CN109713003B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
- Publication number
- CN109713003B CN109713003B CN201811612031.7A CN201811612031A CN109713003B CN 109713003 B CN109713003 B CN 109713003B CN 201811612031 A CN201811612031 A CN 201811612031A CN 109713003 B CN109713003 B CN 109713003B
- Authority
- CN
- China
- Prior art keywords
- projection
- display panel
- substrate
- film layer
- fingerprint identification
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention discloses a display panel and a display device, belonging to the technical field of display, wherein the display panel comprises a substrate base plate; the shading layer is positioned on one side of the substrate and comprises a plurality of shading parts; the reflecting film layer is positioned on one side, far away from the substrate, of the shading layer and comprises a plurality of reflecting parts; the photosensitive film layer is positioned on one side, away from the substrate base plate, of the reflection film layer and comprises a plurality of fingerprint identification units; the orthographic projection of the light shielding part to the substrate base plate is a first projection, the orthographic projection of the reflecting part to the substrate base plate is a second projection, the orthographic projection of the fingerprint identification unit to the substrate base plate is a third projection, and the first projection, the second projection and the third projection are overlapped. The display device comprises the display panel. The invention can increase the luminous flux received by the fingerprint identification unit, improve the identification sensitivity of the fingerprint identification unit and improve the fingerprint identification effect of the display panel.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
In recent years, with the spread of mobile display products, information security is receiving attention from consumers. Fingerprints are unique to every person, and with the development of science and technology, various display devices with fingerprint identification functions, such as mobile phones, tablet computers, intelligent wearable devices and the like, appear in the market. Before a user operates the display device with the fingerprint identification function, the user can carry out authority verification only by touching the display device with a finger, and the authority verification process is simplified. Fingerprint identification has uniqueness, is difficult to duplicate, and is widely applied to unlocking and payment confirmation of mobile display products. Among the display panel that has the fingerprint identification function now, all include a plurality of luminescence units and a plurality of fingerprint sensing unit, fingerprint sensing unit can carry out the discernment of fingerprint according to the light that the light source sent forms after the reflection of touch main part, and through the reflectivity difference of fingerprint valley and ridge, the fingerprint sensing unit is realized receiving different fingerprint information differentiation, forms the fingerprint image.
The light sensed by the fingerprint sensing unit in the prior art is reflected by pressing a finger, but part of the reflected light can penetrate through the fingerprint sensing unit, and the fingerprint sensing unit cannot use the part of the reflected light, so that the light flux received by the fingerprint sensing unit can be reduced, and the sensitivity of fingerprint identification is reduced.
Therefore, it is an urgent technical problem to provide a display panel and a display device that can fully utilize light reflected by finger pressing, increase the luminous flux received by the fingerprint sensing unit, and improve the sensitivity of fingerprint identification.
Disclosure of Invention
In view of the above, the present invention provides a display panel, including: a substrate base plate; the shading layer is positioned on one side of the substrate and comprises a plurality of shading parts; the reflecting film layer is positioned on one side, far away from the substrate, of the shading layer and comprises a plurality of reflecting parts; the photosensitive film layer is positioned on one side, away from the substrate base plate, of the reflection film layer and comprises a plurality of fingerprint identification units; the orthographic projection of the light shielding part to the substrate base plate is a first projection, the orthographic projection of the reflecting part to the substrate base plate is a second projection, the orthographic projection of the fingerprint identification unit to the substrate base plate is a third projection, and the first projection, the second projection and the third projection are overlapped.
Based on the same idea, the invention also provides a display device, which comprises the display panel and a backlight module, wherein the backlight module is positioned on one side of the substrate far away from the light shielding layer.
Compared with the prior art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
the display panel provided by the invention has the advantages that the plurality of shading parts correspond to the plurality of fingerprint identification units in the photosensitive film layer in the direction vertical to the substrate base plate, and the light rays emitted to the fingerprint identification units by the structure on one side of the substrate base plate far away from the photosensitive film layer can be shielded, so that the influence of the light generated by the structure on one side of the substrate base plate far away from the photosensitive film layer on the identification light signals of the fingerprint identification units can be avoided, the identification sensitivity of the fingerprint identification units is improved, and the fingerprint identification effect of the display panel is improved. The display panel of the invention also enables the plurality of reflecting parts to correspond to the plurality of fingerprint identification units in the photosensitive film layer in the direction vertical to the substrate through the reflecting film layer which is positioned between the photosensitive film layer and the shading layer and comprises the plurality of reflecting parts, so that the light reflected by the ridges of the finger pressing the light-emitting surface of the display panel, after one part is absorbed by the fingerprint identification unit to generate light sensing current, the other part of light is prevented from being absorbed by the shading layer through the fingerprint identification unit to cause certain light energy waste, the light can be reflected by the reflecting part and then received by the fingerprint identification unit again, the light flux received by the fingerprint identification unit is increased, the identification sensitivity of the fingerprint identification unit is improved, therefore, light reflected by the ridges of the grooves of the fingers pressing the light-emitting surface of the display panel is fully utilized, and the fingerprint identification effect of the display panel is improved.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the present invention;
FIG. 2 is a route diagram of a fingerprint recognition ray of a cross-sectional view of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic plan view illustrating a display panel according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of the pixel cell and fingerprint identification cell of FIG. 7;
FIG. 9 is a schematic circuit diagram of a fingerprint identification unit provided by an embodiment of the present invention;
FIG. 10 is a schematic diagram of another cross-sectional structure of the pixel cell and fingerprint identification cell of FIG. 7;
FIG. 11 is a schematic cross-sectional view of the pixel cell and fingerprint identification cell of FIG. 7;
fig. 12 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 14 is a schematic sectional view taken along line a-a' of fig. 13.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1, fig. 1 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present invention (for clearly illustrating a technical solution of the present embodiment, fig. 1 illustrates only a partial film structure of the display panel), where the display panel according to the present embodiment includes: a base substrate 10; a light-shielding layer 20, the light-shielding layer 20 being located on the substrate 10 side, the light-shielding layer 20 including a plurality of light-shielding portions 201;
the reflecting film layer 30 is positioned on one side of the shading layer 20 far away from the substrate 10, and the reflecting film layer 30 comprises a plurality of reflecting parts 301;
the photosensitive film layer 40 is positioned on one side of the reflecting film layer 30, which is far away from the substrate base plate 10, and the photosensitive film layer 40 comprises a plurality of fingerprint identification units 401;
the orthographic projection of the light shielding part 201 on the substrate 10 is a first projection, the orthographic projection of the reflection part 301 on the substrate 10 is a second projection, the orthographic projection of the fingerprint identification unit 401 on the substrate 10 is a third projection, and the first projection, the second projection and the third projection are overlapped.
