CN111999927A - Electronic tablet and handwriting restoration method - Google Patents

Abstract

The invention relates to an electronic handwriting board and a handwriting restoration method. An electronic writing pad comprising: the display layer can generate handwriting at a stressed position under the action of pressure; a piezoelectric material layer laminated with the display layer, the piezoelectric material layer being capable of converting the pressure into an electrical signal; and the control element is electrically connected with the piezoelectric material layer and can apply voltage to the piezoelectric material layer according to the electric signal so that the piezoelectric material layer applies acting force to the display layer at the stress position to restore the handwriting. The electronic handwriting board can solve the problem that the handwriting of the conventional electronic handwriting board cannot be restored again.

Description

Electronic tablet and handwriting restoration method

technical field

The invention relates to the technical field of handwriting boards, in particular to an electronic handwriting board and a method for restoring handwriting.

Background technique

With the development of the field of tablet technology, the application of liquid crystal electronic tablet is more and more extensive. The liquid crystal electronic tablet is provided with a liquid crystal layer. When writing with a stylus, the stylus exerts pressure on the liquid crystal layer to deflect part of the liquid crystal and change the local optical properties of the liquid crystal layer, thereby displaying handwriting on the liquid crystal electronic tablet. At the same time, since the liquid crystal can be deflected under the action of an electric field, applying a restoring electric field to the liquid crystal layer can restore the orientation of the liquid crystal and achieve the effect of erasing handwriting.

However, in the current liquid crystal electronic tablet, the handwriting cannot be restored after erasing the handwriting, which affects the user experience.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide an electronic handwriting board and a method for restoring handwriting in order to solve the problem that the current liquid crystal electronic handwriting board cannot restore handwriting.

An electronic writing board, comprising:

a display layer capable of generating handwriting at the stressed position under the action of pressure;

a piezoelectric material layer stacked with the display layer, the piezoelectric material layer capable of converting the pressure into an electrical signal; and

a control element, electrically connected to the piezoelectric material layer, the control element can apply a voltage to the piezoelectric material layer according to the electrical signal, so that the piezoelectric material layer can be used for the display at the stressed position The layer applies a force to restore the handwriting.

In one of the embodiments, the piezoelectric material layer includes a first piezoelectric layer and a second piezoelectric layer arranged in a stack, the first piezoelectric layer includes a plurality of first piezoelectric units arranged at intervals, the The second piezoelectric layer includes a plurality of second piezoelectric units arranged at intervals, and the first piezoelectric units intersect with the second piezoelectric units.

In one of the embodiments, the first piezoelectric units extend along a first direction, a plurality of the first piezoelectric units are sequentially spaced along a second direction, and the second piezoelectric units are along the second direction Extending, a plurality of the second piezoelectric units are sequentially spaced along the first direction, and the first direction and the second direction are two orthogonal directions parallel to the plane of the display layer.

In one embodiment, each of the first piezoelectric units is orthogonal to all of the second piezoelectric units, and each of the second piezoelectric units is orthogonal to all of the first piezoelectric units .

In one embodiment, the minimum distance between two adjacent first piezoelectric units is less than or equal to 0.5mm, and the minimum distance between two adjacent second piezoelectric units is less than or equal to 0.5mm .

In one of the embodiments, the control element includes a first control unit and a second control unit, and the first control unit is electrically connected to all the first piezoelectric units, so as to control any one of the first piezoelectric units. The electric unit applies a voltage, and the second control unit is electrically connected to all the second piezoelectric units to apply a voltage to any one of the second piezoelectric units.

In one of the embodiments, it further includes a light-absorbing backplane, the material of the display layer is a liquid crystal material, and the piezoelectric material layer and the display layer are sequentially stacked on the light-absorbing backplane; and/or

The electronic tablet further includes an insulating cover plate, the insulating cover plate covers the side of the display layer away from the piezoelectric material layer, and the insulating cover plate can act on the insulating cover plate away from the display. The pressure on the layer side is transmitted to the display layer and the piezoelectric material layer.

