Electromagnetic local wiping liquid crystal handwriting device

Abstract

The utility model discloses an electromagnetic local wiping liquid crystal handwriting device which comprises an electromagnetic layer, a first conducting layer, a liquid crystal layer, a third conducting layer and a substrate which are sequentially laminated, the electromagnetic layer circuit board is arranged at the bottom of the substrate, and the electromagnetic layer circuit board is electrically connected with the electromagnetic layer; the liquid crystal layer circuit board is arranged at the bottom of the substrate, the liquid crystal layer circuit board is electrically connected with the liquid crystal layer, and the electromagnetic layer circuit board is further electrically connected with the liquid crystal layer circuit board. According to the electromagnetic local erasing liquid crystal handwriting device, the electromagnetic layer is arranged on the liquid crystal film, so that the electromagnetic layer can be in direct contact with a pen, positioning is more accurate, and meanwhile, the liquid crystal layer can be protected from being damaged easily.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal handwriting devices, in particular to an electromagnetic local erasing liquid crystal handwriting device. Background Art

[0002] The existing liquid crystal handwriting devices apply pressure to the liquid crystal layer, causing the liquid crystal molecules in the liquid crystal layer to rotate and change the transmittance, forming a contrast with the liquid crystal molecules next to them that have not rotated, thereby forming handwriting. Applying voltage on both sides of the liquid crystal layer will drive all the liquid crystal molecules in the liquid crystal layer to flip, thus achieving the effect of erasing handwriting. In order to achieve the erasing of local handwriting, an electromagnetic layer is set up, and a pen that can emit electromagnetic waves is used. After being sensed by the neatly arranged sensors on the electromagnetic layer, the position of the pen is calculated and the position coordinates are transmitted to the MCU of the liquid crystal film. The MCU provides voltage to the corresponding place, thereby achieving the erasing of the written handwriting. However, the writing devices with electromagnetic layers on the market usually set the electromagnetic layer between the liquid crystal film and the base plate. Such a setting will easily lead to inaccurate positioning and easy damage to the liquid crystal film. Utility Model Content

[0003] The main purpose of the utility model is to provide an electromagnetic partial erasing liquid crystal handwriting device, which can accurately locate the position of the pen, realize partial erasing, and ensure the durability of the liquid crystal film.

[0004] To achieve the above-mentioned purpose, the utility model proposes an electromagnetic partial-erasable liquid crystal handwriting device, comprising: an electromagnetic layer, a first conductive layer, a liquid crystal layer, a third conductive layer and a substrate stacked in sequence; an electromagnetic layer circuit board, the electromagnetic layer circuit board is arranged at the bottom of the substrate, the electromagnetic layer circuit board is electrically connected to the electromagnetic layer; a liquid crystal layer circuit board, the liquid crystal layer circuit board is arranged at the bottom of the substrate, the liquid crystal layer circuit board is electrically connected to the liquid crystal layer, and the electromagnetic layer circuit board is also electrically connected to the liquid crystal layer circuit board.

[0005] Preferably, an adhesive layer is further included, and the adhesive layer is arranged between the third conductive layer and the substrate.

[0006] Preferably, the electromagnetic layer comprises a metal wire grid and an insulating layer, and the metal wire grid is arranged on a side of the insulating layer away from the first conductive layer.

[0007] Preferably, the electromagnetic layer is transparent.

[0008] Preferably, it further comprises a Bluetooth module, which is arranged at the bottom of the substrate and is electrically connected to the electromagnetic layer circuit board and the liquid crystal layer circuit board respectively.

[0009] Preferably, the liquid crystal material of the liquid crystal layer is bistable liquid crystal.

[0010] Preferably, it further comprises a power supply device, which is arranged at the bottom of the substrate and is electrically connected to the electromagnetic layer circuit board and the liquid crystal layer circuit board respectively.

