CN107168586B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107168586B CN107168586B CN201710560345.6A CN201710560345A CN107168586B CN 107168586 B CN107168586 B CN 107168586B CN 201710560345 A CN201710560345 A CN 201710560345A CN 107168586 B CN107168586 B CN 107168586B
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
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- General Physics & Mathematics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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- Electroluminescent Light Sources (AREA)
Abstract
The invention provides a display panel and a display device, the display panel includes: the light-emitting device comprises a light-emitting unit array substrate, a packaging substrate and at least one fingerprint identification unit; the fingerprint identification unit comprises a common electrode, a second electrode, a PIN junction and a first electrode; the second electrode, the first electrode and the PIN structure form a photosensitive diode; the common electrode is electrically connected with the first electrode, and the second electrode and the common electrode form a storage capacitor; the common electrode and/or the first electrode includes a first body portion and a first protrusion portion; the second electrode has a second body portion and a second protrusion portion; the vertical projections of the first projection part and the second projection part on the substrate base plate are overlapped, and the vertical projections of the first projection part and the second projection part on the substrate base plate are both positioned between the vertical projections of two adjacent light-emitting units in the second direction on the substrate base plate. The invention provides a display panel and a display device, which are used for improving fingerprint detection stability.
Description
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.
The fingerprint is composed of a series of ridges and valleys on the surface of the skin at the finger tip, and the intensity of light reflected by the ridges and valleys received by the fingerprint identification unit is different, so that the magnitude of current/voltage signals converted from the reflected light formed at the positions of the ridges and the reflected light formed at the positions of the valleys is different, and then the fingerprint identification can be performed according to the magnitude of the current/voltage signals. The fingerprint identification unit generally comprises a photosensitive diode and a storage capacitor, wherein the photosensitive diode and the storage capacitor jointly convert reflected light of a touch main body into a current/voltage signal, but the fingerprint identification unit has the risk of fingerprint detection error due to the fact that the capacitance value of the storage capacitor in the prior art is small, and normal use of the display panel is affected.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for improving the fingerprint detection stability.
In a first aspect, an embodiment of the present invention provides a display panel, including:
the light-emitting unit array substrate comprises a substrate and a plurality of light-emitting units positioned on one side of the substrate; the plurality of light-emitting units are arranged in an array along a first direction and a second direction which are parallel to the plane of the substrate base plate; the first direction and the second direction intersect;
the packaging substrate is positioned on one side, away from the substrate, of the plurality of light-emitting units;
the fingerprint identification unit is positioned on one side of the packaging substrate close to the light-emitting unit array substrate;
the fingerprint identification unit comprises a photosensitive diode and a storage capacitor, and the fingerprint identification unit sequentially comprises a common electrode, a second electrode, a PIN junction and a first electrode along the direction far away from the substrate base plate; the second electrode, the first electrode and the PIN structure form the photosensitive diode; the common electrode is electrically connected with the first electrode, and the second electrode and the common electrode form the storage capacitor;
the common electrode and/or the first electrode includes a first body portion and a first protrusion portion; the second electrode has a second body portion and a second protrusion portion; the vertical projections of the first body part, the second body part and the PIN junction on the substrate base plate are positioned between the vertical projections of two adjacent light-emitting units along the first direction on the substrate base plate; perpendicular projections of the first protruding portion and the second protruding portion on the substrate base plate are overlapped, and perpendicular projections of the first protruding portion and the second protruding portion on the substrate base plate are located between perpendicular projections of two adjacent light emitting units in the second direction on the substrate base plate.
In a second aspect, an embodiment of the present invention provides a display device, including the display panel described in the first aspect.
