 is transmitted to the control unit; the control unit receives a touch signal and generates a first data signal according to the touch signal; the gating unit 150 is turned on, the gating unit 150 can transmit the received first data signal to the portion of the light emitting elements 121 near the edge of the through hole 131, and the portion of the light emitting elements 121 near the edge of the through hole 131 stops emitting light after receiving the first data signal, so that the gating unit 150 can stop emitting light for the portion of the light emitting elements 121 near the edge of the through hole 131 during fingerprint recognition.
The light shielding layer 130 is positioned on one side of the light emitting element layer 120 close to the substrate 110, and a through hole 131 is arranged in a region corresponding to a gap between the light shielding layer 130 and two adjacent light emitting elements 121; the light beams reflected by the finger are received by the fingerprint identification units through the through hole 131, each fingerprint identification unit receives the light beams carrying the local fingerprint information to form a local fingerprint image, and the local fingerprint images acquired by all the fingerprint identification units are spliced to form a complete fingerprint image, so that the fingerprint image of the finger is acquired; and then matching the acquired fingerprint image with a pre-stored fingerprint image to generate a matching result.
During fingerprint identification, light emitted by the light emitting elements around the through hole is directly incident to the fingerprint identification unit through the through hole without being reflected by a finger, and light beams which are not reflected by the finger do not carry fingerprint information, so that the formation of a fingerprint image is not facilitated, and the light beams can be generally called as optical noise. Fig. 3 is a schematic diagram of diffraction of a through hole according to an embodiment of the present invention, as shown in fig. 3, a diameter of the through hole 131 is D, when there is a light emitting element above or around the through hole 131, scattered light of the light emitting element enters the through hole 131, and the through hole 131 has a relatively strong diffraction halo (a diagonal filling portion in the figure) around the through hole 131 due to a relatively small size of the through hole 131, so as to form optical noise, and thus the signal received by the fingerprint identification unit has relatively large noise, which causes relatively large noise of the formed fingerprint image, and affects the quality of the fingerprint image.
Fig. 4 is a schematic optical path diagram of a display panel according to an embodiment of the present invention, as shown in fig. 4, the first light emitting elements 121a are located near the edge of the through hole 131, and the light emitting elements other than the first light emitting elements 121a are all the second light emitting elements 121b, when fingerprint identification is performed, the first light emitting element 121a stops emitting light, the second light emitting element 121b emits light normally, since the second light emitting element 121b is far away from the through hole 131, the scattered light of the second light emitting element 121b is difficult to enter the through hole 131, only the light reflected and refracted by each film layer (as shown by the arrows in the figure) enters the through hole 131, but the intensity of the light is weak, about 5% -9% of the intensity of the light entered into the through-hole 131 when the first light emitting element 121a normally emits light, namely, the optical noise is reduced by 91% -95%, and the light hardly influences the quality of the fingerprint image. Therefore, the embodiment of the invention can avoid the situation that the light beam emitted by the light emitting element close to the edge of the through hole 131 directly enters the fingerprint identification unit without passing through a finger by controlling the light emitting element close to the edge of the through hole 131 to stop emitting light when fingerprint identification is carried out, reduce the signal quantity without carrying fingerprint information, namely reduce the noise received by the fingerprint identification unit, and improve the signal-to-noise ratio of the fingerprint signal, thereby reducing the noise of the fingerprint image and improving the quality of the fingerprint image.
In summary, in the technical solution provided by the embodiment of the present invention, the touch unit can acquire the touch signal; the control unit is electrically connected with the touch control unit through the control unit, and can generate a first data signal according to the received touch control signal when fingerprint identification is carried out; through the gating unit, the input end of the gating unit is electrically connected with the control unit, the output end of the gating unit is electrically connected with the light-emitting element, when fingerprint identification is carried out, the gating unit can transmit the first data signal to the part of the light-emitting element close to the edge of the through hole, so that the part of the light-emitting element close to the edge of the through hole stops emitting light, so that the part of the light-emitting element close to the edge of the through hole 131 stops emitting light, the condition that light beams emitted by the light-emitting element close to the edge of the through hole are not directly incident to the fingerprint identification unit through a finger is avoided, the signal quantity without carrying fingerprint information is reduced, namely, the noise received by the fingerprint identification unit is reduced, the signal-to-noise ratio of.