Specifically, the display panel of this embodiment includes substrate 10, substrate 10 one side is equipped with light shield layer 20, light shield layer 20 includes a plurality of shading portions 201, a plurality of shading portions 201 correspond with a plurality of fingerprint identification unit 401 in sensitization rete 40 in the direction of perpendicular to substrate 10, shading portions 201 can shelter from the structure (optional, the structure that substrate 10 kept away from sensitization rete 40 one side is for including the backlight unit of backlight) of sensitization rete 40 one side to the light of fingerprint identification unit 401 transmission, thereby can avoid substrate 10 to keep away from the influence of the light that sensitization rete 40 one side structure produced to fingerprint identification unit 401 discernment light signal, improve the discernment sensitivity of fingerprint identification unit 401, thereby promote display panel's fingerprint identification effect. The display panel of this embodiment further includes a reflective film 30 located on a side of the light shielding layer 20 away from the substrate 10, the reflective film 30 is located between the photosensitive film 40 and the light shielding layer 20, the reflective film 30 includes a plurality of reflective portions 301, the plurality of reflective portions 301 correspond to the plurality of fingerprint recognition units 401 in the photosensitive film 40 in a direction perpendicular to the substrate 10, so that a portion of light reflected by the ridges of the fingerprints pressing the light-emitting surface of the display panel is absorbed by the fingerprint recognition units 401, after a photosensitive current is generated, while preventing another portion of light from being absorbed by the light shielding layer 20 through the fingerprint recognition units 401 and causing a certain amount of light energy waste, the light can be received by the fingerprint recognition units 401 again after being reflected by the reflective portions 301, so as to increase the luminous flux received by the fingerprint recognition units 401 and improve the recognition sensitivity of the fingerprint recognition units 401, thereby making full use of the light reflected by the ridges of the fingerprints pressing the light-emitting surface of the display panel, the fingerprint identification effect of the display panel is improved. The orthographic projection of the light shielding part 201 to the substrate 10 is a first projection, the orthographic projection of the reflection part 301 to the substrate 10 is a second projection, the orthographic projection of the fingerprint identification unit 401 to the substrate 10 is a third projection, and the first projection, the second projection and the third projection are overlapped, so that the effect that the light shielding part 201 shields light is improved, the reflection effect that the reflection part 301 reflects the light penetrating through the fingerprint identification unit 401 is further improved, the identification sensitivity of the fingerprint identification unit 401 is further improved, and the fingerprint identification effect of the display panel is further improved.
It should be noted that, in order to clearly illustrate the technical solution of the present embodiment, fig. 1 is only an exemplary film structure of the technical solution of the present embodiment, but is not limited to the film structure, and the display panel may further include other film layers (such as an insulating layer, an array layer, a color film layer, a buffer layer, a planarization layer, and the like), which is not described in detail in this embodiment. The material of the reflective film 30 is not specifically limited in this embodiment, and only the requirement that the light L passing through the fingerprint identification unit 401 is reflected back to the fingerprint identification unit 401 as much as possible is met, and during specific implementation, the material of the reflective film 30 can be selected according to actual reflection requirements. The fingerprint identification unit 401 of this embodiment carries out the fingerprint identification sensing through optical fingerprint identification's technique, and this embodiment does not do the injecing to its concrete structure, only needs to satisfy the reverberation that can form after the reflection of the finger that presses the display panel light-emitting surface light according to the light that the light source sent and carries out the discernment of fingerprint, and reflection line difference through fingerprint line valley and ridge realizes that fingerprint identification unit 401 receives different fingerprint information differentiation, and it can to form fingerprint image.
