CN115148925A

CN115148925A - Display device

Info

Publication number: CN115148925A
Application number: CN202110345396.3A
Authority: CN
Inventors: 林昌廷; 孙明晓; 刘晓伟; 高上
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-10-04

Abstract

The invention discloses a display device, comprising: the array substrate comprises an array substrate and a plurality of sub-pixel units; the sub-pixel unit includes: the reflection layer in the sub-pixel unit of at least one color is a super-surface reflection layer, the super-surface reflection layer can modulate the phase of reflected light when reflecting incident light, so that light of a specific color can be extracted from white light emitted by the white organic light emitting diode device, and light of different colors can be extracted by adjusting the parameters of the super-surface reverse layer aiming at sub-pixel units of different colors, so that the display device can realize color display. The super-surface reflecting layer not only avoids the problems of huge light loss, power consumption increase and device aging acceleration of an organic light-emitting diode device caused by using a color filter, but also is beneficial to reducing photon coupling in the optical waveguide effect by using the microcavity effect, and improves the luminous efficiency, the color purity and the brightness of the display device.

Description

Display device

Technical Field

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

Background

Compared with a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED) Display has the advantages of high color saturation, lightness, thinness, flexibility and the like, and is highly regarded by the fields of Display and illumination.

Currently, the organic light emitting diode device display devices are mainly classified into two types, which are: display devices comprising multicolored OLED devices, and display devices comprising white OLED devices in combination with color filters. The display device comprising the OLED devices with various colors is mainly prepared by using a fine metal mask plate. However, the fine metal mask plate cannot meet the preparation requirement of ultrahigh resolution, and cannot prepare a large-size OLED display device due to size limitation. Therefore, the current large-sized OLED display device mainly adopts a structure of a white OLED device in combination with a filter. However, the use of optical filters results in significant optical losses (> 70%) in OLED devices, leading to increased device power consumption and accelerated device aging.

Disclosure of Invention

In some embodiments of the present invention, a display device includes: the array substrate comprises an array substrate and a plurality of sub-pixel units; the sub-pixel unit includes: the reflection layer in the sub-pixel unit of at least one color is a super-surface reflection layer, the super-surface reflection layer can modulate the phase of reflected light when reflecting incident light, so that light of a specific color can be extracted from white light emitted by the white organic light emitting diode device, and light of different colors can be extracted by adjusting the parameters of the super-surface reverse layer aiming at sub-pixel units of different colors, so that the display device can realize color display. The super-surface reflecting layer is arranged in the display device to realize color display, so that the problems of increased power consumption and accelerated aging of the device caused by huge light loss of an organic light-emitting diode device due to the use of a color filter are solved, the microcavity effect is facilitated to reduce photon coupling in the optical waveguide effect, and the luminous efficiency, the color purity and the brightness of the display device are improved.

In some embodiments of the invention, the super-surface reflective layer comprises: a columnar nano silver array and a flat layer. The columnar nano silver array is composed of a plurality of columnar nano silver regularly arranged, the method for preparing the columnar nano silver array is a nano-imprinting method, and the columnar nano silver in the super-surface reflecting layer is uniformly distributed to play a role in adjusting the phase of reflected light. The flat layer is used for protecting the columnar nano silver array and flattening the surface.

In some embodiments of the invention, the width of the columnar nano silver in the columnar nano silver array is 20-300nm, the height of the columnar nano silver is 20-300nm, and the distance between the central points of two adjacent columnar nano silver is 50-200nm.

In some embodiments of the present invention, the sub-pixel units of multiple colors comprise: the pixel structure comprises a blue sub-pixel unit, a green sub-pixel unit and a red sub-pixel unit; the first reflecting layer, the second reflecting layer and the third reflecting layer respectively corresponding to the blue sub-pixel unit, the green sub-pixel unit and the red sub-pixel unit are super-surface reflecting layers. The distance between the central points of two adjacent columnar nano-silver in the first reflecting layer is greater than that between the central points of two adjacent columnar nano-silver in the second reflecting layer; the distance between the central points of two adjacent columnar nano-silver in the second reflecting layer is greater than the distance between the central points of two adjacent columnar nano-silver in the third reflecting layer. The first reflecting layer, the second reflecting layer and the third reflecting layer are all super-surface reflecting layers, so that the thicknesses of the white organic light emitting diode devices in the whole display device can be the same, and the further reduction of the thicknesses of the white organic light emitting diode devices is facilitated, and the display device is lighter and thinner.

