Display screen structure, device and preparation method with integrated solar cell function

Abstract

The present invention relates to a display screen structure, a display device and a preparation method of an integrated solar cell function, wherein the display screen structure integrated with a solar cell function comprises a transparent solar cell unit for absorbing polarized light in a first direction and a display unit for emitting polarized light in a second direction, the transparent solar cell unit is arranged above the display unit, and the first direction and the second direction are perpendicular to each other. Compared with the existing display screen structure, the polarization direction of light absorbed by the transparent solar cell unit of the display screen structure of the present invention is perpendicular to the polarization direction of light emitted by the display unit, and the light emitted by the display unit can pass through the transparent solar cell unit with almost no loss, that is, the transparent solar cell unit will not absorb the light emitted by the display unit, so arranging the transparent solar cell unit above the display unit will not increase the power consumption of the display screen and will not affect the display characteristics such as brightness, viewing angle and response time.

Description

Technical Field

[0001] The present invention relates to the field of display screen technology and photovoltaic technology, and in particular to a display screen structure, a display device and a preparation method thereof that integrates a solar cell function. Background Art

[0002] With the popularity of mobile electronic devices, users' performance requirements are increasing day by day, and energy consumption is also increasing accordingly. The rate of increase in lithium battery capacity is gradually unable to meet the usage needs. Organic light-emitting diode (OLED) display technology has the advantages of self-luminescence, high contrast, wide viewing angle, fast response speed, and low energy consumption. As a new generation of display technology to replace liquid crystal display (LCD), it can alleviate the contradiction between performance requirements and battery life of mobile electronic devices to a certain extent. In addition, some research works hope to integrate solar cells on the screens of mobile phones, tablets and other devices, so that the display screen can absorb sunlight or ambient light while playing the picture to charge the device, thereby increasing the battery life and solving the charging problem in emergency situations. At present, display screens with integrated solar charging functions usually adopt the following methods:

[0003] One is to place the solar cell unit behind the display unit. In this structure, the light emitted by the display unit forward does not pass through the solar cell unit, so the display brightness, viewing angle and other parameters will not be affected. However, this structure requires that the entire structure of the unit unit has a relatively high transparency. The light utilization rate of the solar cell unit is largely restricted by the transmittance of the transparent electrode in the display unit and the shielding of the TFT circuit. In addition, in this structure, there cannot be a reflective structure between the display unit and the solar cell unit, so the light emitted by the display unit to the rear will be absorbed by the solar cell, reducing the utilization rate of the display light.

[0004] The second is to place the solar cell unit above the display unit, such as the Wysips Crystal photovoltaic module developed by Sunpartner Technologies of France. Its design principle is to add a series of strip-shaped solar cells with intervals between the display screen and the outer glass, and process the outer glass into a series of corresponding lens shapes. Through lens technology, sunlight or artificial light is converged by the semi-cylindrical lens onto the solar cell strip, and the light emitted by the display screen is transmitted from the interval, thereby realizing the dual functions of solar charging and screen display. However, the disadvantage of this design is that the strip structure blocks a part of the display area, which will reduce the display resolution. In addition, the lens structure will also bring about the problem of limited viewing angle. The existing Chinese invention patent application specification CN105070218A also discloses a solar display screen, wherein the transparent solar film is formed on the OLED display module, and the incident light is irradiated to the transparent solar film through the cover plate, and the light emitted by the organic light-emitting layer is emitted through the transparent solar film and the cover plate in turn. Although the transparent solar film is not covered and can effectively absorb ambient light, it is also easy to absorb the light emitted by the OLED display module, causing the display brightness of the OLED display module to decrease. Summary of the invention

[0005] To solve the above problems, the present invention provides a display screen structure, a display device and a preparation method with integrated solar cell function to solve the technical problem in the prior art that transparent solar cell units are prone to absorb light emitted by the display unit, thereby affecting the display brightness of the display unit.

[0006] To solve the above-mentioned purpose, the present invention adopts the following technical solution.

[0007] The present invention provides a display screen structure with integrated solar cell function, comprising a transparent solar cell unit for absorbing polarized light in a first direction and a display unit for emitting polarized light in a second direction. The transparent solar cell unit is arranged above the display unit, and the first direction and the second direction are perpendicular to each other.

