WO2019119423A1

WO2019119423A1 - Handwriting apparatus and touch control display panel thereof

Info

Publication number: WO2019119423A1
Application number: PCT/CN2017/118020
Authority: WO
Inventors: 李贺
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2017-12-22
Filing date: 2017-12-22
Publication date: 2019-06-27
Also published as: CN111316208A

Abstract

A handwriting apparatus and a touch control display panel (10) thereof. The touch control display panel (10) comprises an upper electrode board (11), a lower electrode board (12), and a bistable liquid crystal layer (13) arranged between the upper electrode board (11) and the lower electrode board (12). The upper electrode board (11) comprises a first substrate and multiple first electrodes arranged on a lower surface of the first substrate; the lower electrode board (12) comprises a second substrate and multiple second electrodes arranged on an upper surface of the second substrate; two adjacent first electrodes are close to each other and do not overlap with each other; and two adjacent second electrodes are close to each other and do not overlap with each other.

Description

Handwriting device and touch display panel thereof

Technical field

The present invention relates to the field of liquid crystal display, and in particular to a handwriting device and a touch display panel thereof.

Background technique

At present, cholesteric liquid crystal is often used in tablet products, which is a kind of bistable liquid crystal. The optical state of this type of bistable liquid crystal can be converted by field force such as electric field and magnetic field, and can also be mechanically deformed. Changed. The main working principle of the handwriting display function is that the tablet includes a touch module and a display module. When the pen tip or other hard object is used for touch writing, the touch module is used to detect the position coordinates of the user's touch pressure, and the display is displayed. Since the module is composed of a bistable liquid crystal loaded by the liquid crystal cell, the user's touch pressure can change the arrangement of the liquid crystal molecules at the contact pressure position (taking cholesteric liquid crystal as an example, the mechanical pressure causes the cholesteric liquid crystal to be composed of the cholesteric focal conic structure). The result of the transition to a cholesteric planar structure) is to "write" the writing on the substrate. Therefore, the bistable liquid crystal display module allows the user to apply a conventional mechanical pressure to achieve real-life rendering on the display screen.

However, such a tablet generally attaches the touch module to the display module, and thus has the following drawbacks:

1. The touch module is located on the display module. Due to the barrier of the touch module material, the conventional mechanical pressure cannot be effectively deformed on the display module, that is, the handwriting display function cannot be realized by a simple touch pressure method;

2. The touch module and the display module are two-layer structure, the stacking thickness is large, the number of stacked layers is large, and the material cost is high;

3. When the touch module is working, the voltage fluctuation of the display module may cause an interference burst on the touch screen.

technical problem

The technical problem to be solved by the present invention is that the prior art cannot realize the handwriting display function by a simple touch pressure method, the material cost is high, and the interference explosion point is likely to occur.

Technical solution

The technical solution adopted by the present invention to solve the technical problem is: constructing a touch display panel, comprising an upper electrode plate, a lower electrode plate, and a bistable state disposed between the upper electrode plate and the lower electrode plate a liquid crystal layer, the upper electrode plate including a first substrate and a plurality of first electrodes disposed on a lower surface of the first substrate, the lower electrode plate including a second substrate and an upper surface disposed on the second substrate The plurality of second electrodes are adjacent to each other and do not overlap each other, and the adjacent two second electrodes are close to each other and do not overlap each other.

Preferably, the first electrode and the second electrode are strip electrodes, and the plurality of first electrodes are arranged in parallel along the first direction, and the plurality of second electrodes are arranged in parallel along the second direction, the first One direction and the second direction are non-parallel directions.

Preferably, the second electrode comprises a first module and a second module, the second module is at least partially disposed on an upper surface and/or a lower surface of the first module, and the first module is in touch a dummy electrode in mode; or,

The first electrode includes a third module and a fourth module, the fourth module is at least partially disposed on an upper surface and/or a lower surface of the third module, and the third module is in a touch mode False electrode.

Preferably, the second module is further disposed at least partially on a left side and/or a right side of the first module; or

The fourth module is also at least partially disposed on a left side and/or a right side of the third module.

Preferably, the first direction is perpendicular to the second direction.

The first substrate and the second substrate are both a PET film, a glass layer, COP or PI, and the first electrode and the second electrode are both transparent electrodes.

