CN110554545B

CN110554545B - Micro-switch electronic writing board

Info

Publication number: CN110554545B
Application number: CN201810555231.7A
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: CN110554545A

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 first transparent electrode layer of each micro-switch unit is arranged on the first surface of the second light-transmitting substrate and extends to the first conductive hole. The third transparent substrate of the first cholesterol liquid crystal module is provided with a plurality of second conductive holes penetrating through the third transparent substrate, and the third transparent electrode layer is arranged on the surface of the third transparent substrate and extends into the second conductive holes. The micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second light-transmitting substrate and the third light-transmitting substrate, and the third transparent electrode layer is electrically connected with the first transparent electrode layer through the second conductive hole and the first conductive hole. The invention also discloses a cholesterol liquid crystal module for the micro-switch electronic writing board. The invention has the advantages of simple and convenient manufacturing process and low manufacturing cost.

Description

Micro-switch electronic writing board

Technical Field

The present invention relates to a micro-switch electronic writing board and a cholesterol liquid crystal module, and more particularly, to a micro-switch electronic writing board capable of detecting writing or erasing positions and a cholesterol liquid crystal module of the micro-switch electronic writing board.

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 achieving different light transmittance by reflecting and penetrating two different liquid crystal molecule arrangement states under different voltage differences. 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 when in a planar state and a focal conic state, the cholesteric liquid crystal can still maintain the original state and display screen when the voltage is turned off and disappears, and the voltage is applied only when the cholesteric liquid crystal is changed into the other state and display screen. 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 a writing position or perform a 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 lot of semiconductor mask 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. Moreover, the yield is also low due to the additional semiconductor process steps.

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

Furthermore, if semiconductor processes are eliminated, the conventional cholesteric liquid crystal module cannot achieve the function of detecting the writing position or the wiping position. Therefore, it is an important subject to provide a cholesteric liquid crystal module having a function of detecting a writing position or a wiping position while eliminating a semiconductor process and reducing a manufacturing cost.

Disclosure of Invention

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

Another objective of the present invention is to provide a cholesteric liquid crystal module that can be used with the micro-switch electronic writing board with the function of detecting the writing position or the erasing position without the semiconductor process.

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 arranged on the first surface of the second light-transmitting substrate and extends into the first conductive hole. The spacer is arranged between the first light-transmitting substrate and the second light-transmitting substrate. The first cholesterol liquid crystal module comprises a first substrate, a third transparent substrate, a first cholesterol liquid crystal and a third transparent electrode layer. A second transparent electrode layer is arranged on one surface of the first substrate. The third transparent substrate is provided with a plurality of second conductive holes penetrating through the third transparent substrate. The first cholesterol liquid crystal layer is arranged between the third light-transmitting substrate and the second transparent electrode layer. The third transparent electrode layer is arranged on the surface of the third light-transmitting substrate facing the first cholesterol liquid crystal layer and extends into the second conductive hole. The micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second light-transmitting substrate and the third light-transmitting substrate, and the third transparent electrode layer is electrically connected with the first transparent electrode layer through the second conductive hole and the first conductive hole.

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

In one embodiment, the fourth transparent electrode layer is electrically connected to the third 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 fifth transparent electrode layer is disposed on a surface of the second substrate. The second cholesterol liquid crystal layer is arranged on the fifth 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.

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

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

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

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

In an embodiment, the material of 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 fifth transparent electrode layer, respectively.

The invention further provides a cholesteric liquid crystal module, which includes a substrate, a transparent substrate, a cholesteric liquid crystal layer, and a counter transparent electrode layer. A transparent electrode layer is disposed on one surface of the substrate. The transparent substrate is provided with a plurality of conductive holes penetrating through the transparent substrate. The cholesterol liquid crystal layer is arranged between the light-transmitting substrate and the transparent electrode layer. The opposite transparent electrode layers are arranged on the surface of the light-transmitting substrate facing the cholesterol liquid crystal layer at intervals and extend into the conductive holes.

