CN116709810A - Display panel and display device - Google Patents

Abstract

The application relates to a display panel and a display device. The display panel includes: a substrate; a driving structure layer; the display layer group is arranged on one side of the driving structure layer, which is away from the substrate, and comprises a plurality of light-emitting units; the fingerprint identification device is arranged on one side of the driving structure layer, which is away from the substrate; the driving structure layer comprises a display driving circuit and a fingerprint identification driving circuit, the display driving circuit is electrically connected with the light-emitting unit, the fingerprint identification driving circuit is electrically connected with the fingerprint identification device, the display driving circuit comprises a first transistor and a second transistor, the first transistor is a low-temperature polycrystalline silicon thin film transistor, the second transistor is an oxide thin film transistor, and the first transistor and the second transistor are arranged in a non-same layer; the fingerprint identification driving circuit comprises a third transistor, wherein the third transistor is arranged on the same layer as the first transistor and the second transistor, and the orthographic projection of the third transistor on the substrate is at least partially overlapped with the orthographic projection of the other of the first transistor and the second transistor on the substrate.

Description

Display panel and display device

Technical Field

The present application relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

In recent years, OLEDs (Organic Light-Emitting diodes) have been attracting attention in recent years due to their huge application market in the display field. Compared with other display technologies, the OLED display panel has more advantages, such as wide viewing angle, high response speed, no need of backlight illumination, and flexible display. The low temperature poly Oxide (Low Temperature Polycrystalline Oxide, LTPO) technology combines the respective advantages of the low temperature poly silicon thin film transistor (Low Temperature Poly-silicon Thin Film Transistor, LTPS-TFT) and the Oxide thin film transistor (Oxide-TFT), and is one of the important development directions of OLED products.

In addition, the in-screen fingerprint identification technology is also one of the development directions of OLED products. Therefore, how to integrate the on-screen fingerprint recognition technology and the LTPO technology into the same OLED display panel is a problem.

Disclosure of Invention

Based on this, it is necessary to provide a display panel and a display device, which aims to integrate the on-screen fingerprint recognition technology and the LTPO technology into the same display panel.

According to one aspect of the present application, a display panel is provided. The display panel includes: a substrate; the driving structure layer is arranged on one side of the substrate; the display layer group is arranged on one side of the driving structure layer, which is far away from the substrate, and comprises a plurality of light-emitting units; the fingerprint identification device is arranged on one side of the driving structure layer, which is away from the substrate; the driving structure layer comprises a display driving circuit and a fingerprint identification driving circuit, the display driving circuit is electrically connected with the light-emitting unit, the fingerprint identification driving circuit is electrically connected with the fingerprint identification device, the display driving circuit comprises a first transistor and a second transistor, the first transistor is a low-temperature polycrystalline silicon thin film transistor, the second transistor is an oxide thin film transistor, and the first transistor and the second transistor are arranged in a non-same layer; the fingerprint identification driving circuit comprises a third transistor, wherein the third transistor is arranged on the same layer as the first transistor and the second transistor, and the orthographic projection of the third transistor on the substrate is at least partially overlapped with the orthographic projection of the other of the first transistor and the second transistor on the substrate.

The driving structure layer of the display panel comprises a first transistor and a second transistor, wherein the first transistor and the second transistor are electrically connected with the light-emitting unit in the display layer group and used for controlling the display function of the display layer group, the first transistor is a low-temperature polycrystalline silicon thin film transistor, and the second transistor is an oxide thin film transistor. Accordingly, the display panel in the embodiment of the application is a display panel adopting LTPO technology. The display panel further comprises a fingerprint identification device arranged on one side, away from the substrate, of the driving structure layer, and the driving structure layer further comprises a third transistor, wherein the third transistor is electrically connected with the fingerprint identification device and used for realizing a fingerprint identification function. The display panel provided by the embodiment of the application realizes the integration of on-screen fingerprint identification and LTPO water collection. In addition, the first transistor and the second transistor are arranged in a non-same layer, and the third transistor and one of the first transistor and the second transistor are arranged in a same layer, so that the horizontal distance between the transistors in the driving structure layer is reduced, and the pixel density of the display panel is improved.

In some embodiments, the first transistor includes a first low temperature polysilicon active layer, a first gate, a first source, and a first drain; the second transistor includes a first oxide active layer, a second gate, a second source, and a second drain; the low-temperature polysilicon active layer and the oxide active layer are arranged in a non-identical layer, the first grid electrode and the second grid electrode are arranged in a non-identical layer, the first source electrode and the second source electrode are arranged in a non-identical layer, and the first drain electrode and the second drain electrode are arranged in a non-identical layer.

In some embodiments, the third transistor is an oxide thin film transistor, and the third transistor is disposed on the same layer as the second transistor.

