CN110554544B

CN110554544B - Micro-switch electronic writing board

Info

Publication number: CN110554544B
Application number: CN201810555008.2A
Authority: CN
Inventors: 王富民
Original assignee: Shanli Technology Co ltd
Current assignee: Shanli Technology Co ltd
Priority date: 2018-06-01
Filing date: 2018-06-01
Publication date: 2023-04-14
Anticipated expiration: 2038-06-01
Also published as: CN110554544A

Abstract

The invention discloses a micro-switch electronic writing board, which comprises a micro-switch array module and a cholesterol liquid crystal module. The micro-switch array module is provided with a plurality of micro-switch units, and the transparent conducting layer of each micro-switch unit is arranged on the surface of the first light-transmitting substrate, which is back to the light incident surface. The first transparent electrode layer is disposed on the first surface of the second transparent substrate and extends to the second surface of the second transparent substrate through the conductive hole. A second transparent electrode layer is arranged on one surface of the first substrate of the first cholesterol liquid crystal module. The micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second transparent substrate, so that the first cholesterol liquid crystal layer is arranged between the first substrate and the second transparent substrate. The microswitch electronic writing board has the advantages of simple and convenient manufacturing process and low manufacturing cost, and simultaneously has the function of detecting the writing position or the wiping position.

Description

Micro-switch electronic writing board

Technical Field

The invention relates to a microswitch electronic writing board, in particular to a microswitch electronic writing board capable of detecting writing or wiping positions.

Background

Cholesteric liquid crystals (Cholesteric liquid crystals) are obtained by adding a chiral dopant (chiral dopant) to nematic liquid crystals to form a helical arrangement structure, and by using two different liquid crystal molecule arrangement states of reflection and penetration under different voltage differences, different light transmittance is achieved, and a display effect is achieved. Wherein, in the planar state, the incident light is reflected to develop color; while in the focal conic state, most incident light penetrates and a small part of incident light is scattered; in the vertical state, the incident light is completely transmitted.

Because the cholesteric liquid crystal is in a stable state in both a planar state and a focal conic state, when the voltage is turned off and disappears, the cholesteric liquid crystal can still be maintained in the original state and display picture, and only when the cholesteric liquid crystal is changed into the other state and display picture, the voltage is applied, so that the cholesteric liquid crystal has the characteristics of low power consumption and memorability, and the cholesteric liquid crystal also becomes the first choice of an electronic book. Meanwhile, the display mechanism is less affected by the distance between the upper plate and the lower plate, and has the potential and application of developing a bistable flexible display. Compared with other types, such as TN lcd, the cholesteric lcd has the advantages of power saving, color display, dimming, and application to bistable flexible display, and is very widely applied.

At present, most of the cholesterol liquid crystal writing boards are pressed by physical force to perform state transition. However, when the cholesteric liquid crystal writing board is used to detect the writing position or perform local wiping, a corresponding position sensing element needs to be additionally disposed on the array substrate of the liquid crystal module. However, since the position sensing device is disposed on the array substrate, a very large number of semiconductor mask manufacturing processes are required. That is, in the current cholesteric liquid crystal writing board with position detection function, the structure of the element responsible for position sensing is relatively complex, so the manufacturing cost is relatively increased. Also, the yield is low due to the additional semiconductor manufacturing process steps.

In view of the above, it is an important subject to provide a cholesterol liquid crystal writing board which eliminates the semiconductor manufacturing process to reduce the manufacturing cost and has the function of detecting the writing position or the wiping position.

Disclosure of Invention

The invention aims to provide a microswitch electronic writing board which has the effects of simple structure and low cost and also has the function of detecting a writing position or a wiping position.

The invention provides a micro-switch electronic writing board, which comprises a micro-switch array module and a cholesterol liquid crystal module. The micro-switch array module is provided with a plurality of micro-switch units which are arranged in an array, and each micro-switch unit comprises a first light-transmitting substrate, a transparent conducting layer, a second light-transmitting substrate, a first transparent electrode layer and at least one spacer. The first transparent substrate has a light incident surface. The transparent conductive layer is arranged on the surface of the first light-transmitting substrate, which is back to the light incident surface. The second transparent substrate has a first surface facing the transparent conductive layer and a second surface opposite to the first surface, and the second transparent substrate has a conductive hole penetrating through the first surface and the second surface. The first transparent electrode layer is disposed on the first surface of the second transparent substrate and extends to the second surface of the second transparent substrate through the conductive hole. The spacer is arranged between the first light-transmitting substrate and the second light-transmitting substrate. The first cholesteric liquid crystal module comprises a first substrate and a first cholesteric liquid crystal layer. A second transparent electrode layer is arranged on one surface of the first substrate. The first cholesterol liquid crystal layer is arranged on the second transparent electrode layer. The micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second transparent substrate, so that the first cholesterol liquid crystal layer is arranged between the first substrate and the second transparent substrate.

In an embodiment, a third transparent electrode layer is disposed on the other surface of the first substrate of the first cholesteric liquid crystal module.

In one embodiment, the third transparent electrode layer is electrically connected to the first transparent electrode layer.

In one embodiment, the micro-switch electronic writing board further includes a second cholesteric liquid crystal module including a second substrate and a second cholesteric liquid crystal layer. A fourth transparent electrode layer is disposed on a surface of the second substrate. The second cholesterol liquid crystal layer is arranged on the fourth transparent electrode layer; the second cholesteric liquid crystal module is mutually overlapped with the first cholesteric liquid crystal module through the first substrate, so that the second cholesteric liquid crystal layer is arranged between the first substrate and the second substrate.

In one embodiment, the micro-switch electronic writing board further includes a second cholesteric liquid crystal module including a second substrate, a second cholesteric liquid crystal layer, and a third transparent substrate. A fourth transparent electrode layer is disposed on a surface of the second substrate. The second cholesterol liquid crystal layer is arranged on the fourth transparent electrode layer. The third transparent substrate is arranged on the second cholesterol liquid crystal layer, and a fifth transparent electrode layer which is arranged at an interval is arranged on one surface of the third transparent substrate facing the second cholesterol liquid crystal layer, wherein the second cholesterol liquid crystal module is mutually overlapped with the first cholesterol liquid crystal module through the first substrate and the third transparent substrate.

In one embodiment, the fifth transparent electrode layer is electrically connected to the first transparent electrode layer.