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

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

In summary, the micro-switch electronic writing board of the present invention includes 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 manner, a transparent conducting layer of each micro-switch unit is arranged on the surface of the first light-transmitting substrate opposite to the light incident surface, a first transparent electrode layer is arranged on the first surface of the second light-transmitting substrate and is extended into the first conducting hole, and a third transparent electrode layer of the cholesterol liquid crystal module is arranged on the surface of the third light-transmitting substrate facing to the first cholesterol liquid crystal layer and is extended into the second conducting hole; the micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second light-transmitting substrate and the third light-transmitting substrate, and the third transparent electrode layer is electrically connected with the first transparent electrode layer through the second conductive hole and the first conductive hole. 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 electronic writing board with the function of detecting the writing position or the wiping position can be manufactured after the micro-switch array module and the cholesterol liquid crystal module are mutually overlapped, and the working procedure is quite simple and convenient. Therefore, the micro-switch electronic writing board and the cholesterol liquid crystal module have the effects of simple manufacturing procedures and low manufacturing cost, and have 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 schematic view of one embodiment of the micro-switch electronic tablet of FIG. 2 taken along line A-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 microswitch electronic writing board shown in fig. 3A or 3B provided with a back plate.

Fig. 4A and fig. 4B are schematic structural diagrams 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 a micro-switch electronic writing board provided in the present invention.

Fig. 6 is a schematic structural view of a cholesteric liquid crystal module according to the present invention.

Detailed Description

The micro-switch electronic writing board and the cholesteric liquid crystal module 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 the directional indicators (such as upper, lower, left, right, front, and rear … …) 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 is also changed accordingly.

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 meeting or teaching, but the invention is not limited thereto. The micro-switch electronic writing board provided by the embodiments 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 always reserved, and only the images or the pictures are changed into another state or displayed pictures, the additional power supply is needed to be input, so 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 characteristic 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 an image or a picture, no additional power needs to be input, the image or the picture can be kept all the time, and only the image or the picture is changed into another state or the picture is displayed, the additional power needs to be input, so 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 of an embodiment of the micro-switch electronic tablet according to the present invention, fig. 3A isbase:Sub>A cross-sectional exploded perspective view of the micro-switch electronic tablet shown in fig. 2 taken along linebase:Sub>A-base:Sub>A, and fig. 3B isbase:Sub>A schematic structural view of the micro-switch electronic tablet shown in fig. 3A after being assembled and pressed. The micro-switch electronic writing board of the present invention is, for example, but not limited to, a mobile phone, a tablet, or 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 each of the following embodiments has different compositions according to the respective 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, and the micro-switch array module 1 and the first cholesteric liquid crystal module 2 are applied in cooperation. The micro-switch array module 1 has a plurality of micro-switch cells 10 arranged in an array, which is 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 track 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 other films 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 first conductive hole 133 penetrating through the first surface 131 and the second surface 132. As the name implies, the purpose of the first conductive via 133 is for electrical conduction. In the embodiment, if the second transparent substrate 13 is made of glass, a hole can be formed on the second transparent substrate 13 by using laser, and if the second transparent substrate 13 is made of plastic, a hole can be formed by using an etching process to obtain the first 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, extends into the first conductive hole 133, and fills the first conductive hole 133. Therefore, in each micro-switch cell 10, the transparent conductive layer 12, the first transparent electrode layer 14, and the first conductive hole 133 are in one-to-one correspondence. 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, a first cholesteric liquid crystal layer 23, a third transparent substrate 24, and a third transparent electrode layer 25. The second transparent electrode layer 22 is disposed on a surface 211 of the first substrate 21 facing the first cholesteric liquid crystal layer 23. Herein, the second transparent electrode layer 22 may 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 between the third transparent substrate 24 and the second transparent electrode layer 22. The term "overall" 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 at intervals on a surface of the first substrate 21 facing the first cholesteric liquid crystal layer 23, which is not limited in the present invention.

The third transparent substrate 24 has a plurality of second conductive holes 241 penetrating through the third transparent substrate 24, and the third transparent electrode layer 25 is disposed on a surface 242 of the third transparent substrate 24 facing the first cholesteric liquid crystal layer 23 and extended into the second conductive holes 241, so that the third transparent electrode layer 25 can be electrically connected to the corresponding first transparent electrode layer 14 through the second conductive holes 241 and the corresponding first conductive holes 133. Therefore, each micro-switch unit 10 is disposed corresponding to the corresponding transparent conductive layer 12, the first transparent electrode layer 14, the first conductive hole 133, the second conductive hole 241, and the corresponding third transparent electrode layer 25.