Optionally, referring to fig. 2, fig. 2 is a schematic diagram of a fingerprint recognition light of a cross-sectional view of a display panel according to an embodiment of the present invention, as shown in fig. 2, the display panel of this embodiment may further include a buffer layer 50 (not filled in the drawing), an array layer 60, a color film layer 70, and a cover plate 80, the buffer layer 50 is located on a side of the reflective film layer 30 away from the substrate 10, the array layer 60 is located between the buffer layer 50 and the photosensitive film layer 40, the color film layer 70 is located on a side of the photosensitive film layer 40 away from the substrate 10, the cover plate 80 is located on a side of the color film layer 70 away from the substrate 10, a light L emitted from a backlight source of the backlight module 00 is reflected by a valley F1 and a ridge F2 of a finger F pressing a light-emitting surface (i.e., the cover plate 80) of the display panel, a portion of the light L is absorbed by the fingerprint recognition unit 401 to generate a light sensing current, another portion of the light, thereby increased the luminous flux that fingerprint identification unit 401 received, promoted fingerprint identification unit 401's identification sensitivity, made the light L who sees through fingerprint identification unit 401 obtain make full use of, promoted display panel's fingerprint identification effect.
In some optional embodiments, please refer to fig. 3, and fig. 3 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention, in which the second projection covers the third projection, and the first projection covers the second projection.
The embodiment further limits the second projection to cover the third projection, that is, the area of the orthographic projection of the reflection portion 301 to the substrate 10 is greater than or equal to the area of the orthographic projection of the fingerprint identification unit 401 to the substrate 10, so that the light passing through the fingerprint identification unit 401 can be reflected to the fingerprint identification unit 401 again by the reflection portion 301 as much as possible, and the phenomenon that part of the light leaks to be reflected by the reflection portion 301 and is transmitted to other film layers below the reflection portion 301 due to too small orthographic projection area of the reflection portion 301 to the substrate 10 is avoided, which is beneficial to avoiding waste of light quantity. The embodiment further defines that the first projection covers the second projection, that is, the area of the orthogonal projection of the light shielding portion 201 to the substrate 10 is greater than or equal to the area of the orthogonal projection of the reflection portion 301 to the substrate 10, and since the area of the orthogonal projection of the reflection portion 301 to the substrate 10 is greater than or equal to the area of the orthogonal projection of the fingerprint identification unit 401 to the substrate 10, it can be ensured that the area of the orthogonal projection of the light shielding portion 201 to the substrate 10 is certainly greater than or equal to the area of the orthogonal projection of the fingerprint identification unit 401 to the substrate 10, so that the light shielding portion 201 has a sufficiently large area to shield the light emitted from the side of the substrate 10 away from the photosensitive film layer 40 (optionally, the side of the substrate 10 away from the photosensitive film layer 40 is configured as a backlight module including a backlight module) to the fingerprint identification unit 401, and thus the influence of the light generated by the side of the substrate 10 away from the photosensitive film layer 40 on the identification light signal of the fingerprint identification unit, the recognition sensitivity of the fingerprint recognition unit 401 is further improved, and the fingerprint recognition effect of the display panel is further improved.
Alternatively, as shown in fig. 3, the area of the orthographic projection of the light shielding portion 201 on the substrate 10 is larger than the area of the orthographic projection of the reflection portion 301 on the substrate 10, and the area of the orthographic projection of the reflection portion 301 on the substrate 10 is larger than the area of the orthographic projection of the fingerprint identification unit 401 on the substrate 10;
alternatively, as shown in fig. 4, fig. 4 is a schematic cross-sectional structure diagram of another display panel provided in the embodiment of the present invention, where an area of an orthogonal projection of the light shielding portion 201 onto the substrate 10 is equal to an area of an orthogonal projection of the reflection portion 301 onto the substrate 10 and also equal to an area of an orthogonal projection of the fingerprint identification unit 401 onto the substrate 10;
alternatively, as shown in fig. 5, fig. 5 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention, an area of a forward projection of the light shielding portion 201 onto the substrate 10 is larger than an area of a forward projection of the reflection portion 301 onto the substrate 10, and the area of the forward projection of the reflection portion 301 onto the substrate 10 is equal to an area of a forward projection of the fingerprint identification unit 401 onto the substrate 10;
alternatively, as shown in fig. 6, fig. 6 is a schematic cross-sectional structure diagram of another display panel provided in the embodiment of the present invention, an area of a forward projection of the light shielding portion 201 onto the substrate 10 is equal to an area of a forward projection of the reflection portion 301 onto the substrate 10, and the area of the forward projection of the reflection portion 301 onto the substrate 10 is larger than an area of a forward projection of the fingerprint identification unit 401 onto the substrate 10; the above embodiments can achieve the effect of further improving the recognition sensitivity of the fingerprint recognition unit 401, and further facilitating the improvement of the fingerprint recognition capability of the display panel, which is not repeated herein.
In some optional embodiments, please refer to fig. 7 and 8, where fig. 7 is a schematic plane structure diagram of a display panel 000 according to an embodiment of the present invention (for clarity, fig. 7 only shows a schematic plane structure diagram of a portion of the display panel), fig. 8 is a schematic cross-sectional structure diagram of a pixel unit 600 and a fingerprint identification unit 401 of fig. 7, an array layer 60 of the display panel 000 further includes a thin film transistor 601, the thin film transistor 601 includes a gate 6011, a source 6012, a drain 6013, and a silicon island 6014, a film layer of the silicon island 6014 is located on a side of the light shielding layer 20 away from the substrate 10, a film layer of the gate 6011 is located on a side of the film layer of the silicon island 6014 away from the substrate 10, a film layer of the source 6012 and the drain 6013 is located on a side of the film layer of the gate 6011 away from the substrate 10, an orthogonal projection of the silicon island 6014 to the substrate 10 is a fourth projection, the fourth projection overlaps the first projection; thin film transistor 601 is electrically connected to fingerprint recognition unit 401.