In some embodiments, the third transistor includes a second oxide active layer, a third gate, a third source, and a third drain; the second oxide active layer is arranged on the same layer as the first oxide active layer, the third grid electrode is arranged on the same layer as the second grid electrode, the third source electrode is arranged on the same layer as the second source electrode, and the third drain electrode is arranged on the same layer as the second drain electrode.

In some embodiments, the third transistor is a low temperature polysilicon thin film transistor and the third transistor is co-layer with the first transistor.

In some embodiments, the third transistor includes a second low temperature polysilicon active layer, a third gate, a third source, and a third drain; the second low-temperature polysilicon active layer and the first low-temperature polysilicon active layer are arranged in the same layer, the third grid electrode and the first grid electrode are arranged in the same layer, the third source electrode and the first source electrode are arranged in the same layer, and the third drain electrode and the first drain electrode are arranged in the same layer.

In some embodiments, the orthographic projection of the first transistor on the substrate at least partially overlaps the orthographic projection of the second transistor on the substrate.

In some embodiments, the fingerprint recognition device includes: a first electrode electrically connected to the third transistor; the photosensitive element is arranged on one side of the first electrode, which is away from the driving structure layer; the second electrode is arranged on one side of the photosensitive element, which is away from the first electrode; the first electrode is a metal electrode, and the orthographic projection of the first electrode on the substrate covers the orthographic projection of the third transistor on the substrate.

In some embodiments, the second electrode is a transparent electrode.

In some embodiments, the light emitting unit includes an anode, a cathode, and a light emitting functional layer disposed between the anode and the cathode, the display driving circuit is electrically connected to the anode, and an orthographic projection of the first electrode on the substrate and an orthographic projection of the light emitting functional layer on the substrate have no overlapping area.

In some embodiments, the display panel further includes a first metal light blocking layer disposed on a side of the third transistor proximate to the substrate, an orthographic projection of the first metal light blocking layer on the substrate covering an orthographic projection of the third transistor on the substrate.

In some embodiments, the second transistor is disposed on a side of the first transistor facing away from the substrate, the third transistor is disposed on the same layer as the second transistor, and the display panel further includes a second metal light blocking layer disposed on a side of the second transistor adjacent to the substrate.

In some embodiments, the second metal light blocking layer and the first metal light blocking layer are co-layer disposed.

In some embodiments, the display panel further includes a first planarization layer disposed on a side of the first transistor facing away from the substrate and a second planarization layer disposed on a side of the second transistor facing away from the substrate; the display panel further comprises a buffer layer, the buffer layer comprises a plurality of buffer parts which are arranged at intervals, the buffer parts are arranged between the first metal light blocking layer and the third transistor, and the buffer parts are arranged between the second metal light blocking layer and the second transistor.

In some embodiments, the display panel further includes a first light shielding layer and a second light shielding layer, the first light shielding layer is disposed on a side of the fingerprint identification device facing away from the driving structure layer, the second light shielding layer is disposed on a side of the first light shielding layer facing away from the driving structure layer, the first light shielding layer is provided with a first light hole, and the second light shielding layer is provided with a second light hole; the front projection of the second light holes on the substrate and the front projection of the first light holes on the substrate have an overlapping area, and the overlapping area is positioned in the front projection of the fingerprint identification device on the substrate.

In some embodiments, the central axis of the second light-transmitting hole coincides with the central axis of the first light-transmitting hole.

In some embodiments, the display panel further comprises a pixel definition layer provided with pixel openings for defining sub-pixel areas; the pixel definition layer is a transparent film layer and the first light shielding layer is positioned on one side of the pixel definition layer away from the driving structure layer, or the pixel definition layer is a black film layer and the pixel definition layer is multiplexed into the first light shielding layer.

In some embodiments, the display panel further includes a color blocking layer, where the color blocking layer is disposed on a side of the display layer group facing away from the driving structure layer, the color blocking layer includes a plurality of color blocks disposed corresponding to the plurality of light emitting units, and the second light shielding layer is a black matrix disposed on the same layer as the color block.

In some embodiments, the display panel further comprises a lens structure covering the second light-transmitting aperture arrangement.

In some embodiments, the display panel further comprises an infrared blocking layer covering the second light-transmitting aperture arrangement.

In some embodiments, the display panel further includes an OC protection layer disposed on a side of the color blocking layer facing away from the display layer group, the OC protection layer covering the color blocking layer and the second light blocking layer, the OC protection layer having a refractive index less than a refractive index of the lens structure.

According to still another aspect of the present application, there is provided a display device including the display panel in any one of the above embodiments.