In one embodiment, the first transparent substrate, the second transparent substrate, or the first substrate is made of plastic or glass.

In one embodiment, the material of the second substrate is plastic or glass.

In one embodiment, the material of the second substrate or the third transparent substrate is plastic or glass.

In one embodiment, the first transparent substrate is a glass substrate, and the thickness of the glass substrate is between 0.1mm and 0.35 mm.

In an embodiment, the material of the transparent conductive layer, the first transparent electrode layer, or the second transparent electrode layer is a transparent conductive material or graphene.

In an embodiment, a material of the third transparent electrode layer or the fourth transparent electrode layer is a transparent conductive material or graphene.

In an embodiment, the material of the third transparent electrode layer, the fourth transparent electrode layer, or the fifth transparent electrode layer is a transparent conductive material or graphene.

In one embodiment, the micro-switch electronic writing board further includes a voltage control circuit electrically connected to the transparent conductive layer and the second transparent electrode layer, respectively.

In one embodiment, the micro-switch electronic writing board further includes a voltage control circuit electrically connected to the transparent conductive layer, the second transparent electrode layer and the fourth transparent electrode layer, respectively.

As mentioned above, the micro-switch electronic writing board of the present invention includes a micro-switch array module and a cholesteric liquid crystal module. The micro-switch array module is provided with a plurality of micro-switch units arranged in an array manner, a transparent conducting layer of each micro-switch unit is arranged on the surface of the first light-transmitting substrate, which is opposite to the light incident surface, and a first transparent electrode layer is arranged on the first surface of the second light-transmitting substrate and extends to the second surface of the second light-transmitting substrate through the conducting hole; the micro-switch array module is mutually overlapped with the cholesterol liquid crystal module through the second transparent substrate, so that the cholesterol liquid crystal layer is arranged between the first substrate and the second transparent substrate. Therefore, the structure of the micro switch array module and the cholesterol liquid crystal module is quite simple, and the manufacturing cost is not high; the micro-switch array module and the cholesterol liquid crystal module are overlapped to form the micro-switch electronic writing board with the function of detecting the writing position or wiping the position, and the working procedure is quite simple and convenient. Therefore, the microswitch electronic writing board has the effects of simple manufacturing process and low manufacturing cost, and simultaneously has the function of detecting the writing position or the wiping position.

Drawings

Fig. 1 is a schematic view of an application of a micro-switch electronic writing board according to an embodiment of the invention.

Fig. 2 is a partially exploded perspective view of an embodiment of the micro-switch electronic tablet of the present invention.

Fig. 3A isbase:Sub>A cross-sectional exploded view of one embodiment of the micro-switch electronic tablet of fig. 2 taken along linebase:Sub>A-base:Sub>A.

Fig. 3B is a schematic structural view of the microswitch electronic writing board shown in fig. 3A after being assembled and pressed.

Fig. 3C is a schematic structural view of the micro-switch electronic writing board shown in fig. 3A or 3B, which is provided with a back plate.

Fig. 4A and 4B are schematic structural views of another embodiment of the micro-switch electronic writing board provided in the present invention.

Fig. 5A and 5B are schematic structural views of another embodiment of the micro-switch electronic writing board provided by the present invention.

Detailed Description

The micro-switch electronic tablet according to various embodiments of the present invention will be described with reference to the accompanying drawings, wherein like elements are described with like reference numerals.

It should be noted that all directional indicators (such as up, down, left, right, front, back, 8230) \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator will be correspondingly changed.

The micro-switch electronic writing board in the following embodiments is an example of a large-sized electronic blackboard (or whiteboard) applied to an interactive writing system such as a conference or teaching, but the invention is not limited thereto. The micro-switch electronic writing board provided by each embodiment of the invention utilizes the characteristic of the cholesterol liquid crystal, so that the micro-switch electronic writing board is a bistable display device, when the micro-switch electronic writing board displays images or pictures, no additional power supply is needed to be input, the images or pictures can be kept all the time, and the additional power supply is needed to be input only when the micro-switch electronic writing board is changed into another state or displays the pictures, so that the micro-switch electronic writing board is a quite power-saving electronic device.

The micro-switch electronic writing board provided by the following embodiments of the invention utilizes the characteristics of the cholesterol liquid crystal, and therefore, the micro-switch electronic writing board is a bistable display device, when the micro-switch electronic writing board displays images or pictures, no additional power supply is needed to be input, the images or pictures can be kept all the time, and the additional power supply is only needed to be input when the micro-switch electronic writing board is changed into another state or displays the pictures, so that the micro-switch electronic writing board is an electronic device with low cost and electricity saving.

Fig. 1 is a schematic view of an application of a micro-switch electronic writing board according to an embodiment of the invention. Fig. 2 isbase:Sub>A partially exploded perspective view ofbase:Sub>A microswitch electronic tablet according to an embodiment of the present invention, fig. 3A isbase:Sub>A cross-sectional exploded view of the microswitch electronic tablet shown in fig. 2 along linebase:Sub>A-base:Sub>A, and fig. 3B isbase:Sub>A structural view of the microswitch electronic tablet shown in fig. 3A after being assembled and pressed. The micro-switch electronic writing board of the present invention can be, but is not limited to, a mobile phone, a tablet, an electronic whiteboard, or other display devices capable of displaying images. As shown in fig. 1, the micro-switch electronic writing board E of the present embodiment is a large-sized electronic blackboard (or whiteboard) applied to a conference or a teaching system, but the present invention is not limited thereto. It should be noted that, for convenience of description, the microswitch electronic writing board E of the following embodiments has different compositions according to the embodiments. The micro-switch electronic tablet E of fig. 1 shows a writing trace T on its light incident surface 111.

As shown in fig. 2, the micro-switch electronic writing board E of the present embodiment includes a micro-switch array module 1 and a first cholesteric liquid crystal module 2. The micro-switch array module 1 has a plurality of micro-switch units 10 arranged in a two-dimensional array, but the present invention is not limited to the two-dimensional array.

As shown in fig. 3A, each micro switch unit 10 includes a first transparent substrate 11, a transparent conductive layer 12, a second transparent substrate 13, a first transparent electrode layer 14 and at least one spacer 15.