A handwriting restoration method, comprising the following steps:

An electronic tablet is provided, the electronic tablet includes a display layer, a piezoelectric material layer and a control element, the display layer and the piezoelectric material layer are stacked and arranged, and the control element is electrically connected to the piezoelectric material layer;

Writing handwriting, applying pressure to the surface of the display layer away from the piezoelectric material layer, so that the display layer produces handwriting, and the piezoelectric material layer converts the pressure into an electrical signal and transmits it to the control element;

erasing said handwriting; and

Restoring the handwriting, the control element applies a voltage to the piezoelectric material layer according to the electrical signal, so that the piezoelectric material layer exerts a force on the display layer at the force position, so as to restore the handwriting .

In one of the embodiments, the piezoelectric material layer includes a first piezoelectric layer and a second piezoelectric layer arranged in a stack, the first piezoelectric layer includes a plurality of first piezoelectric units arranged at intervals, the The second piezoelectric layer includes a plurality of second piezoelectric units arranged at intervals, and the first piezoelectric units intersect with the second piezoelectric units to form intersections;

In the written handwriting, the pressure is transmitted to the intersection at the force location;

In the restoration of the handwriting, the control element applies a voltage to the first piezoelectric unit and the second piezoelectric unit corresponding to the intersection at the force-receiving position.

In one of the embodiments, the display layer comprises a liquid crystal material, and in the written handwriting, the pressure diverts a portion of the liquid crystal material to form the handwriting;

The display layer has a turning threshold, and when the force on the display layer is greater than the turning threshold, the display layer forms the handwriting;

In the restoration handwriting, the force exerted by one of the first piezoelectric units or the one of the second piezoelectric units on the display layer is smaller than the turning threshold, and the first pressure corresponding to one of the intersection points The force exerted by the electric unit and the second piezoelectric unit on the display layer is greater than the turning threshold.

In the above electronic tablet, by arranging a piezoelectric material layer and a control element, when the display layer forms handwriting under the action of pressure, the piezoelectric material layer can convert the pressure into an electrical signal and transmit it to the control element , to record the force position, that is, record the handwriting. When the handwriting needs to be restored, the control element can apply a voltage to the piezoelectric material layer according to the electrical signal, so that the piezoelectric material layer applies a voltage to the display layer at the stress position, so that the display layer can form the handwriting again at the stress position. Therefore, the above-mentioned electronic tablet can solve the problem that the current electronic tablet cannot restore handwriting.

Description of drawings

1 is a schematic diagram of handwriting formed by an electronic tablet in some embodiments of the present application;

2 is a schematic diagram of an electronic handwriting tablet erasing handwriting in some embodiments of the present application;

3 is a schematic diagram of a first piezoelectric layer and a second piezoelectric layer in some embodiments of the present application;

4 is a schematic diagram of rectangular and horizontal handwriting formed by an electronic tablet in some embodiments of the present application;

5 is a schematic diagram of a process of restoring handwriting by a piezoelectric material layer in some embodiments of the present application;

FIG. 6 is a schematic diagram of handwriting restored by a piezoelectric material layer in some embodiments of the present application.

110, light absorbing backplane; 120, display layer; 130, insulating cover plate; 140, writing pen; 150, piezoelectric material layer; 151, first piezoelectric layer; 152, first piezoelectric unit; 153, No. Two piezoelectric layers; 154, a second piezoelectric unit; 160, a control element; 161, a first control unit; 162, a second control unit; 170, a first direction; 180, a second direction.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 shows a schematic diagram of handwriting formed by an electronic tablet in some embodiments of the present application, and FIG. 2 is a schematic diagram of an electronic tablet in some embodiments of the present application erasing handwriting. The electronic tablet can be used for writing with the writing pen 140 to form handwriting. For example, the writing pen 140 is used to write and form handwriting such as characters, numbers, symbols, graphics, etc. on the electronic tablet for recording or drafting.