The display panel provided by the invention comprises a light-emitting unit array substrate, a packaging substrate and at least one fingerprint identification unit, wherein the light-emitting unit array substrate comprises a substrate and a plurality of light-emitting units positioned on the substrate, and the fingerprint identification unit can perform fingerprint identification according to reflected light of a touch main body. The fingerprint identification unit sequentially comprises a common electrode, a second electrode, a PIN junction and a first electrode along the direction far away from the substrate base plate, the second electrode, the first electrode and the PIN structure form a photosensitive diode, the common electrode is electrically connected with the first electrode, and the second electrode and the common electrode form a storage capacitor. The common electrode and/or the first electrode comprise a first body part and a first protruding part, the second electrode comprises a second body part and a second protruding part, the vertical projection of the first body part, the second body part and the PIN junction on the substrate base plate is positioned between the vertical projection of two adjacent light-emitting units on the substrate base plate along the first direction, the vertical projection of the first protruding part and the second protruding part on the substrate base plate are overlapped, and the vertical projection of the first protruding part and the second protruding part on the substrate base plate is positioned between the vertical projection of two adjacent light-emitting units on the substrate base plate along the second direction. In the display panel provided by the invention, the area of the two pole plates of the storage capacitor is increased due to the existence of the first protruding part and the second protruding part, so that the capacitance value of the storage capacitor is increased, the risk of error in fingerprint detection by the fingerprint identification unit is reduced, and the stability of fingerprint detection is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a fingerprint identification unit according to an embodiment of the present invention;
fig. 2a is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 2b is a schematic cross-sectional view along AA' of FIG. 2 a;
FIG. 2c is an enlarged schematic view of the area S1 in FIG. 2 b;
FIG. 2d is a schematic cross-sectional view along BB' in FIG. 2 a;
fig. 2e is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
fig. 2f is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
fig. 2g is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
fig. 3 is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
fig. 4 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the invention;
fig. 5 is a schematic top view of another display panel according to an embodiment of the present invention;
fig. 6a is a schematic top view of another display panel according to an embodiment of the present invention;
FIG. 6b is a schematic cross-sectional view taken along line CC' of FIG. 6 a;
fig. 7 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 circuit diagram of a fingerprint identification unit according to an embodiment of the present invention, and referring to fig. 1, the circuit of the fingerprint identification unit includes a photodiode D, a storage capacitor C, and a thin film transistor T. The anode of the photosensitive diode D is electrically connected with the first polar plate of the storage capacitor C, and the cathode of the photosensitive diode D is electrically connected with the second polar plate of the storage capacitor C and the source electrode of the thin film transistor T; the Gate of the thin film transistor T is electrically connected to the switch control line Gate, and the drain of the thin film transistor T is electrically connected to the signal line Data. The photodiode D is used to convert light reflected by the touch subject into a current signal, and for clarity, the fingerprint recognition principle will now be described in detail with reference to fig. 1. 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 stage, a driving chip (not shown) electrically connected with the fingerprint identification unit controls the thin film transistor T of the fingerprint identification unit to be conducted through a switch control line Gate, and the storage capacitor C is charged until the storage capacitor C is charged. And in the fingerprint signal acquisition stage, the switch control line Gate is used for controlling the thin film transistor T of the fingerprint identification unit to be closed. When a user presses a finger on the display panel, light emitted by the light emitting unit (taking the light emitting unit as a light source for fingerprint identification as an example) 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, is received by the photosensitive diode D of the fingerprint identification unit, and forms a photocurrent, and the direction of the photocurrent 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. Reflected light reflected by the finger fingerprints irradiates the photosensitive diode D to form photocurrent, the storage capacitor C is discharged according to the magnitude of the photocurrent in a fingerprint signal acquisition stage, the more the illumination is, the more the discharge is, if the capacitance value of the storage capacitor C is smaller, the situation that the reflected light reflected by the finger fingerprints exhausts charges in the storage capacitor C can occur, the photocurrent cannot correctly reflect the light intensity of the reflected light, the fingerprint identification unit is enabled to have the risk of fingerprint detection errors, and the normal use of the display panel is influenced.