The first transparent substrate 11 has a light incident surface 111. The light incident surface 111 of the present embodiment is the upper surface of the first transparent substrate 11, which is also the surface of the micro-switch electronic writing board E facing the user, and may also be referred to as a writing surface or a display surface, on which the user can write to generate the writing trace T. Note that, the user can write (press) directly on the light incident surface (writing surface) 111 to generate the writing locus T; alternatively, the light incident surface 111 may be provided with another film layer on which a user can write (press) to generate the writing trace T. In some embodiments, a protective film or a protective substrate may be further disposed on the light incident surface 111 to protect the micro-switch electronic writing board E.

In each of the micro-switch cells 10, the transparent conductive layer 12 is disposed on the surface 112 of the first light-transmitting substrate 11 facing away from the light incident surface 111. Here, the surface 112 is the other surface of the first transparent substrate 11. The second transparent substrate 13 has a first surface 131 facing the transparent conductive layer 12 and a second surface 132 opposite to the first surface 131, and the second transparent substrate 13 has a conductive hole 133 penetrating through the first surface 131 and the second surface 132. As the name implies, the conductive vias 133 are used for electrical conduction. In the present embodiment, if the second transparent substrate 13 is made of glass, a laser can be used to open a hole on the second transparent substrate 13, and if the second transparent substrate 13 is made of plastic, an etching process can be used to open a hole to obtain the conductive hole 133 penetrating through the first surface 131 and the second surface 132. The first transparent electrode layer 14 is disposed on the first surface 131 of the second transparent substrate 13 and extends to the second surface 132 of the second transparent substrate 13 through the conductive hole 133, so as to form the first transparent electrode layers 14 disposed at intervals on the second surface 132. In each of the micro-switch cells 10, the transparent conductive layer 12, the conductive hole 133, and the first transparent electrode layer 14 correspond to each other in a one-to-one manner. In addition, at least one spacer 15 is disposed between the first transparent substrate 11 and the second transparent substrate 13, so that a gap is formed between the first transparent substrate 11 and the second transparent substrate 13, and further a gap is formed between the transparent conductive layer 12 and the first transparent electrode layer 14 on the first surface 131 of the second transparent substrate 13. Specifically, the spacer 15 of the present embodiment is disposed around the micro-switch unit 10, so that a gap is formed between the transparent conductive layer 12 and the first transparent electrode layer 14, thereby forming the micro-switch unit 10. In various embodiments, the spacer 15 may also be disposed inside the transparent conductive layer 12 and the first transparent electrode layer 14.

As shown in fig. 3A, the first cholesteric liquid crystal module 2 includes a first substrate 21, a second transparent electrode layer 22 and a first cholesteric liquid crystal layer 23. The second transparent electrode layer 22 is disposed on a surface of the first substrate 21 facing the first cholesterol liquid crystal layer 23. Herein, the second transparent electrode layer 22 can be disposed on the surface 211 of the first substrate 21 facing the first cholesteric liquid crystal layer 23, and the first cholesteric liquid crystal layer 23 is disposed on the second transparent electrode layer 22 and between the second transparent electrode layer 22 and the first transparent electrode layer 14. The term "globally" means that the second transparent electrode layer 22 includes a whole surface of a common electrode, and the common electrode covers most of the surface of the first substrate 21 facing the first cholesteric liquid crystal layer 23. In various embodiments, the second transparent electrode layers 22 may be disposed on the surface of the first substrate 21 facing the first cholesteric liquid crystal layer 23 at intervals, which is not limited in the present invention.

As shown in fig. 3B, the micro switch array module 1 of the present embodiment is stacked with the first cholesteric liquid crystal module 2 through the second transparent substrate 13, so that the first cholesteric liquid crystal layer 23 is interposed between the first substrate 21 and the second transparent substrate 13. In some embodiments, the micro switch array module 1 and the first cholesteric liquid crystal module 2 can be adhered by an adhesive material to enhance the structural stability. When the transparent conductive layer 12 is pressed down to the first transparent electrode layer 14 and contacts the first transparent electrode layer 14, the micro-switch unit 10 is turned on, and the electrical signal is transmitted to the first transparent electrode layer 14 through the transparent conductive layer 12 of the micro-switch unit 10, and then transmitted to the first transparent electrode layer 14 on the second surface 132 of the second transparent substrate 13 through the conductive hole 133.

In fig. 3B, the second transparent substrate 13 is disposed opposite to the first substrate 21. The first cholesteric liquid crystal layer 23 has a plurality of cholesteric liquid crystal molecules (not shown), which can be filled and disposed between the second transparent substrate 13 and the first substrate 21. In addition, the micro-switch electronic writing board E may further include a sealing layer (not shown), which may be a sealant and is disposed between the second transparent substrate 13 and the first substrate 21 to seal the outer peripheries of the second transparent substrate 13 and the first substrate 21, so that a gap is formed between the second transparent substrate 13 and the first substrate 21. A containing space can be formed by the second transparent substrate 13, the first substrate 21 and the sealing layer, so that the cholesteric liquid crystal molecules can be filled in the containing space to form a first cholesteric liquid crystal layer 23. The first cholesteric liquid crystal layer 23 of the present embodiment includes a plurality of liquid crystal control regions 231, and each of the liquid crystal control regions 231 is disposed corresponding to each of the micro switch units 10. In other words, the range of each liquid crystal control region 231 is defined by each micro-switch unit 10, and the cholesteric liquid crystal molecules of the corresponding liquid crystal control region 231 can be controlled by the micro-switch unit 10. When the voltage signal is transmitted to the first transparent electrode layer 14 and the second transparent electrode layer 22 corresponding to the micro-switch unit 10 and a voltage difference is formed to generate an electric field, the cholesteric liquid crystal molecules in the corresponding liquid crystal control region 231 can be controlled to rotate. The material of the transparent conductive layer 12, the first transparent electrode layer 14, or the second transparent electrode layer 22 of the present embodiment may be a transparent conductive material (e.g., ITO or IZO) or graphene, and is not limited.