The embodiment further explains that the array layer 60 of the display panel 000 further includes a thin film transistor 601, the thin film transistor 601 includes a gate 6011, a source 6012, a drain 6013, and a silicon island 6014, the layer of the silicon island 6014 is located on the side of the light shielding layer 20 away from the substrate 10, the layer of the gate 6011 is located on the side of the layer of the silicon island 6014 away from the substrate 10, the layers of the source 6012 and the drain 6013 are located on the side of the layer of the gate 6011 away from the substrate 10, the thin film transistor 601 is used to implement a display function within a display area AA of the display panel, optionally, as shown in fig. 7, the display area AA of the display panel includes a plurality of scan lines G and a plurality of data lines S, the plurality of scan lines G and the plurality of data lines S cross to define an area where the pixel unit 600 is located, the pixel unit 600 includes the thin film transistor 601 and a pixel electrode 602, the pixel electrode 602 is electrically connected to the drain 6013 of, a source 6012 of the thin film transistor 601 is electrically connected to the data line S, and a gate 6011 of the thin film transistor 601 is electrically connected to the scan line G.
Optionally, with continuing reference to fig. 7 and 8, the display area AA of the display panel 000 further includes a plurality of fingerprint scan lines ZG and a plurality of fingerprint signal lines ZS, the plurality of fingerprint scan lines ZG and the plurality of fingerprint signal lines ZS are crossed and insulated to define an area where the fingerprint identification unit 401 is located, the fingerprint identification unit 401 includes a switch transistor 4011 and a photo transistor 4012 that are electrically connected, the switch transistor 4011 includes a D switch gate 40111 on the same layer as the gate 6011, a switch source 40112 on the same layer as the source 6012, a switch drain 40113 on the same layer as the drain 6013, and a switch silicon island 40114 on the same layer as the silicon island 6014, the switch gate 40111 is electrically connected to the fingerprint scan lines ZG, the switch source 40112 is electrically connected to one electrode 221 of the photo transistor 4012, and the switch drain 40113 is electrically connected to the fingerprint signal lines ZS. Further, referring to fig. 9, fig. 9 is a schematic circuit diagram of a fingerprint identification unit according to an embodiment of the present invention, where the photosensitive transistor 4012 is used to detect light intensity, the photosensitive transistor 4012 generates different light intensities under different light intensities, in order to detect light from the top, a transparent metal is generally used as its gate (not filled in the figure), and the switch transistor 4011 is used as an output of a switch to control the light intensity, when the switch transistor 4011 is turned on, a current identification signal generated by the fingerprint identification unit 401 may be transmitted to a driving chip for processing, and then corresponding light intensity information is obtained, so as to obtain an image for fingerprint identification.
In this embodiment, the orthographic projection of the silicon island 6014 on the substrate base plate 10 is defined as a fourth projection, the fourth projection overlaps with the first projection, the orthographic projection of the silicon island 6014 on the substrate base plate 10 overlaps with the orthographic projection of the light shielding portion 201 on the substrate base plate 10, optionally, the orthographic projection of the light shielding portion 201 on the substrate base plate 10 covers the orthographic projection of the silicon island 6014 on the substrate base plate 10, so that the light shielding portion 201 can shield the irradiation of external light on the silicon island 6014, and the influence of leakage current caused by the light on the silicon island 6014 of the thin film transistor 601 is avoided; it is conceivable that the orthographic projection of the light shielding portion 201 to the substrate 10 covers the orthographic projection of the switch silicon island 40114 to the substrate 10, and the same technical effect can be achieved, which is not described herein again. The thin film transistor 601 in this embodiment is electrically connected to the fingerprint identification unit 401, which means that the thin film transistor 601 in the display area AA, the switch transistor 4011 in the fingerprint identification unit 401, and the photo transistor 4012 in the fingerprint identification unit 401 are electrically connected, so that the display panel has a function of fingerprint identification while achieving a display function.
It should be noted that, in order to clearly illustrate the structure of the present embodiment, fig. 7 and fig. 8 only illustrate a part of the film layer structure, and other film layer structures (for example, each insulating layer, etc.) and the routing lines of the non-display area, which are not described in the technical solution of the present embodiment, are not labeled to illustrate, and those skilled in the art can understand that the basic structure of the display panel in the prior art is relevant.
In some optional embodiments, please refer to fig. 1 and fig. 2, in the present embodiment, the material of the reflective film 30 is metal oxide or any one of Au, Ag, and Cu, and the reflectivity of the reflective film 30 is greater than or equal to 40%.
In this embodiment, the material of the reflective film layer 30 is further limited to be metal oxide or any one of Au, Ag, and Cu, and Au, Ag, and Cu, i.e., gold, silver, and copper, are all metal materials with good reflection effects, and are chemical symbols thereof, and the metal materials of Au, Ag, and Cu not only have good reflectivity, but also are beneficial to fully reflecting light reflected by a finger pressing the light-emitting surface of the display panel to the fingerprint identification unit 401, and have high oxidation resistance, thereby being beneficial to increasing the service life of the display panel. The metal oxide is a binary compound consisting of oxygen and another metal chemical element, such as gold oxide, silver oxide, copper oxide and the like, and is a high-reflectivity oxide material. Moreover, this embodiment further illustrates that the reflectivity of the reflective film layer 30 is greater than or equal to 40%, that is, the material of the reflective film layer 30 is not limited to the above-mentioned metal oxide or Au, Ag, Cu, but may also be any other high-reflectivity material with a reflectivity greater than or equal to 40%, which is not described in detail in this embodiment.