[0008] Furthermore, the transparent solar cell unit is provided with a first insulating layer, a first positive electrode layer, a first hole transport layer, a polymer light absorbing layer, a first electron transport layer and a common negative electrode layer in sequence from top to bottom. The common negative electrode layer is directly grown on the display unit, and the polymer molecules of the polymer light absorbing layer are oriented along a first direction.

[0009] Furthermore, the polymer light-absorbing layer is mainly a bulk heterojunction structure composed of a mixture of an electron donor material and an acceptor material, wherein the donor material is mainly polythiophene, poly(p-phenylene vinylene), polybenzodithiophene, polybenzothiadiazole, polypyrrole, a copolymer of porphyrin and thiophene, and one or more combinations of their diffractions, and the acceptor material is mainly C 60and its diffractor PC 60 BM, PC 70 The first insulating layer is a glass or transparent insulating polymer film covering layer.

[0010] Furthermore, the display unit is provided with a common negative electrode layer, a second electron transport layer, a polymer light-emitting layer, a second hole transport layer, a second positive electrode layer and a second insulating layer in sequence from top to bottom; the transparent solar cell unit is directly grown on the common negative electrode layer; the polymer molecules of the polymer light-emitting layer are oriented along a second direction; and the second insulating layer is a glass or plastic film substrate.

[0011] Furthermore, the polymer light-emitting layer is mainly prepared from a conjugated polymer light-emitting material, and the conjugated polymer light-emitting material is a combination of one or more of polyfluorene, polythiophene, polyparaphenylene vinylene, polyphenylene, polyaniline and their derivatives.

[0012] The present invention also provides a display device comprising the display screen structure of the integrated solar cell described above, and also includes a power management module and a secondary battery. The display screen structure includes a transparent solar cell unit for absorbing polarized light in a first direction and a display unit for emitting polarized light in a second direction. The transparent solar cell unit is arranged above the display unit, and the first direction and the second direction are perpendicular to each other. The transparent solar cell unit is provided with a first positive electrode layer, the display unit is provided with a second positive electrode layer, and a common negative electrode layer is provided between the transparent solar cell unit and the display unit. Wires are respectively led out from the first positive electrode layer, the second positive electrode layer and the common negative electrode layer and connected to the power management module, and the power management module is electrically connected to the secondary battery.

[0013] The present invention also provides a method for preparing a display screen structure with integrated solar cells, comprising the following steps:

[0014] S1, a glass or plastic film substrate is used as the second insulating layer, and an Au layer is evaporated on the surface of the glass or plastic film substrate by vacuum thermal evaporation coating method as the second positive electrode layer;

[0015] S2, coating a PEDOT:PSS aqueous solution on the surface of the second positive electrode layer, and annealing it to obtain a second hole transport layer;

[0016] S3, preparing a conjugated polymer light-emitting film oriented along a second direction on the surface of the second hole transport layer by molecular orientation treatment, as a polymer light-emitting layer of the display unit;

[0017] S4, sequentially depositing an Alq3 layer and a LiF layer on the surface of the polymer light-emitting layer by a vacuum thermal evaporation coating method as a second electron transport layer;

[0018] S5, depositing an ITO layer on the surface of the second electron transport layer by magnetron sputtering as a common negative electrode layer;

[0019] S6, coating a CsCO3:TiO2 mixed solution on the surface of the common negative electrode layer, and performing an annealing treatment to obtain a first electron transport layer;

[0020] S7, preparing a polymer light-absorbing layer oriented along a first direction on the surface of the first electron transport layer by molecular orientation treatment, wherein the angle between the first direction and the second direction is 90°.

[0021] S8, coating the surface of the polymer light absorbing layer with an isopropanol solution of PEDOT:PSS, and performing annealing treatment to obtain a first hole transport layer;

[0022] S9, depositing an ITO layer on the first hole transport layer by a magnetron sputtering method as a first positive electrode layer;

[0023] S10, covering the first insulating layer on the surface of the first positive electrode layer by using a dispensing process.

