Self-powered display device

Abstract

To provide a self-powered display device.SOLUTION: A self-powered display device comprises: a substrate having a display region and a non-display region; a first photoelectric conversion unit disposed on the substrate and located in the display region; a light-transmitting display module stacked on the first photoelectric conversion unit; and a wireless charging module that is disposed on the substrate and located in the non-display region, receives second light and converts the second light into second electrical energy, and provides the second electrical energy to the light-transmitting display module; where the first light transmits the light-transmitting display module, the first photoelectric conversion unit converts the first light to first electrical energy and provides the light-transmitting display module with the first electrical energy, and a wavelength range of the first light is different from a wavelength range of the second light. Thereby, the self-powered display device can improve a power generation amount and has a wireless charging function.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to displays, and more particularly to self-powered displays. [Background technology]

[0002] One of the characteristics of transmissive reflective displays (e.g., cholesteric liquid crystal displays (ChLCDs)) is that they not only reflect ambient light to provide a screen, but also transmit a portion of the ambient light to the bottom. By incorporating a solar panel at the bottom of the display, ambient light can be fully utilized to achieve self-power generation. With the advancement of display technology, display functions tend to become more diverse. Although cholesteric liquid crystal displays (LCDs) with bistable states are very energy-efficient, because the solar panel is attached below the display, they can only capture a portion of the light that passes through the display to generate power. This limits the display's multifunctional applications, such as when the screen needs to be updated frequently, when communication functions are required, or when the display is used in a space with insufficient ambient light. However, when trying to increase power generation by adding wireless charging functionality to the same solar panel, there is still a problem that the absorption bands of the solar cell that absorbs ambient light and the solar cell for wireless charging are different. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of this, how to develop a self-powered display device that has wireless charging function, and at the same time has a simple manufacturing process and low manufacturing cost is indeed a major problem that relevant industry players are currently trying to solve.

[0004] Therefore, an object of the present disclosure is to provide a self-powered display device that increases power generation by disposing a first photoelectric conversion unit and a wireless charging module on the substrate of a solar panel for absorbing a first light ray and a second light ray, respectively. Furthermore, in applications where wireless charging is not required, the retroreflector in the wireless charging module can be removed, and the second photoelectric conversion unit in the wireless charging module can still perform photoelectric conversion, thereby achieving the objective of increasing power generation. In summary, the present disclosure solves the problem in the prior art that solar panels can only capture a portion of the light rays that pass through the display to generate power, and the amount of power generation is insufficient to support the multi-functional use of the display. [Means for solving the problem]

[0005] According to one embodiment of the present disclosure, there is provided a self-powered display device comprising: a substrate having a display area and a non-display area; a first photoelectric conversion unit provided on the substrate and located in the display area; a translucent display module stacked on the first photoelectric conversion unit and configured to receive a first light ray; and a wireless charging module provided on the substrate and located in the non-display area for receiving a second light ray, converting the second light ray into second electric energy, and providing the second electric energy to the translucent display module, wherein the first light ray passes through the translucent display module and enters the first photoelectric conversion unit, and the first photoelectric conversion unit converts the first light ray into first electric energy and provides the first electric energy to the translucent display module, and the wavelength range of the first light ray is different from the wavelength range of the second light ray.

[0006] In another example of the embodiment, the self-powered display device further includes a storage module electrically connected to the first photoelectric conversion unit and the wireless charging module, for storing the first electric energy and the second electric energy, and for providing the first electric energy and the second electric energy to the translucent display module.

[0007] In another example of the embodiment, the display area is adjacent to the non-display area and has an area larger than that of the non-display area.

[0008] In another example of the embodiment, the wavelength range of the first light beam is 400 nm to 700 nm, and the wavelength range of the second light beam is 700 nm to 2500 nm.

[0009] In another example of the embodiment, the wireless charging module includes a second photoelectric conversion unit mounted on a substrate, and a retroreflector removably mounted on the substrate and covering the second photoelectric conversion unit, wherein a portion of the second light beam passes through the retroreflector and enters the second photoelectric conversion unit, and the second photoelectric conversion unit converts this portion of the second light beam into second electrical energy.

[0010] In another implementation of the embodiment, the second photoelectric conversion unit is different from the first photoelectric conversion unit.

