CN111916020A

CN111916020A - Solar display device and power supply switching method

Info

Publication number: CN111916020A
Application number: CN201910385320.6A
Authority: CN
Inventors: 向瑞杰; 陈志强
Original assignee: Acer Inc
Current assignee: Acer Inc
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-11-10
Anticipated expiration: 2039-05-09
Also published as: CN111916020B

Abstract

The invention provides a solar display device and a power supply switching method. The solar display device comprises a plurality of solar pixel elements, a plurality of micro display elements and a power supply control circuit. The solar pixel element is used for generating a first solar power supply and a second solar power supply. The power control circuit is used for comparing the first solar power with a reference signal. The power control circuit is further configured to drive the plurality of micro-display elements using one of a system power and the second solar power according to the comparison result.

Description

Solar display device and power supply switching method

Technical Field

The present invention relates to a power switching technology, and more particularly, to a solar display device and a power switching method.

Background

Micro light emitting diode (Micro LED) displays have advantages of high brightness, high contrast, wide viewing angle, long lifetime, and low power consumption, and are therefore being used in various display devices. Furthermore, solar energy is an emerging renewable energy source that relies on sunlight to generate electricity. However, the solar power generated by solar power generation is strong and weak under different solar radiation intensities. Therefore, if the micro light emitting diode display is simply combined with the solar power generation technology, the problem of insufficient driving capability of the micro light emitting diode may occur under certain sunshine conditions.

Disclosure of Invention

The invention provides a solar display device and a power supply switching method, which can effectively solve the problems.

The embodiment of the invention provides a solar display device which comprises a plurality of solar pixel elements, a plurality of micro display elements and a power supply control circuit. The plurality of solar pixel elements are used for generating a first solar power supply and a second solar power supply. The plurality of micro-display elements are connected to the plurality of solar pixel elements. The power control circuit is connected to the plurality of solar pixel elements and the plurality of micro-display elements. The power control circuit is used for comparing the first solar power with a reference signal. The power control circuit is further configured to drive the plurality of micro-display elements using one of a system power supply and the second solar power supply according to the comparison result.

The embodiment of the invention also provides a power supply switching method which is used for the solar display device. The solar display device comprises a plurality of solar pixel elements and a plurality of micro display elements. The power supply switching method comprises the following steps: generating a first solar power supply and a second solar power supply by the plurality of solar pixel elements; comparing the first solar power source to a reference signal; and driving the plurality of micro-display elements using one of a system power supply and the second solar power supply according to the comparison result.

Based on the above, the solar pixel element in the solar display device can generate the first solar power and the second solar power. After comparing the first solar power supply with the reference signal, a system power supply of the solar display device or a second solar power supply may be used to drive a micro display element in the solar display device according to the comparison result. Therefore, the display and driving capability of the solar display device can be kept stable under any sunshine condition, and balance between power saving and system efficiency is achieved.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic diagram of a solar display apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a power control circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a power control circuit according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

fig. 10 is a flowchart illustrating a power switching method according to an embodiment of the invention.

The reference numbers illustrate:

10: solar energy display device

11: solar pixel array

12: hybrid pixel array

13: power supply control circuit

101. 102: solar pixel element

103. LED (1): micro display element

201: data line

202: scanning line

21. 61: comparator with a comparator circuit

22. 62: switching circuit

23. 63: controller

SW (1) to SW (6): transistor with a metal gate electrode

Cst, Cdata, Csol: capacitor with a capacitor element

SP (1), SP (2): solar energy power supply

And RS: reference signal

DP: data power supply

Vdd: working power supply

203: updating line

CS: control signal

EP: external power supply

603: light emitting module

PD (1), PD (2): unidirectional diode

ZD: zener diode

S1001 to S1003: step (ii) of

Detailed Description

Fig. 1 is a schematic view of a solar display device according to an embodiment of the present invention. Referring to fig. 1, in an embodiment, the solar display device 10 may be a wearable device such as a smart watch or a smart bracelet supporting solar power supply and having a display function. Alternatively, in an embodiment, the solar display device 10 may also be various electronic devices with a display function and supporting solar power supply, such as a smart phone, a tablet computer, or a kiosk. The present invention is not limited to the type of the solar display apparatus 10.