It should be noted that the light emitting element layer 120 includes a plurality of light emitting elements 121 arranged in an array, each light emitting element 121 includes an anode 121a, a light emitting function layer 121b, and a cathode 121c, which are stacked, the anode 121a is disposed on the side of the gating unit 150 away from the substrate base 110, the light emitting function layer 121b is disposed on the side of the anode 121a away from the substrate base 110, and the cathode 121c is disposed on the side of the light emitting function layer 121b away from the substrate base 110, as shown in fig. 1. When an electric field exists between the anode 121a and the cathode 121c, the light-emitting functional layer 121b receives excitation light by the electric field, and when an electric field does not exist between the anode 121a and the cathode 121c, the light-emitting functional layer 121b stops emitting light.
It should be noted that the touch unit 140 may be a self-contained touch unit or a mutual-contained touch unit, and the mutual-contained touch unit is taken as an example for description. The touch unit 140 includes a plurality of touch driving electrodes 141 and a plurality of touch sensing electrodes 142, the touch driving electrodes 141 are disposed on the side of the light emitting device layer 120 away from the substrate 110, and the touch sensing electrodes 142 can be disposed on the side of the touch driving electrodes 141 away from the substrate 110, as shown in fig. 1; the touch sensing electrode 142 may also be disposed on the side of the touch driving electrode 141 close to the substrate 110. When a finger touches the display panel 100, a capacitance may be formed between the touch driving electrode 141 and the touch sensing electrode 142, and the touch sensing electrode 142 generates a corresponding touch signal. The embodiment of the invention only exemplarily shows the different layer arrangement of the film layers of the plurality of touch driving electrodes 141 and the plurality of touch sensing electrodes 142. In other real-time methods, the touch driving electrodes 141 and the touch sensing electrodes 142 may be disposed in the same layer.
It should be further noted that the control unit 160 may be a driving chip, and with reference to fig. 1 and fig. 2, an input end of the control unit 160 is electrically connected to the touch sensing electrode 142 of the touch unit 140, and a touch signal generated by the touch sensing electrode 142 is transmitted to the control unit 160. Illustratively, the gating unit 150 includes a transistor including a gate 151, a source 152, and a drain 153, and the gate 151 may be a bottom gate structure, as shown in fig. 1; the gate 151 may have a top gate structure, the source 152 is electrically connected to the output terminal of the control unit, and the drain 153 is electrically connected to the anode 121 a.
Optionally, fig. 5 is a schematic top view structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 5, the light emitting element layer 120 includes a plurality of pixel units 1201; each pixel unit 1201 includes a plurality of light emitting elements 121 of different colors.
And a gating unit 150 for transmitting the first data signal to a portion of the pixel cells near the edge of the via 131 to stop the portion of the pixel cells near the edge of the via 131 from emitting light when performing fingerprint recognition.
Illustratively, as shown in fig. 5, each pixel unit 1201 includes three light emitting elements 121 of different colors, the three light emitting elements 121 respectively emit blue light, green light, and red light, and the three light emitting elements 121 collectively control the color displayed by one pixel unit 1201, thereby realizing display of different pictures. When fingerprint identification is performed, the gating unit 150 is turned on, the first data signal is transmitted to the whole pixel unit 1201, whether the whole pixel unit 1201 emits light or not is controlled by taking the pixel unit 1201 as a unit, and a part of the light emitting elements 121 in one pixel unit 1201 are prevented from emitting light and a part of the light emitting elements 121 do not emit light, so that color cast in a display area is avoided. The embodiment of the present invention merely illustrates the number of the light emitting elements 121 included in the pixel unit 1201, and the present application is not particularly limited thereto. Optionally, with continued reference to fig. 3, N pixel units 1201 are spaced between two adjacent through holes 131 along the row direction of the array and/or the column direction of the array, where N is greater than or equal to 5 and less than or equal to 15.