In some alternative embodiments, with reference to fig. 1, in the present embodiment, the thickness d1 of the reflective film 30 is in a range of 60-130 nm.
The thickness d1 of the reflective film 30 in the direction perpendicular to the substrate 10 is further limited to be 60-130nm in this embodiment, since the thickness of the reflective film 30 affects the reflective effect, and the reflective effect tends to increase first and then decrease with the increase of the thickness of the reflective film, the thickness d1 of the reflective film 30 is not preferably thinner or thicker, but needs to be between 60-130nm, so that the reflective effect of the reflective film 30 can be in a better state.
In some alternative embodiments, referring to fig. 7 and 10, fig. 10 is a schematic cross-sectional structure diagram of the pixel unit 600 and the fingerprint identification unit 401 of fig. 7, in this embodiment, each fingerprint identification unit 401 includes a photodiode 4013, and the photodiode 4013 includes a first electrode 40131, a second electrode 40132, and a PN junction 40133 located between the first electrode 40131 and the second electrode 40132.
This embodiment further illustrates that each fingerprint recognition unit 401 includes a photodiode 4013, and the photodiode 4013 is used as a photosensitive device for detecting light intensities, and different magnitudes of photocurrents are generated by the photodiode 4013 under different light intensities. The first electrode 40131 and the second electrode 40132 can be a cathode and an anode of the photodiode 4013, respectively, and the PN junction 40133(P-N junction) located between the first electrode 40131 and the second electrode 40132 is a material base of many elements in electronic technology, such as a semiconductor diode and a bipolar transistor, and specifically is a component doped with a P-type semiconductor on one side and an N-type semiconductor on the other side. The photodiode 4013 works under the action of reverse voltage, a very weak reverse current is called a dark current when no light is irradiated, a reverse current which is rapidly increased to dozens of microamperes when light is irradiated is called a photocurrent, the change of the light intensity causes the change of the reverse current, namely, an optical signal is converted into an electrical signal, so that the photoelectric sensor is arranged in the fingerprint identification unit 401 as a photoelectric sensor, when the photodiode 4013 is irradiated, photons carrying energy enter a PN junction 40133, the energy is transferred to bound electrons on covalent bonds, the bound electrons break loose the binding of the covalent bonds after the energy of the bound electrons is increased to a certain degree to form photogenerated carriers, electron hole pairs are generated at the same time, and the carriers drift under the action of the reverse voltage, so that the reverse current is rapidly increased, and the increasing degree of the electron hole pairs is in direct proportion.
It should be noted that the first electrode 40131 of the present embodiment may be one of an anode or a cathode, and the second electrode 40132 is the other of the anode or the cathode, which is not particularly limited in the present embodiment.
In some alternative embodiments, with continued reference to fig. 7 and 10, the material of the photodiode 4013 is one of amorphous silicon or polysilicon or a mixture of the two.
This embodiment further illustrates that the material of the photodiode 4013 is one or a mixture of amorphous silicon or polycrystalline silicon, and polycrystalline silicon (polysilicon) is a form of elemental silicon, is inactive at normal temperature, reacts with oxygen, nitrogen, sulfur, and the like at high temperature, has a large chemical activity in a high-temperature molten state, can react with almost any material, has semiconductor properties, and is an extremely important excellent semiconductor material. When molten elemental silicon is solidified under undercooling conditions, silicon atoms are arranged in the form of a diamond lattice into a plurality of crystal nuclei, and if the crystal nuclei grow into crystal grains with different crystal plane orientations, the crystal grains are combined and crystallized into polycrystalline silicon. Amorphous silicon (amorphous silicon α -Si), also called amorphous silicon, is a form of elemental silicon, and is a direct band semiconductor, and there are many so-called "dangling bonds" inside its structure, that is, there are no electrons that form bonds with surrounding silicon atoms, and these electrons can generate current under the action of electric field, and do not need the help of phonons, so that the amorphous silicon can be made very thin, and has the advantage of low manufacturing cost. The photodiode 4013 in this embodiment may be made of only amorphous silicon, only polysilicon, or a mixture of amorphous silicon and polysilicon, and this embodiment is not particularly limited, and may be selected according to actual situations in specific implementation.
In some optional embodiments, referring to fig. 7 and fig. 11, fig. 11 is another schematic cross-sectional structure diagram of the pixel unit 600 and the fingerprint identification unit 401 of fig. 7, in this embodiment, the photodiode 4013 includes a polysilicon film 90, a first amorphous silicon film 100, and a second amorphous silicon film 110 stacked in sequence along a direction away from the substrate 10, the polysilicon film 90 is electrically connected to the first electrode 40131, and the second amorphous silicon film 110 is electrically connected to the second electrode 40132.