Specifically, in some embodiments, the electronic tablet includes a light-absorbing backplane 110 , a display layer 120 and an insulating cover plate 130 that are stacked in sequence. The surface of the light-absorbing backplane 110 facing the display layer 120 can absorb visible light, that is, the light-absorbing backplane 110 The side facing the display layer 120 appears black. The insulating cover plate 130 covers the display layer 120 to protect the display layer 120 . The insulating cover plate 130 has a certain flexibility. When the writing pen 140 is used to write the electronic tablet, the writing pen 140 exerts pressure on the insulating cover plate 130 on the surface of the insulating cover plate 130 away from the display layer 120 , and the portion of the insulating cover plate 130 under pressure occurs. Deformed to transmit pressure to the display layer 120 to form handwriting. The material of the display layer 120 may be any suitable material capable of generating handwriting at a force position under the action of pressure. For example, in some embodiments, the material of the display layer 120 is a liquid crystal material.

Referring to FIG. 2 , the liquid crystal material in the display layer 120 has the same orientation when not writing, so that the display layer 120 has high light transmittance. The light entering the electronic tablet passes through the display layer 120 and is absorbed by the light-absorbing backplane 110 . That is, the electronic tablet appears black when not writing. Referring to FIG. 1 , when the writing pen 140 writes on the insulating cover plate 130 , the pressure of the writing pen 140 on the insulating cover plate 130 is transmitted to the display layer 120 , so that the orientation of the liquid crystal material of the display layer 120 at the stressed position changes. , so that the light transmittance of the display layer 120 at the stress position is reduced, and the reflectance is increased. Therefore, the light entering the electronic tablet is reflected by the display layer 120 at the stressed position, showing the color of the light itself, and the color of the light is contrasted with the black color of the rest of the electronic tablet, that is, handwriting is formed.

It can be understood that the direction of the liquid crystal material can be deflected with the electric field. In some embodiments, when the handwriting of the electronic tablet needs to be erased, a voltage can be applied to both sides of the display layer 120, so that the liquid crystal material of the display layer 120 is oriented. When the pointing is deflected to the state when it is not written, the handwriting can be erased, so that the electronic handwriting tablet appears black as the light-absorbing backplane 110 . It should be noted that, in the present application, the stylus exerts force on the electronic tablet, and the force position of the electronic tablet is described, and is not limited to the contact position between the insulating cover plate 130 and the stylus. Since the pressure of the stylus on the insulating cover plate 130 can be transmitted to the display layer 120 and even the light-absorbing backplane 110 through the insulating cover plate 130 , the parts of the components of the electronic writing tablet are opposite to the contact positions of the insulating cover plate 130 and the stylus. It can be understood as the force-bearing position of the electronic tablet, for example, the force-bearing position of the display layer 120 is the portion of the display layer 120 opposite to the contact position of the insulating cover 130 and the stylus.

Further, in some embodiments, the electronic tablet further includes a piezoelectric material layer 150 and a control element 160 . The material of the piezoelectric material layer 150 may be a piezoelectric material such as polyvinylidene fluoride (PVDF), lead zirconate titanate piezoelectric ceramic (PZT). The piezoelectric material layer 150 has a piezoelectric effect and can convert mechanical energy into electrical energy, or convert electrical energy into mechanical energy. The piezoelectric material layer 150 is disposed between the display layer 120 and the light-absorbing backplane 110 . For example, the piezoelectric material layer 150 and the display layer 120 are sequentially stacked on the light-absorbing backplane 110 . The display layer 120 plays a supporting role. The control element 160 is electrically connected to the piezoelectric material layer 150 and can receive and store the electrical energy generated by the piezoelectric material layer 150 . The control element 160 can be disposed on the light-absorbing backplane 110 or outside the light-absorbing backplane 110, and is electrically connected to the piezoelectric material layer 150 through wires. The control element 160 may be an integrated circuit chip (IC chip).

