A display module integrated with thin-film solar cells and a preparation method thereof

Abstract

The present invention discloses a display module integrated with thin-film solar cells and a preparation method thereof. The display module includes a glass substrate. One side of the glass substrate facing the light-emitting direction of the display module has a color resin display area and a black matrix area. The black matrix area includes a thin-film solar cell layer disposed on the glass substrate and a light-shielding layer disposed on the thin-film solar cell layer. A thin-film solar cell trace is provided in the color resin display area. The front electrodes and back electrodes of the thin-film solar cell layer and the thin-film solar cell trace are both transparent electrodes. Implementing the present invention, the production process can be made simpler and the production cost can be reduced by the method of integrally manufacturing the light-shielding layer and the thin-film solar cell layer, the thickness of the display screen can be reduced, and the display effect is ensured by using transparent traces.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and more particularly to a display module integrated with thin-film solar cells and a preparation method thereof. Background Art

[0002] With the increasingly widespread use of electronic products such as computers, displays, and wearable devices, a common problem with these electronic products is that the display screen consumes most of the energy during the display process, resulting in the battery being unable to work for a long time. Therefore, applying thin-film solar cells to the display screen can effectively increase the battery usage time of the display screen. Thin-film solar cells have the advantages of thin thickness, low cost, and high photoelectric conversion rate. In the prior art, thin-film solar cells are arranged on the outermost protective cover plate of the display screen, or the thin-film solar cells and the display screen are separately manufactured and then pasted and fixed. These existing technologies do not have sufficient advantages in terms of manufacturing process, manufacturing cost, ensuring the display effect, and reducing the thickness of the display screen. It is still possible to further improve and simplify the manufacturing process, cost, ensure the display effect, and achieve the purpose of reducing the thickness of the display screen. Summary of the Invention

[0003] To solve the deficiencies of the above-mentioned prior art, the present invention provides a display module integrated with thin-film solar cells and a preparation method thereof, which has a simpler manufacturing process, lower manufacturing cost, reduced thickness of the display screen, and uses transparent traces to ensure the display effect.

[0004] The technical effects to be achieved by the present invention are realized through the following solutions: A display module integrated with thin-film solar cells includes a glass substrate. One side of the glass substrate facing the light-emitting direction of the display module has a color resin display area and a black matrix area. The black matrix area includes a thin-film solar cell layer provided on the glass substrate and a light-shielding layer provided on the thin-film solar cell layer. Thin-film solar cell traces are provided in the color resin display area, and the front electrodes and back electrodes of the thin-film solar cell layer and the thin-film solar cell traces are both transparent electrodes.

[0005] Preferably, the thin-film solar cell layer includes a first front electrode layer, a first photovoltaic absorption layer, and a first back electrode layer sequentially stacked on the glass substrate, and the light-shielding layer is provided on the first back electrode layer; the thin-film solar cell traces include a second front electrode layer, a second photovoltaic absorption layer, and a second back electrode layer sequentially stacked on the glass substrate, and no light-shielding layer is provided on the thin-film solar cell traces.

[0006] Preferably, in the color resin display area, the thin-film solar cell traces can be selectively disconnected.

[0007] Preferably, a first metal auxiliary layer is further provided at the outermost periphery of the black matrix region to reduce the resistance of the first front electrode layer and / or the first back electrode layer.

[0008] Preferably, a second metal auxiliary layer is further provided at the cross position in the middle region of the black matrix region to reduce the resistance of the first front electrode layer and / or the first back electrode layer in this region.

[0009] Preferably, the first photovoltaic absorption layer is provided at some positions in the black matrix region, and not provided at some positions. For the black matrix region where the first photovoltaic absorption layer is not provided, a first metal layer is provided to connect with the first front electrode layer, and the first metal layer is insulated from the first back electrode layer.

[0010] Preferably, a common electrode layer is further included. The common electrode layer is formed on the outer side surfaces of the color resin display region and the black matrix region. A second metal layer that is not connected to the first front electrode layer and the second front electrode layer is further provided on the thin film solar cell layer and the thin film solar cell trace. A through hole is further opened on the light shielding layer to connect the common electrode layer with the second metal layer.

[0011] A method for manufacturing a display module integrated with a thin film solar cell as described above, characterized by comprising the following steps:

[0012] Step S1: Form a first front electrode layer and a second front electrode layer on a glass substrate;

[0013] Step S2: Perform chemical vapor deposition to form a first photovoltaic absorption layer on the first front electrode layer, and perform chemical vapor deposition to form a second photovoltaic absorption layer on the second front electrode layer;

[0014] Step S3: Form a first back electrode layer on the first photovoltaic absorption layer and form a second back electrode layer on the second photovoltaic absorption layer; both the first back electrode layer and the second back electrode layer adopt transparent electrodes;

[0015] Step S4: After cleaning, first perform imaging etching on the first back electrode layer and the second back electrode layer, then perform imaging etching on the first photovoltaic absorption layer and the second photovoltaic absorption layer, and finally perform imaging etching on the first front electrode layer and the second front electrode layer;

[0016] Step S5: Prepare a light shielding layer in the black matrix region by means of spin coating, exposure and development;

[0017] Step S6: Prepare RGB sub-pixels in sequence by means of spin coating, exposure and development to form a color resin display region, and then deposit a common electrode layer on the leveling layer on the outer sides of the color resin display region and the black matrix region by physical vapor deposition.

[0018] Preferably, it further includes fabricating a second metal auxiliary layer at the crossing position in the middle area of the black matrix region. At the crossing position in the middle area of the black matrix region, a first back electrode layer is wet-etched at one time and a first photovoltaic absorption layer is dry-etched through a pre-set mask plate. The first front electrode layer is not etched, and then the first front electrode layer is led out by forming the second metal auxiliary layer.

[0019] Preferably, it further includes fabricating a second metal layer on the first back electrode layer and the second back electrode layer. An insulating layer is also fabricated between the second metal layer and the first back electrode layer and the second back electrode layer. The light-shielding layer forms a through hole through exposure, and after a common electrode layer is coated on the outer sides of the color resin display region and the black matrix region, the common electrode is directly connected to the second metal layer through the through hole.

[0020] The present invention has the following advantages:

[0021] 1. By arranging a thin-film solar cell layer in the black matrix region and thin-film solar cell traces in the color resin display region, the photoelectric conversion energy of the thin-film solar cell can be improved, meeting the use of the display module, effectively increasing its standby or usage time. At the same time, the method of fabricating the light-shielding layer and the thin-film solar cell layer integrally can make the manufacturing process simpler, the manufacturing cost lower, reduce the thickness of the display screen, and adopt transparent traces to ensure the display effect;

[0022] 2. By selectively disconnecting the thin-film solar cell traces, since the color of the second photovoltaic absorption layer itself is dark red, selectively disconnecting the thin-film solar cell traces can reduce the influence on the color resin display region;

[0023] 3. A first metal auxiliary layer is also provided at the outermost periphery of the black matrix region to reduce the resistance of the first front electrode layer and the first back electrode layer, improve the conversion efficiency of the thin-film solar cell layer under strong light, and at the same time facilitate the leading-out of the first front electrode layer and the first back electrode layer;

[0024] 4. A second metal auxiliary layer is also provided at the crossing position in the middle area of the black matrix region to reduce the resistance of the first front electrode layer and the first back electrode layer in this area;

[0025] 5. By arranging a first photovoltaic absorption layer at some positions in the black matrix region and not arranging a first photovoltaic absorption layer at some positions, a first metal layer is provided in the black matrix region where the first photovoltaic absorption layer is not arranged and is connected to the first front electrode layer to further reduce the resistance of the first front electrode layer;

[0026] 6. By arranging a second metal layer on the thin-film solar cell layer and the thin-film solar cell traces that is not connected to the first front electrode layer and the second front electrode layer, and a through hole is also opened on the light-shielding layer to connect the common electrode layer to the second metal layer to reduce the resistance of the common electrode layer. Brief Description of the Drawings

[0027] Figure 1 It is a schematic plan view showing the color resin display area, black matrix area and the plane structure of the battery of the display module of the integrated thin-film solar cell of the present invention;

[0028] Figure 2 It is a schematic side view showing the color resin display area and black matrix area of the display module of the integrated thin-film solar cell of the present invention;

[0029] Figure 3 It is a schematic side view showing the thin-film solar cell layer and the light-shielding layer in the black matrix area of the display module of the integrated thin-film solar cell of the present invention;

[0030] Figure 4 It is a schematic side view showing the thin-film solar cell wiring in the color resin display area of the display module of the integrated thin-film solar cell of the present invention;

[0031] Figure 5 It is a schematic side view showing that the outermost periphery in the black matrix area of the display module of the integrated thin-film solar cell of the present invention is provided with a first metal auxiliary layer;

[0032] Figure 6 It is a schematic plan view showing that the middle area at the intersection in the black matrix area of the display module of the integrated thin-film solar cell of the present invention is hollowed out;

[0033] Figure 7 It is Figure 6 the schematic side view at A-A in

[0034] Figure 8 It is a schematic side view showing that the first photovoltaic absorption layer is not provided and the first metal layer is provided in the black matrix area of the display module of the integrated thin-film solar cell of the present invention;

[0035] Figure 9 It is a schematic side view showing the connection between the common electrode layer and the second metal layer in the display module of the integrated thin-film solar cell of the present invention;

[0036] Figure 10 It is a process flow chart of the preparation method of the display module of the integrated thin-film solar cell of the present invention. Detailed Embodiments

[0037] The present invention will be described in detail below with reference to the drawings and embodiments. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0039] In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0040] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", "arranged", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may also be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Embodiment 1

[0042] Combined with Figures 1 - 2 As shown, an embodiment of the present invention provides a display module integrated with thin-film solar cells, including a glass substrate 10. One side of the glass substrate 10 facing the light-emitting direction of the display module has a color resin display area 100 and a black matrix area 200. The black matrix area 200 includes a thin-film solar cell layer 210 disposed on the glass substrate 10 and a light-shielding layer 220 disposed on the thin-film solar cell layer 210. A thin-film solar cell trace 110 is provided in the color resin display area 100, wherein the front electrodes and back electrodes of the thin-film solar cell layer 210 and the thin-film solar cell trace 110 are both transparent electrodes.

[0043] Specifically, combined with Figures 3 - 4The thin-film solar cell layer 210 includes a first front electrode layer 211, a first photovoltaic absorption layer 212, and a first back electrode layer 213 that are sequentially stacked on the glass substrate 10. The light-shielding layer 220 is disposed on the first back electrode layer 213. The thin-film solar cell trace 110 includes a second front electrode layer 111, a second photovoltaic absorption layer 112, and a second back electrode layer 113 that are sequentially stacked on the glass substrate 10. The light-shielding layer 220 is not provided on the thin-film solar cell trace 110, and the second back electrode layer 113 is made of a transparent material so that the thin-film solar cell trace 110 is invisible to the naked eye within the color resin display area 100, effectively reducing the impact on the display effect of the color resin display area 100. The width of the thin-film solar cell trace 110 is preferably less than 60 nm and is invisible to the naked eye. Moreover, the angle of the thin-film solar cell trace 110 should not generate moiré patterns with the color resin display. Meanwhile, the number of the thin-film solar cell traces 110 distributed in the color resin display area 100 can be determined according to the requirement of the display effect. When the requirement for the display effect is high, the number of the thin-film solar cell traces 110 can be appropriately reduced. On the contrary, when the requirement for the display effect is not high, the number of the thin-film solar cell traces 110 can be appropriately increased. It should be understood that when the display module does not have the black matrix area 200, the display module can entirely adopt the thin-film solar cell trace 110 to form a semi-transparent solar cell for powering the display module.

[0044] By providing the thin-film solar cell layer 210 in the black matrix area 200 and the thin-film solar cell trace 110 in the color resin display area 100, the present invention can improve the photoelectric conversion energy of the thin-film solar cell, meet the use of the display module, and effectively increase its standby or usage time. Meanwhile, by integrally manufacturing the light-shielding layer 220 and the thin-film solar cell layer 210, the manufacturing process can be made simpler, the manufacturing cost can be lower, the thickness of the display screen can be reduced, and the display effect can be ensured by using transparent traces.

[0045] As shown in the figure, in the present invention, the thin-film solar cell layer 210 and the light-shielding layer 220 in the black matrix area 200 are equivalent to the light-leakage shielding areas of the color film substrate, which can effectively prevent the decrease in the contrast of the display screen caused by seeing light leakage. External natural light enters the display module, and the light passes through the first front electrode layer 211 and the second front electrode layer 111 and irradiates on the first photovoltaic absorption layer 212 and the second photovoltaic absorption layer 112 to generate photoelectric conversion.

[0046] As a further improvement of the embodiment of the present invention, in the color resin display area 100, the thin film solar cell wiring 110 can be selectively disconnected according to the brightness requirement of the display screen. Since the color of the second photovoltaic absorption layer 112 itself is dark red, selectively disconnecting the thin film solar cell wiring 110 can reduce the influence on the color resin display area 100. It should be understood that each thin film solar cell wiring 110 should be connected to the thin film solar cell layer 210 to form an effective battery function. The thin film solar cell wiring 110 and the thin film solar cell layer 210 can be a single-junction thin film solar cell structure or a multi-junction thin film solar cell structure, and the present invention does not make specific limitations.

[0047] In the embodiment of the present invention, the side of the first front electrode layer 211 facing the first light absorption layer can also be textured by chemical texturing or methods such as MOCVD to improve the light absorption of the first light absorption layer, and the side of the second front electrode layer 111 facing the second light absorption layer can also be textured by chemical texturing or methods such as MOCVD to improve the light absorption of the second light absorption layer. The light-shielding layer 220 is made of materials such as black resin and is generally similar to the black matrix material used on a conventional color film substrate. The light-shielding layer 220 can also be made of materials such as black metal, which can prevent the light generated by the backlight from being reflected back to the array substrate, causing the thin film transistor to absorb light and affecting the display effect.

[0048] Combined with Figure 5 As shown, as a further improvement of the embodiment of the present invention, a first metal auxiliary layer 214 is further provided at the outermost periphery of the black matrix area 200 to reduce the resistance of the first front electrode layer 211 and / or the first back electrode layer 213, improve the conversion efficiency of the thin film solar cell layer 210 under strong light, and at the same time facilitate the extraction of the first front electrode layer 211 and the first back electrode layer 213. The width of the edge of the black matrix area 200 can be greater than the width of the middle position of the black matrix area 200 to improve the conversion efficiency of the thin film solar cell layer 210. It should be understood that the metal auxiliary layer of the first front electrode layer 211 and the metal auxiliary layer of the first back electrode layer 213 should be insulated from each other by an insulating layer 20 to avoid short circuit. The first metal auxiliary layer 214 can be used as the total positive and negative gate buses to extract the positive and negative electrodes of the solar cell respectively.

[0049] Combined with Figures 6 - 7As shown in the figure, as a further improvement of the embodiment of the present invention, for a large-area display module, the black matrix region 200 in the middle region has a relatively large resistance. Therefore, a second metal auxiliary layer 215 is further provided at the cross position in the middle region of the black matrix region 200 to reduce the resistance of the first front electrode layer 211 and / or the first back electrode layer 213 in this region. The second metal auxiliary layer 215 can be led out to be connected to the gate bus. Specifically, when implemented, the first light absorption layer and the first back electrode layer 213 can be locally hollowed out at the cross position so that the second metal auxiliary layer 215 is connected to the first front electrode layer 211, and / or the second metal auxiliary layer 215 is connected to the first back electrode layer 213. The second metal auxiliary layer 215 connected to the first front electrode layer 211 and the second metal auxiliary layer 215 connected to the first back electrode layer 213 are insulated from each other.

[0050] Combined with Figure 8 As shown in the figure, as a further improvement of the embodiment of the present invention, when the area of the display module is large enough, the resistance of the thin-film solar cell layer 210 has a great influence on the efficiency under strong light. In order to reduce the resistance of the thin-film solar cell layer 210, the first photovoltaic absorption layer 212 is provided at some positions of the black matrix region 200, and the first photovoltaic absorption layer 212 is not provided at some positions. The black matrix region 200 where the first photovoltaic absorption layer 212 is not provided is provided with a first metal layer 216 connected to the first front electrode layer 211 to further reduce the resistance of the first front electrode layer 211. The first metal layer 216 is insulated from the first back electrode layer 213 and can extend above the first photovoltaic absorption layer 212. Preferably, the position where the first photovoltaic absorption layer 212 is not provided is the narrower position of the black matrix region 200. The first photovoltaic absorption layer 212 can be not provided every 500 μm distance, and the actual distance is selected according to the actual ambient light intensity used, increasing or decreasing.

[0051] In the embodiment of the present invention, the insulating layer 20 can be prepared from an organic substance or an inorganic substance such as SiNx.

[0052] Combined with Figure 9 As shown in the figure, the display module further includes a common electrode layer 300. The common electrode layer 300 is formed on the outer side surfaces of the color resin display region 100 and the black matrix region 200. A second metal layer 217 that is not connected to the first front electrode layer 211 and the second front electrode layer 111 is further provided on the thin-film solar cell layer 210 and the thin-film solar cell trace 110. A through hole is further opened on the light-shielding layer 220 to connect the common electrode layer 300 to the second metal layer 217, for reducing the resistance of the common electrode layer 300. Preferably, the diameter of the through hole is 3 μm - 15 μm, and the performance is the best. The material of the common electrode layer 300 can be ITO or AZO. It should be understood that the display module of the embodiment of the present invention may not be provided with the common electrode layer 300.

[0053] In the embodiments of the present invention, the materials of the first front electrode layer 211, the first back electrode layer 213, the second front electrode layer 111, and the second back electrode layer 113 may all be AZO, which has a high transmittance.

[0054] Embodiment Two

[0055] As Figure 10 shown, the embodiments of the present invention provide a method for preparing a display module of an integrated thin-film solar cell as described in Embodiment One, including the following steps:

[0056] Step S1: Form the first front electrode layer 211 and the second front electrode layer 111 on the glass substrate 10; the film-forming temperature is 170°C - 350°C, and the film-forming thickness is between 50 nm and 1000 nm; on the surface of the first front electrode layer 211 and the second front electrode layer 111 away from the glass substrate 10, low-concentration HCl or alkaline substances can be selected for texturing to form an uneven plane, so as to improve the absorption of solar reflected light. The first front electrode layer 211 and the second front electrode layer 111 both adopt transparent electrodes to improve the transmittance and reduce the impact on the display effect. It should be understood that the first front electrode layer 211 and the second front electrode layer 111 can be formed simultaneously, and the process is simpler.

[0057] Step S2: Chemically vapor deposit the first photovoltaic absorption layer 212 on the first front electrode layer 211, and chemically vapor deposit the second photovoltaic absorption layer 112 on the second front electrode layer 111. Similarly, the first photovoltaic absorption layer 212 and the second photovoltaic absorption layer 112 are also formed simultaneously.

[0058] Specifically, both the first photovoltaic absorption layer 212 and the second photovoltaic absorption layer 112 are divided into a P layer, an I layer, and an N layer. Among them, the thickness of the P layer is 10 nm - 90 nm, the film-forming temperature is 150°C - 280°C, the I layer is 200 nm - 700 nm, the film-forming temperature is 150°C - 280°C, and the N layer is 20 nm - 80 nm, and the film-forming temperature is 150°C - 230°C.

[0059] Step S3: Form the first back electrode layer 213 on the first photovoltaic absorption layer 212 and form the second back electrode layer 113 on the second photovoltaic absorption layer 112; the first back electrode layer 213 and the second back electrode layer 113 both adopt transparent electrodes, which play the role of double-sided light absorption, improve the transmittance and reduce the impact on the display effect. Similarly, the first back electrode layer 213 and the second back electrode layer 113 are also formed simultaneously.

[0060] Step S4: After cleaning, first perform imaging etching on the first back electrode layer 213 and the second back electrode layer 113, then perform imaging etching on the first photovoltaic absorption layer 212 and the second photovoltaic absorption layer 112, and finally perform imaging etching on the first front electrode layer 211 and the second front electrode layer 111;

[0061] For the first back electrode layer 213, the second back electrode layer 113, the first front electrode layer 211, and the second front electrode layer 111, chemical etching can be performed after coating, exposure, and imaging; for the first photovoltaic absorption layer 212 and the second photovoltaic absorption layer 112, dry etching can be used. Here, mainly dry etching is directly performed without photoresist stripping before dry etching, thus saving process steps.

[0062] Step S5: Prepare the light-shielding layer 220 in the black matrix area 200 by coating, exposure, and development. Cover the first back electrode layer 213 with black resin by coating and exposure. The black resin serves as a light shield. The light-shielding layer 220 controls the line width through exposure to make the light-shielding layer 220 larger than the thin-film solar cell layer 210 to avoid light leakage.

[0063] Step S6: Prepare RGB sub-pixels in sequence by coating, exposure, and development to form the color resin display area 100. Then deposit the common electrode layer 300 on the leveling layer outside the color resin display area 100 and the black matrix area 200 by physical vapor deposition.

[0064] As a further improvement of Embodiment 2 of the present invention, it also includes the production of partial disconnection of the wiring in the color resin display area 100. The disconnection is not formed with photoresist using a mask. First, the second back electrode is etched away by chemical wet etching, then the second light absorption layer is etched away by dry etching, and then the second front electrode is etched away by chemical wet etching. Since the color of the second photovoltaic absorption layer 112 itself is dark red, selectively disconnecting the thin-film solar cell wiring 110 can reduce the impact on the color resin display area 100.

[0065] As a further improvement of Embodiment 2 of the present invention, it also includes the production of the first metal auxiliary layer 214 at the outermost periphery of the black matrix area 200. The first metal auxiliary layer 214 is formed by a single deposition through physical vapor deposition. This step also includes the production of the insulating layer 20, which insulates and separates the first metal auxiliary layer 214 in contact with the first front electrode layer 211 and the first metal auxiliary layer 214 in contact with the first back electrode layer 213. The first metal auxiliary layer 214 can reduce the resistance of the first front electrode layer 211 and the first back electrode layer 213, improve the conversion efficiency of the thin-film solar cell layer 210 under strong light, and is also conducive to the lead-out of the first front electrode layer 211 and the first back electrode layer 213.

[0066] When the insulating layer 20 is made of an organic material, it can be prepared by methods such as spin coating, exposure, development, pad printing or screen printing, and the process is simpler. When the insulating layer 20 is protected by non-metals such as SiNx or SiO2, a film can be formed by methods such as chemical vapor deposition (CVD) or magnetron sputtering, and then a pattern is made by exposure with yellow light and then dry etched into a pattern.

[0067] As a further improvement of the second embodiment of the present invention, it also includes fabricating a second metal auxiliary layer 215 at the intersection position in the middle area of the black matrix area 200. At the intersection position in the middle area of the black matrix area 200, a mask plate is pre-set, and the first back electrode and the first photovoltaic absorption layer 212 are wet etched and dry etched at one time, and the first front electrode is not etched. Then, the first front electrode layer 211 is led out by forming the second metal auxiliary layer 215 to reduce the resistance. The second metal auxiliary layer 215 is used to reduce the resistance of the second front electrode layer 111 in this area.

[0068] As a further improvement of the second embodiment of the present invention, it also includes removing the fabrication of the first photovoltaic absorption layer 212 in the black matrix area 200. After etching away the first back electrode, the exposed first photovoltaic absorption layer 212 is etched by dry etching, and the first metal layer 216 is connected to the first front electrode by coating. When the area of the display module is large enough, the resistance of the thin-film solar cell layer 210 has a great influence on the efficiency under strong light. Removing the fabrication of the first photovoltaic absorption layer 212 can reduce the resistance of the thin-film solar cell layer 210.

[0069] As a further improvement of the second embodiment of the present invention, it also includes fabricating a second metal layer 217 on the first back electrode layer 213 and the second back electrode layer 113. An insulating layer 20 is also fabricated between the second metal layer 217 and the first back electrode layer 213 and the second back electrode layer 113. The second metal layer 217 and the first metal auxiliary layer 214 can be formed simultaneously. The light-shielding layer 220 forms a through hole by exposure, and after coating the common electrode layer 300 on the outside of the color resin display area 100 and the black matrix area 200, the common electrode is directly connected to the second metal layer 217 through the through hole. The fabrication of the second metal layer 217 is used to reduce the resistance of the common electrode layer 300.

[0070] The preparation method of a display module integrated with a thin-film solar cell provided by the second embodiment of the present invention makes the manufacturing process of the display module simpler, the manufacturing cost lower, improves the display effect and reduces the resistance of the battery.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention rather than to limit them. Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or equivalently replaced, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display module integrated with a thin-film solar cell, comprising a glass substrate, wherein one side of the glass substrate facing the light-emitting direction of the display module has a color resin display area and a black matrix area, and is characterized in that, The black matrix region includes a thin film solar cell layer disposed on a glass substrate and a light-shielding layer disposed on the thin film solar cell layer. A thin film solar cell trace is provided in the color resin display region, wherein the front electrodes and the back electrodes of the thin film solar cell layer and the thin film solar cell trace are both transparent electrodes; The thin film solar cell layer includes a first front electrode layer, a first photovoltaic absorption layer, and a first back electrode layer that are sequentially stacked on the glass substrate. The light-shielding layer is disposed on the first back electrode layer; a second metal auxiliary layer is further provided at the intersection position in the middle region of the black matrix region, and the second metal auxiliary layer is led out to be connected to the outermost gate bus; the black matrix region locally hollowes out the first photovoltaic absorption layer and the first back electrode layer at the intersection position so that the second metal auxiliary layer is connected to the first front electrode layer, and the second metal auxiliary layer is also connected to the first back electrode layer, and the second metal auxiliary layer connected to the first front electrode layer and the second metal auxiliary layer connected to the first back electrode layer are insulated from each other.

2. The display module of the integrated thin-film solar cell according to claim 1, wherein, The thin film solar cell trace includes a second front electrode layer, a second photovoltaic absorption layer, and a second back electrode layer that are sequentially stacked on the glass substrate, and no light-shielding layer is provided on the thin film solar cell trace.

3. The display module of the integrated thin-film solar cell according to claim 1 or 2, characterized in that, In the color resin display region, the thin film solar cell trace can be selectively disconnected.

4. The display module of the integrated thin-film solar cell according to claim 1, characterized in that A first metal auxiliary layer is further provided at the outermost periphery of the black matrix region to reduce the resistance of the first front electrode layer and / or the first back electrode layer.

5. The display module of the integrated thin-film solar cell according to claim 1 or 2, characterized in that The first photovoltaic absorption layer is provided at some positions in the black matrix region, and not provided at some positions. A first metal layer is provided at the black matrix region where the first photovoltaic absorption layer is not provided and is connected to the first front electrode layer, and the first metal layer is insulated from the first back electrode layer.

6. The display module of the integrated thin-film solar cell according to claim 1 or 2, characterized in that, It further includes a common electrode layer, the common electrode layer is formed on the outer side surfaces of the color resin display region and the black matrix region, a second metal layer that is not connected to the first front electrode layer and the second front electrode layer is further provided on the thin film solar cell layer and the thin film solar cell trace, and a through hole is further opened on the light-shielding layer to connect the common electrode layer and the second metal layer.

7. A method for preparing a display module of an integrated thin-film solar cell according to any one of claims 1-6, characterized in that, It includes the following steps: Step S1: Form the first front electrode layer and the second front electrode layer on the glass substrate; Step S2: Perform chemical vapor deposition to form the first photovoltaic absorption layer on the first front electrode layer, and perform chemical vapor deposition to form the second photovoltaic absorption layer on the second front electrode layer; Step S3: Form the first back electrode layer on the first photovoltaic absorption layer and form the second back electrode layer on the second photovoltaic absorption layer; both the first back electrode layer and the second back electrode layer adopt transparent electrodes; Step S4: After cleaning, first perform imaging etching on the first back electrode layer and the second back electrode layer, then perform imaging etching on the first photovoltaic absorption layer and the second photovoltaic absorption layer, and finally perform imaging etching on the first front electrode layer and the second front electrode layer; Step S5: Prepare the light-shielding layer in the black matrix region by means of coating, exposure, and development; Step S6: Prepare RGB sub-pixels in sequence by means of coating, exposure, and development to form a color resin display area, and then deposit a common electrode layer on the leveling layer outside the color resin display area and the black matrix area by physical vapor deposition.

8. The manufacturing method of the display module of the integrated thin-film solar cell according to claim 7, characterized in that, It also includes fabricating a second metal auxiliary layer at the intersection position in the middle area of the black matrix area. At the intersection position in the middle area of the black matrix area, a mask plate is preset in advance, and the first back electrode layer is wet-etched and the first photovoltaic absorption layer is dry-etched at one time, and the first front electrode layer is not etched. Then, the first front electrode layer is led out by forming the second metal auxiliary layer.

9. The preparation method of the display module of the integrated thin-film solar cell according to claim 8, characterized in that, It also includes fabricating a second metal layer on the first back electrode layer and the second back electrode layer. An insulating layer is also fabricated between the second metal layer and the first back electrode layer and the second back electrode layer. The light-shielding layer forms a through hole through exposure. After the common electrode layer is deposited outside the color resin display area and the black matrix area, the common electrode is directly connected to the second metal layer through the through hole.

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