In the embodiment, the first transparent substrate 11 is a flexible transparent substrate, and the first transparent substrate 11 and the second transparent substrate 13 are transparent base materials, respectively, but the first substrate 21 is a light-reflecting substrate or a light-absorbing substrate, which reflects or absorbs the incident light. In addition, the material of the first transparent substrate 11, the second transparent substrate 13, or the first substrate 21 may be plastic or glass, respectively. When the first transparent substrate 11 is a glass substrate, the thickness thereof may be between 0.1mm and 0.35mm (0.1 mm ≦ d ≦ 0.35 mm), so that the first transparent substrate 11 has a bendable characteristic. Specifically, while a generally thick glass substrate (for example, 0.5mm to 1.5 mm) has a high hardness and is hard to bend or deform by pressing, when a glass having a thickness of only 0.1mm to 0.35mm is used for the first transparent substrate 11, it exhibits flexibility and has a function of pressing and writing. In some embodiments, the first transparent substrate 11 may be polished to a thickness between 0.1mm and 0.35mm by, for example, but not limited to, a Chemical Mechanical Planarization (CMP) process. In some embodiments, if the second transparent substrate 13 and the first substrate 21 are also flexible, the micro-switch electronic writing board E can be made into a curved writing board or a display.

The first cholesteric liquid crystal module 2 can correspondingly display a color. Specifically, the micro-switch electronic writing board E can be prepared by adding different amounts of optical rotatory agents to the first cholesteric liquid crystal layer 23 of the first cholesteric liquid crystal module 2 to prepare colors such as red (R), green (G), or blue (B). Herein, the color displayed by the first cholesteric liquid crystal module 2 may be selected from, for example, but not limited to, one of red, green and blue, or other visible light colors. The cholesteric liquid crystal is characterized in that a special arrangement structure is achieved by adding a light rotation agent into the nematic liquid crystal, and molecules of the cholesteric liquid crystal can present at least several different stable states or transient states such as a Focal conic state (Focal conic state), a planar state (planar state), a vertical state (homeotropic state) and the like under the conditions of different voltage differences, physical pressures and/or temperatures, so that the display or clearing effect is achieved. Therefore, part of the light can be reflected and/or part of the light can pass through the cholesterol liquid crystal by changing the axial direction of the spiral structure of the cholesterol liquid crystal. That is, the display, writing, and even wiping functions of the micro-switch electronic writing board E can be achieved by different light reflectivity or transmittance of the cholesteric liquid crystal molecules under different states.

The micro-switch electronic writing board E of the present embodiment further includes a voltage control circuit 4 electrically connected to the micro-switch array module 1 and the first cholesteric liquid crystal module 2, respectively. Here, the voltage control circuit 4 is electrically connected to the transparent conductive layer 12 of each micro-switch unit 10 and the second transparent electrode layer 22 of the first cholesteric liquid crystal module 2. When the micro switch unit 10 is pressed (fig. 3B) to make the transparent conductive layer 12 contact with the first transparent electrode layer 14, and further to make the micro switch unit 10 conduct electricity, the voltage control circuit 4 can transmit the first voltage V1 to the first transparent electrode layer 14 through the transparent conductive layer 12 of the micro switch unit 10, so that the cholesterol liquid crystal molecules of the corresponding first cholesterol liquid crystal layer 23 are switched to a state, thereby displaying the writing track T or the wiping writing track T.

When a user wants to write characters or draw patterns on the micro-switch electronic writing board E, the user can select a writing mode, and use a finger, a writing pen P (fig. 3B) or other hard objects to write on the micro-switch electronic writing board E, at this time, the micro-switch unit 10 corresponding to the writing position (pressing position) is pressed to make the transparent conductive layer 12 of the micro-switch unit 12 contact with the first transparent electrode layer 14 to be conducted, the voltage control circuit 4 can transmit a first voltage V1 to the first transparent electrode layer 14 through the conductive layer 12 of the conductive micro-switch unit 10, and then transmit the first voltage V1 to the first transparent electrode layer 14 on the lower surface of the second transparent substrate 13 through the conductive hole 133, the voltage control circuit 4 also transmits a second voltage V2 (for example, but not limited to 0V) to the second transparent electrode layer 22, and an electric field generated by a voltage difference (V1-V2) between the first transparent electrode layer 14 and the second transparent electrode layer 22 forces the cholesterol liquid crystal molecules of the corresponding first cholesterol liquid crystal layer 23 to be in a focal state, so as to be in a planar writing track T. Here, the first voltage V1 minus the second voltage V2 is equal to the writing voltage.

For example, in the micro-switch electronic writing board E of the present embodiment, when the micro-switch unit 10 is not pressed and no voltage difference is generated between the first transparent electrode layer 14 and the second transparent electrode layer 22, the cholesteric liquid crystal molecules of the first cholesteric liquid crystal layer 23 are arranged in a focal conic state. At this time, most of the incident light can pass through the first transparent substrate 11 and the second transparent substrate 13 and penetrate through the first cholesteric liquid crystal layer 23, and a small portion of the incident light is scattered, so that the user can see the background color of the micro-switch electronic writing board E, such as black. When a user writes on the micro-switch electronic writing board E with a finger, a writing pen P, or other hard objects to turn on the corresponding micro-switch unit 10, the first voltage V1 is transmitted to the first transparent electrode layer 14 through the turned-on micro-switch unit 10, so that the electric field generated by the voltage difference (V1-V2) between the first transparent electrode layer 14 and the second transparent electrode layer 22 can make the corresponding cholesterol liquid crystal molecules change state from the original focal conic state to be arranged in a planar state. At this time, a part of the incident light is bragg-reflected at the pressed portion (i.e., the depression of the first transparent substrate 11), and the reflected light (having a specific wavelength) is emitted from the light incident surface 111. Meanwhile, the micro-switch electronic writing board E will display the color of the reflected light at the pressed position, and accordingly display the writing track T (fig. 1), and the writing track T will show the color (e.g. red) corresponding to the first cholesteric liquid crystal module 2. Therefore, if a user writes characters or draws patterns on the micro-switch electronic writing board E to generate a writing track T, the writing track T will show a color corresponding to the reflected light, i.e., a color corresponding to the display of the micro-switch electronic writing board E.

On the other hand, when the user attempts to wipe the writing trace T on the micro-switch electronic writing board E, the user can select a wiping mode (partial or full wiping is possible). Here, the first voltage V1 minus the second voltage V2 supplied by the voltage control circuit 4 is equal to the wiping voltage. When a user presses (back and forth) on a writing trace T to be wiped by using a writing pen P or other wiping tools, the transparent conductive layer 12 of the micro-switch unit 10 is in contact with the first transparent electrode layer 14 and is conducted by the micro-switch unit 10 corresponding to the wiping position. At this time, the first voltage V1 transmitted by the voltage control circuit 4 to the transparent conductive layer 12 is transmitted to the first transparent electrode layer 14 through the conducting micro-switch unit 10, and then transmitted to the first transparent electrode layer 14 on the lower surface of the second transparent substrate 13 through the conductive hole 133. At this time, the electric field generated by the voltage difference (V1-V2) between the first transparent electrode layer 14 and the second transparent electrode layer 22 forces the corresponding cholesteric liquid crystal molecules to change from the planar state to the focal conic state, thereby clearing (wiping) the corresponding writing track T. Here, the difference between the first voltage V1 and the second voltage V2 is the wiping voltage.

In other words, in the micro-switch electronic writing board E of the present embodiment, when the user sees a colored writing track T on the light incident surface 111, if the user selects the wiping mode and uses the writing pen P (or the wiping pen) to wipe the writing track T to turn on the corresponding micro-switch unit 10, the first voltage V1 transmitted by the voltage control circuit 4 is transmitted to the first transparent electrode layer 14 through the micro-switch unit 10, so that the electric field generated by the voltage difference (V1-V2) between the first transparent electrode layer 14 and the second transparent electrode layer 22 can make the corresponding cholesteric liquid crystal molecules change from the original planar state to the focal conic state arrangement. At this time, most of the incident light can pass through the first transparent substrate 11 and the second transparent substrate 13 and penetrate through the first cholesteric liquid crystal layer 23 at the wiped portion (i.e. the depression of the first transparent substrate 11), so that the user can see the ground color of the micro-switch electronic writing board E at the wiped portion, thereby clearing the writing trace T at the wiped portion.

In addition, in some embodiments, the voltage control circuit 4 may also be directly electrically connected to all of the first transparent electrode layers 14. In this way, when the user switches the micro-switch electronic writing board E to a full-clear mode by pressing a full-clear key (virtual or physical key, not shown) on the micro-switch electronic writing board E, the voltage control circuit 4 can directly transmit a clear voltage to all the first transparent electrode layers 14 (without passing through the micro-switch unit W), so as to drive all the cholesteric liquid crystals in the liquid crystal control region 231 to be in a focal conic state, thereby clearing all the writing tracks T on the whole screen. Of course, the voltage control circuit 4 can also directly send another type of erasing voltage to the second transparent electrode layer 22 to erase all the writing tracks T on the whole screen.

In the micro-switch electronic writing board E of the present embodiment, the structures of the micro-switch array module 1 and the first cholesteric liquid crystal module 2 are very simple, and the manufacturing cost is relatively low. Moreover, the micro switch array module 1 and the first cholesteric liquid crystal module 2 of the present embodiment only need to be overlapped without precise positioning, the micro switch array module 1 can control the display of the first cholesteric liquid crystal module 2, and the manufacturing process is also very simple. In other words, when the micro switch unit 10 is pressed to make the transparent conductive layer 12 contact with the first transparent electrode layer 14, and further the micro switch unit 10 is turned on, the voltage control circuit 4 can transmit a control voltage (the first voltage V1) to the first transparent electrode layer 14 through the transparent conductive layer 12 of the micro switch unit 10, so that the cholesterol liquid crystal molecules of the corresponding first cholesterol liquid crystal layer 23 are switched, and accordingly, the writing trace T or the erasing writing trace T can be displayed. Therefore, the micro-switch electronic writing board E with the function of detecting the writing position or the erasing position of the present embodiment has a relatively simple structure, a relatively low manufacturing cost, and a relatively simple manufacturing process.

Referring to fig. 3C, the micro-switch electronic writing board E of the present embodiment has substantially the same components and connection relationship as the micro-switch electronic writing board of the previous embodiment. The difference is that the first substrate 21 of the present embodiment is a transparent substrate, and the micro-switch electronic writing board E further includes a back plate 5, where the back plate 5 is disposed on a surface of the first substrate 21 opposite to the first cholesteric liquid crystal layer 23. Here, the back plate 5 is disposed on the surface 212 of the first substrate 21. The back plate 5 may be a black light absorbing plate or comprise a light absorbing layer, or the back plate 5 may also be a white light reflecting plate or comprise a light reflecting layer. When the back plate 5 is a black light absorbing plate or contains a light absorbing layer, it will absorb light passing through the surface 212, making the micro-switch electronic writing board E a black board. In some embodiments, the material of the black light-absorbing plate (or the light-absorbing film) may be the same as that of a black matrix (black matrix) of the liquid crystal display device. In addition, when the back plate 5 is a white light reflecting plate or includes a light reflecting layer, it reflects the light passing through the surface 212, making the micro-switch electronic writing board E a white board. In some embodiments, the material of the white light reflection plate (or the white light reflection film) may include, for example, metal oxide, high-reflection paint (white paint), or a combination thereof, which is not limited in the present invention. Alternatively, in different embodiments, the color of the back plate 5 is not limited to black or white, and may be other colors or a combination of colors, without limitation.

Fig. 4A and fig. 4B are schematic structural diagrams of another embodiment of the micro-switch electronic writing board provided by the present invention, respectively. The micro-switch electronic writing board E of the present embodiment has substantially the same component composition and connection relationship as the micro-switch electronic writing board E of the previous embodiment. The difference is that the micro-switch electronic writing board E of the present embodiment includes the first cholesteric liquid crystal module 2 of the previous embodiment, and a third transparent electrode layer 24 disposed at an interval is further disposed on the other surface 212 of the first substrate 21 of the first cholesteric liquid crystal module 2, and the third transparent electrode layer 24 is electrically connected to the first transparent electrode layer 14 (fig. 4B).

