TWI673546B - Micro-switch electronic writing board - Google Patents

Abstract

The invention discloses a micro switch array module, which has a plurality of micro switch units. Each micro switch unit includes a first transparent substrate, a transparent conductive layer, a second transparent substrate, a first transparent electrode layer, and at least one spacer. The first light-transmitting substrate has a light incident surface. The transparent conductive layer is disposed on a surface of the first transparent substrate facing away from 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 first conductive hole penetrating the first surface and the second surface. The first transparent electrode layer is disposed on the first surface of the second light-transmitting substrate, and extends into the first conductive hole. The spacer is disposed between the first transparent substrate and the second transparent substrate.

Description

Micro switch electronic writing board

The present invention relates to a micro switch, and more particularly, to a micro switch module arranged in an array.

Cholesteric liquid crystal is a chiral dopant added to a nematic liquid crystal to make it have a helical arrangement. It uses two different liquid crystal molecules that reflect and penetrate under different voltage differences. State to achieve different light transmission rates and achieve display effects. Among them, in the planar state, the incident light is reflected and colored; in the focal cone state, most of the incident light penetrates and a small part is scattered; and in the vertical state, the incident light completely penetrates.

Since the cholesteric liquid crystal is in a stable state when it is in the planar state and the focal cone state, when the voltage is turned off and disappears, it will still maintain the original state and display screen. Only when changing to another state and display screen, it is necessary to apply Voltage, this kind of low power consumption and memorability, also makes cholesterol liquid crystal the first choice for e-books and writing boards.

At present, most of the cholesteric liquid crystal writing tablets are pressed by physical force to perform the transition. However, in order to detect the writing position or perform local wiping on such a cholesterol liquid crystal writing board, it is necessary to additionally arrange corresponding position sensing elements on the array substrate of the liquid crystal module. However, since position sensing elements are to be arranged on the array substrate, a very large number of semiconductor photomask processes are required. That is to say, in a cholesteric liquid crystal writing tablet with a position detection function, the structure of the element responsible for position sensing is relatively complicated, so the manufacturing cost is relatively increased. In addition, the yield is lower due to the additional semiconductor process steps.

As mentioned above, it is an important issue how to provide a method that eliminates the semiconductor process and reduces the manufacturing cost of cholesteric liquid crystal writing boards. To achieve the elimination of the semiconductor process, it is necessary to provide another method that can sense the writing position of the user. A device for effectively supplying voltage to change the state of cholesterol liquid crystal.

The object of the present invention is to provide a micro switch array module, which has a relatively simple structure and low manufacturing cost, and can also be applied to a cholesteric liquid crystal writing board, so that it has the function of detecting a writing position or a wiping position without a semiconductor process.

The invention provides a micro switch array module. The micro switch array module has a plurality of micro switch units arranged in an array. Each micro switch unit includes a first transparent substrate, a transparent conductive layer, a second transparent substrate, a first transparent electrode layer, and at least one spacer. The first light-transmitting substrate has a light incident surface. The transparent conductive layer is disposed on a surface of the first transparent substrate facing away from 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 has a conductive hole penetrating the first surface and the second surface. The first transparent electrode layer is disposed on the first surface of the second transparent substrate and is disposed in the first conductive hole. The spacer is disposed between the first transparent substrate and the second transparent substrate.

In one embodiment, the first transparent electrode layer is extended to the second surface of the second transparent substrate through the conductive hole.

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

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

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

In one embodiment, the material of the transparent conductive layer is a transparent conductive material or graphene.

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

As mentioned above, in the micro switch array module of the present invention, it has a plurality of micro switch units arranged in an array. The transparent conductive layer of each micro switch unit is disposed on the surface of the first transparent substrate facing away from the light incident surface, and the first transparent electrode layer is disposed on the first surface of the second transparent substrate and extends into the first conductive hole. The structure of this micro switch array module is quite simple, and the manufacturing cost is not high; and by stacking the micro switch array module and the cholesterol liquid crystal module on each other, a micro switch electronics with the function of detecting writing position or wiping position can be made. Writing board, the process is quite simple. Therefore, the micro switch array module of the present invention has the effects of simple and convenient manufacturing processes and low manufacturing costs.