In some embodiments of the present invention, the first reflective layer corresponding to the blue sub-pixel unit is a specular reflective layer, and the second reflective layer and the third reflective layer corresponding to the green sub-pixel unit and the red sub-pixel unit are super-surface reflective layers, respectively. The distance between the central points of the two adjacent columnar nano-silver layers in the second reflecting layer is greater than the distance between the central points of the two adjacent columnar nano-silver layers in the third reflecting layer. The first reflecting layer is a mirror reflecting layer, so that the blue sub-pixel unit follows the traditional microcavity effect, all white organic light emitting diode devices are manufactured according to the cavity length of the blue sub-pixel unit, and then the distribution density of the columnar nano silver in the super-surface reflecting layers of the red sub-pixel unit and the green sub-pixel unit is adjusted, so that the red sub-pixel unit emits red light and the green sub-pixel unit emits green light.

In some embodiments of the present invention, the width of the columnar nano silver in the super-surface reflective layer of the green sub-pixel unit is 100nm, the height of the columnar nano silver is 80nm, and the distance between the central points of two adjacent columnar nano silver is 330nm; the width of the columnar nano silver in the super-surface reflecting layer of the red sub-pixel unit is 100nm, the height of the columnar nano silver is 80nm, and the distance between the central points of two adjacent columnar nano silver is 330nm.

In some embodiments of the present invention, the specular reflective layer is made of silver.

In some embodiments of the present invention, the display device further comprises: the nano-particle layer is composed of nano-particles which are irregularly arranged, the shape and the size of the nano-particle layer are the same as those of the spacing layer, the size range of the nano-particles is 50-100nm, and the nano-particle layer is made of silver or gold. The nano particle layer obviously improves the internal and external quantum efficiency of the organic light-emitting diode device, inhibits the efficiency roll-off of the organic light-emitting diode device and improves the stability of the display device.

In some embodiments of the present invention, the display device further comprises: the color film layer comprises color film units with various colors, the color film units correspond to the sub-pixel units with the same color, and the color film layer can further purify light rays with different colors corresponding to the sub-pixel units, so that the display effect of the display device is improved. The light shielding layer can prevent light crosstalk among the sub-pixel units, so that the display effect of the display device is improved.

In some embodiments of the present invention, the display device further includes a bragg reflective layer, the bragg reflective layer including a plurality of bragg reflective units; the Bragg reflection unit is used for transmitting the emergent light of the sub-pixel unit with the corresponding color and reflecting the emergent light of the sub-pixel units with other colors, and the Bragg reflection layer can further purify the light with different colors corresponding to the sub-pixel units, so that the display effect of the display device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present 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 partial cross-sectional view of a display device according to an embodiment of the invention;

fig. 2 is a schematic view illustrating a local light propagation process of a display device according to an embodiment of the present invention;

FIG. 3a is a schematic cross-sectional view of a super-surface reflection layer according to an embodiment of the present invention;

FIG. 3b is a top view of a super surface reflection layer provided in an embodiment of the present invention;

fig. 4 is a second schematic partial cross-sectional view of a display device according to an embodiment of the invention;

fig. 5 is a third schematic partial cross-sectional view illustrating a display device according to an embodiment of the invention;

FIG. 6 is a fourth schematic partial cross-sectional view of a display device according to an embodiment of the present invention;

FIG. 7 is a fifth partial cross-sectional view of a display device according to an embodiment of the present invention;

fig. 8 is a sixth schematic partial sectional view of a display device according to an embodiment of the invention.

The organic light emitting diode display device comprises an array substrate 11, a sub-pixel unit 12, a spacing layer 13, a nanoparticle layer 14, an encapsulation layer 15, a color film layer 16, a shading layer 17, a substrate 18, a Bragg reflection layer 19, a columnar nano silver array 20, a flat layer 21, an encapsulation cover plate 30, a substrate 111, a driving circuit layer 112, a blue sub-pixel unit 12-1, a green sub-pixel unit 12-2, a red sub-pixel unit 12-3, a reflection layer 121, a white organic light emitting diode device 122, a first reflection layer 1211, a second reflection layer 1212, a third reflection layer 1213, a functional layer 1220, a first electrode e1, a second electrode e2, a blue color film unit 161, a green color film unit 162, a red color film unit 163, a blue Bragg reflection unit 191, a green Bragg reflection unit 192, and a red Bragg reflection unit 193.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.

The OLED display device has the advantages of being light, thin, high in brightness, low in power consumption, fast in response, high in definition, good in flexibility, high in luminous efficiency and the like, and occupies an increasingly important position in the display field.