In the display device in the embodiment of the application, the driving structure layer in the display panel comprises a first transistor and a second transistor, the first transistor and the second transistor are electrically connected with the light emitting unit in the display layer group so as to control the display function of the display layer group, wherein the first transistor is a low-temperature polycrystalline silicon thin film transistor, and the second transistor is an oxide thin film transistor. Accordingly, the display panel in the embodiment of the application is a display panel adopting LTPO technology. The display panel further comprises a fingerprint identification device arranged on one side, away from the substrate, of the driving structure layer, and the driving structure layer further comprises a third transistor, wherein the third transistor is electrically connected with the fingerprint identification device and used for realizing a fingerprint identification function. The display panel provided by the embodiment of the application realizes the integration of on-screen fingerprint identification and LTPO water collection. In addition, the first transistor and the second transistor are arranged in a non-same layer, and the third transistor and one of the first transistor and the second transistor are arranged in a same layer, so that the horizontal distance between the transistors in the driving structure layer is reduced, and the pixel density of the display panel is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the application (arrows indicate light);

FIG. 2 is a schematic cross-sectional view of a display panel according to another embodiment of the application;

fig. 3 is a schematic structural diagram of a display device according to an embodiment of the application.

Reference numerals:

10. a display panel;

100. a substrate;

200. a driving structure layer; 210. a first transistor; 211. a first low-temperature polysilicon active layer; 212. a first gate; 213. a first source electrode; 214. a first drain electrode; 220. a second transistor; 221. a first oxide active layer; 222. a second gate; 223. a second source electrode; 224. a second drain electrode; 230. a third transistor; 231. a second oxide active layer; 232. a third gate; 233. a third source electrode; 234. a third drain electrode;

300. a fingerprint identification device; 310. a first electrode; 320. a photosensitive element; 330. a second electrode;

400. a light emitting unit;

500. a first metal light blocking layer; 510. A second metal light blocking layer;

600. a first light shielding layer; 610. A first light hole;

700. a second light shielding layer; 710. A second light hole;

800. a pixel definition layer; 810. A pixel opening;

900. color resistance;

1000. a lens structure;

1100. an OC protection layer;

1200. an infrared blocking layer;

1300. a first planarization layer;

1400. a second planarizing layer;

1500. a buffer layer; 1501. a buffer section;

20. a display device;

30. a finger.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In describing positional relationships, when an element such as a layer, film or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present unless otherwise indicated. Further, when a layer is referred to as being "under" another layer, it can be directly under, or one or more intervening elements may also be present. It will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening elements may also be present.

Where the terms "comprising," "having," and "including" are used herein, another component may also be added unless explicitly defined as such, e.g., "consisting of … …," etc. Unless mentioned to the contrary, singular terms may include plural and are not to be construed as being one in number.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.

It will be further understood that when interpreting an element, although not explicitly described, the element is intended to include the range of errors which should be within the acceptable limits of deviation from the particular values identified by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, and is not limited herein.

Further, in the specification, the phrase "planar distribution diagram" refers to the drawing when the target portion is viewed from above, and the phrase "cross-sectional diagram" refers to the drawing when the cross section taken by vertically cutting the target portion is viewed from the side.

Further, the drawings are not 1:1, and the relative dimensions of the various elements are drawn by way of example only in the drawings and are not necessarily drawn to true scale.

In recent years, OLEDs (Organic Light-Emitting diodes) have been attracting attention in recent years due to their huge application market in the display field. Compared with other display technologies, the OLED display panel has more advantages, such as wide viewing angle, high response speed, no need of backlight illumination, and flexible display. The low temperature poly Oxide (Low Temperature Polycrystalline Oxide, LTPO) technology combines the respective advantages of the low temperature poly silicon thin film transistor (Low Temperature Poly-silicon Thin Film Transistor, LTPS-TFT) and the Oxide thin film transistor (Oxide-TFT), and is one of the important development directions of OLED products.

In addition, the in-screen fingerprint recognition technology is also one of the development directions of OLED products, so how to integrate the in-screen fingerprint recognition technology and LTPO technology into the same OLED display panel is a problem worthy of research.

In view of the above problems, an embodiment of the first aspect of the present application proposes a display panel 10, which aims to integrate the on-screen fingerprint recognition technology and LTPO technology into the same display panel 10.

As shown in fig. 1 and 2, a display panel 10 according to an embodiment of the present application includes a substrate 100, a driving structure layer 200, a display layer group, and a fingerprint identification device 300. Specifically, the driving structure layer 200 is disposed on one side of the substrate 100, and the display layer group is disposed on one side of the driving structure layer 200 facing away from the substrate 100, where the display layer group includes a plurality of light emitting units 400. The fingerprint recognition device 300 is disposed on a side of the driving structure layer 200 facing away from the substrate 100. The driving structure layer 200 includes a display driving circuit and a fingerprint identification driving circuit, the display driving circuit is electrically connected with the light emitting unit 400, the fingerprint identification driving circuit is electrically connected with the fingerprint identification device 300, the display driving circuit includes a first transistor 210 and a second transistor 220, the first transistor 210 is a low-temperature polysilicon thin film transistor, the second transistor 220 is an oxide thin film transistor, and the first transistor 210 and the second transistor 220 are disposed in different layers. The fingerprint recognition driving circuit includes a third transistor 230, wherein the third transistor 230 is disposed on the same layer as one of the first transistor 210 and the second transistor 220, and an orthographic projection of the third transistor 230 on the substrate 100 at least partially overlaps an orthographic projection of the other of the first transistor 210 and the second transistor 220 on the substrate 100.

