CN106971181B - Display panel and display device - Google Patents

Display panel and display device Download PDF

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Publication number
CN106971181B
CN106971181B CN201710391355.1A CN201710391355A CN106971181B CN 106971181 B CN106971181 B CN 106971181B CN 201710391355 A CN201710391355 A CN 201710391355A CN 106971181 B CN106971181 B CN 106971181B
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China
Prior art keywords
fingerprint identification
light
display panel
identification unit
light emitting
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CN201710391355.1A
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CN106971181A (en
Inventor
曾洋
张卿
王丽花
谢亮
杜凌霄
丁洪
柴慧平
杨康
姚绮君
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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Priority to CN201710391355.1A priority Critical patent/CN106971181B/en
Publication of CN106971181A publication Critical patent/CN106971181A/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K9/00Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
    • G06K9/00006Acquiring or recognising fingerprints or palmprints
    • G06K9/00013Image acquisition
    • G06K9/00046Image acquisition by using geometrical optics, e.g. using prisms

Abstract

The embodiment of the invention discloses a display panel and a display device. The display panel includes: the array substrate comprises a first substrate and a plurality of light emitting units positioned on the first substrate; the plurality of light emitting units are sequentially arranged along a first direction, the light emitting units have a first size along the first direction and a second size along a second direction, the first size is smaller than the second size, and the first direction and the second direction are intersected with each other; the fingerprint identification unit is positioned on one side, far away from the first substrate, of the light emitting unit; the vertical projection of the fingerprint identification unit on the array substrate is positioned between two adjacent rows of light emitting units arranged along the first direction. The embodiment of the invention improves the screen occupation ratio of the display panel and improves the user experience.

Description

Display panel and display device
Technical Field
The present invention relates to display technologies, and in particular, to a display panel and a display device.
Background
Fingerprints are unique to each individual. With the development of science and technology, a variety of display devices with fingerprint identification functions appear in the market, such as mobile phones, tablet computers, intelligent wearable devices and the like. Therefore, before the user operates the display device with the fingerprint identification function, the user only needs to touch the fingerprint identification unit of the display device with a finger to carry out authority identification, and the authority identification process is simplified.
In the conventional display device with the fingerprint identification function, the fingerprint identification unit is often arranged in a non-display area of the display panel. For the display panel with the structure, in order to verify the authority, a user needs to touch the fingerprint identification module specially, and the user experience is influenced. In addition, the fingerprint identification unit is arranged in the non-display area of the display panel, so that the screen occupation ratio is reduced, and the development trend of the narrow edge of the display panel is contrary to.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for improving the screen occupation ratio of the display panel and improving the user experience.
In a first aspect, an embodiment of the present invention provides a display panel, where the display panel includes:
the array substrate comprises a first substrate and a plurality of light emitting units positioned on the first substrate; the plurality of light emitting units are sequentially arranged along a first direction, the light emitting units have a first size along the first direction and a second size along a second direction, the first size is smaller than the second size, and the first direction and the second direction are intersected with each other;
the fingerprint identification unit is positioned on one side, far away from the first substrate, of the light emitting unit; the vertical projection of the fingerprint identification unit on the array substrate is positioned between two adjacent rows of light emitting units arranged along the first direction.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes the display panel according to any embodiment of the present invention.
The embodiment of the invention has the advantages that the vertical projection of the fingerprint identification unit on the array substrate is arranged between the two adjacent rows of the light-emitting units which are arranged along the first direction, so that the fingerprint identification unit can be arranged in the display area of the display panel, the screen occupation ratio of the display panel is improved, the development trend of the narrow edge of the display panel is conformed, the area of the non-light-emitting area between the two adjacent rows of the light-emitting units which are arranged along the first direction is limited, the size of the fingerprint identification unit arranged between the two adjacent rows of the light-emitting units which are arranged along the first direction along the second direction is smaller than the second size of the fingerprint identification unit of the light-emitting unit, when the visual angle is larger, the shielding area of the projection of the fingerprint identification unit to the adjacent light-emitting unit is smaller than the total area of the light-emitting units, namely, the display characteristic of the display panel has smaller influence, the user experience is improved.
Drawings
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the display panel of FIG. 1 along the sectional line A-A;
FIG. 3 is a schematic plan view of a display panel according to a comparative example of the present invention;
FIG. 4 is a graph illustrating the effect of fingerprint identification unit position on viewing angle according to an embodiment of the present invention;
FIG. 5 is a schematic plan view of another display panel provided in an embodiment of the present invention;
FIG. 6 is a schematic plan view of another display panel provided in an embodiment of the present invention;
FIG. 7 is a schematic plan view of another display panel provided in an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
fig. 9 is a schematic cross-sectional view illustrating a display panel according to another embodiment of the invention;
FIG. 10 is a schematic structural diagram of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a film layer of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 12 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 13 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention, fig. 2 is a schematic cross-sectional view of the display panel shown in fig. 1 along a sectional line a-a, and referring to fig. 1 and fig. 2, the display panel includes:
the array substrate 10, the array substrate 10 includes a first substrate 110 and a plurality of light emitting units 120 located on the first substrate 110; the plurality of light emitting cells 120 are sequentially arranged along a first direction X, the light emitting cells 120 have a first dimension X1 along the first direction X and a second dimension Y1 along a second direction Y, the first dimension X1 is smaller than the second dimension Y1, wherein the first direction X and the second direction Y intersect with each other;
the fingerprint identification unit 20, the fingerprint identification unit 20 is located on one side of the light emitting unit 120 far away from the first substrate 110; the vertical projection of the fingerprint identification unit 20 on the array substrate 10 is located between two adjacent rows of the light emitting units 120 arranged along the first direction X.
Specifically, the area corresponding to the light emitting unit 120 is a light emitting area of the display panel, and the area between two adjacent rows of the light emitting units 120 is a non-light emitting area. In the embodiment, the fingerprint identification unit 20 is disposed between two adjacent rows of light emitting units 120 arranged along the first direction X in the vertical projection of the array substrate 10, that is, in the non-light emitting area of the display panel, so that the fingerprint identification unit 20 can be disposed in the display area of the display panel, the screen occupation ratio of the display panel is improved, and the development trend of the narrow edge of the display panel is complied with.
Referring to fig. 1, since the fingerprint identification unit 20 is located on a side of the light emitting unit 120 away from the first substrate 110, that is, the fingerprint identification unit 20 is closer to the user observation surface than the light emitting unit 120, a dotted frame 20a is a projection of the fingerprint identification unit 20 when the user observation angle is larger, and it can be seen from fig. 1 that when the user observation angle is larger, the fingerprint identification unit 20 blocks the light emitting unit 120, which affects image display. Specifically, because the area of the non-light-emitting area between two adjacent rows of light-emitting units 120 arranged along the first direction X is limited, the size m of the fingerprint identification unit 20 arranged between two adjacent rows of light-emitting units 120 arranged along the first direction X along the second direction Y is smaller than the second size Y1 of the light-emitting unit 120, when the viewing angle is larger, the shielding area of the projection 20a of the fingerprint identification unit 20 to the adjacent light-emitting unit 120 is smaller than the total area of the light-emitting units 120, so that the display characteristics of the display panel are less affected, the display panel has a larger visual angle, and the user experience is improved.
Fig. 3 is a schematic plan view of a display panel according to a comparative example of the present invention, and referring to fig. 3, a vertical projection of the fingerprint identification unit 20 in fig. 3 on the array substrate 10 is located between two adjacent rows of light emitting units 120 arranged along the second direction Y. As can be seen from fig. 3, when the vertical projection of the fingerprint identification unit 20 on the array substrate 10 is located between two adjacent rows of light emitting units 120 arranged along the second direction Y, when the observation angle of view of the user is large, the projection 20a of the fingerprint identification unit 20 also shields the light emitting units 120, which affects the image display.
The inventors compared the shielding of the light emitting unit 120 by the fingerprint identification unit 20 in fig. 1 and 3 through experiments and calculations. Fig. 4 is a graph illustrating the effect of the position of the fingerprint identification unit on the viewing angle, where the ordinate in fig. 4 represents the ratio S of the unobstructed area of the light-emitting unit 120 adjacent to one edge of the fingerprint identification unit 20 to the total area of the light-emitting units 120 adjacent to the edge, and the abscissa represents the viewing angle of the display panel observed by the user. Referring to fig. 1, the fingerprint recognition unit 20 blocks three light-emitting units 120 adjacent to the lower edge, and S represents the ratio of the area of the three light-emitting units 120 that is not blocked to the total area of the three light-emitting units 120. The visual angle is an included angle between the sight of the user and a perpendicular line of an observation surface of the display panel when the user observes the display panel.
Specifically, referring to fig. 4, a curve E represents the shielding of the light-emitting unit 120 by the fingerprint identification unit 20 when the position and size of the fingerprint identification unit 20 are consistent with those of fig. 1, wherein the size m of the fingerprint identification unit 20 in the second direction Y in fig. 1 is 20 μm, and the size n in the first direction X is 45 μm. The curve F shows the shielding of the light-emitting unit 120 by the fingerprint identification unit 20 when the position and size of the fingerprint identification unit 20 are consistent with those of fig. 3, wherein the size p of the fingerprint identification unit 20 in the second direction Y in fig. 3 is 60 μm, and the size q in the first direction X is 15 μm. In addition, the light emitting units 120 in fig. 1 and 3 are arranged in the same manner, and the second dimensions Y1 of the light emitting units 120 along the second direction Y are all 40 μm, the first dimensions X1 along the first direction X are all 10 μm, the horizontal distances d between the edge of the fingerprint identification unit 20 and the edge of the adjacent light emitting unit 120 are all 3 μm, and referring to fig. 2, the vertical distances h from the plane where the fingerprint identification unit 20 is located to the light emitting surface of the light emitting unit 120 in fig. 1 and 3 are all 6 μm. Referring to fig. 4, when the viewing angle is small, the projections 20a of the fingerprint identification unit 20 are all located in the non-light emitting area of the display panel, and do not affect the display; when the viewing angle is large, the projection 20a of the fingerprint identification unit 20 covers a partial area of the light emitting unit 120, and blocks the light emitting unit 30 from emitting light, and as the viewing angle increases, the blocking area of the light emitting unit by the fingerprint identification unit 20 in fig. 1 is significantly smaller than the blocking area of the light emitting unit 120 by the fingerprint identification unit 20 in fig. 3.
Specifically, referring to fig. 1, when the vertical projection of the fingerprint identification unit 20 on the array substrate 10 is located between two adjacent rows of the light emitting units 120 arranged along the first direction X under a larger viewing angle, since the dimension m of the fingerprint identification unit 20 along the second direction is smaller than the dimension y1 of the light emitting units 120 along the second direction, the projection 20a of the fingerprint identification unit 20 will block a partial area of the light emitting units 120, but the ratio of the blocked area to the total area is limited, i.e. the brightness of the display panel decreases limitedly. Referring to fig. 3, when the vertical projection of the fingerprint identification unit 20 on the array substrate 10 is located between two adjacent rows of the light emitting units 120 arranged along the second direction Y, since the size q of the fingerprint identification unit 20 along the first direction is not much different from the size x1 of the light emitting units 120 along the first direction, or q is greater than x1, the area of the light emitting unit 120 covered by the projection 20a of the fingerprint identification unit 20 in the same viewing angle is larger than the total area of the light emitting units 120, and may completely cover the light emitting units 120 adjacent to the fingerprint identification unit 20, thereby affecting the image display of the display panel. It can be seen that the arrangement of the fingerprint recognition unit 20 in fig. 1 of the present invention is significantly better than that of the comparative example. Therefore, in the present embodiment, the plurality of light emitting units 120 are sequentially arranged along the first direction X, the first size X1 of the light emitting units 120 along the first direction X is smaller than the second size Y1 along the second direction Y, and the vertical projection of the fingerprint identification unit 20 on the array substrate 10 is located between two adjacent rows of light emitting units 120 arranged along the first direction X, so that when the observation angle of view of the user is large, the fingerprint identification unit 20 has a small influence on the display characteristics of the display panel, so that the display panel has a large visual angle, and the user experience is improved.
It should be noted that, in this embodiment, in order to ensure that the fingerprint identification units 20 in fig. 1 and 3 have the same area and the light emitting units 120 have the same arrangement and size, the sizes m, n, q, and p of the fingerprint identification units 20 and the first size x1 and the second size y1 of the light emitting units 120 are only exemplarily set, and are not limited to the present invention, and may be specifically set according to the resolution of the display panel and the like in other embodiments. In addition, the vertical distance h from the plane where the fingerprint identification unit 20 is disposed to the light exit surface of the light emitting unit 120 is only exemplary in this embodiment, and is not a limitation to the present invention, and may be set according to the specific position of the fingerprint identification unit 20 in other embodiments. In addition, in the present embodiment, the viewing angle used in fig. 1 is a viewing angle when viewed in a direction parallel to the Y direction, and the viewing angle used in fig. 3 is a viewing angle when viewed in a direction parallel to the X direction, but viewing angles in both directions are also important for the display panel.
Optionally, the ratio of the second dimension y1 to the first dimension x1 is greater than or equal to 2: 1.
Specifically, referring to fig. 1, the larger the ratio of the second dimension y1 to the first dimension x1, the more slender the shape of the light emitting unit 120 is, and the smaller the area of the light emitting unit 120 covered by the projection 20a of the fingerprint identification unit 20 occupies the total area of the light emitting unit 120 at a large viewing angle, so that the display characteristics of the display panel at a large viewing angle are better. By setting the ratio of the second size y1 to the first size x1 to be greater than or equal to 2:1, the light-emitting unit 120 is ensured to have a slender shape, the display characteristics of the display panel at a large viewing angle are improved, and the user experience is improved.
It should be noted that, a specific ratio of the second size y1 to the first size x1 may be set according to specific requirements, such as resolution of the display panel, and may be set as 3: 1 or 4:1, etc., for example, the first dimension x1 is 10 μm and the second dimension y1 is 40 μm each.
Fig. 5 is a schematic plan view of another display panel provided in an embodiment of the present invention, and alternatively, referring to fig. 1 and 5, the shape of a vertical projection of the light emitting unit 120 on the first substrate 110 is rectangular or elliptical. Set up like this, the second size y1 of having guaranteed light-emitting unit 120 is greater than first size X1 for when fingerprint identification unit 20 was located between two adjacent lines of light-emitting unit 120 of arranging along first direction X at array substrate 10's vertical projection, the proportion of the total area of light-emitting unit 120 that fingerprint identification unit 20 projection when big visual angle sheltered from was less, and it is less to display panel's image display influence, and the big visual angle characteristic of improvement display panel promotes user experience. The shape of the vertical projection of the light emitting unit 120 on the first substrate 110 may be a polygon, and is not particularly limited.
Fig. 6 is a schematic plan view of another display panel provided in an embodiment of the present invention, and alternatively, referring to fig. 5 and 6, the vertical projection of the fingerprint identification unit 20 on the array substrate 10 has a rectangular or elliptical shape.
Specifically, as the larger the area of the fingerprint identification unit 20 is, the larger the light receiving area thereof for receiving the reflected fingerprint light is, the stronger the received fingerprint reflected light signal is, and the area of the non-light emitting area of the display panel is limited, by setting the shape of the vertical projection of the fingerprint identification unit 20 on the array substrate 10 to be rectangular or elliptical, the fingerprint identification unit 20 can more fully utilize the area of the non-light emitting area, so that the fingerprint identification unit 20 has a larger light receiving area, thereby improving the fingerprint identification accuracy.
It should be noted that, in this embodiment, the case where the fingerprint identification unit 20 is rectangular or oval is shown only by way of example, and the present invention is not limited thereto, and in other embodiments, the shape of the fingerprint identification unit 20 may be set according to the area, shape, and the like of the non-light-emitting region between two adjacent rows of the light-emitting units 120 arranged along the first direction X. Fig. 7 is a schematic plan view of another display panel according to an embodiment of the present invention, and referring to fig. 7, the fingerprint identification unit 20 is a polygon such as a hexagon in a vertical projection on the array substrate 10.
Fig. 8 is a schematic cross-sectional view of another display panel provided in an embodiment of the invention, and optionally, referring to fig. 8, the light emitting unit 120 includes a first electrode 121, a light emitting layer 122, and a second electrode 123; the light emitting layer 122 is disposed between the first electrode 121 and the second electrode 122;
the array substrate 10 further includes a pixel defining layer 130; the pixel defining layer 130 has an opening area in which the light emitting unit 120 is located; the vertical projection of the fingerprint identification unit 20 on the array substrate 10 is located at a non-opening region of the pixel defining layer 130.
Specifically, the first electrode 121 may be an anode, the second electrode 123 may be a cathode, and the light-emitting layer 122 may be a red light-emitting layer, a green light-emitting layer, a blue light-emitting layer, or the like. Since the first substrate 110 is further fabricated with a driving circuit (not shown in fig. 8) for driving the light emitting units 120, the pixel defining layer 130 is used for covering the driving circuit and the like to planarize the first substrate 110, and is used for defining the light emitting area and the non-light emitting area of the array substrate 10, that is, defining each light emitting unit 120. The opening area of the pixel defining layer 130 is a light emitting area of the array substrate 10, and the non-opening area is a non-light emitting area of the array substrate 10. The vertical projection of the fingerprint identification unit 20 on the array substrate 10 is located in the non-light-emitting area of the array substrate 10, so that the fingerprint identification unit 20 can be arranged in the display area of the display panel, the screen occupation ratio of the display panel is improved, and the development trend of narrow edge of the display panel is met.
Alternatively, referring to fig. 8, the display panel further includes:
the encapsulating layer 40, the encapsulating layer 40 is located on one side of the plurality of light emitting units 120 away from the first substrate 110;
the fingerprint identification unit 20 is disposed on the encapsulation layer 40.
Specifically, by arranging the fingerprint identification unit 20 on the packaging layer 40, the fingerprint identification unit 20 is closer to the touch subject (finger), the propagation path of the light reflected by the touch subject from the touch subject to the fingerprint identification unit 20 is shorter, the loss of the light is less, the light can enter the fingerprint identification unit 20 more, and the fingerprint identification accuracy is improved. In addition, since the encapsulation layer 40 is located on the light emitting side of the display panel, the fingerprint identification unit 20 is located in the non-light emitting area of the array substrate 10 by setting the vertical projection of the fingerprint identification unit 20 on the array substrate 10, so that the fingerprint identification unit 20 does not block the light emitted by the light emitting unit 120, and the influence on the viewing angle of the display panel is reduced.
Optionally, the encapsulation layer 40 is a transparent rigid cover 40a, and the fingerprint identification unit 20 is disposed on a side of the transparent rigid cover 40a adjacent to the array substrate 10.
Specifically, the transparent rigid cover 40a is aligned and attached to the array substrate 10 after the fabrication, so the fingerprint identification unit 20 can be directly fabricated on the surface of the transparent rigid cover 40 a. Because the area between the transparent rigid cover plate 40a and the array substrate 10 is filled with air or nitrogen, the fingerprint identification unit 20 is disposed on one side of the transparent rigid cover plate 40a close to the array substrate 10, so that the thickness of the display panel is not increased by the fingerprint identification unit 20, and the development trend of the display panel is met.
Fig. 9 is a schematic cross-sectional view of another display panel according to an embodiment of the invention, and optionally, referring to fig. 9, the sealing layer 40 is a thin film sealing layer 40b, and the fingerprint identification unit 20 is disposed on a side of the thin film sealing layer 40b away from the array substrate 10.
Specifically, the thin film encapsulation layer 40b may include a plurality of organic layers and inorganic layers disposed at intervals, and both the side of the thin film encapsulation layer 40b close to the array substrate 10 and the side of the thin film encapsulation layer far from the array substrate 10 are inorganic layers, so as to better realize the water and oxygen blocking effects. In addition, if the temperature of the manufacturing process of the fingerprint identification unit 20 is low, the manufacturing process does not affect other film layers of the display panel, and the fingerprint identification unit 20 may be directly manufactured on the surface of the thin film encapsulation layer 40 b. If the temperature of the manufacturing process of the fingerprint identification unit 20 is high and may affect the light emitting unit 120 during the manufacturing process, the fingerprint identification unit 20 may be manufactured on a substrate and attached to the thin film encapsulation layer 40b after the manufacturing process is completed.
FIG. 10 is a schematic structural diagram of a fingerprint identification unit according to an embodiment of the present invention; fig. 11 is a schematic diagram of a film layer of a fingerprint identification unit according to an embodiment of the present invention. Alternatively, referring to fig. 10 and 11, the fingerprint recognition unit includes a photodiode D, a storage capacitor C, and a thin film transistor T;
the anode D1 of the photodiode D is electrically connected with the first electrode of the storage capacitor C, and the cathode D2 of the photodiode D is electrically connected with the second electrode of the storage capacitor C and the source Ts of the thin film transistor T; a grid electrode Tg of the thin film transistor T is electrically connected with a switch control line Gate, and a drain electrode Td is electrically connected with a signal detection line Data;
the photodiode D is used to convert light reflected by the touch subject into a current signal.
Optionally, the photodiode D includes a PIN junction D3 between the anode D1 and the cathode D2; the vertical projection of the PIN junction D3 on the array substrate 10 is located in the light-transmitting area of the array substrate 10. Among them, the PIN junction D3 is composed of a P-type semiconductor, an N-type semiconductor, and an intrinsic semiconductor (I-type layer) between the P-type semiconductor and the N-type semiconductor. Specifically, the cathode D2 is formed of opaque metal, and the boundary of the PIN junction D3 does not exceed the boundary of the cathode D2. The anode D1 of the photodiode D is located on the side of the PIN junction D3 away from the array substrate 10. PIN junction D3 has photosensitive properties and has unidirectional conductivity. In the absence of illumination, the PIN junction D3 has a small saturation reverse leakage current, i.e., dark current, when the photodiode D is turned off. When the PIN junction D3 is illuminated, the saturation reverse leakage current of the PIN junction D3 is greatly increased, and a photocurrent is formed and changes along with the change of the incident light intensity.
Illustratively, the principle of fingerprint recognition will be described in detail with reference to fig. 9, 10 and 11. During the fingerprint recognition phase, the node H1 inputs a low voltage signal (e.g., a constant voltage signal having a magnitude of-5V), and the signal line Data inputs a high voltage signal (e.g., a constant voltage signal having a magnitude of 1.5V). The whole fingerprint identification stage comprises a preparation stage, a fingerprint signal acquisition stage and a fingerprint signal detection stage. In the preparation phase, the driving chip (not shown in fig. 9, 10 and 11) electrically connected to the fingerprint identification unit 20 controls the thin film transistor T of the fingerprint identification unit 20 to be turned on through the switch control line Gate, and the storage capacitor C is charged until the storage capacitor C is charged. In the fingerprint signal collection phase, the thin film transistor T of the fingerprint identification unit 20 is controlled to be turned off by using the switch control line Gate. When the user presses a finger against the display panel, light emitted from the light emitting unit 120 is irradiated onto the finger and reflected on the surface of the finger fingerprint to form reflected light. The reflected light formed by the reflection of the finger fingerprint is incident into the fingerprint identification unit 20, is received by the photodiode D of the fingerprint identification unit 20, and forms a photocurrent, the direction of which is from the node H2 to the node H1, so that the potential of H2 changes. In the fingerprint signal detection stage, the potential variation of the node H2 can be directly detected, so as to determine the magnitude of the photocurrent.
Optionally, in the fingerprint signal detection stage, the thin film transistor T of the fingerprint identification unit 20 may also be controlled to be turned on by using the switch control line Gate, and at this time, a potential difference exists between two electrodes of the storage capacitor C, and the storage capacitor C is in a charging state, and the magnitude of the photocurrent is determined by detecting the amount of charge charged in the storage capacitor C.
With continued reference to fig. 9, since the ridges 41 in the fingerprint of the finger pressed on the display panel are in contact with the display panel surface, the valleys 42 are not in contact with the display panel surface, causing the reflectance of the light rays impinging on the valleys 42 and the ridges 41 of the fingerprint to be different, thereby causing the intensities of the reflected light formed at the positions of the ridges 41 and the reflected light formed at the positions of the valleys 42 received by the fingerprint identification unit 20 to be different, so that the magnitudes of the converted reflected light into photocurrent by the reflected light formed at the positions of the ridges 41 and the reflected light formed at the positions of the valleys 42 are different. Fingerprint identification can be carried out according to the magnitude of the photocurrent.
Alternatively, referring to fig. 9, the light emitting unit 120 provides a light source for the fingerprint recognition unit 20;
the light emitted from the light emitting unit 120 is reflected by the touch subject to form reflected light, and the reflected light is incident on the fingerprint identification unit 20 for fingerprint identification.
Specifically, the light emitting unit 120 provides a light source for the fingerprint identification unit 20, and an additional light source is not required to be provided for the fingerprint identification unit 20, thereby reducing the thickness of the display panel and the process steps of the display panel.
Fig. 12 is a schematic cross-sectional view of another display panel provided in an embodiment of the present invention, and optionally, referring to fig. 12, the fingerprint identification unit 20 includes a fingerprint identification light source 21 integrated inside the fingerprint identification unit 20;
the light emitted by the fingerprint identification light source 21 is reflected by the touch body to form reflected light, and the reflected light is incident on the fingerprint identification unit 20 to perform fingerprint identification.
Specifically, by integrating the fingerprint identification light source 21 inside the fingerprint identification unit 20, compared with externally arranging the fingerprint identification light source 21, the fingerprint identification light source 21 does not need to be attached to the display panel, and the process is simplified.
Fig. 13 is a schematic cross-sectional view of another display panel provided in an embodiment of the present invention, and optionally, referring to fig. 13, the display panel further includes:
a fingerprint identification light source 21, wherein the fingerprint identification light source 21 is positioned on one side of the light-emitting unit 120 far away from the fingerprint identification unit 20;
the light emitted by the fingerprint identification light source 21 is reflected by the touch body to form reflected light, and the reflected light is incident on the fingerprint identification unit 20 to perform fingerprint identification.
Alternatively, the fingerprint recognition light source 21 may be a surface light source or a collimated light source. Compared with the use of a surface light source, the use of the collimated light source can reduce the crosstalk of the scattered light of the fingerprint among different fingerprint identification units 20, and improve the accuracy of fingerprint identification. However, since the collimated light source tends to be thicker than the area light source, the use of the collimated light source increases the thickness of the display panel.
The embodiment of the invention also provides a display device. Fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 14, the display device 200 includes any one of the display panels 300 according to the embodiments of the present invention. The display panel 300 may be specifically a mobile phone, a tablet computer, a smart wearable device, and the like.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater 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 appended claims.

Claims (13)

1. A display panel, comprising:
the array substrate comprises a first substrate and a plurality of light emitting units positioned on the first substrate; the plurality of light emitting units are sequentially arranged along a first direction, the light emitting units have a first size along the first direction and a second size along a second direction, the first size is smaller than the second size, and the first direction and the second direction are intersected with each other;
the fingerprint identification unit is positioned on one side, far away from the first substrate, of the light emitting unit; the vertical projection of the fingerprint identification unit on the array substrate is positioned between two adjacent rows of light emitting units arranged along the first direction;
the ratio of the second dimension to the first dimension is greater than or equal to 2: 1.
2. The display panel according to claim 1, characterized in that:
the shape of the vertical projection of the light-emitting unit on the first substrate is rectangular or elliptical.
3. The display panel according to claim 1, characterized in that:
the shape of the vertical projection of the fingerprint identification unit on the array substrate is rectangular or elliptical.
4. The display panel according to any one of claims 1 to 3, further comprising:
the packaging layer is positioned on one side, away from the first substrate, of the plurality of light-emitting units;
the fingerprint identification unit is arranged on the packaging layer.
5. The display panel according to claim 4, wherein:
the packaging layer is a transparent rigid cover plate, and the fingerprint identification unit is arranged on one side of the transparent rigid cover plate close to the array substrate.
6. The display panel according to claim 4, wherein:
the packaging layer is a thin film packaging layer, and the fingerprint identification unit is arranged on one side, far away from the array substrate, of the thin film packaging layer.
7. The display panel according to any one of claims 1 to 3, wherein:
the fingerprint identification unit comprises a photosensitive diode, a storage capacitor and a thin film transistor;
the anode of the photosensitive diode is electrically connected with the first electrode of the storage capacitor, and the cathode of the photosensitive diode is electrically connected with the second electrode of the storage capacitor and the source electrode of the thin film transistor; the grid electrode of the thin film transistor is electrically connected with the switch control line, and the drain electrode of the thin film transistor is electrically connected with the signal detection line;
the photodiode is used to convert light reflected by the touch subject into a current signal.
8. The display panel according to any one of claims 1 to 3, wherein:
the light emitting unit includes a first electrode, a light emitting layer, and a second electrode; the light-emitting layer is arranged between the first electrode and the second electrode;
the array substrate further comprises a pixel defining layer; the pixel defining layer has an opening area in which the light emitting unit is located; the vertical projection of the fingerprint identification unit on the array substrate is positioned in a non-opening area of the pixel defining layer.
9. The display panel according to any one of claims 1 to 3, wherein:
the light-emitting unit provides a light source for the fingerprint identification unit;
the light emitted by the light-emitting unit is reflected by the touch main body to form reflected light which is incident to the fingerprint identification unit so as to carry out fingerprint identification.
10. The display panel according to any one of claims 1 to 3, wherein:
the fingerprint identification unit comprises a fingerprint identification light source integrated in the fingerprint identification unit;
the light emitted by the fingerprint identification light source is reflected by the touch main body to form reflected light to enter the fingerprint identification unit so as to carry out fingerprint identification.
11. The display panel according to any one of claims 1 to 3, further comprising:
the fingerprint identification light source is positioned on one side of the light emitting unit, which is far away from the fingerprint identification unit;
the light emitted by the fingerprint identification light source is reflected by the touch main body to form reflected light to enter the fingerprint identification unit so as to carry out fingerprint identification.
12. The display panel according to claim 11, wherein:
the fingerprint identification light source is a surface light source or a collimation light source.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
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