1‧‧‧Micro Switch Array Module

10‧‧‧Micro Switch Unit

11‧‧‧The first transparent substrate

111‧‧‧light incident surface

112‧‧‧ surface (of the first transparent substrate)

12‧‧‧ transparent conductive layer

13‧‧‧Second transparent substrate

131‧‧‧ the first surface

132‧‧‧Second surface

133‧‧‧The first conductive hole

14‧‧‧ the first transparent electrode layer

15‧‧‧ spacer

2‧‧‧First Cholesterol LCD Module

21‧‧‧First substrate

211‧‧‧ (of the first substrate)

212‧‧‧light exit surface

22‧‧‧Second transparent electrode layer

23‧‧‧first cholesterol liquid crystal layer

231‧‧‧LCD control area

24‧‧‧ the third transparent substrate

241‧‧‧Second conductive hole

242‧‧‧ (of the third transparent substrate)

25‧‧‧ the third transparent electrode layer

4‧‧‧Voltage Control Circuit

A-A‧‧‧cut line

E‧‧‧Micro Switch Electronic Writing Pad

P‧‧‧ Writing Pen

V1‧‧‧ the first voltage

V2‧‧‧Second voltage

FIG. 1 is a schematic perspective view of a micro switch array module according to an embodiment of the present invention.

FIG. 2A is a schematic structural diagram of the micro-switch array module shown in FIG. 1 along a line A-A.

FIG. 2B is a schematic structural diagram of a micro-switch electronic writing board composed of the micro-switch array module and the cholesterol liquid crystal module shown in FIG. 2A.

FIG. 3A is a schematic structural diagram of a micro switch array module according to another embodiment of the present invention.

3B is a schematic structural diagram of a micro-switch electronic writing board composed of the micro-switch array module and the cholesterol liquid crystal module shown in FIG. 3A.

Hereinafter, the micro switch array module according to various embodiments provided by the present invention will be described with reference to related drawings. Herein, the same elements will be described with the same reference symbols.

It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain in a specific posture (as shown in the attached drawings) The relative positional relationship, movement, etc. of the components under), if the specific posture changes, the directional indication will change accordingly.

First embodiment

FIG. 1 is a schematic perspective view of a micro switch array module according to an embodiment of the present invention. FIG. 2A is a schematic structural diagram of the micro-switch array module shown in FIG. 1 along a line A-A.

As shown in FIGS. 1 and 2A, the micro switch array module 1 has a plurality of micro switch units 10 arranged in an array. The micro switch unit 10 of this embodiment is configured by using a two-dimensional array as an example. Each micro switch unit 10 includes a first transparent substrate 11, a second transparent substrate 13, a transparent conductive layer 12, 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 this embodiment is the upper surface of the first light-transmitting substrate 11 and is also the surface of the micro switch array module 1 facing the user, and may also be referred to as a writing surface or a display surface. After the micro-switch electronic writing board E composed of the cholesterol liquid crystal module (as described in detail in FIG. 2B and subsequent paragraphs), in some embodiments, a protective film layer or protection may be provided on the light incident surface 111 The substrate is used to protect the micro switch array module 1 and the micro switch electronic writing board E.

In each micro switch unit 10, a transparent conductive layer 12 is disposed on the first light-transmitting substrate 11. The surface 112 facing away from the light incident surface 111. As shown in FIG. 2A, the transparent conductive layer 12 is disposed on a lower surface of the first transparent substrate 11 facing the second transparent substrate 13. 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. The second transparent substrate 13 has a first surface penetrating the first surface 131 and the second surface 132. A conductive hole 133. As the name suggests, the purpose of the first conductive hole 133 is for electrical conduction. In some embodiments, lasers can be used to make holes in the second transparent substrate 13 to obtain the first conductive holes 133 penetrating 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 into the first conductive hole 133. Here, in each micro switch unit 10, the transparent conductive layer 12, the first conductive hole 133 and the first transparent electrode layer 14 have a one-to-one correspondence relationship.

In addition, at least one spacer 15 is disposed between the first transparent substrate 11 and the second transparent substrate 13 so that there is a gap between the first transparent substrate 11 and the second transparent substrate 13, so that the transparent conductive layer 12 There is a gap between the first transparent electrode layer 14 and the first transparent electrode layer 14 on the first surface 131 of the second transparent substrate 13. Specifically, the spacer 15 of this embodiment is enclosed around the periphery and / or the inside of the micro switch unit 10 so that there is a gap between the transparent conductive layer 12 and the first transparent electrode layer 14, thereby forming the micro switch unit 10. In different embodiments, the spacer 15 may also be disposed inside the transparent conductive layer 12 and the first transparent electrode layer 14.