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 via the second transparent substrate 13 and the third transparent substrate 24, and the third transparent electrode layer 25 is electrically connected to the first transparent electrode layer 14 via the second conductive via 241 and the first conductive via 133. Here, the second conductive holes 241 of the third transparent substrate 24 are disposed corresponding to and electrically connected to the first conductive holes 133. In some embodiments, the first conductive vias 133 can be electrically connected to the corresponding second conductive vias 241 through electrical connection pads (not shown), so that the micro switch array module 1 and the first cholesteric liquid crystal module 2 are stacked and electrically connected to each other. In addition, 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 transmitted to the third transparent electrode layer 25 through the first conductive hole 133 and the second conductive hole 241.

In fig. 3B, the first cholesteric liquid crystal layer 23 has a plurality of cholesteric liquid crystal molecules (not shown) that can be filled and disposed between the third transparent substrate 24 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 third transparent substrate 24 and the first substrate 21 to seal the outer peripheries of the third transparent substrate 24 and the first substrate 21, so that a gap is formed between the third transparent substrate 24 and the first substrate 21. An accommodation space can be formed by the third transparent substrate 24, the first substrate 21 and the sealing layer, so that the cholesteric liquid crystal molecules can be filled in the accommodation space to form the 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 a voltage signal is transmitted between the third transparent electrode layer 25 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 of 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, the second transparent electrode layer 22, or the third transparent electrode layer 25 in this embodiment may be a transparent conductive material (e.g., ITO or IZO) or graphene, and is not limited.

In the present embodiment, the first transparent substrate 11 is a flexible transparent substrate, and the first transparent substrate 11, the second transparent substrate 13 and the third transparent substrate 24 are transparent substrates, 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, the third transparent substrate 24, or the first substrate 21 may be plastic or glass, respectively. When the first transparent substrate 11 is a glass substrate, the thickness thereof can be between 0.1mm and 0.35mm (d is less than 0.1mm and less than 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, the third transparent substrate 24 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 rotation agents to the first cholesteric liquid crystal layer 23 of the first cholesteric liquid crystal module 2 to formulate 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 reflectivities or transmittances of the cholesteric liquid crystal molecules in 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 cell 10 and the second transparent electrode layer 22 of the first cholesteric liquid crystal module 2. When the micro switch unit 10 is pressed to make the transparent conductive layer 12 contact with the first transparent electrode layer 14 to turn on the micro switch unit 10, the voltage control circuit 4 can transmit the first voltage V1 to the third transparent electrode layer 25 corresponding to the lower surface of the third transparent substrate 24 through the transparent conductive layer 12 and the first transparent electrode layer 14 of the micro switch unit 10 and then through the first conductive hole 133 and the second conductive hole 241, so as to switch the state of the cholesterol liquid crystal molecules of the corresponding first cholesterol liquid crystal layer 23, thereby displaying the writing track T or wiping the 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 contact with the first transparent electrode layer 14 and be conducted, the voltage control circuit 4 can transmit a first voltage V1 to the first transparent electrode layer 14 through the transparent conductive layer 12 of the conducted micro-switch unit 10, and then transmit the first voltage V1 to the third transparent electrode layer 25 on the lower surface 242 of the second transparent substrate 13 through the first conductive hole 133 and the second conductive hole 241, 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 third transparent electrode layer 25 and the second transparent electrode layer 22 forces the cholesteric crystal molecules of the corresponding first cholesteric liquid 23 to change from a focal state to a planar writing state, thereby displaying a 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 third transparent electrode layer 25 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 third transparent electrode layer 25 through the turned-on micro-switch unit 10, so that the electric field generated by the voltage difference (V1-V2) between the third transparent electrode layer 25 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 present a color corresponding to the reflected light, i.e. a color displayed by 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). 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 pressing of 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 third transparent electrode layer 25 on the lower surface of the second transparent substrate 13 through the first conductive hole 133 and the second conductive hole 241. At this time, the electric field generated by the voltage difference (V1-V2) between the third transparent electrode layer 25 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 erase 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 third transparent electrode layer 25 through the micro-switch unit 10, so that the electric field generated by the voltage difference (V1-V2) between the third transparent electrode layer 25 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, the second transparent substrate 13, and the third transparent substrate 24 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 third transparent electrode layers 25. In this way, when the user switches the micro-switch electronic writing board E to a full erase mode by pressing a full erase key (virtual or physical key, not shown) on the micro-switch electronic writing board E, the voltage control circuit 4 can directly transmit an erase voltage to all the third transparent electrode layers 25 (without passing through the micro-switch unit W), so as to drive all the cholesteric liquid crystals in the liquid crystal control regions 231 to transition to a focal conic state, thereby erasing all the writing traces 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 summary, in the micro-switch electronic writing board E of the present embodiment, since the structures of the micro-switch array module 1 and the first cholesteric liquid crystal module 2 are quite simple, 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 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 third transparent electrode layer 25 through the transparent conductive layer 12 of the micro switch unit 10, so as to make the cholesterol liquid crystal molecules of the corresponding first cholesterol liquid crystal layer 23 transition, thereby displaying the writing track T or the erasing writing track T. 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 and convenient manufacturing process.