Fig. 2a is a schematic top view structure diagram of a display panel according to an embodiment of the present invention, fig. 2b is a schematic cross-sectional structure diagram along AA 'in fig. 2a, fig. 2c is an enlarged schematic structure diagram of a region S1 in fig. 2b, and fig. 2d is a schematic cross-sectional structure diagram along BB' in fig. 2a, and as shown in fig. 2a, fig. 2b, fig. 2c, and fig. 2d, the display panel according to an embodiment of the present invention includes a light emitting unit array substrate 10, a package substrate 20, and at least one fingerprint identification unit 30. The light emitting unit array substrate 10 includes a substrate 11 and a plurality of light emitting units 12 located on one side of the substrate 11, wherein the plurality of light emitting units 12 are arranged in an array along a first direction and a second direction parallel to a plane of the substrate 11, and the first direction and the second direction are crossed. The package substrate 20 is located on a side of the plurality of light emitting units 12 away from the substrate 11. At least one fingerprint identification unit 30 is located on the side of the package substrate 20 close to the light emitting unit array substrate 10, in fig. 2b, the fingerprint identification unit 30 is exemplarily disposed on the package substrate 20, in other embodiments, the fingerprint identification unit 30 may also be disposed on the light emitting unit array substrate 10, which is not limited in this embodiment of the present invention. The fingerprint identification unit 30 comprises a photosensitive diode D and a storage capacitor C, the fingerprint identification unit 30 sequentially comprises a common electrode 34, a second electrode 33, a PIN junction 32 and a first electrode 31 along the direction far away from the substrate base plate 11, and the second electrode 33, the first electrode 31 and the PIN junction 32 form the photosensitive diode D; the second electrode 33 may be an anode of the photodiode D, the second electrode 33 may also be a first plate of the storage capacitor C, the first electrode 31 may be a cathode of the photodiode D, and the common electrode 34 may be a second plate of the storage capacitor. The common electrode 34 is electrically connected to the first electrode 31, and the second electrode 33 and the common electrode 34 form a storage capacitor C. For the sake of clarity, different reference numerals are used to denote the first body portion and the first protrusion of the common electrode, and the first body portion and the first protrusion of the first electrode. The common electrode 34 includes a first body portion 341 of the common electrode 34 and a first protrusion portion 342 of the common electrode 34, and the first electrode 31 includes a first body portion 311 of the first electrode 31 and a first protrusion portion 312 of the first electrode 31; the second electrode 33 has a second body portion 331 and a second protruding portion 332, vertical projections of the first body portion 341 of the common electrode 34, the first body portion 311 of the first electrode 31, the second body portion 331, and the PIN junction 32 on the substrate 11 are located between vertical projections of two adjacent light-emitting units 12 on the substrate 11 in the first direction, vertical projections of the first protruding portion 342 of the common electrode 34 and the first and second protruding portions 311 and 332 of the first electrode 31 on the substrate 11 overlap, and vertical projections of the first protruding portion 342 of the common electrode 34 and the first and second protruding portions 311 and 332 of the first electrode 31 on the substrate 11 are located between vertical projections of two adjacent light-emitting units 12 on the substrate 11 in the second direction. It should be noted that fig. 2d illustrates an example where the common electrode and the first electrode both form the first protruding portion, and in other embodiments, only the common electrode may form the first protruding portion; alternatively, only the first electrode forms the first protrusion, which is not limited in the embodiment of the present invention.