Please refer to FIG. 2B again, which is a schematic structural diagram of a micro switch electronic writing board composed of the micro switch array module and the cholesterol liquid crystal module shown in FIG. 2A. It should be noted that the micro-switch electronic writing board E mentioned in this embodiment may be, for example, but not limited to, a mobile phone, a tablet, or an electronic whiteboard, or other display devices capable of displaying images. When the micro switch electronic writing board E is an electronic whiteboard or an electronic blackboard, it can be used as a large-sized electronic blackboard (or whiteboard) applied to an interactive writing system such as a conference or a teaching, but the present invention is not limited thereto. The micro-switch electronic writing tablet mentioned in this embodiment uses the characteristics of cholesteric liquid crystal, so it is a bistable display device. When the micro-switch electronic writing tablet displays an image or a picture, no additional power supply is required. This image or screen will always be retained. Only when changing to another state or display screen, additional power needs to be input. Therefore, the micro-switch electronic writing board is a relatively power-saving electronic device. That is, when an image or screen is displayed on the micro-switch electronic writing board, there is no need to input additional power. This image or screen is always retained. Only when changing to another state or display screen, additional power is required. Therefore, It has the characteristics of low cost and power saving.

As shown in FIG. 2B, the micro switch array module 1 and the first cholesterol liquid crystal module 2 shown in FIG. 2A constitute a micro switch electronic writing board E. The first cholesteric liquid crystal module 2 includes a first cholesteric liquid crystal layer 23, a second transparent electrode layer 22, a first substrate 21, a third transparent electrode layer 25, and a third transparent substrate 24. 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. Here, the second transparent electrode layer 22 can be completely disposed on the surface 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 disposed on Between the third transparent substrate 24 and the second transparent electrode layer 22. The material of the third transparent substrate 24 may be plastic or glass, and has a plurality of second conductive holes 241 penetrating through the third transparent substrate 24. In addition, the aforementioned “comprehensiveness” means that the second transparent electrode layer 22 includes a common electrode on the entire surface, and this common electrode covers most of the surface of the first substrate 21 facing the first cholesteric liquid crystal layer 23. In different embodiments, the second transparent electrode layer 22 may also be disposed on the surface of the first substrate 21 facing the first cholesteric liquid crystal layer 23 at intervals. The present invention is not limited thereto. At this time, the user can write (press) directly on the light incident surface (writing surface) 111 of the micro switch array module 1 to generate a writing track. Alternatively, other film layers may be provided on the light incident surface 111, and a user may write (press) on the film layer to generate a writing track.

In addition, the material of the third transparent electrode layer 25 may be a transparent conductive material or graphene, and is disposed on a surface of the third transparent substrate 24 facing the first cholesteric liquid crystal layer 23 and extends into the second conductive hole 241. The second conductive hole 241 is provided corresponding to the first conductive hole 133. In this way, when the micro switch array module 1 and the first cholesterol liquid crystal module 2 are superimposed on each other through the second transparent substrate 13 and the third transparent substrate 24, and the electrical connection is made so that the third transparent electrode layer 25 can be It is electrically connected to the corresponding first transparent electrode layer 14 through the second conductive hole 241 and the corresponding first conductive hole 133. In some embodiments, the first conductive hole 133 and the corresponding second conductive hole 241 can be electrically connected through an electrical connection pad (not shown). In this way, the micro switch array module 1 and the first cholesteric liquid crystal can also be electrically connected. After the modules 2 are superposed on each other, the micro switch array module 1 is used to control the display of the first cholesterol liquid crystal module 2. In some embodiments, the micro switch array module 1 and the first cholesteric liquid crystal module 2 may be adhered with an adhesive material to enhance the structural stability.