The solar display device 10 includes a solar pixel array 11, a hybrid pixel array 12, and a power control circuit 13. The solar pixel array 11 includes a plurality of solar pixel elements 101. Each of the solar pixel elements 101 includes one or more dies, and it is used to induce insolation to generate a solar power (also referred to as a first solar power).

The hybrid pixel array 12 includes a plurality of solar pixel elements 102 and a plurality of micro-display elements 103. The solar pixel element 102 is connected (e.g., electrically connected) to the micro-display element 103. The solar pixel element 101 may be the same or similar to the solar pixel element 102. For example, each of the solar pixel elements 102 includes one or more dies and is used to induce insolation to generate a solar power source (also referred to as a second solar power source). Further, each of the micro display elements 103 is a micro light emitting diode (micro LED), and is configured to emit light driven by a current.

In the present embodiment, the solar pixel array 11 is disposed in the inactive display area of the solar display device 10, and the hybrid pixel array 12 is disposed in the active display area of the solar display device 10. The inactive display region does not have a function of displaying an image, while the active display region has a function of displaying an image (provided by the micro display elements 103). For example, in a smart watch, the solar pixel array 11 may be located in an inactive display area of the watch surface, and the hybrid pixel array 12 may be located in an active display area of the watch surface. In the active display area, the micro display elements 103 arranged in an array can be used for displaying information such as system time, weather, instant information and/or incoming calls.

It should be noted that, in an embodiment, the solar pixel array 11 may not be provided. In one embodiment, if the solar pixel array 11 is not provided, both the first solar power source and the second solar power source can be generated by the solar pixel elements 102 in the hybrid pixel array 12. Furthermore, in one embodiment, one solar pixel element 102 may be used to power one or more connected microdisplay elements 103.

The power supply control circuit 13 is connected to the solar pixel element 101, the solar pixel element 102, and the micro display element 103. The power control circuit 13 is used for comparing the first solar power with the reference signal. According to the comparison result, the power control circuit 13 may drive the micro display element 103 using one of the system power and the second solar power of the solar display device 10. For example, if the current value of the first solar power is higher than the current value of the reference signal (also referred to as the first comparison result), the power control circuit 13 may drive the micro display element 103 using the second solar power. Alternatively, if the current value of the first solar power is not higher than the current value of the reference signal (also referred to as the second comparison result), the power control circuit 13 may drive the micro display element 103 using the system power.

In one embodiment, the system power is data power (also referred to as data signals) provided via data lines in the hybrid pixel array 12. This data power may be used to drive the microdisplay device 103. Alternatively, in one embodiment, the system power is an external power provided by an external power supply of the solar display apparatus 10. This external power source may also be used to drive the microdisplay device 103.

Fig. 2 is a schematic diagram of a power control circuit according to an embodiment of the invention. Referring to fig. 2, in the present embodiment, the power control circuit 13 includes a comparator 21, a switch circuit 22 and a controller 23. The controller 23 is connected to the comparator 21 and the switch circuit 22. The comparator 21 can receive the solar power SP (1) (i.e., the first solar power) and the reference signal RS. In one embodiment, the reference signal RS may be provided by an internal circuit (not shown). Alternatively, in one embodiment, the controller 23 may generate the reference signal RS by looking up a table and provide the reference signal RS to the comparator 21.

The comparator 21 may compare the solar power supply SP (1) with the reference signal RS and generate a comparison signal according to the comparison result. The controller 23 may control the switching circuit 22 to drive the micro display element LED (1) using the system power (e.g., the data power DP) or the solar power SP (2) (i.e., the second solar power) according to the comparison signal. For example, the micro display element LED (1) may be any one of the micro display elements 103 in fig. 1.

