CN116456745A - Display panel and display device - Google Patents

Abstract

The embodiment of the disclosure provides a display panel and a display device, relates to the technical field of display, and is used for adjusting display brightness of different colors of images under different visual angles and improving the appearance of the images under different visual angles. The display panel includes a substrate, a plurality of sub-pixels, a first light extraction layer, and a second light extraction layer. The plurality of sub-pixels are arranged on the substrate, and the plurality of sub-pixels comprise a red sub-pixel, a blue sub-pixel and a green sub-pixel. The first light extraction layer and the second light extraction layer are arranged on the plurality of sub-pixels, and the second light extraction layer is far away from the substrate compared with the first light extraction layer. Wherein the surface of the first light extraction layer, which is close to the second light extraction layer, comprises a plurality of columnar patterns; at least a portion of the plurality of columnar patterns is disposed along an edge of the red subpixel. The display panel is used for displaying images.

Description

Display panel and display device

Technical Field

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

Background

Organic light emitting diodes (Organic Light Emitting Diode, abbreviated as OLEDs) have been widely used in the display field because of their advantages of self-luminescence, low driving voltage, high luminous efficiency, fast response speed, flexible display, and the like. Such as an OLED display panel.

When the image displayed by the OLED display panel is observed at a small viewing angle, the image display may have the problem of reddening, and the experience of a user for observing the image is reduced.

Disclosure of Invention

An object of an embodiment of the present disclosure is to provide a display panel and a display device for improving redness problems occurring when an image is observed at a small viewing angle.

In order to achieve the above object, the embodiments of the present disclosure provide the following technical solutions:

in one aspect, a display panel is provided. The display panel includes a substrate, a plurality of sub-pixels, a first light extraction layer, and a second light extraction layer. The plurality of sub-pixels are arranged on the substrate, and the plurality of sub-pixels comprise a red sub-pixel, a blue sub-pixel and a green sub-pixel. The first light extraction layer and the second light extraction layer are disposed on the plurality of subpixels, the second light extraction layer being farther from the substrate than the first light extraction layer. Wherein the surface of the first light extraction layer, which is close to the second light extraction layer, comprises a plurality of columnar patterns; at least a portion of the plurality of columnar patterns is disposed along an edge of the red subpixel.

In the display panel, the first light extraction layer and the second light extraction layer are arranged, the plurality of columnar patterns are arranged on the surface, close to the second light extraction layer, of the first light extraction layer, and at least part of the columnar patterns are arranged along the edge of the red sub-pixel. In this way, the columnar pattern can reflect the red light of the small viewing angle emitted by the red sub-pixel, so that the red light of the small viewing angle is reduced, and the red light intensity of the small viewing angle is reduced; and, the outgoing direction of the red light reflected by the columnar pattern is changed to the positive viewing angle, so that the light of the positive viewing angle is increased, thereby increasing the red light intensity of the positive viewing angle. Therefore, the brightness matching degree of the red sub-pixel, the blue sub-pixel and the green sub-pixel under the small visual angle is improved, and the redness problem existing when the image of the display panel is observed under the small visual angle is eliminated.

In some embodiments, at least a portion of the plurality of columnar patterns are located outside of and spaced around the light emitting region of the red subpixel.

In some embodiments, at least a portion of the plurality of columnar patterns are located within the light emitting region of the red subpixel and are disposed proximate to an edge of the light emitting region of the red subpixel.

In some embodiments, at least one sub-pixel of the plurality of sub-pixels has a dimension along a first direction that is greater than a dimension of the sub-pixel along a second direction; the first direction and the second direction are perpendicular to each other and parallel to the substrate. At least part of the columnar patterns are respectively positioned at two opposite sides of the sub-pixel in the first direction.

In some embodiments, the display panel further includes a planarization layer and an encapsulation layer. The flat layer is arranged on one side of the plurality of sub-pixels away from the substrate. The packaging layer is arranged on one side of the flat layer away from the substrate. Wherein the first light extraction layer and the second light extraction layer are disposed between the planarization layer and the encapsulation layer.

In some embodiments, the display panel further includes an encapsulation layer, a black matrix, and a color film layer. The packaging layer is arranged on one side of the plurality of sub-pixels away from the substrate. The black matrix is arranged on one side of the packaging layer far away from the substrate; the black matrix includes a plurality of openings, each opening corresponding to a light emitting region of one subpixel. The color film layer comprises a plurality of filter patterns, and each filter pattern is positioned in one opening. The first light extraction layer and the second light extraction layer are arranged on one side of the black matrix and the color film layer, which is far away from the substrate.

In some embodiments, the refractive index of the first light extraction layer is less than the refractive index of the second light extraction layer.

In some embodiments, the surface of the first light extraction layer adjacent to the second light extraction layer is provided with grooves, and the plurality of columnar patterns are located within the grooves.

In some embodiments, the second light extraction layer fills gaps between the plurality of columnar patterns.

In another aspect, a display device is provided. The display device includes: the display panel according to any one of the above embodiments, and a housing. The housing is configured to support and protect the display panel.

The display device has the same advantages as the display panel provided in some embodiments, and will not be described herein.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that need to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings to those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic illustrations, and are not limiting of the actual size of the products, the actual flow of the methods, etc. according to the embodiments of the present disclosure.