Specifically, when the writing pen 140 exerts pressure on the insulating cover plate 130 to make the display layer 120 generate handwriting, the pressure is transmitted to the piezoelectric material layer 150 through the display layer 120 , that is, the display layer 120 presses the piezoelectric material layer at the stress position. 150 transmits mechanical energy. The portion of the piezoelectric material layer 150 located at the stressed position converts mechanical energy into electrical energy, and the electrical energy forms an electrical signal carrying the stressed position information and is transmitted to the control element 160 for storage by the control element 160 . After erasing the handwriting, to restore the handwriting, the control element 160 can apply a voltage to the portion of the piezoelectric material layer 150 at the stress position according to the electrical signal formed by the piezoelectric material layer 150 . The piezoelectric material layer 150 converts electrical energy into mechanical energy, that is, the piezoelectric material layer 150 exerts a force on the display layer 120 at the stressed position, changing the orientation of the liquid crystal material of the display layer 120 at the stressed position, thereby realizing the restoration of handwriting . Therefore, the above-mentioned electronic tablet can solve the problem that the current electronic tablet cannot restore handwriting.

The arrangement of the piezoelectric material layer 150 is not limited, as long as the pressure of the writing pen 140 can be converted into an electrical signal carrying the force position information and transmitted to the control element 160 , and the electrical energy output by the control element 160 can be converted into mechanical energy for the display layer 120 . Just apply force. Referring to FIG. 1 and FIG. 3 together, in some embodiments, the piezoelectric material layer 150 includes a first piezoelectric layer 151 and a second piezoelectric layer 153 arranged in layers, and the first piezoelectric layer 151 includes a plurality of piezoelectric layers arranged at intervals. The first piezoelectric unit 152 and the second piezoelectric layer 153 include a plurality of second piezoelectric units 154 arranged at intervals, and the first piezoelectric units 152 intersect with the second piezoelectric units 154 . It can be understood that, for the convenience of describing the structure of the piezoelectric material layer 150, in the embodiment shown in FIG. 3, the first piezoelectric layer 151 is separated from the second piezoelectric layer 153, while in the electronic tablet, the A piezoelectric layer 151 and a second piezoelectric layer 153 should be stacked on the light-absorbing backplane 110, and the order of the placement is not limited. The first piezoelectric layer 151 can be closer to the display layer 120 than the second piezoelectric layer 153, and the second piezoelectric layer 151 The piezoelectric layer 153 may also be closer to the display layer 120 than the first piezoelectric layer 151 .

Correspondingly, in some embodiments, the control element 160 includes a first control unit 161 and a second control unit 162, the first control unit 161 is electrically connected to all the first piezoelectric units 152, and each first piezoelectric unit A separate electrical circuit is formed between 152 and the first control unit 161 . The second control unit 162 is electrically connected to all the second piezoelectric units 154 , and a separate electrical circuit is formed between each of the second piezoelectric units 154 and the second control unit 162 .

It can be understood that, by arranging the intersecting first piezoelectric unit 152 and the second piezoelectric unit 154, the intersection of the first piezoelectric unit 152 and the second piezoelectric unit 154 forms an intersection point. When the display layer 120 exerts pressure on the piezoelectric material layer 150, both the first piezoelectric unit 152 and the second piezoelectric unit 154 corresponding to the intersection at the stress position can convert the mechanical energy transmitted by the display layer 120 into electrical energy and output it to Control element 160 . Since an independent electrical circuit is formed between each of the first piezoelectric units 152 and each of the second piezoelectric units 154 and the control unit, the electrical energy received by the first control element 160 can be carried through the first piezoelectric element 160 at the stressed position. An electrical signal of the position information of the piezoelectric unit 152 in the first piezoelectric layer 151, the electric energy received by the second control element 160 can form the second piezoelectric unit 154 at the stress position to be carried in the second piezoelectric layer 153 electrical signals for location information. The force position information is formed through the intersection of the first piezoelectric unit 152 and the second piezoelectric unit 154 at the force position. The control element 160 can store the force position information.