The display panel provided by the embodiment of the invention comprises a light-emitting unit array substrate, a packaging substrate and at least one fingerprint identification unit, wherein the light-emitting unit array substrate comprises a substrate and a plurality of light-emitting units positioned on the substrate, and the fingerprint identification unit can perform fingerprint identification according to reflected light of a touch main body (namely finger fingerprints). The fingerprint identification unit sequentially comprises a common electrode, a second electrode, a PIN junction and a first electrode along the direction far away from the substrate base plate, the second electrode, the first electrode and the PIN structure form a photosensitive diode, the common electrode is electrically connected with the first electrode, and the second electrode and the common electrode form a storage capacitor. The common electrode and/or the first electrode comprise a first body part and a first protruding part, the second electrode comprises a second body part and a second protruding part, the vertical projection of the first body part, the second body part and the PIN junction on the substrate base plate is positioned between the vertical projection of two adjacent light-emitting units on the substrate base plate along the first direction, and the vertical projection of the first protruding part and the second protruding part on the substrate base plate is positioned between the vertical projection of two adjacent light-emitting units on the substrate base plate along the second direction, so that the aperture ratio of the display panel and the normal display function are not influenced. According to the embodiment of the invention, the second electrode and the common electrode form the storage capacitor, the first protruding part and the second protruding part are arranged, and the vertical projections of the first protruding part and the second protruding part on the substrate are overlapped, so that the common electrode and the first electrode have the same potential because the common electrode is electrically connected with the first electrode, and the first protruding part and the second protruding part do not form a new capacitor, but increase the area of two polar plates of the storage capacitor, further increase the capacitance value of the storage capacitor, reduce the risk of error when the fingerprint identification unit performs fingerprint detection, and improve the stability of the fingerprint detection.
Optionally, the fingerprint identification unit 30 further includes a bridge electrode 35 and a thin film transistor T, and the second electrode 33 is electrically connected to the output terminal 36 of the thin film transistor T through the bridge electrode 35. The output terminal 36 of the thin film transistor T may be a source or a drain of the thin film transistor T.
The bridge-spanning electrode 35 may be disposed on the same layer as the common electrode 34, or disposed on a different layer from the common electrode 34, fig. 2e is a schematic cross-sectional structure diagram of another display panel provided in the embodiment of the present invention, as shown in fig. 2e, the bridge-spanning electrode 35 and the common electrode 34 are disposed on the same layer. The bridge-spanning electrode 35 and the common electrode 34 can be formed by the same material in the same process, and the process can be saved by arranging the bridge-spanning electrode 35 and the common electrode 34 in the same layer, thereby improving the operation efficiency.
Optionally, the thin film transistor T is located on a side of the first electrode 31 close to the package substrate 20, and an insulating layer 37 is disposed between the first electrode 31 and the output end 36 of the thin film transistor T. The insulating layer 37 may be made of an organic material, an inorganic material, or a stacked structure of an organic material and an inorganic material.
Preferably, the material of the insulating layer 37 is SiNx. Since the SiNx material has good insulating property, compared with an organic material, the SiNx material with a thinner thickness can achieve better electric insulating property.
Fig. 2f is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention, in which only the common electrode forms the first protruding portion, and the first electrode does not form the first protruding portion, referring to fig. 2a and 2f, the common electrode 34 includes a first body portion 341 and a first protruding portion 342, the bridge-spanning electrode 35 has a bridge-spanning body portion 351 and a bridge-spanning protruding portion 352, vertical projections of the first protruding portion 342 and the bridge-spanning protruding portion 352 on the substrate 11 overlap, and a vertical projection of the first protruding portion 342 and the bridge-spanning protruding portion 352 on the substrate 11 is located between vertical projections of two adjacent light-emitting units 12 in the second direction on the substrate 11. According to the embodiment of the invention, the cross-bridge protruding part is arranged, and the vertical projections of the cross-bridge protruding part and the first protruding part of the common electrode on the substrate are overlapped, so that the areas of the two electrode plates of the storage capacitor are further increased, and the capacitance value of the storage capacitor is further increased. It will be appreciated that in other embodiments it may be provided that only the first electrode forms the first protrusion, or that both the common electrode and the first electrode form the first protrusion.