This embodiment further illustrates that when the material of the photodiode 4013 is a mixed material of amorphous silicon and polysilicon, the structure includes a polysilicon film layer 90, a first amorphous silicon film layer 100, and a second amorphous silicon film layer 110 stacked in sequence along a direction away from the substrate 10, where the polysilicon film layer 90 is electrically connected to the first electrode 40131, and the second amorphous silicon film layer 110 is electrically connected to the second electrode 40132. In some alternative embodiments, the photodiode 4013 is fabricated based on LTPS process, and a lateral p-i-n structure is generally adopted, which cannot make the photosensitive film layer have sufficient thickness to absorb the light incident into the fingerprint identification unit 401, so that the fingerprint identification unit 401 has poor photosensitivity, and needs a strong light source, which causes power consumption increase, thereby limiting the practical availability of the lateral p-i-n (positive-induced-negative) structure based on LTPS process.
In this embodiment, the photodiode 4013 is fabricated based on LTPS process, and is formed by mixing stacked polysilicon and amorphous silicon, wherein the polysilicon film 90 (which is the same layer as the silicon island 6014 of the tft 601 in the display area AA) is simultaneously used as a conductive layer to be connected to the first electrode 40131 (cathode), and the second amorphous silicon film 110 is connected to the transparent conductive layer 120 (which is the same layer as the pixel electrode 602 in the display area AA) to be connected to the second electrode 40132 (anode).
In some optional embodiments, please refer to fig. 12, where fig. 12 is a schematic cross-sectional structure diagram of another display panel provided in the embodiments of the present invention, in this embodiment, the display panel further includes a color filter substrate 701, the color filter substrate 701 is located on a side of the photosensitive film layer 40 away from the substrate 10; the color filter substrate 701 comprises a black matrix 7011 and a plurality of color resistors 7012 arranged in an array, wherein the orthographic projection of the black matrix 7011 to the substrate 10 is a fifth projection, and the fifth projection is overlapped with the second projection.
The present embodiment further illustrates that the display panel further includes a color filter substrate 701 located on a side of the photosensitive film layer 40 away from the substrate 10, where the color filter substrate 701 includes a black matrix 7011 (BM) and a plurality of color resistors 7012 (not filled in the figure) arranged in an array, and the black matrix 7011 is an opaque portion deposited between the color resistors (such as a pattern of three primary colors R, G, B), and mainly functions to prevent backlight leakage, thereby improving display contrast, preventing color mixing, and increasing color purity. In the embodiment, the orthographic projection of the black matrix 7011 to the substrate base plate 10 and the orthographic projection of the reflection part 301 to the substrate base plate 10 are set to be overlapped, and since the reflection part 301 of the reflection film layer 30 is only used for reflection, the position of the display panel is not displayed, the orthographic projection of the black matrix 7011 to the substrate base plate 10 and the orthographic projection of the reflection part 301 to the substrate base plate 10 can be set to be overlapped, so that the area of a non-display area of the display panel can be reduced, the aperture ratio of the display panel is improved, and the display effect is enhanced.
In some alternative embodiments, please continue to refer to fig. 1, in the present embodiment, the thickness d2 of the photosensitive film 40 is less than or equal to 600 nm.
The embodiment further defines that the thickness d2 of the photosensitive film 40 is smaller than or equal to 600nm, because the light penetration depth is related to the thickness of the photosensitive film 40, and the light is completely absorbed and identified by the photosensitive film, the thickness d2 of the photosensitive film 40 is required to be at least larger than 600nm, that is, the light penetration phenomenon occurs to the photosensitive film 40 with the thickness within 600nm, but the manufacturing of the photosensitive film 40 with the thickness larger than 600nm is difficult to realize at present, so the thickness d2 of the manufactured photosensitive film 40 is generally smaller than or equal to 600nm, so that by arranging the reflection film 30, a part of the light reflected by the valley ridges of the finger pressing the light-emitting surface of the display panel is absorbed by the fingerprint identification unit 401, after the light sensing current is generated, another part of the light is reflected by the fingerprint identification unit 401 and then is received by the fingerprint identification unit 401 again, so as to increase the light flux received by the fingerprint identification unit 401, the recognition sensitivity of the fingerprint recognition unit 401 is improved, so that light reflected by the ridges of the grooves of the fingers pressing the light-emitting surface of the display panel is fully utilized, and the fingerprint recognition effect of the display panel is improved.
In some optional embodiments, please continue to refer to fig. 1, in the present embodiment, the display panel is any one of a liquid crystal display panel or an organic light emitting display panel.
The present embodiment further explains that the display panel in the above embodiments may be any one of a liquid crystal display panel or an organic light emitting display panel, and the technical solution of the above embodiments is only schematically described by taking the display panel as the liquid crystal display panel as an example, and optionally, the display panel of the present embodiment may also be an organic light emitting display panel. In specific implementation, the structure of the technical solution of this embodiment can be set according to different display panels, which is not described herein.
In some optional embodiments, please refer to fig. 13 and 14, fig. 13 is a schematic structural diagram of a display device 1111 according to an embodiment of the present invention, fig. 14 is a schematic structural diagram of a cross section along the direction a-a' of fig. 13, the display device 1111 according to the embodiment includes the display panel 000 according to the embodiment of the present invention, and further includes a backlight module 00, and the backlight module 00 is located on a side of the substrate 10 away from the light shielding layer 20. The embodiment of fig. 13 only uses a mobile phone as an example to describe the display device 1111, but it should be understood that the display device 1111 provided in the embodiment of the present invention may be other display devices 1111 having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device 1111 provided in the embodiment of the present invention has the beneficial effect of the display panel 000 provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel 000 in the foregoing embodiments, which is not repeated herein.