When it is necessary to restore the handwriting, the control element 160 applies a voltage to the first piezoelectric unit 152 and the second piezoelectric unit 154 passing through the force-bearing position according to the electrical signal converted by the piezoelectric material layer 150, so as to make the first piezoelectric unit 152 and the second piezoelectric unit 154 at the force-bearing position A voltage is applied to the display layer 120 to deflect the liquid crystal material located at the force position, so as to restore the handwriting. It can be understood that when a voltage is applied to the display layer 120 at the intersection at the stress position, the first piezoelectric unit 152 and the second piezoelectric unit 154 passing through the stress position will also generate mechanical energy due to the action of the voltage. In order to prevent the mechanical energy generated by the first piezoelectric unit 152 and the second piezoelectric unit 154 located outside the force-bearing position from interfering with the handwriting of the display layer 120 , in some embodiments, by setting the piezoelectric material layer 150 , for example, Select a suitable piezoelectric material, and then adjust the piezoelectric constant (D33) of the piezoelectric material, that is, adjust the proportional constant of the piezoelectric material to convert electrical energy into mechanical energy. When a first piezoelectric unit 152 or a second piezoelectric unit 154 is subjected to the voltage of the control element 160, the force exerted on the display layer 120 is smaller than the turning threshold of the display layer 120, and an intersection corresponding to the first piezoelectric unit 152 The force exerted on the display layer 120 by the second piezoelectric unit 154 and the second piezoelectric unit 154 is greater than the turning threshold of the display layer 120 .

The turning threshold of the display layer 120 can be understood as the minimum pressure value for deflecting the direction of the liquid crystal material of the display layer 120 . In other words, when the force on the display layer 120 is greater than the turning threshold, the direction of the liquid crystal material at the force-bearing position is deflected to form handwriting. If the force on the display layer 120 is less than the turning threshold, the force is not enough to make the display layer 120 form handwriting. Therefore, when the control element 160 applies a voltage to the first piezoelectric unit 152 and the second piezoelectric unit 154 passing through the force-bearing position according to the electrical signal, only the intersection point at the force-bearing position exerts a force on the display layer 120 that is greater than the steering force Threshold to restore handwriting more accurately.

Referring to FIG. 1 , FIG. 3 and FIG. 4 together, in some embodiments, the first piezoelectric units 152 extend along the first direction 170 , and the plurality of first piezoelectric units 152 are sequentially spaced along the second direction 180 . The minimum distance between any two adjacent first piezoelectric units 152 is equal. The second piezoelectric units 154 extend along the second direction 180 , the plurality of second piezoelectric units 154 are arranged in sequence along the first direction 170 at intervals, and the minimum distance between any two adjacent second piezoelectric units 154 is equal. The first direction 170 and the second direction 180 are two orthogonal directions on a plane parallel to the display layer 120 . Therefore, the distribution density of the intersections formed by the first piezoelectric unit 152 and the second piezoelectric unit 154 are equal, and the arrangement is regular, and it is easier to obtain continuous and complete handwriting.

Further, in some embodiments, each first piezoelectric unit 152 is orthogonal to all of the second piezoelectric units 154 , and each second piezoelectric unit 154 is orthogonal to all of the first piezoelectric units 152 . For example, in some embodiments, the length of each first piezoelectric unit 152 is equal and equal to the length of each second piezoelectric unit 154 . In this way, the first piezoelectric unit 152 and the second piezoelectric unit 154 can form a larger number of intersections, the utilization rate is higher, the cost can be reduced, and at the same time, the restoration range of the handwriting can be enlarged.

It can be understood that when the tip of the writing pen 140 is located in the gap between the first piezoelectric unit 152 and the second piezoelectric unit 154, the pressure of the writing pen 140 cannot be transmitted to the piezoelectric material layer 150, resulting in the piezoelectric material layer. 150 cannot achieve restoration of handwriting. In order to avoid the situation that the piezoelectric material layer 150 cannot restore handwriting, since the size of the tip of a common writing pen 140 is 0.5 mm, in some embodiments, the minimum distance between two adjacent first piezoelectric units 152 is less than or equal to 0.5mm, the minimum distance between two adjacent second piezoelectric units 154 is less than or equal to 0.5mm. The minimum distance between two adjacent first piezoelectric units 152 and two adjacent second piezoelectric units 154 is less than or equal to 0.5 mm, which can avoid the situation that the tip of the writing pen 140 does not fall into the intersection, and can also increase the The distribution density of large intersection points makes the restored handwriting more continuous and complete.