[0011] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0012] The electromagnetic partial erasure liquid crystal handwriting device proposed in the present application can obtain the position of the pen on the X and Y axes of the handwriting device by setting an electromagnetic layer, and realize the partial erasing function by transmitting the position information to the liquid crystal layer circuit board. By setting the electromagnetic layer on the liquid crystal film, the electromagnetic layer can be in direct contact with the pen, thereby making the positioning more accurate and protecting the liquid crystal layer from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural stacking diagram of the electromagnetic local erasable liquid crystal handwriting device of the utility model;

[0014] Figure 2 This is a working flow chart of the electromagnetic erasable liquid crystal handwriting device of the utility model;

[0015] Figure 3 It is a cross-sectional schematic diagram of the electromagnetic layer of the utility model;

[0016] Figure 4 This is the circuit diagram of the first conductive layer of the utility model;

[0017] Figure 5 This is a circuit diagram of the second conductive layer of the present invention.

[0018] Description of Figure Numbers

[0019] 100 electromagnetic layer, 110 metal wire grid, 120 insulating layer; 200 first conductive layer; 300 liquid crystal layer; 400 third conductive layer; 500 substrate; 600 electromagnetic layer circuit board; 700 liquid crystal layer circuit board; 800 adhesive layer; 900 Bluetooth module; 1100 power supply device. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0023] Please refer to Figures 1 to 5 The utility model proposes an electromagnetic partial erasure liquid crystal handwriting device, comprising: an electromagnetic layer 100, a first conductive layer 200, a liquid crystal layer 300, a third conductive layer 400 and a substrate 500 which are stacked in sequence, preferably, the first conductive layer 200 and the third conductive layer 400 are transparent ITO films, preferably, the substrate 500 is a black plate; an electromagnetic layer circuit board 600, the electromagnetic layer circuit board 600 is arranged at the bottom of the substrate 500, and the electromagnetic layer circuit board 600 is electrically connected to the electromagnetic layer 100; a liquid crystal layer circuit board 700, the liquid crystal layer circuit board 700 is arranged at the bottom of the substrate 500, the liquid crystal layer circuit board 700 is electrically connected to the liquid crystal layer 300, and the electromagnetic layer circuit board 600 is also electrically connected to the liquid crystal layer circuit board 700. The electromagnetic partial erasure liquid crystal handwriting device also includes an adhesive layer 800, the adhesive layer 800 is arranged between the third conductive layer 400 and the substrate 500, and the liquid crystal material of the liquid crystal layer 300 is a bistable liquid crystal.

[0024] In this embodiment, in normal state, the liquid crystals in the liquid crystal layer 300 are arranged neatly, and external light can directly pass through the liquid crystal layer 300 to reflect the color of the substrate 500. Therefore, the electromagnetic local erasure liquid crystal handwriting device is black at this time. By applying pressure to a local position on the liquid crystal layer 300, the liquid crystal in the liquid crystal layer 300 that receives the pressure can be rotated, and part of the light entering the liquid crystal layer 300 can be deflected, thereby changing the light transmittance of the part, and forming a color contrast with the adjacent area where the liquid crystal molecules do not rotate, thereby forming handwriting. When the handwriting needs to be erased, the liquid crystal layer circuit board 700 applies an electric field to the liquid crystal layer 300 to flip all the liquid crystals in the liquid crystal layer 300. By setting the electromagnetic layer 100 on the top of the liquid crystal layer 300, when a pen that can emit electromagnetic waves is used to touch the electromagnetic partial-erasure liquid crystal handwriting device, the electromagnetic layer 100 can sense the electromagnetic waves emitted by the pen, so that the electromagnetic layer circuit board 600 calculates the X and Y axis coordinates of the pen touch position, and the electromagnetic layer circuit board 600 transmits the position information to the liquid crystal layer circuit board 700, and the liquid crystal layer circuit board 700 can apply voltage to the coordinate position corresponding to the liquid crystal layer 300, so as to achieve accurate erasure of handwriting at a local position. The electromagnetic partial-erasure liquid crystal handwriting device sets the electromagnetic layer 100 on the side of the first conductive layer 200 away from the substrate 500, that is, the electromagnetic layer 100 is in direct contact with the pen, so that the positioning of the electromagnetic layer 100 can be more accurate, and it can also protect the liquid crystal layer 300, indicating the service life of the electromagnetic partial-erasure liquid crystal handwriting device.