For clarity of illustrating the positions of the through holes 131, fig. 5 only exemplarily shows the light shielding layer 130 and the pixel unit 1201. As shown in fig. 5, the light emitting element layer 120 includes pixel units 1201 arranged in a 7 × 7 array, each pixel unit 1201 includes three light emitting elements 121 of different colors, the light shielding layer 130 includes 4 through holes 131, and two adjacent through holes 131 are spaced by 5 pixel units 1201 along the X direction; in the Y direction, two adjacent through holes 131 are spaced by 5 pixel units 1201. Fig. 5 is only exemplary and illustrates the number of pixel units 1201, the number of light emitting elements 121 included in each pixel unit 1201, and the number of pixel units 1201 spaced between two adjacent through holes 131, and is not intended to limit the embodiments of the present invention.
Specifically, the number N of pixel units 1201 spaced between two adjacent through holes 131 determines the number of partial fingerprint images, and therefore, the number N of pixel units 1201 spaced between two adjacent through holes 131 needs to be set reasonably. If the number N of the pixel units 1201 spaced between two adjacent through holes 131 is too large, for example, N >15, the number of the acquired local fingerprint images is small, the definition of the formed fingerprint images is poor, the fingerprint matching time is long, and the fingerprint identification efficiency is affected; if the number N of the pixel units 1201 spaced between two adjacent through holes 131 is too small, for example, N <5, the increase in the number of the acquired partial fingerprint images does not have too great an effect on the definition of the fingerprint images, but rather, the time for processing the partial fingerprint images to form the fingerprint images is long, which affects the efficiency of fingerprint identification. In summary, the value range of the number N of the pixel units 1201 spaced between two adjacent through holes 131 is set as: n is more than or equal to 5 and less than or equal to 15, so that the fingerprint image definition is better, the fingerprint matching time is shortened, the time for processing the local fingerprint image is shortened, and the fingerprint identification efficiency is improved.
It should be noted that, in the embodiment of the present invention, only the number N of the pixel units 1201 spaced between two adjacent through holes 131 when obtaining a fingerprint image with a higher definition, and the number N of the pixel units 1201 spaced between two adjacent through holes 131 when the definition of the fingerprint image does not change much are exemplarily described, and in practical applications, the number N of the pixel units 1201 spaced between two adjacent through holes 131 is flexibly set according to factors such as materials and processes.
Alternatively, with continued reference to fig. 5, the number of light emitting elements 121 spaced between two adjacent vias 131 is equal in the row direction of the array and in the column direction of the array.
Illustratively, as shown in fig. 5, two adjacent through holes 131 are spaced by 5 pixel units 1201 along the X direction; in the Y direction, two adjacent through holes 131 are spaced by 5 pixel units 1201. The number of the pixel units 1201 spaced between two adjacent through holes 131 in the X direction and the number of the pixel units 1201 spaced between two adjacent through holes 131 in the Y direction are set to be equal, so that the number of the acquired local fingerprint images in the X direction is equal to the number of the local fingerprint images in the Y direction, the number of the local fingerprint images can be increased, clearer fingerprint identification images are obtained, the fingerprint matching time is shortened, and the fingerprint identification efficiency is improved.
Optionally, with continued reference to fig. 5, the aperture D of the via 131 is less than or equal to 10 um.
Specifically, since the through hole 131 is disposed in a region of the light-shielding layer 130 corresponding to the gap between the adjacent light-emitting units 121, the aperture D of the through hole 131 is limited by the size of the gap between the adjacent light-emitting units 121. For example, when the aperture D of the through hole 131 is larger than 10um, the vertical projection of the through hole 131 on the substrate 110 is at least partially located outside the vertical projection of the gap of the light emitting element 121 on the substrate 110, so that at least part of the light reflected by the finger is blocked by the light emitting element 121, thereby losing part of the fingerprint signal and further affecting the definition of the fingerprint image. In summary, the value range of the aperture D of the through hole 131 is set as: d is less than or equal to 10um, can avoid light-emitting component 121 to the sheltering from of fingerprint signal, improve the definition of fingerprint image, reduce the noise of fingerprint image promptly to shorten the time of fingerprint matching, improve fingerprint identification's efficiency.