Referring to fig. 3C, 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 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 212 of the first substrate 21 facing away from the first cholesteric liquid crystal layer 23. 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 absorbs light passing through the surface 212, making the micro-switch electronic writing board E a blackboard. In some embodiments, the material of the black light absorption plate (or the light absorption 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 light passing through the surface 212, making the micro-switch electronic writing board E a whiteboard. In some embodiments, the material of the white light reflecting plate (or the white light reflecting film) may include, for example, a metal oxide, a highly reflective 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, in addition to the first cholesteric liquid crystal module 2 of the previous embodiment, a fourth transparent electrode layer 26 disposed at an interval on the other surface 212 of the first substrate 21 of the first cholesteric liquid crystal module 2, and each fourth transparent electrode layer 26 is electrically connected to each third transparent electrode layer 25 (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 have different colors.

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 fifth transparent electrode layer 32 and a second cholesteric liquid crystal layer 33. Herein, the fifth transparent electrode layer 32 may be 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 fifth transparent electrode layer 32. In addition, since the fourth transparent electrode layers 26 are disposed at intervals on the surface 212 of the first substrate 21 facing the second cholesteric liquid crystal layer 33, the second cholesteric liquid crystal layer 33 is sandwiched between the fourth transparent electrode layers 26 and the fifth transparent electrode layer 32. The second cholesteric liquid crystal module 3 is stacked with the first cholesteric liquid crystal module 2 via 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. 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, each of the third transparent electrode layers 25 disposed at intervals, and each of the fourth transparent electrode layers 26 disposed at intervals.

In this embodiment, the material of the first transparent substrate 11, the second transparent substrate 13, the third transparent substrate 24, 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 25, the fourth transparent electrode layer 26, or the fifth transparent electrode layer 32 may be a transparent conductive material or graphene, which are not limited thereto. In addition, although the first substrate 21 of the present embodiment is a transparent substrate, the second substrate 31 is a light-reflecting substrate or a light-absorbing substrate and has a light-reflecting or light-absorbing function. In some embodiments, as shown in fig. 3C, when the second substrate 31 is a transparent substrate, a back plate 5 may be disposed on a surface 312 of the second substrate 31 away from the second cholesteric liquid crystal layer 33 to absorb or reflect light.

In addition, each third transparent electrode layer 25 of the present embodiment is electrically connected to each corresponding fourth transparent electrode layer 26, so that the voltage transmitted to the third transparent electrode layer 25 can be transmitted to the corresponding fourth transparent electrode layer 26 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 fifth 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 fifth transparent electrode layer 32 may be a common voltage (e.g., 0V), a writing voltage or an erasing voltage, depending on writing or erasing.