In FIG. 2B, the third transparent substrate 24 is disposed opposite to the first substrate 21, and the first cholesteric liquid crystal layer 23 has a plurality of cholesteric liquid crystal molecules (not shown), which can be filled and disposed on the third substrate. Between the light-transmitting substrate 24 and the first substrate 21. In addition, the micro-switch electronic writing board E may further include a sealing layer (not shown). The sealing layer may be a frame sealant and disposed between the third transparent substrate 24 and the first substrate 21 to seal the third transparent substrate. The outer periphery of the substrate 24 and the first substrate 21 allows a gap between the third transparent substrate 24 and the first substrate 21. That is, an accommodating 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 accommodating space to form the first cholesteric liquid crystal layer 23. The first cholesteric liquid crystal layer 23 in this embodiment includes a plurality of liquid crystal control regions 231, and each of the liquid crystal control regions 231 is respectively corresponding to each micro switch unit 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 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 cholesterol 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, and / or the second transparent electrode layer 22 in this embodiment may be a transparent conductive material (such as ITO or IZO) or graphene, which is not limited in the present invention.

In this embodiment, the first light-transmitting substrate 11 may be a flexible light-transmitting substrate, and the first light-transmitting substrate 11, the second light-transmitting substrate 13 and the first substrate 21 may be light-transmitting substrates, and the materials thereof may be respectively It is plastic or glass. When the first transparent substrate 11 is a glass substrate, its thickness may be between 0.1 mm and 0.35 mm (0.1 mm ≦ d ≦ 0.35 mm), so that the first transparent substrate 11 has a bendable characteristic. Specifically, generally thick glass substrates (for example, 0.5 mm to 1.5 mm) have high hardness and are difficult to bend or deform due to pressing. However, if the first transparent substrate 11 is used, the thickness is only between 0.1 mm and 0.35 mm. If it is made of glass, it can be flexible and can be pressed and written. In some embodiments, the first light-transmissive substrate 11 may be thinned to a thickness of between 0.1 mm and 0.35 mm by using a chemical mechanical planarization (CMP) process, for example, without limitation. 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 display.

In this embodiment, the first substrate 21 may be a transparent substrate or an opaque substrate. When the first substrate 21 is an opaque substrate, it will absorb or reflect entering through the light incident surface 111 and pass through the micro switch array module 1, the third transparent substrate 24, the third transparent electrode layer 25, and the first cholesterol. Light emitted from the liquid crystal layer 23 and the second transparent electrode layer 22. When the first substrate 21 can be a light-transmitting substrate, A light exit surface 212 of a substrate 21 is provided with a back plate, which may be a black light absorption plate or include a light absorption layer, or a white light reflection plate or include a light reflection layer. Thereby, the micro-switch electronic writing board E becomes a blackboard or a white board.

The first cholesterol liquid crystal module 2 can display a color correspondingly. Specifically, the micro-switch electronic writing board E can add different amounts of optically active agents to the first cholesterol liquid crystal layer 23 of the first cholesterol liquid crystal module 2 to formulate, for example, red (R), green (G), or Blue (B) and other colors. Here, the color displayed by the first cholesterol liquid crystal module 2 can be selected from, for example, but not limited to, one of red, green, and blue, or other colors of visible light. Because cholesteric liquid crystals achieve a special arrangement structure by adding optically active agents to nematic liquid crystals, and the use of cholesteric liquid crystal molecules can exhibit at least a focal conic state under different voltage differences, physical pressures and / or temperatures. , Planar state and homeotropic state, and several different steady states or transient states, in order to achieve the display or clear effect. Therefore, by changing the axial direction of the helical structure of the cholesteric liquid crystal, the reflected partial light and / or part of the light can pass through the cholesteric liquid crystal. That is, the display, writing, and even wiping functions of the micro-switch electronic writing board E can be achieved by the different light reflectance or transmittance of the cholesterol liquid crystal molecules in different states.

To achieve display control, a voltage control circuit 4 can be further provided in the micro-switch electronic writing board E, which is electrically connected to the micro-switch array module 1 and the first cholesterol liquid crystal module 2 respectively. Specifically, 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 cholesterol liquid crystal module 2 respectively. When the micro switch unit 10 is pressed by the writing pen P (or a user's finger) and the transparent conductive layer 12 is brought into contact with the first transparent electrode layer 14, thereby making the micro switch unit 10 conductive, the voltage control circuit 4 pairs the micro switch unit. The first voltage V1 transmitted by the transparent conductive layer 12 of 10 can be transmitted to the first transparent electrode layer 14 thereby to cause the cholesterol liquid crystal molecules of the corresponding first cholesterol liquid crystal layer 23 to change states, and accordingly display the writing track or wipe. Writing tracks. The following briefly describes the display of the writing track (writing mode) and the wiping writing track (wiping mode) by the micro-switch electronic writing board E, respectively. The switching between the writing mode and the wiping mode (and / or the full erasing mode) can be performed by the user by pressing a switch button (not shown) on the micro-switch electronic writing board E.