The light emitting device in the OLED display device is an OLED device. The OLED device includes an anode, a light emitting layer, and a cathode. The anode, the light-emitting layer and the cathode form a sandwich structure, after an electric field is generated between the anode and the cathode, electrons and holes can move to the light-emitting layer and are combined into excitons in the light-emitting layer, and the excitons excite light-emitting molecules to finally generate visible light.

At present, the OLED display device is mainly classified into two types, one is a display device including red, green and blue OLEDs, and subpixels of the display device are manufactured by using a fine mask plate, but a manufacturing method using the fine mask plate cannot meet the manufacturing requirement of ultra-high resolution, and cannot manufacture a large-sized OLED display panel due to size limitation.

The display device solves the problems that the preparation method using the fine mask plate cannot achieve ultrahigh resolution and cannot prepare a large-size display panel, but the mode of using the color filter plate causes huge light loss of an OLED device, so that the power consumption of the device is increased and the aging of the device is accelerated.

In view of the above, embodiments of the present invention provide a display apparatus, which not only avoids the problems of increased power consumption and accelerated aging of an organic light emitting diode device due to the huge light loss caused by using a color filter, but also improves the light emitting efficiency, color purity and brightness of the display apparatus.

Fig. 1 is a schematic partial cross-sectional view of a display device according to an embodiment of the present invention.

Referring to fig. 1, the display device includes: array substrate 11, a plurality of sub-pixel unit 12.

The array substrate 11 includes: a substrate base 111 and a drive line layer 112.

The substrate 111 is located at the bottom of the display device and has a bearing function. The shape of the base substrate 111 is rectangular or square, including the top side, the ground side, the left side, and the right side. Wherein the top side is opposite to the ground side, the left side is opposite to the right side, the top side is respectively connected with one end of the left side and one side of the right side, and the ground side is respectively connected with the other end of the left side and the other end of the right side.

The size of the substrate base 111 is adapted to the size of the display device, and generally, the size of the substrate base 111 is slightly smaller than the size of the display device.

In the embodiment of the invention, the substrate 111 is made of glass, and the substrate 111 is made of glass with high thermal conductivity coefficient, so that heat generated by the display device during display can be quickly dissipated, and the problem of reduction of luminous efficiency caused by overhigh temperature is avoided.

The driving line layer 112 is located on the substrate 111, and the driving line layer 112 includes a driving element for driving the white organic light emitting diode device to emit light and a signal line. The driving line layer 112 provided in the embodiment of the present invention may be prepared by using a Thin Film Transistor (TFT) manufacturing process.

The driving line layer 112 is composed of a plurality of metal layers and insulating layers, and a circuit composed of driving elements such as thin film transistors, capacitors, and resistors having a specific connection relationship is formed by patterning the metal layers and the insulating layers. After the driving circuit layer 112 is electrically connected to the white organic light emitting diode device, a driving signal may be provided to the white organic light emitting diode device by the driving circuit layer 112 to control the white organic light emitting diode device to emit light.

The plurality of sub-pixel cells 12 include sub-pixel cells of a plurality of colors, the sub-pixel cells of the plurality of colors including: a blue sub-pixel element 12-1, a green sub-pixel element 12-2 and a red sub-pixel element 12-3.

The sub-pixel unit 12 includes: a reflective layer 121 and a white organic light emitting diode device 122.

The reflective layer 121 is disposed on the driving circuit layer 112, and the reflective layer 121 includes a first reflective layer 1211, a second reflective layer 1212, and a third reflective layer 1213; the first reflective layer 1211 corresponds to the blue sub-pixel unit 12-1, the second reflective layer 1212 corresponds to the green sub-pixel unit 12-2, and the third reflective layer 1213 corresponds to the red sub-pixel unit 12-3.

The white organic light emitting diode device 122 includes: a first electrode e1, a functional layer 1220, and a second electrode e2.

The first electrode e1 is disposed on the reflective layer 121 and corresponds to the positions of the blue sub-pixel unit 12-1, the green sub-pixel unit 12-2, and the red sub-pixel unit 12-3, respectively, and the first electrode e1 is electrically connected to the driving line layer 112 for transmitting a driving signal provided by the driving line layer 112 to the white organic light emitting diode device to control the light emitting luminance of the white organic light emitting diode device in the areas of the blue sub-pixel unit 12-1, the green sub-pixel unit 12-2, and the red sub-pixel unit 12-3, respectively.

In the embodiment of the present invention, the material used for the first electrode e1 is indium tin oxide, which is a transparent conductive material.