Fig. 2g is a schematic cross-sectional view of another display panel according to an embodiment of the present invention, in which the common electrode and the first electrode form a first protrusion, and referring to fig. 2a and 2g, alternatively, the common electrode 34 includes a first body portion 341 of the common electrode 34 and a first protrusion portion 342 of the common electrode 34, the first electrode 31 includes a first body portion 311 of the first electrode 31 and a first protrusion portion 312 of the first electrode 31, the output terminal 36 of the thin film transistor T has an output terminal body portion 361 and an output terminal protrusion portion 362, the first protrusion portion 342 of the common electrode 34 and the first protrusion portion 312 and the output terminal protrusion portion 362 of the first electrode 31 overlap in vertical projection on the substrate 11, and the vertical projections of the first protrusion 342 of the common electrode 34 and the first protrusion 312 and the output end protrusion 362 of the first electrode 31 on the substrate base 11 are located between the vertical projections of the adjacent two light emitting cells 12 in the second direction on the substrate base 11. According to the embodiment of the invention, the output end protruding part is arranged, and the vertical projections of the output end protruding part and the first protruding part (including the first protruding part of the common electrode and the first protruding part of the first electrode) on the substrate are overlapped, so that the area of two polar plates of the storage capacitor is further increased, and the capacitance value of the storage capacitor is further increased. It will be appreciated that in other embodiments it may be provided that only the first electrode forms the first protrusion, or that only the common electrode forms the first protrusion.
It should be noted that, when the material of the insulating layer 37 is SiNx, since SiNx can be thinner, the distance between the output end protrusion and the first protrusion, especially the distance between the output end protrusion 362 and the first protrusion 312 of the first electrode 31, is reduced, and thus the capacitance value of the storage capacitor is increased.
Optionally, at least one fingerprint identification unit 30 is located on a side surface of the package substrate 20 close to the plurality of light emitting units 12. The fingerprint identification unit 30 is disposed on the package substrate 20, so as to make room for the light emitting unit array substrate 10, thereby implementing a narrow frame design of the entire display panel.
Fig. 3 is a schematic cross-sectional structure view of another display panel according to an embodiment of the present invention, as shown in fig. 3, the light emitting unit 12 is used as a light source of the fingerprint identification unit 30, and light emitted by the light emitting unit 12 (the direction of the arrow in fig. 3 indicates the light propagation direction) is reflected by a touch subject (i.e., a finger fingerprint) to form reflected light, and then the reflected light is incident on the fingerprint identification unit 30 to perform fingerprint identification.
Fig. 4 is a schematic cross-sectional structure view of another display panel according to an embodiment of the present invention, as shown in fig. 4, the display panel further includes a fingerprint identification light source 40, the fingerprint identification light source 40 is located on a side surface of the substrate 11 away from the fingerprint identification unit 30, and light emitted by the fingerprint identification light source 40 (a direction of arrow in fig. 4 indicates a light propagation direction) is reflected by a touch object (i.e., a finger fingerprint) to form reflected light to be incident on the fingerprint identification unit 30 for performing fingerprint identification. The fingerprint identification light source 40 may be a collimated light source or a surface light source, and compared with the surface light source, the use of the collimated light source can reduce the crosstalk between different fingerprint identification units 30 caused by the light reflected by the fingerprint of the user, thereby improving 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.
On the basis of the above embodiments, optionally, the common electrode 34 is a metal electrode. The metal electrode has good conductivity, and can reduce the attenuation of the electric signal applied to the common electrode 34, so that the common electrode 34 has stable potential.
On the basis of the above embodiments, the first electrode 31 is optionally a transparent electrode. The first electrode 31 may be formed of an Indium Tin Oxide (ITO) material to form a transparent electrode, and the reflected light reflected by the finger fingerprint passes through the transparent electrode and then is irradiated onto the PIN junction 32, and the PIN junction 32 has a photosensitive characteristic and has a unidirectional conductivity. In the absence of light, the PIN junction 32 has a small saturation reverse leakage current, i.e., dark current, at which the photodiode D is turned off. When exposed to light, the saturation reverse leakage current of the PIN junction 32 increases substantially, forming a photocurrent.