In addition, the micro-switch electronic writing board E of the present embodiment further includes a second cholesteric liquid crystal module 3, and the second cholesteric liquid crystal module 3 and the first cholesteric liquid crystal module 2 are overlapped. The second cholesteric liquid crystal module 3 is disposed on a side of the first cholesteric liquid crystal module 2 away from the micro-switch array module 1, and the first cholesteric liquid crystal module 2 and the second cholesteric liquid crystal module 3 display different colors correspondingly. Here, it is assumed that the color corresponding to the first cholesteric liquid crystal module 2 is red, and the color corresponding to the second cholesteric liquid crystal module 3 is green. As shown in fig. 4A and 4B, the second cholesteric liquid crystal module 3 includes a second substrate 31, a fourth transparent electrode layer 32 and a second cholesteric liquid crystal layer 33. Herein, the fourth transparent electrode layer 32 is a common electrode and is disposed on the surface 311 of the second substrate 31 facing the second cholesteric liquid crystal layer 33, and the second cholesteric liquid crystal layer 33 is disposed on the fourth transparent electrode layer 32. In addition, the third transparent electrode layer 24 is disposed on the surface 212 of the first substrate 21 facing the second cholesteric liquid crystal layer 33 at an interval, so that the second cholesteric liquid crystal layer 33 is sandwiched between the third transparent electrode layer 24 and the fourth transparent electrode layer 32. Herein, the second cholesteric liquid crystal module 3 is overlapped with the first cholesteric liquid crystal module 2 through the first substrate 21 such that the second cholesteric liquid crystal layer 33 is interposed between the first substrate 21 and the second substrate 31. In addition, the second cholesteric liquid crystal layer 33 may include a plurality of liquid crystal control regions 331, and each of the liquid crystal control regions 331 is disposed corresponding to each of the micro-switch units 10, each of the transparent conductive layers 12, each of the first transparent electrode layers 14, and each of the third transparent electrode layers 24 disposed at intervals.

The first substrate 21 of the present embodiment is a transparent substrate, but the second substrate 31 is a light-absorbing substrate or a light-reflecting substrate. Of course, in a different embodiment, as in fig. 3C, when the second substrate 31 is a transparent substrate, a back plate may be disposed on the surface 312 of the second substrate 31 away from the second cholesteric liquid crystal layer 33. In addition, each of the first transparent electrode layers 14 of the present embodiment is electrically connected to each of the corresponding third transparent electrode layers 24 (fig. 4B), so that the voltage transmitted to the first transparent electrode layers 14 can be transmitted to the corresponding third transparent electrode layers 24 at the same time. In addition, the voltage control circuit 4 of the present embodiment is electrically connected to the transparent conductive layer 12, the second transparent electrode layer 22, and the fourth transparent electrode layer 32, respectively. Herein, the first voltage V1 transmitted by the voltage control circuit 4 to the transparent conductive layer 12 may be a writing voltage or a erasing voltage, and the second voltage V2 and the third voltage V3 transmitted by the voltage control circuit 4 to the second transparent electrode layer 22 and the fourth transparent electrode layer 32 may be a common voltage (e.g., 0 volt), a writing voltage or an erasing voltage, depending on writing or erasing. In addition, the material of the first transparent substrate 11, the second transparent substrate 13, the first substrate 21, or the second substrate 31 of the present embodiment may be plastic or glass, and the material of the transparent conductive layer 12, the first transparent electrode layer 14, the second transparent electrode layer 22, the third transparent electrode layer 24, or the fourth transparent electrode layer 32 may be a transparent conductive material or graphene, which are not limited thereto.

As shown in fig. 4B, in the micro-switch electronic writing board E of the present embodiment, when the micro-switch unit 10 is pressed to turn on the micro-switch unit 10, the voltage control circuit 4 may apply the first voltage V1 to the first cholesteric liquid crystal module 2 and/or the second cholesteric liquid crystal module 3 through the micro-switch unit 10, thereby displaying the writing track T or wiping the writing track T. Specifically, assuming that a user writes on the micro-switch electronic writing board E and the writing trace T is to show a red color corresponding to the first cholesteric liquid crystal module 2, and when the writing pen P presses and writes on the light incident surface 111 such that the micro-switch unit 10 corresponding to the pressed position is turned on, the first voltage V1 may be transmitted to the first transparent electrode layer 14 on the second surface 132 of the second transparent substrate 13 through the transparent conductive layer 12 of the micro-switch unit 10, thereby controlling the cholesteric liquid crystal molecules corresponding to the first cholesteric liquid crystal module 2 to be in a planar state, so as to show the writing trace a corresponding red color. Here, the difference between the first voltage V1 and the second voltage V2 is a writing voltage. At this time, the first voltage V1 is also transmitted to the third transparent electrode layer 24 through the first transparent electrode layer 14, in order to not display the green color corresponding to the second cholesteric liquid crystal module 3, the voltage control circuit 4 does not transmit the common voltage, but transmits a third voltage V3, which is the same as the first voltage V1, to the fourth transparent electrode layer 32 (i.e. the third voltage V3 is equal to the first voltage V1), so that the voltage difference between the third transparent electrode layer 24 and the fourth transparent electrode layer 32 corresponding to the pressed position is 0, and thus the conduction of the micro-switch unit 10 does not affect the liquid crystal control region 331 of the second cholesteric liquid crystal layer 33 of the corresponding second cholesteric liquid crystal module 3, and therefore, the writing trace T does not display the green color corresponding to the second cholesteric liquid crystal module 3.

On the contrary, if the user selects green, although the first voltage V1 can be transmitted to the first transparent electrode layer 14 through the micro switch unit 10, the voltage control circuit 4 will not transmit the common voltage, but transmit the second voltage V2 same as the first voltage V1 to the second transparent electrode layer 22, so that the voltage difference between the first transparent electrode layer 14 and the second transparent electrode layer 22 is 0, and the writing track T will not present red corresponding to the first cholesteric liquid crystal module 2; however, the first voltage V1 is transmitted to the third transparent electrode layer 24 through the first transparent electrode layer 14, so that a voltage difference exists between the third transparent electrode layer 24 and the fourth transparent electrode layer 32 (common voltage) to make the cholesteric liquid crystal molecules corresponding to the second cholesteric liquid crystal layer 33 transition to a planar state, thereby making the writing track T display the green color corresponding to the second cholesteric liquid crystal module 3. In addition, if the cholesteric liquid crystal molecules in the first cholesteric liquid crystal module 2 and the second cholesteric liquid crystal module 3 are in a planar state at the same time, the writing track T will display a mixed color of red and green (blue), thereby enabling the micro-switch electronic writing board E to display a colorful writing track T. Similarly, in the wiping mode, the user may also choose to wipe the writing trace of a certain color or to wipe off the writing trace of a mixed color of two colors according to the above control principle, and the specific control method may refer to the above description.

In addition, in some embodiments, a third cholesteric liquid crystal module (not shown) may be further stacked on a side of the second cholesteric liquid crystal module 3 away from the first cholesteric liquid crystal module 2, and corresponding colors of the third cholesteric liquid crystal module, the first cholesteric liquid crystal module 2, and the second cholesteric liquid crystal module 3 are different from each other, so that the color of the writing track T is diversified.

Fig. 5A and 5B are schematic structural views of another embodiment of a micro-switch electronic writing board provided in the present invention. As shown in fig. 5A and 5B, the micro-switch electronic writing board E of the present embodiment and the micro-switch electronic writing board E of the previous embodiment have substantially the same component and connection relationship. The difference is that the micro-switch electronic writing board E of the present embodiment further includes a second cholesteric liquid crystal module 3, and the second cholesteric liquid crystal module 3 and the first cholesteric liquid crystal module 2 are overlapped.

Here, the color corresponding to the first cholesteric liquid crystal module 2 is red, and the color corresponding to the second cholesteric liquid crystal module 3 is green. As shown in fig. 5A and 5B, the second cholesteric liquid crystal module 3 includes a second substrate 31, a fourth transparent electrode layer 32, a second cholesteric liquid crystal layer 33, a third transparent substrate 34, and a fifth transparent electrode layer 35. Herein, the fourth transparent electrode layer 32 may be a common electrode and is disposed globally on the surface 311 of the second substrate 31 facing the second cholesteric liquid crystal layer 33, and the second cholesteric liquid crystal layer 33 is disposed on the fourth transparent electrode layer 32. In addition, the third transparent substrate 34 is disposed on the second cholesteric liquid crystal layer 33, and a surface 341 of the third transparent substrate 34 facing the second cholesteric liquid crystal layer 33 is disposed with a fifth transparent electrode layer 35 disposed at an interval, so that the second cholesteric liquid crystal layer 33 is sandwiched between the fifth transparent electrode layer 35 and the fourth transparent electrode layer 32. The second cholesteric liquid crystal module 3 is overlapped with the first cholesteric liquid crystal module 2 through the first substrate 21 and the third transparent substrate 34. In addition, the second cholesteric liquid crystal layer 33 may include a plurality of liquid crystal control regions 331, and each of the liquid crystal control regions 331 corresponds to each of the micro-switch units 10, each of the transparent conductive layers 12, each of the first transparent electrode layers 14, and each of the fifth transparent electrode layers 35 disposed at intervals.

The first substrate 21 of the present embodiment is a transparent substrate, but the second substrate 31 is a light-absorbing substrate or a light-reflecting substrate. Of course, in a different embodiment, as in fig. 3C, when the second substrate 31 is a transparent substrate, a back plate may be disposed on the surface 312 of the second substrate 31 away from the second cholesteric liquid crystal layer 33. In addition, the fifth transparent electrode layers 35 of the present embodiment are electrically connected to the corresponding first transparent electrode layers 14, so that the voltage transmitted to the first transparent electrode layers 14 can be transmitted to the corresponding fifth transparent electrode layers 35 at the same time. In addition, the voltage control circuit 4 of the present embodiment is electrically connected to the transparent conductive layer 12, the second transparent electrode layer 22, and the fourth transparent electrode layer 32, respectively. Herein, the first voltage V1 transmitted by the voltage control circuit 4 to the transparent conductive layer 12 may be a writing voltage or a erasing voltage, and the second voltage V2 and the third voltage V3 transmitted by the voltage control circuit 4 to the second transparent electrode layer 22 and the fourth transparent electrode layer 32 may be a common voltage (e.g., 0 volt), a writing voltage or an erasing voltage, depending on writing or erasing. In addition, in the present embodiment, the material of the first transparent substrate 11, the second transparent substrate 13, the third transparent substrate 34, the first substrate 21, or the second substrate 31 may be plastic or glass, and the material of the transparent conductive layer 12, the first transparent electrode layer 14, the second transparent electrode layer 22, the third transparent electrode layer 24, the fourth transparent electrode layer 32, or the fifth transparent electrode layer 35 may be a transparent conductive material or graphene, which is not limited thereto.

As shown in fig. 5B, in the micro-switch electronic writing board E of the present embodiment, when the micro-switch unit 10 is pressed to turn on the micro-switch unit 10, the voltage control circuit 4 can apply the first voltage V1 to the first cholesteric liquid crystal module 2 and/or the second cholesteric liquid crystal module 3 through the micro-switch unit 10, thereby displaying the writing track T or wiping the writing track T. Specifically, assuming that a user writes on the micro-switch electronic writing board E and the writing trace T is to show a red color corresponding to the first cholesteric liquid crystal module 2, and when the writing pen P presses and writes on the light incident surface 111 such that the micro-switch unit 10 corresponding to the pressed position is turned on, the first voltage V1 may be transmitted to the first transparent electrode layer 14 on the second surface 132 of the second transparent substrate 13 through the transparent conductive layer 12 of the micro-switch unit 10, thereby controlling the cholesteric liquid crystal molecules corresponding to the first cholesteric liquid crystal module 2 to be in a planar state, so as to show the writing trace a corresponding red color. At this time, the first voltage V1 is also transmitted to the fifth transparent electrode layer 35 through the first transparent electrode layer 14, and in order to not display the green color corresponding to the second cholesteric liquid crystal module 3, the voltage control circuit 4 does not transmit the common voltage, but transmits the third voltage V3 to the fourth transparent electrode layer 32, which is the same as the first voltage V1, such that the voltage difference between the fifth transparent electrode layer 35 and the fourth transparent electrode layer 32 corresponding to the pressed position is 0, thereby the conduction of the micro-switch unit 10 does not affect the liquid crystal control region 331 of the second cholesteric liquid crystal layer 33 of the corresponding second cholesteric liquid crystal module 3, and therefore, the writing track T does not display the green color corresponding to the second cholesteric liquid crystal module 3.

On the contrary, if the user selects green, although the first voltage V1 can be transmitted to the first transparent electrode layer 14 through the micro switch unit 10, the voltage control circuit 4 will not transmit the common voltage, but transmit the second voltage V2, which is the same as the first voltage V1, to the second transparent electrode layer 22, so that the voltage difference between the first transparent electrode layer 14 and the second transparent electrode layer 22 is 0, and the writing track T will not show red corresponding to the first cholesteric liquid crystal module 2; however, the first voltage V1 is transmitted to the fifth transparent electrode layer 35 through the first transparent electrode layer 14, so that a voltage difference exists between the fifth transparent electrode layer 35 and the fourth transparent electrode layer 32 (the third voltage V3 is a common voltage) to transition the cholesteric liquid crystal molecules corresponding to the second cholesteric liquid crystal layer 33 to a planar state, thereby the writing track T shows a green color corresponding to the second cholesteric liquid crystal module 3. In addition, if the cholesteric liquid crystal molecules of the first cholesteric liquid crystal module 2 and the second cholesteric liquid crystal module 3 are in a planar state at the same time, the writing track T will display a mixed color of red and green (blue), so that the micro-switch electronic writing board E can display a colorful writing track T. Similarly, in the wiping mode, the user may also choose to wipe the writing trace of a certain color or to wipe off the writing trace of a mixed color of two colors according to the above control principle, and the specific control method may refer to the above description.