In the display panel 10 of the embodiment of the present application, the driving structure layer 200 includes a display driving circuit for implementing a display function, the display driving circuit includes a first transistor 210 and a second transistor 220, the first transistor 210 is a low-temperature polysilicon thin film transistor, and the second transistor 220 is an oxide thin film transistor. As can be seen from the above, the display panel 10 according to the embodiment of the application is a display panel 10 adopting LTPO technology. The display panel 10 further includes a fingerprint identification device 300 disposed on a side of the driving structure layer 200 facing away from the substrate 100, and the driving structure layer 200 further includes a fingerprint identification driving circuit electrically connected to the fingerprint identification device 300 for implementing a fingerprint identification function. The display panel 10 in the embodiment of the application realizes the integration of on-screen fingerprint identification and LTPO water collection. In addition, the fingerprint recognition circuit includes a third transistor 230, wherein the first transistor 210 and the second transistor 220 are disposed in a non-same layer, the third transistor 230 is disposed in a same layer as one of the first transistor 210 and the second transistor 220, and an orthographic projection of the third transistor 230 on the substrate 100 is at least partially overlapped with an orthographic projection of the other of the first transistor 210 and the second transistor 220 on the substrate 100, so that the horizontal distance between the transistors in the driving structure layer 200 is reduced, thereby improving the pixel density of the display panel 10.

Here, the "horizontal distance" between the transistors refers to a distance in a plane direction perpendicular to the thickness direction of the display panel 10.

In some embodiments, the first transistor 210 includes a first low temperature polysilicon active layer 211, a first gate 212, a first source 213, and a first drain 214. The second transistor 220 includes a first oxide active layer 221, a second gate electrode 222, a second source electrode 223, and a second drain electrode 224. The low temperature polysilicon active layer and the oxide active layer are disposed in a non-identical layer, the first gate 212 and the second gate 222 are disposed in a non-identical layer, the first source 213 and the second source 223 are disposed in a non-identical layer, and the first drain 214 and the second drain 224 are disposed in a non-identical layer. Thus, the non-same layer arrangement relationship of the first transistor 210 and the second transistor 220 in the display panel 10 is achieved.

In one embodiment, the third transistor 230 is an oxide thin film transistor, and the third transistor 230 is disposed on the same layer as the second transistor 220. Thereby, the third transistor 230 can be formed simultaneously with the second transistor 220, thereby simplifying the manufacturing process of the display panel 10.

In particular, the third transistor 230 may include a second oxide active layer 231, a third gate electrode 232, a third source electrode 233, and a third drain electrode 234. Wherein the second oxide active layer 231 is disposed in the same layer as the first oxide active layer 221, the third gate 232 is disposed in the same layer as the second gate 222, the third source 233 is disposed in the same layer as the second source 223, and the third drain 234 is disposed in the same layer as the second drain 224. Thereby, the same layer arrangement of the third transistor 230 and the second transistor 220 is achieved.

In another embodiment, the third transistor 230 is a low temperature polysilicon thin film transistor, and the third transistor 230 is disposed on the same layer as the first transistor 210. Thus, the third transistor 230 may be formed simultaneously with the first transistor 210, thereby simplifying the manufacturing process of the display panel 10.

In particular, the third transistor 230 may include a second low temperature polysilicon active layer, a third gate 232, a third source 233, and a third drain 234. The second low temperature polysilicon active layer is arranged in the same layer as the first low temperature polysilicon active layer 211, the third gate 232 is arranged in the same layer as the first gate 212, the third source 233 is arranged in the same layer as the first source 213, and the third drain 234 is arranged in the same layer as the first drain 214. Thereby, the same layer arrangement of the third transistor 230 and the first transistor 210 is achieved.

In some embodiments, the front projection of the first transistor 210 on the substrate 100 at least partially overlaps the front projection of the second transistor 220 on the substrate 100. Thereby, it is advantageous to increase the arrangement density of the first transistor and/or the second transistor 220 in a direction perpendicular to the thickness direction of the display panel 10, and further to increase the pixel density of the display panel 10.