FIG. 1 is a schematic illustration of a range of viewing angles provided in accordance with some embodiments;

FIG. 2 is a graph of red light intensity at different viewing angles provided according to some embodiments;

FIG. 3 is a schematic diagram of a display device provided according to some embodiments;

FIG. 4 is a block diagram of a display panel provided according to some embodiments;

FIG. 5 is a cross-sectional block diagram of a display panel provided according to some embodiments;

FIG. 6 is a block diagram of the display panel of FIG. 4 along the section line C-C;

FIG. 7 is another block diagram of the display panel of FIG. 4 along the section line C-C;

FIG. 8 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 9 is another top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 10 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 11 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 12 is a further block diagram of the display panel of FIG. 4 along the section line C-C;

FIG. 13 is a further block diagram of the display panel of FIG. 4 along the section line C-C;

FIG. 14 is a schematic illustration of a diffraction spot provided in accordance with some embodiments;

FIG. 15 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 16 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 17 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 18 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 19 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 20 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

FIG. 21 is a top view of a pillar pattern of a portion G of the display panel of FIG. 4;

fig. 22 is another schematic diagram of a diffraction spot provided in accordance with some embodiments.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, the term "comprising" is to be interpreted as an open, inclusive meaning, i.e. "comprising, but not limited to, unless the context requires otherwise. In the description of the present specification, the terms "one embodiment," "some embodiments," "example embodiments," "examples," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.

As used herein, "about," "approximately" or "approximately" includes the stated values as well as average values within an acceptable deviation range of the particular values as determined by one of ordinary skill in the art in view of the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

As used herein, "parallel", "perpendicular", "equal" includes the stated case as well as the case that approximates the stated case, the range of which is within an acceptable deviation range as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, where the acceptable deviation range for approximately parallel may be, for example, a deviation within 5 °; "vertical" includes absolute vertical and near vertical, where the acceptable deviation range for near vertical may also be deviations within 5 °, for example. "equal" includes absolute equal and approximately equal, where the difference between the two, which may be equal, for example, is less than or equal to 5% of either of them within an acceptable deviation of approximately equal.

It will be understood that when a layer or element is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present between the layer or element and the other layer or substrate.

Exemplary embodiments are described herein with reference to cross-sectional and/or plan views as idealized exemplary figures. In the drawings, the thickness of layers and the area of regions are exaggerated for clarity. Thus, variations from the shape of the drawings due to, for example, manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of example embodiments.

For ease of understanding, the viewing angle of the display panel 100 will be described first. As shown in fig. 1, an angle between a user's line of sight and a bisector M of the display panel 100 when the user views an image is referred to as a viewing angle, and herein, the bisector M of the display panel 100 is a bisector of the display panel 100 in a vertical direction (the direction being perpendicular to a horizontal direction when the display panel 100 is in an upright position). The viewing angle of the display panel 100 can be divided into: a positive viewing angle, a small viewing angle alpha and a large viewing angle beta.

The positive viewing angle means that the angle between the line of sight of the user and the bisector M of the display panel 100 is 0 or close to 0. The angle approaching 0 is understood to mean that the angle fluctuates within a small range of values, for example 0 to 15 °.

The small viewing angle α means that an angle between a line of sight of a user and a bisector M of the display panel 100 is larger than the positive viewing angle and smaller than the large viewing angle. For example, the small viewing angle α is a viewing angle range of greater than +15° and less than or equal to +30°, greater than-15 ° and less than or equal to-30 °.

The large viewing angle β means that an angle between a line of sight of a user and a bisector M of the display panel 100 is greater than the small viewing angle and less than or equal to ±90°. For example, the large viewing angle β is greater than +30° and less than or equal to +90°, greater than-30 ° and less than or equal to-90 °.

It should be noted that the above numerical ranges are only examples for explaining the positive viewing angle, the small viewing angle, and the large viewing angle β, and should not be construed as limiting the positive viewing angle, the small viewing angle, and the large viewing angle β, and in some other embodiments, the end values of the numerical ranges may be changed.

The "±", "+", "-" refer to the position of the user with respect to the bisector M of the display panel 100, for example, in the case where the display panel 100 is being placed, "+" refers to the user being located on the left side of the bisector M of the display panel 100, and "-" refers to the user being located on the right side of the bisector M of the display panel 100. Alternatively, "+" means that the user is located on the right side of the bisector M of the display panel 100, and "-" means that the user is located on the left side of the bisector M of the display panel 100.

As is apparent from the above description, the position of the user with respect to the display panel 100 gradually changes from facing the display panel 100 to the side of the display panel 100 as the viewing angle gradually increases.

With the development of OLED technology, the requirements of users on the quality of the display image of the OLED display panel are also increasing. For example, the improvement of the color gamut of the display image can improve the appearance of the display image and enhance the user experience. The OLED display panel includes a sub-pixel emitting red light, a sub-pixel emitting blue light, and a sub-pixel emitting green light. However, as shown in fig. 2, in the conventional OLED display panel, the sub-pixel emitting red light displays a stronger light intensity (or the sub-pixel emitting red light has a weaker light intensity decay degree) when viewing the display image of the OLED display panel from a small viewing angle compared with the sub-pixel emitting blue light and green light, resulting in that the sub-pixel emitting red light is not matched with the brightness and color of the sub-pixel emitting blue light and green light, which is liable to cause a problem that the display image observed from a small viewing angle emits red. Especially in the case of a deep red light emitting device in which a sub-pixel emitting red light is made of a deep red material, the problem of red emission of a display image at a small viewing angle is more serious. For example, fig. 2 shows light intensity curves of a deep red light emitting device and a conventional red light emitting device at different angles. The abscissa is the viewing angle (in degrees) and the ordinate is the light intensity (in candela cd). The light intensity curve of the conventional red light emitting device is R1, and the light intensity curve of the deep red light emitting device is R2. Wherein the light intensity of the deep red light emitting device is equal to that of the conventional red light emitting device at a positive viewing angle (0 °). The light intensity of the deep red light emitting device at a small viewing angle (+ -30 deg.) has a tendency to rise (two peaks), and compared with the light intensity of the conventional red light emitting device, the light intensity of the deep red light emitting device is not matched with the light intensities of the conventional blue light emitting device and green light emitting device, resulting in a problem that the display image is reddish.