The functional layer 1220 is located on the first electrode e1, and has a size and a shape consistent with those of the array substrate 11, and the functional layer 1220 may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer, where the light emitting layer emits light under the control of a driving signal, and the emitted light is white light.

The second electrode e2 is located on the functional layer 1220, and the size and shape of the second electrode e2 are consistent with those of the functional layer 1220.

In the first reflective layer 1211, the second reflective layer 1212, and the third reflective layer 1213 provided in this embodiment of the present invention, at least one of the reflective layers is a super-surface reflective layer, and the super-surface reflective layer can modulate a phase of reflected light when reflecting an incident light, so that light of a specific color can be extracted from white light emitted by the white organic light emitting diode device 122, and light of different colors can be extracted by adjusting parameters of a super-surface reverse layer for sub-pixel units of different colors, so that the display device can implement color display.

According to the embodiment of the invention, the super-surface reflecting layer is arranged in the display device to realize color display, so that the problems of increased power consumption and accelerated aging of the device caused by huge light loss of an organic light-emitting diode device due to the use of a color filter are solved, the microcavity effect is facilitated to reduce photon coupling in the optical waveguide effect, and the luminous efficiency, the color purity and the brightness of the display device are improved.

Fig. 2 is a schematic view of a local light propagation process of the display device according to the embodiment of the invention.

Referring to FIG. 2, the dotted line represents the propagation process of light, the resonant wavelength λ andreflected phase of reflected light

The following relationship is satisfied:

wherein,

indicating the reflected phase of the light ray at d,

denotes a reflection phase of a light ray at b, L denotes a reflection cavity length, λ resonance wavelength (wavelength of light extracted in white light emitted from the white organic light emitting diode device 122), and n and m denote natural constants.

In the process of transmitting light in the blue sub-pixel unit 12-1, the green sub-pixel unit 12-2 and the red sub-pixel unit 12-3, the phases of the light waves in the processes of a, c and d are the same, but in the process of b, the reflection phases of the three are caused by the super-surface reflection layer

The change occurs, so that the wavelength of light finally emitted in the sub-pixel units of three colors is different, and the color of the finally emitted light is different. The method for preparing the red, green and blue sub-pixels by utilizing the super-surface reflecting layer solves the problem that a fine metal mask plate in the traditional evaporation OLED cannot prepare high pixel density, and the super-surface reflecting layer is beneficial to further narrowing the spectrum and improving the light emitting efficiency of the device.

In addition, the embodiment of the invention can control the reflection phase at the position b when the phases of the light waves at the positions a, c and d are constant

To further control the length L of the reflective cavity, and from the above formula, the reflection phase can be improved

The length L of the reflective cavity is shortened, so that the display device is thinner.

Fig. 3a is a schematic cross-sectional structure diagram of a super-surface reflection layer according to an embodiment of the present invention. Fig. 3b is a top view of the super surface reflection layer provided in the embodiment of the present invention.

Referring to fig. 3a and 3b, the super surface reflection layer includes: a columnar nano silver array 20 and a flat layer 21.

The columnar nano silver array 20 is positioned on the driving circuit layer 112, the columnar nano silver array 20 is composed of a plurality of columnar nano silver which are regularly arranged, the method for preparing the columnar nano silver array 20 provided by the embodiment of the invention is a nano-imprinting method, and the columnar nano silver in the super-surface reflecting layer is uniformly distributed to play a role in adjusting the phase of reflected light.

The width of the columnar nano silver in the columnar nano silver array 20 provided by the embodiment of the invention is 20-300nm, the height of the columnar nano silver is 20-300nm, and the distance between the central points of two adjacent columnar nano silver is 50-200nm.

And the flat layer 21 is positioned on the surface of the side, away from the driving circuit layer 112, of the columnar nano silver array 20, and is used for protecting the columnar nano silver array 20 and simultaneously flattening the surface, so that the first electrode e1 can be manufactured on the flat layer. The columnar nano silver array 20 and the flat layer 21 comprise through holes, the first electrode e1 is electrically connected with the driving circuit layer 112 through the through holes, and after the columnar nano silver array 20 is prepared, the flat layer 21 is prepared above the columnar nano silver array 20 by using a spin coating method.

The material used for the planarization layer 21 is an organic material such as epoxy resin, acrylic resin, or silicone resin, and is not limited herein.

As shown in fig. 1, in an implementation manner, the first reflective layer 1211, the second reflective layer 1212, and the third reflective layer 1213 respectively corresponding to the blue sub-pixel unit 12-1, the green sub-pixel unit 12-2, and the red sub-pixel unit 12-3 are all super-surface reflective layers.