The invention also constructs a handwriting device, which comprises:

Substrate

a touch display panel disposed on the substrate, the touch display panel being the touch display panel according to any one of claims 1 to 5;

And a controller, configured to control the first electrode and the second electrode to be in a touch mode during steady state display, and detect coordinate information of the user's touch pressure to form handwriting information.

Preferably, the controller is further configured to control the first electrode and the second electrode to be in a display driving mode to perform clearing when determining that writing is completed.

Preferably, the method further comprises:

a memory for storing the handwriting information.

Preferably, the controller is configured to output a touch driving signal to the first electrode or the second electrode in the touch mode, and output a display driving signal to the first electrode or the second electrode in the display driving mode, and The touch drive signal is smaller than the display drive signal.

Preferably, the controller is configured to determine, in the single-word writing mode, that if the new coordinate information is not detected within the preset time period, the writing is completed; in the continuous writing mode, if it is determined that the specific handwriting is obtained, Make sure the writing is complete.

Preferably, the substrate is a white substrate.

The invention also constructs a touch display method, comprising:

In the steady state display, the first electrode and the second electrode of the touch display panel are controlled to be in a touch mode, wherein the touch display panel is disposed on the substrate, and the touch display panel is claim 1-6 The touch display panel of any one of the above;

The coordinate information of the user's touch pressure is detected to form handwriting information.

Preferably, the method further comprises:

When it is judged that the writing is completed, the first electrode and the second electrode are controlled to be in a display driving mode to perform clearing.

Preferably, the method further comprises:

The handwriting information is stored.

Preferably, the step of controlling the first electrode and the second electrode of the touch display panel to be in the touch mode is:

Controlling the first electrode and the second electrode of the touch display panel in a touch mode, and outputting a touch driving signal to the first electrode or the second electrode in the touch mode;

The step of controlling the first electrode and the second electrode to be in a display driving mode includes:

Controlling the first electrode and the second electrode to be in a display driving mode, and outputting a display driving signal to the first electrode or the second electrode in the display driving mode, the touch driving signal being smaller than the display driving signal.

Preferably, the step of determining that the writing is completed comprises:

In the single-word writing mode, if it is determined that no new coordinate information is detected within the preset time period, it is determined that the writing is completed;

In the continuous writing mode, if it is judged that a specific handwriting is obtained, it is determined that the writing is completed.

Beneficial effect

The technical solution of the present invention is that the touch module and the display module are integrated, that is, the touch module and the display module share the upper and lower electrode plates. Therefore, on the one hand, the stack of the touch display panels is thinned. And the thickness, so, the material cost can be saved, and the handwriting display function can be realized by the touch force with less force; on the other hand, since the electrodes on the upper and lower electrode plates are in the touch mode during the writing process, the bistable The liquid crystal layer is in a state of steady state display without power-on, so that the interference of the touch screen caused by the voltage fluctuation of the display module during the operation of the touch module in the prior art can be avoided.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS In the following, the embodiments of the present invention will be briefly described, and the drawings in the following description are merely exemplary embodiments of the present invention. For the skilled person, other drawings can be obtained from these drawings without any creative work. In the figure:

1 is a structural view of an embodiment of a touch display panel of the present invention;

Figure 2 is a structural view of an embodiment of the upper electrode plate of Figure 1;

Figure 3 is a structural view of an embodiment of the lower electrode plate of Figure 1;

Figure 4 is a structural view showing an embodiment of the handwriting device of the present invention;

FIG. 5 is a flow chart of an embodiment of a touch display method according to the present invention.

Embodiments of the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a structural diagram of an embodiment of a touch display panel according to the present invention. The touch display panel 10 of the embodiment includes an upper electrode plate 11, a bistable liquid crystal layer 13, and a lower electrode plate 12 disposed in this order from top to bottom. That is, the bistable liquid crystal layer is disposed between the upper electrode plate 11 and the lower electrode plate 13. The upper electrode plate 11 includes a first substrate and a plurality of first electrodes disposed on a lower surface of the first substrate, and the adjacent two first electrodes are adjacent to each other and do not overlap each other. The lower electrode plate 12 includes a second substrate and a plurality of second electrodes disposed on an upper surface of the second substrate, and the adjacent two second electrodes are adjacent to each other and do not overlap each other. The bistable liquid crystal layer 13 includes a mixture of a cholesteric liquid crystal and a polymer structure, and further includes an optical rotatory agent for controlling the pitch of the cholesteric liquid crystal liquid crystal. It should be noted that the first electrode plate 11 and the second electrode plate 12 are all transparent electrode plates. For example, the first electrode and the second electrode are both transparent electrodes, and the first substrate and the second substrate may be PET films. Glass layer, COP, PI.

Regarding the first electrode and the second electrode, it should be noted that the plurality of first electrodes and the plurality of second electrodes are all connected to the corresponding IO ports of the controller, and the controller can control the first electrodes and the first electrodes through the respective IO ports thereof The working mode of the two electrodes (touch mode and display driving mode), that is, the controller can control the working modes of the first electrode and the second electrode in a time-sharing manner. For example, when performing the steady state display, the controller controls the plurality of first electrodes and the plurality of second electrodes to be in the touch mode, that is, the first electrode and the second electrode are set as the touch electrodes, for example, the controller One electrode outputs a touch driving signal, and at the same time, a signal of the second electrode is collected. At this time, the first electrode is a transmitting electrode, and the second electrode is a receiving electrode. Of course, in other embodiments, the controller may also output a touch driving signal to the second electrode, and simultaneously acquire a signal of the first electrode. At this time, the second electrode is a transmitting electrode, and the first electrode is a receiving electrode. When the display changes, the controller controls the plurality of first electrodes and the plurality of second electrodes to be in the display driving mode, that is, the first electrode and the second electrode are set as display driving electrodes, for example, the controller outputs the display to the first electrode a driving signal (for example, a 12V high level signal), and simultaneously outputting a ground signal (GND) to the second electrode. At this time, the upper electrode plate is at a high level, and the lower electrode plate is unified to GND, thereby making a bistable liquid crystal layer. The cholesteric liquid crystal in 13 is adjusted in direction to clear the display content. Of course, in other embodiments, the controller may also output a ground signal (GND) to the first electrode, and at the same time, output a display driving signal (for example, a 12V high level signal) to the second electrode, and at this time, the display may also be performed. The content is emptied.

In the technical solution of the embodiment, the touch module and the display module are integrated, that is, the touch module and the display module share the upper and lower electrode plates. Therefore, on the one hand, the touch display panel is thinned. The structure and thickness, so that the material cost can be saved, and the handwriting display function can be realized by the touch force with less force; on the other hand, since the electrodes on the upper and lower electrode plates are in the touch mode during writing, The bistable liquid crystal layer is in a state of steady state display without power-on, so that the interference of the touch screen caused by the voltage fluctuation of the display module during the operation of the touch module in the prior art can be avoided.

Referring to FIG. 2, in the upper electrode plate, the plurality of first electrodes 111 are strip electrodes, and the plurality of first electrodes 111 are arranged in parallel in the first direction. Referring to FIG. 3, in the lower electrode plate, the plurality of second electrodes 121 are also strip electrodes, and the plurality of second electrodes 121 are arranged in parallel in the second direction. Preferably, the first direction is the X direction and the second direction is the Y direction, that is, the first direction is perpendicular to the second direction. Of course, in other embodiments, the first direction and the second direction may also be non-parallel directions of any angle.

Further, in conjunction with FIG. 3, the second electrode 121 includes a first module 1211 and a second module 1212, and the second module 1212 is at least partially disposed on the upper surface, the lower surface, and the left side of the first module 1211, and the first module 1211 is a dummy electrode in the touch mode, that is, when the second electrode 121 serves as a transmitting electrode, the controller only outputs a touch driving signal (for example, a 5V voltage signal) to the second module 1212, and A module 1211 outputs a zero voltage. At this time, the first module 1211 is equivalent to a floating block; when the second electrode 121 is used as a receiving electrode, the controller detects only the signal on the second module 1212 without detecting the first module 1211. The signal, at this time, the first module 1211 is also equivalent to the floating block. Finally, it should be noted that the first module in the second electrode 121 is only a dummy electrode in the touch mode, and is not a dummy electrode in the display driving mode. In this way, on the one hand, it is possible to avoid the situation that the capacitance of the first electrode and the second electrode is too large due to the excessive area of the first electrode and the second electrode when the contact position is detected, so that the controller cannot detect the coordinates of the touch position; When the screen needs to be cleared, the upper electrode plate and the lower electrode plate are both high level or low level, so that all the cholesteric liquid crystals of the bistable liquid crystal layer can be adjusted in direction.

The above is just one embodiment of a second electrode, it being understood that in other embodiments, the second module may be disposed only on the upper or lower surface of the first module. Of course, in other examples, the second module may be disposed on the left or right or the front or rear surface, or at the same time on the six surfaces of the first module, in addition to being disposed on the upper or lower surface of the first module. Upper, ie, the second module encloses the first module in the middle.

In an optional embodiment, the dummy electrode may also be disposed in the first electrode. At this time, the first electrode includes a third module and a fourth module, and the fourth module is at least partially disposed on the upper surface of the third module and/or Or a lower surface, and the third module is a dummy electrode in the touch mode. Moreover, further, the fourth module is also at least partially disposed on the left and/or right side and/or the front and/or the back of the third module.

4 is a structural diagram of a first embodiment of the handwriting device of the present invention. The handwriting device of the embodiment includes a substrate (not shown), a touch display panel 10, a controller 20, and a memory 30. The touch display panel 10 is disposed on the substrate, and the structure thereof can be referred to the foregoing description, and details are not described herein. The controller 20 is configured to control the first electrode and the second electrode in the touch display panel 10 to be in a touch mode during steady state display, and detect coordinate information of the user's touch pressure to form handwriting information, and at the same time, due to the user's The cholesteric liquid crystal at the touch pressure position is deflected by the mechanical deformation force, thereby realizing the handwriting display function. In addition, after acquiring the coordinate information, the controller 20 can notify the host of the coordinate information through various communication methods, and the host can display the coordinate information in real time in other displays or send it into the memory 30 for storage.

The following describes the working process of the handwriting device: when writing on the touch display panel by a writing pen or a human hand, the electric field formed between the first electrode and the second electrode at the contact position changes due to the touch pressure, The user's touch position coordinates can be determined by judging the first electrode and the second electrode whose electric field changes. In addition, when both the first electrode plate and the second electrode plate are transparent electrode plates, the cholesteric liquid crystal remains in the first zero field steady state before writing, and the touch display panel is black when the user is in touch. When writing on the display panel, the cholesteric liquid crystal at the writing position will have the lowest energy, thereby triggering the second zero field steady state, at which time the visible light will transmit the cholesteric liquid crystal in the second zero field steady state, and The lower electrode plate is incident on the substrate such that the handwriting written by the user presents the color of the substrate. It should be noted that the color of the substrate can be set according to actual needs, preferably white, so as to realize the writing method of white characters on a black background.

In addition, the memory 30 is used to store the handwriting information. Thus, when it is necessary to view the previous handwriting information, the handwriting information stored in the memory 30 can be called, thereby realizing the handwriting recording function of the handwriting device.

Further, the controller 20 is further configured to control the first electrode and the second electrode to be in a display driving mode to perform clearing when determining that writing is completed. The writing mode may include a single-word writing mode and a continuous writing mode, wherein, in the single-word writing mode, the controller 20 determines that the writing completion process may be: if it is determined that new coordinate information is not detected within the preset time period, it is determined that the writing is completed. For example, when the user selects the single-word writing mode, the controller 20 determines that the coordinate information is interrupted after the coordinate information is continuously received, and determines that the predetermined time period (for example, 2 seconds), and still no coordinate information is uploaded, and the single word can be recognized. Writing is complete. At this point, the touch function is turned off, the display automatically clears the screen, and then the touch function is turned back on, and the user can continue to write the next word. In the continuous writing mode, the controller 20 determines that the writing completion process may be: if it is determined that a specific handwriting is acquired, it is determined that the writing is completed. For example, when the user selects the continuous writing mode, when the end signal is not received, the controller is always in the process of receiving/waiting to receive the coordinate information, the display screen remains unclear, and when the user finishes writing continuously, the specific symbol can be written. (User can modify or set in advance) as the end of writing signal, such as "☆", etc. At this time, the touch function is turned off, the display automatically clears the screen, and then the touch function is turned back on, and the user can continue writing.

Preferably, the controller 20 is configured to output a touch driving signal to the first electrode or the second electrode in the touch mode, and output a display driving signal to the first electrode or the second electrode in the display driving mode, and the touch The control drive signal is smaller than the display drive signal. In order to avoid writing for the user, the touch pressure causes the cholesteric liquid crystal in the bistable liquid crystal layer to deflect, affecting the performance of the handwriting device, and the touch driving signal is smaller than the display driving signal, for example, the touch driving signal is low. At 3.3V, preferably 1.8V, the display drive signal is 12V.