[0011] According to another embodiment of the present disclosure, there is provided a wireless charging module for receiving a second light ray, the wireless charging module including: a substrate having a display area and a non-display area; a first photoelectric conversion unit provided on the substrate and located in the display area; a light-transmitting display module stacked on the first photoelectric conversion unit and configured to receive a first light ray; a second photoelectric conversion unit provided on the substrate and located in the non-display area; and a retroreflector detachably provided on the substrate and covering the second photoelectric conversion unit. A portion of the second light beam passes through the retroreflector to enter the second photoelectric conversion unit, which converts the first light beam into first electrical energy and provides the first electrical energy to the translucent display module; a portion of the second light beam passes through the retroreflector to enter the second photoelectric conversion unit, which converts the second light beam into second electrical energy and provides the second electrical energy to the translucent display module, thereby providing a self-powered display device in which the wavelength range of the first light beam is the same as the wavelength range of the second light beam.

[0012] In another example of the embodiment, the self-powered display device further includes a storage module electrically connected to the first photoelectric conversion unit and the second photoelectric conversion unit, for storing the first electric energy and the second electric energy, and for providing the first electric energy and the second electric energy to the translucent display module.

[0013] In another example of the embodiment, the display area is adjacent to the non-display area and has an area larger than that of the non-display area.

[0014] In another example of the embodiment, the wavelength range of the first light beam and the wavelength range of the second light beam are both 400 nm to 800 nm.

[0015] In another example of the embodiment, the first photoelectric conversion unit and the second photoelectric conversion unit are both organic solar cells or perovskite solar cells. [Brief explanation of the drawings]

[0016] [Figure 1A] 1 is a schematic three-dimensional view showing a self-powered display device according to a first example of a first embodiment of the present disclosure. [Figure 1B] FIG. 1B is a locally transparent top view of the self-powered display device of FIG. 1A. [Figure 1C] 1B is a cross-sectional view showing the self-powered display device of FIG. 1A. FIG. [Figure 2] 1 is a schematic diagram illustrating wireless charging using a wireless charging module according to the present disclosure. FIG. [Figure 3A] FIG. 2 is a locally transparent top view showing a self-powered display device according to a second example of the first embodiment of the present disclosure. [Figure 3B] 3B is a cross-sectional view showing the self-powered display device of FIG. 3A. FIG. [Figure 4] FIG. 10 is a locally transparent top view showing a self-powered display device according to a first example of a second embodiment of the present disclosure. [Figure 5]FIG. 1 is a diagram showing external quantum efficiency spectra when the first photoelectric conversion unit and the second photoelectric conversion unit of the present disclosure are organic solar cells. [Figure 6] FIG. 10 is a diagram showing the external quantum efficiency spectrum when the first photoelectric conversion unit and the second photoelectric conversion unit of the present disclosure are perovskite solar cells. [Figure 7] FIG. 10 is a locally transparent top view showing a self-powered display device according to a second example of a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, several embodiments of the present disclosure will be described with reference to the drawings. For clarity, many practical details are set forth in the following description. However, it should be understood that these practical details are not intended to limit the present disclosure. That is, in some embodiments of the present disclosure, these practical details are not necessary. Also, to simplify the drawings, some conventional structures and elements may be shown simply and diagrammatically in the drawings, and repeated elements may be designated by the same or similar reference numerals.

[0018] Furthermore, in this specification, when an element (or unit, module, etc.) is "connected / coupled" to another element, this may mean that the element is directly connected / coupled to the other element, or that the element is indirectly connected / coupled to the other element, i.e., there is another element between the element and the other element. Only when an element is "directly connected / coupled" to another element is it meant that there is no other element between the element and the other element. Terms such as "first," "second," and "third" are used merely to describe different elements and do not limit the elements themselves; therefore, a first element may be replaced with a second element. Furthermore, the combinations of elements / units / circuits in this specification are not ordinary or conventional combinations commonly known in this field, and whether the elements / units / circuits themselves are conventional or not should not be used to determine whether the combinations can be easily achieved by those skilled in the art.

[0019] Please refer to Figures 1A, 1B, and 1C together. Figure 1A is a schematic three-dimensional view showing a self-powered display device according to a first example of the first embodiment of the present disclosure. Figure 1B is a partially transparent top view showing the self-powered display device of Figure 1A. Figure 1C is a schematic cross-sectional view showing the self-powered display device of Figure 1A. As shown in Figures 1A to 1C, the self-powered display device 100 includes a substrate 110, a first photoelectric conversion unit 120, a translucent display module 130, and a wireless charging module 140.

