CN113805379A - Display screen, manufacturing method and device thereof, display method and device and medium - Google Patents
Display screen, manufacturing method and device thereof, display method and device and medium Download PDFInfo
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
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Abstract
本公开是关于一种显示屏及其制备方法、装置、显示方法及装置和介质；其中，所述显示屏，包括：背光模组，包括：至少一个发射白光的白色有机发光二极管WOLED灯；液晶显示面板，位于所述背光模组的上方，用于基于所述背光模组发射的白光进行显示。如此，通过WOLED灯来作为背光源发出白光，可以降低显示屏的曲度限制，也节约了显示屏的制作成本。
The present disclosure relates to a display screen and its preparation method, device, display method, device and medium; wherein, the display screen includes: a backlight module, including: at least one white organic light-emitting diode WOLED lamp emitting white light; liquid crystal A display panel, located above the backlight module, is used for displaying based on the white light emitted by the backlight module. In this way, by using the WOLED lamp as a backlight source to emit white light, the curvature limitation of the display screen can be reduced, and the production cost of the display screen can also be saved.
Description
Technical Field
The disclosure relates to the technical field of display, and in particular to a display screen, a manufacturing method and device thereof, a display method and device thereof, and a medium.
Background
In order to provide a more elegant visual experience for users, each large mobile phone brand is pursuing a full-screen or high-occupancy screen ratio. In addition to the conventional reduction of the size of the bezel of the mobile phone, it is also a common practice to increase the screen occupation ratio by a curved screen. However, at present, the manufacturing cost of the curved screen is much higher than that of a Liquid Crystal Display (LCD), and it is a trend to realize the curved surface directly on the basis of the LCD. However, the curved-surface LCD has high requirements for the backlight source, and the conventional backlight source has many problems in manufacturing cost, thickness, curvature or light emitting effect, which results in failure to achieve a good display effect.
Disclosure of Invention
The disclosure provides a display screen, a manufacturing method and device thereof, a display method and device and a medium.
According to a first aspect of the embodiments of the present disclosure, there is provided a display screen including:
backlight module, including: at least one White Organic Light Emitting Diode (WOLED) lamp emitting white light;
and the liquid crystal display panel is positioned above the backlight module and used for displaying based on the white light emitted by the backlight module.
Optionally, the backlight module is: the flexible backlight module can be bent;
the liquid crystal display panel is as follows: a flexible liquid crystal display panel capable of being bent.
Optionally, the method may be characterized in that,
the backlight module and the liquid crystal display panel are fixed by optical transparent adhesive.
Optionally, the WOLED lamp comprises:
a positive electrode for providing a positive voltage;
a negative electrode for providing a negative voltage;
a carrier providing layer located between the positive electrode and the negative electrode, for providing electrons moving to the positive electrode under the action of voltage between the positive electrode and the negative electrode, and holes moving to the negative electrode under the action of voltage between the positive electrode and the negative electrode;
a first color light emitting layer between the negative electrode and the carrier providing layer, for emitting a first color light based on excitons formed by combination of electrons and holes and attenuation occurring during transition of the excitons;
a second color light emitting layer between the positive electrode and the carrier supplying layer, for emitting a second color light based on an exciton formed by combination of a hole and an electron and upon decay occurring during transition of the exciton;
wherein the light of the first color and the light of the second color are mixed to form white light.
Optionally, the first color light emitting layer, the carrier providing layer and the second color light emitting layer in the WOLED lamp are located between the cathode and the anode, and are stacked in sequence from top to bottom or from bottom to top;
the white light is obtained by mixing the light of the second color emitted by the second color light-emitting layer and the light of the first color after passing through the first color light-emitting layer; or the light of the first color emitted by the first color light emitting layer is mixed with the light of the second color after passing through the second color light emitting layer to obtain the white light.
Optionally, the liquid crystal display panel includes:
the color filter is positioned above the backlight module and used for filtering the white light emitted by the backlight module into red, green, blue, RGB (red, green, blue) monochromatic light required by sub-pixels contained in each pixel;
wherein the area of the color filter sheet is larger than the areas of the first color light-emitting layer and the second color light-emitting layer.
According to a second aspect of the embodiments of the present disclosure, there is provided a method for manufacturing a display screen, the method including:
assembling at least one organic light emitting diode WOLED lamp emitting white light to form a backlight module;
covering a liquid crystal display panel on the backlight module to obtain the display screen; the liquid crystal display panel is used for displaying based on the white light.
Optionally, the method further comprises:
and the backlight module and the liquid crystal display panel are adhered through an optical transparent adhesive tape.
According to a third aspect of the embodiments of the present disclosure, there is provided a display method applied to the display screen of any one of the first aspects, including:
emitting white light through at least one organic light emitting diode WOLED lamp in a backlight module of the display screen;
and the liquid crystal display panel of the display screen displays based on the white light.
Optionally, the method further comprises:
the first color light emitting layer of the WOLED lamp emits a first color light based on excitons formed by the combination of electrons and holes, and upon the decay occurring during the exciton transition;
the second color light emitting layer of the WOLED lamp emits a second color light based on excitons formed by the combination of electrons and holes, and upon the decay occurring during the exciton transition;
wherein the light of the first color and the light of the second color are mixed to form white light.
Optionally, the emitting white light by at least one organic light emitting diode WOLED lamp in the backlight module of the display screen includes:
the light of the second color emitted by the second color light-emitting layer is mixed with the light of the first color to obtain the white light after passing through the first color light-emitting layer; or the light of the first color emitted by the first color light emitting layer is mixed with the light of the second color after passing through the second color light emitting layer to obtain the white light.
Optionally, the method further comprises:
and filtering the white light emitted by the backlight module into red, green, blue, RGB (red, green, blue) monochromatic light required by sub-pixels contained in each pixel through a color filter sheet in a liquid crystal display panel of the display screen.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a manufacturing apparatus of a display screen, including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: the method of any of the second aspects above is implemented when executable instructions stored in the memory are executed.
According to a fifth aspect of the embodiments of the present disclosure, there is provided a display device including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: the method of any of the above third aspects is implemented when executing executable instructions stored in the memory.
According to a sixth aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having instructions stored thereon which, when executed by a processor of a device for preparing a display screen, enable the device for preparing a display screen to perform the method of any one of the second aspects above;
and/or, when executed by a processor of a display device, enable the display device to perform the method of any of the above third aspects.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the embodiment of the disclosure uses at least one white organic light emitting diode WOLED lamp as a backlight module of a display screen to emit white light, so that a liquid crystal display panel positioned above the WOLED lamp can realize display based on the white light emitted by the backlight module. Thus, by using the WOLED as the backlight source of the display screen, the characteristics of the WOLED which is an organic light-emitting device can be utilized, and compared with an inorganic crystal layer in the existing lamp tube, the WOLED has a bending space due to the existence of gaps among particle compositions of organic materials; and the organic film is thinner in thickness relative to the inorganic crystal layer, so that the thickness of the device can be lower. The light emitting characteristics of the organic light emitting device make it easy to implement and is beneficial to large-scale application. In addition, the manufacturing cost and the production cost of the WOLED lamp are relatively low, and the manufacturing cost of the display screen is also saved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of a backlight module.
Fig. 2 is a first schematic diagram illustrating a structure of a display screen according to an exemplary embodiment.
Fig. 3 is a first schematic structural diagram of a WOLED lamp according to an exemplary embodiment.
Fig. 4 is a schematic structural diagram ii of a WOLED lamp according to an exemplary embodiment.
Fig. 5 is a schematic structural diagram of a display screen according to an exemplary embodiment.
Fig. 6 is a flowchart illustrating a method of manufacturing a display panel according to an exemplary embodiment.
FIG. 7 is a flow diagram illustrating a display method according to an example embodiment.
FIG. 8 is a block diagram illustrating a display device or display screen preparation apparatus according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
To realize a curved LCD, the backlight is an extremely important part. Fig. 1 is a schematic view of a backlight module, and as shown in fig. 1, the backlight module includes: light guide plate, Light Emitting Diode (LED), reflector, upper diffuser, lower diffuser, and prism sheet. As most of materials are membranes, the membranes have strong rebound resilience and cannot pass a signal tolerance test, and the bent part and the light guide plate are difficult to process, so that the bent part is difficult to manufacture. If the diaphragm needs to be fixed more firmly, the diaphragm needs to be fixed with a wider width, which conflicts with the narrow frame of the mobile phone at the present stage. If the backlight module with the structure needs to have small curvature, the light with bent side edges is easy to generate the phenomenon of uneven optical surfaces such as dark corners and the like due to the problem of light paths, or the light entering area has obvious hot spots.
In order to reduce the curvature limitation and the manufacturing cost of the backlight source and also reduce the thickness on the basis of a good light emitting effect of the display screen, an embodiment of the present disclosure provides a display screen, and fig. 2 is a schematic structural diagram of a display screen according to an exemplary embodiment, as shown in fig. 2, the display screen includes:
the backlight module 201 includes: at least one White Organic Light Emitting Diode (WOLED) lamp emitting white light;
and the liquid crystal display panel 202 is positioned above the backlight module and used for displaying based on the white light emitted by the backlight module.
It should be noted that the display screen can be applied to various electronic devices that need to display information, and the electronic devices include: smart phones, tablet computers, notebook computers, smart watches, or the like.
The display screen is used for realizing a color display effect, and may be a display screen based on a red, green and blue RGB pixel array, where RGB is called three primary colors of color light, and different colors may be mixed by using the three color lights, so as to realize the color display effect. The lcd panel 202 itself is transparent and does not emit light, and the backlight module is disposed below the lcd panel to realize display.
The WOLED lamp refers to an Organic Light-emitting diode (OLED) emitting White Light (White). In the embodiment of the present disclosure, the WOLEDs may be multiple ones, and are made in the form of a light bar or a light matrix, and the light bar or the light matrix on which the WOLEDs are mounted may be a flexible circuit board, thereby providing flexibility.
The WOLED Lamp in the embodiment of the present disclosure may be composed of one small particle, and may have a relatively large bending capability due to the existence of the gap between the particles, thereby breaking through the curvature limitation, compared to the structural feature of a Cold Cathode Fluorescent Lamp (CCFL) serving as a Lamp source, which is in a strip shape and is not bent.
In some embodiments, the WOLED is composed of a substrate, a cathode, an anode, and a light emitting layer, wherein the substrate is used for carrying all functional layers (such as the light emitting layer), and can be made of glass or plastic. Here, when plastic is used as a material of the substrate, a bendable flexible WOLED device can be manufactured due to the softness of the plastic.
The WOLED can be made into a monochromatic light emitting device, namely, monochromatic light, such as red light or blue light, can be directly emitted; color mixing can also be achieved by the superposition of light emitting layers emitting light of different colors, so that colors of different requirements can be obtained. For example, emission of white light is realized by superimposing light emitting layers emitting three colors of red, green, and blue, or superimposing light emitting layers of 2 complementary colors of blue and yellow.
Since white light requires a mixture of red, green, and blue light, or a mixture of blue and yellow light, in order to emit white light in the disclosed embodiment, the WOLED lamp needs to include at least two light emitting layers. Specifically, the WOLED lamp may be an OLED device including a red light emitting layer, a green light emitting layer, and a blue light emitting layer, and white light obtained by mixing red light emitted from the red light emitting layer, green light emitted from the green light emitting layer, and blue light emitted from the blue light emitting layer is emitted to provide a liquid crystal display panel to display based on the white light. The WOLED lamp may also be an OLED device including a yellow light emitting layer and a blue light emitting layer, and white light obtained by mixing yellow light emitted from the yellow light emitting layer and blue light emitted from the blue light emitting layer is emitted to provide a liquid crystal display panel to display based on the white light.
In some embodiments, the WOLED lamp may further include only one light emitting layer, and light emitted from the light emitting layer may be converted into white light by the phosphor. For example, blue light emitted from the blue light emitting layer passes through the yellow phosphor to obtain white light.
In consideration of the thickness of the smartphone, the light emitting layer in the WOLED lamp may be set to 2 layers in the embodiment of the present disclosure, that is, an OLED device including a yellow light emitting layer and a blue light emitting layer is used to fabricate a WOLED.
It should be noted that, in the WOLED lamp, electrons and holes can move only under the driving of a low driving voltage, and then combine in the light emitting layer to form excitons, and then emit light based on the decay of the excitons during the transition process. This makes it possible to use WOLED lamps as backlights for display screens, due to their relative ease of implementation. Besides, the optical film layer in the OLED is an organic plastic film, so that the organic plastic film is thinner, has better flexibility, can realize larger bending radius, and is lighter and has better flexibility.
In this way, the backlight module 201 serves as a backlight source to emit white light, so that the lcd panel 202 above the backlight module can display information based on the white light.
The disclosed embodiments emit white light through at least one White Organic Light Emitting Diode (WOLED) lamp as a backlight module of a display screen, so that a liquid crystal display panel positioned above the WOLED lamp can realize display based on the white light emitted by the backlight module. Therefore, by using the WOLED as the backlight source of the display screen, the advantage that the WOLED can realize a larger bending radius can be utilized to reduce the curvature limitation of the display screen. Moreover, the manufacturing cost and the production cost of the WOLED lamp are relatively low, and the manufacturing cost of the display screen is also saved.
In some embodiments, the backlight module is: the flexible backlight module can be bent;
the liquid crystal display panel is as follows: a flexible liquid crystal display panel capable of being bent.
As described above, to realize a curved LCD, the curvature limitation of the backlight is an urgent problem to be solved. The WOLED lamp is used as the backlight module, and the WOLED lamp is made of the organic plastic film, so that the organic plastic film is thinner, better in flexibility and capable of achieving larger bending radius, and is lighter and better in flexibility.
Besides, the substrate of the WOLED lamp can be made of glass or plastic. If plastics are used for the manufacture, the more flexible nature of the plastics can be exploited, which can further reduce the limitation on the curvature.
Based on this, the flexible backlight module that can buckle can be the WOLED lamp that the base plate adopted plastics to make. The bending is that the backlight module can reduce the limitation on the curvature and realize larger bending.
Correspondingly, in order to realize better combination degree with the liquid crystal display panel, the liquid crystal display panel also needs to be a flexible liquid crystal display panel capable of being bent on the basis that the backlight module is a flexible backlight module capable of being bent. The flexible liquid crystal display panel can be made of flexible materials, for example, a plastic substrate is selected as an array substrate and a Color Filter (CF) sheet substrate of the liquid crystal display panel, so that the flexibility of the liquid crystal display panel is realized.
So, for the curvature requirement of more laminating curved screen, the flexible backlight unit that adopts to buckle in this disclosed embodiment cooperatees with the flexible liquid crystal display face that can buckle, realizes buckling the display screen that can be bigger, provides better visual experience for the user.
In some embodiments, the backlight module and the liquid crystal display panel are fixed by an optical transparent adhesive.
It should be noted that the optically transparent adhesive is an adhesive for adhering the optically transparent member. Its refractive index is similar to that of optical transparent element, and its light transmittance is good and possesses a certain toughness.
In the fixing between the backlight module and the liquid crystal display panel, if the backlight module is made of the film material shown in fig. 1, the problems of layer-to-layer splitting, refractive index and the like need to be considered in the manufacturing process; and the diaphragm materials are adhered by shading glue, the periphery of the frame is fixed by adhesive tapes, and if the diaphragm is made into a curved surface, the diaphragm and the light guide plate are also fixed, so that the manufacturing is complicated.
Due to the characteristics of the organic film used by the WOLED lamp, the backlight module and the liquid crystal display panel can be attached and fixed by using the optical transparent adhesive as a medium, so that the WOLED lamp is simple and convenient to implement. And the display screen can be manufactured only by coating the optical transparent adhesive on the WOLED lamp and then placing the liquid crystal display panel, the problem of fixing the membrane material is not needed to be considered, the manufacturing is simplified, and the requirements of production and application can be met more.
In some embodiments, fig. 3 is a schematic structural diagram of a WOLED lamp according to an exemplary embodiment, as shown in fig. 3, the WOLED lamp 300 includes:
a positive electrode 301 for supplying a positive voltage;
a negative electrode 302 for providing a negative voltage;
a carrier supply layer 303, located between the positive electrode 301 and the negative electrode 302, for supplying electrons moving to the positive electrode under the action of voltage between the positive electrode and the negative electrode, and holes moving to the negative electrode under the action of voltage between the positive electrode and the negative electrode;
a first color light emitting layer 304 located between the negative electrode 302 and the carrier supplying layer 303, for emitting a first color light based on excitons formed by combination of electrons and holes and attenuation occurring during transition of the excitons;
a second color light emitting layer 305 located between the cathode 301 and the carrier supply layer 303, for emitting a second color light based on excitons formed by combination of holes and electrons and decay occurring during transition of the excitons;
wherein the light of the first color and the light of the second color are mixed to form white light.
It should be noted that, the positive electrode 301 can make the positively charged holes move toward the negative electrode direction under the action of voltage, and correspondingly, the negative electrode 302 can also make the negatively charged electrons move toward the positive electrode direction under the action of voltage.
The carrier supply layer 303 can be considered as a charge generation layer capable of generating charges under positive and negative driving voltages. The exciton is a complex in an excited state, and emits light of a certain color after being attenuated during transition. Specifically, since the excitons are extremely unstable, they are transited to the ground state, and energy is released in the form of light during the transition, thereby realizing light emission. Since one electron and one hole are combined to obtain one exciton, if a plurality of pairs of electrons and holes are available to obtain a plurality of excitons, more light can be emitted when the plurality of excitons transit, and the brightness of light can be improved. Thus, the control of the intensity of light can be realized by controlling the carrier providing layer 303 and the positive and negative voltages to generate more charges.
The carrier supply layer 303 may be composed of a P-type semiconductor and an N-type semiconductor since electrons and holes are to be supplied at the same time. The P-type semiconductor is mainly a positively charged hole conduction semiconductor, and the N-type semiconductor is mainly a negatively charged electron conduction semiconductor.
The placement of the P-type semiconductor and the N-type semiconductor may be: when the cathode is uppermost as shown in fig. 3, the P-type semiconductor is disposed over the N-type semiconductor, so that the first color light emitting layer can form excitons based on the combination of electrons of the cathode and holes provided by the P-type semiconductor, and then decay to emit light during transition. If the anode is uppermost, the N-type semiconductor is disposed above the P-type semiconductor.
As shown in fig. 3, since the carrier supply layer 303 needs to supply electrons moving to the positive electrode 301 and holes moving to the negative electrode 302 under the voltage action between the positive electrode 301 and the negative electrode 302, on the first color light emitting layer 304, light is emitted based on the transition of excitons formed by the electrons moving from the negative electrode 302 and the holes supplied from the carrier supply layer 303 being combined, and the first color light emitting layer 304 is located between the negative electrode 302 and the carrier supply layer 303. Based on the same principle, the second color light emitting layer 305 also needs to be located between the positive electrode 301 and the carrier providing layer 303 to realize the transition of forming excitons by the combination of the holes moved from the positive electrode 301 and the electrons provided by the carrier providing layer 303 and emit light.
In the disclosed embodiment, in order to emit white light, the first color light may be yellow or blue, and the second color light may be blue or yellow. That is, when the first color light is yellow, the second color light is blue; and when the first color light is blue, the second color light is yellow. White light is obtained by mixing yellow and blue light.
In the embodiment of the present disclosure, by matching the carrier providing layer located between the positive electrode and the negative electrode and the 2 color light emitting layers, holes and electrons moving under the voltage of the positive electrode and the negative electrode can be converged at the color light emitting layers, so as to emit light of a preset color. By arranging the 2 light emitting layers, white light can be obtained by mixing light of 2 colors, and a foundation is provided for subsequent color display.
It should be noted that, in the embodiment of the present disclosure, in order to increase the efficiency and the lifetime of the WOLED lamp, the WOLED lamp may further include: an electron injection layer, an electron transport layer, a hole injection layer and a hole transport layer. The electron injection layer is located between the cathode and the electron transport layer, and the electron transport layer is located between the electron injection layer and the first/second color light emitting layers. The hole injection layer is located between the positive electrode and the hole transport layer, and the hole transport layer is located between the hole injection layer and the first/second color light emitting layers. In this way, the electrons in the negative electrode and the holes in the positive electrode move to the first/second color light emitting layer under the driving of the driving voltage, and in the moving process, the electrons move to the electron transport layer and the hole transport layer of the device through the electron injection layer and the hole injection layer, so that the electrons are transported to the first/second color light emitting layer through the electron transport layer, and the holes are transported to the first/second color light emitting layer through the hole transport layer.
In some embodiments, to increase the concentration of electrons and holes at the first color or second color light emitting layer, the WOLED lamp may further include: an electron blocking layer and a hole blocking layer. The electron blocking layer is positioned between the hole transport layer and the second color light-emitting layer and used for blocking electrons from the negative electrode at the interface of the second color light-emitting layer and increasing the concentration of the electrons at the interface of the second color light-emitting layer. The hole blocking layer is positioned between the electron transport layer and the first color light emitting layer and used for blocking holes from the anode at the interface of the first color light emitting layer and increasing the concentration of the holes at the interface of the first color light emitting layer.
Fig. 4 is a schematic structural diagram of a WOLED lamp according to an exemplary embodiment, and as shown in fig. 4, the WOLED lamp 400 includes:
a positive electrode 401, a negative electrode 402, an electron injection layer 406, an electron transport layer 407, a hole blocking layer 411, a first color light emitting layer 404, a hole transport layer 408, a P-type carrier supply layer 4031, an N-type carrier supply layer 4032, an electron transport layer 409, a second color light emitting layer 405, an electron blocking layer 412, a hole transport layer 410, and a hole injection layer 412.
Under the voltage of the positive electrode and the negative electrode, holes in the positive electrode and electrons in the N-type carrier providing layer move, and are merged at the second color light emitting layer, so that the electrons and the holes are combined with excitons, and light of a second color is emitted through transition of the excitons. Electrons in the negative electrode and holes in the P-type carrier supply layer move to join at the first color light emitting layer, and the electrons and holes combine with excitons and emit light of the first color by transition of the excitons.
In some embodiments, the first color light emitting layer, the carrier providing layer, and the second color light emitting layer in the WOLED lamp are located between the cathode and the anode, and are stacked in this order from top to bottom or from bottom to top; the white light is obtained by mixing the light of the second color emitted by the second color light-emitting layer and the light of the first color after passing through the first color light-emitting layer; or the light of the first color emitted by the first color light emitting layer is mixed with the light of the second color after passing through the second color light emitting layer to obtain the white light.
Here, since the functional layers are stacked, the light of the second color passes through the light emitting layer of the first color after being emitted, and the light of the first color is mixed with the light of the second color, so that white light is obtained.
It should be noted that fig. 4 is only an exemplary description, and in practical applications, if the positions of the positive electrode and the negative electrode are changed, the positions of the electron injection layer, the electron transport layer, the hole blocking layer, the electron blocking layer, the hole transport layer, and the hole injection layer in fig. 4 are also changed accordingly, and the positions may be specifically changed according to the functions.
In some embodiments, the liquid crystal display panel includes:
the color filter is positioned above the backlight module and used for filtering the white light emitted by the backlight module into red, green, blue, RGB (red, green, blue) monochromatic light required by sub-pixels contained in each pixel; wherein the area of the color filter sheet is larger than the areas of the first color light-emitting layer and the second color light-emitting layer.
Here, the color filter sheet includes: red color filters, green color filters, and blue color filters. Because the white light is mixed light, the white light can obtain RGB monochromatic light after passing through the color filter, and the three RGB monochromatic lights can be mixed to obtain different colors. Therefore, the color filter sheet is arranged above the backlight module, and can filter the white light into RGB monochromatic light after the backlight module emits the white light, so that color display is realized, the brightness of the sub-pixels corresponding to the RGB monochromatic light is controlled through the liquid crystal deflection degree, and the display of various colors of the liquid crystal display is realized through further light mixing of the RGB monochromatic light with different brightness.
In order to effectively utilize white light emitted by the backlight module and reduce the light leakage phenomenon of the display, the area of the color filter sheet can be larger than the areas of the first color light emitting layer and the second color light emitting layer, so that the light emitted by the first color light emitting layer and the light emitted by the second color light emitting layer can reach the color filter sheet and are filtered by the color filter sheet.
Fig. 5 is a schematic structural diagram of a display screen according to an exemplary embodiment, and as shown in fig. 5, the liquid crystal display panel 502 includes: and the color filter 5021 is positioned above the backlight module 501. The backlight module 501 includes a cathode, a first color light emitting layer, a second color light emitting layer, a carrier providing layer, and an anode. As shown in fig. 5, the color filter may be provided to have an area larger than that of the first color light emitting layer and the second color light emitting layer.
So, through set up the color filter plate in liquid crystal display panel, and set up the color filter plate in backlight unit's top can filter the white light that the light that sends via first color luminescent layer and second color luminescent layer in backlight unit obtains for the required red green blue RGB monochromatic light of sub-pixel that each pixel contains based on the filtering capability of color filter plate, and then realize the color display of display screen on the basis of RGB monochromatic light. The display screen with color display has wider application prospect because the display screen is more in line with the public needs.
In order to achieve a good light emitting effect of the display screen, further reduce the curvature limit and the manufacturing cost of the backlight, and reduce the thickness of the display screen, an embodiment of the present disclosure provides a method for manufacturing a display screen, and fig. 6 is a method for manufacturing a display screen according to an exemplary embodiment, as shown in fig. 6, the method includes:
101, assembling at least one organic light emitting diode WOLED lamp emitting white light to form a backlight module;
Here, the WOLED lamp refers to an organic light-Emitting Diode (OLED) Emitting White light (White). White light emitted by the WOLED lamp can be displayed by the liquid crystal display panel.
The liquid crystal display panel is transparent and can not emit light, and the backlight module is arranged below the liquid crystal display panel to realize display.
In some embodiments, the WOLED is composed of a substrate, a cathode, an anode, and a light emitting layer, wherein the substrate is used for carrying all functional layers (such as the light emitting layer), and can be made of glass or plastic. Here, when plastic is used as a material of the substrate, a bendable flexible WOLED device can be manufactured due to the softness of the plastic.
Therefore, the display screen can be assembled by assembling at least one organic light-emitting diode WOLED lamp emitting white light to form a backlight module and then placing a liquid crystal display panel above the backlight module. In the mode of manufacturing the display screen by using the WOLED as the backlight source, the advantage that the WOLED can realize larger bending radius can be utilized to reduce the curvature limit of the display screen. Moreover, the manufacturing cost and the production cost of the WOLED lamp are relatively low, and the manufacturing cost of the display screen is also saved.
In some embodiments, the method further comprises:
and the backlight module and the liquid crystal display panel are adhered through an optical transparent adhesive tape.
It should be noted that the optically transparent adhesive is an adhesive for adhering the optically transparent member. Its refractive index is similar to that of optical transparent element, and its light transmittance is good and possesses a certain toughness.
Due to the characteristics of the organic film used by the WOLED lamp, the backlight module and the liquid crystal display panel can be attached and fixed by using the optical transparent adhesive as a medium, and the WOLED lamp is simple and convenient to implement. And the display screen can be manufactured only by coating the optical transparent adhesive on the WOLED lamp and then placing the liquid crystal display panel, and the problem of fixing the membrane material is not required to be considered, so that the manufacturing process is simplified, and the requirements of production and application can be met more.
In order to reduce the curvature limitation and the manufacturing cost of the backlight source and also reduce the thickness on the basis of a good light emitting effect of the display screen, an embodiment of the present disclosure further provides a display method, fig. 7 is a schematic flow chart of a display method according to an exemplary embodiment, where the method may be applied to the display screen in any of the above embodiments, as shown in fig. 7, and the method includes:
601, emitting white light through at least one organic light emitting diode WOLED lamp in a backlight module of the display screen;
The disclosed embodiments emit white light through at least one White Organic Light Emitting Diode (WOLED) lamp as a backlight module of a display screen, so that a liquid crystal display panel positioned above the WOLED lamp can realize display based on the white light emitted by the backlight module. Therefore, by using the WOLED as the backlight source of the display screen, the advantage that the WOLED can realize a larger bending radius can be utilized to reduce the curvature limitation of the display screen. Moreover, the manufacturing cost and the production cost of the WOLED lamp are relatively low, and the manufacturing cost of the display screen is also saved.
In some embodiments, the method further comprises:
the first color light emitting layer of the WOLED lamp emits a first color light based on excitons formed by the combination of electrons and holes, and upon the decay occurring during the exciton transition;
the second color light emitting layer of the WOLED lamp emits a second color light based on excitons formed by the combination of electrons and holes, and upon the decay occurring during the exciton transition.
Wherein the light of the first color and the light of the second color are mixed to form white light.
In some embodiments, the emitting white light by at least one organic light emitting diode WOLED lamp in a backlight module of the display screen includes:
the light of the second color emitted by the second color light-emitting layer is mixed with the light of the first color to obtain the white light after passing through the first color light-emitting layer; or the light of the first color emitted by the first color light emitting layer is mixed with the light of the second color after passing through the second color light emitting layer to obtain the white light.
In some embodiments, the method further comprises:
and filtering the white light emitted by the backlight module into red, green, blue, RGB (red, green, blue) monochromatic light required by sub-pixels contained in each pixel through a color filter sheet in a liquid crystal display panel of the display screen.
So, through set up the color filter plate in liquid crystal display panel, and set up the color filter plate in backlight unit's top can filter the white light that the light that sends via first color luminescent layer and second color luminescent layer in backlight unit obtains for the required red green blue RGB monochromatic light of sub-pixel that each pixel contains based on the filtering capability of color filter plate, and then realize the color display of display screen on the basis of RGB monochromatic light. The display screen with color display has wider application prospect because the display screen is more in line with the public needs.
With regard to the method in the above-described embodiment, the details thereof have been described in detail in the embodiment relating to the apparatus and will not be explained in detail here.
FIG. 8 is a block diagram illustrating a display device or display screen preparation apparatus 1800, according to an exemplary embodiment. For example, the apparatus 1800 may be a mobile phone, computer, digital broadcast terminal, messaging device, game console, tablet device, medical device, fitness device, personal digital assistant, and so forth.
Referring to fig. 8, apparatus 1800 may include one or more of the following components: a processing component 1802, a memory 1804, a power component 1806, a multimedia component 1808, an audio component 1810, an input/output (I/O) interface 1812, a sensor component 1814, and a communications component 1816.
The processing component 1802 generally controls the overall operation of the device 1800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 1802 may include one or more processors 1820 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 1802 may also include one or more modules that facilitate interaction between the processing component 1802 and other components. For example, the processing component 1802 can include a multimedia module to facilitate interaction between the multimedia component 1808 and the processing component 1802.
The memory 1804 is configured to store various types of data to support operation at the apparatus 1800. Examples of such data include instructions for any application or method operating on the device 1800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 1804 may be implemented by any type or combination of volatile or non-volatile storage devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The multimedia component 1808 includes a screen that provides an output interface between the device 1800 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 1808 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 1800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and/or rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
I/O interface 1812 provides an interface between processing component 1802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor component 1814 includes one or more sensors for providing various aspects of state assessment for the apparatus 1800. For example, the sensor assembly 1814 can detect an open/closed state of the device 1800, the relative positioning of components such as a display and keypad of the device 1800, the sensor assembly 1814 can also detect a change in position of the device 1800 or a component of the device 1800, the presence or absence of user contact with the device 1800, orientation or acceleration/deceleration of the device 1800, and a change in temperature of the device 1800. The sensor assembly 1814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 1814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 1814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 1816 is configured to facilitate communications between the apparatus 1800 and other devices in a wired or wireless manner. The device 1800 may access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 1816 receives a broadcast signal or broadcast associated information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, or other technologies.
In an exemplary embodiment, the apparatus 1800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as the memory 1804 including instructions that are executable by the processor 1820 of the apparatus 1800 to perform the above-described method. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
A non-transitory computer-readable storage medium, wherein instructions, when executed by a processor of a device for preparing a display screen, enable the device for preparing a display screen to perform the method for preparing a display screen; and/or, when the instructions in the storage medium are executed by a processor of a display apparatus, enable the display apparatus to perform the above-described display method.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (15)
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