CN109545824B

CN109545824B - Display screen, display device and working method thereof

Info

Publication number: CN109545824B
Application number: CN201811365873.7A
Authority: CN
Inventors: 卜倩倩; 王丹; 邱云; 孙晓; 胡伟频
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Priority date: 2018-11-16
Filing date: 2018-11-16
Publication date: 2021-02-26
Anticipated expiration: 2038-11-16
Also published as: CN109545824A

Abstract

The invention provides a display screen, a display device and a working method thereof, belongs to the technical field of display, and can meet different application requirements of users. Wherein, the display screen includes: an OLED display substrate; and each sub-pixel of the electrowetting display substrate corresponds to at least one sub-pixel of the OLED display substrate. The technical scheme of the invention is used for meeting different application requirements of users.

Description

Display screen, display device and working method thereof

Technical Field

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

Background

The existing display device often cannot meet different application requirements of users, for example, the reflective electrowetting display device is very suitable for displaying under strong light, but can only display in an environment with light, and cannot display in a weak light or dark environment; the OLED display device can display in a weak light or dark environment, but has low brightness and is not suitable for displaying in a strong light.

Disclosure of Invention

The invention aims to provide a display screen, a display device and a working method thereof, which can meet different application requirements of users.

To solve the above technical problem, embodiments of the present invention provide the following technical solutions:

in one aspect, a display screen is provided, including:

an OLED display substrate;

and each sub-pixel of the electrowetting display substrate corresponds to at least one sub-pixel of the OLED display substrate.

Furthermore, the sub-pixels of the electrowetting display substrate correspond to the sub-pixels of the OLED display substrate one to one.

Further, the electrowetting display substrate comprises:

a first substrate;

a first electrode on the first substrate;

the hydrophobic medium layer is positioned on the first electrode;

a second substrate disposed opposite the first substrate;

a second electrode on the second substrate;

the retaining wall is positioned between the second electrode and the hydrophobic medium layer and defines a plurality of sub-pixel areas;

a colored ink and a transparent polar fluid located in each subpixel area.

Further, the OLED display substrate includes:

a substrate base plate;

a thin film transistor array layer on the substrate base plate;

a planarization layer covering the thin film transistor array layer;

an anode on the planarization layer;

a pixel defining layer on the planar layer, the pixel defining layer defining a plurality of sub-pixel regions;

a light emitting layer located in each of the sub-pixel regions;

a transparent cathode;

and (7) packaging the layer.

Further, the first electrode is electrically connected to the anode.

Further, the light emitting layer is a white light emitting layer.

Further, the encapsulation layer is multiplexed into the first substrate.

The embodiment of the invention also provides a display device which comprises the display screen.

The embodiment of the invention also provides a working method of the display device, which is applied to the display device and comprises the following steps:

when the intensity of the external light is greater than a preset threshold value, controlling the electrowetting display substrate to display;

and when the intensity of the external light is not greater than a preset threshold value, controlling the OLED display substrate to display.

Further, the OLED display substrate is a white OLED display substrate, and when the intensity of the external light is not greater than a preset threshold value, the controlling of the OLED display substrate to display includes:

and when the intensity of the external light is not greater than a preset threshold value, controlling the colored ink of the electrowetting display substrate to be in a flat state, and simultaneously controlling the OLED display substrate to display.

The embodiment of the invention has the following beneficial effects:

in the scheme, the OLED display substrate is combined with the electrowetting display substrate, so that when the device works indoors or in an environment with very dark light, the OLED display substrate can be used for displaying; when the display device works outdoors or in an environment with strong light, the display device can display by utilizing the electrowetting display substrate, can meet the use requirements under different use environments, and realizes low power consumption and light, thin and portable display.

Drawings

FIG. 1 is a schematic diagram of a first buffer layer and a second buffer layer after formation according to an embodiment of the invention;

FIG. 2 is a schematic diagram illustrating an active layer formed according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a gate, a source and a drain after forming the gate, the source and the drain according to the embodiment of the invention;

FIG. 4 is a schematic representation of an OLED device after formation according to an embodiment of the present invention;

FIG. 5 is a schematic representation of an embodiment of the present invention after forming a colored ink;

FIG. 6 is a schematic view of an upper substrate after forming an embodiment of the present invention;

FIG. 7 is a schematic diagram of a display screen according to an embodiment of the present invention in a relatively high-light environment;

fig. 8 is a schematic diagram of a display screen according to an embodiment of the present invention displaying in a weak light environment.