As can be seen from the above embodiments, the display panel and the display device provided by the present invention at least achieve the following beneficial effects:
the display panel provided by the invention has the advantages that the plurality of shading parts correspond to the plurality of fingerprint identification units in the photosensitive film layer in the direction vertical to the substrate base plate, and the light rays emitted to the fingerprint identification units by the structure on one side of the substrate base plate far away from the photosensitive film layer can be shielded, so that the influence of the light generated by the structure on one side of the substrate base plate far away from the photosensitive film layer on the identification light signals of the fingerprint identification units can be avoided, the identification sensitivity of the fingerprint identification units is improved, and the fingerprint identification effect of the display panel is improved. The display panel of the invention also enables the plurality of reflecting parts to correspond to the plurality of fingerprint identification units in the photosensitive film layer in the direction vertical to the substrate through the reflecting film layer which is positioned between the photosensitive film layer and the shading layer and comprises the plurality of reflecting parts, so that the light reflected by the ridges of the finger pressing the light-emitting surface of the display panel, after one part is absorbed by the fingerprint identification unit to generate light sensing current, the other part of light is prevented from being absorbed by the shading layer through the fingerprint identification unit to cause certain light energy waste, the light can be reflected by the reflecting part and then received by the fingerprint identification unit again, the light flux received by the fingerprint identification unit is increased, the identification sensitivity of the fingerprint identification unit is improved, therefore, light reflected by the ridges of the grooves of the fingers pressing the light-emitting surface of the display panel is fully utilized, and the fingerprint identification effect of the display panel is improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. A display panel, comprising: a substrate base plate; the light shielding layer is positioned on one side of the substrate and comprises a plurality of light shielding parts;
the reflective film layer is positioned on one side, far away from the substrate, of the light shielding layer and comprises a plurality of reflecting parts;
the photosensitive film layer is positioned on one side, away from the substrate base plate, of the reflection film layer and comprises a plurality of fingerprint identification units;
the color film substrate is positioned on one side of the photosensitive film layer, which is far away from the substrate; the color film substrate comprises a black matrix and a plurality of color resistors arranged in an array;
the orthographic projection of the shading part to the substrate base plate is a first projection, the orthographic projection of the reflecting part to the substrate base plate is a second projection, the orthographic projection of the fingerprint identification unit to the substrate base plate is a third projection, the first projection, the second projection and the third projection are overlapped, the orthographic projection of the black matrix to the substrate base plate is a fifth projection, and the fifth projection and the second projection are overlapped.
2. The display panel of claim 1, wherein the second projection overlays the third projection and the first projection overlays the second projection.
3. The display panel according to claim 1, further comprising a thin film transistor, wherein the thin film transistor comprises a gate, a source, a drain, and a silicon island, the film layer on which the silicon island is located on one side of the light shielding layer away from the substrate, the film layer on which the gate is located on one side of the film layer on which the silicon island is located away from the substrate, the film layers on which the source and the drain are located on one sides of the film layers on which the gate is located away from the substrate, an orthogonal projection of the silicon island to the substrate is a fourth projection, and the fourth projection overlaps with the first projection; the thin film transistor is electrically connected with the fingerprint identification unit.
4. The display panel according to claim 1, wherein the material of the reflective film layer is metal oxide or any one of Au, Ag, and Cu, and the reflectivity of the reflective film layer is greater than or equal to 40%.
5. The display panel of claim 1, wherein the reflective film layer has a thickness in the range of 60-130 nm.
6. The display panel according to claim 1, wherein each of the fingerprint recognition units comprises a photodiode including a first electrode, a second electrode, and a PN junction between the first electrode and the second electrode.
7. The display panel according to claim 6,
the material of the photodiode is any one or the mixture of amorphous silicon or polycrystalline silicon.
8. The display panel according to claim 6, wherein the photodiode comprises a polysilicon film layer, a first amorphous silicon film layer and a second amorphous silicon film layer stacked in sequence in a direction away from the substrate, the polysilicon film layer is electrically connected to the first electrode, and the second amorphous silicon film layer is electrically connected to the second electrode.
9. The display panel according to claim 1, wherein the photosensitive film layer has a thickness of less than or equal to 600 nm.
10. The display panel according to claim 1, wherein the display panel is any one of a liquid crystal display panel or an organic light emitting display panel.