In some embodiments, the fingerprint recognition device 300 includes a first electrode 310, a photosensitive element 320, and a second electrode 330, where the first electrode 310 is electrically connected to the third transistor 230, the photosensitive element 320 is disposed on a side of the first electrode 310 facing away from the driving structure layer 200, and the second electrode 330 is disposed on a side of the photosensitive element 320 facing away from the first electrode 310. The first electrode 310 is a metal electrode, and the orthographic projection of the first electrode 310 on the substrate 100 covers the orthographic projection of the third transistor 230 on the substrate 100.

The photosensitive element 320 of the fingerprint recognition device 300 is disposed between the first electrode 310 and the second electrode 330, and the photosensitive element 320 has a characteristic of generating electron holes upon illumination, by which a light sensing effect can be obtained. The display panel 10 may detect a fingerprint pattern of a user through the photosensitive element 320. For example, when the finger 30 of the user covers and contacts the fingerprint recognition area of the display panel 10, the light emitted by the light emitting unit 400 is reflected by the finger 30 to form a reflected light, the reflected light passes through the corresponding film layer of the display panel 10 to reach the photosensitive element 320 of the fingerprint recognition device 300, and the photosensitive element 320 can generate different recognition information by the difference of the reflection of the light by the ridges and valleys of the finger 30, so that different fingerprint information can be recorded and recognized.

On the other hand, the first electrode 310 is a metal electrode, and the orthographic projection of the first electrode 310 on the substrate 100 covers the orthographic projection of the third transistor 230 on the substrate 100, thereby making the first electrode 310 play a role of shielding the third transistor 230 from light from the light emitting side of the display panel 10, so that it is possible to prevent the situation that external light from the light emitting side of the display panel 10 irradiates the channel portion of the third transistor 230 to cause electric leakage, and further to facilitate the improvement of the operation stability of the third transistor 230.

Further, the second electrode 330 may be a transparent electrode. Thus, the light reflected by the finger 30 can be ensured to be sensed by the photosensitive element 320 through the second electrode 330, thereby being beneficial to improving the recognition sensitivity of the fingerprint recognition device 300.

Further, the light emitting unit 400 includes an anode, a cathode, and a light emitting functional layer disposed between the anode and the cathode, and the display driving circuit is electrically connected to the anode, and the front projection of the first electrode 310 on the substrate 100 and the front projection of the light emitting functional layer on the substrate 100 do not overlap. So set up, can fingerprint identification device 300 stagger with luminous functional layer and set up to guarantee fingerprint identification's sensitivity.

In some embodiments, the display panel 10 further includes a first metal light blocking layer 500, the first metal light blocking layer 500 is disposed on a side of the third transistor 230 near the substrate 100, and an orthographic projection of the first metal light blocking layer 500 on the substrate 100 covers an orthographic projection of the third transistor 230 on the substrate 100. In this way, the first metal light blocking layer 500 performs a light blocking function on the third transistor 230 from the non-light emitting side of the display panel 10, so that external light from the non-light emitting side of the display panel 10 is prevented from irradiating the channel portion of the third transistor 230 to cause leakage, and further, the operation stability of the third transistor 230 is further improved.

Further, the second transistor 220 is disposed on a side of the first transistor 210 facing away from the substrate 100, the third transistor 230 is disposed on the same layer as the second transistor 220, and the display panel 10 further includes a second metal light blocking layer 510, where the second metal light blocking layer 510 is disposed on a side of the second transistor 220 near the substrate 100. By such arrangement, the second metal light blocking layer 510 can block the second transistor 220 from the non-light-emitting side of the display panel 10, thereby preventing the situation that the external light from the non-light-emitting side of the display panel 10 irradiates the channel part of the second transistor 220 to generate electric leakage, and being beneficial to improving the working stability of the second transistor 220.

Specifically, the second metal light blocking layer 510 may be provided in the same layer as the first metal light blocking layer 500, thereby enabling the second metal light blocking layer 510 and the first metal light blocking layer 500 to be manufactured through the same process, and sharing one mask plate, thereby facilitating simplification of the process and saving of costs.

Further, the display panel 10 further includes a first planarization layer 1300 and a second planarization layer 1400, wherein the first planarization layer 1300 is disposed on a side of the first transistor 210 facing away from the substrate 100, and the second planarization layer 1400 is disposed on a side of the second transistor 220 facing away from the substrate 100. The display panel 10 further includes a buffer layer 1500, the buffer layer 1500 including a plurality of buffer portions 1501 disposed at intervals, the buffer portions 1501 disposed between the first metal light blocking layer 500 and the third transistor 230, and the buffer portions 1501 disposed between the second metal light blocking layer 510 and the second transistor 220.

In this embodiment, the buffer layer 1500 includes a plurality of buffer portions 1501 arranged at intervals, that is, the buffer portions 1501 exist only at positions where the second transistor 220 and the third transistor 230 are located, that is, buffer layer material is removed at other positions in the display panel 10.