It should be noted that the insulating cover plate 130 is made of insulating materials such as polyethylene terephthalate (PET), that is, it can cooperate with the light-absorbing back plate 110 to protect the display layer 120 and the piezoelectric material layer 150, and also When the piezoelectric material layer 150 is electrified, it can be prevented that an electric field is formed between the piezoelectric material layer 150 and the insulating cover plate 130 to affect the orientation of the liquid crystal material of the display layer 120 .

Please refer to Fig. 1-Fig. 3 again, the present application also provides a method for restoring handwriting, comprising the following steps:

The electronic tablet described in any of the above embodiments is provided.

Use the writing pen 140 to write the pen 140 on the electronic tablet. The writing pen 140 exerts pressure on the surface of the insulating cover plate 130 away from the display layer 120 , and the pressure is transmitted through the insulating cover plate 130 and exerts pressure on the surface of the display layer 120 away from the piezoelectric material layer 150 , so that the display layer 120 is located in the stressed position The direction of the liquid crystal at the place is deflected to produce handwriting. The display layer 120 transmits the pressure to the piezoelectric material layer 150 , and the intersection at the force-receiving position converts the pressure into an electrical signal and transmits it to the control element 160 .

An electric field is applied to the display layer 120 to erase handwriting.

The control element 160 applies a voltage to the piezoelectric material layer 150 to restore the handwriting. Wherein, the control element 160 applies a voltage to the first piezoelectric unit 152 and the second piezoelectric unit 154 passing through the force-bearing position according to the electrical signal, so that the intersection at the force-bearing position exerts a force greater than the turning threshold on the display layer 120 , and then restore the handwriting.

It can be understood that, according to different settings of the control element 160, the order in which the piezoelectric material layer 150 restores the handwriting is not limited, as long as the handwriting can be completely restored. For example, referring to FIGS. 3-6 together, FIG. 4 shows a schematic diagram of handwriting formed by the display layer 120 in some embodiments, and FIG. 5 shows a schematic diagram of a process of restoring the handwriting by the piezoelectric material layer 150 in some embodiments. , FIG. 6 shows a schematic diagram of the handwriting restored by the piezoelectric material layer 150 in some embodiments. In the embodiment shown in FIG. 4 , the writing pen 140 makes the display layer 120 form a handwriting of a rectangle A and a horizontal line B, and the force position is the rectangle A and the horizontal line B shown in FIG. 4 , and the piezoelectric material layer The four intersection points 150 located within rectangle A and the four intersection points located in horizontal line B convert the pressure into electrical signals and transmit them to the control element 160 .

During the process of restoring the handwriting, the control element 160 sequentially applies a voltage to the first piezoelectric units 152 passing through the force-bearing position along the second direction 180 according to the electrical signal, and when a voltage is applied to one of the first piezoelectric units 152, the control element 160 controls The element 160 simultaneously applies a voltage along the first direction 170 to the second piezoelectric unit 154 that intersects with the first piezoelectric unit 152 and passes through the force-bearing position. For example, as shown in FIG. 5 , the control element 160 first applies a voltage to the first piezoelectric unit C, and simultaneously applies a voltage to the second piezoelectric units D, E, and F intersecting with the first piezoelectric unit C in sequence. Referring to FIG. 6 , when the voltage is applied to the second piezoelectric unit 154 that intersects with the first piezoelectric unit C and passes through the force-bearing position, the voltage of the first pressure unit C is disconnected, and A piezoelectric unit G applies a voltage, and at the same time, a voltage is applied to the second piezoelectric units D, E, F intersecting with the first piezoelectric unit G in sequence. By analogy, when a voltage is applied to all the first piezoelectric unit 152 and the second piezoelectric unit 154 passing through the force-bearing position, the handwriting can be restored at the intersection at the force-bearing position

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. An electronic writing pad, comprising:

the display layer can generate handwriting at a stressed position under the action of pressure;

a piezoelectric material layer laminated with the display layer, the piezoelectric material layer being capable of converting the pressure into an electrical signal; and

and the control element is electrically connected with the piezoelectric material layer and can apply voltage to the piezoelectric material layer according to the electric signal so that the piezoelectric material layer applies acting force to the display layer at the stress position to restore the handwriting.