Fig. 5 is a schematic top view structure diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 5 and fig. 2c, the display panel further includes a touch electrode 50 and a plurality of touch electrode lines 60 extending along a first direction, the touch electrode 50 includes a plurality of self-capacitance touch electrode blocks 500 arranged in an array, each self-capacitance touch electrode block 500 includes L common electrodes 34 extending along a second direction and arranged along the first direction, and each touch electrode line 60 is electrically connected to all the common electrodes 34 in one self-capacitance touch electrode block 500. The vertical projection of the touch electrode line 60 on the substrate base plate 11 is located between the vertical projections of the two adjacent light-emitting units 12 on the substrate base plate 11. In fig. 5, L is exemplarily set to 4, and the 4 common electrodes 34 in each self-capacitance touch electrode block 500 are electrically connected by one touch electrode line 60. It is understood that the embodiment of the present invention is not limited to L ═ 4, and L may be a positive integer greater than or equal to 1. Since the contact area between the finger and the display panel is much larger than that of the light-emitting unit 12, and the density of the touch electrode is much less than that of the light-emitting unit, on the basis of ensuring the normal touch function, L > 1 may be set to reduce the number of touch electrode lines connected to the touch electrode, so as to reduce the difficulty of wiring and implement the narrow frame design of the display panel.
It is understood that, in addition to multiplexing the common electrode as the self-capacitance touch electrode block, the first electrode can also be multiplexed as the self-capacitance touch electrode block, and in an embodiment, the following may be further provided: each self-capacitance touch electrode block comprises L first electrodes which extend along the second direction and are arranged along the first direction, each touch electrode line is electrically connected with all the first electrodes in one self-capacitance touch electrode block, and L can be a positive integer which is greater than or equal to 1.
Fig. 6a is a schematic top view structure diagram of another display panel according to an embodiment of the present invention, and fig. 6b is a schematic cross-sectional structure diagram along CC' in fig. 6a, and with reference to fig. 6a and fig. 6b, the display panel is a mutual capacitive touch display panel, the mutual capacitive touch display panel further includes a touch electrode and a plurality of touch electrode lines 60, the touch electrode includes a first touch electrode 51 and a second touch electrode 52, the first touch electrode 51 and the second touch electrode 52 are arranged in an insulated and crossed manner, the second touch electrode 52 is located on a side of the first touch electrode 51 away from the package substrate 20, and each first touch electrode 51 includes M common electrodes 34 extending along the second direction and arranged along the first direction. Each of the touch electrode lines 60 is electrically connected to all the common electrodes 34 in one of the first touch electrodes 51 along the second direction. In fig. 6a, M is exemplarily set to 2, and 2 common electrodes 34 in each first touch electrode 51 are electrically connected by one touch electrode line 60. It is understood that the embodiment of the present invention is not limited to M ═ 2, and M may be a positive integer greater than or equal to 1. Since the contact area between the finger and the display panel is much larger than that of the light-emitting unit 12, and the density of the touch electrodes is much less than that of the light-emitting unit, on the basis of ensuring the normal touch function, M > 1 may be set to reduce the number of touch electrode lines connected to the first touch electrode, so as to reduce the difficulty of wiring and implement the narrow-frame design of the display panel.
It is understood that, in addition to multiplexing the common electrode as the first touch electrode, the first electrode can also be multiplexed as the first touch electrode, and in an embodiment, the following may also be provided: each first touch electrode includes M first electrodes extending along the second direction and arranged along the first direction, each touch electrode line is electrically connected to all the first electrodes in one first touch electrode, and M may be a positive integer greater than or equal to 1.
Optionally, the first touch electrode 51 is a touch driving electrode, and the second touch electrode 52 is a touch sensing electrode; alternatively, the first touch electrode 51 is a touch sensing electrode, and the second touch electrode 52 is a touch driving electrode. Mutual capacitance (coupling capacitance) can be formed at the crossed position of the touch sensing electrode and the touch driving electrode, when a human body approaches or contacts the display panel, a capacitance connected with the mutual capacitance in series can be formed between the fingers and the display panel due to the grounding of the human body, the capacitance detected by the touch sensing electrode is reduced, a corresponding touch sensing signal can be generated, and therefore the specific touch occurrence position can be determined through corresponding conversion.