[0024] Specifically, in step S3 or step S7, the molecular orientation treatment method can be one or more methods of surface friction method, mechanical stretching method, friction transfer method, Langmuir-Blodgett deposition technology, liquid crystal polymer self-assembly method and ultraviolet light induced orientation method, so as to cause the polymer material molecules to be arranged in an orderly manner along the selected direction. Preferably, in step S3 or step S7, the molecular orientation treatment method adopts surface friction method, wherein:

[0025] In step S3, a xylene solution containing a conjugated polymer light-emitting material is coated on the surface of the second hole transport layer to form a conjugated polymer light-emitting film; a velvet cloth is used to rub the surface of the conjugated polymer light-emitting film along the selected second direction for 20 to 200 times, and then the conjugated polymer light-emitting film is cooled to room temperature to obtain a polymer light-emitting layer oriented along the second direction; then, the surface of the polymer light-emitting layer is cleaned by blowing nitrogen;

[0026] In step S7, chlorobenzene mixed with donor material and acceptor material is coated on the surface of the first electron transport layer to form a bulk heterojunction film; after rubbing the surface of the bulk heterojunction film along the selected first direction with a velvet cloth for 20 to 200 times, the bulk heterojunction film is cooled to room temperature to obtain a polymer light-absorbing layer oriented along the first direction, and the angle between the first direction and the second direction is 90°; and the surface of the polymer light-emitting layer is blown clean with nitrogen.

[0027] Specifically, the volume ratio of PEDOT:PSS stock solution to deionized water in the PEDOT:PSS aqueous solution involved in the above preparation method is 1:4; the conjugated polymer luminescent material is 9,9-dioctyl polyfluorene-benzothiadiazole alternating copolymer, and the concentration of the mixed solution is 5-20 mg / ml; the CsCO3:TiO2 mixed solution is mainly composed of 0.2-0.8wt% CSCO3 solution and 0.2-0.8wt% TiO2 solution in a volume ratio of 1:1; the donor material is PFBT, and the acceptor material is PC 70 BM, PFBT and PC 70 BM was mixed in chlorobenzene at a mass ratio of 2:3, and the concentration of the mixed solution was about 25 mg / ml; the volume ratio of the PEDOT:PSS stock solution to isopropanol in the PEDOT:PSS isopropanol solution was 1:2.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1. In the display screen structure with integrated solar cell function of the present invention, the transparent solar cell unit is arranged above the display unit. On the one hand, the entire screen area can be used as the light receiving area to the maximum extent to charge the secondary battery of the mobile electronic device including the display screen structure, thereby increasing the battery life of the device; on the other hand, the transparent solar cell unit can absorb most of the ambient light, which can reduce the reflection of light and improve the display contrast of the display screen area to a certain extent;

[0030] 2. In the display screen structure with integrated solar cell function of the present invention, the polarization direction of light absorbed by the transparent solar cell unit is perpendicular to the polarization direction of light emitted by the display unit, and the light emitted by the display unit can pass through the transparent solar cell unit almost without loss, that is, the transparent solar cell unit will not absorb the light emitted by the display unit, so that the transparent solar cell unit is arranged above the display unit, and the power consumption of the display screen will not be increased, and the display characteristics such as brightness, viewing angle and response time will not be affected;

[0031] 3. The display device of the present invention comprises a power management module, a secondary battery and a display screen structure with integrated solar cell function of the present invention. The positive electrode of the transparent solar cell unit, the positive electrode of the display unit and the common negative electrode of the transparent solar cell unit and the display unit are electrically connected to the power management module respectively. Through the logic control of the power management module, the electric energy generated by the transparent solar cell unit is used to charge the secondary battery or the electric energy of the secondary battery is used to control the display unit to emit light. At the same time, the transparent solar cell unit allows the display light emitted by the display unit to pass through with almost no absorption, which will not affect the display effect of the screen, but can absorb ambient light and convert it into electric energy as an energy supplement for the secondary battery, and can reduce the background light reflected by the surface, thereby improving the contrast of the display screen.

[0032] 4. In the preparation method of the present invention, the transparent solar cell unit is directly grown on the display unit, and the polymer molecules in the polymer light-emitting layer of the display unit and the polymer light-absorbing layer of the transparent solar cell unit are uniformly oriented and arranged along their respective selected directions through molecular orientation technology, so that the orientation directions of the polymer molecules of the display unit and the polymer molecules of the solar cell are perpendicular to each other, thereby obtaining a display screen structure with integrated solar cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a display screen structure according to an embodiment of the present invention;

[0034] Figure 2 A schematic cross-sectional view of a display screen structure according to an embodiment of the present invention

[0035] Figure 3 A circuit schematic diagram of a display device according to an embodiment of the present invention;

[0036] Figure 4 A circuit schematic diagram of a display device according to an embodiment of the present invention;

[0037] Figure 5 The present invention is a flow chart of a preparation method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] Figure 1 and Figure 2 Shown is a display screen structure according to an embodiment of the present invention.

[0040] In order to solve the technical problem in the prior art that the transparent solar cell unit is easy to absorb the light emitted by the display unit and affect the display brightness of the display unit, the display screen structure with integrated solar cell function of the present invention includes a transparent solar cell unit 100 for absorbing polarized light in a first direction and a display unit 200 for emitting polarized light in a second direction. The transparent solar cell unit 100 is arranged above the display unit 200, and the first direction and the second direction are perpendicular to each other. Therefore, the polarization direction of the light absorbed by the selected transparent solar cell unit 100 is perpendicular to the polarization direction of the light emitted by the display unit 200, so that the light emitted by the display unit 200 can pass through the transparent solar cell unit 100 with almost no loss, will not affect the display effect of the screen, and can reduce the background light reflected by the surface, thereby improving the contrast of the display screen.

[0041] Specifically, refer to Figure 2The transparent solar cell unit 100 selected in this embodiment is provided with a first insulating layer 101, a first positive electrode layer 102, a first hole transport layer 103, a polymer light absorbing layer 104, a first electron transport layer 105 and a common negative electrode layer 106 from top to bottom. The common negative electrode layer 106 is directly grown on the display unit 200. The polymer molecules of the polymer light absorbing layer 104 are oriented along a first direction, so that the polymer light absorbing layer 104 absorbs polarized light in the first direction. The display unit 200 is provided with a common negative electrode layer 201, a second electron transport layer 20 2. The polymer light-emitting layer 203, the second hole transport layer 204, the second positive electrode layer 205 and the second insulating layer 206. The transparent solar cell unit 100 is directly grown on the common negative electrode layer 106. The polymer molecules of the polymer light-emitting layer 203 are oriented and arranged along the second direction, so that the polymer light-emitting layer 203 emits polarized light in the second direction. The second insulating layer 206 is a glass or plastic film substrate. Therefore, the transparent solar cell unit 100 and the display unit 200 in this embodiment are an integrated structure, and the common negative electrode layer external power management circuit is used together, which is simple to use. In the existing, a separate solar cell unit 100 for absorbing light in a specific direction and a display unit 200 for emitting light in a specific direction can be realized, such as a polarized solar cell device and a polymer polarized light-emitting device. Other implementation schemes use transparent solar cell units and display units with different layer structures, and the selected transparent solar cell unit can absorb light in a specific direction and the display unit can emit polarized light perpendicular to the absorption direction. They are also within the scope of protection of the present invention and will not be described one by one here.

[0042] Specifically, the polymer light-absorbing layer 104 of the present embodiment is mainly a bulk heterojunction structure composed of a mixture of an electron donor material and an acceptor material. The donor material is mainly polythiophene, poly(p-phenylene vinylene), polybenzodithiophene, polybenzothiadiazole, polypyrrole, a copolymer of porphyrin and thiophene, and one or more combinations of their diffractions. The acceptor material is mainly C 60 and its diffractor PC 60 BM, PC 70 The first insulating layer 101 is a glass or transparent insulating polymer film covering layer; the polymer light-emitting layer 203 is mainly prepared from a conjugated polymer light-emitting material, and the conjugated polymer light-emitting material is a combination of one or more of polyfluorene, polythiophene, poly(p-phenylene vinylene), polyphenylene, polyaniline and their derivatives.

[0043] Figure 3 and Figure 4The display device of one embodiment of the present invention is shown. The display device of this embodiment includes a power management module 300, a secondary battery 400, and a display screen structure with integrated solar cell function, the display screen structure includes a transparent solar cell unit 100 for absorbing polarized light in a first direction and a display unit 200 for emitting polarized light in a second direction, the transparent solar cell unit 100 is arranged above the display unit 200, and the first direction and the second direction are perpendicular to each other, with reference to Figure 4 The transparent solar cell unit is provided with a first positive electrode layer 102, the display unit is provided with a second positive electrode layer 205, and a common negative electrode layer 201, 106 is provided between the transparent solar cell unit and the display unit. The first positive electrode layer 102, the second positive electrode layer 205 and the common negative electrode layer 201, 106 are respectively led out with wires and connected to the power management module 300, and the power management module 300 is electrically connected to the secondary battery 400. In combination with the display screen structure with integrated solar cell function of this embodiment, and through the logic control of the power management module 300, the electric energy generated by the transparent solar cell unit 100 is used to charge the secondary battery or use the electric energy of the secondary battery to control the display The unit 200 emits light, and the transparent solar cell unit 100 will not affect the display effect of the screen, and can reduce the background light reflected by the surface, thereby improving the contrast of the display screen. Specifically, the transparent solar cell unit 100 of this embodiment is provided with a first insulating layer 101, a first positive electrode layer 102, a first hole transport layer 103, a polymer light absorbing layer 104, a first electron transport layer 105 and a common negative electrode layer 106 from top to bottom; the display unit 200 of this embodiment is provided with a common negative electrode layer 201, a second electron transport layer 202, a polymer light emitting layer 203, a second hole transport layer 204, a second positive electrode layer 205 and a second insulating layer 206 from top to bottom.

[0044] Figure 5 A method flow chart of a preparation method of an embodiment of the present invention is shown. It should be noted that the electron transport layer and the hole transport layer in the respective structures of the display unit and the solar cell unit of the present invention do not necessarily use the same material and structure, and the type and thickness of the electron / hole transport layer material in each unit can be selected based on comprehensive consideration of factors such as energy level matching and carrier balance; the orientation arrangement of the present invention should be understood as: in the bulk material or thin film material, most of the material molecules are roughly arranged along a preferred direction (director), and the degree of orientation order should satisfy the order parameter (Order parameter) S ≥ 0.8.

[0045] In the preparation method of this embodiment, the display unit uses: a glass substrate as the second insulating layer, gold as the second positive electrode material, PEDOT:PSS as the second hole transport layer, 9,9-dioctyl polyfluorene-benzothiadiazole alternating copolymer (PFBT, Formula 1) as the light-emitting material of the polymer light-emitting layer, 8-hydroxyquinoline aluminum (Alq3) and LiF as the second electron transport layer, and ITO film as the common transparent negative electrode material; the transparent solar cell unit uses: a mixture of CsCO3 and TiO2 as the first electron transport layer, Poly{4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophene-4,6-diyl}(PTB7, Formula 2) as the donor material of the polymer light-absorbing layer, and PC as the acceptor material. 70 BM, the second hole transport layer uses PEDOT:PSS, the first insulating layer uses polydimethylsiloxane (PDMS), the x direction is used as the first direction, and the y direction is used as the second direction. The molecular structures of PFBT and PTB7 are as follows:

[0046]

[0047] The method for preparing the display screen structure with integrated solar cells in this embodiment includes the following steps:

[0048] Step S1, using a glass or plastic film substrate as the second insulating layer, and depositing an Au layer with a thickness of 50 to 100 nm on the surface of the glass or plastic film substrate by vacuum thermal evaporation coating method as the second positive electrode layer. Before the evaporation process, the glass or plastic film substrate needs to be ultrasonically cleaned in deionized water, acetone, and ethanol respectively;

[0049] Step S2, coating a PEDOT:PSS aqueous solution on the surface of the second positive electrode layer, and annealing to obtain a second hole transport layer, specifically, coating a PEDOT:PSS aqueous solution on the surface of the Au layer by slit coating or spin coating technology, heating to 110° C. and annealing for 10 to 15 minutes, wherein the volume ratio of the PEDOT:PSS stock solution to deionized water is 1:4;

[0050] Step S3, preparing a conjugated polymer light-emitting film oriented along the second direction on the surface of the second hole transport layer by molecular orientation treatment, as the polymer light-emitting layer of the display unit, specifically, coating a xylene solution containing PFBT on PEDOT:PSS by slit coating or inkjet printing technology, wherein the concentration of PFBT is 5-20 mg / ml, then placing the film coated with PFBT in a nitrogen-filled environment and placing it on a heating platform at 200-220° C., heating for 5-10 minutes to form a PFBT film, gently rubbing the surface of the film along the selected x direction with a clean velvet cloth for 20-200 times, and then quickly cooling the film to room temperature; then gently blowing clean the surface of the oriented PFBT film with nitrogen;

[0051] Step S4, sequentially depositing an Alq3 layer and a LiF layer on the surface of the polymer light-emitting layer by vacuum thermal evaporation coating method as a second electron transport layer, wherein the thickness of the Alq3 layer is 10 to 50 nm, and the thickness of the LiF layer is 2 to 10 nm;

[0052] Step S5, depositing an ITO layer on the surface of the second electron transport layer by magnetron sputtering as a common negative electrode layer, wherein the thickness of the ITO layer is 100 to 250 nm;

[0053] Step S6, coating a CsCO3:TiO2 mixed solution on the surface of the common negative electrode layer, and annealing to obtain a first electron transport layer, specifically, coating a CsCO3:TiO2 mixed solution on the surface of the ITO layer by slit coating or inkjet printing technology, heating to 150° C. and annealing for 15 minutes, wherein the CsCO3:TiO2 mixed solution is mainly prepared by 0.2-0.8wt% CSCO3 solution and 0.2-0.8wt% TiO2 solution in a volume ratio of 1:1;

[0054] Step S7, preparing a polymer light-absorbing layer oriented along a first direction on the surface of the first electron transport layer by molecular orientation treatment, wherein the angle between the first direction and the second direction is 90°, specifically, PTB7 and PC 70 BM was mixed and dissolved in chlorobenzene in a mass ratio of 2:3, and the total concentration of the mixed solution was 25 mg / ml. After the mixed solution was stirred for more than 12 hours, it was coated on the CsCO3:TiO2 layer by slit coating or inkjet printing technology, and then placed in a nitrogen environment, heated to 130-150°C for annealing for 10-15 minutes, and maintained at this temperature. A clean velvet cloth was used to gently rub the surface along the selected y direction for 20-200 times, where the angle between the y direction and the x direction was 90°, and then the temperature was quickly cooled to room temperature, and then the PTB7:PC after orientation was arranged. 70 The surface of the BM bulk heterojunction layer was cleaned with nitrogen;

[0055] Step S8, coating the surface of the polymer light absorbing layer with an isopropanol solution of PEDOT:PSS, and annealing the surface to obtain a first hole transport layer. Specifically, a slit coating or spin coating technique is used to coat the surface of the PTB7:PC 70 The surface of the BM bulk heterojunction layer is coated with an isopropanol solution of PEDOT:PSS, and heated to 105°C for annealing for 10 to 15 minutes, wherein the volume ratio of the PEDOT:PSS stock solution to isopropanol is 1:2;

[0056] Step S9, depositing an ITO layer on the first hole transport layer by magnetron sputtering as a first positive electrode layer, wherein the thickness of the ITO layer is 100-250 nm;

[0057] Step S10: Covering the first insulating layer on the surface of the first positive electrode layer by using glue dispensing.

[0058] The molecular orientation processing method of this embodiment adopts the surface friction method, but is not limited to this. One or more methods of mechanical stretching method, friction transfer method, Langmuir-Blodgett deposition technology, liquid crystal polymer self-assembly method and ultraviolet light induced orientation method can also be used to promote the orderly arrangement of polymer material molecules along the selected direction, which will not be described one by one here.

[0059] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A display screen structure with integrated solar cell function, characterized in that: It comprises a transparent solar cell unit for absorbing polarized light in a first direction and a display unit for emitting polarized light in a second direction, wherein the transparent solar cell unit is arranged above the display unit, and the first direction and the second direction are perpendicular to each other; The transparent solar cell unit is provided with a first insulating layer, a first positive electrode layer, a first hole transport layer, a polymer light absorbing layer, a first electron transport layer and a common negative electrode layer in order from top to bottom, the common negative electrode layer is directly grown on the display unit, and the polymer molecules of the polymer light absorbing layer are oriented and arranged along a first direction; The display unit is provided with a common negative electrode layer, a second electron transport layer, a polymer light-emitting layer, a second hole transport layer, a second positive electrode layer and a second insulating layer in order from top to bottom, the transparent solar cell unit is directly grown on the common negative electrode layer, the polymer molecules of the polymer light-emitting layer are oriented along the second direction, and the second insulating layer is a glass or plastic film substrate; The method for preparing the display screen structure with integrated solar cell function comprises the following steps: S1, a glass or plastic film substrate is used as the second insulating layer, and an Au layer is evaporated on the surface of the glass or plastic film substrate by vacuum thermal evaporation coating method as the second positive electrode layer; S2, coating a PEDOT:PSS aqueous solution on the surface of the second positive electrode layer, and annealing it to obtain a second hole transport layer; S3, coating a xylene solution containing a conjugated polymer light-emitting material on the surface of the second hole transport layer to form a conjugated polymer light-emitting film; rubbing the surface of the conjugated polymer light-emitting film along the selected second direction with a velvet cloth for 20 to 200 times, and then cooling the conjugated polymer light-emitting film to room temperature to obtain a polymer light-emitting layer oriented along the second direction; then, blowing the surface of the polymer light-emitting layer clean with nitrogen gas to serve as the polymer light-emitting layer of the display unit; S4, sequentially depositing an Alq3 layer and a LiF layer on the surface of the polymer light-emitting layer by a vacuum thermal evaporation coating method as a second electron transport layer; S5, depositing an ITO layer on the surface of the second electron transport layer by magnetron sputtering as a common negative electrode layer; S6, coating a CsCO3:TiO2 mixed solution on the surface of the common negative electrode layer, and performing an annealing treatment to obtain a first electron transport layer; S7, coating chlorobenzene mixed with donor material and acceptor material on the surface of the first electron transport layer to form a bulk heterojunction film; rubbing the surface of the bulk heterojunction film along the selected first direction with a velvet cloth for 20 to 200 times, cooling the bulk heterojunction film to room temperature to obtain a polymer light-absorbing layer oriented along the first direction, wherein the angle between the first direction and the second direction is 90°, and blowing the surface of the polymer light-emitting layer clean with nitrogen gas to serve as the polymer light-absorbing layer of the transparent solar cell unit; S8, coating the surface of the polymer light absorbing layer with an isopropanol solution of PEDOT:PSS, and performing annealing treatment to obtain a first hole transport layer; S9, depositing an ITO layer on the first hole transport layer by a magnetron sputtering method as a first positive electrode layer; S10, covering the first insulating layer on the surface of the first positive electrode layer by using a dispensing process.

2. The display screen structure with integrated solar cell function according to claim 1, characterized in that: The polymer light-absorbing layer is a bulk heterojunction structure composed of a mixture of an electron donor material and an acceptor material, wherein the donor material is polythiophene, poly(p-phenylene vinylene), polybenzodithiophene, polybenzothiadiazole, polypyrrole, a copolymer of porphyrin and thiophene, and one or more combinations of their diffractions, and the acceptor material is C 60 and its diffractor PC 60 BM, PC 70 The first insulating layer is a glass or transparent insulating polymer film covering layer.

3. The display screen structure with integrated solar cell function according to claim 2, characterized in that: The polymer light-emitting layer is prepared from a conjugated polymer light-emitting material, and the conjugated polymer light-emitting material is a combination of one or more of polyfluorene, polythiophene, polyparaphenylene vinylene, polyphenylene, polyaniline and derivatives thereof.

4. The display screen structure with integrated solar cell function according to claim 3, characterized in that: The volume ratio of PEDOT:PSS stock solution to deionized water in the PEDOT:PSS aqueous solution was 1:4; The conjugated polymer luminescent material is 9,9-dioctyl polyfluorene-benzothiadiazole alternating copolymer, and the concentration of the mixed solution is 5-20 mg / ml; CsCO3:TiO2 mixed solution consists of 0.2~0.8wt% C S The CO3 solution and 0.2~0.8wt% TiO2 solution are prepared in a volume ratio of 1:1; The donor material is PFBT and the acceptor material is PC 70 BM, PFBT and PC 70 BM was mixed in chlorobenzene at a mass ratio of 2:3, and the concentration of the mixed solution was 25 mg / ml; The volume ratio of PEDOT:PSS stock solution to isopropanol in the PEDOT:PSS isopropanol solution is 1:

2.

5. A display device with a display screen structure integrated with a solar cell function according to any one of claims 1 to 4, comprising a power management module and a secondary battery, characterized in that: The display screen structure includes a transparent solar cell unit for absorbing polarized light in a first direction and a display unit for emitting polarized light in a second direction. The transparent solar cell unit is arranged above the display unit, and the first direction and the second direction are perpendicular to each other. The transparent solar cell unit is provided with a first positive electrode layer, the display unit is provided with a second positive electrode layer, and a common negative electrode layer is provided between the transparent solar cell unit and the display unit. Wires are respectively led out from the first positive electrode layer, the second positive electrode layer and the common negative electrode layer and connected to a power management module, and the power management module is electrically connected to a secondary battery.

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