It should be noted that, the embodiment of the present invention only exemplifies the aperture D of the through hole 131 corresponding to the light emitting element 121 when the light emitting element 121 does not block the light reflected by the finger, and the aperture D of the through hole 131 is flexibly set according to the size of the gap between the adjacent light emitting units 121, the process, and other factors in practical application.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises any one of the display panels provided in the embodiments of the application.
Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 6, the display device 200 includes the display panel 100.
The display device 200 further includes: and the fingerprint sensor 210 is positioned on one side of the substrate base plate 110, which is far away from the light-emitting element layer 120, and is used for acquiring light reflected by the touch main body to perform fingerprint identification.
Specifically, as shown in fig. 6, the light-sensing surfaces of the fingerprint sensors 210 face the through holes 131, each through hole 131 corresponds to one fingerprint sensor 210 (the number of the real fingerprint sensors is not represented in the figure, and is only illustrated), and the fingerprint sensors 210 are used for acquiring the light passing through the corresponding through holes. The fingerprint identification process is generally divided into two phases: in the first stage, when a finger touches the display panel, the surface of the finger can reflect light beams, the reflected light beams pass through a plurality of through holes and are received by the fingerprint sensors 210 corresponding to the through holes (the arrows in the figure indicate the transmission direction of the light beams), each fingerprint sensor 210 can receive partial fingerprint information and form a partial fingerprint image, and all the partial fingerprint images are spliced to form a complete fingerprint image so as to obtain the fingerprint image of the finger; and in the second stage, matching the acquired fingerprint image with a pre-stored fingerprint image and generating a matching result.
The display device 200 provided in the embodiment of the invention has the advantages of the display panel 100 in the above embodiments, and details are not repeated herein. In a specific implementation, the display device 200 may be a mobile phone, a tablet computer, a notebook computer, or any product or component with a display function and a fingerprint identification function, such as a television, a digital photo frame, a navigator, an intelligent wearable display device, and the like, which is not limited in this embodiment of the present invention.
Based on the same inventive concept, the embodiment of the invention also provides a control method of the display panel, which is suitable for any display panel provided in the embodiment of the invention.
Fig. 7 is a schematic flowchart of a control method of a display panel according to an embodiment of the present invention, and as shown in fig. 7, the specific steps of the control method of the display panel include:
s110, the touch unit acquires a touch signal.
And S120, generating a first data signal according to the touch signal when the control unit performs fingerprint identification.
And S130, the gating unit is conducted when fingerprint identification is carried out, and the first data signal is transmitted to the part of the light-emitting elements close to the edge of the through hole, so that the part of the light-emitting elements close to the edge of the through hole stops emitting light.
Specifically, when a finger touches the display panel, the touch unit can generate a corresponding touch signal according to the generated capacitance, the control unit generates a first data signal after receiving the touch signal, the gating unit receives the first data signal, and the gating unit conducts and transmits the first data signal to a part of the light-emitting elements close to the edge of the through hole. So that the light emitting element near the edge of the through hole emits light, for example, when the first data signal is a low level signal, the light emitting element stops emitting light.
According to the technical scheme provided by the embodiment of the invention, the touch control signal can be obtained through the touch control unit, the control unit can generate the first data signal according to the received touch control signal when fingerprint identification is carried out, and the gating unit can transmit the first data signal to the part of the light-emitting elements close to the edge of the through hole by turning on the gating unit when the fingerprint identification is carried out, so that the part of the light-emitting elements close to the edge of the through hole stops emitting light. So, can control the partial light emitting component that is close to the through-hole edge and stop luminous, avoid being close to the light emitting component at through-hole edge and send the light beam and do not pass through the condition that the finger directly incides to the fingerprint identification unit, reduce the semaphore that does not carry fingerprint information, reduce the received noise of fingerprint identification unit promptly, improve fingerprint signal's SNR to reduce the noise of fingerprint image, improve the quality of fingerprint image.