For example, if a user wants to write on the micro-switch electronic writing board E to generate a writing track, he can select a writing mode.

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 cone 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 the first cholesteric liquid crystal layer 23, and a small part of the incident light will be scattered, so the user will see the micro-switching electrons. The background color of the writing tablet E, for example, black.

When a user writes on the micro-switch electronic writing board E with a finger, a stylus pen P, or other hard object, the corresponding micro-switch unit 10 is pressed to make the transparent conductive layer 12 contact the first transparent electrode layer 14 and conduct. The voltage control circuit 4 can transmit the first voltage V1 to the first conductive via the transparent conductive layer 12, the first transparent electrode layer 14, the first conductive hole 133, and the second conductive hole 241 electrically connected to the first conductive hole 133 in this order. The third transparent electrode layer 25 on the lower surface 242 of the three transparent substrates 24. The voltage control circuit 4 may also transmit a second voltage V2 (for example, a common voltage, such as but not limited to 0 volts) to the second transparent electrode layer 22. At this time, the first voltage V1 minus the second voltage V2 is equal to the writing voltage. The electric field generated by the voltage difference (V1-V2) between the third transparent electrode layer 25 and the second transparent electrode layer 22 will force the corresponding cholesteric liquid crystal molecules of the first cholesteric liquid crystal layer 23 to transition from a focal cone state to a planar state. At this time, the incident light at the pressing portion undergoes Bragg reflection, and the reflected light (having a specific wavelength) is emitted from the light incident surface 111. At the same time, the micro-switch electronic writing board E will display the color of the reflected light at the pressing point, thereby displaying the writing track. The writing track will show the color corresponding to the first cholesterol liquid crystal module 2 (such as the aforementioned red or green). That is, if the user writes characters or draws a pattern on the micro-switch electronic writing board E, the micro-switch electronic writing board E will display a writing track with a corresponding color.

On the other hand, if the user wants to wipe the existing writing track on the micro-switch electronic writing board E, he can select the wiping mode (can be wiped partially or completely). Here, the first voltage V1 supplied by the voltage control circuit 4 minus the second voltage V2 is equal to the wiping voltage. When the user presses (back and forth) on the writing track to be wiped with the writing pen P or other wiping tool, the micro switch unit 10 corresponding to the wiping place at this time will cause the transparent conductive layer 12 of the micro switch unit 10 and The first transparent electrode layer 14 is in contact with each other and is turned on. At this time, the first voltage V1 transmitted from the voltage control circuit 4 to the transparent conductive layer 12 is also electrically connected through the transparent conductive layer 12, the first transparent electrode layer 14, the first conductive hole 133, and the first conductive hole 133 in this order. The second conductive hole 241 is transmitted to the lower surface 242 of the third transparent substrate 24 The third transparent electrode layer 25. 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 will force the corresponding cholesteric liquid crystal molecules to transition from a planar state to a focal cone arrangement. At this time, most of the incident light can pass through the first transparent substrate 11, the second transparent substrate 13, the third transparent substrate 24 and penetrate the first cholesteric liquid crystal layer 23 at the wiping place. The background color of the micro-switch electronic writing board E will be seen, thereby clearing the writing track at the wipe position.

Since the structure of the micro switch array module 1 is relatively simple, the manufacturing cost is relatively low. Moreover, if it is to be made into a micro switch electronic writing board E, the micro switch array module 1 and the first cholesterol liquid crystal module 2 of this embodiment only need to be superimposed on each other without precise positioning, and it can control the first The manufacturing process of the display of the cholesterol liquid crystal module 2 is also quite simple. Therefore, the micro switch array module 1 of this embodiment has a relatively simple structure, a relatively low manufacturing cost, and is convenient for making other electronic display devices such as an electronic writing board.

Second embodiment

In addition, please refer to FIG. 3A and FIG. 3B, which are schematic structural diagrams of a micro switch array module according to another embodiment of the present invention, and a micro switch array module and a cholesterol liquid crystal module shown in FIG. 3A. Schematic diagram of the micro switch electronic writing board.