The greater the distribution density of the columnar nano-silver in the columnar nano-silver array 20, the greater the provided reflection phase, and the greater the wavelength of the finally emitted light.

The distance between the center points of two adjacent columnar nano-silver in the first reflective layer 1211 is greater than the distance between the center points of two adjacent columnar nano-silver in the second reflective layer 1212; the distance between the center points of two adjacent pillar-shaped nano silver in the second reflective layer 1212 is greater than the distance between the center points of two adjacent pillar-shaped nano silver in the third reflective layer 1213.

Specifically, the width of the columnar nano silver in the second reflective layer 1212 provided in the embodiment of the present invention is 100nm, the height of the columnar nano silver is 80nm, and the distance between the center points of two adjacent columnar nano silver is 330nm; the width of the columnar nano silver in the third reflective layer 1213 is 100nm, the height of the columnar nano silver is 80nm, and the distance between the central points of two adjacent columnar nano silver is 330nm.

The first reflective layer 1211, the second reflective layer 1212, and the third reflective layer 1213 provided in the embodiments of the present invention are all super surface reflective layers, so that the thicknesses of the white organic light emitting diode devices in the entire display device can be the same, and the thickness of the white organic light emitting diode devices can be further reduced, so that the display device is thinner and thinner.

Fig. 4 is a second schematic partial cross-sectional view of a display device according to an embodiment of the invention.

Referring to fig. 4, the first reflective layer 1211 corresponding to the blue sub-pixel unit 12-1 is a specular reflective layer, and the second reflective layer 1212 and the third reflective layer 1213 corresponding to the green sub-pixel unit 12-2 and the red sub-pixel unit 12-3, respectively, are super-surface reflective layers.

The distance between the center points of two adjacent pillar-shaped nano silver in the second reflective layer 1212 is greater than the distance between the center points of two adjacent pillar-shaped nano silver in the third reflective layer 1213.

Specifically, the first reflective layer 1211 provided in the embodiment of the present invention is a silver reflective layer coated on the entire surface; the width of the columnar nano silver in the second reflecting layer 1212 is 100nm, the height of the columnar nano silver is 80nm, and the distance between the central points of two adjacent columnar nano silver is 330nm; the width of the columnar nano silver in the third reflective layer 1213 is 100nm, the height of the columnar nano silver is 80nm, and the distance between the central points of two adjacent columnar nano silver is 330nm.

The first reflective layer 1211 provided in the embodiment of the present invention is a mirror reflective layer, so that the blue sub-pixel unit 12-1 follows a microcavity effect in a conventional sense, all white organic light emitting diode devices are fabricated according to the cavity length of the blue sub-pixel unit 12-1, and the distribution density of the columnar nano-silver in the super surface reflective layers of the red sub-pixel unit 12-3 and the green sub-pixel unit 12-2 is adjusted, so as to achieve the purpose of emitting red light from the red sub-pixel unit 12-3 and emitting green light from the green sub-pixel unit 12-2.

In the actual manufacturing process, the physical cavity length of the blue sub-pixel unit 12-1 is 135nm, the emission wavelength of the blue sub-pixel unit 12-1 is 450nm, the emission wavelength of the green sub-pixel unit 12-2 is 540nm, and the emission wavelength of the red sub-pixel unit 12-3 is 620nm.

Fig. 5 is a third schematic partial sectional view of a display device according to an embodiment of the invention.

Referring to fig. 5, the display device provided in the embodiment of the present invention further includes: a spacer layer 13, a nanoparticle layer 14 and an encapsulation layer 15.

The spacer layer 13 is located on the second electrode e2, and has the same shape and size as the second electrode e2, the thickness of the spacer layer 13 is in a range of 20-50nm, in the embodiment of the present invention, the spacer layer 13 is an organic material layer, and the organic material layer may include acrylic resin, epoxy resin or silicone resin, which is not limited herein.

The nanoparticle layer 14 is composed of irregularly arranged nanoparticles, the shape and size of the nanoparticle layer 14 is the same as those of the spacer layer 13, the size range of the nanoparticles is 50-100nm, and the nanoparticles are made of silver or gold in the embodiment of the present invention.

The nanoparticle layer 14 significantly improves the internal and external quantum efficiency of the organic light emitting diode device, suppresses the roll-off in efficiency of the organic light emitting diode device, and improves the stability of the display device.

The encapsulation layer 15 is located on the surface of the nanoparticle layer 14 on the side away from the spacer layer 13, and the encapsulation layer 15 is used for encapsulating the organic light-emitting diode device, preventing oxygen or water in the air from causing oxidation corrosion to elements in the organic light-emitting diode device, and protecting the nanoparticle layer 14 from being damaged.