In the display panel, the light emitting layer includes a plurality of pixel units, and each pixel unit includes a plurality of light emitting elements of different colors. Fig. 8 is a schematic flowchart of a control method of a display panel according to an embodiment of the present invention, and as shown in fig. 8, the specific steps of the control method of the display panel include:
s110, the touch unit acquires a touch signal.
And S120, generating a first data signal according to the touch signal when the control unit performs fingerprint identification.
And S140, the gating unit is conducted when fingerprint identification is carried out, and the first data signal is transmitted to the part of the pixel units close to the edge of the through hole, so that the part of the pixel units close to the edge of the through hole stops emitting light.
Specifically, when fingerprint identification is performed, the gating unit is turned on, the first data signal is transmitted to the whole pixel unit, whether the whole pixel unit emits light or not is controlled by taking the pixel unit as a unit, and partial light-emitting elements in one pixel unit are prevented from emitting light and partial light-emitting elements do not emit light, so that color cast in a display area is avoided.
Fig. 9 is a schematic flowchart of a control method for a display panel according to another embodiment of the present invention, and as shown in fig. 9, the control method for a display panel includes the following specific steps:
s110, the touch unit acquires a touch signal.
And S120, generating a first data signal according to the touch signal when the control unit performs fingerprint identification.
S150, the gating unit is conducted when fingerprint identification is carried out, the first data signals are transmitted to part of the light-emitting elements at the edge of the through hole, m light-emitting elements are spaced between the through hole and the boundary of the dark area along the row direction of the array and/or the column direction of the array, and m satisfies 1/3 ≤ m/n ≤ 2/3.
Wherein the light emitting element which stops emitting light forms the dark region around the via hole; and n light-emitting elements are arranged between two adjacent through holes along the row direction of the array and/or the column direction of the array at intervals.
Specifically, fig. 10 is a schematic structural diagram of a display panel during fingerprint identification according to an embodiment of the present invention, as shown in fig. 10, n light emitting elements 121 are spaced between two adjacent through holes 131 along an X direction and/or along a Y direction, each light emitting element 121 includes a first light emitting element 121a and a second light emitting element 121b, where the first light emitting element 121a stops emitting light during fingerprint identification, the second light emitting element 121b normally emits light during fingerprint identification, the first light emitting element 121a around each through hole 131 forms a dark area DZ, and m first light emitting elements 121a are spaced between the through hole 131 and a side of the corresponding dark area DZ along the X direction and/or along the Y direction.
In the fingerprint recognition process, the shorter the distance between the second light emitting element 121b and the through hole 131 is, the more signals which do not carry fingerprint information and enter the through hole 131 are, the higher the noise of the fingerprint image is, therefore, the number of the first light emitting elements 121a spaced between the through hole 131 and the corresponding side of the dark zone DZ determines the noise of the fingerprint image, and it can also be considered that the ratio m/n of the number m of the first light emitting elements 121a spaced between the through hole 131 and the corresponding side of the dark zone DZ to the number n of the light emitting elements 121 spaced between two adjacent through holes determines the noise of the fingerprint image. If m/n is too small at the time of fingerprint recognition, for example, m/n <1/3, the number of the first light emitting elements 121a is small, and the noise ratio through the through holes is large, resulting in large noise of the fingerprint image, affecting the quality of the fingerprint image; if m/n is too large, for example, m/n >2/3, during fingerprint recognition, the number of the first light emitting elements 121a has too large influence on the noise passing through the through-hole, and may adversely affect the light intensity of the light beam irradiating the finger, resulting in a small intensity of fingerprint signal and affecting the quality of fingerprint image. In summary, the value range of the ratio of the number m of the first light emitting elements 121a spaced between the through hole 131 and the corresponding dark space DZ and the number n of the light emitting elements 121 spaced between two adjacent through holes is set as: m/n is not less than 1/3 and not more than 2/3, so that the noise of the fingerprint image can be reduced, a stronger fingerprint signal can be acquired, and the quality of the fingerprint image is improved, thereby shortening the fingerprint matching time and improving the fingerprint identification efficiency.