For this purpose, as shown in fig. 3, the present application provides a display device 1000. The display device 1000 may be, for example, any product or component with a display function, such as a mobile phone, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), a vehicle-mounted computer, a navigator, a wearable device, an Augmented Reality (AR) device, a Virtual Reality (VR) device, and the like. The embodiments of the present disclosure are not limited in this regard. The display device 1000 may be: an organic light emitting diode (Organic Light Emitting Diode, abbreviated as OLED) display device, a quantum dot light emitting diode (Quantum Dot Light Emitting Diodes, abbreviated as QLED) display device, and the like, the embodiments of the present disclosure are not limited to the specific type of the display device 1000 described above.

The display device 1000 includes a display panel 100 and a housing (not shown in fig. 1). The case serves to provide support and protection for the display panel 100. The structure of the display panel 100 will be described below by taking the display device 1000 as an OLED display device as an example.

In some examples, as shown in fig. 4, the display panel 100 includes a display area AA and a peripheral area BB surrounding the display area AA. The display area AA includes a plurality of subpixels 120. For convenience of explanation, the plurality of sub-pixels 120 are described as being arranged in a matrix form in the present disclosure. The shape of the sub-pixel 120 includes, but is not limited to, rectangular, pentagonal, octagonal, circular, and the like.

In the display area AA of the display panel 100, a light emitting device and a pixel driving circuit (not shown in fig. 4) for controlling the light emitting device to emit light are disposed in the sub-pixel 120. The pixel driving circuit is disposed on the substrate 110; the pixel driving circuit includes a plurality of thin film transistors (Thin film transistor, TFT for short), at least one capacitor, a plurality of signal lines, and the like, such as a "5T1C", "7T1C" circuit, or a "7T2C" circuit, where T is a thin film transistor, and a number in front of T is the number of thin film transistors; c is the capacitor and the number preceding C is the number of capacitors. The light emitting device is disposed at a side of the pixel driving circuit remote from the substrate 110. The light emitting device includes a pixel anode, a light emitting function pattern on the pixel anode, and a cathode layer.

As shown in fig. 4, the display panel 100 further includes a driving circuit board PCB, a Source Driver IC (SD IC for short), and a gate driving circuit (Gate Driver On Array, GOA for short) disposed in the peripheral area BB. The PCB comprises a timing controller (Timing Controller, abbreviated as TCON), a power management chip DC/DC, an adjustable resistor voltage divider circuit (for generating Vcom) and other driving circuits. The PCB is coupled with the SD IC to control the source driver SDIC to output the data signal. And, the PCB is coupled to at least one control signal line to input a control signal into the GOAs coupled to the control signal line, such that the GOAs scan the plurality of sub-pixels 120 arranged in a matrix form line by line. Therefore, image display is realized under the combined action of electronic elements and circuits such as a drive circuit board, SDIC, GOA, a pixel drive circuit, a light emitting device, and the like.

The structure of the sub-pixel 120 is exemplarily described below based on a specific film layer structure of the display panel 100. As shown in fig. 5, the display panel 100 includes a substrate 110 and a plurality of sub-pixels 120. The film layer structure where the plurality of sub-pixels 120 are located includes a driving circuit stack 101 and a light emitting device stack 102. It is understood that the driving circuit stack 101 refers to a film layer where a plurality of pixel circuit arrays are located, and includes a plurality of patterned conductive layers and insulating layers. The driver circuit stack 101 includes a thin film transistor (Thin film transistor, TFT) and a plurality of signal lines, for example.

The material of the substrate 110 may be a rigid material such as glass, quartz, or plastic, or a flexible material such as a polymer resin.

The driving circuit stack 101 is disposed on a substrate 110. The driving circuit stack 101 includes a buffer layer 1, a semiconductor layer 2, a first gate insulating layer 3, a first gate metal layer 4, a second gate insulating layer 5, a second gate metal layer 6, an interlayer dielectric layer 7, a source drain metal layer 8, a passivation layer 9, and an internal planarization layer 10. Wherein the semiconductor layer 2 comprises an active layer 21 of the TFT. The first gate metal layer 4 comprises the gate 41 of the TFT and the first electrode 42 of the capacitor. The second gate metal layer 6 comprises the second pole 61 of the capacitor. The source drain metal layer 8 includes sources 81 and drains 82 of a plurality of TFTs.

It is understood that the thin film transistors included in the driving circuit stack 101 may be top gate thin film transistors or bottom gate thin film transistors, which are not limited in the embodiments of the present disclosure. The thin film transistor TFT shown in fig. 5 is a top gate thin film transistor.

The light emitting device stack 102 includes a plurality of light emitting devices L and a pixel defining layer 12. The driving circuit stack 101 is coupled to the plurality of light emitting devices L and configured to drive the plurality of light emitting devices L to emit light. The light emitting device L includes a pixel anode 11, a light emitting functional layer 13, and a cathode layer 14.

The material used for the plurality of pixel anodes 11 may include a conductive oxide such as any one or more of Indium Tin Oxide (ITO), indium Zinc Oxide (IZO), zinc oxide (ZnO), indium oxide (In 2O 3), indium Gallium Oxide (IGO), and Aluminum Zinc Oxide (AZO). For example, a material used for the plurality of pixel anodes 11 includes Indium Tin Oxide (ITO). The material used for the plurality of pixel anodes 11 may also include a metal simple substance and a metal simple substance laminate such as at least one or more of copper Cu, aluminum Al, chromium Cr, and lithium Li.

The pixel defining layer 12 is disposed on a side of the plurality of pixel anodes 11 and the internal planarization layer 10 away from the substrate 110, the pixel defining layer 12 defining a plurality of openings; each opening exposes at least a portion of the plurality of pixel anodes 11. The material used for the pixel defining layer 12 includes at least one of an inorganic insulating material and an organic insulating material, such as silicon nitride (SiNx), silicon oxynitride (SiON), and silicon oxide (SiOx).