In the embodiment of the present invention, the encapsulation layer 15 is a stacked structure, and includes an inorganic encapsulation layer, an organic buffer layer and an inorganic encapsulation layer from bottom to top.

Fig. 6 is a fourth schematic partial cross-sectional view of a display device according to an embodiment of the invention.

Referring to fig. 6, the display device provided in the embodiment of the present invention further includes: the packaging layer 15, the color film layer 16 and the light shielding layer 17.

The encapsulation layer 15 is located on a surface of the second electrode e2 facing away from the functional layer 1220, and the encapsulation layer 15 is used for encapsulating the organic light emitting diode device and preventing oxygen or water in the air from causing oxidation corrosion to elements in the organic light emitting diode device.

In the embodiment of the present invention, the encapsulation layer 15 is a stacked structure, and includes, from bottom to top, an inorganic encapsulation layer, an organic buffer layer, and an inorganic encapsulation layer.

The color film layer 16 is located on the encapsulation layer 15, and the color film layer 16 includes color film units of multiple colors, in an embodiment of the present invention, the color film units of multiple colors include: the color filter display device comprises a blue color filter unit 161, a green color filter unit 162 and a red color filter unit 163, wherein the blue color filter unit 161 corresponds to the blue sub-pixel unit 12-1, the green color filter unit 162 corresponds to the green sub-pixel unit 12-2, the red color filter unit 163 corresponds to the red sub-pixel unit 12-3, and the color filter layer 16 can further purify light rays with different colors corresponding to the sub-pixel units, so that the display effect of the display device is improved.

The light shielding layer 17 is located on the encapsulation layer 15 and at an interval between the color film units, and the light shielding layer 17 can prevent light crosstalk between the sub-pixel units, so that the display effect of the display device is improved.

In the present embodiment, the material used for the light-shielding layer 17 is black resin.

Fig. 7 is a fifth partial cross-sectional structure diagram of a display device according to an embodiment of the invention.

Referring to fig. 7, the display device provided in the embodiment of the present invention further includes a package cover 30, where the package cover 30 includes: color film layer 16, light shielding layer 17 and substrate 18.

The encapsulation cover plate 30 is located on a side of the second electrode e2 away from the functional layer 1220, a preset distance is spaced between the encapsulation cover plate 30 and the second electrode e2, and the encapsulation cover plate 30 is used for encapsulating and protecting the organic light emitting diode device.

The color film layer 16 and the light shielding layer 17 are located on the substrate 18, and the color film unit in the color film layer 16 corresponds to the sub-pixel unit with the corresponding color.

The material used for the substrate 18 in the present embodiment is glass.

Referring to fig. 8, the display device provided in the embodiment of the present invention further includes: an encapsulation layer 15 and a bragg reflector layer 19.

The encapsulation layer 15 is the same as the encapsulation layer set in fig. 6, and the description thereof is omitted.

The bragg reflection layer 19 is located on the packaging layer 15, and the bragg reflection layer 19 comprises a plurality of bragg reflection units; the Bragg reflection unit is used for transmitting the emergent light of the sub-pixel unit with the corresponding color and reflecting the emergent light of the sub-pixel units with other colors.

Specifically, the plurality of bragg reflection units include: the pixel structure comprises a blue Bragg reflection unit 191, a green Bragg reflection unit 192 and a red Bragg reflection unit 193, wherein the blue Bragg reflection unit 191 corresponds to the position of the blue sub-pixel unit 12-1, the green Bragg reflection unit 192 corresponds to the position of the green sub-pixel unit 12-2, and the red Bragg reflection unit 193 corresponds to the position of the red sub-pixel unit 12-3; the blue bragg reflection unit 191 is used for transmitting blue light and reflecting light rays of other colors except for blue, the green bragg reflection unit 192 is used for transmitting green light and reflecting light rays of other colors except for green, the red bragg reflection unit 193 is used for transmitting red light and reflecting light rays of other colors except for red, and the bragg reflection layer 19 can further purify light rays of different colors corresponding to sub-pixel units, so that the display effect of the display device is improved.

In the embodiment of the present invention, the bragg reflection layer 19 is formed by alternately stacking dielectric layers with different refractive indexes, the number of dielectric layers and the refractive index of the medium used by the blue bragg reflection unit 191, the green bragg reflection unit 192, and the red bragg reflection unit 193 may be set according to needs, and the specific used dielectric material and the number of dielectric layers are not limited herein.