Reference numerals

1 lower substrate

2 first buffer layer

3 second buffer layer

4 polycrystalline silicon layer

5 source/drain contact region

6 gate insulating layer

7 grid electrode

8 interlayer insulating layer

9 source and drain electrodes

10 passivation layer

11 Anode

12 pixel definition layer

13 OLED light-emitting layer

14 transparent cathode

15 thin film encapsulation layer

16 electrowetting display driving electrode

17 hydrophobic medium layer

18 retaining wall

19 colored ink

20 transparent polar fluid

21 transparent electrode

22 upper substrate

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The embodiment of the invention provides a display screen, a display device and a working method thereof, aiming at the problem that a display device in the prior art cannot meet different application requirements of a user frequently, and can meet different application requirements of the user.

An embodiment of the present invention provides a display screen, including:

an OLED display substrate;

In the embodiment, the OLED display substrate is combined with the electrowetting display substrate, so that when the device works indoors or in an environment with very dark light, the OLED display substrate can be used for displaying; when the display device works outdoors or in an environment with strong light, the display device can display by utilizing the electrowetting display substrate, can meet the use requirements under different use environments, and realizes low power consumption and light, thin and portable display.

The sub-pixels of the electrowetting display substrate can correspond to the sub-pixels of the plurality of OLED display substrates, and the sub-pixels of the electrowetting display substrate can be in one-to-one correspondence with the sub-pixels of the OLED display substrates.

In one embodiment, the electrowetting display substrate comprises:

a first substrate;

a first electrode on the first substrate;

the hydrophobic medium layer is positioned on the first electrode;

a second substrate disposed opposite the first substrate;

a second electrode on the second substrate;

a colored ink and a transparent polar fluid located in each subpixel area.

In one embodiment, the OLED display substrate includes:

a substrate base plate;

a thin film transistor array layer on the substrate base plate;

a planarization layer covering the thin film transistor array layer;

an anode on the planarization layer;

a light emitting layer located in each of the sub-pixel regions;

a transparent cathode;

and (7) packaging the layer.

Furthermore, the first electrode of the electrowetting display substrate is electrically connected with the anode of the OLED display substrate, so that a driving signal wire connected with the first electrode and a driving signal wire connected with the anode do not need to be respectively arranged, the anode and the first electrode can share the driving signal wire, the structure of the display screen can be simplified, and the cost of the display screen is reduced.

Since the colored ink of the electrowetting display substrate can serve as a color filter layer, the OLED display substrate does not need to perform color display, and the light emitting layer can be a white light emitting layer.

Furthermore, the packaging layer is reused as the first substrate, so that the thickness of the display screen can be reduced, and the cost of the display screen can be reduced.

The embodiment of the invention also provides a display device which comprises the display screen. The display device may be: the display device comprises a television, a display, a digital photo frame, a mobile phone, a tablet personal computer and any other product or component with a display function, wherein the display device further comprises a flexible circuit board, a printed circuit board and a back plate.

Specifically, the preset threshold may be 800 lux.

Specifically, the OLED display substrate is a white OLED display substrate, and when the intensity of the external light is not greater than a preset threshold, controlling the OLED display substrate to display includes:

The technical scheme of the invention is further described by combining the drawings and specific embodiments:

electrowetting display is a low-power consumption reflective display technology, is mainly applied to outdoor reading, and has the display principle that: when no voltage is applied, the colored ink is uniformly paved on the electrowetting display substrate; after voltage is applied, the transparent polar fluid extrudes the colored ink under the action of an electric field, so that the colored ink is gathered at the corners of the electrowetting display substrate. The contact angle of the colored ink and the transparent polar fluid can be controlled by controlling the applied voltage, so that different gray scale display is realized. The display structure of a common electrowetting display substrate is an RGB tiled structure, and the specific structure is that sub-pixels of each primary color are tiled, sub-pixels of R, G, B primary colors form a display pixel, and then a plurality of pixels form an electrowetting display substrate. The color ink of the sub-pixel is driven by the corresponding driving voltage generated by the modulation of the corresponding primary color data by the gray modulator to expand and contract to display the colors with different brightness, and the sub-pixels of the three primary colors realize color display by adding spatial color mixing. The reflective electrowetting display substrate realizes display under the control of polar liquid in an electrified state, so that the reflective electrowetting display substrate has higher response speed compared with other reflective display devices, can realize high brightness, high contrast and low energy consumption, and is very suitable for display under strong light. But can only display in the environment with light, but cannot display in the environment with weak light or dark.

The OLED display substrate is formed by fabricating an OLED device on a TFT (thin film transistor) circuit, controlling each sub-pixel to self-emit light through the TFT circuit, and realizing gray scale by brightness (or partial brightness) of the sub-pixel itself. The OLED display substrate has low power consumption, wide working temperature and high response speed, but has low display brightness and is not suitable for reading environment under the sunlight condition.

The embodiment provides a display screen with a composite structure, which can display by using an OLED display substrate when working indoors or in an environment with very dark light; when the display device works outdoors or in an environment with strong light, the display device can display by utilizing the electrowetting display substrate, can meet the use requirements under different use environments, and realizes low power consumption and light, thin and portable display.

The manufacturing method of the display screen of the embodiment comprises the following steps:

step 1, as shown in fig. 1, providing a lower substrate 1, and fabricating a first buffer layer 2 and a second buffer layer 3 on the lower substrate 1, wherein the first buffer layer 2 is a silicon nitride film system to achieve the effects of blocking water and oxygen and blocking alkaline ions; the second buffer layer 3 is a silicon oxide film system for improving the interface defect of the active layer and enhancing the electron transport property.

And 2, forming an active layer. Deposition of an amorphous silicon thin film is performed on the second buffer layer 3. The thickness and defects of amorphous silicon need to be strictly controlled to avoid mura after ELA (excimer laser annealing) process. Then crystallizing the amorphous silicon film by ELA process, completing laser continuous scanning irradiation of the amorphous silicon film under the condition of specific wavelength and specific laser intensity, and carrying out melting and recrystallization processes to form a polycrystalline silicon layer 4, wherein the diameter of polycrystalline silicon grains is 0.3-0.5 μm. And etching the polysilicon layer 4 to form a pattern of an active layer. Then, as shown in fig. 2, deposition of the gate insulating layer 6 is performed. The gate insulating layer 6 is preferably a silicon oxide film, and may be a silicon oxide/silicon nitride stack.

And 3, forming a grid electrode, a source electrode and a drain electrode. As shown in fig. 3, a gate metal layer is formed on the gate insulating layer 6, and the gate metal layer is patterned to form a gate electrode 7. And then doping the polysilicon layer 4 by taking the grid electrode 7 as a mask to form a heavily doped source/drain contact region 5.

An interlayer insulating layer 8 is formed, a source drain metal layer is formed on the interlayer insulating layer 8, and the source drain metal layer is patterned to form a source electrode and a drain electrode 9.

A passivation layer 1 is formed.

And 4, forming the OLED device as shown in FIG. 4.

Specifically, a reflective anode layer is deposited on the passivation layer 10, and the reflective anode layer may be a stacked ITO/Ag structure, and is patterned to form the anode 11 of the OLED device.

Forming a pixel defining material layer, patterning the pixel defining material layer to form a pattern of the pixel defining layer 12, the pixel defining layer 12 defining a plurality of sub-pixel regions.

Forming an OLED light emitting layer 13 in the sub-pixel region, wherein the OLED light emitting layer 13 is a white light emitting layer, and then performing evaporation on the transparent cathode 14.

And forming a thin film packaging layer 15 to finish the manufacture of the white light OLED device.

Step 5, as shown in fig. 5, making colored ink 19;

after the thin film encapsulation layer 15 is fabricated, a via hole exposing the anode 11 is formed by punching the non-subpixel region.