It should be noted that, in the embodiment of the present invention, only the ratio m/n between the number m of the first light emitting elements 121a spaced between the corresponding through hole 131 and the corresponding side of the dark space DZ when the fingerprint image with small noise is obtained and the number n of the light emitting elements spaced between two adjacent through holes, and the ratio m/n between the number m of the first light emitting elements 121 spaced between the corresponding through hole 131 and the corresponding side of the dark space DZ and the number n of the light emitting elements 121 spaced between two adjacent through holes when the noise of the fingerprint image does not change much are exemplarily described, in practical application, the ratio m/n between the number m of the first light emitting elements 121a spaced between the through hole 131 and the corresponding side of the dark space DZ and the number m of the light emitting elements 121 spaced between two adjacent through holes can be flexibly set.
Optionally, fig. 11 is a schematic flowchart of a control method of a display panel according to another embodiment of the present invention, and as shown in fig. 11, the specific steps of the control method of the display panel include:
s110, the touch unit acquires a touch signal.
And S120, generating a first data signal according to the touch signal when the control unit performs fingerprint identification.
S160, the gating unit is conducted when fingerprint identification is carried out, the first data signals are transmitted to the part of the light-emitting elements close to the edge of the through hole, so that m light-emitting elements are spaced between the through hole and the boundary of the dark area along the row direction of the array and/or the column direction of the array, and m satisfies 1/3 ≦ m/n ≦ 2/3, so that the number of the light-emitting elements spaced between the through hole and the boundary of the dark area along the row direction of the array and the column direction of the array is equal.
Wherein the light emitting element which stops emitting light forms the dark region around the via hole; and n light-emitting elements are arranged between two adjacent through holes along the row direction of the array and/or the column direction of the array at intervals.
Specifically, as shown in fig. 10, the number of the first light emitting elements 121a spaced between the X-direction through hole 131 and the corresponding side of the dark space DZ is equal to the number of the first light emitting elements 121a spaced between the Y-direction through hole 131 and the corresponding side of the dark space DZ, so that the noise of the acquired local fingerprint image along the X-direction is approximately equal to the noise of the local fingerprint image along the Y-direction, and the noise of the local fingerprint image can be reduced, so that the noise of the fingerprint image can be reduced, the quality of the fingerprint image can be improved, the fingerprint matching time can be shortened, and the fingerprint identification efficiency can be improved.
Optionally, on the basis of the foregoing embodiment, the method for controlling a display panel further includes:
and S170, generating a second data signal according to the touch signal when the control unit performs fingerprint identification.
And S180, the gating unit is conducted when fingerprint identification is carried out, and the second data signal is transmitted to the light-emitting elements outside the dark area, so that the light-emitting elements outside the dark area can normally emit light.
Specifically, the control unit generates a second data signal after receiving the touch signal, the gating unit comprises a first gating unit and a second gating unit, the input end of the first gating unit is electrically connected with the first data signal, and the output end of the first gating unit is electrically connected with the light-emitting element which stops emitting light during fingerprint identification; the input end of the second gating unit is electrically connected with the second data signal, and the output end of the second gating unit is electrically connected with the light-emitting element which normally emits light during fingerprint identification. The second gating unit transmits the second data signal to the light-emitting elements outside the dark area, and the light-emitting elements outside the dark area normally emit light after receiving the second data signal, so that the light-emitting elements can be controlled to normally emit light, and normal display of pictures in the area outside the fingerprint identification area is realized.
The foregoing is considered as illustrative of the preferred embodiments of the invention and technical principles employed. The present invention is not limited to the specific embodiments herein, and it will be apparent to those skilled in the art that various changes, rearrangements, and substitutions can be made without departing from the scope of the invention. Therefore, although the present invention has been described in more detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the claims.
