CN110850616A - Display device - Google Patents

Display device Download PDF

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Publication number
CN110850616A
CN110850616A CN201911197742.7A CN201911197742A CN110850616A CN 110850616 A CN110850616 A CN 110850616A CN 201911197742 A CN201911197742 A CN 201911197742A CN 110850616 A CN110850616 A CN 110850616A
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China
Prior art keywords
electrode
charging
panel
electrically connected
charging unit
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Pending
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CN201911197742.7A
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Chinese (zh)
Inventor
董崔健
席克瑞
周一安
秦锋
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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Priority to CN201911197742.7A priority Critical patent/CN110850616A/en
Publication of CN110850616A publication Critical patent/CN110850616A/en
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1343Electrodes
    • G02F1/134309Electrodes characterised by their geometrical arrangement
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306Circuit arrangements or driving methods for the control of single liquid crystal cells
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1334Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Geometry (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention discloses a display device, which belongs to the technical field of display and comprises a transparent display panel, a power supply module and a solar charging panel, wherein the solar charging panel is positioned on one side of the transparent display panel; the power module is electrically connected with the transparent display panel, and the solar charging panel is electrically connected with the power module; the first charging unit and the second charging unit of the solar charging panel are electrically connected in series, and the orthographic projection of the charging unit to the transparent display panel is positioned in the range of the display area; each charging unit comprises a first electrode and a second electrode which are oppositely arranged, and a PN junction is arranged between the first electrode and the second electrode. According to the invention, the solar charging panel is integrated under the transparent display panel in a film forming mode, so that the display device can generate electricity automatically, and the boosting effect is realized through the charging unit structure connected in series in the solar charging panel, thus the solar energy display panel has higher light energy utilization efficiency.

Description

Display device
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
In the modern society, portable equipment with a display brings much fun to people, but portable equipment with a display is usually small in size, so that the size of a battery is not large, the capacity of the battery is small, the portable equipment with the display cannot be supported for long-time use, people are required to frequently charge the portable equipment with the display, or people carry mobile charging equipment while carrying the portable equipment with the display, and great inconvenience is caused to the trip of people.
With the development of society, solar energy technology is increasingly utilized. Solar technology refers to technology that is capable of converting sunlight into electricity, which can then be used to drive various electronic devices. Solar energy is an inexhaustible and harmless source of energy, and there are many benefits to utilizing solar energy. For example, solar energy can be used to generate electricity without generating pollution such as air pollution, noise pollution, or greenhouse gases. Therefore, the technology of combining the display with solar energy is developed, and the solar cell absorbs the light source and converts the light source into electric energy to supply power for the display. In the prior art, most research and development personnel are dedicated to research on transparent solar power generation devices, but the transparent solar power generation devices only absorb ultraviolet rays or infrared rays, and the photoelectric conversion efficiency is low; and because the common solar power generation device is completely opaque, the common solar power generation device cannot be applied to common display equipment.
Therefore, how to better combine the solar technology with the display technology, provide a display device that can generate electricity, has the ability of absorbing solar energy and converting the solar energy into electric energy, and has a relatively ideal photoelectric conversion efficiency, and further realizes lower power consumption and a more environment-friendly structure is a technical problem that needs to be solved urgently by technical staff in the field.
Disclosure of Invention
In view of the above, the present invention provides a display device to solve the problems in the prior art that the solar technology and the display technology cannot be well combined and the photoelectric conversion efficiency is low.
The invention provides a display device, which comprises a transparent display panel, a power supply module and a solar charging panel, wherein the solar charging panel is positioned on one side of the transparent display panel; the power module is electrically connected with the transparent display panel, and the solar charging panel is electrically connected with the power module; the transparent display panel comprises a display area and a non-display area arranged around the display area, the solar charging panel comprises at least two charging units which are respectively a first charging unit and a second charging unit, the first charging unit and the second charging unit are electrically connected in series, and the orthographic projection of the charging units to the transparent display panel is positioned in the range of the display area; along the direction vertical to the light-emitting surface of the transparent display panel, each charging unit comprises a first electrode and a second electrode which are oppositely arranged, and a PN junction is arranged between the first electrode and the second electrode; the first electrode is positioned on one side of the second electrode close to the transparent display panel, the first electrode is electrically connected with one pole of the power module through a first metal wire, and the second electrode is electrically connected with the other pole of the power module through a second metal wire; the orthographic projections of the first metal lines and the second metal lines to the transparent display panel are both located in the range of the non-display area.
Compared with the prior art, the display device provided by the invention at least realizes the following beneficial effects:
the solar charging system combines the transparent display panel with the solar charging panel, integrates the solar charging panel under the transparent display panel in a film forming mode, and realizes the boosting effect through the charging unit structure connected in series in the solar charging panel. The transparent display panel can be in a display state and a non-display state, the whole transparent display panel is in the transparent state in the non-display state, and light rays can completely penetrate through the transparent display panel to be absorbed by the solar charging panel, so that light energy is converted into electric energy to charge the power supply module; and in the display state, only the display area is in a non-transparent state or a flocculent whitening state, and other non-display areas are still in a transparent state, are still used for the penetration of light rays for the solar charging panel to absorb, continue to convert the light energy into the electric energy, and continuously charge the power module. The solar energy display panel has higher light energy utilization efficiency, can effectively combine a solar energy technology with a display technology, and utilizes the solar charging panel to effectively utilize the light energy and convert the light energy into electric energy, so that the display device can generate electricity automatically. The solar charging panel is internally provided with the charging units connected in series, so that the boosting effect can be further realized, and the ideal photoelectric conversion efficiency can be realized.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view of a display device according to an embodiment of the present invention;
fig. 2 is a block diagram of an electrical connection structure of the display device of fig. 1;
FIG. 3 is a schematic sectional view taken along line A-A' of FIG. 1;
FIG. 4 is a schematic view of the structure of FIG. 1 taken along line A-A' in another cross-section;
FIG. 5 is a schematic cross-sectional view of a charging unit;
FIG. 6 is a schematic diagram of the principle structure of the charging unit;
FIG. 7 is a schematic diagram of a PN junction plus a forward voltage;
FIG. 8 is a schematic diagram of PN junction plus reverse voltage;
FIG. 9 is a schematic cross-sectional view of another charging unit;
FIG. 10 is a schematic cross-sectional view illustrating the three charging units of the present embodiment electrically connected in series;
fig. 11 is a schematic plan view of another display device according to an embodiment of the present invention;
fig. 12 is a schematic plan view of another display device provided in an embodiment of the present invention;
fig. 13 is a block diagram of an electrical connection structure of the display device of fig. 12;
fig. 14 is a schematic plan view of another display device provided in an embodiment of the present invention;
fig. 15 is a block diagram of another electrical connection structure of the display device of fig. 1.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, fig. 1 is a schematic plan structure diagram of a display device according to an embodiment of the present invention, fig. 2 is a block diagram of an electrical connection structure of the display device of fig. 1, fig. 3 is a schematic sectional structure diagram of a direction a-a ' in fig. 1, fig. 4 is a schematic sectional structure diagram of a direction a-a ' in fig. 1, and fig. 4 is a schematic sectional structure diagram of another direction a-a ' in fig. 1, in which a display device 000 according to an embodiment includes: a transparent display panel 10 (not filled in fig. 1), a power module 20 (not shown in fig. 1), and a solar charging panel 30 (not filled in fig. 1), the solar charging panel 30 being located at one side of the transparent display panel 10; specifically, the solar charging panel 30 is located at one side of the transparent display panel 10 and at one side far away from the light emitting surface E of the transparent display panel 10; alternatively, the power module 20 may be a rechargeable battery;
the power module 20 is electrically connected with the transparent display panel 10, and the solar charging panel 30 is electrically connected with the power module 20;
the transparent display panel 10 comprises a display area AA and a non-display area NA arranged around the display area AA, the solar charging panel 30 comprises at least two charging units 300 which are respectively a first charging unit 301 and a second charging unit 302, the first charging unit 301 and the second charging unit 302 are electrically connected in series, and the orthographic projection of the charging unit 300 to the transparent display panel 10 is located in the range of the display area AA;
along a direction Z perpendicular to the light emitting surface E of the transparent display panel 10, each charging unit 300 includes a first electrode 3001 and a second electrode 3002 which are oppositely disposed, and a PN junction 3003 is disposed between the first electrode 3001 and the second electrode 3002;
the first electrode 3001 is located on one side of the second electrode 3002 close to the transparent display panel 10, the first electrode 3001 is electrically connected to one pole of the power module 20 through a first metal wire 41, and the second electrode 3002 is electrically connected to the other pole of the power module 20 through a second metal wire 42;
the orthographic projections of the first metal lines 41 and the second metal lines 42 to the transparent display panel 10 are both located within the non-display area NA.
Specifically, the display device 000 of the present embodiment includes a transparent display panel 10, a power module 20, and a solar charging panel 30, wherein the solar charging panel 30 is located at one side of the transparent display panel 10 and at a side far away from the light emitting surface E of the transparent display panel 10; the power module 20 is electrically connected with the transparent display panel 10, the solar charging panel 30 is electrically connected with the power module 20, and the solar charging panel 30 can absorb light rays penetrating through the transparent display panel 10 and convert light energy into electric energy for further charging the power module 20; the power module 20 stores the electric energy integrated by the solar charging panel 30 for supplying power to the transparent display panel 10; namely, the solar charging panel 30 is used for charging the power module 20, the transparent display panel 10 is supplied with power by the power module 20, and a direct power supply relationship is not formed between the transparent display panel 10 and the solar charging panel 30, so that electric energy can be stored in time when light is sufficient, the transparent display panel 10 can be used at any time, and the flexibility is high. Optionally, the power module 20 may be disposed on the transparent display panel 10 and the solar charging panel 30, and may also be integrated with any one of the transparent display panel 10 and the solar charging panel 30, and this embodiment is not limited specifically, and only needs to satisfy that the power module 20 is electrically connected to the transparent display panel 10 and the solar charging panel 30, so as to achieve the effects of storing the electric energy integrated by the solar charging panel 30 and providing power for the transparent display panel 10.
In general, a liquid crystal display device in the related art realizes display of an image by utilizing optical anisotropy and birefringence properties of liquid crystal molecules, and generally requires a polarizing plate, an alignment layer, and the like to be provided therein. However, such a polarizing plate, an alignment layer, and the like tend to cause relatively serious optical loss, shading, and the like. For this reason, this embodiment exemplarily proposes a transparent display panel using a pdlc (polymeric dispersed Liquid crystal) layer as a Liquid crystal layer, and optionally, a pnlc (polymer Network Liquid crystal) layer may also be used as a transparent display panel of a Liquid crystal layer. A transparent display panel using a PDLC layer as a liquid crystal layer is formed by mixing small molecule liquid crystals and a prepolymer with each other, and forming liquid crystal droplets of micron order through a polymerization reaction under certain conditions and uniformly dispersing them in a polymer network. The PDLC layer realizes an electro-optical response characteristic by means of dielectric anisotropy of liquid crystal molecules. The PDLC layer mainly operates between a light scattering state and a transparent state, and is roughly classified into two types of forward PDLC and reverse PDLC. For a forward PDLC layer, it assumes a light scattering state when energized and a transparent state when de-energized. In contrast, for an inverse PDLC layer, the situation is exactly the opposite, i.e. a transparent state when powered on and a light scattering state when powered off. Since the transparent display device does not require a polarizing plate, an alignment layer, or the like, is easier to manufacture, and has a higher light utilization rate, it has received increasing attention and is widely used in various fields.
Alternatively, as shown in fig. 4, the transparent display panel 10 of the present embodiment may include a first transparent substrate 101 and a second transparent substrate 102 that are oppositely disposed, and a liquid crystal layer 103 interposed between the first transparent substrate 101 and the second transparent substrate 102, where the liquid crystal layer 103 includes polymer dispersed liquid crystal; the surface of the first transparent substrate 101 facing the liquid crystal layer 103 is provided with a first transparent conductive layer 104, the surface of the second transparent substrate 102 facing the liquid crystal layer 103 is provided with a second transparent conductive layer 105, different gray-scale pictures can be displayed without arranging a polarizer in the transparent display panel 10, the transparent display panel 10 does not include a polarizer and color resistance, and compared with the prior art, the transmittance of the transparent display panel 10 can be improved. The liquid crystal layer 103 of the transparent display panel 10 comprises polymer dispersed liquid crystal or polymer network liquid crystal, i.e. PDLC layer or PNLC layer, in which liquid crystal is dispersed in micro-droplets in an organic solid polymer matrix, the refractive index of which does not match the refractive index of the matrix since the optical axes of the micro-droplets composed of liquid crystal molecules are in free orientation. The liquid crystal in the polymer network liquid crystal is not spherical (or ellipsoidal) droplets, but is distributed in a polymer three-dimensional network to form a continuous channel network.
Optionally, any one of the first transparent conductive layer 104 and the second transparent conductive layer 105 is a plurality of conductive blocks with a block structure arranged in an array, and the other one is a layer structure, or both the first transparent conductive layer 104 and the second transparent conductive layer 105 are conductive blocks with a block structure arranged in a plurality of arrays, optionally, the first transparent substrate 101 may include a plurality of pixels (not shown) arranged in an array, each pixel includes a pixel electrode (i.e., a conductive block with a block structure), the second transparent substrate 102 includes a common electrode layer, and the common electrode layer is connected with a common potential (i.e., the second transparent conductive layer 105 is a common electrode layer connected with a common potential). When the liquid crystal layer 103 is a PDLC layer and no voltage is applied to the first transparent conductive layer 104 and the second transparent conductive layer 105, that is, when the transparent display panel 10 is in the absence of an applied voltage, a regular electric field cannot be formed between the first transparent substrate 101 and the second transparent substrate 102, the optical axes of the polymer dispersed liquid crystal particles are randomly oriented, a disordered state is presented, the effective refractive index of the disordered state is not matched with the refractive index of the polymer, and the transparent display panel 10 is in an opaque state, a semi-transparent state, or a fuzzy (flocculent) white state; when a voltage is applied to the first transparent conductive layer 104 and the second transparent conductive layer 105, that is, under the condition that the voltage is applied to the transparent display panel 10, a regular electric field is formed between the first transparent substrate 101 and the second transparent substrate 102 for adjusting the optical axis orientation of the polymer dispersed liquid crystal particles, the refractive index of the liquid crystal molecules is matched with that of the matrix, and the transparent display panel 10 is in a transparent state. The electric field formed between the first transparent conductive layer 104 and the second transparent conductive layer 105 of this embodiment can adjust the optical axis orientation of the polymer dispersed liquid crystal particles, and when the refractive index of the liquid crystal molecules after power-on matches the refractive index of the matrix, the transparent display panel 10 assumes a transparent state, and the polymer dispersed liquid crystal particles recover the original disordered state after the electric field is removed, thereby performing display.
Therefore, taking the liquid crystal layer 103 as a PDLC layer as an example, the transparent display panel 10 of this embodiment may control part of the conductive blocks of the block structure to be powered on by the external driving circuit, the remaining conductive blocks of the block structure are not powered on, so as to achieve the display and non-display of the transparent display panel 10, the area corresponding to the non-powered conductive blocks is in a flocculent and white display state, and the area corresponding to the powered conductive blocks is still in a transparent state, so that light can be transmitted through the solar charging panel 30 to be absorbed by the solar charging panel 30, and light energy can be continuously converted into electric energy, thereby having higher light energy utilization efficiency, being beneficial to enabling the display device of this embodiment to effectively combine the solar energy technology and the display technology, and utilizing the solar charging panel 30 to effectively convert light energy into self-generated electric energy, enabling the display device 000 to be capable of saving power consumption, the application range of the transparent display can be wider.
The transparent display panel of the present embodiment may be a PDLC panel or a PNLC panel, and the above embodiment takes the liquid crystal layer 103 as a PDLC layer as an example, and the liquid crystals of the PNLC layer and the PDLC layer have only different liquid crystal structural properties, and the principle of transparent display is the same as the display principle of the liquid crystal layer 103 as a PDLC layer, and both are in a non-transparent state in the absence of an applied voltage and are in a transparent state in the presence of an applied voltage.
When the liquid crystal layer 103 is a PDLC layer, the arrangement of liquid crystal particles inside the PDLC panel can be controlled by an external voltage to adjust the transparency of the panel, and under the condition that no external voltage is applied, the liquid crystal particles inside the PDLC panel are in a disordered state, and at this time, the panel is in an opaque state, a semi-transparent state or a fuzzy (flocculent) white state; when external voltage is applied to the PDLC panel, liquid crystal particles in the PDLC panel form a basically uniform medium, the refractive index of liquid crystal molecules is matched with that of a matrix, so that incident light cannot be scattered, and the panel is in a transparent state.
When the liquid crystal layer 103 is a PNLC layer, the arrangement of the liquid crystal channel network inside the PNLC panel can be controlled by an external voltage to realize the adjustment of the panel transparency, and under the condition that no external voltage is applied, the liquid crystal channel network inside the PNLC panel is in a disordered state, and at the moment, the panel is in an opaque state, a semi-transparent state or a fuzzy (flocculent) whitening state; when an external voltage is applied to the PNLC panel, the liquid crystal channel network in the PNLC panel forms a substantially uniform medium, so that incident light is not scattered, and the panel is in a transparent state. In specific implementation, the method can be selected according to actual requirements.
Moreover, the solar charging panel 30 of the present embodiment includes at least two charging units 300, and the orthographic projection of the charging unit 300 to the transparent display panel 10 is located within the range of the display area AA, so that the charging units 300 can be arranged as many as possible, which is beneficial to fully utilizing the solar technology, increasing the layout area for realizing the photoelectric conversion structure, and increasing the effective area of the solar charging panel 30. The at least two charging units 300 are respectively a first charging unit 301 and a second charging unit 302, the first charging unit 301 and the second charging unit 302 are electrically connected in series, the charging unit 300 connected in series is arranged in the solar charging panel 30, and because the voltage generated by the solar charging panel 30 is determined by the size of the electric field (namely the doping concentration of the PN junction) in the PN junction 3003 of the charging unit 300, the size of the solar charging panel 30 is irrelevant, and the area is increased only by increasing the output power (current), so that the charging units 300 can be connected in series to play a role of boosting as common batteries are connected in series, and more ideal photoelectric conversion efficiency can be realized. It should be noted that, this embodiment only illustrates the series connection relationship between the first charging unit 301 and the second charging unit 302, and in specific implementation, the structure for implementing the series connection in the solar charging panel 30 may be diversified, and this embodiment is not limited, and only needs to satisfy the requirement that the first charging unit 301 and the second charging unit 302 are connected in series to implement the boosting effect.
Optionally, as shown in fig. 5, fig. 5 is a schematic cross-sectional structure diagram of the charging units 300, each charging unit 300 includes a first electrode 3001 and a second electrode 3002 that are oppositely disposed along a direction Z perpendicular to the light emitting surface E of the transparent display panel 10, and a PN junction 3003 is disposed between the first electrode 3001 and the second electrode 3002, where each charging unit 300 of this embodiment utilizes a working principle of a solar cell, specifically, a photovoltaic effect of a semiconductor PN junction 3003. The PN junction 3003 is formed by using different doping processes, and by diffusion, a P-type semiconductor and an N-type semiconductor are fabricated on the same semiconductor (usually silicon or germanium) substrate, and a space charge region called a PN junction (PN junction) is formed at the interface between them. PN junctions have unidirectional conductivity and are the material basis for many devices in electronic technology, such as semiconductor diodes, bipolar transistors. The photovoltaic effect is an effect in which when an object is irradiated with light, a charge distribution state in the object changes to generate an electromotive force and a current. As shown in fig. 6, fig. 6 is a schematic diagram of the principle structure of the charging unit 300, and when sunlight or other light irradiates the PN junction 3003 of the semiconductor, a voltage, called a photogenerated voltage, appears across the PN junction 3003. When light is irradiated onto the PN junction 3003, electron-hole pairs are generated, and carriers generated in the vicinity of the PN junction 3003 in the semiconductor reach the space charge region (depletion region) without being recombined, and electrons flow into the N region and holes flow into the P region by the attraction of the internal electric field, so that the N region stores excess electrons and the P region has excess holes. They form a photogenerated electric field in the vicinity of the PN junction 3003 opposite to the barrier direction. Besides partially canceling the action of the barrier electric field, the photogenerated electric field also makes the P zone positive, the N zone negative, and the thin layer between the N zone and the P zone generates electromotive force, which is the photovoltaic effect. Sunlight irradiates on the PN junction 3003 to form new hole-electron pairs, holes flow from the N region to the P region and electrons flow from the P region to the N region under the action of an electric field built in the PN junction 3003, and current is generated by connecting an electric path.
Alternatively, the working principle of the PN junction 3003 is as shown in fig. 7 and 8, fig. 7 is a schematic diagram of applying a forward voltage to the PN junction, and fig. 8 is a schematic diagram of applying a reverse voltage to the PN junction, if the PN junction is applied with a forward voltage, i.e., the P region is connected to the positive electrode, and the N region is connected to the negative electrode, as shown in fig. 7, because the direction of the electric field of the applied voltage is opposite to the direction of the electric field in the PN junction, the internal electric field will be weakened under the action of the external electric field, so that the depletion region will be narrowed, and the diffusion motion will be enhanced, so that most carriers will continuously pass through the PN junction under the driving of the external electric field force to form a large diffusion current, which is. It can be seen that the resistance of the PN junction is very small when it is conducting in the forward direction. When reverse voltage is applied, the PN junction depletion region is widened, and reverse current is very small; if a reverse voltage is applied to the PN junction, as shown in fig. 8, the P region is connected to the negative electrode, and the N region is connected to the positive electrode, at this time, since the direction of the applied electric field is the same as the direction of the internal electric field, the internal electric field is enhanced, the diffusion motion of majority carriers is weakened, no forward current passes through the PN junction, only the drift motion of minority carriers forms a reverse current, and since the number of minority carriers is very small, the reverse current is very weak, and therefore, the resistance of the PN junction is very large under the reverse voltage. From the above analysis it can be seen that: the PN junction can conduct electricity when passing through forward voltage, and is often called as conduction; and is non-conductive when a reverse voltage is applied, which is often referred to as off, i.e., the PN junction has unidirectional conductivity.
The first electrode 3001 of the charging unit 300 of this embodiment is located on one side of the second electrode 3002 close to the transparent display panel 10, the first electrode 3001 is electrically connected to one pole of the power module 20 (which may be a rechargeable battery) through a first metal wire 41, the second electrode 3002 is electrically connected to the other pole of the power module 20 (which may be a rechargeable battery) through a second metal wire 42, the first metal wire 41 and the second metal wire 42 are used to electrically connect the charging unit 300 to the power module 20, and when the solar charging panel 30 converts solar energy into electric energy, the electric energy is transmitted to the power module 20 for charging. The orthographic projections of the first metal wires 41 and the second metal wires 42 to the transparent display panel 10 are all located within the range of the non-display area NA, so that the arrangement of the first metal wires 41 and the second metal wires 42 can be prevented from occupying the layout space of the charging unit 300, and the effective area of the solar charging panel 30 can be further improved.
In the embodiment, the transparent display panel 10 is combined with the solar charging panel 30, the solar charging panel 30 is integrated under the transparent display panel 10 in a film forming manner, and the boosting effect is realized by the structure of the charging unit 300 connected in series inside the solar charging panel 30; optionally, the transparent display panel 10 and the solar charging panel 30 may be fixed by a double-sided adhesive or a sealant. The transparent display panel 10 can have two states of display and non-display, in the non-display state, the whole transparent display panel 10 is in a transparent state, and light can completely penetrate through the transparent display panel 10 to be absorbed by the solar charging panel 30, so that light energy is converted into electric energy to charge the power module 20; in the display state, only the display area is in the opaque state or the flocculent whitish state, and the other non-display areas are still in the transparent state, and are still used for the transmission of light rays for the solar charging panel 30 to absorb, so as to continuously convert the light energy into the electric energy and continuously charge the power module 20. For example, the transparent display panel 10 is normally made of transparent glass, and when displaying, if a number is to be displayed, only the portion displaying the number is changed into an opaque state or a white-like state, and the other portion is still kept in a transparent state. The signal traces in the transparent display panel 10 can all adopt transparent traces, and the structure thereof is in a transparent state, so that the feasibility of simultaneous display and photoelectric conversion by combining the solar charging panel 30 is high. This embodiment has higher light energy utilization efficiency, can make display device effectively combine solar energy technology and display technology, utilize solar charging panel 30 to turn into the electric energy with light energy effective utilization, make display device 000 can generate electricity certainly, solar energy technology inexhaustible danger, safety and reliability, noiselessness, outside pollution-free emission, nuisanceless, do not receive the restriction in region, energy quality is high, be favorable to practicing thrift the consumption, and solar charging panel 30 does not influence the display effect, can make transparent display range of application more extensive. In addition, the solar charging panel 30 is provided with the charging unit 300 connected in series, so that the boosting effect can be further achieved, and the ideal photoelectric conversion efficiency can be realized.
In some alternative embodiments, with continuing reference to fig. 1, fig. 3-fig. 5 and fig. 9, fig. 9 is a schematic cross-sectional view of a charging unit 300, in which in the present embodiment, along a direction Z perpendicular to a light emitting surface E of the transparent display panel 10, the PN junction 3003 includes a P-type semiconductor 30031 and an N-type semiconductor 30032 which are stacked;
the first electrode 3001 is an anode, the second electrode 3002 is a cathode, the P-type semiconductor 30031 is located on a side of the first electrode 3001 close to the second electrode 3002, and the N-type semiconductor 30032 is located on a side of the P-type semiconductor 30031 close to the second electrode 3002 (see fig. 5);
alternatively, the first electrode 3001 is a negative electrode, the second electrode 3002 is a positive electrode, the N-type semiconductor 30032 is located on a side of the first electrode 3001 close to the second electrode 3002, and the P-type semiconductor 30031 is located on a side of the N-type semiconductor 30032 close to the second electrode 3002.
This embodiment further explains that the P-type semiconductor 30031 and the N-type semiconductor 30032 stacked in the PN junction 3003 can be disposed interchangeably, but the side close to the P-type semiconductor 30031 is the positive electrode of the charging unit 300, that is, as shown in fig. 5, when the P-type semiconductor 30031 is located on the side close to the second electrode 3002 of the first electrode 3001, and the N-type semiconductor 30032 is located on the side close to the second electrode 3002 of the P-type semiconductor 30031, the first electrode 3001 of the charging unit 300 is the positive electrode, and the second electrode 3002 is the negative electrode; as shown in fig. 9, when the N-type semiconductor 30032 is located on a side of the first electrode 3001 close to the second electrode 3002, and the P-type semiconductor 30031 is located on a side of the N-type semiconductor 30032 close to the second electrode 3002, the first electrode 3001 of the charging unit 300 is a negative electrode, and the second electrode 3002 is a positive electrode.
In some alternative embodiments, please continue to refer to fig. 1-4, in this embodiment, the first electrode 3001 of the first charging unit 301 and the second electrode 3002 of the second charging unit 302 are electrically connected through the connecting portion 3004;
in a direction X parallel to the light emitting surface E of the transparent display panel 10, a first insulating portion 3005 is disposed between the connecting portion 3004 and the PN junction 3003 and the second electrode 3002 of the first charging unit 301, and a second insulating portion 3006 is disposed between the connecting portion 3004 and the first electrode 3001 and the PN junction 3003 of the second charging unit 302;
the first electrode 3001 of the second charging unit 302 is electrically connected to one pole of the power module 20 through one first metal wire 41; the second electrode 3002 of the first charging unit 301 is electrically connected to the other electrode of the power module 20 through one second metal wire 42.
This embodiment further illustrates an alternative structure for realizing the series electrical connection of at least two charging units 300 in the solar charging panel 30, wherein the first electrode 3001 of the first charging unit 301 and the second electrode 3002 of the second charging unit 302 are electrically connected through the connection portion 3004, and the first electrode 3001 of the second charging unit 302 is electrically connected with one pole of the power module 20 through one first metal wire 41; the second electrode 3002 of the first charging unit 301 is electrically connected to the other pole of the power module 20 through a second metal wire 42, that is, the first electrode 3001 (positive pole or negative pole) of the previous charging unit 300 is electrically connected to the second electrode 3002 (negative pole or positive pole) of the next charging unit 300, at this time, the first electrode 3001 of the next charging unit 300 is electrically connected to one pole of the power module 20 through a first metal wire 41, and the second electrode 3002 of the previous charging unit 300 is electrically connected to the other pole of the power module 20 through a second metal wire 42, so that at least two charging units 300 can perform a boosting function as a common battery in series connection, and a relatively ideal photoelectric conversion efficiency can be achieved. The first insulating portion 3005 is used to insulate and isolate the connecting portion 3004 from the second electrode 3002 of the first charging unit 301, and prevent the connecting portion 3004 from being shorted with the second electrode 3002 of the first charging unit 301, and the second insulating portion 3006 is used to insulate and isolate the connecting portion 3004 from the first electrode 3001 of the second charging unit 302, and prevent the connecting portion 3004 from being shorted with the first electrode 3001 of the second charging unit 302.
It should be noted that, when the solar charging panel 30 includes at least three or more charging units 300 connected in series, the sectional structure diagram thereof is shown in fig. 10, fig. 10 is a schematic sectional structure diagram illustrating that three charging units 300 of the embodiment are electrically connected in series, and when the solar charging panel 30 includes three charging units 300 connected in series, which are respectively a first charging unit 301, a second charging unit 302, and a third charging unit 303;
at this time, the first electrode 3001 of the first charging unit 301 and the second electrode 3002 of the second charging unit 302 are electrically connected by the first connection portion 30041, and the second electrode 3002 of the second charging unit 302 and the first electrode 3001 of the third charging unit 303 are electrically connected by the second connection portion 30042; in a direction X parallel to the light emitting surface E of the transparent display panel 10, a first insulating portion 3005 is disposed between the first connecting portion 30041 and the PN junction 3003 and the second electrode 3002 of the first charging unit 301, a second insulating portion 3006 is disposed between the first connecting portion 30041 and the first electrode 3001 and the PN junction 3003 of the second charging unit 302, a third insulating portion 3007 is disposed between the second connecting portion 30042 and the PN junction 3003 and the first electrode 3001 of the second charging unit 302, and a fourth insulating portion 3008 is disposed between the second connecting portion 30042 and the second electrode 3001 and the PN junction 3003 of the third charging unit 302; the second electrode 3002 of the third charging unit 303 is electrically connected to one pole of the power module 20 through one first metal wire 41; the second electrode 3002 of the first charging unit 301 is electrically connected to the other electrode of the power module 20 through a second metal wire 42, so that the three charging units 300 can perform a boosting function like a normal battery in series connection, and a relatively ideal photoelectric conversion efficiency can be achieved.
It should be further noted that fig. 1-4 are only schematic structural diagrams illustrating that the solar charging panel 30 includes two charging units 300 electrically connected in series, fig. 10 is only schematic structural diagrams illustrating that the solar charging panel 30 includes three charging units 300 electrically connected in series, when the solar charging panel 30 includes four charging units 300, as shown in fig. 11, fig. 11 is a schematic plane structural diagram of another display device provided by the embodiment of the present invention, in the display device 000 of the embodiment, the solar charging panel 30 includes not only the first charging unit 301 and the second charging unit 302 in the first direction X1, but also the third charging unit 303 and the fourth charging unit 304 in the second direction X2, the series electrical connection structure of the four charging units 300 can be connected to the second electrode 3002 (negative electrode or positive electrode) of the second charging unit 300 through the first electrode 3001 (positive electrode or negative electrode) of the first charging unit 300, the second electrode 3002 (negative electrode or positive electrode) of the second charging unit 300 is connected to the first electrode 3001 (positive electrode or negative electrode) of the third charging unit 300, the first electrode 3001 (positive electrode or negative electrode) of the third charging unit 300 is connected to the second electrode 3002 (negative electrode or positive electrode) of the fourth charging unit 300, at this time, the first electrode 3001 of the fourth charging unit 300 may be electrically connected to one pole of the power module 20 through a first metal wire 41, and the second electrode 3002 of the first charging unit 300 may be electrically connected to one pole of the power module 20 through a second metal wire 42, so that the three charging units 300 may perform a boosting function as a normal battery, and further achieve a desirable photoelectric conversion efficiency.
In some optional embodiments, please refer to fig. 12 and 13, fig. 12 is a schematic plan view illustrating another display device according to an embodiment of the present invention, and fig. 13 is a block diagram illustrating an electrical connection structure of the display device of fig. 12, in this embodiment, the solar charging panel 30 includes at least two charging groups 50, each charging group 50 includes at least two charging units 300 connected in series, the first electrode 3001 of each charging group 50 is electrically connected to one pole of the power module 20 through one first metal line 41, and the second electrode 3002 of each charging group 50 is electrically connected to the other pole of the power module 20 through one second metal line 42.
The present embodiment further illustrates that the solar charging panel 30 includes at least two charging groups 50, fig. 12 exemplifies that the solar charging panel 30 includes four charging groups 50, each charging group 50 includes at least two charging units 300 connected in series, the first electrode 3001 of each charging group 50 is electrically connected to one pole of the power module 20 through one first metal wire 41, respectively, the second electrode 3002 of each charging group 50 is electrically connected to the other pole of the power module 20 through one second metal wire 42, respectively, for example, the solar charging panel 30 includes a first charging group 501, a second charging group 502, a third charging group 503, and a fourth charging group 504, the first electrodes 3001 of the first charging group 501 are electrically connected to one pole of the power module 20 through the same first metal wires 41(1), respectively, and the second electrodes 3002 of the first charging group 501 are electrically connected to the other pole of the power module 20 through the same second metal wires 42(1), respectively; the first electrodes 3001 of the second charging group 502 are electrically connected to one electrode of the power module 20 through the same first metal line 41(2), and the second electrodes 3002 of the second charging group 502 are electrically connected to the other electrode of the power module 20 through the same second metal line 42 (2); the first electrodes 3001 of the third charging group 503 are electrically connected to one electrode of the power module 20 through the same first metal lines 41(3), and the second electrodes 3002 of the third charging group 503 are electrically connected to the other electrode of the power module 20 through the same second metal lines 42 (3); the first electrodes 3001 of the fourth charging group 504 are electrically connected to one electrode of the power module 20 through the same first metal lines 41(4), and the second electrodes 3002 of the fourth charging group 504 are electrically connected to the other electrode of the power module 20 through the same second metal lines 42 (4). The solar charging panel 30 of the present embodiment includes at least two charging sets 50, each charging set 50 is electrically connected in parallel, and each charging unit 300 in each charging set 50 is electrically connected in series, because each charging set 50 is electrically connected in parallel, even if there is no light irradiation in the area corresponding to one of the charging sets 50, the light energy cannot be converted into electric energy to generate electricity, the remaining charging sets 50 can still charge the power module 20 through the first metal wire 41 and the second metal wire 42 which are electrically connected to themselves, and the solar charging panel 30 can still be used normally. Thereby this embodiment can realize the effect that steps up, can also promote voltage output's stability, avoid appearing leading to when partly sheltering from because of transparent display panel 10's screen to correspond the region not have light irradiation, can not generate electricity with light energy conversion to electric energy, and then cause the problem that solar charging panel 30's output voltage descends.
It should be noted that, the charging groups 50 of the present embodiment are electrically connected in parallel, and through the above-mentioned parallel electrical connection structure shown in fig. 12 and fig. 13, the power module 20 may be further designed to include a plurality of control terminals, and each control terminal individually controls the input of each charging group 50.
In some alternative embodiments, with reference to fig. 1-5, in the present embodiment, in one charging unit 300, the first electrode 3001 includes a plurality of strip sub-electrodes 30011, and the second electrode 3002 is a whole block structure.
The present embodiment further explains that the first electrode 3001 near one side of the transparent display panel 10 includes a plurality of strip-shaped sub-electrodes 30011, so that the solar power generation function can be realized, and at the same time, the contact area between the PN junction 3003 and light can be increased as much as possible, so that the PN junction 3003 is irradiated by light as much as possible, and the photoelectric conversion utilization rate of the display device is further improved.
It should be noted that, this embodiment is only an example that the first electrode 3001 may include a plurality of strip-shaped sub-electrodes 30011 to expose the PN junction 3003 with an area as large as possible for being irradiated by light, but the first electrode 3001 is not limited to this structure, and may also include a plurality of block-shaped or checkerboard-shaped structures, which only needs to satisfy that the contact area between the PN junction 3003 and light is as large as possible, and this embodiment is not repeated.
In some alternative embodiments, referring to fig. 1 to fig. 5, in the present embodiment, in the same charging unit 300, the plurality of strip sub-electrodes 30011 of the first electrode 3001 are electrically connected to one electrode of the power module 20 through the same first metal line 41.
The present embodiment further explains that in the same charging unit 300, the plurality of strip-shaped sub-electrodes 30011 of the first electrode 3001 are electrically connected to one electrode of the power module 20 through the same first metal wire 41, so that the plurality of strip-shaped sub-electrodes 30011 of each charging unit 300 are connected to the same first metal wire 41 and are electrically connected to one electrode of the power module 20 as a whole, although the first electrode 3001 is designed to be a plurality of strip-shaped sub-electrodes 30011 in order to increase the contact area between the PN junction 3003 and light as much as possible, the photoelectric conversion effect of the solar charging panel 30 is still not affected.
In some optional embodiments, referring to fig. 14, fig. 14 is a schematic plan view illustrating another display device according to an embodiment of the present invention, in this embodiment, in the same charging unit 300, each strip-shaped sub-electrode 30011 of the first electrode 3001 is electrically connected to one electrode of the power module 20 through one first metal line 41.
This embodiment further explains that, in the same charging unit 300, each strip-shaped sub-electrode 30011 of the first electrode 3001 is electrically connected to one pole of the power module 20 through one first metal wire 41, and each strip-shaped sub-electrode 30011 in the same charging unit 300 is electrically connected to one pole of the power module 20 through one first metal wire 41, that is, each strip-shaped sub-electrode 30011 is electrically connected to one pole of the power module 20 in parallel through one first metal wire 41, even if one or more strip-shaped sub-electrodes 30011 in the charging unit 300 have a problem (for example, when a small portion of the screen is shielded to shield the strip-shaped sub-electrode 3001 in the area and cannot convert light energy into electric energy for power generation), because each strip-shaped sub-electrode 30011 is connected in parallel, the remaining strip-shaped sub-electrodes 30011 in the charging unit 300 can be normally used, so as to reduce the influence on the solar power generation effect of the charging unit 300 as much as possible, the stability of the output voltage is ensured.
In some alternative embodiments, please refer to fig. 1 and fig. 15, fig. 15 is another electrical connection structure block diagram of the display device of fig. 1, and the display device 000 in this embodiment further includes a display driving module 60, and the display driving module 60 is electrically connected to the transparent display panel 10 and the power module 20, respectively.
The embodiment further explains that the display device 000 further includes a display driving module 60 for providing a display driving signal, the optional display driving module 60 may be a driving chip, and the display driving module 60 is electrically connected to the transparent display panel 10 and the power module 20, that is, the power module 20 may provide power for the transparent display panel 10 and may also provide power for the display driving module 60, which is beneficial to further saving the power consumption of the display device 000.
In some alternative embodiments, please refer to fig. 1-5 with continued reference, in the present embodiment, the first metal line 41 and the first electrode 3001 are disposed at the same layer, and the second metal line 42 and the second electrode 3002 are disposed at the same layer.
The present embodiment further explains that the first metal line 41 and the second metal line 42 may be layered within the range of the non-display area NA in which the orthographic projections of the transparent display panel 10 are both located, so as to be beneficial to narrowing the frame of the display device, and optionally, the first metal line 41 and the first electrode 3001 are disposed in the same layer, and the second metal line 42 and the second electrode 3002 are disposed in the same layer, which may also improve the process efficiency and simplify the process flow.
As can be seen from the above embodiments, the display device provided by the present invention at least achieves the following beneficial effects:
the solar charging system combines the transparent display panel with the solar charging panel, integrates the solar charging panel under the transparent display panel in a film forming mode, and realizes the boosting effect through the charging unit structure connected in series in the solar charging panel. The transparent display panel can be in a display state and a non-display state, the whole transparent display panel is in the transparent state in the non-display state, and light rays can completely penetrate through the transparent display panel to be absorbed by the solar charging panel, so that light energy is converted into electric energy to charge the power supply module; and in the display state, only the display area is in a non-transparent state or a flocculent whitening state, and other non-display areas are still in a transparent state, are still used for the penetration of light rays for the solar charging panel to absorb, continue to convert the light energy into the electric energy, and continuously charge the power module. The solar energy display panel has higher light energy utilization efficiency, can effectively combine a solar energy technology with a display technology, and utilizes the solar charging panel to effectively utilize the light energy and convert the light energy into electric energy, so that the display device can generate electricity automatically. The solar charging panel is internally provided with the charging units connected in series, so that the boosting effect can be further realized, and the ideal photoelectric conversion efficiency can be realized.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (11)

1. A display device, comprising: the solar charging system comprises a transparent display panel, a power supply module and a solar charging panel, wherein the solar charging panel is positioned on one side of the transparent display panel;
the power module is electrically connected with the transparent display panel, and the solar charging panel is electrically connected with the power module;
the solar charging panel comprises at least two charging units which are respectively a first charging unit and a second charging unit, the first charging unit and the second charging unit are electrically connected in series, and the orthographic projection of the charging unit to the transparent display panel is positioned in the range of the display area;
along the direction perpendicular to the light-emitting surface of the transparent display panel, each charging unit comprises a first electrode and a second electrode which are oppositely arranged, and a PN junction is arranged between the first electrode and the second electrode;
the first electrode is positioned on one side of the second electrode close to the transparent display panel, the first electrode is electrically connected with one pole of the power module through a first metal wire, and the second electrode is electrically connected with the other pole of the power module through a second metal wire;
the orthographic projections of the first metal lines and the second metal lines to the transparent display panel are both located in the range of the non-display area.
2. The display device according to claim 1, wherein the PN junction comprises a P-type semiconductor and an N-type semiconductor stacked in a direction perpendicular to a light exit surface of the transparent display panel;
the first electrode is an anode, the second electrode is a cathode, the P-type semiconductor is positioned on one side of the first electrode close to the second electrode, and the N-type semiconductor is positioned on one side of the P-type semiconductor close to the second electrode;
or, the first electrode is a negative electrode, the second electrode is a positive electrode, the N-type semiconductor is located on one side of the first electrode close to the second electrode, and the P-type semiconductor is located on one side of the N-type semiconductor close to the second electrode.
3. The display device according to claim 1, wherein the first electrode of the first charging unit and the second electrode of the second charging unit are electrically connected through a connecting portion;
in a direction parallel to the light emitting surface of the transparent display panel, a first insulating part is arranged between the connecting part and the PN junction and the second electrode of the first charging unit, and a second insulating part is arranged between the connecting part and the first electrode and the PN junction of the second charging unit;
the first electrode of the second charging unit is electrically connected with one pole of the power supply module through one first metal wire; the second electrode of the first charging unit is electrically connected with the other electrode of the power module through one second metal wire.
4. The display device as claimed in claim 1, wherein the solar charging panel comprises at least two charging groups, each charging group comprises at least two charging units connected in series, the first electrode of each charging group is electrically connected to one pole of the power module through one first metal wire, and the second electrode of each charging group is electrically connected to the other pole of the power module through one second metal wire.
5. The display device according to claim 4, wherein the charging groups are electrically connected in parallel.
6. The display device according to claim 1, wherein the first electrode includes a plurality of stripe sub-electrodes and the second electrode has a full-area block structure in one of the charging units.
7. The display device according to claim 6, wherein the plurality of bar-shaped sub-electrodes of the first electrode are electrically connected to one electrode of the power supply module through the same first metal line in the same charging unit.
8. The display device according to claim 6, wherein each of the strip sub-electrodes of the first electrode is electrically connected to one electrode of the power module through one of the first metal lines in the same charging unit.
9. The display device according to claim 1, further comprising a display driving module electrically connected to the transparent display panel and the power module, respectively.
10. The display device according to claim 1, wherein the first metal line and the first electrode are disposed in the same layer, and wherein the second metal line and the second electrode are disposed in the same layer.
11. The display device according to claim 1, wherein the transparent display panel comprises a first transparent substrate and a second transparent substrate which are oppositely arranged, and a liquid crystal layer sandwiched between the first transparent substrate and the second transparent substrate, in a direction perpendicular to a light emitting surface of the transparent display panel, wherein the liquid crystal layer comprises polymer dispersed liquid crystal;
the first transparent substrate comprises a plurality of pixels arranged in an array, the pixels comprise pixel electrodes, the second transparent substrate comprises a common electrode layer, and the common electrode layer is connected with a common potential.
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