CN107066161B

CN107066161B - Capacitive screen, liquid crystal handwriting device, touch display assembly and intelligent terminal

Info

Publication number: CN107066161B
Application number: CN201710385063.7A
Authority: CN
Inventors: 李风华
Original assignee: Shenzhen Wicue Optoelectronics Co Ltd
Current assignee: Shenzhen Wicue Optoelectronics Co Ltd
Priority date: 2016-07-14
Filing date: 2017-05-26
Publication date: 2020-10-27
Anticipated expiration: 2037-05-26
Also published as: CN106155447A; CN107066161A

Abstract

The invention discloses a capacitive screen, which comprises a first substrate layer, a first conducting layer, a mixing layer, a second conducting layer and a second substrate layer which are sequentially arranged from top to bottom, wherein the mixing layer comprises a mixture of a cholesteric liquid crystal and a high molecular structure and a light rotating agent for controlling the pitch of the cholesteric liquid crystal; the first conducting layer comprises a plurality of first transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent first transparent electrodes; the second conducting layer comprises a plurality of second transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent second transparent electrodes. According to the technical scheme, the pressing position and the pressing force of the capacitive screen can be determined. In addition, the invention also discloses a liquid crystal handwriting device, a touch display assembly and an intelligent terminal.

Description

Capacitive screen, liquid crystal handwriting device, touch display assembly and intelligent terminal

Technical Field

The invention relates to the technical field of liquid crystal, in particular to a capacitive screen, a liquid crystal handwriting device, a touch display assembly and an intelligent terminal.

Background

When an existing capacitive screen is pressed, a user finger and a working face form a coupling capacitor, because the working face is connected with a high-frequency signal, a small current is absorbed by the finger, the current flows out of electrodes on four corners of the screen respectively, theoretically, the current flowing through the four electrodes is proportional to the distance from the finger head to the four corners, and a controller obtains the position through precise calculation of the proportion of the four currents.

Therefore, the existing capacitive screen can only determine the pressing position but cannot determine the pressing force, and more control instructions cannot be obtained according to the pressing force.

Disclosure of Invention

The invention mainly aims to provide a capacitive screen, and aims to solve the problems that the size of pressing force cannot be determined and more control instructions cannot be obtained according to the size of the pressing force in the conventional capacitive screen.

In order to solve the above technical problems, the present invention provides a capacitive screen, which comprises a first substrate layer, a first conductive layer, a mixed layer, a second conductive layer and a second substrate layer sequentially arranged from top to bottom, wherein the mixed layer comprises a mixture of a cholesteric liquid crystal and a polymer structure, and a spin agent for controlling a pitch of the cholesteric liquid crystal; the first conducting layer comprises a plurality of first transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent first transparent electrodes; the second conducting layer comprises a plurality of second transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent second transparent electrodes.

Preferably, the cholesteric liquid crystal has a first zero-field stable state scattering visible light, a second zero-field stable state transmitting visible light, and a transparent applied-field stable state; when the cholesteric liquid crystal is in a first zero-field stable state, visible light incident to the cholesteric liquid crystal is in a white scattering state; when the cholesteric liquid crystal is pressed to be in a second zero-field stable state, visible light incident to the cholesteric liquid crystal is in a transmission state, and when the cholesteric liquid crystal is in an electric field added stable state, light incident to the cholesteric liquid crystal is in a transmission state.

Preferably, the first transparent electrode and the second transparent electrode are perpendicular to each other.

Preferably, the capacitive screen further comprises a control circuit electrically connected with the first transparent electrode and the second transparent electrode respectively to form an LC oscillator circuit, and the control circuit determines the change position and the change size of the capacitance between the first transparent electrode and the second transparent electrode according to the resonance frequency of the LC oscillator circuit.

Preferably, the first and second substrate layers are PET films.

The invention also provides a liquid crystal handwriting device, which comprises a controller, a memory, a substrate and a capacitive screen arranged on the substrate; the capacitive screen comprises a first substrate layer, a first conducting layer, a mixing layer, a second conducting layer and a second substrate layer which are sequentially arranged from top to bottom, wherein the mixing layer comprises a mixture of cholesteric liquid crystal and a high molecular structure and a light rotating agent for controlling the pitch of the cholesteric liquid crystal; the first conducting layer comprises a plurality of first transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent first transparent electrodes; the second conducting layer comprises a plurality of second transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent second transparent electrodes; the controller is electrically connected with the capacitive screen and the memory, and is used for determining a touch position and an input operation instruction when a current user clicks the capacitive screen according to the change position and the change size of the capacitance between the first transparent electrode and the second transparent electrode; the controller is further used for generating handwriting information according to the touch position and storing the handwriting information in the memory.