2. An ewriter board of claim 1, wherein the layer of piezoelectric material includes a first piezoelectric layer and a second piezoelectric layer arranged in a stack, the first piezoelectric layer including a plurality of first piezoelectric elements arranged at intervals, the second piezoelectric layer including a plurality of second piezoelectric elements arranged at intervals, the first piezoelectric elements intersecting the second piezoelectric elements.

3. The eWriter of claim 2, wherein said first piezoelectric elements extend in a first direction, a plurality of said first piezoelectric elements are sequentially spaced apart in a second direction, said second piezoelectric elements extend in said second direction, and a plurality of said second piezoelectric elements are sequentially spaced apart in said first direction, said first direction and said second direction being two orthogonal directions in a plane parallel to said display layer.

4. An eWriter as recited in claim 3, wherein each of said first piezoelectric elements is orthogonal to all of said second piezoelectric elements, and each of said second piezoelectric elements is orthogonal to all of said first piezoelectric elements.

5. An eWriter pad of claim 2, wherein a minimum spacing between adjacent ones of said first piezoelectric elements is less than or equal to 0.5mm, and a minimum spacing between adjacent ones of said second piezoelectric elements is less than or equal to 0.5 mm.

6. The eWriter of claim 2 wherein said control element comprises a first control unit electrically connected to all of said first piezoelectric units for applying a voltage to any of said first piezoelectric units, and a second control unit electrically connected to all of said second piezoelectric units for applying a voltage to any of said second piezoelectric units.

7. The eWriter board of any one of claims 1-6, further comprising a light-absorbing back plate, wherein the display layer is made of a liquid crystal material, and the piezoelectric material layer and the display layer are sequentially stacked on the light-absorbing back plate; and/or

The electronic handwriting board further comprises an insulating cover plate, the insulating cover plate covers one side, deviating from the piezoelectric material layer, of the display layer, and the insulating cover plate can transmit pressure acting on one side, deviating from the display layer, of the insulating cover plate to the display layer and the piezoelectric material layer.

8. A handwriting restoration method is characterized by comprising the following steps:

providing an electronic handwriting board, wherein the electronic handwriting board comprises a display layer, a piezoelectric material layer and a control element, the display layer and the piezoelectric material layer are arranged in a laminated mode, and the control element is electrically connected with the piezoelectric material layer;

writing handwriting, namely applying pressure to the surface of the display layer, which is far away from the piezoelectric material layer, so that the display layer generates handwriting at a stress position, and the piezoelectric material layer converts the pressure into an electric signal and transmits the electric signal to the control element;

erasing the handwriting; and

and the control element applies voltage to the piezoelectric material layer according to the electric signal so that the piezoelectric material layer applies acting force to the display layer at the stress position to restore the handwriting.

9. Handwriting reduction method according to claim 8, characterized in that said layer of piezoelectric material comprises a first piezoelectric layer and a second piezoelectric layer arranged one above the other, said first piezoelectric layer comprising a plurality of first piezoelectric elements arranged at intervals, said second piezoelectric layer comprising a plurality of second piezoelectric elements arranged at intervals, said first piezoelectric elements intersecting said second piezoelectric elements to form intersections;

in the writing handwriting, the pressure is transmitted to the intersection point at the stress position;

in the restored handwriting, the control element applies voltage to the first piezoelectric unit and the second piezoelectric unit corresponding to the intersection point at the stress position.

10. -a method of handwriting reduction according to claim 9, wherein said display layer comprises liquid crystal material, in which writing said pressure diverts part of said liquid crystal material to form said writing;

the display layer is provided with a steering threshold value, and when the acting force applied to the display layer is greater than the steering threshold value, the display layer forms the handwriting;

in the restored handwriting, the acting force applied to the display layer by one first piezoelectric unit or one second piezoelectric unit is smaller than the steering threshold, and the acting force applied to the display layer by the first piezoelectric unit and the second piezoelectric unit corresponding to one intersection point is larger than the steering threshold.

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