According to the first invention concept, at least one of the first reflective layer, the second reflective layer and the third reflective layer is a super-surface reflective layer, and the super-surface reflective layer can modulate the phase of the reflected light when reflecting the incident light, so that light of a specific color can be extracted from white light emitted by the white organic light emitting diode device, and light of different colors can be extracted by adjusting the parameters of the super-surface reverse layer for sub-pixel units of different colors, so that the display device can realize color display.

According to the second inventive concept, the super-surface reflecting layer realizes color display, thereby avoiding the problems of increased power consumption and accelerated aging of the device caused by huge light loss of the organic light-emitting diode device due to the use of a color filter, being beneficial to reducing the coupling of photons in the optical waveguide effect by the microcavity effect, and improving the luminous efficiency, the color purity and the brightness of the display device.

According to the third inventive concept, in the process of transmitting light in the blue sub-pixel unit, the green sub-pixel unit and the red sub-pixel unit, the phases of the light waves in the a, c and d processes are the same, but in the b process, the reflection phases of the three sub-pixel units are changed due to the super surface reflection layer, so that the light wavelength finally emitted in the sub-pixel units of the three colors is different, and the color of the finally emitted light is different. The method for preparing the red, green and blue sub-pixels by utilizing the super-surface reflecting layer solves the problem that a fine metal mask plate in the traditional evaporation OLED cannot prepare high pixel density, and the super-surface reflecting layer is beneficial to further narrowing the spectrum and improving the light emitting efficiency of the device.

According to the fourth inventive concept, when the phases of the light waves at a, c and d are constant, the length of the reflective cavity is further controlled by controlling the reflection phase at b, and the length of the reflective cavity can be shortened by increasing the reflection phase, so that the display device is thinner and lighter.

According to a fifth inventive concept, a super-surface reflective layer includes: a columnar nano silver array and a flat layer. The columnar nano silver array consists of a plurality of columnar nano silver regularly arranged, the method for preparing the columnar nano silver array is a nano imprinting method, and the columnar nano silver in the super-surface reflecting layer is uniformly distributed to play a role in adjusting the phase of reflected light.

According to the sixth inventive concept, the width of the columnar nano silver in the nano silver array is 20-300nm, the height of the columnar nano silver is 20-300nm, and the distance between the central points of two adjacent columnar nano silver is 50-200nm.

According to the seventh inventive concept, the first reflective layer, the second reflective layer and the third reflective layer respectively corresponding to the blue sub-pixel unit, the green sub-pixel unit and the red sub-pixel unit are super-surface reflective layers. The distance between the central points of two adjacent columnar nano-silver in the first reflecting layer is greater than that between the central points of two adjacent columnar nano-silver in the second reflecting layer; the distance between the central points of two adjacent columnar nano-silver in the second reflecting layer is greater than the distance between the central points of two adjacent columnar nano-silver in the third reflecting layer. The first reflecting layer, the second reflecting layer and the third reflecting layer are all super-surface reflecting layers, so that the thicknesses of the white organic light emitting diode devices in the whole display device can be the same, and the further reduction of the thicknesses of the white organic light emitting diode devices is facilitated, and the display device is lighter and thinner.

According to the eighth inventive concept, the first reflective layer corresponding to the blue sub-pixel unit is a specular reflective layer, and the second reflective layer and the third reflective layer corresponding to the green sub-pixel unit and the red sub-pixel unit are super-surface reflective layers, respectively. The distance between the central points of two adjacent columnar nano-silver in the second reflecting layer is greater than the distance between the central points of two adjacent columnar nano-silver in the third reflecting layer. The first reflecting layer is a mirror reflecting layer, so that the blue sub-pixel unit follows the traditional microcavity effect, all white organic light emitting diode devices are manufactured according to the cavity length of the blue sub-pixel unit, and then the distribution density of columnar nano silver in the super-surface reflecting layers of the red sub-pixel unit and the green sub-pixel unit is adjusted, so that the red sub-pixel unit emits red light, and the green sub-pixel unit emits green light.

According to the ninth inventive concept, the display apparatus further includes: the nano-particle layer is composed of nano-particles which are irregularly arranged, the shape and the size of the nano-particle layer are the same as those of the spacing layer, the size range of the nano-particles is 50-100nm, and the nano-particle layer is made of silver or gold. The nano particle layer obviously improves the internal and external quantum efficiency of the organic light-emitting diode device, inhibits the efficiency roll-off of the organic light-emitting diode device and improves the stability of the display device.