[0020] The substrate 110 has a display area A1 and a non-display area A2. The display area A1 is adjacent to the non-display area A2 and has a larger area than the non-display area A2. The first photoelectric conversion unit 120 is mounted on the substrate 110 and is located within the display area A1. The translucent display module 130 is electrically connected above the first photoelectric conversion unit 120 and stacked thereon. The outer edge of the translucent display module 130 is aligned with the display area A1, i.e., the top area of ​​the translucent display module 130 is the same as the area of ​​the display area A1. The translucent display module 130 is used to receive a first light ray L1 from outside the self-powered display device 100, and the first light ray L1 passes through the translucent display module 130 and enters the first photoelectric conversion unit 120. The first photoelectric conversion unit 120 converts the first light beam L1 into first electric energy P1 and provides the first electric energy P1 to the translucent display module 130 via conductive lines (not shown) inside the first photoelectric conversion unit 120. The wireless charging module 140 is mounted on the substrate 110 and located in the non-display area A2. The projected area of ​​the wireless charging module 140 in the non-display area A2 is the same as the area of ​​the non-display area A2. The wireless charging module 140 receives the second light beam L2 and converts the second light beam L2 into second electric energy P2. The wireless charging module 140 provides the second electric energy P2 to the translucent display module 130 via conductive lines (not shown) inside the substrate 110. In some embodiments, the wireless charging module 140 may be directly connected to the translucent display module 130 and transmit the second electric energy P2 to the translucent display module 130.

[0021] The wavelength range of the first light ray L1 is different from the wavelength range of the second light ray L2. The first light ray L1 may be outdoor or indoor ambient light and have a wavelength range of 400 nm to 700 nm. The second light ray L2 may be infrared (IR) light and have a wavelength range of 700 nm to 2500 nm. The self-powered display device 100 of the present disclosure has a first photoelectric conversion unit 120 and a wireless charging module 140 disposed on the substrate 110, respectively, to absorb the first light ray L1 and the second light ray L2, which have different wavelength ranges, and generate a first electric energy P1 and a second electric energy P2, thereby achieving an effect of increasing power generation. Therefore, the self-powered display device 100 utilizes the wireless charging function to solve the problem in the prior art that solar panels can only capture a portion of the light transmitted through the display to generate power, which is insufficient to support the multi-functional use of the display.

[0022] In some embodiments, the substrate 110 may be a backplane having a certain rigidity and provided with a plurality of wirings for controlling signal transmission. The first photoelectric conversion unit 120 may be, but is not limited to, a silicon crystalline solar cell, a thin-film solar cell, an organic solar cell (OSC), a perovskite solar cell (PSC), or a dye-sensitized solar cell (DSSC), and may be other solar cells capable of converting a first light ray L1 having a wavelength range of 400 nm to 700 nm into a first electric energy P1.

[0023] The translucent display module 130 may be, but is not limited to, a cholesteric liquid crystal display (ChLCD), a semi-transmissive / semi-reflective liquid crystal display, a transparent organic light-emitting diode (OLED) display, or a transparent light-emitting diode (LED) display. It may also be any other display that has a screen display function and allows the first light beam L1 to pass through. In this embodiment, the translucent display module 130 is a cholesteric liquid crystal display, which has two stable states: a focal conic state and a planar state. By applying different voltages to the translucent display module 130, the alignment state of the cholesteric liquid crystal molecules can be controlled to switch between the focal conic state and the planar state. When the translucent display module 130 is in a planar alignment state, the cholesteric liquid crystal molecules are aligned in an orderly manner, and the first light ray L1 is reflected to display the screen. However, when the translucent display module 130 is in a focal conic alignment state, the cholesteric liquid crystal molecules are aligned in a disordered manner, and the first light ray L1 can be transmitted to the bottom of the translucent display module 130 and absorbed by the first photoelectric conversion unit 120.

[0024] Please refer to FIGS. 1A-1C and 2 together. FIG. 2 is a schematic diagram illustrating wireless charging using the wireless charging module of the present disclosure. As shown in FIGS. 1A-1C and 2, the wireless charging module 140 may be a light receiver for absorbing light radiation in wireless charging technology and may include a second photoelectric conversion unit 141 and a retroreflector 142. The second photoelectric conversion unit 141 may be, but is not limited to, a silicon crystalline solar cell, a thin-film solar cell, an organic solar cell, a perovskite solar cell, or a dye-sensitized solar cell, and may also be other solar cells capable of converting second light rays L2 having a wavelength range of 700 nm to 2500 nm into second electrical energy P2. The second photoelectric conversion unit 141 is different from the first photoelectric conversion unit 120; that is, the second photoelectric conversion unit 141 and the first photoelectric conversion unit 120 are different types of solar cells. The second photoelectric conversion unit 141 is provided on the substrate 110 and is located in the non-display area A2. The retroreflector 142 is removably provided on the substrate 110, aligned with the non-display area A2, and covers the second photoelectric conversion unit 141. A portion of the second light ray L2 passes through the retroreflector 142 and enters the second photoelectric conversion unit 141, allowing the second photoelectric conversion unit 141 to convert this portion of the second light ray L2 into second electrical energy P2.

[0025] 2, the second light beam L2 is generated by a light emitter 500 located outside the self-powered display device 100. The light emitter 500 includes a laser gain medium 510 and another retroreflector 520. One side of the laser gain medium 510 faces the wireless charging module 140, and the retroreflector 520 is provided adjacent to the other side of the laser gain medium 510. The laser gain medium 510 is made of a semiconductor material (e.g., aluminum gallium arsenide (GaAlAs)). When an electrical excitation input (e.g., an input voltage) is provided to the laser gain medium 510, a population inversion occurs in the laser gain medium 510, causing the laser gain medium 510 to emit a plurality of photons toward the wireless charging module 140. These photons form the second light beam L2, and the second light beam L2 is incident on the retroreflector 142 of the wireless charging module 140. Based on the optical properties of the retroreflector 142 (which may be, but is not limited to, a reflectivity of 95%), most of the second light ray L2 is reflected along the incident path and returns to the laser gain medium 510, and the remaining second light ray L2 passes through the retroreflector 142 and is absorbed by the second photoelectric conversion unit 141 and converted into second electrical energy P2.

[0026] In particular, the laser gain medium 510 is an element that has high gain, realizes small size and high efficiency, so selecting infrared light as a wireless charging source is an optimal choice, and converting light rays with a wavelength range of 700 nm to 2500 nm is an optimal choice because it is easily converted into electrical energy. The laser gain medium 510 may be used to amplify the second light ray L2 reflected by the retroreflector 142. In other words, after receiving the second light ray L2 reflected by the retroreflector 142, the laser gain medium 510 emits more photons with the same quantum parameters (direction, wavelength, phase) to the retroreflector 520, and further amplifies the second light ray L2 reflected by the retroreflector 142. Subsequently, the second light ray L2 strikes the retroreflector 520 again and is totally reflected from the retroreflector 520 to the laser gain medium 510 based on the optical properties of the retroreflector 520 (which may be, but is not limited to, 100% reflectivity). The second light ray L2 passes through the laser gain medium 510 again, amplifying its radiation again, before returning along the incident path and partially transmitting through the retroreflector 142. Thus, in the second photoelectric conversion unit 141, a portion of the second light ray L2 is converted back into second electrical energy P2. The retroreflector 142 and the retroreflector 520 form a resonant cavity in free space, and the wireless charging process continues as long as the amplification of the laser gain medium 510 is sufficient to compensate for the loss of the second light ray L2 and the optical path of the portion converted into second electrical energy P2. Therefore, the self-powered display device 100 of the present disclosure has the following advantages when using optical radiation as a wireless charging source: (1) high photoelectric conversion efficiency; (2) photoelectric conversion efficiency is nearly constant regardless of the distance between the light emitter 500 and the wireless charging module 140; (3) wireless network (WiFi), Bluetooth, or other electronic communication means are not affected; (4) the screen occupies a small proportion of the non-display area A2, which is mainly used to absorb the laser light source (infrared), resulting in low air loss of infrared rays and high safety.

[0027] The self-powered display device 100 may further include a storage module 150, such as a rechargeable battery. The storage module 150 is electrically connected to the first photoelectric conversion unit 120 and the second photoelectric conversion unit 141 of the wireless charging module 140 via conductive lines inside the substrate 110. Therefore, the storage module 150 may be used to receive and store the first electric energy P1 and the second electric energy P2 from the first photoelectric conversion unit 120 and the second photoelectric conversion unit 141, and provide the first electric energy P1 and the second electric energy P2 to the translucent display module 130 via the substrate 110.

[0028] Please refer to Figures 3A and 3B together. Figure 3A is a partially transparent top view showing a self-powered display device according to a second example of the first embodiment of the present disclosure, and Figure 3B is a schematic cross-sectional view showing the self-powered display device of Figure 3A. As shown in Figures 3A and 3B, the self-powered display device 200 includes a substrate 210, a first photoelectric conversion unit 220, a translucent display module 230, a second photoelectric conversion unit 241, and a storage module 250, where the second photoelectric conversion unit 241 is different from the first photoelectric conversion unit 220. Each element of the self-powered display device 200 described above is the same as the corresponding element in the self-powered display device 100 of Figures 1A to 1C, and therefore the structural arrangement and functions of the same elements will not be described in detail.

[0029] The difference is that the self-powered display device 200 does not have a retroreflector attached to the substrate 210. Specifically, in applications that do not require wireless charging, the retroreflector can be removed from the non-display area A2 of the substrate 210. The first photoelectric conversion unit 220 located in the display area A1 can convert a first light ray L3 incident from outside the self-powered display device 200 into a first electric energy P1, where the first light ray L3 has a wavelength range of 400 nm to 700 nm. In particular, the second photoelectric conversion unit 241 located in the non-display area A2 can directly absorb a second light ray L4 having a wavelength range of 400 nm to 2500 nm and convert the second light ray L4 into a second electric energy P2. That is, the second photoelectric conversion unit 241 can not only absorb and convert general visible light, but also absorb and convert infrared light, which has a longer wavelength than sunlight, thereby achieving the purpose of increasing power generation.

[0030] Please refer to Fig. 4, which is a partially transparent top view of a self-powered display device according to a first example of the second embodiment of the present disclosure. As shown in Fig. 4, the self-powered display device 300 includes a substrate 310, a first photoelectric conversion unit 320, a light-transmitting display module 330, a wireless charging module 340, and a power storage module 350.

[0031] The substrate 310 has a display area A1 and a non-display area A2. The first photoelectric conversion unit 320 is mounted on the substrate 310 and located in the display area A1. The translucent display module 330 is stacked on the first photoelectric conversion unit 320 and is used to receive a first light beam L5. The first light beam L5 passes through the translucent display module 330 and enters the first photoelectric conversion unit 320. The first photoelectric conversion unit 320 converts the first light beam L5 into a first electric energy P1 and provides the first electric energy P1 to the translucent display module 330. The wireless charging module 340 is used to receive a second light beam L6 and includes a second photoelectric conversion unit 341 and a retroreflector 342. The second photoelectric conversion unit 341 is mounted on the substrate 310 and located in the non-display area A2. The retroreflector 342 is detachably mounted on the substrate 310 and covers the second photoelectric conversion unit 341. A portion of the second light beam L6 passes through the retroreflector 342 and enters the second photoelectric conversion unit 341. The second photoelectric conversion unit 341 converts this portion of the second light beam L6 into second electric energy P2 and provides the second electric energy P2 to the translucent display module 330. Specifically, in addition to the first photoelectric conversion unit 320 and the second photoelectric conversion unit 341, the other elements in the self-powered display device 300 are all the same as the corresponding elements in the self-powered display device 100 of FIG. 1B , and therefore the same structural arrangements and functions of the elements will not be described in detail.

[0032] The difference is that the first photoelectric conversion unit 320 and the second photoelectric conversion unit 341 of the self-powered display device 300 are both organic solar cells or perovskite solar cells, meaning that the first photoelectric conversion unit 320 and the second photoelectric conversion unit 341 are both solar cells of the same type. In this embodiment, the wavelength range of the first light ray L5 absorbed by the first photoelectric conversion unit 320 is the same as the wavelength range of the second light ray L6 absorbed by the second photoelectric conversion unit 341, and the wavelength ranges of the first light ray L5 and the second light ray L6 are both 400 nm to 800 nm. The above arrangement is based on the following reasons.

[0033] Generally, the absorption bands (i.e., wavelength ranges) of the solar cells on the rear surface of the display and the solar cells for wireless charging are very different. The main absorption band of the solar cells on the rear surface of the display is between 400 nm and 700 nm, i.e., visible light. The main absorption band of the solar cells for wireless charging is between 700 nm and 2500 nm, i.e., infrared light. If different types of solar cells are arranged in the display area A1 and the non-display area A2, due to the differences in the electrical characteristics of the two solar cells, different charging chips must be arranged to collect the electrical energy after photoelectric conversion, boost it, and store it in the storage module 350. On the other hand, if the same type of solar cells are arranged in the display area A1 and the non-display area A2, i.e., the first photoelectric conversion unit 320 and the second photoelectric conversion unit 341 are arranged as the same solar cell, spectral matching issues must be considered.

[0034] Please continue to refer to FIGS. 5 and 6. FIG. 5 shows the external quantum efficiency (EQE) spectrum when the first and second photoelectric conversion units of the present disclosure are organic solar cells. FIG. 6 shows the external quantum efficiency spectrum when the first and second photoelectric conversion units of the present disclosure are perovskite solar cells. In this embodiment, the translucent display module 330 is a cholesteric liquid crystal display (LCD) that has a relatively high transmittance for light in the wavelength range of 600 nm to 780 nm. Therefore, the first photoelectric conversion unit 320 should be a solar cell, and its external quantum efficiency can provide a relatively high power generation amount for light in the wavelength range of 600 nm to 780 nm. In addition, to improve the charging efficiency of the wireless charging module 340, the second photoelectric conversion unit 341 should be a solar cell with a relatively high external quantum efficiency in the infrared band. As shown in Figure 5, when the first photoelectric conversion unit 320 and the second photoelectric conversion unit 341 are both organic solar cells, the external quantum efficiency of the self-powered display device 300 in the wavelength range of 400 nm to 800 nm can reach 50% to 80%. As shown in Figure 6, when the first photoelectric conversion unit 320 and the second photoelectric conversion unit 341 are both perovskite solar cells, the external quantum efficiency of the self-powered display device 300 in the wavelength range of 400 nm to 800 nm can also reach 50% to 80%. As a result, the self-powered display device 300 of the present disclosure not only achieves wireless charging functionality, but also further reduces manufacturing steps, reduces costs, and simplifies the internal circuit design by arranging the same type of solar cells in the display area A1 and the non-display area A2.

[0035] Please refer to Figure 7, which is a partially transparent top view showing a self-powered display device according to a second example of the second embodiment of the present disclosure. As shown in Figure 7, the self-powered display device 400 includes a substrate 410, a first photoelectric conversion unit 420, a translucent display module 430, a second photoelectric conversion unit 441, and a storage module 450, where the second photoelectric conversion unit 441 is the same as the first photoelectric conversion unit 420. Since each element of the self-powered display device 400 described above is the same as the corresponding element in the self-powered display device 300 of Figure 4, the same structural arrangement and function of the elements will not be described in detail.

[0036] The difference is that the self-powered display device 400 does not have a retroreflector attached to the substrate 410. Specifically, in applications that do not require wireless charging, the retroreflector can be removed from the non-display area A2 of the substrate 410. The first photoelectric conversion unit 420 located in the display area A1 can convert a first light ray L5 incident from outside the self-powered display device 400 into a first electric energy P1, and the first light ray L5 has a wavelength range of 400 nm to 800 nm. In particular, the second photoelectric conversion unit 441 located in the non-display area A2 directly absorbs a second light ray L6, which also has a wavelength range of 400 nm to 800 nm, and converts the second light ray L6 into a second electric energy P2. This means that both the first photoelectric conversion unit 420 and the second photoelectric conversion unit 441 can absorb and convert ambient light, thereby achieving the purpose of further increasing power generation.

[0037] In summary, the present disclosure has the following advantages: First, a wireless charging module can be installed in the non-display area, which has a small screen occupancy, and the wireless charging function can be used to increase the total power generation for self-power supply; Second, when wireless charging is not required, the retroreflector can be directly removed, while still maintaining high power generation; Third, by arranging the same type of solar cells in the display area and non-display area, the manufacturing process is simple, costs are low, and the internal circuit design of the device can be simplified.

[0038] Although the present disclosure has been disclosed as above by way of embodiments, it is not limited to the above embodiments, and those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure is determined by the content specified in the following claims. [Explanation of symbols]

[0039] 100, 200, 300, 400 Self-powered display 110, 210, 310, 410 board 120, 220, 320, 420 First photoelectric conversion unit 130, 230, 330, 430 Translucent display module 140, 340 Wireless Charging Module 141, 241, 341, 441 Second photoelectric conversion unit 142, 342, 520 Retroreflectors 150, 250, 350, 450 Energy Storage Module 500 Lighting Device 510 Laser gain medium A1 display area A2 Hidden area L1, L3, L5 First rays L2, L4, L6 Second rays P1 First Electric Energy P2 Second Electric Energy

Claims

1. a substrate having a display area and a non-display area; a first photoelectric conversion unit provided on the substrate and positioned in the display area; a light-transmitting display module stacked on the first photoelectric conversion unit and configured to receive a first light ray; a wireless charging module disposed on the substrate and located in the non-display area, for receiving a second light beam, converting the second light beam into a second electric energy, and providing the second electric energy to the light-transmitting display module; Equipped with the first light beam passes through the translucent display module and enters the first photoelectric conversion unit, and the first photoelectric conversion unit converts the first light beam into first electrical energy and provides the first electrical energy to the translucent display module; A self-powered display device, wherein the wavelength range of the first light beam is different from the wavelength range of the second light beam.

2. 2. The self-powered display device according to claim 1, further comprising: a storage module electrically connected to the first photoelectric conversion unit and the wireless charging module, for storing the first electric energy and the second electric energy, and for providing the first electric energy and the second electric energy to the translucent display module.

3. 2. The self-powered display device according to claim 1, wherein the display area is provided adjacent to the non-display area and has an area larger than the non-display area.

4. 2. The self-powered display device of claim 1, wherein the wavelength range of the first light beam is between 400 nm and 700 nm, and the wavelength range of the second light beam is between 700 nm and 2500 nm.

5. The wireless charging module includes: a second photoelectric conversion unit provided on the substrate; a retroreflector that is detachably provided on the substrate and covers the second photoelectric conversion unit; Including, 2. The self-powered display device of claim 1, wherein a portion of the second light beam passes through the retroreflector and enters the second photoelectric conversion unit, and the second photoelectric conversion unit converts the portion of the second light beam into the second electrical energy.

6. The self-powered display device according to claim 5 , wherein the second photoelectric conversion unit is different from the first photoelectric conversion unit.

7. a substrate having a display area and a non-display area; a first photoelectric conversion unit provided on the substrate and positioned in the display area; a light-transmitting display module stacked on the first photoelectric conversion unit and configured to receive a first light ray; a wireless charging module for receiving a second light beam, the wireless charging module including: a second photoelectric conversion unit provided on the substrate and located in a non-display area; and a retroreflector detachably provided on the substrate and covering the second photoelectric conversion unit; Equipped with the first light beam passes through the translucent display module and enters the first photoelectric conversion unit, and the first photoelectric conversion unit converts the first light beam into first electrical energy and provides the first electrical energy to the translucent display module; A portion of the second light beam passes through the retroreflector and enters the second photoelectric conversion unit, and the second photoelectric conversion unit converts the portion of the second light beam into second electric energy and provides the second electric energy to the translucent display module; A self-powered display device, wherein the wavelength range of the first light beam is the same as the wavelength range of the second light beam.

8. 8. The self-powered display device according to claim 7, further comprising a storage module electrically connected to the first photoelectric conversion unit and the second photoelectric conversion unit, for storing the first electric energy and the second electric energy, and for providing the first electric energy and the second electric energy to the translucent display module.

9. 8. The self-powered display device according to claim 7, wherein the display area is provided adjacent to the non-display area and has an area larger than the non-display area.

10. 8. The self-powered display device according to claim 7, wherein the wavelength range of the first light beam and the wavelength range of the second light beam are both between 400 nm and 800 nm.

11. The self-powered display device according to claim 7 , wherein the first photoelectric conversion unit and the second photoelectric conversion unit are both organic solar cells or perovskite solar cells.

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