Specifically, in the present embodiment, the hybrid pixel array 12 includes data lines 201, scan lines 202, transistors SW (1), SW (2), a capacitor Cst, and a micro display element LED (1). A first terminal (e.g., a gate) of the transistor SW (1) is connected to the scan line 202. A second terminal (e.g., a source) of the transistor SW (1) is connected to the data line 201. A third terminal (e.g., a drain) of the transistor SW (1) is connected to a first input terminal of the switch circuit 22. A second input of the switching circuit 22 is connected to the solar pixel element 102 to receive a solar power supply SP (2). A first terminal (e.g., gate) of the transistor SW (2) is connected to an output terminal of the switch circuit 22. A second terminal (e.g., source) of the transistor SW (2) is connected to the operating power supply Vdd. The third terminal (e.g., drain) of the transistor SW (2) is connected to the microdisplay element LED (1). Capacitor Cst may be connected to a first terminal of transistor SW (2). In addition, the transistors SW (1) and SW (2) may both be Thin Film Transistors (TFTs).

According to the comparison result of the comparator 21, the controller 23 may control the switch circuit 22 to supply the data power DP (i.e., the system power) or the solar power SP (2) from the data line 201 to the first terminal of the transistor SW (2) to drive the micro display element LED (1) through the third terminal of the transistor SW (2). For example, in response to the first comparison result (e.g., the current value of the solar power SP (1) is higher than the current value of the reference signal RS), the controller 23 may control the switching circuit 22 to supply the solar power SP (2) to the transistor SW (2) to drive the micro display element LED (1). Alternatively, in response to the second comparison result (e.g., the current value of the solar power supply SP (1) is not higher than the current value of the reference signal RS), the controller 23 may control the switching circuit 22 to supply the data power supply DP to the transistor SW (2) to drive the micro display element LED (1).

Fig. 3 is a schematic diagram of a switching circuit according to an embodiment of the present invention. Referring to fig. 3, in the present embodiment, the switch circuit 22 includes a refresh line 203, transistors SW (3) to SW (6), a capacitor Cdata, and a capacitor Csol. A first terminal (e.g., a gate) of the transistor SW (3) is configured to receive the control signal CS from the controller 23 of fig. 2. A second terminal (e.g., a source) of the transistor SW (3) is configured to receive the solar power SP (2). A first terminal (e.g., gate) of the transistor SW (4) is connected to the third terminal of the transistor SW (1). A second terminal (e.g., source) of the transistor SW (4) is connected to a third terminal (e.g., drain) of the transistor SW (3). A first terminal (e.g., a gate) of the transistor SW (5) is connected to the scan line 202. A second terminal (e.g., a source) of the transistor SW (5) is connected to the third terminal of the transistor SW (1). A first terminal (e.g., gate) of transistor SW (6) is connected to the refresh line 203. A second terminal (e.g., source) of the transistor SW (6) is connected to a third terminal (e.g., drain) of the transistor SW (4). A third terminal (e.g., a drain) of the transistor SW (5) is connected to a third terminal (e.g., a drain) of the transistor SW (6) and the first terminal of the transistor SW (2).

The refresh line 203 provides a refresh signal to turn on the transistor SW (6) corresponding to a frame (frame) when displaying an image. In response to the control signal CS turning on the transistor SW (3), the solar power SP (2) can be provided to the first terminal of the transistor SW (2) through the transistors SW (3), SW (4) and SW (6) to drive the micro-display element LED (1). Alternatively, in response to the control signal CS not turning on the transistor SW (3), the scan signal on the scan line 202 may turn on the transistors SW (1) and SW (5), and the data power DP may be provided to the first terminal of the transistor SW (2) through the transistor SW (5) to drive the micro-display element LED (1).

Fig. 4 is a schematic diagram of a switching circuit according to an embodiment of the present invention. Referring to fig. 4, in the present embodiment, the first terminal (e.g., gate) of the transistor SW (5) and the first terminal (e.g., gate) of the transistor SW (6) are both connected to the refresh line 203. A second terminal (e.g., a drain) of the transistor SW (6) is connected to the third terminal of the transistor SW (5) and the third terminal of the transistor SW (4). A third terminal (e.g., a drain) of the transistor SW (6) is connected to the first terminal of the transistor SW (2).

The refresh line 203 provides refresh signals to turn on the transistors SW (5) and SW (6). In response to the control signal CS turning on the transistor SW (3), the solar power SP (2) may be provided to the transistor SW (2) through the transistors SW (3), SW (4) and SW (6). Alternatively, in response to the control signal CS not turning on the transistor SW (3), the scan signal on the scan line 202 may turn on the transistors SW (1) and SW (5), and the data power DP may be provided to the transistor SW (2) through the transistors SW (5) and SW (6).

Fig. 5 is a schematic diagram of a switching circuit according to an embodiment of the present invention. Referring to fig. 5, in the present embodiment, a first end (e.g., a gate) of the transistor SW (5) is connected to the scan line 202. A second terminal (e.g., source) of the transistor SW (5) is connected to a third terminal of the transistor SW (4). A third terminal (e.g., a drain) of the transistor SW (5) is connected to the first terminal of the transistor SW (2) and to the third terminal of the transistor SW (1) via the capacitor Cdata.

The scan line 202 provides a scan signal to the first terminal of the transistor SW (5) to turn on the transistor SW (5). In response to the control signal CS turning on the transistor SW (3), the solar power SP (2) may be provided to the transistor SW (2) through the transistors SW (3), SW (4) and SW (5). Alternatively, the data power supply DP may be supplied to the transistor SW (2) via the capacitor Cdata in response to the control signal CS not turning on the transistor SW (3).

It should be noted that in the embodiments of fig. 3 and 4, the transistors SW (3), SW (5) and SW (6) are thin film transistors, and the transistor SW (4) is an N-type metal oxide semiconductor field effect transistor (NMOS). However, in the embodiment of FIG. 5, transistors SW (3) and SW (5) are thin film transistors and transistor SW (4) is a P-type metal oxide semiconductor field effect transistor (PMOS).

Fig. 6 is a schematic diagram of a power control circuit according to an embodiment of the invention. Referring to fig. 6, in the present embodiment, the power control circuit 13 includes a comparator 61, a switch circuit 62 and a controller 63. The controller 63 is connected to the comparator 61 and the switch circuit 62. The comparator 61 may compare the solar power supply SP (1) with the reference signal RS and generate a comparison signal according to the comparison result. The controller 63 may control the switching circuit 62 to drive the micro display element LED (1) using the system power source (e.g., the external power source EP) or the solar power source SP (2) (i.e., the second solar power source) according to the comparison signal.

According to the comparison result of the comparator 61, the controller 63 may control the switch circuit 62 to supply the external power EP (i.e., the system power) or the solar power SP (2) provided by the external power supply to the second terminal of the transistor SW (2) as the operating power Vdd, so as to drive the micro-display element LED (1) through the third terminal of the transistor SW (2). For example, in response to the first comparison result (e.g., the current value of the solar power supply SP (1) is higher than the current value of the reference signal RS), the controller 63 may control the switching circuit 62 to supply the solar power supply SP (2) as the operating power supply Vdd to the transistor SW (2) to drive the micro display element LED (1). Alternatively, in response to the second comparison result (e.g., the current value of the solar power supply SP (1) is not higher than the current value of the reference signal RS), the controller 63 may control the switching circuit 62 to supply the external power supply EP as the operating power supply Vdd to the transistor SW (2) to drive the micro display element LED (1).

In the embodiment of fig. 6, one light emitting module 603 may include a transistor SW (1), a transistor SW (2), a capacitor Cst, and a micro display element LED (1). An operating power supply Vdd may be provided to the light emitting module 603 for use by the electronic components therein, such as the transistor SW (2).

Fig. 7 is a schematic diagram of a switching circuit according to an embodiment of the present invention. Referring to fig. 7, in the present embodiment, the switch circuit 62 includes a transistor SW (3), a unidirectional diode PD (1) and a unidirectional diode PD (2). A first terminal (e.g., a gate) of the transistor SW (3) is used for receiving a control signal CS from the controller 63 of fig. 6. A second terminal (e.g., a source) of the transistor SW (3) is configured to receive the solar power SP (2). A third terminal (e.g., drain) of the transistor SW (3) is connected to the first terminal of the unidirectional diode PD (1). The second terminal of the unidirectional diode PD (1) is connected to the light emitting module 603. The first terminal of the unidirectional diode PD (2) is configured to receive an external power source EP. The second terminal of the unidirectional diode PD (2) is connected to the light emitting module 603 and the second terminal of the unidirectional diode PD (1).

In response to the control signal CS turning on the transistor SW (3), the solar power SP (2) can be provided to the light emitting module 603 as the operating power Vdd through the transistor SW (3) and the unidirectional diode PD (1). Alternatively, in response to the control signal CS not turning on the transistor SW (3), the external power EP may be supplied as the operating power Vdd to the light emitting module 603 via the one-way diode PD (2).

Fig. 8 is a schematic diagram of a switching circuit according to an embodiment of the present invention. Referring to fig. 8, compared to the embodiment shown in fig. 7, in the present embodiment, the switch circuit 62 further includes a zener diode ZD. The zener diode ZD is connected in series between the unidirectional diodes PD (1) and PD (2). For example, the anode (anode) terminal of the zener diode ZD is connected to the unidirectional diode PD (1), and the cathode (cathode) terminal of the zener diode ZD is connected to the unidirectional diode PD (2).

Compared to the embodiment of fig. 7, the transistor SW (3) is turned on in response to the control signal CS, and the solar power SP (2) needs to overcome the voltage difference caused by the zener diode ZD to be provided to the light emitting module 603. This can further improve the reliability of the switch circuit 62.

Fig. 9 is a schematic diagram of a switching circuit according to an embodiment of the present invention. Referring to fig. 9, in the present embodiment, the switch circuit 62 includes a transistor SW (3), a transistor SW (4) and a unidirectional diode PD (1). A first terminal (e.g., a gate) of the transistor SW (4) is connected to the third terminal of the transistor SW (3) and the first terminal of the unidirectional diode PD (1). A second terminal (e.g., source) of the transistor SW (4) is connected to the external power supply EP. A third terminal (e.g., a drain) of the transistor SW (4) is connected to the second terminal of the unidirectional diode PD (1) and the light emitting module 603.

It is noted that in the present embodiment, the transistor SW (4) is a P-type metal oxide semiconductor field effect transistor (PMOS). In response to the control signal CS turning on the transistor SW (3) and the voltage of the solar power supply SP (2) being higher than the voltage of the external power supply EP, the transistor SW (4) is not turned on, so that the solar power supply SP (2) can be provided to the light emitting module 603 as the operating power supply Vdd through the transistor SW (3) and the unidirectional diode PD (1). Alternatively, in response to the control signal CS not turning on the transistor SW (3) or the voltage of the solar power supply SP (2) is not higher than the voltage of the external power supply EP, the transistor SW (4) may be turned on, and the external power supply EP may be provided as the operating power supply Vdd to the light emitting module 603 via the transistor SW (4).

It should be noted that, in the foregoing embodiments, the number, types and connection relationships of the electronic components are only examples, and are not intended to limit the invention. In other embodiments, the connection relationship of at least some of the electronic elements may be changed, at least some of the electronic elements may be replaced with other electronic elements having the same or similar functions, and/or more electronic elements may be added to the circuit structure to provide additional functions.

Fig. 10 is a flowchart illustrating a power switching method according to an embodiment of the invention. Referring to fig. 10, in step S1001, a first solar power and a second solar power are generated from a plurality of solar pixel elements in a solar display device. In step S1002, the first solar power source is compared with a reference signal. In step S1003, the plurality of micro display elements in the solar display device are driven using one of the system power supply and the second solar power supply of the solar display device according to the comparison result.

However, the steps in fig. 10 have been described in detail above, and are not described again here. It is to be noted that, the steps in fig. 10 can be implemented as a plurality of program codes or circuits, and the invention is not limited thereto. In addition, the method of fig. 10 can be used with the above embodiments, or can be used alone, and the invention is not limited thereto.

In summary, the solar pixel element in the solar display device can generate the first solar power and the second solar power. After comparing the first solar power supply with the reference signal, a system power supply of the solar display device or a second solar power supply may be used to drive a micro display element in the solar display device according to the comparison result. Therefore, the display and driving capability of the solar display device can be kept stable under any sunshine condition, and balance between power saving and system efficiency is achieved.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A solar energy display device comprising:

the solar pixel elements are used for generating a first solar power supply and a second solar power supply;

a plurality of micro-display elements connected to the plurality of solar pixel elements; and

a power control circuit connected to the plurality of solar pixel elements and the plurality of micro-display elements,

wherein the power control circuit is configured to compare the first solar power with a reference signal, and

the power control circuit is further configured to drive the plurality of micro-display elements using one of a system power supply and the second solar power supply according to the comparison result.

2. The solar display device of claim 1, wherein each of the plurality of micro display elements is a micro light emitting diode.

3. The solar display device of claim 1, wherein the plurality of solar pixel elements comprises:

the first solar pixel element is arranged in a non-active display area of the solar display device and used for generating the first solar power supply; and

and the second solar pixel element is arranged in the active display area of the solar display device and is used for generating the second solar power supply.

4. The solar display apparatus of claim 1, wherein the power control circuit comprises:

a comparator for comparing the first solar power supply with the reference signal and generating a comparison signal;

a switching circuit; and

a controller connected to the comparator and the switching circuit,

wherein the controller controls the switching circuit to drive the plurality of micro display elements using the one of the system power supply and the second solar power supply according to the comparison signal.

5. The solar display apparatus of claim 1, further comprising:

scanning a line;

a data line;

a first transistor having a first terminal connected to the scan line, a second terminal connected to the data line, and a third terminal connected to the power control circuit; and

a second transistor having a first terminal connected to the power control circuit, a second terminal connected to a working power source, and a third terminal connected to a first micro display element among the plurality of micro display elements,

wherein the operation of the power supply control circuit to drive the plurality of micro-display elements using the one of the system power supply and the second solar power supply according to the comparison result includes:

providing the one of the system power supply and the second solar power supply to the first terminal of the second transistor according to the comparison result to drive the first micro-display element via the third terminal of the second transistor.

6. The solar display device of claim 5, wherein the system power supply comprises a data power supply from the data line, and the operation of the power supply control circuit to provide the one of the system power supply and the second solar power supply to the first terminal of the second transistor comprises:

providing the second solar power to the first terminal of the second transistor in response to a first comparison result; and

providing the data power supply to the first terminal of the second transistor in response to a second comparison result.

7. The solar display apparatus of claim 5, wherein the power control circuit comprises:

a third transistor, a first end of which is used for receiving a control signal, and a second end of which is used for receiving the second solar power supply; and

a fourth transistor having a first terminal connected to the third terminal of the first transistor, a second terminal connected to a third terminal of the third transistor, and a third terminal connected to the first terminal of the second transistor,

wherein the third transistor provides the second solar power to the first terminal of the second transistor via the fourth transistor in response to the control signal.

8. The solar display apparatus of claim 7, wherein the power control circuit further comprises:

a refresh line for providing a refresh signal;

a fifth transistor of which a first terminal is connected to the scan line, a second terminal is connected to the third terminal of the first transistor, and a third terminal is connected to the first terminal of the second transistor; and

a sixth transistor having a first terminal connected to the refresh line, a second terminal connected to the third terminal of the fourth transistor, and a third terminal connected to the third terminal of the fifth transistor and the first terminal of the second transistor.

9. The solar display apparatus of claim 7, wherein the power control circuit further comprises:

a refresh line for providing a refresh signal;

a fifth transistor of which a first terminal is connected to the refresh line, a second terminal is connected to the third terminal of the first transistor, and a third terminal is connected to the third terminal of the fourth transistor; and

a sixth transistor having a first terminal connected to the refresh line, a second terminal connected to the third terminal of the fifth transistor and the third terminal of the fourth transistor, and a third terminal connected to the first terminal of the second transistor.

10. The solar display apparatus of claim 7, wherein the power control circuit further comprises:

a fifth transistor of which a first terminal is connected to the scan line, a second terminal is connected to the third terminal of the fourth transistor, and a third terminal is connected to the first terminal of the second transistor; and

a capacitor having a first terminal connected to the third terminal of the first transistor and a second terminal connected to the third terminal of the fifth transistor and the first terminal of the second transistor.

11. The solar display apparatus of claim 1, further comprising:

scanning a line;

a data line;

a first transistor having a first terminal connected to the scan line and a second terminal connected to the data line; and

a second transistor having a first terminal connected to a third terminal of the first transistor, a second terminal connected to a working power supply, and a third terminal connected to a first micro display element among the plurality of micro display elements,

and providing the one of the system power supply and the second solar power supply as the working power supply to the second terminal of the second transistor according to the comparison result so as to drive the first micro-display element through the third terminal of the second transistor.

12. The solar display device according to claim 11, wherein the system power supply includes an external power supply provided by an external power supply, and the operation of the power supply control circuit providing the one of the system power supply and the second solar power supply as the operating power supply to the second terminal of the second transistor includes:

providing the second solar power as the operating power to the second terminal of the second transistor in response to a first comparison result; and

in response to a second comparison result, the external power supply is supplied as the operating power supply to the second terminal of the second transistor.

13. The solar display apparatus of claim 11, wherein the power control circuit comprises:

a first unidirectional diode having a first terminal connected to a third terminal of the third transistor and a second terminal connected to the second terminal of the second transistor,

wherein the third transistor provides the second solar power to the second terminal of the second transistor via the first unidirectional diode in response to the control signal.

14. The solar display device of claim 13, wherein the system power supply comprises an external power supply provided by an external power supply, and the power control circuit further comprises:

a second unidirectional diode having a first terminal for receiving the external power source and a second terminal connected to the second terminal of the first unidirectional diode and the second terminal of the second transistor.

15. The solar display apparatus of claim 14, wherein the power control circuit further comprises:

and the zener diode is connected between the first unidirectional diode and the second unidirectional diode in series.

16. The solar display device of claim 13, wherein the system power supply comprises an external power supply provided by an external power supply, and the power control circuit further comprises:

a fourth transistor having a first terminal connected to the third terminal of the third transistor, a second terminal for receiving the external power, and a third terminal connected to the second terminal of the first unidirectional diode and the second terminal of the second transistor.

17. A power switching method for a solar display device, wherein the solar display device comprises a plurality of solar pixel elements and a plurality of micro-display elements, and the power switching method comprises:

generating a first solar power supply and a second solar power supply by the plurality of solar pixel elements;

comparing the first solar power source to a reference signal; and

driving the plurality of micro-display elements using one of a system power supply and the second solar power supply according to the comparison result.