In addition, in some embodiments, a third cholesteric liquid crystal module (not shown) may be further stacked on a side of the second cholesteric liquid crystal module 3 away from the first cholesteric liquid crystal module 2, and corresponding colors of the third cholesteric liquid crystal module, the first cholesteric liquid crystal module 2, and the second cholesteric liquid crystal module 3 are different, so that the color of the writing track T is more diversified.

In summary, the micro-switch electronic writing board of the present invention includes a micro-switch array module and a cholesteric liquid crystal module. The micro-switch array module is provided with a plurality of micro-switch units arranged in an array manner, a transparent conducting layer of each micro-switch unit is arranged on the surface of the first light-transmitting substrate, which is opposite to the light incident surface, and a first transparent electrode layer is arranged on the first surface of the second light-transmitting substrate and extends to the second surface of the second light-transmitting substrate through the conducting hole; the micro-switch array module is mutually overlapped with the cholesterol liquid crystal module through the second transparent substrate, so that the cholesterol liquid crystal layer is arranged between the first substrate and the second transparent substrate. Therefore, the structure of the micro-switch array module and the cholesterol liquid crystal module is quite simple, and the manufacturing cost is not high; the micro-switch array module and the cholesterol liquid crystal module are overlapped to form the micro-switch electronic writing board with the function of detecting the writing position or wiping the position, and the working procedure is quite simple and convenient. Therefore, the microswitch electronic writing board has the advantages of simple manufacturing process and low manufacturing cost, and the voltage of the electrode layers such as the first transparent electrode layer, the second transparent electrode layer and the like is controlled by the voltage control circuit, so the microswitch electronic writing board can also have the function of detecting the writing position or the wiping position.

The foregoing is by way of example only, and not limiting. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

1. A micro-switch electronic tablet, comprising:

a micro switch array module having a plurality of micro switch units arranged in an array, each micro switch unit comprising:

a first transparent substrate having a light incident surface;

a transparent conductive layer arranged on the surface of the first light-transmitting substrate back to the light incident surface;

a second transparent substrate having a first surface facing the transparent conductive layer and a second surface opposite to the first surface, the second transparent substrate having a conductive hole penetrating through the first surface and the second surface;

a first transparent electrode layer disposed on the first surface of the second transparent substrate and extending to the second surface of the second transparent substrate through the conductive hole; and

at least one spacer disposed between the first transparent substrate and the second transparent substrate; and

a first cholesteric liquid crystal module, comprising:

a first substrate, a second transparent electrode layer is arranged on one surface of the first substrate; and

a first cholesterol liquid crystal layer arranged on the second transparent electrode layer;

the micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second transparent substrate, so that the first cholesterol liquid crystal layer is arranged between the first substrate and the second transparent substrate.

2. The micro-switch electronic tablet of claim 1, further comprising a second cholesteric liquid crystal module, the second cholesteric liquid crystal module comprising:

a second substrate, one surface of which is provided with a fourth transparent electrode layer; and

a second cholesterol liquid crystal layer arranged on the fourth transparent electrode layer;

the second cholesterol liquid crystal module is mutually overlapped with the first cholesterol liquid crystal module through the first substrate, so that the second cholesterol liquid crystal layer is arranged between the first substrate and the second substrate;

wherein, the other surface of the first substrate of the first cholesteric liquid crystal module is provided with a third transparent electrode layer which is arranged at intervals.

3. The microswitch electronic writing board of claim 2 wherein said third transparent electrode layer is electrically connected to said first transparent electrode layer.

4. The microswitch electronic tablet of claim 1, wherein the material of the first transparent substrate, the second transparent substrate, or the first substrate is plastic or glass.

5. The microswitch electronic writing board of claim 1 wherein the first transparent substrate is a glass substrate and the thickness of the glass substrate is between 0.1mm and 0.35 mm.

6. The micro-switch electronic writing board of claim 1, wherein the material of the transparent conductive layer, the first transparent electrode layer, or the second transparent electrode layer is a transparent conductive material or graphene.

7. The micro-switch electronic tablet of claim 1, further comprising:

and the voltage control circuit is electrically connected with the transparent conducting layer and the second transparent electrode layer respectively.

8. The microswitch electronic writing board of claim 2 wherein the material of the second substrate is plastic or glass.

9. The micro-switch electronic writing board of claim 2, wherein the material of the fourth transparent electrode layer is a transparent conductive material or graphene.

10. The micro-switch electronic tablet of claim 1, further comprising a second cholesteric liquid crystal module, the second cholesteric liquid crystal module comprising:

a second substrate, one surface of which is provided with a fourth transparent electrode layer;

a second cholesterol liquid crystal layer arranged on the fourth transparent electrode layer; and

a third transparent substrate disposed on the second cholesteric liquid crystal layer, wherein a fifth transparent electrode layer disposed at an interval is disposed on a surface of the third transparent substrate facing the second cholesteric liquid crystal layer,

the second cholesteric liquid crystal module is mutually overlapped with the first cholesteric liquid crystal module through the first substrate and the third light-transmitting substrate.

11. The microswitch electronic writing board of claim 10 wherein said fifth transparent electrode layer is electrically connected to said first transparent electrode layer.

12. The micro-switch electronic writing board of claim 10, wherein the material of the second substrate or the third transparent substrate is plastic or glass.

13. The micro-switch electronic writing board of claim 10, wherein the material of the fourth transparent electrode layer or the fifth transparent electrode layer is a transparent conductive material or graphene.

14. The micro-switch electronic tablet of claim 2 or 10, further comprising:

and the voltage control circuit is electrically connected with the transparent conducting layer, the second transparent electrode layer and the fourth transparent electrode layer respectively.