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 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, so as to display the writing track T or wipe the writing track T. Specifically, assuming that a user writes on the micro-switch electronic writing board E and the writing trace T is red corresponding to the first cholesteric liquid crystal module 2, when the writing pen P presses and writes on the light incident surface 111 to turn on the micro-switch unit 10 corresponding to the pressed position, the first voltage V1 may be transmitted to the third transparent electrode layer 25 on the surface 242 of the third transparent substrate 24 through the transparent conductive layer 12 of the micro-switch unit 10, so as to control the cholesteric liquid crystal molecules corresponding to the first cholesteric liquid crystal module 2 to be in a planar state, and the writing trace shows the corresponding red. At this time, the first voltage V1 is also transmitted to the fourth transparent electrode layer 26 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 fifth transparent electrode layer 32, which is the same as the first voltage V1, such that the voltage difference between the fourth transparent electrode layer 26 and the fifth 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 corresponding second cholesteric liquid crystal layer 33, 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 third transparent electrode layer 25 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 third transparent electrode layer 25 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 fourth transparent electrode layer 26 through the third transparent electrode layer 25, so that a voltage difference exists between the fourth transparent electrode layer 26 and the fifth 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), 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 from each other, so that the color of the writing track T is diversified.

Fig. 5A and 5B are schematic views respectively illustrating another embodiment of a micro-switch electronic writing board provided in the present invention. 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 a structure of the second cholesteric liquid crystal module 3, which is different from the structure of the micro-switch array module 1 and the first cholesteric liquid crystal module 2 of the previous embodiments.

Here, the example 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 is also taken as an example for explanation. As shown in fig. 5A and 5B, the second cholesteric liquid crystal module 3 includes a second substrate 31, a fifth transparent electrode layer 32, a second cholesteric liquid crystal layer 33, a fourth transparent substrate 34, and a fourth transparent electrode layer 35. Here, the fifth transparent electrode layer 32 is still 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 fifth transparent electrode layer 32. In addition, the fourth transparent substrate 34 is disposed on the second cholesteric liquid crystal layer 33, and a surface 341 of the fourth transparent substrate 34 facing the second cholesteric liquid crystal layer 33 is disposed with fourth transparent electrode layers 35 disposed at intervals, so that the second cholesteric liquid crystal layer 33 is sandwiched between the fourth transparent electrode layers 35 and the fifth transparent electrode layers 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 fourth 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 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, each of the third transparent electrode layers 25 disposed at intervals, and each of the fourth 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-reflecting substrate or a light-absorbing substrate and has a light-reflecting or light-absorbing function. In some embodiments, as shown in fig. 3C, when the second substrate 31 is a transparent substrate, a back plate 5 may be disposed on a surface 312 of the second substrate 31 away from the second cholesteric liquid crystal layer 33 to absorb or reflect light. In addition, the fourth transparent electrode layer 35 of the present embodiment is electrically connected to the corresponding third transparent electrode layer 25 (fig. 5B), so that the voltage transmitted to the third transparent electrode layer 25 can be transmitted to the corresponding fourth transparent electrode layer 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 fifth 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 correspondingly transmitted by the voltage control circuit 4 to the second transparent electrode layer 22 and the fifth transparent electrode layer 32 may be a common voltage (e.g. 0V), 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 third transparent substrate 24, the fourth transparent substrate 34, 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 25, the fifth transparent electrode layer 32, or the fourth transparent electrode layer 35 is 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 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, so as to display the writing track T or wipe the writing track T. Specifically, assuming that a user writes on the micro-switch electronic writing board E and the writing trace T is red corresponding to the first cholesteric liquid crystal module 2, when the writing pen P presses and writes on the light incident surface 111 to turn on the micro-switch unit 10 corresponding to the pressed position, the first voltage V1 may be transmitted to the third transparent electrode layer 25 on the lower surface 242 of the third transparent substrate 24 through the transparent conductive layer 12 of the micro-switch unit 10, so as to control the cholesteric liquid crystal molecules corresponding to the first cholesteric liquid crystal module 2 to be in a planar state, and the writing trace shows the corresponding red. At this time, the first voltage V1 is also transmitted to the fourth transparent electrode layer 35 through the third transparent electrode layer 25, 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, which is the same as the first voltage V1, to the fifth transparent electrode layer 32, so that the voltage difference between the fourth transparent electrode layer 35 and the fifth 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 corresponding second cholesteric liquid crystal layer 33, 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 third transparent electrode layer 25 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 third transparent electrode layer 25 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 fourth transparent electrode layer 35 through the third transparent electrode layer 25, so that a voltage difference exists between the fourth transparent electrode layer 35 and the fifth 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), so that the micro-switch electronic writing board E can display a colorful writing track T. Similarly, in the erasing mode, the user may also choose to erase the writing trace of a certain color or to erase the writing traces of the mixed colors of two colors according to the above control principle, and the specific control method may refer to the above description.