Generally, there is water vapor in the planarization layer, and the water vapor may permeate into the buffer layer, which may cause problems such as swelling of the buffer layer, peeling of the buffer layer and the planarization layer, and the like. In the embodiment of the present application, the buffer portion 1501 is only located at the positions of the second transistor 220 and the third transistor 230, and the buffer layer material at other positions in the display panel 10 is removed, so that the contact area between the buffer layer 1500 and the first planarization layer 1300 can be reduced, and the problems of bulge of the buffer layer, peeling of the buffer layer and the planarization layer, and the like can be improved.

In some embodiments, the display panel 10 further includes a first light shielding layer 600 and a second light shielding layer 700, the first light shielding layer 600 is disposed on a side of the fingerprint identification device 300 facing away from the driving structure layer 200, the second light shielding layer 700 is disposed on a side of the first light shielding layer 600 facing away from the driving structure layer 200, the first light shielding layer 600 is provided with a first light hole 610, and the second light shielding layer 700 is provided with a second light hole 710. The front projection of the second light holes 710 on the substrate 100 and the front projection of the first light holes 610 on the substrate 100 have overlapping areas, and the overlapping areas are located within the front projection of the fingerprint recognition device 300 on the substrate 100.

It will be appreciated that the closer the angle of the light reflected by the finger 30 to the receiving surface of the photosensitive element 320 is to 90 °, the more accurate the fingerprint identification device 300 will record and identify the fingerprint. In this embodiment, the first light shielding layer 600 and the second light shielding layer 700 are provided in the display panel 10, and the first light transmitting holes 610 on the first light shielding layer 600 and the second light transmitting holes 710 on the second light shielding layer 700 satisfy: the front projection of the second light holes 710 on the substrate 100 and the front projection of the first light holes 610 on the substrate 100 have overlapping areas, and the overlapping areas are located within the front projection of the fingerprint recognition device 300 on the substrate 100. This makes the first light holes 610, the second light holes 620, and the fingerprint recognition device 300 opposite in the thickness direction of the display panel 10. Therefore, the light reflected by the finger 30 can be screened and collimated through the two light shielding layers and the two light transmission holes, and only the reflected light with an included angle close to 90 ° with the receiving surface of the photosensitive element 320 can pass through the two light transmission holes, and other light with a larger inclination angle can be blocked by the first light shielding layer 600 and the second light shielding layer 700, thereby improving the accuracy of the fingerprint identification device 300 on fingerprint recording and identification.

Further, the central axis of the second light hole 710 coincides with the central axis of the first light hole 610, so that a better collimation effect can be obtained.

In some embodiments, the display panel 10 further includes a pixel definition layer 800, the pixel definition layer 800 being provided with a pixel opening 810 for defining a sub-pixel region. It is understood that the light emitting unit 400 may include an anode, a cathode, and a light emitting functional layer disposed between the anode and the cathode, wherein the light emitting functional layer is disposed within the pixel opening 810, thereby defining a sub-pixel region through the pixel opening 810.

In one embodiment, the pixel defining layer 800 is a black film layer and the pixel defining layer 800 is multiplexed as the first light shielding layer 600. Specifically, the pixel defining layer 800 adopts a black film layer, and the black film layer has an effect of blocking light, so that the pixel defining layer 800 can be multiplexed into the first light shielding layer 600 (as shown in fig. 1).

In another embodiment, the pixel defining layer 800 is a transparent film layer and the first light shielding layer 600 is located on a side of the pixel defining layer 800 facing away from the driving structure layer 200 (as shown in fig. 2). For example, the first light shielding layer 600 may be a black matrix disposed over the pixel defining layer 800.

In some embodiments, the display panel 10 further includes a Color blocking layer disposed on a side of the display layer set facing away from the driving structure layer 200, the Color blocking layer includes a plurality of Color resistors 900 (Color filters) disposed corresponding to the plurality of light emitting units 400, and the second light shielding layer 700 is a black matrix disposed on the same layer as the Color resistors 900.

Specifically, the display panel 10 further includes a color blocking layer disposed on a side of the display layer set facing away from the driving structure layer 200, where the color blocking layer is used to replace the polarizer to implement the anti-reflection function of the display panel 10. The display panel 10 in the embodiment of the present application uses a black matrix disposed in the same layer as the color resist 900 as the second light shielding layer 700, so as to construct a collimating structure. Further, the black matrix is also configured to be disposed between the different color resists 900, so that the problem of optical crosstalk between the different sub-pixels can be prevented.

In some embodiments, the display panel 10 further includes a lens structure 1000, and the lens structure 1000 is disposed to cover the second light holes 710. The lens structure 1000 may function to focus and collimate the optical path, thereby facilitating an increase in the accuracy of the fingerprint identification device 300 in fingerprint recording and identification.

Further, the display panel 10 further includes an OC protection layer 1100, where the OC protection layer 1100 is disposed on a side of the color blocking layer facing away from the display layer group, the OC protection layer 1100 covers the color blocking layer and the second light shielding layer 700, and a refractive index of the OC protection layer 1100 is smaller than that of the lens structure 1000. The OC protective layer 1100 serves to protect the color resist layer on the one hand, and also serves to planarize the color resist layer and the second light shielding layer 700 on the other hand. Further, the OC protective layer 1100 has a refractive index smaller than that of the lens structure 1000, and thus, it is advantageous to expand the range of the fingerprint recognition area on the display panel 10 by utilizing the refractive index difference between the OC protective layer 1100 and the lens structure 1000.

In some embodiments, the display panel 10 further includes an infrared blocking layer 1200, and the infrared blocking layer 1200 is disposed to cover the second light holes 710. In an outdoor environment with strong sunlight, the infrared light is strong and has high penetration rate to the finger 30, so that the infrared light can reach the fingerprint recognition device 300, and the fingerprint recognition of a user fails. The display panel 10 in the embodiment of the application is further provided with the infrared blocking layer 1200, and the infrared blocking layer 1200 is arranged to cover the second light holes 710, so that infrared light is filtered out, and the infrared light cannot reach the fingerprint identification device 300, so that the problem that the fingerprint identification device 300 is affected by the infrared light and fails to identify is avoided. In this way, the display panel 10 can perform fingerprint recognition smoothly even in an outdoor environment.

An embodiment of the second aspect of the present application proposes a display device 20 comprising a display panel 10 according to any of the embodiments of the first aspect. The display device 20 may be a mobile phone as shown in fig. 3, or any electronic product with a display function, including but not limited to the following categories: television, notebook computer, display, tablet computer, digital camera, navigator, etc., and the embodiment of the present application is not particularly limited thereto.

In the display device 20 of the embodiment of the present application, the driving structure layer 200 in the display panel 10 includes a display driving circuit for implementing a display function, the display driving circuit includes a first transistor 210 and a second transistor 220, the first transistor 210 is a low-temperature polysilicon thin film transistor, and the second transistor 220 is an oxide thin film transistor. As can be seen from the above, the display panel 10 according to the embodiment of the application is a display panel 10 adopting LTPO technology. The display panel 10 further includes a fingerprint identification device 300 disposed on a side of the driving structure layer 200 facing away from the substrate 100, and the driving structure layer 200 further includes a fingerprint identification driving circuit electrically connected to the fingerprint identification device 300 for implementing a fingerprint identification function. The display panel 10 in the embodiment of the application realizes the integration of on-screen fingerprint identification and LTPO water collection. In addition, the fingerprint recognition circuit includes a third transistor 230, wherein the first transistor 210 and the second transistor 220 are disposed in a non-same layer, the third transistor 230 is disposed in a same layer as one of the first transistor 210 and the second transistor 220, and an orthographic projection of the third transistor 230 on the substrate 100 is at least partially overlapped with an orthographic projection of the other of the first transistor 210 and the second transistor 220 on the substrate 100, so that the horizontal distance between the transistors in the driving structure layer 200 is reduced, thereby improving the pixel density of the display panel 10.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A display panel, comprising:

a substrate;

the driving structure layer is arranged on one side of the substrate;

the display layer group is arranged on one side of the driving structure layer, which is far away from the substrate, and comprises a plurality of light-emitting units; and

the fingerprint identification device is arranged on one side of the driving structure layer, which is away from the substrate;

the driving structure layer comprises a display driving circuit and a fingerprint identification driving circuit, the display driving circuit is electrically connected with the light-emitting unit, the fingerprint identification driving circuit is electrically connected with the fingerprint identification device, the display driving circuit comprises a first transistor and a second transistor, the first transistor is a low-temperature polycrystalline silicon thin film transistor, the second transistor is an oxide thin film transistor, and the first transistor and the second transistor are arranged in a non-same layer; the fingerprint identification driving circuit comprises a third transistor, wherein the third transistor is arranged on the same layer as the first transistor and the second transistor, and the orthographic projection of the third transistor on the substrate is at least partially overlapped with the orthographic projection of the other of the first transistor and the second transistor on the substrate.

2. The display panel of claim 1, wherein the first transistor comprises a first low temperature polysilicon active layer, a first gate electrode, a first source electrode, and a first drain electrode;

the second transistor includes a first oxide active layer, a second gate, a second source, and a second drain;

the low-temperature polysilicon active layer and the oxide active layer are arranged in a non-identical layer, the first grid electrode and the second grid electrode are arranged in a non-identical layer, the first source electrode and the second source electrode are arranged in a non-identical layer, and the first drain electrode and the second drain electrode are arranged in a non-identical layer;

optionally, the third transistor is an oxide thin film transistor, and the third transistor and the second transistor are arranged on the same layer;

optionally, the third transistor includes a second oxide active layer, a third gate electrode, a third source electrode, and a third drain electrode; the second oxide active layer is arranged on the same layer as the first oxide active layer, the third grid electrode is arranged on the same layer as the second grid electrode, the third source electrode is arranged on the same layer as the second source electrode, and the third drain electrode is arranged on the same layer as the second drain electrode;

optionally, the third transistor is a low-temperature polysilicon thin film transistor, and the third transistor and the first transistor are arranged in the same layer;

optionally, the third transistor includes a second low temperature polysilicon active layer, a third gate electrode, a third source electrode, and a third drain electrode; the second low-temperature polysilicon active layer and the first low-temperature polysilicon active layer are arranged in the same layer, the third grid electrode and the first grid electrode are arranged in the same layer, the third source electrode and the first source electrode are arranged in the same layer, and the third drain electrode and the first drain electrode are arranged in the same layer.

3. The display panel of claim 1, wherein an orthographic projection of the first transistor on the substrate at least partially overlaps an orthographic projection of the second transistor on the substrate.

4. The display panel of claim 1, wherein the fingerprint recognition device comprises:

a first electrode electrically connected to the third transistor;

the photosensitive element is arranged on one side of the first electrode, which is away from the driving structure layer; and

the second electrode is arranged on one side of the photosensitive element, which is away from the first electrode;

the first electrode is a metal electrode, and the orthographic projection of the first electrode on the substrate covers the orthographic projection of the third transistor on the substrate;

optionally, the second electrode is a transparent electrode;

optionally, the light emitting unit includes an anode, a cathode, and a light emitting functional layer disposed between the anode and the cathode, the display driving circuit is electrically connected to the anode, and an area where the orthographic projection of the first electrode on the substrate and the orthographic projection of the light emitting functional layer on the substrate do not overlap.

5. The display panel according to claim 4, further comprising a first metal light-blocking layer provided on a side of the third transistor close to the substrate, an orthographic projection of the first metal light-blocking layer on the substrate covering an orthographic projection of the third transistor on the substrate;

optionally, the second transistor is disposed on a side of the first transistor facing away from the substrate, the third transistor and the second transistor are disposed on the same layer, and the display panel further includes a second metal light blocking layer disposed on a side of the second transistor close to the substrate;

optionally, the second metal light blocking layer and the first metal light blocking layer are arranged on the same layer.

6. The display panel of claim 5, further comprising a first planarization layer disposed on a side of the first transistor facing away from the substrate and a second planarization layer disposed on a side of the second transistor facing away from the substrate;

the display panel further comprises a buffer layer, the buffer layer comprises a plurality of buffer parts which are arranged at intervals, the buffer parts are arranged between the first metal light blocking layer and the third transistor, and the buffer parts are arranged between the second metal light blocking layer and the second transistor.

7. The display panel according to claim 1, further comprising a first light shielding layer and a second light shielding layer, wherein the first light shielding layer is disposed on a side of the fingerprint identification device facing away from the driving structure layer, the second light shielding layer is disposed on a side of the first light shielding layer facing away from the driving structure layer, the first light shielding layer is provided with a first light hole, and the second light shielding layer is provided with a second light hole;

the front projection of the second light holes on the substrate and the front projection of the first light holes on the substrate have an overlapping area, and the overlapping area is positioned in the front projection of the fingerprint identification device on the substrate;

optionally, the central axis of the second light hole coincides with the central axis of the first light hole.

8. The display panel according to claim 7, further comprising a pixel definition layer provided with pixel openings for defining sub-pixel areas;

the pixel definition layer is a transparent film layer and the first light shielding layer is positioned on one side of the pixel definition layer away from the driving structure layer, or the pixel definition layer is a black film layer and the pixel definition layer is multiplexed into the first light shielding layer.

9. The display panel according to claim 7, further comprising a color resist layer disposed on a side of the display layer group facing away from the driving structure layer, the color resist layer including a plurality of color resists disposed corresponding to the plurality of light emitting units, the second light shielding layer being a black matrix disposed on the same layer as the color resist layer;

optionally, the display panel further includes a lens structure, and the lens structure is disposed to cover the second light hole;

optionally, the display panel further includes an infrared blocking layer, where the infrared blocking layer covers the second light hole;

optionally, the display panel further includes an OC protection layer, the OC protection layer is disposed on a side of the color blocking layer facing away from the display layer group, the OC protection layer covers the color blocking layer and the second light shielding layer, and a refractive index of the OC protection layer is smaller than a refractive index of the lens structure.

10. A display device comprising the display panel according to any one of claims 1 to 9.