Each light emitting functional layer 13 is located in one opening. The plurality of light-emitting functional layers 13 may have a single-layer structure or a multilayer structure. Illustratively, the light emitting functional layer 13 includes only a light emitting layer. Alternatively, the light-emitting functional layer 13 includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer. The material used for the light-emitting functional layer 13 includes an inorganic light-emitting material or an organic light-emitting material. Illustratively, the types of organic luminescent materials are different, as are the colors of the emitted light.

The cathode layer 14 is disposed on a side of the light emitting function layer 13 away from the substrate 110, and the cathode layer 14 extends to a side of the pixel defining layer 12 away from the substrate 110 and covers the pixel defining layer 12. The material used for the cathode layer 14 may include a (semi) transparent layer including at least one or more of silver Ag, magnesium Mg, aluminum Al, platinum Pt, gold Au, nickel Ni, chromium Cr, and lithium Li. For example, the cathode layer 14 may be made of a material including a multi-layered structure formed of a Ti/Al/Ti laminate metal.

Referring again to fig. 5, the display panel 100 further includes a planarization layer 140 and an encapsulation layer 150.

The planarization layer 140 is disposed on a side of the light emitting device stack 102 away from the substrate 110, i.e., the planarization layer 140 is disposed on a side of the plurality of sub-pixels 120 away from the substrate 110, so as to planarize surfaces of the plurality of sub-pixels 120. By way of example, the material used for the planarization layer 140 may include an organic insulating material, or an inorganic and organic insulating material. Illustratively, the organic insulating material includes at least one of general polymers such as polymethyl methacrylate (PMMA) and Polystyrene (PS), polymer derivatives having a phenol group, acryl-based polymers, imide-based polymers, aryl ether-based polymers, amide-based polymers, fluorine-based polymers, para-xylene-based polymers, and vinyl alcohol-based polymers. For example, the material used for the planarization layer 140 includes polyimide.

The encapsulation layer 150 is disposed on a side of the planarization layer 140 away from the substrate 110. The encapsulation layer 150 is configured to insulate the light emitting device and the pixel driving circuit from the attack of water oxygen. The encapsulation layer 150 may include a first inorganic layer, an organic encapsulation layer, and a second inorganic layer, which are sequentially stacked, for example. Wherein the first inorganic layer and the second inorganic layer are configured to block external water oxygen, and the organic encapsulation layer is configured to perform stress release and planarization in the film layer.

In addition, as shown in fig. 5, the display panel 100 further includes a protective cover 180, and the protective cover 180 is disposed at the outermost side in a direction away from the substrate 110 and is configured to protect the underlying film layer. For example, the material of the protective cover 180 includes glass.

In some examples, as shown in fig. 5, the display panel 100 further includes a first light extraction layer 131 and a second light extraction layer 132 disposed on the plurality of sub-pixels 120, the second light extraction layer 132 being farther from the substrate 110 than the first light extraction layer 131.

Illustratively, the refractive index of the first light extraction layer 131 is less than the refractive index of the second light extraction layer 132. In this way, based on the principle that the larger the refractive index is, the smaller the refractive angle is, the probability that the light passing through the first light extraction layer 131 is totally reflected in the second light extraction layer 132 can be reduced, and the light exit efficiency can be improved.

Based on the film layer structure of the display panel 100 shown in fig. 5 (hereinafter, referred to as a light emitting substrate) the present embodiment provides some schemes of specific structures of the first light extraction layer 131 and the second light extraction layer 132 to reduce the problem of reddening of a display image of the display panel 100 observed at a small viewing angle.

Fig. 6 and 7 are cross-sectional views of the display panel of fig. 4 taken along section line C-C. As shown in fig. 6 and 7, the surface of the first light extraction layer 131 adjacent to the second light extraction layer 132 includes a plurality of columnar patterns 1311; at least a portion of the plurality of column patterns 1311 is disposed along an edge of the red subpixel 121.

In some embodiments, as shown in fig. 6, the first light extraction layer 131 includes a pad layer 1312 and a plurality of columnar patterns 1311 disposed on the pad layer 1312, i.e., the pad layer 1312 is a portion of material with uniform thickness that remains after etching the first light extraction layer 131. After the pad layer 1312 of a certain thickness remains in the first light extraction layer 131, the material of the first light extraction layer 131 in the other regions except for the portion of the first light extraction layer 131 where the columnar pattern 1311 needs to be provided (the edge region of the red subpixel 121) remains.

In other embodiments, as shown in fig. 7, the first light extraction layer 131 includes a groove 1313 and a plurality of columnar patterns 1311 located in the groove 1313, i.e., the groove 1313 is formed in a region of the first light extraction layer 131 covering the red subpixel 121, and the plurality of columnar patterns 1311 are formed in the groove 1313.

For example, the plurality of pillar patterns 1311 may be formed by etching the first light extraction layer 131 using a dry etching or a wet etching process.

In the display panel 100, the first light extraction layer 131 and the second light extraction layer 132 are provided, the plurality of columnar patterns 1311 are provided on the surface of the first light extraction layer 131 adjacent to the second light extraction layer 132, and at least part of the columnar patterns 1311 among the plurality of columnar patterns 1311 are provided along the edge of the red subpixel 121. In this way, the columnar pattern 1311 can reflect the small-viewing-angle red light emitted from the red subpixel 121, so that the small-viewing-angle red light is reduced, thereby reducing the intensity of the small-viewing-angle red light; also, the exit direction of the red light reflected by the column pattern 1311 is changed to the normal viewing angle, so that the light of the normal viewing angle increases, thereby increasing the red light intensity of the normal viewing angle. Thus, the brightness matching degree of the red, blue and green sub-pixels 121, 122 and 123 at a small viewing angle is improved, and the redness problem occurring when the image of the display panel 100 is observed at a small viewing angle is eliminated.