Preferably, when the operation command is an erase command, the controller is further configured to apply a preset voltage to the first transparent electrode and the second transparent electrode.

The invention further provides a touch display assembly, which comprises a display screen, a controller and a capacitive screen; the capacitive screen comprises a first substrate layer, a first conducting layer, a mixing layer, a second conducting layer and a second substrate layer which are sequentially arranged from top to bottom, wherein the mixing layer comprises a mixture of cholesteric liquid crystal and a high molecular structure and a light rotating agent for controlling the pitch of the cholesteric liquid crystal; the first conducting layer comprises a plurality of first transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent first transparent electrodes; the second conducting layer comprises a plurality of second transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent second transparent electrodes; the capacitive screen is arranged on the front surface of the display screen; the controller is electrically connected with the display screen and the capacitive screen, and is used for determining a touch position and an input operation instruction when a user clicks the capacitive screen at present according to the change position and the change size of capacitance between the first transparent electrode and the second transparent electrode, and controlling the display screen to display according to the touch position and the operation instruction.

The invention further provides an intelligent terminal which comprises a touch display assembly, wherein the touch display assembly comprises a display screen, a controller and a capacitive screen; the capacitive screen comprises a first substrate layer, a first conducting layer, a mixing layer, a second conducting layer and a second substrate layer which are sequentially arranged from top to bottom, wherein the mixing layer comprises a mixture of cholesteric liquid crystal and a high molecular structure and a light rotating agent for controlling the pitch of the cholesteric liquid crystal; the first conducting layer comprises a plurality of first transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent first transparent electrodes; the second conducting layer comprises a plurality of second transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent second transparent electrodes; the capacitive screen is arranged on the front surface of the display screen; the controller is electrically connected with the display screen and the capacitive screen, and is used for determining a touch position and an input operation instruction when a user clicks the capacitive screen at present according to the change position and the change size of capacitance between the first transparent electrode and the second transparent electrode, and controlling the display screen to display according to the touch position and the operation instruction.

Preferably, the intelligent terminal is a mobile phone, a tablet computer, an automatic teller machine, an automatic ticket vending machine or a self-service machine.

The technical scheme of the invention is that the capacitor is provided with the first conducting layer, the mixed layer and the second conducting layer, and when the first conducting layer and the second conducting layer are conducted through an external circuit, the first conducting layer, the mixed layer and the second conducting layer jointly form the capacitor. The first conducting layer comprises a plurality of first transparent electrodes arranged in parallel, the second conducting layer comprises a plurality of second transparent electrodes arranged in parallel, and therefore each unit position on the capacitive screen corresponds to a specific first transparent electrode and a specific second transparent electrode. When the capacitive screen is pressed, the cholesteric liquid crystal in the mixed layer at the pressed position is pressed to rotate, and the dielectric constant of the cholesteric liquid crystal is changed after the cholesteric liquid crystal rotates, so that the capacitance between the corresponding first transparent electrode and the corresponding second transparent electrode is obviously changed. The pressing position can be determined by determining which first transparent electrode and which second transparent electrode have the capacitance change; meanwhile, as the larger the pressing force is, the more cholesteric liquid crystal is rotated, and the capacitance change amount between the corresponding first transparent electrode and the corresponding second transparent electrode is larger, the magnitude of the pressing force can be determined from the capacitance change amount between the corresponding first transparent electrode and the corresponding second transparent electrode. The capacitive screen can accurately determine the pressing position and the pressing force, so that more touch information can be obtained, a touch product using the capacitive screen can obtain various control instructions according to the pressing position and the pressing force, and a better touch effect is achieved.