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. 6 is a schematic structural diagram of a cholesteric liquid crystal module according to the present invention. The cholesteric liquid crystal module of this embodiment can be used in combination with the micro-switch array module mentioned in the previous embodiments to form a micro-switch electronic writing board E. As shown in the figure, the cholesteric liquid crystal module 2' includes a substrate 21', a transparent substrate 24', a cholesteric liquid crystal layer 23', and an opposite transparent electrode layer 25'. The surface 211' of the substrate 21' is provided with a transparent electrode layer 22'. The transparent substrate 24' has a plurality of conductive holes 241' penetrating the transparent substrate 24 '. The cholesterol liquid crystal layer 23' is disposed between the transparent substrate 24' and the transparent electrode layer 22'. The opposite transparent electrode layer 25' is disposed on the surface 242' of the transparent substrate 24' facing the cholesteric liquid crystal layer 23' at an interval and extends into the conductive hole 241'.

In the present embodiment, the material of the transparent substrate 24 'or the substrate 21' may be plastic or glass; and the material of the transparent electrode layer 22 'or the opposite transparent electrode layer 25' may be a transparent conductive material or graphene.

In addition, in the cholesteric liquid crystal module 2' of the present embodiment, the composition of each element, the connection relationship between each element, the variation pattern, and the matching and application manner of the cholesteric liquid crystal module and the micro-switch array module are the same as those of the cholesteric liquid crystal module 2 in the foregoing embodiment, and therefore, the description thereof is not repeated herein.

In summary, the micro-switch electronic writing board and the cholesteric liquid crystal module of the present invention include 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, a transparent conductive 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, a first transparent electrode layer is arranged on the first surface of the second light-transmitting substrate and is extended into the first conductive hole, and a third transparent electrode layer of the cholesterol liquid crystal module is arranged on the surface of the third light-transmitting substrate, which is opposite to the first cholesterol liquid crystal layer, and is extended into the second conductive hole; the micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second light-transmitting substrate and the third light-transmitting substrate, and the third transparent electrode layer is electrically connected with the first transparent electrode layer through the second conductive hole and the first conductive hole. 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 electronic writing board with the function of detecting the writing position or the wiping position can be manufactured after the micro-switch array module and the cholesterol liquid crystal module are mutually overlapped, 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 all equivalent modifications or variations not departing from the spirit and scope of the present invention be included in the claims.

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 first conductive hole penetrating through the first surface and the second surface;

a first transparent electrode layer arranged on the first surface of the second light-transmitting substrate and extending into the first 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;

a third transparent substrate having a plurality of second conductive holes penetrating through the third transparent substrate;

a first cholesterol liquid crystal layer arranged between the third light-transmitting substrate and the second transparent electrode layer; and

a third transparent electrode layer arranged on the surface of the third light-transmitting substrate facing the first cholesterol liquid crystal layer and extending into the second conductive hole;

the micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second transparent substrate and the third transparent substrate, and the third transparent electrode layer is electrically connected with the first transparent electrode layer through the second conductive hole and the first conductive hole.

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 fifth transparent electrode layer; and

a second cholesterol liquid crystal layer arranged on the fifth 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 fourth transparent electrode layer which is arranged at intervals.

3. The micro-switch electronic writing board of claim 2, wherein the fourth transparent electrode layer is electrically connected to the third transparent electrode layer.

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

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

and a voltage control circuit electrically connected to the transparent conductive layer and the second transparent electrode layer.

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 fifth 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 fifth transparent electrode layer;

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

a fourth transparent substrate disposed on the second cholesteric liquid crystal layer, a surface of the fourth transparent substrate facing the second cholesteric liquid crystal layer being provided with a fourth transparent electrode layer disposed at an interval,

the second cholesteric liquid crystal module is mutually overlapped with the first cholesteric liquid crystal module through the first substrate and the fourth transparent substrate.

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

12. The microswitch electronic tablet of claim 10, wherein the material of the second substrate or the fourth 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 fifth transparent electrode layer respectively.