The embodiment of the present application mainly reflects the red light emitted from the red subpixel 121, and thus, the dimension of the columnar pattern 1311 along the direction perpendicular to the substrate 110 is set based on the wavelength of the red light and the cavity length and the thickness of the film layer of the light emitting device, so that as much light emitted from the edge of the red subpixel 121 as possible is reflected to the front view angle region.

In some examples, as shown in fig. 8 and 9, at least part of the columnar patterns 1311 of the plurality of columnar patterns 1311 are located outside the light emitting region S of the red subpixel 121 and are spaced around the light emitting region S of the red subpixel 121. The number and the pitch of the plurality of pillar patterns 1311 may be set according to actual requirements. For example, as shown in fig. 8, 18 columnar patterns 1311 are provided outside the light emitting region S of the red subpixel 121, and the pitch between every two adjacent columnar patterns 1311 of the 18 columnar patterns 1311 is equal.

It should be noted that, the light emitting area S of the sub-pixel 120 is exemplarily shown as an area where the sub-pixel 120 is located in the drawing, so as to explain the positional relationship between the sub-pixel 120 and the plurality of columnar patterns 1311.

As illustrated in fig. 8, at least a portion of the columnar pattern 1311 of the plurality of columns 1311 is disposed on the pad layer 1312 and outside the light emitting region of the red subpixel 121, spaced around the light emitting region of the red subpixel 121.

As illustrated in fig. 9, at least a portion of the columnar patterns 1311 of the plurality of columnar patterns 1311 are located within the grooves 1313 and outside the light emitting region of the red subpixel 121, and are spaced around the light emitting region of the red subpixel 121.

The columnar pattern 1311 is disposed outside the light emitting region S of the red sub-pixel 121, and can reflect the light emitted from the edges of the red sub-pixel 121, further reduce the red light intensity of the red sub-pixel 121 under a small viewing angle, and improve the brightness matching degree of the red, green and blue light of the red sub-pixel 121, the blue sub-pixel 122 and the green sub-pixel 123 under the small viewing angle, so as to improve the image display effect of the display panel 100 under the side view angle. The columnar pattern 1311 is disposed outside the light emitting region S of the red subpixel 121, and does not block the light emitted from the light emitting region S of the red subpixel 121, thereby improving the light emitting effect.

In other examples, as shown in fig. 10 and 11, at least part of the columnar patterns 1311 of the plurality of columnar patterns 1311 are located within the light emitting region S of the red subpixel 121 and are disposed near the edge of the light emitting region S of the red subpixel 121.

As illustrated in fig. 10, at least a portion of the columnar pattern 1311 of the plurality of columns 1311 is located on the pad layer 1312, and the pad layer 1312 covers the display area AA. These column patterns 1311 are located within the light emitting region S of the red subpixel 121 and are disposed near the edge of the light emitting region S of the red subpixel 121. Since the first light extraction layer 131 itself can improve light transmission efficiency, the partial columnar pattern 1311 is disposed at the inner edge of the light emitting region S of the red subpixel 121, and can reflect light at the edge of the red subpixel 121 without affecting the light transmission efficiency, and reduce red light intensity of the red subpixel 121 at a small viewing angle, so as to improve image display effect of the display panel 100 at a small viewing angle.

In still other examples, as shown in fig. 11, in the case where the first light extraction layer 131 is provided with grooves 1313 near the surface of the second light extraction layer 132, a part of the columnar patterns 1311 of the plurality of columnar patterns 1311 is located within the grooves 1313, and another part is located within the light emitting region S of the red subpixel 121 and is disposed near the edge of the light emitting region S of the red subpixel 121. In this way, based on the effect that the first light extraction layer 131 itself can improve the light transmission efficiency, in the case that the light emitted from the edge of the red subpixel 121 is generated without passing through the first light extraction layer 131 due to the larger opening of the groove 1313, the plurality of columnar patterns 1311 disposed at the outer edge of the light emitting region S can enable the light emitted from the light emitting region S to be at least partially reflected by the columnar patterns 1311, reduce the red light intensity of the red subpixel 121 at a small viewing angle, improve the brightness matching degree with the blue subpixel 122 and the green subpixel 123 at a small viewing angle of the red subpixel 121, and improve the image display effect of the display panel 100 at a small viewing angle.

The plurality of column patterns 1311 may reflect light transmitted from the red subpixel 121 to the edge. Based on the problem that the light intensity of the red light emitted by the red sub-pixel is strong under the small viewing angle, the light transmitted to the edge by the red sub-pixel 121 is reflected, so that the light intensity emitted by the red sub-pixel 121 under the side viewing angle can be reduced, the matching effect of the light intensities emitted by the red sub-pixel 121, the blue sub-pixel 122 and the green sub-pixel 123 is improved, and the display effect of the image under the small viewing angle is improved.

In some embodiments, as shown in fig. 6 and 7, the first light extraction layer 131 and the second light extraction layer 132 are disposed between the planar layer 140 and the encapsulation layer 150. In this way, after the planarization layer 140 planarizes the surfaces of the plurality of sub-pixels 120, the first light extraction layer 131 is conveniently fabricated; particularly in the case of etching the first light extraction layer 131 to form the plurality of pillar patterns 1311, the planarization layer 140 can function to protect the light emitting devices L in the plurality of subpixels 120.

The second light extraction layer 132 may fill gaps between the plurality of columnar patterns 1311 of the first light extraction layer 131, planarize the surface of the first light extraction layer 131, and facilitate improving uniformity of light transmitted from the first light extraction layer 131 and the second light extraction layer 132, thereby improving uniformity of display brightness.