[0025] Further, the electromagnetic layer 100 includes a metal wire mesh 110 and an insulating layer 120, wherein the metal wire mesh 110 is disposed on a side of the insulating layer 120 away from the first conductive layer 200; and the electromagnetic layer 100 is transparent. Preferably, the metal used for the metal wire mesh 110 is copper, and a transparent copper wire mesh is made by a metal mesh process.

[0026] Furthermore, the electromagnetic partial-erasable liquid crystal handwriting device further comprises a Bluetooth module 900, which is disposed at the bottom of the substrate 500 and is electrically connected to the electromagnetic layer circuit board 600 and the liquid crystal layer circuit board 700, respectively.

[0027] In this embodiment, by providing a Bluetooth module 900, the electromagnetic indirect erasure liquid crystal handwriting device can be electrically connected to an external computer display screen, so that the notes on the electromagnetic indirect erasure liquid crystal handwriting device can be displayed on a larger screen for more people to watch.

[0028] Furthermore, the electromagnetic partial erasure liquid crystal handwriting device further comprises a power supply device 1100, which is disposed at the bottom of the substrate 500 and is electrically connected to the electromagnetic layer circuit board 600 and the liquid crystal layer circuit board 700. By arranging the power supply device 1100 on the electromagnetic partial erasure liquid crystal handwriting device, electric energy is provided for the operation of the electromagnetic layer circuit board 600 and the liquid crystal layer circuit board 700 of the electromagnetic partial erasure liquid crystal handwriting device.

[0029] It should be noted that the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. An electromagnetic local erasable liquid crystal handwriting device, characterized in that: include: An electromagnetic layer (100), a first conductive layer (200), a liquid crystal layer (300), a third conductive layer (400), and a substrate (500) are sequentially stacked; an electromagnetic layer circuit board (600), the electromagnetic layer circuit board (600) being arranged at the bottom of the substrate (500), the electromagnetic layer circuit board (600) being electrically connected to the electromagnetic layer (100); and a liquid crystal layer circuit board (700), the liquid crystal layer circuit board (700) being arranged at the bottom of the substrate (500), the liquid crystal layer circuit board (700) being electrically connected to the liquid crystal layer (300), and the electromagnetic layer circuit board (600) being also electrically connected to the liquid crystal layer circuit board (700).

2. The electromagnetic partial erasure liquid crystal handwriting device according to claim 1, characterized in that: The electromagnetic partial-erasure liquid crystal handwriting device further comprises an adhesive layer (800), wherein the adhesive layer (800) is arranged between the third conductive layer (400) and the substrate (500).

3. The electromagnetic partial erasure liquid crystal handwriting device according to claim 1, characterized in that: The electromagnetic layer (100) comprises a metal wire grid (110) and an insulating layer (120), wherein the metal wire grid (110) is arranged on a side of the insulating layer (120) away from the first conductive layer (200).

4. The electromagnetic partial erasure liquid crystal handwriting device according to claim 1, characterized in that: The electromagnetic layer (100) is in a transparent state.

5. The electromagnetic partial erasure liquid crystal handwriting device according to claim 1, characterized in that: The electromagnetic partial-erasable liquid crystal handwriting device further comprises a Bluetooth module (900), which is arranged at the bottom of the substrate (500) and is electrically connected to the electromagnetic layer circuit board (600) and the liquid crystal layer circuit board (700), respectively.

6. The electromagnetic partial erasure liquid crystal handwriting device according to claim 1, characterized in that: The liquid crystal material of the liquid crystal layer (300) is bistable liquid crystal.

7. The electromagnetic partial erasure liquid crystal handwriting device according to claim 1, characterized in that: The electromagnetic partial-erasure liquid crystal handwriting device further comprises a power supply device (1100), wherein the power supply device (1100) is arranged at the bottom of the substrate (500), and the power supply device (1100) is electrically connected to the electromagnetic layer circuit board (600) and the liquid crystal layer circuit board (700), respectively.

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