CN113013360B

CN113013360B - Display panel and display device

Info

Publication number: CN113013360B
Application number: CN202110213221.7A
Authority: CN
Inventors: 周菁
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2022-07-12
Anticipated expiration: 2041-02-25
Also published as: CN113013360A

Abstract

The invention provides a display panel and a display device, wherein the display panel comprises a substrate, a driving circuit layer, a light-emitting functional layer, a packaging layer, a touch functional layer and a color filter layer, wherein a light shielding layer of the color filter layer is provided with an opening in a bending area corresponding to the display panel, touch wiring of the touch functional layer is disconnected or bridged by adopting a transparent metal wire in a position corresponding to the opening of the light shielding layer, and a pixel definition layer of the light-emitting functional layer adopts a black organic light resistance material to absorb external light penetrating through the light shielding layer and the touch functional layer; according to the invention, the light shielding layer is provided with the opening corresponding to the bending region, so that the stress generated when the light shielding layer is bent is reduced, and the risk of cracks on the film layer is avoided.

Description

Display panel and display device

Technical Field

The invention relates to the technical field of display, in particular to a display panel and a display device.

Background

With the development of display technology, Organic Light-Emitting Diode (OLED) displays have many advantages such as self-luminescence, wide viewing angle, wide color gamut, fast response speed, high Light-Emitting efficiency, low operating voltage, thin thickness, capability of manufacturing large-sized and flexible displays, and simple process, and are widely used in the fields of display, illumination, intelligent wearing, and the like. At present, in order to prevent the display quality from being affected by the reflection of elements in the OLED display panel to ambient light, a polarizer with an anti-reflection function is generally required to be attached to the light emitting side of the OLED display panel, so that the display quality can be ensured, but the polarizer can cause certain loss to the light emitting side of the OLED display panel, the display brightness of the OLED display panel is reduced, and meanwhile, the polarizer is thick and is not beneficial to bending.

Based on this, a POL-less technology using a Color Filter (Color Filter) instead of a Polarizer (POL) has appeared, which can improve the light-emitting rate of the OLED display panel and reduce the overall thickness of the OLED display. The color film is composed of Red (Red), Green (Green), Blue (Blue) color resists and Black Matrix (BM). The red, green and blue resistors respectively play the roles of emitting light from the R/G/B sub-pixel units of the corresponding light-emitting units, and the BM mainly plays the roles of preventing panel light leakage and reducing panel reflectivity. However, in the bending process of the OLED display screen using the POL-less technology, the BM of the bending area is connected on the whole surface, and no stress release area exists, so that the risk of Crack (Crack) is existed.

Therefore, the existing OLED display screen has the risk of cracks during the bending process and needs to be solved.

Disclosure of Invention

The invention provides a display panel and a display device, which are used for relieving the technical problem that the conventional OLED display screen has a crack risk in the bending process.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the embodiment of the invention provides a display panel, which comprises a substrate, a driving circuit layer, a light-emitting functional layer, a packaging layer and a color filter layer, wherein the substrate is provided with a plurality of light-emitting layers; the driving circuit layer is arranged on the substrate; the light-emitting function layer is arranged on the driving circuit layer and comprises a pixel defining layer; the packaging layer is arranged on the light-emitting functional layer; the color filter layer is arranged above the packaging layer and comprises color film layers positioned in the light emitting area and a light shading layer positioned between the color film layers; the shading layer is arranged in a bending area of the display panel, an opening is formed in the bending area of the display panel, and the display panel is arranged on a preset light path of the opening and used for absorbing light.

The display panel provided by the embodiment of the invention further comprises a touch functional layer arranged between the packaging layer and the color filter layer, wherein the touch functional layer comprises patterned touch wires, and the light shielding layer is arranged corresponding to the touch wires.

In the display panel provided by the embodiment of the invention, the orthographic projection of the color film layer on the substrate is not overlapped with the orthographic projection of the touch trace on the substrate.

In the display panel provided in the embodiment of the invention, the opening penetrates through the light shielding layer.

In the display panel provided in the embodiment of the present invention, the light absorbing layer is disposed on the touch functional layer corresponding to the opening.

In the display panel provided by the embodiment of the invention, the touch trace is disconnected at a position corresponding to the opening.

In the display panel provided by the embodiment of the invention, the touch routing is arranged as the transparent metal wire at the position corresponding to the opening.

In the display panel provided in the embodiment of the present invention, the material of the pixel defining layer includes a black organic color resist, and the pixel defining layer is multiplexed as the light absorbing layer.

In the display panel provided in the embodiment of the present invention, the opening does not penetrate through the light shielding layer, and the light shielding layer is reused as the light absorbing layer.

An embodiment of the present invention further provides a display device, which includes the display panel of one of the foregoing embodiments.

The invention has the beneficial effects that: according to the display panel and the display device, the light shielding layer is provided with the opening in the bending area, so that stress generated when the light shielding layer is bent is reduced, and the risk of cracks on the film layer is avoided.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art, the drawings used in the embodiments or technical solutions in the prior art are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of a bending region of a display panel according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a film structure of a driving circuit layer according to an embodiment of the invention.

Fig. 4 is a schematic view illustrating a contrast relationship between the color filter layer and the touch trace in a top view according to an embodiment of the invention.

Fig. 5 is a schematic cross-sectional view of a display panel bending region according to an embodiment of the invention.

Fig. 6 is a schematic view illustrating another comparison relationship between the color filter layer and the touch trace in a top view according to an embodiment of the disclosure.

Fig. 7 is a schematic cross-sectional view of a display panel bending region according to an embodiment of the invention.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals. In the drawings, the thickness of some layers and regions are exaggerated for clarity of understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily illustrated, but the present invention is not limited thereto.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic top view structure diagram of a display panel according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional structure diagram of a bending region of the display panel according to the embodiment of the present invention. The display panel adopts the POL-less technology, and uses the color filter layer to replace a polarizer, so that the overall thickness of the display module can be greatly reduced. As shown in fig. 1, the display panel 100 has a display area AA and a bending area BA, the bending area BA is located in the display area AA, and the display panel 100 can be bent along the bending area BA to implement flexible functions such as bending and folding.

Referring to fig. 2, the display panel 100 includes a substrate 10, a driving circuit layer 20, a light-emitting functional layer 30, an encapsulation layer 40, and a color filter layer 50. The driving circuit layer 20 is disposed on the substrate 10, and the top film layer is a patterned pixel electrode 21. The light emitting function layer 30 is disposed on the driving circuit layer 20, the light emitting function layer 30 includes a pixel defining layer 31 disposed on the driving circuit layer 20, and the pixel defining layer 31 is provided with a pixel opening at a position corresponding to the pixel electrode 21. The encapsulation layer 40 is disposed on the light emitting function layer 30. The color filter layer 50 is disposed above the package layer 40, and the color filter layer 50 includes a color film layer 51 located in a light emitting area, that is, an area corresponding to the pixel opening, and a light shielding layer 52 located between the color film layer 51.

The light shielding layer 52 is provided with an opening 521 in a bending area BA of the display panel 100, an orthographic projection of the opening 521 on the substrate 10 is not overlapped with an orthographic projection of the pixel opening on the substrate 10, and the display panel 100 is provided with a light absorbing layer for absorbing light on a preset light path of the opening 521, where the preset light path is a path through which the light passes through the opening 521.

In an embodiment, the display panel 100 further includes a touch functional layer 60, the touch functional layer 60 is disposed between the package layer 40 and the color filter layer 50, the touch functional layer 60 includes a patterned touch trace 61, the touch trace 61 is disposed corresponding to the light-shielding layer 52, and an orthographic projection of the touch trace 61 on the substrate 10 completely falls within an orthographic projection range of the light-shielding layer 52 on the substrate 10, that is, the orthographic projection of the touch trace 61 on the substrate 10 is not overlapped with an orthographic projection of the color film layer 51 on the substrate 10.

Optionally, the substrate 10 includes a flexible material such as Polyimide (PI), and the flexible material is used as the substrate to manufacture a flexible display panel, so as to implement special properties such as bending and curling of the display panel 100.

Referring to fig. 2 and fig. 3, fig. 3 is a schematic cross-sectional view of a film structure of a driving circuit layer according to an embodiment of the invention. Optionally, a buffer layer 11 may be further disposed between the substrate 10 and the driving circuit layer 20, a material of the buffer layer 11 may include an inorganic material such as silicon oxide (SiOx), silicon nitride (SiNx), or silicon oxynitride (SiON), and the buffer layer 11 may prevent unwanted impurities or contaminants (e.g., moisture, oxygen, or the like) from diffusing from the substrate 10 into devices that may be damaged by the impurities or contaminants, while providing a flat top surface.

The driving circuit layer 20 includes an active layer 22, a gate insulating layer 23, a gate electrode 24, an interlayer insulating layer 25, a source/drain electrode layer 26, a planarization layer 27, and a pixel electrode 21, which are sequentially stacked on the buffer layer 11. The active layer 22 includes a channel region 221, and a source doped region 222 and a drain doped region 223 located at two sides of the channel region 221, and the gate 24 is disposed corresponding to the channel region 221.

The source and drain layer 26 includes a source electrode 261 and a drain electrode 262, and the source electrode 261 and the drain electrode 262 are respectively connected to the source doped region 222 and the drain doped region 223 of the active layer 22 through a via hole of the interlayer insulating layer 25. The planarization layer 27 is disposed on the source drain layer 26 to provide a flat surface for the driving circuit layer 20, and the pixel electrode 21 is disposed on the surface of the planarization layer 27 and connected to the source electrode 261 or the drain electrode 262 through a via hole of the planarization layer 27, as shown in fig. 3, and the pixel electrode 21 is connected to the drain electrode 262.

The driving circuit layer 20 is used for providing a driving voltage to the light emitting function layer 30 to make the light emitting sub-pixels 32 of the light emitting function layer 30 emit light.

The light emitting function layer 30 includes a pixel defining layer 31, a light emitting sub-pixel 32, and a cathode (not shown). The pixel defining layer 31 is disposed on the pixel electrode 21 and the planarization layer 27, and the pixel defining layer 31 is patterned to form a pixel opening exposing a portion of the pixel electrode 21 to define a disposing region of the light emitting sub-pixel 32. The light emitting sub-pixels 32 are formed of light emitting materials printed in the pixel openings of the pixel defining layer 31, and the light emitting materials of different colors form the light emitting sub-pixels 32 of different colors.

The cathode covers the light emitting sub-pixel 32 and the pixel defining layer 31. The light emitting sub-pixels 32 emit light under the combined action of the pixel electrodes 21 and the cathodes, and the light emitting sub-pixels 32 with different colors emit light with different colors, so as to realize pixel display of the display panel 100.

Optionally, the material of the pixel defining layer 31 includes a black organic photoresist, which is capable of absorbing light.

Optionally, the light emitting function layer 30 may further include a Hole Injection Layer (HIL), a Hole Transport Layer (HTL) disposed between the light emitting sub-pixel 32 and the pixel electrode 21; and an Electron Injection Layer (EIL), an Electron Transport Layer (ETL) disposed between the light emitting sub-pixel 32 and the cathode.

The encapsulation layer 40 may be a thin film encapsulation for protecting the light emitting sub-pixels 32 of the light emitting functional layer 30 and preventing the light emitting sub-pixels 32 from being invalid due to water and oxygen intrusion. Alternatively, the encapsulation layer 40 may be a laminated structure formed by sequentially laminating three films, i.e., a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, or a laminated structure having more layers.

The touch functional layer 60 is disposed on the encapsulation layer 40, the touch functional layer 60 includes patterned touch traces 61 and a protective layer 62 disposed on the touch traces 61, and the protective layer 62 is used for protecting the touch traces 61 and providing a flat top surface for the touch functional layer 60.

Optionally, the touch function layer 60 is directly prepared on the encapsulation layer 40 by using a DOT (Direct-on-cell touch) touch scheme without externally attaching a touch panel, so that the thickness of the display panel 100 can be reduced, and the integration level of the display panel 100 can be improved.

Referring to fig. 2 and fig. 4 in combination, fig. 4 is a schematic diagram illustrating a comparison relationship between a color filter layer and a touch trace in a top view according to an embodiment of the present invention. The color filter layer 50 is disposed on the touch functional layer 60, and the color filter layer 50 includes color film layers 51 located in a light emitting area and a light shielding layer 52 located between the color film layers 51. The color film layer 51 is disposed corresponding to the light emitting sub-pixel 32, and the surface shape of the color film layer 51 is consistent with the surface shape of the light emitting sub-pixel 32.

The color film layer 51 includes a red color film 511, a green color film 512, and a blue color film 513, and accordingly, the light-emitting sub-pixel 32 also includes a red light-emitting sub-pixel, a green light-emitting sub-pixel, and a blue light-emitting sub-pixel. The red color film 511 is disposed corresponding to the red light-emitting sub-pixel, the green color film 512 is disposed corresponding to the green light-emitting sub-pixel, and the blue color film 513 is disposed corresponding to the blue light-emitting sub-pixel.

The color films of different colors allow the light of the corresponding color to transmit, and block the light of other colors from transmitting. For example, the red color film 511 allows the red light emitted by the red light emitting sub-pixel corresponding to the red color film to transmit, and blocks the light of other colors from transmitting.

The color film layers 51 are separated by the light-shielding layer 52, and the material of the light-shielding layer 52 includes an opaque material such as a black matrix, so as to prevent light leakage of the display panel 100 and reduce the reflectivity of the display panel 100. The light-shielding layer 52 is arranged corresponding to the touch trace 61 of the touch functional layer 60, and the patterned shape of the touch trace 61 is consistent with that of the light-shielding layer 52, so that the touch trace 61 and the color film layer 51 have no overlapping part, and light emitted by the light-emitting sub-pixel 32 is not blocked by the touch trace 61, thereby improving the utilization rate of light.

The light shielding layer 52 is provided with an opening 521 corresponding to the bending area BA of the display panel 100, the opening 521 penetrates through the light shielding layer 52, and through the opening 521, the stress generated by the light shielding layer 52 during bending can be reduced, and cracks are prevented from appearing on the film layer.

Alternatively, the surface shape of the opening 521 may be a regular or irregular pattern such as a rectangle, a diamond, an ellipse, etc., and the shape of the opening 521 as shown in fig. 4 is a rectangle.

Further, since the light shielding layer 52 is provided with an opening 521 corresponding to the bending area BA, external ambient light can enter the display panel 100 through the opening 521. In order to prevent the ambient light entering the display panel 100 through the opening 521 from being reflected by the metal wires in the display panel 100, a light absorbing layer for absorbing light is disposed on a predetermined light path of the opening 521.

In one embodiment, the light absorbing layer may be disposed on the touch functional layer corresponding to the opening or disposed over the color filter layer corresponding to the opening. The light absorption layer is made of a material with light absorption performance, such as a black matrix or black glue.

In another embodiment, the pixel defining layer 31 is reused as a light absorbing layer, specifically, the touch trace 61 is disconnected at a position corresponding to the opening 521, so that there is no overlapping portion between the orthographic projection of the opening 521 on the substrate 10 and the orthographic projection of the touch trace 61 on the substrate 10, and the orthographic projection of the opening 521 on the substrate 10 falls within the range of the orthographic projection of the pixel defining layer 31 on the substrate 10. In this way, the ambient light entering the display panel 100 through the opening 521 can directly reach the pixel defining layer 31, and the pixel defining layer 31 is made of a black organic photoresist, which can absorb the ambient light reaching the pixel defining layer 31, so as to prevent the ambient light entering the display panel 100 from being reflected in the display panel 100.

It should be noted that the touch trace 61 is disconnected at a position corresponding to the opening 521, and it is required to ensure that the capacitance and the resistance of the touch function layer 60 are not affected.

In the embodiment, by disposing the color filter layer 50 on the touch functional layer 60, a polarizer is not required to be disposed, and the color filter layer 50 replaces the polarizer, that is, by using the POL-less technology, the thickness of the display panel 100 can be reduced, which is more beneficial to implementing the functions of bending, folding, and the like.

Moreover, the opening 521 is formed in the light shielding layer 52 corresponding to the bending area BA, so that stress generated when the light shielding layer 52 is bent can be reduced, and cracks are prevented from occurring in the film layer. And a light absorption layer for absorbing light is disposed on the preset light path of the opening, so that the external ambient light passing through the opening 521 is absorbed by the light absorption layer, thereby ensuring low reflectivity of the display panel 100 and improving contrast of the display panel 100. This further improves the bending capability of the POL-less structure while ensuring a lower reflectivity of the display panel 100.

In an embodiment, referring to fig. 5 and fig. 6, fig. 5 is a schematic cross-sectional structure diagram of a bending region of a display panel according to an embodiment of the present invention, and fig. 6 is a schematic cross-sectional structure diagram of a color filter layer and a touch trace according to an embodiment of the present invention in another top view. Different from the above embodiment, the touch trace 61 is disposed as a transparent metal wire 63 at a position corresponding to the opening 521. Optionally, the material of the transparent metal line 63 includes indium tin oxide, nano silver line, or other transparent conductive material.

The transparent metal wire 63 can be penetrated by light, so that the external ambient light entering the display panel 101 through the opening 521 can also penetrate through the transparent metal wire 63 of the touch functional layer 60, and is prevented from being reflected by the touch trace 61. The external ambient light passing through the transparent metal line 63 reaches the pixel defining layer 31, the pixel defining layer 31 is made of a black organic photoresist, and the black organic photoresist can absorb the external ambient light reaching the pixel defining layer 31, so that the external ambient light entering the display panel 101 is prevented from being reflected in the display panel 101. For other descriptions, please refer to the above embodiments, which are not repeated herein.

In an embodiment, please refer to fig. 7, and fig. 7 is a schematic cross-sectional structure diagram of a display panel bending region according to an embodiment of the present invention. Different from the above embodiment, the opening 521 on the light shielding layer 52 of the display panel 102 does not penetrate through the light shielding layer 52, and the light shielding layer 52 in the opening 521 is reused as the light absorbing layer, so that while the stress generated when the light shielding layer 52 is bent is reduced, it is not necessary to additionally provide the light absorbing layer and perform a disconnection or bridging design on the touch trace 41 of the touch functional layer 40. For other descriptions, please refer to the above embodiments, which are not repeated herein.

An embodiment of the present invention further provides a display device, which includes the display panel of one of the foregoing embodiments, a device such as a circuit board bound to the display panel, and a cover plate covering the display panel.

According to the above embodiments:

the invention provides a display panel and a display device; the display panel comprises a driving circuit layer, a light-emitting functional layer, a packaging layer, a touch functional layer and a color filter layer which are stacked on a substrate; the top film layer of the driving circuit layer is a patterned pixel electrode; the light-emitting function layer comprises a pixel defining layer, and a pixel opening is formed in the position, corresponding to the pixel electrode, of the pixel defining layer; the color filter layer comprises color films with different colors and a shading layer positioned between the color films with different colors, and the color films with different colors are arranged corresponding to the pixel openings; the light shielding layer is provided with the holes in the bending area of the display panel, so that stress generated when the light shielding layer is bent is reduced, and the risk of Crack of the film layer is avoided; meanwhile, the touch wiring of the touch functional layer is disconnected or bridged by adopting a transparent metal wire at the position corresponding to the light shielding layer opening, and the pixel definition layer adopts a black organic light resistance material, so that external light penetrating through the light shielding layer opening can also pass through the touch functional layer and can be absorbed by the pixel definition layer, and strong reflection is avoided, thereby reducing the overall reflectivity of the display panel and improving the contrast of the display panel.

In view of the foregoing, it is intended that the present invention cover the preferred embodiment of the invention and not be limited thereto, but that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A display panel, comprising:

a substrate;

a driving circuit layer disposed on the substrate;

the light-emitting function layer is arranged on the driving circuit layer and comprises a pixel defining layer;

the packaging layer is arranged on the light-emitting functional layer; and

the color filter layer is arranged above the packaging layer and comprises color film layers positioned in the light emitting area and a light shading layer positioned between the color film layers;

the shading layer is in display panel's bending region is provided with the trompil, the trompil runs through the shading layer, just display panel is in the light absorption layer that is used for absorbing light is set up on the predetermined light path of trompil.

2. The display panel of claim 1, further comprising a touch functional layer disposed between the encapsulation layer and the color filter layer, wherein the touch functional layer includes patterned touch traces, and the light-shielding layer is disposed corresponding to the touch traces.

3. The display panel of claim 2, wherein an orthographic projection of the color film layer on the substrate does not overlap with an orthographic projection of the touch trace on the substrate.

4. The display panel according to claim 2, wherein the light absorbing layer is disposed on the touch functional layer corresponding to the opening.

5. The display panel of claim 2, wherein the touch trace is disconnected at a position corresponding to the opening.

6. The display panel of claim 2, wherein the touch trace is disposed as a transparent metal wire at a position corresponding to the opening.

7. The display panel according to claim 5 or 6, wherein the material of the pixel defining layer comprises a black organic color resist, and the pixel defining layer is multiplexed as the light absorbing layer.

8. A display device characterized by comprising the display panel according to any one of claims 1 to 7.