In other embodiments, fig. 12 and 13 are cross-sectional views of the display panel 100 of fig. 4 along section line C-C. As shown in fig. 12 and 13, the display panel 100 is an OLED display panel formed by adopting COE (color filter on encapsulation) technology, that is, the display panel 100 includes a black matrix 160 and a color film layer 170 disposed on an encapsulation layer 150.

The black matrix 160 is disposed on a side of the encapsulation layer 150 away from the substrate 110; the black matrix 160 includes a plurality of openings 161, and each opening 161 corresponds to the light emitting region S of one sub-pixel 120.

The color film layer 170 includes a plurality of filter patterns 171, and each filter pattern 171 is located in one of the openings 161. Illustratively, in the case where the plurality of subpixels 120 include the red, blue, and green subpixels 121, 122, and 123, the plurality of filter patterns 171 include red, green, and blue filter patterns.

The black matrix 160 and the color film layer 170 are configured to reduce reflected light generated by external light irradiated onto the display panel 100 and stray light emitted from the plurality of sub-pixels 120, so as to improve the image display effect of the display panel 100 under the ambient light.

Based on this, the first light extraction layer 131 and the second light extraction layer 132 are disposed on the sides of the black matrix 160 and the color film layer 170 away from the substrate 110. In this way, the first light extraction layer 131 and the second light extraction layer 132 not only can reflect the light emitted from the sub-pixel 120 to the edge area to the front view angle area, so as to reduce the probability of reddening the display image under the small viewing angle of the sub-pixel; in addition, the light passing through the color film layer 170 can be reflected, so as to reduce the light intensity of the light at the edge of the red filter pattern 171 and reduce the red probability of the display image.

For example, as shown in fig. 12, in the case where the first light extraction layer 131 and the second light extraction layer 132 are disposed on the side of the black matrix 160 and the color film layer 170 away from the substrate 110, the encapsulation layer 150 is disposed on the side of the plurality of sub-pixels 120 away from the substrate 110, and no light extraction layer is disposed between the encapsulation layer 150 and the plurality of sub-pixels 120, the planarization layer 140 in the above example may be omitted to reduce the thickness of the display panel 100 and simplify the manufacturing process.

In still other embodiments, as shown in fig. 13, the display panel 100 includes a first set of first and second light extraction layers 131 and 132, and a second set of first and second light extraction layers 131 'and 132'. The first group of first light extraction layers 131 and the second light extraction layers 132 are disposed between the planarization layer 140 and the encapsulation layer 150. The second group of first light extraction layers 131 'and the second light extraction layers 132' are disposed on the sides of the black matrix 160 and the color film layer 170 away from the substrate 110. Here, the structures of the two groups of light extraction layers may be the same or different, and only the arrangement positions of the two groups of light extraction layers are exemplified, and the specific structures of the light extraction layers may be combined adaptively with reference to the solutions provided in the related embodiments herein.

Through setting up two sets of light extraction layers, first light extraction layer 131 and second light extraction layer 132 of first group are nearer apart from sub-pixel 120, can be with the reflection that the light that the sub-pixel 120 was emergent more to the positive viewing angle region, and, with the combined action of second group first light extraction layer 131 'and second light extraction layer 132', columnar pattern 1311 increases, be favorable to further improving the reflection effect to the light that the sub-pixel 120 was emergent, reduce the red light intensity of red sub-pixel 120 under the small visual angle, reduce the probability that the display image reddening under the small visual angle, and then improve the luminance matching degree of red sub-pixel, blue sub-pixel and green sub-pixel under the small visual angle, improve the image display effect.

In some embodiments, as shown in fig. 13, the orthographic projection of at least a portion of the columnar patterns 1311 of the plurality of columnar patterns 1311 on the substrate 110 does not overlap with the orthographic projection of the light emitting region S of the subpixel 120 on the substrate 110.

As illustrated in fig. 13, the functional film layer between the light emitting device L (not illustrated in the drawing, refer to fig. 5) and the second group of first light extraction layers 131 '(and the second light extraction layers 132') includes a pixel defining layer (not illustrated in the drawing, refer to fig. 5), a black matrix 160, and a color film layer 170.

In the case where the display panel 100 includes two sets of light extraction layers, in a set of light extraction layers (i.e., the second set of the first light extraction layer 131 'and the second light extraction layer 132') on a side of the color film layer 170 away from the substrate 110, the front projections of the partial columnar patterns 1311 on the substrate 110 do not overlap with the front projections of the light emitting regions S of the sub-pixels 120 on the substrate 110.

In this way, based on the principle of the divergent propagation direction of the light, the second group of the first light extraction layer 131 'and the second light extraction layer 132' are disposed at the outermost sides of the functional film layers on the light exit side of the display panel 100 in the direction perpendicular to the substrate 110, and the columnar pattern 1311 can block or reflect the poorly reflected light generated at the boundaries of these functional film layers among the light emitted from the light emitting device L to the front view angle region, reduce the stray light, so that the edge definition of the diffraction pattern is improved, thereby improving the definition of the display image, that is, as shown in fig. 14, the diffraction spot formed by the light emitted from the sub-pixel 120 is converted from the edge blur (as shown in (a) in fig. 14) to the edge clear (as shown in (b) in fig. 14) light spot.

In addition, a plurality of column patterns 1311 may also be disposed at edges of sub-pixels 120 of any color or area among all sub-pixels 120 within the display area AA. And the number or the size of the columnar patterns 1311 is adjusted to adjust the light output intensity of the sub-pixels 120 with different colors, so as to improve the display effect of the image under different viewing angles. As shown in fig. 15 to 20, the shape and arrangement positions of the plurality of columnar patterns 1311 in the depression are exemplarily described. Fig. 15 to 18 are schematic views of columnar patterns 1311 disposed on the pad layer 1312; fig. 19 to 20 are schematic views showing the columnar pattern disposed in the groove 1313.