Claims (12)
1. A display panel, comprising:
a substrate base plate;
a light emitting element layer on one side of the substrate base plate; the light emitting element layer comprises a plurality of light emitting elements arranged in an array;
a light-shielding layer; the light shielding layer comprises a plurality of through holes; the vertical projection of the through hole on the substrate base plate is positioned in the vertical projection of the gap between the adjacent light-emitting elements on the substrate base plate;
the touch control unit is used for acquiring a touch control signal;
the control unit is electrically connected with the touch control unit; the touch control device is used for generating a touch control signal according to a touch control signal when fingerprint identification is carried out;
the input end of the gating unit is electrically connected with the control unit, and the output end of the gating unit is electrically connected with the light-emitting element; the light emitting element is used for conducting during fingerprint identification, transmitting the first data signal to a part of the light emitting elements close to the edge of the through hole, and enabling the part of the light emitting elements close to the edge of the through hole to stop emitting light.
2. The display panel according to claim 1, wherein the light-emitting element layer comprises a plurality of pixel units; each of the pixel units includes a plurality of light emitting elements of different colors;
the gating unit is used for conducting when fingerprint identification is carried out, and transmitting the first data signal to the part of the pixel units close to the edge of the through hole so as to enable the part of the pixel units close to the edge of the through hole to stop emitting light.
3. The display panel according to claim 2, wherein N pixel units are arranged between two adjacent through holes along the row direction of the array and/or the column direction of the array, and N is greater than or equal to 5 and less than or equal to 15.
4. The display panel according to claim 1, wherein the number of the light emitting elements spaced between adjacent two of the through holes is equal in a row direction of the array and a column direction of the array.
5. The display panel according to claim 1, wherein the aperture of the through hole is less than or equal to 10 um.
6. A display device characterized by comprising the display panel according to any one of claims 1 to 5.
7. The display device according to claim 6, further comprising: a fingerprint sensor;
the fingerprint sensor is located on one side, away from the light-emitting element layer, of the substrate base plate and used for acquiring light reflected by the touch main body to conduct fingerprint identification.
8. A method for controlling a display panel, the method being applied to the display panel according to any one of claims 1 to 5, the method comprising:
the touch control unit acquires a touch control signal;
the control unit generates a first data signal according to the touch signal when fingerprint identification is carried out;
the gating unit is conducted when fingerprint identification is carried out, and the first data signal is transmitted to a part of light-emitting elements close to the edge of the through hole, so that the part of the light-emitting elements close to the edge of the through hole stops emitting light.
9. The method according to claim 8, wherein the light-emitting element layer includes a plurality of pixel units; each of the pixel units includes a plurality of light emitting elements of different colors;
the transmitting the first data signal to a portion of the light emitting elements near an edge of a via hole to cause the portion of the light emitting elements near the edge of the via hole to stop emitting light includes:
and transmitting the first data signal to a part of the pixel units close to the edge of the through hole so as to stop the part of the pixel units close to the edge of the through hole from emitting light.
10. The method of claim 8, wherein the portion of the light emitting elements near the edge of the via ceases to emit light comprises:
m light-emitting elements are spaced between the boundaries of the through holes and the dark regions along the row direction of the array and/or the column direction of the array, and m satisfies 1/3-m/n-2/3;
wherein the light emitting element which stops emitting light forms the dark region around the via hole; and n light-emitting elements are arranged between two adjacent through holes along the row direction of the array and/or the column direction of the array at intervals.
11. The method of claim 10, wherein the portion of the light emitting elements near the edge of the via ceases to emit light, further comprising:
the number of the light emitting elements spaced between the through holes and the boundary of the dark region is equal in a row direction of the array and a column direction of the array.
12. The method of claim 10, further comprising:
the control unit generates a second data signal according to the touch signal when fingerprint identification is carried out;
the gating unit is conducted when fingerprint identification is carried out, and the second data signal is transmitted to the light-emitting elements outside the dark area, so that the light-emitting elements outside the dark area can normally emit light.
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