According to the tenth inventive concept, the display apparatus further includes: the color film layer comprises color film units with various colors, the color film units correspond to the sub-pixel units with the same color, and the color film layer can further purify light rays with different colors corresponding to the sub-pixel units, so that the display effect of the display device is improved. The light shielding layer can prevent light crosstalk among the sub-pixel units, so that the display effect of the display device is improved.

According to the eleventh inventive concept, the display device further includes a bragg reflective layer including a plurality of bragg reflective units; the Bragg reflection unit is used for transmitting the emergent light of the sub-pixel unit with the corresponding color and reflecting the emergent light of the sub-pixel units with other colors, and the Bragg reflection layer can further purify the light with different colors corresponding to the sub-pixel units, so that the display effect of the display device is improved.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A display device, comprising:

the array substrate is used for providing a driving signal;

a plurality of sub-pixel units positioned on the array substrate; the sub-pixel units comprise sub-pixel units of multiple colors:

the sub-pixel unit includes:

the reflecting layer is positioned on the array substrate;

the white organic light emitting diode device is positioned on one side, away from the array substrate, of the reflecting layer;

the reflection layer in the sub-pixel unit of at least one color is a super-surface reflection layer, and the super-surface reflection layer is used for modulating the phase of reflected light.

2. The display device of claim 1, wherein the super surface reflective layer comprises:

the columnar nano silver array is positioned on the array substrate;

and the flat layer is positioned on the surface of one side of the columnar nano silver array, which deviates from the array substrate.

3. The display device according to claim 2, wherein the width of the columnar nano silver in the columnar nano silver array is 20-300nm, the height of the columnar nano silver is 20-300nm, and the distance between the central points of two adjacent columnar nano silver is 50-200nm.

4. The display device of claim 3, wherein the plurality of color sub-pixel cells comprise: the pixel structure comprises a blue sub-pixel unit, a green sub-pixel unit and a red sub-pixel unit;

the reflecting layers in the blue sub-pixel unit, the green sub-pixel unit and the red sub-pixel unit are super-surface reflecting layers;

the distance between the central points of two adjacent columnar nano-silver in the super-surface reflecting layer of the blue sub-pixel unit is greater than the distance between the central points of two adjacent columnar nano-silver in the super-surface reflecting layer of the green sub-pixel unit; the distance between the central points of two adjacent columnar nano-silver in the super-surface reflection layer of the green sub-pixel unit is greater than the distance between the central points of two adjacent columnar nano-silver in the super-surface reflection layer of the red sub-pixel unit.

5. The display device of claim 3, wherein the plurality of color sub-pixel cells comprises: the pixel structure comprises a blue sub-pixel unit, a green sub-pixel unit and a red sub-pixel unit;

the reflecting layer in the blue sub-pixel is a mirror reflecting layer; the reflecting layers in the green sub-pixel unit and the red sub-pixel unit are super-surface reflecting layers;

the distance between the central points of two adjacent columnar nano-silver in the super-surface reflection layer of the green sub-pixel unit is greater than the distance between the central points of two adjacent columnar nano-silver in the super-surface reflection layer of the red sub-pixel unit.

6. The display device according to claim 4 or 5, wherein the width of the columnar nano silver in the super-surface reflection layer of the green sub-pixel unit is 100nm, the height of the columnar nano silver is 80nm, and the distance between the central points of two adjacent columnar nano silver is 330nm;

the width of the columnar nano silver in the super-surface reflecting layer of the red sub-pixel unit is 100nm, the height of the columnar nano silver is 80nm, and the distance between the central points of two adjacent columnar nano silver is 330nm.

7. The display device according to claim 5, wherein the specular reflective layer is made of silver.

8. The display device of claim 1, further comprising:

the spacing layer is positioned on one side, away from the array substrate, of the sub-pixel units;

a nanoparticle layer on a side of the spacer layer facing away from the sub-pixel cells; the nanoparticle layer is for improving quantum efficiency of the white organic light emitting diode device.

9. The display device of claim 1, further comprising:

the color film layer is positioned on one side, away from the array substrate, of the sub-pixel units; the color film layer comprises color film units of multiple colors, and the color film units correspond to the positions of the sub-pixel units with the same color.

10. The display device of claim 1, further comprising:

the Bragg reflection layer is positioned on one side of the sub-pixel unit, which is far away from the array substrate; the Bragg reflection layer comprises a plurality of Bragg reflection units; the Bragg reflection unit is used for transmitting emergent light of the sub-pixel unit with the corresponding color and reflecting emergent light of sub-pixel units with other colors.