Illustratively, as shown in fig. 15 and 16, a plurality of column patterns 1311 are provided only at the edges of the red sub-pixel 121. For example, as shown in fig. 15, the columnar pattern 1311 has a rectangular shape in front projection on the substrate 110, and extends in the arrangement direction (first direction X) of the plurality of red subpixels 121. Two columnar patterns 1311 are respectively disposed on two sides of the red sub-pixel 121 along the first direction X, and the two columnar patterns 1311 are orthographic projected on the substrate 110, one overlapping with the orthographic projection of the light emitting region S of the red sub-pixel 121 on the substrate 110, and one being located outside the light emitting region S of the red sub-pixel 121. As another example, as shown in fig. 16, the shape of the orthographic projection of the columnar pattern 1311 on the substrate 110 is a circle. The plurality of column patterns 1311 are disposed on both sides of the red subpixel 121 along the second direction Y and spaced apart from each other. The red subpixel 121 is provided with 12 columnar patterns 1311 along one side of the second direction Y, and the orthographic projection of a part of the columnar patterns 1311 of the 12 columnar patterns 1311 on the substrate 110 overlaps with the orthographic projection of the light emitting region S of the red subpixel 121 on the substrate 110.

Alternatively, a part of the columnar patterns 1311 among the plurality of columnar patterns 1311 is disposed at the edge of the red subpixel 121, and another part of the columnar patterns 1311 is disposed at the edge of the blue subpixel 122.

Alternatively, some of the plurality of columnar patterns 1311 are provided at the edge of the red subpixel 121, and another part of the columnar patterns 1311 are provided at the edge of the green subpixel 123.

Alternatively, as shown in fig. 17 and 18, a part of the columnar patterns 1311 among the plurality of columnar patterns 1311 is provided at the edge of the red subpixel 121, a part of the columnar patterns 1311 is provided at the edge of the blue subpixel 122, and another part of the columnar patterns 1311 is provided at the edge of the green subpixel 123. For example, the columnar pattern 1311 is a long stripe shape. As shown in fig. 17, the plurality of column patterns 1311 includes two types, one on both sides of the red subpixel 121 in the first direction X and the other on both sides of each subpixel 120 in the second direction Y. The red sub-pixels 121 have two columnar patterns 1311 on both sides in the first direction X. And, the two columnar patterns 1311 are orthographic projected on the substrate 110, one overlapping with the orthographic projection of the light emitting region S of the red subpixel 121 on the substrate 110, and one being located outside the light emitting region S of the red subpixel 121. As another example, as shown in fig. 18, the plurality of columnar patterns 1311 includes two types, one on both sides of each sub-pixel 120 along the first direction X and the other on both sides of each sub-pixel 120 along the second direction Y, i.e., the columnar patterns 1311 are staggered in a grid shape. Wherein, each column of red subpixels 121 has two columnar patterns 1311 along two sides of the first direction X.

The above-described arrangement positions of the plurality of column patterns 1311 are only exemplary, and the number and shape of the column patterns 1311 at the edge of each sub-pixel 120 may be set according to actual demands.

Also illustratively, as shown in fig. 19 and 20, the opening of the recess 1313 exposes at least the light-emitting region S of the red subpixel 121. The front projection of the plurality of columnar patterns 1311 on the substrate 110 at least partially overlaps with the front projection of the light emitting region S of the red subpixel 121 on the substrate 110 to reduce the probability that the light emitted from the edge of the subpixel 120 does not pass through or is not reflected by the material of the first light extraction layer 131, thereby improving the adjustment of the light intensity emitted from the red subpixel 121 to improve the display effect.

As an example, as shown in fig. 19, grooves 1313 are provided only in the region where the first light extraction layer 131 covers the red sub-pixel 121, and a plurality of column patterns 1311 are provided at intervals at the edge of the red sub-pixel 121. For example, the shape of the orthographic projection of the columnar pattern 1311 on the substrate 110 is a circle. The red sub-pixel 121 is provided with 4 columnar patterns 1311 along two sides of the first direction X, and the orthographic projection of each columnar pattern 1311 on the substrate 110 overlaps with the orthographic projection of the light emitting region S of the red sub-pixel 121 on the substrate 110.

Alternatively, as shown in fig. 20, grooves 1313 are provided only in the region where the first light extraction layer 131 covers the red subpixel 121. The columnar pattern 1311 has a rectangular shape in orthographic projection on the substrate 110, and is disposed at an edge of the red subpixel 121 along the first direction X. For example, two sides of the red subpixel 121 along the first direction X are respectively provided with a columnar pattern 1311, and the orthographic projections of the two columnar patterns 1311 on the substrate 110 overlap with the orthographic projection portion of the light emitting region S of the red subpixel 121 on the substrate 110.

Alternatively, grooves 1313 are formed in the first light extraction layer 131 in regions covering the red, blue, and green sub-pixels 121, 122, and 123, and a plurality of columnar patterns 1311 are formed at intervals on edges of the red, blue, and green sub-pixels 121, 122, and 123.

In the above-mentioned sub-pixel 120, the shapes and sizes of the red sub-pixel 121, the blue sub-pixel 122 and the green sub-pixel 123 may be the same or different, and may be set according to the actual application scene. Illustratively, in orthographic projection on the substrate 110, the red, blue, and green subpixels 121, 122, 123 are each hexagonal in shape; and, the area of the red sub-pixel 121 is smaller than the area of the blue sub-pixel 122 and larger than the area of the green sub-pixel 123. The plurality of column patterns 1311 may be disposed according to the shape and size of the different subpixels 120.