Drawings

FIG. 1 is a schematic structural diagram of a capacitive screen according to an embodiment of the present invention;

FIG. 2 is a schematic view of the capacitive screen of FIG. 1 in a partially compressed state;

FIG. 3 is a schematic structural diagram of an embodiment of a liquid crystal handwriting device according to the invention;

FIG. 4 is a functional block diagram of the liquid crystal handwriting device of FIG. 3;

FIG. 5 is a schematic structural diagram of a touch display device according to an embodiment of the present invention;

FIG. 6 is a functional block diagram of the touch display device of FIG. 5;

FIG. 7 is a display screen diagram of the intelligent terminal according to the present invention before the display screen is touched;

FIG. 8 is a display view of the display screen after the mail icon in FIG. 7 is tapped;

fig. 9 is a display screen view of the display screen after the mail icon in fig. 7 is pressed again.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Capacitive screen	110	A first substrate layer
120	First conductive layer	140	Second conductive layer
				150	A second substrate layer	121	A first transparent electrode
131	Cholesteric liquid crystal	141	A second transparent electrode
				200 or 200'	Controller		300	Memory device
400	Substrate	500	Display screen

Detailed Description

In order to more clearly illustrate the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, the capacitive screen 100 of the present invention includes a first substrate layer 110, a first conductive layer 120, a mixed layer, a second conductive layer 140 and a second substrate layer 150, which are sequentially disposed from top to bottom, wherein the mixed layer includes a mixture of a cholesteric liquid crystal 131 and a polymer structure, and an optical rotatory agent for controlling a pitch of the cholesteric liquid crystal 131; the first conductive layer 120 includes a plurality of first transparent electrodes 121 arranged in parallel, and a gap is formed between two adjacent first transparent electrodes; the second conductive layer 140 includes a plurality of second transparent electrodes 141 arranged in parallel, and a gap is formed between two adjacent second transparent electrodes.

The invention adopts the technical scheme that the first conductive layer 120, the mixed layer and the second conductive layer 140 are arranged. When the first conductive layer 120 and the second conductive layer 140 are connected through an external circuit, the first conductive layer 120, the mixed layer, and the second conductive layer 140 form a capacitor. The first conductive layer 120 includes a plurality of first transparent electrodes 121 (indicated by solid lines with arrows to distinguish from the first conductive layer 120) disposed in parallel, the second conductive layer 140 includes a plurality of second transparent electrodes 141 (indicated by solid lines with arrows to distinguish from the second conductive layer 140) disposed in parallel, and the first transparent electrodes 121 and the second transparent electrodes 141 are both disposed in a stripe shape. Thus, each unit position on the capacitive screen 100 corresponds to a specific first transparent electrode 121 and a specific second transparent electrode 141, and when the capacitive screen 100 is pressed, the cholesteric liquid crystal 131 in the mixed layer at the pressed position is pressed to rotate, and the dielectric constant of the cholesteric liquid crystal 131 changes after the rotation, so that the capacitance between the corresponding first transparent electrode 121 and the corresponding second transparent electrode 141 is obviously changed. The pressed position can be determined by determining which first transparent electrode 121 and which second transparent electrode 141 have a change in capacitance therebetween. Meanwhile, since the larger the pressing force is, the more cholesteric liquid crystal 131 rotates, and the capacitance change amount between the corresponding first and second

transparent electrodes

121 and 141 is larger, the magnitude of the pressing force can be determined from the capacitance change amount between the corresponding first and second

transparent electrodes

121 and 141. Therefore, the capacitive screen 100 of the present invention can accurately determine the pressing position and the pressing force, so as to obtain more touch information, which is beneficial for a touch product using the capacitive screen 100 to obtain various control instructions according to the pressing position and the pressing force, thereby achieving a better touch effect.

The cholesteric liquid crystal 131 has two zero-field stable states and one applied-field stable state. Specifically, as will be further understood with reference to fig. 2, the cholesteric liquid crystal 131 has a first zero-field stable state (FC state), a second zero-field stable state (P state), and an applied-field stable state (H state). In order to avoid color marks when pressed, the optical rotation agent in the mixed layer can be used to adjust the rotation pitch of the cholesteric liquid crystal 131, so as to control the wavelength of light reflected by the cholesteric liquid crystal 131, and thus the wavelength of light reflected by the cholesteric liquid crystal 131Bragg is controlled to be greater than the maximum value of the wavelength of red light by adding an appropriate amount of the optical rotation agent, so that the cholesteric liquid crystal 131 can transmit visible light in the second zero-field steady state. Thus, in the capacitive panel 100 of the present embodiment, when the cholesteric liquid crystal 131 is in the first zero-field stable state, the visible light incident on the cholesteric liquid crystal 131 is in a white scattering state; when the cholesteric liquid crystal 131 is pressed to be in the second zero-field stable state, the visible light incident on the cholesteric liquid crystal 131 is in a transmission state, and when the cholesteric liquid crystal 131 is in the applied-field stable state, the light incident on the cholesteric liquid crystal 131 is in a transmission state. In the embodiment of the present invention, when observed with naked eyes, the capacitive screen 100 is in a transparent state when an electric field is applied, and a pressed position of the capacitive screen 100 is also in a transparent state when pressed, so that no difference is generated visually.

Referring to fig. 1, in the present embodiment, the first transparent electrode 121 and the second transparent electrode 141 are preferably perpendicular to each other. The first substrate layer 110 and the second substrate layer 150 may be configured as needed, and in this embodiment, the first substrate layer 110 and the second substrate layer 150 are preferably PET films, or may be glass layers.

Further, in a preferred embodiment, the capacitive screen 100 further includes a control circuit electrically connected to the first transparent electrode 121 and the second transparent electrode 141 respectively to form an LC oscillator, and the control circuit determines a variation position and a variation size of the capacitance between the first transparent electrode 121 and the second transparent electrode 141 according to a resonant frequency of the LC oscillator. Before writing on the capacitive screen 100 by a writing pen or a human hand, one of the first transparent electrode 121 and the second transparent electrode 141 serves as a driving electrode (transmitting electrode) and the other serves as a receiving electrode; thereby allowing a stable electric field to be formed between the first and second

transparent electrodes

121 and 141. When writing is performed on the capacitive screen 100 by a writing pen or a human hand, an electric field formed between the first transparent electrode 121 and the second transparent electrode 141 is changed due to the clicked position, so that the coordinate value of the current clicked position is determined. Since the electric field between the first transparent electrode 121 and the second transparent electrode 141 is changed, the electric quantity of the capacitor formed by the first transparent electrode 121 and the second transparent electrode 141 is changed, and the resonant frequency of the LC oscillating circuit is changed. By detecting the change of the resonant frequency of the LC oscillating circuit, the change position and the change of the capacitance between the first transparent electrode 121 and the second transparent electrode 141 can be quickly and intuitively determined, and then the touch position and the input operation instruction when the current user clicks the capacitive screen 100 can be determined.

Referring to fig. 3 and 4, and as will be understood with reference to fig. 1 and 2, when the capacitive screen 100 is applied to a liquid crystal handwriting device, a liquid crystal handwriting device capable of storing writing information and erasing by touch can be obtained. Specifically, the liquid crystal handwriting device comprises a controller 200, a memory 300, a substrate 400 and a capacitive screen 100 arranged on the substrate 400. The specific structure of the capacitive screen 100 refers to the above embodiments, and since the touch display device adopts all the technical solutions of all the above embodiments, at least all the technical effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here. The controller 200 is electrically connected to the capacitive screen 100 and the memory 300, and the controller 200 is configured to determine a touch position and an input operation instruction when a current user clicks the capacitive screen 100 according to a change position and a change size of capacitance between the first transparent electrode 121 and the second transparent electrode 141; the controller 200 is further configured to generate handwriting information according to the touch position and store the handwriting information in the memory 300.

As will be further understood with reference to fig. 3 in conjunction with fig. 1 and 2, before writing, the cholesteric liquid crystal 131 is maintained in the first zero-field stable state, and the capacitive screen 100 appears white due to visible light scattering, and when a user writes on the first substrate layer 110 (applies pressure to the first substrate layer 110), the cholesteric liquid crystal 131 corresponding to a user writing a note will have the lowest energy, thereby triggering the cholesteric liquid crystal 131 to assume the second zero-field stable state. At this time, the visible light transmits the cholesteric liquid crystal 131 in the second zero-field stable state and is incident on the substrate 400 through the second conductive layer 140 and the second matrix layer 150, so that the user writes a note in the color of the substrate 400.

It should be noted that the color of the substrate 400 can be set according to actual needs, and preferably, the substrate 400 is set in black in this embodiment, so as to implement a writing manner of black characters on white. Specifically, the substrate 400 is attached to the second base layer 150, and a surface of the substrate 400 facing the second base layer 150 is black.

When the capacitive screen 100 is applied to the liquid crystal handwriting device, the capacitive screen 100 can accurately determine the pressing position and the pressing force, so that more touch information can be obtained, the controller 200 can generate handwriting information according to the touch position and store the handwriting information, the handwriting information between two times of wiping operation forms a handwriting file, corresponding handwriting information can be called when the handwriting file is required to be checked, the handwriting recording function of the liquid crystal handwriting device is realized, each writing can be stored, the follow-up calling of a user is facilitated, the functions of the liquid crystal handwriting device are further enriched, and the use of the user is facilitated.

In the embodiment of the invention, the liquid crystal handwriting device can be a liquid crystal blackboard applied to classroom teaching or a portable liquid crystal handwriting board applied to multiple fields of painting, design and the like.

In the embodiment of the invention, the input operation instruction can be determined by determining the pressing position and/or the pressing force magnitude. Taking the erase command as an example, the operation command when the specific position is touched may be the erase command, or the operation command when the pressing force exceeds the threshold may be the erase command, or the operation command when the specific position is touched and the pressing force exceeds the threshold may be the erase command, or the operation command when the area of the touched position exceeds a certain value may be the erase command. When the operation command is an erase command, the controller 200 is further configured to apply a preset voltage to the first transparent electrode 121 and the second transparent electrode 141. For example, when the operation command when the area of the touch position exceeds a certain value is an erasing command, a writing pen including a pen point for writing by a user and a pen tail for erasing may be set; when the pen point is used for clicking the capacitive screen 100, the capacitance change condition is a first condition; when the pen tail is used to click the capacitive screen 100, the capacitance change condition is the second condition. The first condition and the second condition can be tested by the controller 200 and can be stored in the memory 300, and when the capacitance change condition is the first condition, the writing instruction is determined; when the capacitance change condition is a second condition, then an erase command is determined. When the operation command is an erase command, the controller 200 is further configured to apply a preset voltage to the first transparent electrode 121 and the second transparent electrode 141 to make the cholesteric liquid crystal 131 assume the first zero-field stable state, so as to erase the handwriting on the liquid crystal handwriting device.

Referring to fig. 5 and 6, and as will be understood with reference to fig. 1 and 2, when the capacitive screen 100 is applied to a touch display device, a touch display device capable of inputting different operation instructions by pressing force can be obtained, and specifically, the touch display device includes a display screen 500, a controller 200' and a capacitive screen 100; the specific structure of the capacitive screen 100 refers to the above embodiments, and since the touch display device adopts all the technical solutions of all the above embodiments, at least all the technical effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here. Wherein, the capacitive screen 100 is disposed on the front surface of the display screen 500; the controller 200' is electrically connected to the display screen 500 and the capacitive screen 100, and the controller 200 is configured to determine a touch position and an input operation instruction when a user clicks the capacitive screen 100 according to a change position and a change size of capacitance between the first transparent electrode 121 and the second transparent electrode 141, and control the display screen 500 to display according to the touch position and the operation instruction.

Referring to fig. 5 in combination with fig. 1 and fig. 2, when the touch display device of the present invention is used, the voltage signal is continuously applied to the capacitive screen 100 to keep the capacitive screen 100 in the H state, and at this time, the capacitive screen 100 is transparent, so that a user can see the display content of the display screen 500 through the capacitive screen 100. When a user touches the touch display component, the cholesteric liquid crystal 131 in the mixed layer of the capacitive screen 100 is switched to a second zero-field stable state, the wavelength of a cholesteric liquid crystal 131Bragg reflection light wave is controlled to be larger than the maximum value of a red light wavelength by adjusting the dosage of the optical rotation agent, so that the cholesteric liquid crystal 131 can transmit visible light in the second zero-field stable state, and when the capacitive screen 100 is pressed, the pressing position of the capacitive screen 100 is still transparent when the capacitive screen 100 is observed by naked eyes, and the sight of the user cannot be blocked; when a user needs to touch, the capacitive screen 100 is pressed, so that the cholesteric liquid crystal 131 corresponding to a note written by the user has the lowest energy, the cholesteric liquid crystal 131 is triggered to have a second zero-field stable state, the capacitance between the first transparent electrode 121 and the second transparent electrode 141 at the corresponding position is obviously changed, the controller 200 'determines a touch object according to the touch position, and determines an operation instruction according to the capacitance change size, so that touch is realized, and meanwhile, the controller 200' also controls the display screen 500 to display a corresponding picture according to a touch result, so that the touch function and the display function of the touch display assembly are realized.

Therefore, the capacitive screen 100 can accurately determine the pressing position and the pressing force, so that more touch information can be obtained, the controller 200' can determine the operation object according to the pressing position and determine the operation instruction according to the pressing force, thus not only realizing the touch function and the display function of the touch display assembly, but also obtaining more touch information, and being beneficial to obtaining various control instructions according to the pressing position and the pressing force by using a touch product using the capacitive screen 100, thereby achieving better touch effect.

Two examples of the touch display device are described in more detail herein to illustrate the touch display effect of the touch display device. In an example one, when a certain display content needs to be operated, the position of the display content is touched, the controller 200 'determines that the display content is a processing object of an operation instruction, the controller 200' lightly presses the processing object to determine that a corresponding operation instruction is a selected processing object, and the controller 200 'heavily presses the processing object to determine that the corresponding operation instruction is a deletion processing object, so that the controller 200' can determine the processing object by pressing the corresponding position and determine the operation instruction by the pressing force degree during pressing, and thus, a quicker deletion operation is performed. In the second embodiment, when handwriting is input on the touch display device, the controller 200' controls the corresponding position of the display screen 500 to display handwriting according to the position of the capacitance change on the capacitive screen 100, and controls the thickness of the handwriting displayed on the display screen 500 according to the size of the capacitance change at each position; specifically, when the user slides across the capacitive screen 100, the capacitance of the position of the scanned track changes, the controller 200 'controls the display screen 500 to display a piece of handwriting at the corresponding position according to the position where the capacitance changes, and meanwhile, the controller 200 can also obtain the magnitude of the capacitance change, and the larger the change is, the thicker the handwriting of the position corresponding to the display screen 500 is controlled by the controller 200', so that the writing thickness is realized, and the more realistic writing effect is obtained.

The invention further provides an intelligent terminal which comprises a touch display component. The specific structure of the touch display module refers to the above embodiments, and since the intelligent terminal adopts all the technical solutions of all the above embodiments, the specific structure at least has all the technical effects brought by the technical solutions of the above embodiments, and details are not repeated here.

Specifically, the intelligent terminal may be a device requiring touch display, such as a mobile phone, a tablet computer, an automatic teller machine, an automatic ticket vending machine, or a self-service machine.

Referring to fig. 7 to 9, the application scenario is described by taking an example in which an operation object is a mail application icon when the intelligent terminal is a mobile phone or a tablet computer. Before the touch, the display screen displays an icon of the mail application program, and the display screen is as shown in fig. 7. When the capacitive screen at the position of the mail icon is lightly pressed, the controller judges that the instruction enters the mail application program, and controls the display screen to display the mail application program interface, wherein the display screen is as shown in fig. 8. When the capacitive screen at the position of the mail icon is pressed again, the controller judges that the instruction of opening the secondary menu of the mail application program is given, controls the display screen to display the secondary menu of the mail application program, and the display screen is as shown in fig. 9. According to the application scene, the intelligent terminal can obtain different control instructions according to the pressing force, so that the touch operation of a user is more convenient.

The above description is only a part of or preferred embodiments of the present invention, and neither the text nor the drawings should be construed as limiting the scope of the present invention, and all equivalent structural changes, which are made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.

Claims

1. The liquid crystal handwriting device is characterized by comprising a controller, a memory, a substrate and a capacitive screen arranged on the substrate; the capacitive screen comprises a first substrate layer, a first conducting layer, a mixing layer, a second conducting layer and a second substrate layer which are sequentially arranged from top to bottom, wherein the mixing layer comprises a mixture of cholesteric liquid crystal and a high molecular structure and a light rotating agent for controlling the pitch of the cholesteric liquid crystal; the first conducting layer comprises a plurality of first transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent first transparent electrodes; the second conducting layer comprises a plurality of second transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent second transparent electrodes; the first transparent electrode and the second transparent electrode are arranged in a strip shape, each unit position on the capacitive screen corresponds to one specific first transparent electrode and one specific second transparent electrode, when the capacitive screen is pressed, cholesteric liquid crystals in a mixed layer corresponding to the pressing position are pressed to rotate, the dielectric constant of the cholesteric liquid crystals is changed after the cholesteric liquid crystals rotate, and the capacitance between the corresponding first transparent electrode and the corresponding second transparent electrode is changed; the capacitive screen further comprises a control circuit which is respectively and electrically connected with the first transparent electrode and the second transparent electrode to form an LC oscillating circuit, and the control circuit determines the change position and the change size of the capacitance between the first transparent electrode and the second transparent electrode according to the resonance frequency of the LC oscillating circuit; the controller is electrically connected with the capacitive screen and the memory, and is used for determining a touch position and an input operation instruction when a current user clicks the capacitive screen according to the change position and the change size of the capacitance between the first transparent electrode and the second transparent electrode; the controller is further used for generating handwriting information according to the touch position and storing the handwriting information in the memory.

2. The liquid crystal handwriting device according to claim 1, wherein when said operation command is an erase command, said controller is further configured to apply a preset voltage across said first transparent electrode and said second transparent electrode.

3. The liquid crystal handwriting apparatus of claim 1, wherein said cholesteric liquid crystal has a first zero-field steady state scattering visible light, a second zero-field steady state transmitting visible light, and a transparent applied-field steady state; when the cholesteric liquid crystal is in a first zero-field stable state, visible light incident to the cholesteric liquid crystal is in a white scattering state; when the cholesteric liquid crystal is pressed to be in a second zero-field stable state, visible light incident to the cholesteric liquid crystal is in a transmission state, and when the cholesteric liquid crystal is in an electric field added stable state, light incident to the cholesteric liquid crystal is in a transmission state.

4. The liquid crystal handwriting apparatus of claim 1, wherein said first transparent electrode and second transparent electrode are perpendicular to each other.

5. The liquid crystal handwriting apparatus of claim 1, wherein said first and second substrate layers are PET films.

6. A touch display component is characterized by comprising a display screen, a controller and a capacitive screen;

the capacitive screen is arranged on the front surface of the display screen and comprises a first substrate layer, a first conducting layer, a mixing layer, a second conducting layer and a second substrate layer which are sequentially arranged from top to bottom, wherein the mixing layer comprises a mixture of a cholesteric liquid crystal and a high molecular structure and a light rotating agent for controlling the pitch of the cholesteric liquid crystal; the first conducting layer comprises a plurality of first transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent first transparent electrodes; the second conducting layer comprises a plurality of second transparent electrodes which are arranged in parallel, and a gap is formed between every two adjacent second transparent electrodes; the first transparent electrode and the second transparent electrode are arranged in a strip shape, each unit position on the capacitive screen corresponds to one specific first transparent electrode and one specific second transparent electrode, when the capacitive screen is pressed, cholesteric liquid crystals in a mixed layer corresponding to the pressing position are pressed to rotate, the dielectric constant of the cholesteric liquid crystals is changed after the cholesteric liquid crystals rotate, and the capacitance between the corresponding first transparent electrode and the corresponding second transparent electrode is changed; the capacitive screen further comprises a control circuit which is respectively and electrically connected with the first transparent electrode and the second transparent electrode to form an LC oscillating circuit, and the control circuit determines the change position and the change size of the capacitance between the first transparent electrode and the second transparent electrode according to the resonance frequency of the LC oscillating circuit;

the controller is electrically connected with the display screen and the capacitive screen, and is used for determining a touch position and an input operation instruction when a user clicks the capacitive screen at present according to the change position and the change size of capacitance between the first transparent electrode and the second transparent electrode, and controlling the display screen to display according to the touch position and the operation instruction.

7. The touch display device of claim 6, wherein the cholesteric liquid crystal has a first zero-field stable state scattering visible light, a second zero-field stable state transmitting visible light, and a transparent applied-field stable state; when the cholesteric liquid crystal is in a first zero-field stable state, visible light incident to the cholesteric liquid crystal is in a white scattering state; when the cholesteric liquid crystal is pressed to be in a second zero-field stable state, visible light incident to the cholesteric liquid crystal is in a transmission state, and when the cholesteric liquid crystal is in an electric field added stable state, light incident to the cholesteric liquid crystal is in a transmission state.

8. The touch display device of claim 6, wherein the first transparent electrode and the second transparent electrode are perpendicular to each other.

9. An intelligent terminal, characterized by comprising the touch display assembly according to any one of claims 6 to 8.

10. The intelligent terminal of claim 9, wherein the intelligent terminal is a cell phone, a tablet computer, an automated teller machine, an automated ticket vending machine, or a self-service machine.