A conductive layer is formed on the thin film encapsulation layer 15, the conductive layer is patterned to form an electrowetting display driving electrode 16 (i.e., the first electrode described above), and the electrowetting display driving electrode 16 is connected to the anode 11 through a via hole.

A hydrophobic dielectric layer 17 of a hydrophobic transparent amorphous fluoropolymer such as AF1600 is formed on the electrowetting display driving electrode 16.

And a retaining wall 18 is formed on the hydrophobic medium layer 17, and the retaining wall 18 defines a sub-pixel area of the electrowetting display substrate, so that the color crosstalk problem of the colored ink of the adjacent sub-pixels can be avoided.

Colored ink 19 is formed in the sub-pixels defined by the banks 18, and the colored ink 19 includes red ink, blue ink, and green ink.

Step 6, as shown in fig. 6, the upper substrate 22 and the lower substrate 1 are aligned.

An upper substrate 22 is provided, a transparent conductive layer is formed on the upper substrate 22, and the transparent conductive layer is patterned to form a transparent electrode 21 (i.e., the second electrode).

The upper substrate 22 and the lower substrate 1 are aligned to form a cavity. And injecting the transparent polar fluid 20 into the cavity between the upper substrate 22 and the lower substrate 1 to complete the manufacture of the display screen.

When the display screen works, firstly, external light is monitored, as shown in fig. 7, when the external light is bright, a driving circuit of the electrowetting display substrate is turned on, voltage is applied to the transparent electrode 21 and the electrowetting display driving electrode 16, no electric signal is applied to the transparent cathode 14 of the OLED display substrate, an electric field between the transparent electrode 21 and the electrowetting display driving electrode 16 can control the flow of the transparent polar fluid 20, and further surface tension between the hydrophobic dielectric layer 17 and the transparent polar fluid 20 can be adjusted, the distribution position of the colored ink 19 is controlled, so that colors with different brightness are displayed, and display under strong light is realized.

As shown in fig. 8, when the external light is dark, the driving circuit of the OLED display substrate is turned on, the electric signal is applied to the transparent cathode 14 and the anode 11, and the electric signal is not applied to the transparent electrode 21 of the electrowetting display substrate, so that the colored ink 19 is in a tiled state. The white light which is emitted by the OLED display substrate and carries different gray information can form red light, green light and blue light with different gray scales through the colored ink 19 with different colors, so that a full-color display effect can be achieved, and the display under the environment with dark light is realized.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A display screen, comprising:

an OLED display substrate;

each sub-pixel of the electrowetting display substrate corresponds to at least one sub-pixel of the OLED display substrate;

the electrowetting display substrate comprises:

a first substrate;

a first electrode on the first substrate, the first electrode being electrically connected to an anode of the OLED display substrate;

the hydrophobic medium layer is positioned on the first electrode;

a second substrate disposed opposite the first substrate;

a second electrode on the second substrate;

colored ink and a transparent polar fluid in each subpixel area;

wherein the first electrode and the second electrode are oppositely arranged.

2. The display screen of claim 1, wherein the subpixels of the electrowetting display substrate correspond one-to-one with the subpixels of the OLED display substrate.

3. The display screen of claim 1, wherein the OLED display substrate comprises:

a substrate base plate;

a thin film transistor array layer on the substrate base plate;

a planarization layer covering the thin film transistor array layer;

an anode on the planarization layer;

a light emitting layer located in each of the sub-pixel regions;

a transparent cathode;

and (7) packaging the layer.

4. A display screen as recited in claim 3, wherein the light-emitting layer is a white light-emitting layer.

5. The display screen of claim 3, wherein the encapsulation layer is multiplexed into the first substrate.

6. A display device, characterized in that it comprises a display screen according to any one of claims 1-5.

7. An operating method of a display device, applied to the display device according to claim 6, the operating method comprising:

8. The operating method of the display device according to claim 7, wherein the OLED display substrate is a white OLED display substrate, and the controlling the OLED display substrate to display when the intensity of the external light is not greater than the preset threshold value comprises: