TWI442446B - Light-emitting device and display apparatus - Google Patents

Description

Light-emitting element and display device

The present invention relates to a light-emitting element, and more particularly to a light-emitting element that emits light using a phosphor layer and a display device using the same.

At present, two types of light-emitting structures are mainly used in a mass-produced light source device or display device, including:

1. Gas discharge light source: applied to, for example, a plasma panel or a gas discharge lamp, mainly using an electric field between the cathode and the anode to free the gas filled in the discharge chamber, and causing the electron to be discharged by a glow discharge After the gas is struck, a transition occurs and ultraviolet light is emitted, and the fluorescent layer, which is also located in the discharge chamber, absorbs ultraviolet light and emits visible light.

2. Field emission light source: applied to, for example, a carbon nanotube field emission display, etc., mainly providing an ultra-high vacuum environment, and fabricating an electron emitter of a nano carbon material on the cathode to utilize electron emission The microstructure of the high aspect ratio in the end helps the electrons to break away from the cathode against the work function of the cathode. Further, a phosphor layer is coated on an anode made of indium tin oxide (ITO) to cause electrons to escape from the carbon nanotube of the cathode by a high electric field between the cathode and the anode. As such, the electrons can strike the phosphor layer on the anode in a vacuum environment to emit visible light.

However, both of the above-described light-emitting structures have their disadvantages. For example, due to the attenuation problem after exposure to ultraviolet light, special requirements are required for the material selection in the gas discharge source. In addition, because the light-emitting mechanism of gas discharge can emit visible light after two processes, the energy loss is large, and if plasma is generated in the process, it is more power-consuming. On the other hand, the field emission source needs to grow or coat a uniform electron emission end on the cathode, but the technology for producing such a cathode structure on a large scale is not yet mature, and the uniformity of the electron emission end and the production yield are not good. bottleneck. In addition, the distance between the cathode and the anode of the field emission light source needs to be controlled accurately, and the packaging of the ultra-high vacuum degree is difficult, and the manufacturing cost is relatively increased.

One embodiment of the present invention provides a light emitting device including a hermetic container, a low pressure gas, an anode, a cathode, and a phosphor layer. The closed container defines a confined space, and the confined space is located inside the closed container. The low pressure gas is filled in the sealed space. The anode is disposed outside the sealed container. The cathode is disposed outside the sealed container, wherein the anode and the cathode are respectively located on opposite sides of the sealed space. The phosphor layer is disposed in a confined space.

Another embodiment of the present invention provides a display device including a plurality of the above-described light-emitting elements, wherein the light-emitting elements are arranged in an array.

In order to make the above-described features of the present invention more comprehensible, the following detailed description of the embodiments will be described in detail below.

The light-emitting element proposed by the invention has the advantages of the conventional gas discharge light source and the field emission light source, and overcomes the disadvantages of the two conventional light-emitting structures. Please refer to FIG. 1 for a comparison diagram of the above two conventional light-emitting structures and the light-emitting mechanism of the light-emitting element of the present invention. In more detail, the conventional gas glow discharge source utilizes an electric field between the cathode and the anode to free the gas filled in the discharge chamber, and the gas is electrically conductive to cause the electrons to collide with other gas molecules to generate ultraviolet light. The light layer absorbs ultraviolet light and emits visible light. In addition, conventional field emission sources are in an ultra-high vacuum environment, with the high aspect ratio structure of the electron-emitting end on the cathode to help the electrons out of the cathode against the work function of the cathode. Thereafter, electrons escape from the electron-emitting end of the cathode by a high electric field between the cathode and the anode, and strike the phosphor layer on the anode to emit visible light. That is to say, the material of the phosphor layer can be made of a material that emits visible light, infrared light, or ultraviolet light according to the design mechanism.

Different from the above two conventional illuminating mechanisms, the illuminating element of the present invention does not need to form an electron-emitting end, but uses an alternating current power source or a pulse power source to dissociate a thin gas to generate electrons and directly connect the electrons to the phosphor layer. The reaction emits light.

Compared with the conventional gas glow discharge light source, the amount of gas filled in the light-emitting element of the present invention only needs to be able to dissociate the electrons when subjected to the action of the alternating current power source or the pulse power source, and does not generate glow discharge, and is not The phosphor layer is irradiated with ultraviolet light to generate light, so there is no need to worry about the attenuation of the material in the element by ultraviolet light. It has been experimentally and theoretically verified that the gas in the light-emitting element of the present invention is relatively thin, so that the average free path of electrons can reach about 5 mm or more. In other words, most of the electrons hit the phosphor layer directly before they hit the molecules of the gas, emitting light. In addition, the light-emitting element of the present invention does not need to generate light through two processes, so that the luminous efficiency is high, and the energy loss can also be reduced.

On the other hand, in the conventional field emission light source, it is necessary to form a microstructure as an electron-emitting end on the cathode, which is difficult to control in a large-area process. The most commonly used microstructure is a carbon nanotube. On the coating of the cathode, there are problems of different lengths of carbon tubes and clustering, so that the light-emitting surface has dark spots and the uniformity of light emission is poor. It has always been a technical bottleneck and cost source for field emission sources. In contrast, the light-emitting element of the present invention can dissociate the gas by an alternating current power source or a pulse power source, so that only a simple cathode planar structure is required to achieve a luminous uniformity of 80% of the light-emitting element of the present invention. The above-mentioned degree solves the bottleneck that the uniformity of illumination of the conventional field emission illuminating device is difficult to be improved. Therefore, the manufacturing cost can be greatly saved, and the process is also relatively simple. In addition, the illuminating element of the present invention is filled with a thin gas, so that it is not required to be super The high vacuum environment avoids the difficulties encountered in ultra-high vacuum packaging.

2 is a cross-sectional view of a light-emitting element according to an embodiment of the present invention, and FIGS. 3A to 3C are waveform diagrams of driving voltages for driving the light-emitting element of FIG. 2. Referring to FIG. 2 and FIG. 3 , the light emitting device 100 of the present embodiment includes a sealed container 110 , a low pressure gas 122 , an anode 150 , a cathode 160 , and a phosphor layer 140 . The hermetic container 110 defines a confined space 120, and the confined space 120 is located inside the hermetic container 110. Further, the low pressure gas 122 is filled in the sealed space 120. In this embodiment, the sealed container 110 includes a first substrate 112, a second substrate 114, and a sealing structure 116. The second substrate 114 is opposite to the first substrate 112 , and the sealing structure 116 is disposed on the edge of the first substrate 112 and the second substrate 114 , wherein the first substrate 112 , the second substrate 114 , and the sealing structure 116 surround the sealed space 120 . In the present embodiment, the sealing structure 116 is, for example, in a frame shape to surround the sealed space 120. In addition, the sealing structure 116 is connected between the first substrate 112 and the second substrate 114 to seal the low pressure body in the sealed space 120.

In the present embodiment, the first substrate 112 and the second substrate 114 are, for example, glass substrates. However, in other embodiments, the first substrate 112 and the second substrate 114 may also be transparent substrates of other materials. In addition, in the embodiment, the material of the sealing structure 116 is, for example, a glass sealant. However, in other embodiments, the material of the sealing structure 116 may be other materials that can seal the space between the first substrate 112 and the second substrate 114, or the sealing structure 116 may be other than the first substrate 112. A mechanism for sealing the space between the second substrate 114. Further, the pressure of the low pressure gas 122 is, for example, between 5 × 10 ^-1 torr and 1 × 10 ^-3 torr. In addition, the low pressure gas includes air, helium, neon, argon, helium, neon, hydrogen, carbon dioxide or oxygen, or any combination of the foregoing.

The anode 150 is disposed outside the hermetic container 110, and the cathode 160 is disposed outside the hermetic container 110, wherein the anode 150 and the cathode 160 are respectively located on opposite sides of the sealed space 120. In this embodiment, the anode 150 is disposed on the first substrate 112, and the cathode 160 is disposed on the second substrate 114. In addition, in the embodiment, the first substrate 112 is disposed between the anode 150 and the second substrate 114 , and the second substrate 114 is disposed between the first substrate 112 and the cathode 160 .

At least one of the anode 150 and the cathode 160 is a transparent conductive layer. Alternatively, at least one of the anode 150 and the cathode 160 is made of a metal or a carbon nanotube. For example, in this embodiment, both the anode 150 and the cathode 160 are transparent conductive layers, and the transparent conductive layer is made of, for example, indium tin oxide (ITO), fluorine-doped tin oxide (FTO), and aluminum doped oxidation. Tin (AZO), gallium-doped zinc oxide film (GZO) or other transparent conductive material. Alternatively, in other embodiments, one of the anode 150 and the cathode 160 may be a transparent conductive layer, and the other of the anode 150 and the cathode 160 may be a metal layer or a carbon nanotube layer. Alternatively, in other embodiments, the anode 150 and the cathode 160 may both be a metal layer or a carbon nanotube, and at least one of the anode 150 and the cathode 160 may be meshed to achieve a light transmitting effect.

The phosphor layer 140 is disposed in the sealed space 120. In the present embodiment, the phosphor layer 140 is, for example, a phosphor layer that emits visible light after being struck by electrons. In addition, in the embodiment, the phosphor layer 140 is disposed on the first substrate 112. However, in other embodiments, the phosphor layer 140 may also be disposed on the second substrate 114. In the present embodiment, the phosphor layer 140 can be formed by printing a phosphor powder on the first substrate 112 by means of masking, screen printing or spraying.

In this embodiment, the light-emitting element 100 further includes a power source 170 electrically connected to the anode 150 and the cathode 160 to provide an alternating voltage, as shown in FIG. 3A, FIG. 3B or FIG. 3C, that is, the alternating current. The voltage signal can be a sine wave (Fig. 3A), a square wave (Fig. 3B), a triangular wave (Fig. 3C) or an AC voltage signal of other suitable shape. The alternating voltage is adapted to dissociate the low pressure gas 122 to produce a plurality of electrons 180. Specifically, the AC voltage The gas molecules can be dissociated into gas ions 130 and electrons 180. These electrons 180 strike the phosphor layer 140 under the action of an alternating voltage to cause the phosphor layer 140 to emit light. In this embodiment, since the first substrate 112, the second substrate 114, the anode 150, and the cathode 160 of the light emitting device 100 are all transparent, the light 142 emitted by the phosphor layer 140 can be sequentially passed through the first substrate 112 and the anode. The 150 is transmitted to the outside and can be transmitted to the outside via the second substrate 114 and the cathode 160 in sequence.

In the light-emitting element 100 of the present embodiment, since the anode 150 and the cathode 160 are located outside the sealed container 110, it is possible to effectively prevent the anode 150 and the cathode 160 from being damaged by the impact of ions or electrons, so the service life of the light-emitting element 100 Can be effectively extended. In addition, the light-emitting element 100 of the present embodiment does not need to generate light through two processes as compared with the conventional gas discharge light source, and thus the luminous efficiency is high, and the energy loss can also be reduced. In addition, compared with the conventional field emission light source, the light-emitting element 100 of the present embodiment is filled with a thin gas, so that an ultra-high vacuum environment is not required, so that the difficulty encountered in ultra-high vacuum packaging can be avoided. Further, it is difficult to achieve uniform light emission compared to the field emission light source. In the light-emitting element 100 of the present embodiment, uniform light emission can be easily achieved by uniformly coating the fluorescent layer 140, so that the process is relatively simple. In addition, the light-emitting element 100 of the present embodiment has a simple structure, and therefore the process is relatively simple.

The color, color temperature and color rendering properties of the light-emitting element 100 of the present embodiment can be customized to suit the needs of the user by selecting the material of the phosphor layer. In addition, the light-emitting element 100 of the present embodiment also has environmental characteristics of short response time and no mercury. Furthermore, since the low-pressure gas inside the light-emitting element 100 of the present embodiment is similar to the vacuum environment inside the vacuum glass, the light-emitting element 100 of the present embodiment can be used as a window, a floor-to-ceiling window or a glass curtain of a building instead of a vacuum glass. To achieve insulation and sound insulation. When the light-emitting element 100 is used in place of the vacuum glass, since the light-emitting element 100 has a light-transmitting effect, natural light can be passed during the daytime to allow indoor illumination by using the neon light, and the user can also view the outdoor through the light-emitting element 100. view. In addition, since the first substrate 112, the second substrate 114, the anode 150, and the cathode 160 of the light-emitting element 100 are all transparent, the light-emitting element 100 has an effect of emitting light on both sides. Therefore, when the light-emitting element 100 is used at night, not only can the bright area be presented externally, but also the internal light can be used as an auxiliary light source for indoor illumination, and the illumination of the room can be similar to the illumination environment of natural light during the day. When the light-emitting element 100 is used in the summer instead of the vacuum glass, the heat insulation effect can prevent the outdoor heat from entering the room to save electricity for cold air. When the light-emitting element 100 is used in winter, the heat insulation effect can prevent the indoor heat from escaping outside, thereby saving heating power.

In addition, the light-emitting element 100 can also be formed into various sizes and various shapes (for example, a shape such as a rectangle, a square, or a circle) according to the use requirements, in order to improve the usage rate. In addition to being used for windows of buildings, the light-emitting element 100 can also be applied to outdoor billboards, signs or indicators, and can also be combined with situational effects to form tiles with luminous effects for outdoor situation lighting.

The following table shows an embodiment of the parameters of the light-emitting element 100 of the present embodiment, but it is only for illustrative purposes and is not intended to limit the scope of the present invention.

Table 1 lists the three sets of parameters of the light-emitting element 100, wherein the row of electrodes indicates that the anode 150 and the cathode 160 are made of fluorine-doped tin oxide (FTO). The line of gas indicates that the material used for the low pressure gas 122 is neon (Ne). The line of pressure indicates the pressure of the low pressure gas. The Vpp (volt) line represents the voltage difference from the peak to the valley of the voltage signal generated by the power supply 170 in volts. The Offset (V _dc ) line indicates the offset of the AC signal generated by the power supply 170, that is, the DC portion of the AC signal. The Freq (Hz) line indicates the frequency of the AC signal generated by the power supply 170 in Hertz (Hz). The Duty line indicates the duty of the voltage signal generated by the power source 170. In addition, the three columns of data in Table 1 represent the parameters of the three sets of light-emitting elements 100, respectively.

4A to 4D are diagrams of other four driving voltage waveforms for driving the light-emitting element of Fig. 2. Referring to FIG. 2 and FIG. 4A to FIG. 4D, the power source 170 can also provide a pulse voltage to the anode 150 and the cathode 160. For example, the pulse voltage signal of FIG. 4A or FIG. 4C can be supplied to the cathode 160, and the anode 150 is grounded. The main difference between the signals of FIG. 4A and FIG. 4C is that the DC portion of the signal of FIG. 4A is negative. The DC portion of the signal of Figure 4C is zero. Alternatively, the pulse voltage signal of FIG. 4B or FIG. 4D may be supplied to the anode 150, and the cathode 160 is grounded. The main difference between the signals of FIG. 4B and FIG. 4D is that the DC portion of the signal of FIG. 4B is positive, and the figure is The DC portion of the 4D signal is zero. The pulse voltage can also dissociate the low pressure gas 122 to produce a plurality of electrons 180, and the electrons 180 strike the phosphor layer 140 under the action of a pulse voltage to cause the phosphor layer 140 to emit light.

5A is a cross-sectional view of a light-emitting element according to another embodiment of the present invention, and FIG. 5B is a front view of the light-emitting element of FIG. 5A, wherein FIG. 5A is a cross-sectional view taken along line I-I of FIG. 5B. Referring to FIGS. 5A and 5B, the light-emitting element 100a of the present embodiment is similar to the light-emitting element 100 of FIG. 2, and the same reference numerals are used for the same or similar elements, and the differences between the two are as follows. In the light-emitting element 100a of the present embodiment, the sealing structure 116 has a first side 116a and a second side 116b opposite to each other. The first side 116a is located between the anode 150 and the sealed space 120, and the second side is 116b is located between the enclosed space 120 and the cathode 160. In other words, the anode 150 and the cathode 160 are located on the side of the light-emitting element 100a. In contrast, the cathode 150 and the cathode 160 of FIG. 2 are located on the upper and lower sides of the light-emitting element 100, that is, on the two light-emitting surfaces. Therefore, in the present embodiment, in addition to the transparent conductive layer, the anode 150 and the cathode 160 may also employ an opaque metal electrode or a carbon nanotube electrode, without regard to the problem of shading.

In this embodiment, the sealing structure 116 further has a third side 116c and a fourth side 116d. The third side 116c connects the first side 116a and the second side 116b, and the fourth side 116d connects the first side 116a and the second side 116b. In other words, the sealing structure 116 is, for example, a rectangular frame. In other embodiments, the anode 150 and the cathode 160 may also be disposed beside the third side 116c and the fourth side 116d of the sealing structure 116, respectively.

An example of the various parameters of the light-emitting element 100a of the present embodiment is shown in the following Table 2, but is for illustrative purposes only and is not intended to limit the scope of the present invention.

Table 2 cites two sets of light-emitting elements 100a, and the physical meanings of the values in Table 2 are as described in Table 1, and will not be repeated here.

6A is a schematic cross-sectional view of a light-emitting element according to still another embodiment of the present invention, wherein FIG. 6B is a cross-sectional view of the light-emitting element of FIG. 6A at night, and FIG. 6C is a front view of the light-emitting element of FIG. 6A. Referring to FIGS. 6A to 6C, the light-emitting element 100b of the present embodiment is similar to the light-emitting element 100 of FIG. 2, and the same reference numerals are used for the same or similar elements, and the differences between the two are as follows. The light emitting device 100b of the embodiment further includes a solar module 192, and the first side 116a of the sealing structure 116 is located between the solar module 192 and the sealed space 120. In this embodiment, the solar module 192 is disposed at the side of the first side 116a, the second side 116b, the third side 116c, and the fourth side 116d of the sealing structure 116, that is, the solar module 192 is sealed. Structure 116. However, in other embodiments, the solar module 192 may also be disposed on one, two, or three of the first side 116a, the second side 116b, the third side 116c, and the fourth side 116d. Next. The solar module 192 is, for example, a twinned solar cell, a microcrystalline solar cell, a germanium thin film solar cell, a three-five solar cell, a copper indium diselenide (CIS) solar cell, or a copper indium gallium diselenide (copper indium gallium diselenide). CIGS) Solar cells, cadmium telluride (CdTe) solar cells, multi-junction solar cells, organic polymer solar cells or dye-sensitized cells.

In addition, in the present embodiment, the light-emitting element 100b further includes an infrared light reflecting film 118 disposed on the first substrate 112 or the second substrate 114, and is disposed on the first substrate 112 in FIGS. 6A and 6B. example. The infrared light reflecting film 118 is, for example, an optical multilayer film, a film layer having a surface microstructure, or a chemical paint to achieve an infrared light reflecting effect.

When the light-emitting element 100b is used in place of the vacuum glass for daylight use, the power source 170 can be turned off without the light-emitting element 100b emitting light. At this time, the outdoor natural light (including the infrared light 54 and the visible light 52) will sequentially pass through the cathode 160 and the second. The substrate 114 is transferred to the light emitting layer 140 with the low pressure gas 122. The phosphor layer 140 scatters part of the infrared light 54 and part of the visible light 52, and scatters part of the infrared light 54 and part of the visible light 52 to the solar module 192. Another portion of the visible light 52 will penetrate the phosphor layer 140 and continue to penetrate the first substrate 112 and the anode 150 for delivery to the chamber. In this way, the indoor user can utilize the outdoor natural light and can also see the outdoor scenery through the light-emitting element 100b. When the infrared light reflecting film 118 is disposed on the first substrate 112, the visible light 52 still penetrates the infrared light reflecting film 118 and reaches the room. In addition, when the infrared light reflecting film 118 is disposed on the first substrate 112, the infrared light 54 from the outdoor is reflected by the infrared light reflecting film 118 and transmitted to the second substrate 112 and the second substrate 114 through the reflection function. Solar module 192. In this way, the infrared light 54 does not enter the room, and the effect of strengthening the heat insulation is achieved.

After the solar module 192 receives the energy of the visible light 52 and the infrared light 54, the power is generated, and a battery 194 electrically connected to the solar module 192 can be used to store the power of the solar module 192.

When the light-emitting element 100b is used at night instead of the vacuum glass, the power source 170 can be turned on to cause the light-emitting element 100b to emit light. At this time, the fluorescent layer 140 emits light 142 (for example, visible light) after being struck by the electrons 180. The light 142 can be transmitted to the room via the first substrate 112 or to the outside through the second substrate 114, and the partial light 142 can also be reflected by the first substrate 112 and the second substrate 114 and the scattering effect of the fluorescent layer 140. The solar module 192 is passed to the solar module 192 to enable the solar module 192 to recover the energy of the unutilized light 142.

Therefore, the light-emitting element 100b can absorb and store the energy of the natural light during the day as one of the energy sources for the light-emitting element 100b to emit light at night. Further, even when the light-emitting element 100b emits light at night, light 142 that is not transmitted to the outside of the light-emitting element 100b can be recovered. Therefore, the light-emitting element 100b of the present embodiment can effectively achieve the effect of energy saving.

Fig. 7 is a front elevational view showing a light-emitting element according to still another embodiment of the present invention. Referring to FIG. 7, the light-emitting element 100c of the present embodiment is similar to the light-emitting element 100a of FIG. 5B and the light-emitting element 100b of FIG. 6A, and the same reference numerals are used for the same or similar elements, and the differences of the three are as follows. The light-emitting element 100c of the present embodiment employs the anode 150 and the cathode 160 disposed on both sides of the light-emitting element 100a of FIG. 5B, and the solar module 192 is disposed on the other two sides of the light-emitting element 100a. Specifically, the anode 150 and the cathode 160 are respectively disposed beside the first side 116a and the second side 116b of the sealing structure 116, and the solar module 192 is disposed on the third side 116c and the fourth side of the sealing structure 116. Next to the side 116d. However, in other embodiments, the solar module 192 may also be disposed only beside the third side 116c or the fourth side 116d.

Figure 8 is a cross-sectional view showing a light-emitting element according to another embodiment of the present invention. Referring to FIG. 8, the light-emitting element 100d of the present embodiment is similar to the light-emitting element 100 of FIG. 2, and the same reference numerals are used for the same or similar elements, and the differences between the two are as follows. The process of the light-emitting element 100d of the present embodiment can be improved from the process of vacuum glass, and the process of the present embodiment increases the formation of the anode 150, the cathode 160 and the phosphor layer 140 compared to the process of vacuum glass. In this embodiment, the light-emitting element 100d further includes a plurality of spacers 195 disposed between the first substrate 112 and the second substrate 114 to maintain the gap between the first substrate 112 and the second substrate 114. Distance and absorb stress. Further, one side of the light-emitting element 100d may be attached with a thick glass 60 to increase the strength of the overall structure.

Fig. 9 is a cross-sectional view showing a light-emitting element according to another embodiment of the present invention. Referring to FIG. 9, the light-emitting element 100e of the present embodiment is similar to the light-emitting element 100a of FIG. 5A and the light-emitting element 100d of FIG. 8. The same reference numerals in the three are the same or similar elements, and the differences between the three are as follows. . The light-emitting element 100e of the present embodiment is a process in which the electrodes disposed on both sides of the light-emitting element 100a of FIG. 5A and the modified self-vacuum glass process of FIG. Specifically, in the present embodiment, the anode 150 and the cathode 160 are disposed on both sides of the sealing structure 116, and a thick glass 60 is attached to one side of the light-emitting element 100e.

Figure 10 is a schematic illustration of a display device in accordance with one embodiment of the present invention. Referring to FIG. 10, the display device 200 of the present embodiment includes a plurality of the above-mentioned light-emitting elements 100, wherein the light-emitting elements 100 are arranged in an array. In other embodiments, the display device 200 may also include a plurality of the above-mentioned light-emitting elements 100a, 100b, 100c, 100d or 100e. In the present embodiment, the light-emitting elements 100 are taken as an example for illustration. The light-emitting elements 100 are arranged, for example, in a two-dimensional array. Thus, when the light-emitting element 100 is used as a glass curtain of a building, each of the light-emitting elements 100 can serve as a pixel, and the light-emitting elements 100 form a large display. wall. In particular, these light-emitting elements 100 can form a dynamic or static display by emitting or not emitting light, emitting light of different brightness, or emitting light of different colors. Further, when the size of these light-emitting elements 100 is made small, these light-emitting elements 100 can also constitute a smaller display.

In the embodiment, the display device 200 further includes a plurality of first signal lines 220, a plurality of second signal lines 210, a row driving circuit 240, and a column driving circuit 230. Each of the first signal lines 220 is electrically connected to the anodes 150 of the light-emitting elements 100 of one row (as shown in FIG. 2 ), and each of the second signal lines 210 is electrically connected to the cathodes of the columns of the light-emitting elements 100 . 160 (as shown in Figure 2). The row driving circuit 240 is electrically connected to the first signal lines 220, wherein the row driving circuit 240 is configured to selectively drive the first signal lines 220. The column driving circuit 230 is electrically connected to the second signal lines 210, wherein the column driving circuit 230 is configured to selectively drive the second signal lines 210. For example, when the row driving circuit 240 turns on the first and second first signal lines 220 on the right side of FIG. 10, and when the column driving circuit 230 turns the second signal line 210 in the middle of FIG. When turned on, the two light-emitting elements 100, which are diagonally drawn in Fig. 10, emit light. In addition, the row driving circuit 240 and the column driving circuit 230 can be electrically connected to a control unit 250. The control unit 250 can determine, according to the program or the pre-programmed data, how to drive the light-emitting elements 100 by the row driving circuit 240 and the column driving circuit 230, thereby forming the light-emitting elements 100 into a program or a burned material. Static or dynamic picture.

Figure 11 is a schematic illustration of a display device in accordance with another embodiment of the present invention. Referring to FIG. 11, the display device 200a of the present embodiment is similar to the display device 200 of FIG. 10, wherein the same reference numerals denote the same or similar elements, and the differences between the two are as follows. The display device 200a of the present embodiment includes a plurality of driving circuits (the driving circuit may include an anode signal line 210a and a cathode signal line 220a) electrically connected to the light emitting elements 100 to drive the light emitting elements 100 respectively. For example, the anode signal line 210a is electrically connected to the anode 150 of the light emitting element 100 (as shown in FIG. 2), and the cathode signal line 220a is electrically connected to the cathode 160 of the light emitting element 100 (as shown in FIG. 2). . When a voltage is applied to the anode signal line 210a and the cathode signal line 220a connected to the same light-emitting element 100, the light-emitting element 100 can be driven to emit light. For example, the anode signal line 210a and the cathode signal line 220a connected to the two light-emitting elements 100 shown obliquely in FIG. 11 are both turned on, so that the two light-emitting elements 100 can emit light.

In other embodiments, the display device 200a may also include a plurality of the above-described light emitting elements 100a, 100b, 100c, 100d or 100e.

In summary, in the light-emitting element of the embodiment of the present invention, since the anode and the cathode are located outside the sealed container, the anode and the cathode can be effectively prevented from being damaged by the impact of ions or electrons, so the service life of the light-emitting element Can be effectively extended. In addition, compared with the conventional gas discharge light source, the light-emitting element of the embodiment of the present invention does not need to generate light through two processes, so the luminous efficiency is high, and the energy loss can also be reduced. In addition, compared with the conventional field emission light source, the light-emitting element of the embodiment of the present invention is filled with a thin gas, so that an ultra-high vacuum environment is not required, so that the difficulty encountered in ultra-high vacuum packaging can be avoided. Furthermore, in the light-emitting element of the embodiment of the present invention, uniform light emission can be easily achieved by uniformly coating the phosphor layer, and the process is relatively simple. In addition, the light-emitting element of the embodiment of the present invention has a simple structure, and therefore the process is relatively simple.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

52. . . Visible light

54. . . Infrared light

60. . . Thick glass

100, 100a, 100b, 100c, 100d, 100e. . . Light-emitting element

110. . . sealed container

112. . . First substrate

114. . . Second substrate

116. . . Sealing structure

116a. . . First side

116b. . . Second side

116c. . . Third side

116d. . . Fourth side

118. . . Infrared light reflecting film

120. . . hermetic space

122. . . Low pressure gas

130. . . Gas ion

140. . . Fluorescent layer

142. . . Light

150. . . anode

160. . . cathode

170. . . power supply

180. . . electronic

192. . . Solar module

194. . . Battery

195. . . Spacer

200, 200a. . . Display device

210. . . Second signal line

210a. . . Anode signal line

220. . . First signal line

220a. . . Cathode signal line

230. . . Column drive circuit

240. . . Row driver circuit

250. . . control unit

1 is a view showing a comparison of a light-emitting mechanism of a conventional light-emitting structure and a light-emitting element of the present invention.

2 is a schematic cross-sectional view showing a light-emitting element according to an embodiment of the present invention.

3A to 3C are waveform diagrams of driving voltages for driving the light-emitting elements of Fig. 2.

4A to 4D are diagrams of other four driving voltage waveforms for driving the light-emitting element of Fig. 2.

Fig. 5A is a cross-sectional view showing a light-emitting element according to another embodiment of the present invention.

Fig. 5B is a front elevational view of the light emitting element of Fig. 5A.

Fig. 6A is a schematic cross-sectional view showing a light-emitting element according to still another embodiment of the present invention when it is used during the day.

6B is a schematic cross-sectional view of the light-emitting element of FIG. 6A when it is used at night.

Fig. 6C is a front elevational view of the light-emitting element of Fig. 6A.

Fig. 7 is a front elevational view showing a light-emitting element according to still another embodiment of the present invention.

Figure 8 is a cross-sectional view showing a light-emitting element according to another embodiment of the present invention.

Fig. 9 is a cross-sectional view showing a light-emitting element according to another embodiment of the present invention.

Figure 10 is a schematic illustration of a display device in accordance with one embodiment of the present invention.

Figure 11 is a schematic illustration of a display device in accordance with another embodiment of the present invention.

100. . . Light-emitting element

110. . . sealed container

112. . . First substrate

114. . . Second substrate

116. . . Sealing structure

120. . . hermetic space

122. . . Low pressure gas

130. . . Gas ion

140. . . Fluorescent layer

142. . . Light

150. . . anode

160. . . cathode

170. . . power supply

180. . . electronic

Claims (27)

A light-emitting element comprising: a sealed container defining a sealed space, wherein the sealed space is located inside the sealed container; a low-pressure gas is filled in the sealed space; an anode is disposed outside the sealed container; a cathode And disposed outside the sealed container, wherein the anode and the cathode are respectively located on opposite sides of the sealed space; and a fluorescent layer disposed in the sealed space. The light-emitting element of claim 1, wherein the sealed container comprises: a first substrate; a second substrate opposite to the first substrate; and a sealing structure disposed on the first substrate and the first substrate An edge of the second substrate, wherein the first substrate, the second substrate, and the sealing structure surround the sealed space. The light-emitting device of claim 2, wherein the first substrate is disposed between the anode and the second substrate, and the second substrate is disposed between the first substrate and the cathode. The light-emitting element of claim 2, wherein the sealing structure has a first side and a second side, the first side being located between the anode and the sealed space, and the first The two sides are located between the sealed space and the cathode. The illuminating device of claim 2, further comprising a solar module, wherein the sealing structure has a first side and a second side, and the first side is located at the solar module Between this confined space. The illuminating element of claim 5, wherein the sealing structure further has an opposite third side and a fourth side, the third side connecting the first side and the second side The fourth side edge is connected to the first side edge and the second side edge, and the solar module is disposed in the first side edge, the second side edge, the third side edge, and the fourth side edge At least two of them. The light-emitting component of claim 5, further comprising a battery electrically connected to the solar module to store power of the solar module. The light-emitting element according to claim 5, wherein the solar module is a twinned solar cell, a microcrystalline solar cell, a germanium thin film solar cell, a three-five solar cell, a copper indium selenium solar cell, and a copper indium gallium selenide. Solar cells, cadmium telluride solar cells, multi-junction solar cells, organic polymer solar cells or dye-sensitized cells. The illuminating element of claim 2, further comprising an infrared light reflecting film disposed on the first substrate or the second substrate. The light-emitting element according to claim 2, further comprising a plurality of spacers dispersedly disposed between the first substrate and the second substrate. The illuminating element of claim 1, further comprising a power source electrically connected to the anode and the cathode to provide an alternating voltage or a pulse voltage, wherein the alternating voltage or the pulse voltage is adapted to dissociate the low pressure gas A plurality of electrons are generated, and the electrons strike the phosphor layer under the action of the alternating voltage or the pulse voltage to cause the phosphor layer to emit light. The light-emitting element according to claim 1, wherein the pressure of the low-pressure gas is between 5 × 10 ^-1 Torr and 1 × 10 ^-3 Torr. The light-emitting element of claim 1, wherein the low-pressure gas comprises air, helium, neon, argon, helium, neon, hydrogen, carbon dioxide, oxygen or a combination thereof. The light-emitting element of claim 1, wherein at least one of the anode and the cathode is a transparent conductive layer. The light-emitting element according to claim 14, wherein the transparent conductive layer is made of indium tin oxide, fluorine-doped tin oxide, aluminum-doped tin oxide or gallium-doped zinc oxide. The light-emitting element according to claim 1, wherein at least one of the anode and the cathode is made of a metal or a carbon nanotube. The illuminating element of claim 1, wherein the luminescent layer is adapted to emit visible light after being struck by electrons. A display device comprising: a plurality of light-emitting elements arranged in an array, wherein each of the light-emitting elements comprises: a closed container defining a sealed space, wherein the sealed space is located inside the sealed container; and a low-pressure gas is filled in In the sealed space, an anode is disposed outside the sealed container; a cathode is disposed outside the sealed container, wherein the anode and the cathode are respectively located on opposite sides of the sealed space; and a fluorescent layer is disposed on In the confined space. The display device of claim 18, further comprising a plurality of driving circuits electrically connected to the light emitting elements to drive the light emitting elements separately. The display device of claim 18, further comprising: a plurality of first signal lines, wherein each of the first signal lines is electrically connected to the anodes of the light-emitting elements of a row; a signal line, wherein each of the second signal lines is electrically connected to the cathodes of the light-emitting elements of a column; a driving circuit is electrically connected to the first signal lines, wherein the row driving circuit is used for selective Driving the first signal lines; and a column of driving circuits electrically connected to the second signal lines, wherein the column driving circuit is configured to selectively drive the second signal lines. The display device of claim 18, wherein the sealed container comprises: a first substrate; a second substrate opposite to the first substrate; and a sealing structure disposed on the first substrate and the first An edge of the second substrate, wherein the first substrate, the second substrate, and the sealing structure surround the sealed space. The display device of claim 21, wherein the first substrate is disposed between the anode and the second substrate, and the second substrate is disposed between the first substrate and the cathode. The display device of claim 21, wherein the sealing structure has a first side and a second side, the first side being located between the anode and the sealed space, and the first The two sides are located between the sealed space and the cathode. The display device of claim 21, wherein each of the light-emitting elements further comprises a solar module, the sealing structure having a first side and a second side, and the first side Located between the solar module and the enclosed space. The display device of claim 24, wherein the sealing structure further has an opposite third side and a fourth side, the third side connecting the first side and the second side The fourth side edge is connected to the first side edge and the second side edge, and the solar module is disposed in the first side edge, the second side edge, the third side edge, and the fourth side edge At least two of them. The display device of claim 21, wherein each of the light-emitting elements further comprises an infrared light reflecting film disposed on the first substrate or the second substrate. The display device of claim 21, wherein each of the light-emitting elements further comprises a plurality of spacers dispersedly disposed between the first substrate and the second substrate.