In some embodiments, as shown in fig. 21, at least one sub-pixel 120 of the plurality of sub-pixels 120 has a size along the first direction X that is greater than a size of the sub-pixel 120 along the second direction Y; the first direction X and the second direction Y are perpendicular to each other and parallel to the substrate 110.

At least some of the columnar patterns 1311 of the plurality of columnar patterns 1311 are located on opposite sides of the sub-pixel 120 in the first direction X, respectively.

It will be appreciated that the diffraction pattern formed by the light rays exiting the sub-pixels 120 is generally elliptical in shape due to the different dimensions of the sub-pixels 120 along the first direction X and the second direction Y. The uniformity of the light intensity of the light emitted from each sub-pixel 120 irradiated to each divergence angle in the elliptical area is weaker than that of the light emitted from each divergence angle in the right circular area, which results in color difference between the color of the light emitted from each sub-pixel 120 and the color of the preset light, and reduces the color matching between the sub-pixels 120 with different colors, thereby resulting in color difference of the display image. For this reason, a plurality of column patterns 1311 are disposed at the edges of the long sides of the sub-pixels 120, and can reflect light rays at the edges of the sub-pixels 120 to the positive viewing angle region, so that the diffraction pattern formed by light rays exiting from the sub-pixels 120 is a positive circle, to improve the image display effect.

For example, the size of the sub-pixel 120 in the first direction X is larger than the size of the sub-pixel 120 in the second direction Y based on the sub-pixel 120 shown in fig. 21. In the case where the columnar patterns 1311 are not provided on opposite sides of the sub-pixel 120 in the first direction X, the diffraction spot shape formed by the outgoing light of the sub-pixel 120 is elliptical (as shown in (a) of fig. 22). In order to adjust the shape of the diffraction pattern to be a perfect circle, a plurality of columnar patterns 1311 are provided at the edge of the short side of the sub-pixel 120 to block part of the light emitting area S of the sub-pixel 120 so that the light emitting area S of the sub-pixel 120 is approximately in a positive direction, and after the plurality of columnar patterns 1311 are provided at opposite sides of the sub-pixel 120 in the first direction X, the diffraction spot shape formed by the outgoing light of the sub-pixel 120 is a perfect circle (as shown in (b) of fig. 22).

In some embodiments, the plurality of pillar patterns 1311 may range in size from 0.7 μm to 10 μm in a direction perpendicular to the substrate 110. Illustratively, the plurality of pillar patterns 1311 have a size of 0.7 μm, 1 μm, 3 μm, 5 μm, or 10 μm in a direction perpendicular to the substrate 110. For example, the plurality of pillar patterns 1311 has a size of 1 μm in a direction perpendicular to the substrate 110.

The columnar pattern 1311 has a trapezoidal or rectangular cross-sectional shape in a direction perpendicular to the substrate 110. For example, the cross-sectional shape of the columnar pattern 1311 in the direction perpendicular to the substrate 110 is a trapezoid, the bottom side of which is close to the sub-pixel 120 with respect to the top side. In this way, the columnar pattern 1311 reduces the amount of light emitted from the edges of the sub-pixels 120 without affecting the light emitting effect of the sub-pixels 120 at the positive viewing angle, improves the color matching degree between the sub-pixels 120 of different colors, and improves the display effect.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

The foregoing is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art who is skilled in the art will recognize that changes or substitutions are within the technical scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims (10)

1. A display panel, comprising:

a substrate;

a plurality of sub-pixels disposed on the substrate, the plurality of sub-pixels including a red sub-pixel, a blue sub-pixel, and a green sub-pixel;

a first light extraction layer and a second light extraction layer disposed on the plurality of subpixels, the second light extraction layer being farther from the substrate than the first light extraction layer;

wherein the surface of the first light extraction layer, which is close to the second light extraction layer, comprises a plurality of columnar patterns; at least a portion of the plurality of columnar patterns is disposed along an edge of the red subpixel.

2. The display panel of claim 1, wherein at least a portion of the plurality of columnar patterns are located outside of and spaced around the light emitting region of the red subpixel.

3. The display panel of claim 1, wherein at least a portion of the plurality of columnar patterns are located within the light emitting region of the red subpixel and are disposed proximate to an edge of the light emitting region of the red subpixel.

4. The display panel of claim 1, wherein at least one of the plurality of subpixels has a dimension in a first direction that is greater than a dimension of the subpixel in a second direction; the first direction and the second direction are mutually perpendicular and parallel to the substrate;

at least part of the columnar patterns are respectively positioned at two opposite sides of the sub-pixel in the first direction.

5. The display panel of claim 1, further comprising:

the flat layer is arranged on one side of the plurality of sub-pixels away from the substrate;

the packaging layer is arranged on one side of the flat layer away from the substrate;

Wherein the first light extraction layer and the second light extraction layer are disposed between the planarization layer and the encapsulation layer.

6. The display panel of claim 1, further comprising:

the packaging layer is arranged on one side of the plurality of sub-pixels, which is far away from the substrate;

the black matrix is arranged on one side of the packaging layer far away from the substrate; the black matrix comprises a plurality of openings, and each opening corresponds to a light-emitting area of one sub-pixel;

the color film layer comprises a plurality of filter patterns, and each filter pattern is positioned in one opening;

the first light extraction layer and the second light extraction layer are arranged on one side of the black matrix and the color film layer, which is far away from the substrate.

7. The display panel according to any one of claims 1 to 6, wherein a refractive index of the first light extraction layer is smaller than a refractive index of the second light extraction layer.

8. The display panel according to any one of claims 1 to 6, wherein a surface of the first light extraction layer adjacent to the second light extraction layer is provided with grooves, and the plurality of columnar patterns are located in the grooves.

9. The display panel according to any one of claims 1 to 6, wherein the second light extraction layer fills gaps between the plurality of columnar patterns.

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

the method comprises the steps of,

and a housing configured to support and protect the display panel.