11. A display device comprising the display panel of any one of claims 1-10, and further comprising a backlight module disposed on a side of the substrate away from the light-shielding layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811612031.7A CN109713003B (en) | 2018-12-27 | 2018-12-27 | Display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811612031.7A CN109713003B (en) | 2018-12-27 | 2018-12-27 | Display panel and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109713003A CN109713003A (en) | 2019-05-03 |
| CN109713003B true CN109713003B (en) | 2021-06-04 |
Family
ID=66257784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811612031.7A Active CN109713003B (en) | 2018-12-27 | 2018-12-27 | Display panel and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109713003B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11356583B2 (en) | 2019-06-05 | 2022-06-07 | Shanghai Harvest Intelligence Technology Co., Ltd. | Image capturing apparatus, electronic equipment and terminal |
| CN112055133B (en) * | 2019-06-05 | 2023-01-06 | 上海耕岩智能科技有限公司 | Image acquisition device and electronic equipment |
| CN110286514B (en) * | 2019-06-28 | 2021-11-12 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110309775B (en) * | 2019-06-28 | 2022-07-15 | 厦门天马微电子有限公司 | Display panel and display device |
| CN112749588A (en) | 2019-10-30 | 2021-05-04 | 中兴通讯股份有限公司 | Display screen module and terminal |
| CN110890411A (en) * | 2019-11-29 | 2020-03-17 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN111178335A (en) * | 2020-02-27 | 2020-05-19 | 武汉华星光电技术有限公司 | Display panel |
| CN111382700B (en) * | 2020-03-09 | 2022-10-14 | 厦门天马微电子有限公司 | Display device |
| CN111584592B (en) * | 2020-05-22 | 2022-07-29 | 京东方科技集团股份有限公司 | Display panel and preparation method thereof |
| CN111653599B (en) * | 2020-06-17 | 2023-04-07 | 京东方科技集团股份有限公司 | Fingerprint identification display panel and display device |
| CN112002733B (en) * | 2020-08-06 | 2023-12-01 | 武汉华星光电半导体显示技术有限公司 | OLED display device and preparation method |
| CN112380964A (en) * | 2020-11-11 | 2021-02-19 | 京东方科技集团股份有限公司 | Photoelectric detection substrate and display device |
| CN112464799A (en) * | 2020-11-25 | 2021-03-09 | 京东方科技集团股份有限公司 | Fingerprint identification substrate, preparation method thereof, identification method and display device |
| CN112560794B (en) * | 2020-12-29 | 2022-09-13 | 厦门天马微电子有限公司 | Display module and display device |
| CN113327966B (en) * | 2021-05-31 | 2024-02-27 | 京东方科技集团股份有限公司 | Display panel and preparation method thereof |
| CN113469079A (en) * | 2021-07-07 | 2021-10-01 | 上海天马微电子有限公司 | Display panel and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207161A (en) * | 2006-12-15 | 2008-06-25 | 株式会社日立制作所 | Solid-state imaging element, photo-detector and authentication system using the photo-detector |
| CN105336751A (en) * | 2014-06-23 | 2016-02-17 | 上海箩箕技术有限公司 | Photoelectric sensor and manufacturing method thereof |
| CN106355136A (en) * | 2016-07-11 | 2017-01-25 | 京东方科技集团股份有限公司 | Fingerprint identification display device, manufacturing method and driving method thereof |
| CN107423723A (en) * | 2017-08-09 | 2017-12-01 | 京东方科技集团股份有限公司 | A kind of lines recognition means, array base palte and display device |
| CN107851653A (en) * | 2015-08-21 | 2018-03-27 | 高通股份有限公司 | Extend the system and method for the near infrared spectrum response for imaging system |
-
2018
- 2018-12-27 CN CN201811612031.7A patent/CN109713003B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207161A (en) * | 2006-12-15 | 2008-06-25 | 株式会社日立制作所 | Solid-state imaging element, photo-detector and authentication system using the photo-detector |
| CN105336751A (en) * | 2014-06-23 | 2016-02-17 | 上海箩箕技术有限公司 | Photoelectric sensor and manufacturing method thereof |
| CN107851653A (en) * | 2015-08-21 | 2018-03-27 | 高通股份有限公司 | Extend the system and method for the near infrared spectrum response for imaging system |
| CN106355136A (en) * | 2016-07-11 | 2017-01-25 | 京东方科技集团股份有限公司 | Fingerprint identification display device, manufacturing method and driving method thereof |
| CN107423723A (en) * | 2017-08-09 | 2017-12-01 | 京东方科技集团股份有限公司 | A kind of lines recognition means, array base palte and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109713003A (en) | 2019-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109713003B (en) | Display panel and display device | |
| US11101304B2 (en) | Diode and fabrication method thereof, array substrate and display panel | |
| KR100669270B1 (en) | Display device and photoelectric conversion device | |
| CN109037293B (en) | Display panel, manufacturing method thereof and display device | |
| CN108710237B (en) | Display panel and display device | |
| CN108735786B (en) | Organic light emitting display panel and organic light emitting display device | |
| US11532676B2 (en) | Display panel and display apparatus | |
| CN110750021B (en) | Array substrate, display panel and display device | |
| KR100722570B1 (en) | Image reading apparatus, the image reading system equipped with the image reading apparatus | |
| CN109445182B (en) | Display module and display device | |
| CN109801569B (en) | Array substrate, manufacturing method thereof and display device | |
| TWI465979B (en) | Touch panel | |
| CN104934455B (en) | Photoelectric conversion device and electronic equipment | |
| US7462863B2 (en) | Thin film phototransistor, active matrix substrate using the phototransistor, and image scanning device using the substrate | |
| CN108447937B (en) | A kind of photosensory assembly, fingerprint recognition panel and device | |
| EP4300584A1 (en) | Display panel, display module, and electronic device | |
| KR20210138184A (en) | Fingerprint sensor and display device including the same | |
| CN113777819A (en) | Display panel and display device | |
| US20230345794A1 (en) | Display panel and display apparatus | |
| JP2010251496A (en) | Image sensor | |
| CN112018161B (en) | Array substrate, preparation method thereof and display device | |
| KR20220019123A (en) | Fingerprint sensor, method for manufacturing the fingerprint sensor and display device including the fingerprint sensor | |
| CN111258096A (en) | Fingerprint identification display panel, fingerprint identification method and display device | |
| CN112666734B (en) | Liquid crystal display panel and display device | |
| CN108231804A (en) | A kind of photoelectric detection unit and its manufacturing method, photoelectric detection equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |