CN115377081A - Display device, driving method thereof and manufacturing method thereof - Google Patents
Display device, driving method thereof and manufacturing method thereof Download PDFInfo
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
- H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
-
- 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
- G02F1/15—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 an electrochromic effect
- G02F1/153—Constructional details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
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Abstract
The invention discloses a display device, a driving method and a manufacturing method thereof, wherein the display device comprises: the substrate comprises a substrate base plate, a micro light-emitting diode and an electrochromic layer; the micro light-emitting diode and the electrochromic layer are electrically connected with a circuit layer in the display device, and the circuit layer can provide driving signals for the micro light-emitting diode and the electrochromic layer; when the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, the display effect of the display device is improved, and when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device, a driving method and a manufacturing method thereof.
Background
A Mini Light Emitting Diode (Mini LED) refers to a miniaturized Light Emitting Diode chip, and has the advantages of small size, long service life, fast response speed, light and thin structure, and the like, so that it has become a current hot spot to use the Mini LED as a pixel for image display directly. In the prior art, in order to improve the display effect of the display device, a method of pasting a light shielding layer on a panel or coating a black glue layer is often adopted to improve the contrast of the display device, but with the continuous improvement of resolution, the distance between Mini LEDs is smaller and smaller, and the method of pasting the light shielding layer on the panel is not applicable any more; the black glue layer coated on the panel can also influence the emergence of the Mini LED light, and further influence the display effect of the display device.
Disclosure of Invention
In some embodiments of the present invention, a display device includes: the substrate comprises a substrate base plate, a micro light-emitting diode and an electrochromic layer; the micro light-emitting diode and the electrochromic layer are electrically connected with a circuit layer in the display device, and the circuit layer can provide driving signals for the micro light-emitting diode and the electrochromic layer; when the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, the display effect of the display device is improved, and when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
In some embodiments of the present invention, the electrochromic layer comprises: a transparent substrate; a first conductive layer on one side of the transparent substrate; the color changing layer is positioned on one side, away from the transparent substrate, of the first conducting layer; the electrolyte layer is positioned on one side, away from the first conductive layer, of the color changing layer; the ion storage layer is positioned on one side, away from the color changing layer, of the electrolyte layer; and a second conductive layer on a side of the ion storage layer facing away from the electrolyte layer.
In some embodiments of the present invention, the display device further comprises: a circuit layer; the substrate base plate is positioned at the bottom of the display device, the circuit layer is positioned on the substrate base plate, the miniature light-emitting diode is positioned on the circuit layer, the electrochromic layer is positioned on one side, close to the miniature light-emitting diode, of the circuit layer, the second conducting layer in the electrochromic layer is arranged close to the circuit layer, the electrochromic layer is electrically connected with the circuit layer, and the electrochromic layer comprises a plurality of openings used for exposing the miniature light-emitting diode; when the display device displays images, the electrochromic layer is in a black opaque state, the contrast of the display device can be effectively improved, the display effect of the display device is improved, and when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
In some embodiments of the present invention, the display device further comprises: a circuit layer; the substrate base plate is positioned at the bottom of the display device, firstly, the electrochromic layer is arranged on the substrate base plate, then, the circuit layer is arranged on the electrochromic layer, the second conducting layer in the electrochromic layer is arranged at one side close to the substrate base plate, and finally, the micro light-emitting diode is connected on the circuit layer; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
In some embodiments of the invention, the electrochromic layer is manufactured in a whole layer and is of an integrated structure, and when the display device displays images, a black opaque state can be presented only by loading a driving signal on the electrochromic layer, so that the display contrast is improved; when the display device does not display images, the electrochromic layer can be in a colorless transparent state without loading driving signals on the electrochromic layer.
In some embodiments of the present invention, when the display device is a flexible display device, the electrolyte layer is made of gel; the transparent substrate and the substrate base plate are made of one of polyethylene terephthalate or polyimide.
In some embodiments of the present invention, when the display device is a rigid display device, the electrolyte layer is made of a solid material; the transparent substrate and the substrate base plate are made of glass.
In some embodiments of the present invention, the first conductive layer and the second conductive layer are made of one of indium tin oxide, indium zinc oxide, transparent conductive oxide, fluorine-doped tin dioxide or carbon nanotubes; or, one or more of silver, copper and aluminum; the thickness of the first conductive layer and the second conductive layer ranges from 0.1 to 10 μm; the color-changing layer is made of one of transition metal oxide, polymer polypyrrole, polythiophene, polyaniline, prussian blue and derivatives thereof; the thickness of the color-changing layer is in the range of 0.05-10 μm.
In some embodiments of the present invention, a driving method of a display device includes: when the display device displays images, the electrochromic layer is controlled to be switched to a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is controlled to be switched to the colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
In some embodiments of the present invention, a driving method of a display device specifically includes: when the display device displays images, voltage is applied to the first conducting layer and the second conducting layer in the electrochromic layer, so that the electrochromic layer is in a black opaque state; when the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
In some embodiments of the present invention, a method for manufacturing a display device includes: firstly, providing a substrate, and forming a circuit layer on the substrate, wherein the circuit layer comprises a plurality of bonding pads; welding the micro light-emitting diode on the circuit layer; and then sequentially forming a second conducting layer, an ion storage layer, an electrolyte layer, a color-changing layer, a first conducting layer and a transparent substrate on one side of the circuit layer close to the micro light-emitting diode to finally form the electrochromic layer. The first conducting layer and the second conducting layer are electrically connected with the driving signal line of the circuit layer, so that the display state of the electrochromic layer is controlled, and when the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
In some embodiments of the present invention, a method for manufacturing a display device includes: firstly, providing a substrate, and sequentially forming a second conducting layer, an ion storage layer, an electrolyte layer, a color-changing layer, a first conducting layer and a transparent substrate on the substrate to finally form an electrochromic layer; forming a circuit layer on the transparent substrate, wherein the circuit layer comprises a plurality of bonding pads; and finally, welding the micro light-emitting diode to a bonding pad corresponding to the circuit layer, and packaging the micro light-emitting diode, or directly welding the packaged micro light-emitting diode to the bonding pad. The first conducting layer and the second conducting layer are electrically connected with the driving signal line of the circuit layer, so that the display state of the electrochromic layer is controlled, and when the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
In some embodiments of the present invention, the first conductive layer and the second conductive layer in the electrochromic layer may be electrically connected to the driving signal line in the line layer through a via hole, or a lead may be disposed at a side of the first conductive layer and the second conductive layer, and the lead is electrically connected to the driving signal line in the line layer, thereby controlling a color development state of the electrochromic layer.
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 cross-sectional view of a display device according to an embodiment of the invention;
fig. 2 is a schematic partial cross-sectional view of a display device according to an embodiment of the invention;
fig. 3 is a schematic cross-sectional structural diagram of an electrochromic 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 second schematic cross-sectional view illustrating a display device according to an embodiment of the invention;
fig. 6 is a third schematic partial cross-sectional view illustrating a display device according to an embodiment of the invention;
fig. 7 is a flowchart illustrating a driving method of a display device according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a method for manufacturing a display device according to an embodiment of the invention;
fig. 9a and 9b are schematic cross-sectional views corresponding to steps of a method for manufacturing a display device according to an embodiment of the invention;
fig. 10 is a second schematic flowchart illustrating a manufacturing method of a display device according to an embodiment of the invention;
fig. 11a and fig. 11b are second schematic cross-sectional views corresponding to steps of a method for manufacturing a display device according to an embodiment of the invention.
The solar cell comprises a substrate 11, a substrate 12, a circuit layer 13, a micro light emitting diode 14, an electrochromic layer 141, a transparent substrate 142, a first conducting layer 143, a color changing layer 144, an electrolyte layer 145, an ion storage layer 146 and a second conducting layer.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described in conjunction with 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.
A Mini Light Emitting Diode (Mini LED) refers to a miniaturized Light Emitting Diode chip, and has the advantages of small size, long service life, fast response speed, and thin and Light structure, so that it has become a hot spot in the past to directly use the Mini LED as a pixel for image display.
In the prior art, in order to improve the display effect of the display device, a method of pasting a light shielding layer on a panel or coating a black glue layer is often adopted to improve the contrast of the display device, but with the continuous improvement of resolution, the distance between Mini LEDs is smaller and smaller, and the method of pasting the light shielding layer on the panel is not applicable any more; the black glue layer coated on the panel can also influence the emergence of the Mini LED light, and further influence the display effect of the display device.
In view of this, as shown in fig. 1, a display device according to an embodiment of the present invention includes: a substrate 11, a wiring layer 12, a micro light emitting diode 13 and an electrochromic layer 14. Wherein, the micro light emitting diode 13 and the electrochromic layer 14 are electrically connected to the wiring layer 12, and the wiring layer can provide driving signals for the micro light emitting diode 13 and the electrochromic layer 14.
When the display device displays images, the electrochromic layer 14 is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display an image, the electrochromic layer 14 is in a colorless transparent state, so that power consumption of the display device can be effectively saved, thereby reducing use cost.
The electrochromic layer 14 adopts a stacked film structure, so that the electrochromic layer can be manufactured by processes such as sputtering, vapor deposition, sol-gel, coating, screen printing, roll-to-roll and the like, the electrochromic layer 14 has the advantages of high response speed, low power consumption, low cost, thin thickness, long service life and the like, light emission of the micro light-emitting diode 13 is not influenced, and the purpose of reducing the distance between the micro light-emitting diodes 13 can be realized.
Referring to fig. 1, a substrate 11 is disposed at the bottom of a display device, a circuit layer 12 is disposed on the substrate 11, a micro light emitting diode 13 is disposed on the circuit layer 12, and an electrochromic layer 14 is disposed on a side of the circuit layer 12 close to the micro light emitting diode 13.
Specifically, the substrate base plate 11 is located at the bottom of the display device, and has supporting and bearing functions. The substrate base plate 11 is typically a rectangular structure, and when applied to a shaped display device, its shape is adapted to the shape of the display device.
The substrate 11 supports the wiring layer 12, the electrochromic layer 14, and the like.
In the embodiment of the invention, when the display device is a rigid display device, the substrate 11 can be made of glass with high thermal conductivity, and the substrate 11 is made of glass with high thermal conductivity, so that heat generated by the display device during display can be quickly dissipated, the problem of reducing luminous efficiency caused by overhigh temperature is avoided, and in addition, the surface of the glass substrate is smooth and flat, thereby being beneficial to later-stage processing and manufacturing; the material used for the base substrate 11 may be FR4, and is not limited herein. When the display device is a flexible display device, the substrate 11 may be made of a flexible material such as polyethylene terephthalate (PET) or Polyimide (PI), which is not limited herein.
The circuit layer 12 is formed by electroplating and depositing a conductive material on the substrate 11, and etching the circuit as required, wherein the conductive material may be copper, and is not limited herein. In the manufacturing process, a plurality of bonding pads are formed on the surface of the circuit layer 12, and the bonding pads are used for welding each micro light-emitting diode 13 and providing driving signals for the micro light-emitting diodes 13; also, the line layer 12 may also provide a driving signal to the electrochromic layer 14, and specifically, the first conductive layer 142 and the second conductive layer 146 in the electrochromic layer 14 may be electrically connected to the driving signal line in the line layer 12 through a via hole, or a lead line may be provided at a side of the first conductive layer 142 and the second conductive layer 146, the lead line being electrically connected to the driving signal line in the line layer 12.
When the Circuit layer 12 is formed by the etching process, the substrate 11 and the Circuit layer 12 may form a Circuit Board, which may be a Printed Circuit Board (PCB); alternatively, when the circuit layer 12 is formed by a thin film process, the substrate 11 and the circuit layer 12 may also form an array substrate, which is not limited herein.
The micro light emitting diode 13 is located on the circuit layer 12, after the circuit layer 12 is manufactured, a pad for welding the micro light emitting diode 13 is formed on the surface of the circuit layer 12, and the micro light emitting diode 13 is welded on the pad, so that the micro light emitting diode 13 is driven to emit light by controlling a driving signal of the circuit layer 12.
The micro light emitting diode 13 is different from a general light emitting diode, and is specifically referred to as a micro light emitting diode chip. Since the micro light emitting diode 13 is small in size, when the micro light emitting diode 13 is directly used for image display as a pixel, the resolution of the display device can be greatly improved. In embodiments of the present invention, the micro light emitting diodes 13 may have various sizes, for example, the size of the micro light emitting diodes 13 is less than 500 μm. The micro light emitting diode 13 may be manufactured in a corresponding size according to practical applications, and is not limited herein.
The micro light emitting diode 13 can be packaged in two modes of a POB (point of care) mode and a COB (chip on board), when the micro light emitting diode 13 is packaged in the POB packaging mode, a packaging support is arranged on the outer side of the micro light emitting diode 13 and used for packaging and protecting the micro light emitting diode 13, and foreign matters are prevented from entering the micro light emitting diode 13. In the embodiment of the present invention, when the micro light emitting diode 13 is packaged in the POB packaging manner, the lower surface of the micro light emitting diode 13 forms a patch electrode at the same time, the patch electrode is electrically connected to the electrode of the micro light emitting diode 13 correspondingly, and the packaged micro light emitting diode 13 is applied to the corresponding position of the circuit layer 12 after packaging. The POB packaging mode has mature process and good adaptability.
In some embodiments of the present invention, the micro light emitting diode 13 is packaged by a COB packaging method, the micro light emitting diode 13 is first welded to the corresponding pad of the circuit layer 12, and then the micro light emitting diode 13 is packaged by a dispensing method on the surface of the micro light emitting diode 13, where the packaging adhesive on the surface of the micro light emitting diode 13 may be a transparent colloid material, such as silica gel, modified silica gel, or epoxy resin with a better permeability. COB packaging has higher efficiency and lower cost.
The display device provided by the embodiment of the present invention may include the micro light emitting diode 13 of one color, and may also include the micro light emitting diodes 13 of multiple colors, which is not limited herein.
The electrochromic layer 14 is located on one side of the wiring layer 12 close to the micro light emitting diodes 13, the shape and size of the electrochromic layer 14 are consistent with those of the substrate 11, and the electrochromic layer 14 comprises a plurality of openings for exposing the micro light emitting diodes 13. When the display device displays images, the electrochromic layer 14 is in a black opaque state, which can effectively improve the contrast of the display device, thereby improving the display effect of the display device; when the display device does not display images, the electrochromic layer 14 is in a colorless transparent state, so that power consumption of the display device can be effectively saved, and the use cost is reduced.
Fig. 2 is a schematic partial cross-sectional view of a display device according to an embodiment of the invention. Fig. 3 is a schematic cross-sectional structure diagram of an electrochromic layer according to an embodiment of the present invention.
Referring to fig. 2 and 3, the electrochromic layer 14 includes: a transparent substrate 141; a first conductive layer 142 on one side of the transparent substrate 141; a color changing layer 143 on a side of the first conductive layer 142 facing away from the transparent substrate 141; an electrolyte layer 144 on a side of the coloration layer 143 facing away from the first conductive layer 142; an ion storage layer 145 on a side of the electrolyte layer 144 facing away from the coloration layer 143; and a second conductive layer 146 on a side of ion storage layer 145 facing away from electrolyte layer 144; the second conductive layer 146 is disposed near the circuit layer 12.
The first conductive layer 142 and the second conductive layer 146 provided by the embodiment of the present invention are made of Indium Tin Oxide (ITO), indium Zinc Oxide (IZO), transparent Conductive Oxide (TCO), fluorine-doped tin dioxide (FTO), carbon Nanotube (CNT), or an alloy of one or more of silver, copper, and aluminum; the thickness of the first and second conductive layers 142 and 146 is in the range of 0.1 to 10 μm.
When the display device provided by the embodiment of the present invention is a flexible display device, the transparent substrate 141 is made of polyethylene terephthalate (PET) or Polyimide (PI), and the electrolyte layer 144 is made of gel, such as gelatin; when the display device provided by the embodiment of the present invention is a rigid display device, the transparent substrate 141 is made of glass, and the electrolyte layer 144 is made of a solid material, such as a salt containing lithium ions; wherein the thickness of the transparent substrate is in the range of 0.5-20 μm, and the thickness of the electrolyte layer is in the range of 0.1-10 μm.
The color-changing layer 143 is made of one of transition metal oxide, polymer polypyrrole, polythiophene, polyaniline, prussian blue and derivatives thereof; the thickness of the color-changing layer 143 is in the range of 0.05-10 μ m。
The ion storage layer 145 includes ions participating in an electrochromic reaction, and the thickness of the ion storage layer 145 ranges from 0.05 to 10 μm.
Specifically, the first conductive layer 142 and the second conductive layer 146 provided by the embodiment of the present invention may be electrically connected to the driving signal line in the line layer 12 through a via, or a lead may be provided at a side of the first conductive layer 142 and the second conductive layer 146, and the lead is electrically connected to the driving signal line in the line layer 12. When the discoloration layer 143 is made of a transition metal oxide, the first conductive layer 142 and the second conductive layer 146 form an electric field after an electrical signal is applied, so that ions in the ion storage layer 145 can reach the discoloration layer 143 through the electrolyte layer 144, and the discoloration layer 143 undergoes an oxidation-reduction reaction, resulting in a change in the state of metal ions of a main valence bond; or, when the color-changing layer 143 is a polymer layer, by applying an electrical signal to the first conductive layer 142 and the second conductive layer 146, the color-changing layer 143 undergoes doping and dedoping reactions, which results in a change in the state of covalent bonds in the polymer, and thus results in a change in the absorption and reflection of light by the color-changing layer 143, and further results in a change in the color of the color-changing layer 143 viewed by human eyes, and finally the electrochromic layer 14 is switched between a colorless transparent state and a black opaque state according to display requirements.
In the embodiment of the present invention, the applied voltage to the electrochromic layer 14 is about 1.5V, and the power consumption is small.
In some embodiments, as shown in fig. 2, the packaged micro leds 13 may be soldered on the circuit layer 12, and then the electrochromic layer 14 is formed in the area where the micro leds 13 are not disposed. Or, the micro light emitting diode 13 is firstly soldered on the circuit layer 12, the micro light emitting diode 13 is then packaged by dispensing, and the electrochromic layer 14 is then fabricated in the region where the micro light emitting diode 13 is not disposed. The electrochromic layer 14 is fabricated by sequentially fabricating a second conductive layer 146, an ion storage layer 145, an electrolyte layer 144, a color-changing layer 143, a first conductive layer 142, and a transparent substrate 141 on the surface of the wiring layer 12.
When the flexible display device is applied to a flexible display device, the second conductive layer 146 and the ion storage layer 145 can be manufactured on the surface of the circuit layer 12; a first conductive layer 142 and a discoloration layer 143 are formed on the surface of a transparent substrate 141, and a substrate on which a second conductive layer 146 and an ion storage layer 145 are formed is bonded to the substrate on which the first conductive layer 142 and the discoloration layer 143 are formed using an electrolyte layer 144.
In other embodiments, as shown in fig. 4, the micro light emitting diodes 143 may be soldered on the surface of the circuit layer 12, the electrochromic layer 14 may be formed in the area of the circuit layer 12 where the micro light emitting diodes 13 are not disposed, and finally the micro light emitting diodes 143 and the electrochromic layer 14 are packaged together. At this time, the electrochromic layer 14 is manufactured by sequentially manufacturing the second conductive layer 146, the ion storage layer 145, the electrolyte layer 144, the color-changing layer 143, and the first conductive layer 142 on the surface of the circuit layer 12, and finally coating the encapsulation adhesive on the surfaces of the micro light emitting diode 13 and the first conductive layer 142, so that the encapsulation adhesive not only can perform the insulation protection function on the first conductive layer 142, but also can perform the encapsulation protection function on the micro light emitting diode 13, and at this time, the encapsulation adhesive can be used as the transparent substrate 141, which simplifies the manufacturing process and reduces the manufacturing cost.
Fig. 5 is a second schematic cross-sectional view of a display device according to an embodiment of the invention. Fig. 6 is a third schematic partial sectional view of a display device according to an embodiment of the invention.
In other embodiments, referring to fig. 5 and 6, the substrate 11 provided by the embodiments of the present invention is located at the bottom of the display device, and the electrochromic layer 14 is first disposed on the substrate 11, the circuit layer 12 is then disposed on the electrochromic layer 14, and finally the micro light emitting diodes 13 are connected to the circuit layer 12.
Specifically, the substrate base plate 11 is located at the bottom of the display device, and has supporting and bearing functions.
The electrochromic layer 14 is located on the base substrate 11, and the shape and size of the electrochromic layer 14 are the same as those of the base substrate 11, and at this time, the second conductive layer 146 in the electrochromic layer 14 is disposed close to the base substrate 11 side.
The circuit layer 12 is formed by electroplating and depositing a conductive material on the transparent substrate 141, and etching the circuit as required, wherein the conductive material may be copper, and is not limited herein. In the manufacturing process, a plurality of bonding pads are formed on the surface of the circuit layer 12, and the bonding pads are used for welding each micro light-emitting diode 13 and providing driving signals for the micro light-emitting diodes 13; moreover, the circuit layer 12 may also provide a driving signal for the electrochromic layer 14, specifically, the first conductive layer 142 and the second conductive layer 146 in the electrochromic layer 14 may be electrically connected to a driving signal in the circuit layer 12 through a via, or a lead is disposed at a side of the first conductive layer 142 and the second conductive layer 146, the lead is electrically connected to the driving signal in the circuit layer 12, and the circuit layer 12 provides the driving signal for the electrochromic layer 14, so as to control the display state of the electrochromic layer 14, when the display device performs image display, the electrochromic layer 14 is in a black opaque state, which may effectively improve the contrast of the display device, thereby improving the display effect of the display device; when the display device does not display an image, the electrochromic layer 14 is in a colorless transparent state, which can effectively save the power consumption of the display device, thereby reducing the use cost.
When the Circuit layer 12 is formed by the etching process, the transparent substrate 141 and the Circuit layer 12 may form a Circuit Board, which may be a Printed Circuit Board (PCB); alternatively, when the circuit layer 12 is formed by a thin film process, the transparent substrate 141 and the circuit layer 12 may also form an array substrate, which is not limited herein.
The micro light emitting diode 13 is located on the circuit layer 12, after the circuit layer 12 is manufactured, a bonding pad for bonding the micro light emitting diode 13 is formed on the surface of the circuit layer 12, and the micro light emitting diode 13 is bonded on the bonding pad, so that the micro light emitting diode 13 is driven to emit light by controlling a driving signal of the circuit layer 12.
In the embodiment of the present invention, no matter which structure of fig. 1 and fig. 4 is adopted by the display device, the electrochromic layer 14 is manufactured in a whole layer and is an integral structure, and when the display device displays an image, the display device can present a black opaque state only by loading a driving signal to the electrochromic layer, so as to improve the display contrast; when the display device does not display images, the electrochromic layer can be in a colorless transparent state without loading driving signals on the electrochromic layer. This can simplify the driving of the electrochromic layer 14, and realize high-contrast image display.
In another aspect of the embodiments of the present invention, a driving method based on the display device is provided. Fig. 7 is a flowchart illustrating a driving method of a display device according to an embodiment of the present invention.
Referring to fig. 7, a method for driving a display device according to an embodiment of the present invention includes:
s10, determining whether the display device starts to display the image;
s20, when the display device displays images, controlling the electrochromic layer to be switched to a black opaque state;
and S30, controlling the electrochromic layer to be switched into a colorless and transparent state when the display device does not display the image.
The electrochromic layer is in a black opaque state when the display device displays an image, and is in a colorless transparent state when the display device does not display an image.
Specifically, when the display device displays an image, a first conductive layer and a second conductive layer in the electrochromic layer are subjected to voltage loading, so that the electrochromic layer is in a black opaque state; when the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
In another aspect of the embodiments of the present invention, a method for manufacturing a display device is provided. Fig. 8 is a flowchart illustrating a method for manufacturing a display device according to an embodiment of the invention.
Referring to fig. 8, a method for manufacturing a display device according to an embodiment of the present invention includes:
s101, providing a substrate, and forming a circuit layer on the substrate, wherein the circuit layer comprises a plurality of bonding pads;
s102, welding the micro light-emitting diode on a bonding pad;
s103, forming an electrochromic layer on one side of the circuit layer close to the micro light-emitting diode; the electrochromic layer includes an opening for exposing the micro light emitting diode, and the electrochromic layer is electrically connected to the wiring layer.
Fig. 9a and 9b are schematic cross-sectional views corresponding to steps of a method for manufacturing a display device according to an embodiment of the invention.
Specifically, referring to fig. 9a, in the manufacturing method of the display device according to the embodiment of the present invention, a substrate 11 is provided, a layer of conductive material is deposited on the substrate 11 by electroplating, a circuit is etched on the conductive material as required, and a circuit layer 12 is formed, where the circuit layer 12 includes a plurality of pads.
Referring to fig. 9b, solder paste is printed on the pads of the wiring layer 12, and the micro light emitting diodes 13 are placed on the pads on which the solder paste has been printed; reflow soldering is carried out on the substrate 11 on which the micro light-emitting diode 13 is placed, the solder paste is melted and then solidified, the micro light-emitting diode 13 is soldered on the circuit layer 12, and then the micro light-emitting diode 13 is packaged on the surface of the micro light-emitting diode 13 in a dispensing mode; or, a package support is arranged on the outer side of the micro light emitting diode 13, and the lower surface of the packaged micro light emitting diode 13 forms a patch electrode at the same time, so that the packaged micro light emitting diode 13 is attached to the corresponding pad position of the circuit layer 12.
Further, a second conductive layer 146, an ion storage layer 145, an electrolyte layer 144, a color-changing layer 143, a first conductive layer 142 and a transparent substrate 141 are sequentially formed on one side of the circuit layer 12 close to the micro light emitting diode 13, and finally, the electrochromic layer 14 shown in fig. 2 is formed, the first conductive layer 142 and the second conductive layer 146 are electrically connected with a driving signal line of the circuit layer 12, so that the display state of the electrochromic layer 14 is controlled, when the display device displays an image, the electrochromic layer 14 is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer 14 is in a colorless transparent state, so that power consumption of the display device can be effectively saved, and the use cost is reduced.
The second conductive layer 146, the ion storage layer 145, the electrolyte layer 144, the discoloring layer 143, the first conductive layer 142, and the transparent substrate 141 may be fabricated by sputtering, vapor deposition, sol-gel, coating, screen printing, roll-to-roll, and other fabrication processes. Or, when the micro light emitting diode 13 is soldered to the circuit layer 12 and the micro light emitting diode 13 is not packaged, after the second conductive layer 146, the ion storage layer 145, the electrolyte layer 144, the discoloration layer 143 and the first conductive layer 142 are sequentially formed on one side of the circuit layer 12 close to the micro light emitting diode 13, finally, a packaging adhesive is coated on the surfaces of the first conductive layer 142 and the micro light emitting diode 13 for packaging, the packaging adhesive layer can play a role in insulating and protecting the first conductive layer 142 and can also play a role in packaging and protecting the micro light emitting diode 13, and at this time, the packaging adhesive layer can be used as the transparent substrate 141 shown in fig. 4.
Fig. 10 is a second flowchart illustrating a manufacturing method of a display device according to an embodiment of the invention.
Referring to fig. 10, a method for manufacturing a display device according to another embodiment of the present invention includes:
s201, providing a substrate, and forming an electrochromic layer on the substrate;
s202, forming a circuit layer on one side of the electrochromic layer, which is far away from the substrate; the circuit layer comprises a plurality of bonding pads, and the electrochromic layer is electrically connected with the circuit layer;
and S203, welding the micro light-emitting diode on the bonding pad.
Fig. 11a and fig. 11b are second schematic cross-sectional views corresponding to steps of a manufacturing method of a display device according to an embodiment of the invention.
Specifically, referring to fig. 11a, in the method for manufacturing a display device according to the embodiment of the present invention, a substrate 11 is provided, and a second conductive layer 146, an ion storage layer 145, an electrolyte layer 144, a color-changing layer 143, a first conductive layer 142, and a transparent substrate 141 are sequentially formed on the substrate 11 by using sputtering, vapor deposition, sol-gel, coating, screen printing, roll-to-roll, or other manufacturing processes, so as to finally form an electrochromic layer 14.
Referring to fig. 11b, a layer of conductive material is deposited on the transparent substrate 141 by electroplating, and a circuit is etched on the conductive material as required to form a circuit layer 12, wherein the circuit layer 12 forms a plurality of pads and driving signal lines electrically connected to the electrochromic layer 14 during the manufacturing process; specifically, the first conductive layer 142 and the second conductive layer 146 in the electrochromic layer 14 may be electrically connected to the driving signal line in the line layer 12 through a via, or a lead is disposed on a side surface of the first conductive layer 142 and the second conductive layer 146, and the lead is electrically connected to the driving signal line in the line layer 12, so as to control the display state of the electrochromic layer 14, and when the display device displays an image, the electrochromic layer 14 is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer 14 is in a colorless transparent state, so that power consumption of the display device can be effectively saved, and the use cost is reduced.
After the circuit layer 12 is formed, the micro light-emitting diode 13 is welded on a bonding pad corresponding to the circuit layer 12, and then the micro light-emitting diode 13 is packaged on the surface of the micro light-emitting diode 13 in a dispensing mode; or, a package support is disposed outside the micro light emitting diode 13, a patch electrode is formed on the lower surface of the packaged micro light emitting diode 13 at the same time, and then the packaged micro light emitting diode 13 is attached to the corresponding pad position of the circuit layer 12, so as to finally form the display device shown in fig. 6.
According to the first inventive concept, a display apparatus includes: the LED comprises a substrate base plate, a circuit layer, a micro LED and an electrochromic layer. The micro light-emitting diode and the electrochromic layer are electrically connected with the circuit layer, and the circuit layer can provide driving signals for the micro light-emitting diode and the electrochromic layer. When the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
According to the second inventive concept, the electrochromic layer adopts a stacked film structure, so that the electrochromic layer can be manufactured by adopting the processes of sputtering, vapor deposition, sol-gel, coating, screen printing, roll-to-roll and the like, has the advantages of high response speed, low power consumption, low cost, thin thickness, long service life and the like, does not influence the light emission of the micro light-emitting diode, and can be realized even if the distance between the micro light-emitting diodes is reduced.
According to a third inventive concept, a substrate is positioned at the bottom of a display device, a circuit layer is positioned on the substrate, a micro light emitting diode is positioned on the circuit layer, an electrochromic layer is positioned on one side of the circuit layer close to the micro light emitting diode and is electrically connected with the circuit layer, and the electrochromic layer comprises an opening for exposing the micro light emitting diode; when the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
According to the fourth inventive concept, the substrate is positioned at the bottom of the display device, firstly, the electrochromic layer is arranged on the substrate, then, the circuit layer is arranged on the electrochromic layer, and finally, the micro light-emitting diode is connected on the circuit layer; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
According to the fifth inventive concept, the electrochromic layer is manufactured by sequentially manufacturing the second conductive layer, the ion storage layer, the electrolyte layer, the color changing layer and the first conductive layer on the surface of the circuit layer, and finally coating the packaging adhesive on the surfaces of the micro light-emitting diode and the first conductive layer, so that the packaging adhesive layer can play a role in insulating and protecting the first conductive layer and can also play a role in packaging and protecting the micro light-emitting diode, and at the moment, the packaging adhesive layer can be used as a transparent substrate, so that the manufacturing process is simplified, and the manufacturing cost is reduced.
According to a sixth inventive concept, a driving method of a display device includes: when the display device displays images, applying voltage to the first conducting layer and the second conducting layer in the electrochromic layer to enable the electrochromic layer to be in a black opaque state; when the display device displays images, the electrochromic layer is in a black opaque state, so that the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
According to a seventh inventive concept, a method of manufacturing a display device includes: firstly, providing a substrate, electroplating and depositing a layer of conductive material on the substrate, etching a circuit on the conductive material as required to form a circuit layer, wherein the circuit layer comprises a plurality of bonding pads; welding the micro light-emitting diode on the circuit layer, and packaging the micro light-emitting diode on the surface of the micro light-emitting diode in a dispensing manner; or a packaging support is arranged on the outer side of the micro light-emitting diode, the lower surface of the packaged micro light-emitting diode simultaneously forms a patch electrode, and the packaged micro light-emitting diode is pasted on the corresponding bonding pad position of the circuit layer; then, a second conducting layer, an ion storage layer, an electrolyte layer, a color-changing layer, a first conducting layer and a transparent substrate are sequentially formed on one side, close to the micro light-emitting diode, of the circuit layer, and finally the electrochromic layer is formed; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced.
According to the eighth inventive concept, the method of manufacturing a display device further includes: when the miniature light-emitting diode is welded on the circuit layer and is not packaged, after the second conducting layer, the ion storage layer, the electrolyte layer, the color changing layer and the first conducting layer are sequentially formed on one side, close to the miniature light-emitting diode, of the circuit layer, finally, packaging glue is coated on the surfaces of the first conducting layer and the miniature light-emitting diode for packaging, the packaging glue layer can play a role in insulating and protecting the first conducting layer and can also play a role in packaging and protecting the miniature light-emitting diode, at the moment, the packaging glue layer can serve as a transparent substrate, the manufacturing process is simplified through the arrangement, and the manufacturing cost is reduced.
According to a ninth inventive concept, a method of manufacturing a display device includes: firstly, providing a substrate, and sequentially forming a second conducting layer, an ion storage layer, an electrolyte layer, a color-changing layer, a first conducting layer and a transparent substrate on the substrate to finally form an electrochromic layer; electroplating and depositing a layer of conductive material on the transparent substrate, etching a circuit on the conductive material as required to form a circuit layer, wherein the circuit layer can form a plurality of bonding pads and a driving signal wire electrically connected with the electrochromic layer in the manufacturing process; specifically, a first conducting layer and a second conducting layer in the electrochromic layer can be electrically connected with a driving signal line in the circuit layer through a via hole, or lead wires are arranged on the side surfaces of the first conducting layer and the second conducting layer and are electrically connected with the driving signal line in the circuit layer, so that the display state of the electrochromic layer is controlled, when the display device displays images, the electrochromic layer is in a black opaque state, the contrast of the display device can be effectively improved, and the display effect of the display device is improved; when the display device does not display images, the electrochromic layer is in a colorless transparent state, so that the power consumption of the display device can be effectively saved, and the use cost is reduced; and finally, welding the micro light-emitting diode to a bonding pad corresponding to the circuit layer, and packaging the micro light-emitting diode, or directly welding the packaged micro light-emitting diode to the bonding pad, thereby finishing the manufacture of the display device.
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 the preferred embodiment and all changes and modifications that 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 (10)
1. A display device, comprising:
the substrate base plate has the functions of supporting and bearing;
the micro light-emitting diode is positioned on the substrate base plate;
the electrochromic layer is positioned on the substrate, and the electrochromic layer and the micro light-emitting diode are positioned on the same side of the substrate;
when the display device displays images, the electrochromic layer is in a black opaque state; when the display device does not display images, the electrochromic layer is in a colorless transparent state.
2. The display device of claim 1, wherein the electrochromic layer comprises:
a transparent substrate;
a first conductive layer on one side of the transparent substrate;
the color changing layer is positioned on one side, away from the transparent substrate, of the first conducting layer;
the electrolyte layer is positioned on one side, away from the first conducting layer, of the color changing layer;
the ion storage layer is positioned on one side of the electrolyte layer, which is far away from the color changing layer;
and the second conducting layer is positioned on one side of the ion storage layer, which is far away from the electrolyte layer.
3. The display device of claim 2, further comprising:
the circuit layer is positioned on the substrate and used for providing a driving signal;
the micro light-emitting diode is positioned on the circuit layer and is electrically connected with the circuit layer;
the electrochromic layer is positioned on one side of the circuit layer close to the micro light-emitting diode; the electrochromic layer includes an opening for exposing the micro light emitting diode; the electrochromic layer is electrically connected with the circuit layer;
the second conducting layer is arranged close to one side of the circuit layer.
4. The display device of claim 2, further comprising:
the circuit layer is positioned on one side of the electrochromic layer, which is far away from the substrate base plate, and is used for providing a driving signal;
the miniature light-emitting diode is positioned on one side of the circuit layer, which is far away from the electrochromic layer, and is electrically connected with the circuit layer;
the electrochromic layer is positioned between the substrate and the circuit layer and is electrically connected with the circuit layer;
the second conducting layer is arranged close to one side of the substrate base plate.
5. The display device according to claim 2, wherein the display device is a flexible display device, and the electrolyte layer is made of a gel;
the transparent substrate and the substrate base plate are made of one of polyethylene terephthalate or polyimide.
6. The display device according to claim 2, wherein the display device is a rigid display device, and a material used for the electrolyte layer is a solid;
the transparent substrate and the substrate base plate are made of glass.
7. The display device according to claim 2, wherein a material used for the first conductive layer and the second conductive layer is one of indium tin oxide, indium zinc oxide, a transparent conductive oxide, fluorine-doped tin dioxide, or a carbon nanotube; or one or more of silver, copper and aluminum; the thickness of the first conductive layer and the second conductive layer ranges from 0.1 to 10 μm;
the color-changing layer is made of one of transition metal oxide, polymer polypyrrole, polythiophene, polyaniline, prussian blue and derivatives thereof; the thickness range of the color changing layer is 0.05-10 mu m.
8. A driving method for a display device according to any one of claims 1 to 7, comprising:
when the display device displays images, the electrochromic layer is controlled to be switched to a black opaque state;
and when the display device does not display images, controlling the electrochromic layer to be switched into a colorless and transparent state.
9. The driving method as claimed in claim 8, wherein said controlling the electrochromic layer to be switched to the black opaque state when the display device performs image display comprises:
when the display device displays images, applying voltage to the first conductive layer and the second conductive layer to enable the electrochromic layer to be in a black opaque state;
controlling the electrochromic layer to be switched to a colorless transparent state when the display device does not display an image, comprising:
and when the display device does not display images, stopping applying the voltage to the first conductive layer and the second conductive layer so that the electrochromic layer is in a colorless and transparent state.
10. A method for manufacturing a display device, comprising:
providing a substrate, and forming a circuit layer on the substrate, wherein the circuit layer comprises a plurality of welding pads;
soldering a micro light emitting diode to the pad;
forming an electrochromic layer on one side of the circuit layer close to the micro light-emitting diode; the electrochromic layer comprises an opening for exposing the micro light-emitting diode, and is electrically connected with the circuit layer;
or,
providing a substrate, and forming an electrochromic layer on the substrate;
forming a circuit layer on one side of the electrochromic layer, which is far away from the substrate base plate; the circuit layer comprises a plurality of bonding pads, and the electrochromic layer is electrically connected with the circuit layer;
and welding a micro light-emitting diode on the bonding pad.
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| CN202110559443.4A CN115377081A (en) | 2021-05-21 | 2021-05-21 | Display device, driving method thereof and manufacturing method thereof |
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| CN202110559443.4A CN115377081A (en) | 2021-05-21 | 2021-05-21 | Display device, driving method thereof and manufacturing method thereof |
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