Optionally, the second touch electrode 52 includes N second touch sub-electrodes 520 extending along the first direction and arranged along the second direction, each touch electrode line 60 is electrically connected to all the second touch sub-electrodes 520 in one second touch electrode 52, and a vertical projection of each second touch sub-electrode 520 on the substrate 11 is located between vertical projections of two adjacent light-emitting units 12 on the substrate 11. In fig. 6a, N is exemplarily set to 2, and 2 second touch sub-electrodes 520 in each second touch electrode 52 are electrically connected through one touch electrode line 60. It is understood that the embodiment of the present invention is not limited to N ═ 2, and N may be a positive integer greater than or equal to 1. Since the contact area between the finger and the display panel is much larger than that of the light-emitting unit 12, and the density of the touch electrodes is much less than that of the light-emitting unit, on the basis of ensuring the normal touch function, N > 1 may be set to reduce the number of touch electrode lines connected to the first touch electrode, so as to reduce the difficulty of wiring and implement the narrow-frame design of the display panel.
Fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 7, a display device 100 according to an embodiment of the present invention includes a display panel according to any embodiment of the present invention, which may be a mobile phone as shown in fig. 7, or a computer, a television, an intelligent wearable device, and the like, and this embodiment is not particularly limited thereto.
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 (17)
1. A display panel, comprising:
the light-emitting unit array substrate comprises a substrate and a plurality of light-emitting units positioned on one side of the substrate; the plurality of light-emitting units are arranged in an array along a first direction and a second direction which are parallel to the plane of the substrate base plate; the first direction and the second direction intersect;
the packaging substrate is positioned on one side, away from the substrate, of the plurality of light-emitting units;
the fingerprint identification unit is positioned on one side of the packaging substrate close to the light-emitting unit array substrate;
the fingerprint identification unit comprises a photosensitive diode and a storage capacitor, and the fingerprint identification unit sequentially comprises a common electrode, a second electrode, a PIN junction and a first electrode along the direction far away from the substrate base plate; the second electrode, the first electrode and the PIN structure form the photosensitive diode; the common electrode is electrically connected with the first electrode, and the second electrode and the common electrode form the storage capacitor;
the common electrode and/or the first electrode includes a first body portion and a first protrusion portion; the second electrode has a second body portion and a second protrusion portion; the vertical projections of the first body part, the second body part and the PIN junction on the substrate base plate are positioned between the vertical projections of two adjacent light-emitting units along the first direction on the substrate base plate; perpendicular projections of the first protruding portion and the second protruding portion on the substrate base plate are overlapped, and perpendicular projections of the first protruding portion and the second protruding portion on the substrate base plate are located between perpendicular projections of two adjacent light emitting units in the second direction on the substrate base plate.
2. The display panel according to claim 1, wherein the fingerprint identification unit further comprises a bridge electrode and a thin film transistor, and the second electrode is electrically connected to an output terminal of the thin film transistor through the bridge electrode.
3. The display panel according to claim 2, wherein the bridge-spanning electrode is disposed on the same layer as the common electrode.
4. The display panel according to claim 2, wherein the thin film transistor is located on a side of the first electrode close to the package substrate, and an insulating layer is provided between the first electrode and an output terminal of the thin film transistor.
5. The display panel according to claim 4, wherein a material of the insulating layer is SiNx.
6. The display panel according to claim 2, wherein the bridge-spanning electrode has a bridge-spanning body portion and a bridge-spanning protrusion portion; perpendicular projections of the first protruding portion and the bridge-spanning protruding portion on the substrate base plate are overlapped, and the perpendicular projections of the first protruding portion and the bridge-spanning protruding portion on the substrate base plate are located between perpendicular projections of two adjacent light-emitting units in the second direction on the substrate base plate.
7. The display panel according to claim 2, wherein the output terminal of the thin film transistor has an output terminal body portion and an output terminal protruding portion, vertical projections of the first protruding portion and the output terminal protruding portion on the substrate base overlap, and the vertical projections of the first protruding portion and the output terminal protruding portion on the substrate base are located between vertical projections of two adjacent light emitting units on the substrate base along the second direction.