The micro switch array module 1 of this embodiment is substantially the same as the micro switch array module described in the previous embodiment. The main difference is that, as shown in FIG. 3A, in the micro switch array module 1 of this embodiment, the first transparent electrode layer 14 is disposed on the first surface 131 of the second transparent substrate 13 and passes through the first A conductive hole 133 extends to the second surface 132 of the second light-transmitting substrate 13 to form corresponding first and transparent electrode layers 14 disposed on the second surface 132 and spaced apart from each other. Therefore, when the transparent conductive layer 12 is pressed down toward the first transparent electrode layer 14 and contacts the first transparent electrode layer 14, the micro switch unit 10 is turned on, and electrical signals can pass through the transparent conductive layer of the micro switch unit 10. 12 is transferred to the first transparent electrode layer 14, and is transferred to the first transparent electrode layer 14 on the second surface 132 of the second transparent substrate 13 through the first conductive hole 133.

In addition, the other components of the micro-switch array module 1 of this embodiment, the connection relationships of other components, and the changes and the like are the same as those in the previous embodiment, and are not described herein again.

Please refer to FIG. 3B again, which is a schematic structural diagram of a micro-switch electronic writing board composed of the micro-switch array module and the cholesterol liquid crystal module shown in FIG. 3A. As shown in FIG. 3B, the micro switch array module Group 1 and a first cholesterol liquid crystal module 2 form a micro-switch electronic writing board E. The composition and operation of the micro-switch electronic writing board E and the first cholesterol liquid crystal module 2 mentioned in this embodiment are substantially the same as those of the previous embodiment. The difference is that, as shown in FIG. 3B, the first cholesteric liquid crystal module 2 includes only a first cholesteric liquid crystal layer 23, a second transparent electrode layer 22, and a first substrate 21. In addition, the second transparent substrate 13 is disposed opposite to the first substrate 21, and the first cholesteric liquid crystal layer 23 is filled and disposed between the second transparent substrate 13 and the first substrate 21.

Similarly, when the micro switch unit 10 is pressed by the writing pen P (or a user's finger), the transparent conductive layer 12 is brought into contact with the first transparent electrode layer 14 and the micro switch unit 10 is made conductive, the voltage control circuit 4 pairs The first voltage V1 transmitted from the transparent conductive layer 12 of the micro-switching unit 10 can be transmitted to the first transparent electrode layer 14 to cause the cholesterol liquid crystal molecules of the corresponding first cholesterol liquid crystal layer 23 to change state, and accordingly display the writing Track or wipe writing track.

The following briefly describes the display of the writing track (writing mode) and the wiping writing track (wiping mode) by the micro-switch electronic writing board E, respectively. The switching between the writing mode and the wiping mode (and / or the full erasing mode) can be performed by the user by pressing a switch button (not shown) on the micro-switch electronic writing board E.

In the writing mode, when a user uses a finger, a stylus P, or other hard object to write on the micro switch electronic writing board E, the corresponding micro switch unit 10 is pressed to make the transparent conductive layer 12 and the first transparent electrode layer 14 contact and conduct. The voltage control circuit 4 can transmit the first voltage V1 to the first transparent electrode layer 14 on the lower surface 132 of the second transparent substrate 13 through the transparent conductive layer 12, the first transparent electrode layer 14, and the first conductive hole 133 in this order. . The voltage control circuit 4 may also transmit a second voltage V2 (for example, a common voltage, such as but not limited to 0 volts) to the second transparent electrode layer 22. At this time, the first voltage V1 minus the second voltage V2 is equal to the writing voltage. The electric field generated by the voltage difference (V1-V2) between the first transparent electrode layer 14 and the second transparent electrode layer 22 will force the cholesteric liquid crystal molecules of the corresponding first cholesteric liquid crystal layer 23 to transition from a focal cone state to a planar state. At this time, the incident light at the pressing portion undergoes Bragg reflection, and the reflected light (having a specific wavelength) is emitted from the light incident surface 111. At the same time, the micro-switch electronic writing board E will display the color of the reflected light at the pressing point, thereby displaying the writing track. The writing track will show the color corresponding to the first cholesterol liquid crystal module 2 (such as the aforementioned red or green). That is, if a user writes text or draws a pattern on the micro-switch electronic writing board E, The micro switch electronic writing board E will be made to display the writing track with the corresponding color.

On the other hand, when the user wants to wipe the existing writing track on the micro-switch electronic writing board E, the user can select a wiping mode (can be wiped partially or completely). Here, the first voltage V1 supplied by the voltage control circuit 4 minus the second voltage V2 is equal to the wiping voltage. When the user presses (back and forth) on the writing track to be wiped with the writing pen P or other wiping tool, the micro switch unit 10 corresponding to the wiping place at this time will cause the transparent conductive layer 12 of the micro switch unit 10 and The first transparent electrode layer 14 is in contact with each other and is turned on. At this time, the first voltage V1 transmitted from the voltage control circuit 4 to the transparent conductive layer 12 is also transmitted to the second transparent substrate 13 through the transparent conductive layer 12, the first transparent electrode layer 14, and the first conductive hole 133 in this order. The first transparent electrode layer 14 on the second surface 132. 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 will force the corresponding cholesteric liquid crystal molecules to transition from a planar state to a focal conical state. At this time, at the wipe position, most of the incident light can pass through the first transparent substrate 11 and the second transparent substrate 13 and penetrate the first cholesteric liquid crystal layer 23, so the user will see the micro switch electronic writing at the wipe position The background color of the plate E, thereby clearing the writing track of the wipe.

In conclusion, since the structure of the micro switch array module is relatively simple, the manufacturing cost is relatively low. Moreover, if it is to be made into a micro switch electronic writing board, the micro switch array module and the first cholesterol liquid crystal module of this embodiment only need to be superimposed on each other without precise positioning, and it can control the first cholesterol liquid crystal module. The display of the group is also quite simple. Therefore, the micro switch array module of this embodiment has a relatively simple structure, a relatively low manufacturing cost, and is convenient for making other electronic display devices such as an electronic writing board.

The above description is exemplary only, and not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the attached patent application.

Claims (9)

A micro switch electronic writing board includes: a micro switch array module having a plurality of micro switch units arranged in an array, each of the micro switch units including: a first light-transmitting substrate having a light incident surface; and a transparent conductive layer Is disposed on a surface of the first transparent substrate facing away from 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 The second transparent substrate has a first conductive hole penetrating one of the first surface and the second surface; a first transparent electrode layer is disposed on the first surface of the second transparent substrate and extends to the first surface; A conductive hole; and at least one spacer disposed between the first transparent substrate and the second transparent substrate; and a cholesterol liquid crystal module including: a substrate; a second transparent electrode layer disposed on A surface of the substrate; a cholesteric liquid crystal layer; and a third transparent electrode layer, the cholesteric liquid crystal layer is disposed between the second transparent electrode layer and the third transparent electrode layer; wherein the third transparent electrode layer passes through the First conductive hole Connected to the first transparent electrode layer electrically. The micro switch electronic writing board according to item 1 of the scope of patent application, wherein the cholesterol liquid crystal module further includes: a third transparent substrate, the third transparent electrode layer is disposed on the third transparent substrate, and the third The light-transmitting substrate has a second conductive hole penetrating through the third light-transmitting substrate, and the third transparent electrode layer is extended into the second conductive hole; wherein the second conductive hole is disposed corresponding to the first conductive hole, The third transparent electrode layer is electrically connected to the corresponding first transparent electrode layer through the second conductive hole and the corresponding first conductive hole. The micro switch electronic writing board according to item 1 or 2 of the patent application scope, wherein the first transparent electrode layer is extended to the second surface of the second transparent substrate through the first conductive hole. The micro switch electronic writing board according to item 1 or 2 of the patent application scope, wherein the first The material of the transparent substrate is plastic or glass. The micro switch electronic writing board according to item 1 or 2 of the scope of patent application, wherein the material of the second transparent substrate is plastic or glass. The micro switch electronic writing board according to item 1 or 2 of the patent application scope, wherein the first transparent substrate is a glass substrate, and the thickness of the glass substrate is between 0.1 mm and 0.35 mm. The micro switch electronic writing board according to item 1 or 2 of the scope of patent application, wherein the material of the transparent conductive layer is a transparent conductive material or graphene. The micro switch electronic writing board according to item 1 or 2 of the patent application scope, wherein a material of the first transparent electrode layer is a transparent conductive material or graphene. The micro switch electronic writing board according to item 1 or 2 of the scope of patent application, which is made into a curved writing board or display.