8. The display panel according to any one of claims 1 to 7, wherein the display panel further comprises a touch electrode and a plurality of touch electrode lines extending in the first direction; the touch electrode comprises a plurality of self-contained touch electrode blocks which are arranged in an array;
each self-capacitance touch electrode block comprises L public electrodes which extend along the second direction and are arranged along the first direction; each touch electrode wire is electrically connected with all the common electrodes in one self-contained touch electrode block; alternatively, the first and second electrodes may be,
each self-capacitance touch electrode block comprises L first electrodes which extend along the second direction and are arranged along the first direction; each touch electrode wire is electrically connected with all the first electrodes in one self-contained touch electrode block;
wherein L is a positive integer greater than or equal to 1.
9. The display panel according to any one of claims 1 to 7, wherein the display panel further comprises a touch electrode and a plurality of touch electrode lines, the touch electrode comprises a first touch electrode and a second touch electrode, and the first touch electrode and the second touch electrode are arranged in an insulated and crossed manner; the second touch electrode is positioned on one side of the first touch electrode, which is far away from the packaging substrate;
each first touch electrode comprises M common electrodes which extend along the second direction and are arranged along the first direction; along the second direction, each touch electrode line is electrically connected with all the common electrodes in one first touch electrode; alternatively, the first and second electrodes may be,
each first touch electrode comprises M first electrodes which extend along the second direction and are arranged along the first direction; each touch electrode line is electrically connected with all the first electrodes in one first touch electrode;
wherein M is a positive integer greater than or equal to 1.
10. The display panel according to claim 9, wherein the first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode; or, the first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode.
11. The display panel according to claim 9, wherein the second touch electrode comprises N second touch sub-electrodes extending along the first direction and arranged along the second direction;
each touch electrode line is electrically connected with all the second touch sub-electrodes in one second touch electrode;
wherein N is a positive integer greater than or equal to 1.
12. The display panel according to claim 1, wherein the common electrode is a metal electrode.
13. The display panel according to claim 1, wherein the first electrode is a transparent electrode.
14. The display panel according to claim 1, wherein the light emitting unit serves as a light source of the fingerprint recognition 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.
15. The display panel according to claim 1, wherein the display panel further comprises a fingerprint identification light source located on a side of the substrate 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.
16. The display panel according to claim 1, wherein at least one of the fingerprint identification units is located on a side surface of the package substrate adjacent to the plurality of light emitting units.
17. A display device comprising the display panel according to any one of claims 1 to 16.
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| CN201710560345.6A CN107168586B (en) | 2017-07-11 | 2017-07-11 | Display panel and display device |
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| CN201710560345.6A CN107168586B (en) | 2017-07-11 | 2017-07-11 | Display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108491801B (en) * | 2018-03-26 | 2021-06-01 | 武汉天马微电子有限公司 | Display panel and display device |
| CN108733260B (en) * | 2018-04-27 | 2021-11-19 | 武汉天马微电子有限公司 | Display panel and display device |
| CN108764081B (en) * | 2018-05-17 | 2021-03-16 | 上海天马有机发光显示技术有限公司 | Display panel and display device |
| CN108776556B (en) * | 2018-07-27 | 2021-02-26 | 京东方科技集团股份有限公司 | Touch display panel, driving method thereof and display device |
| CN109670466A (en) * | 2018-12-25 | 2019-04-23 | 厦门天马微电子有限公司 | Display panel and its driving method and display device |
| CN111384072A (en) * | 2020-04-07 | 2020-07-07 | 武汉华星光电技术有限公司 | Array substrate and display panel |
| WO2021217603A1 (en) * | 2020-04-30 | 2021-11-04 | 深圳市汇顶科技股份有限公司 | Fingerprint recognition device and mobile electronic apparatus |
| CN112069935B (en) * | 2020-08-21 | 2022-07-26 | 昆山国显光电有限公司 | Display panel, display device and manufacturing method of display panel |
| DE112021004654T5 (en) * | 2021-05-06 | 2023-06-29 | Boe Technology Group Co., Ltd. | Display substrate and display device |
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