FIG. 5 is a flowchart of a touch display method according to an embodiment of the present invention. The touch display method of the embodiment includes:

In step S10, the first electrode and the second electrode of the touch display panel are controlled to be in a touch mode, for example, the touch driving signal is output to the first electrode or the second electrode in the touch mode, where The touch display panel is disposed on the substrate, and the structure of the touch display panel can be referred to the foregoing description, and details are not described herein;

Step S20. Detect coordinate information of the user's touch pressure to form handwriting information.

In this embodiment, when the user touches the touch display panel, on the one hand, since the first electrode and the second electrode are both in the touch mode, the coordinate information of the touch position can be detected; on the other hand, the touch pressure The cholesteric liquid crystal at the position is deflected by the mechanical deformation force, thereby realizing the handwriting display function.

The touch display method of the present invention further includes:

When it is determined that the writing is completed, controlling the first electrode and the second electrode to be in a display driving mode, for example, outputting a display driving signal to the first electrode or the second electrode in the display driving mode to perform clearing, and, The touch drive signal is smaller than the display drive signal. The method for determining the completion of the writing may include: determining that the writing is completed if the new coordinate information is not detected within the preset time period in the single-word writing mode; and determining that the specific handwriting is obtained in the continuous writing mode, Make sure the writing is complete.

In this embodiment, when it is determined that the writing is completed, the touch function is turned off, that is, the first electrode and the second electrode are converted from the touch mode to the display driving mode, and at this time, the display screen is automatically cleared. You can then turn the touch function back on and the user can continue writing.

In an optional embodiment, the touch display method of the present invention further includes: storing the handwriting information. In this embodiment, when it is necessary to view the previous handwriting information, the handwriting information stored in the memory can be called, thereby realizing the handwriting recording function of the handwriting device.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any tampering, equivalent substitution, improvement, etc., within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

A touch display panel, comprising: an upper electrode plate, a lower electrode plate, and a bistable liquid crystal layer disposed between the upper electrode plate and the lower electrode plate, wherein the upper electrode plate includes a substrate and a plurality of first electrodes disposed on a lower surface of the first substrate, the lower electrode plate including a second substrate and a plurality of second electrodes disposed on an upper surface of the second substrate, and The two adjacent first electrodes are close to each other and do not overlap each other, and the adjacent two second electrodes are close to each other and do not overlap each other.
The touch display panel according to claim 1, wherein the first electrode and the second electrode are strip electrodes, and the plurality of first electrodes are arranged in parallel along the first direction, and the plurality of The two electrodes are arranged in parallel in the second direction, and the first direction and the second direction are non-parallel directions.
The touch display panel according to claim 2, wherein the second electrode comprises a first module and a second module, the second module being at least partially disposed on an upper surface of the first module and/or Or a lower surface, and the first module is a dummy electrode in the touch mode; or

The first electrode includes a third module and a fourth module, the fourth module is at least partially disposed on an upper surface and/or a lower surface of the third module, and the third module is in a touch mode False electrode.
The touch display panel according to claim 3, wherein the second module is further disposed at least partially on a left side surface and/or a right side surface of the first module; or

The fourth module is also at least partially disposed on a left side and/or a right side of the third module.
The touch display panel according to claim 2, wherein the first direction is perpendicular to the second direction.
The touch display panel according to claim 1, wherein the first substrate and the second substrate are both a PET film, a glass layer, a COP or a PI, and the first electrode and the second electrode All are transparent electrodes.
A handwriting device, comprising:

Substrate

a touch display panel disposed on the substrate, the touch display panel being the touch display panel according to any one of claims 1-6;

And a controller, configured to control the first electrode and the second electrode to be in a touch mode during steady state display, and detect coordinate information of the user's touch pressure to form handwriting information.
A handwriting device according to claim 7, wherein

The controller is further configured to control the first electrode and the second electrode to be in a display driving mode to perform clearing when determining that writing is completed.
The handwriting device according to claim 7, further comprising:

a memory for storing the handwriting information.
A handwriting device according to claim 8, wherein

The controller is configured to output a touch driving signal to the first electrode or the second electrode in the touch mode, and output a display driving signal to the first electrode or the second electrode in the display driving mode, and the touch The drive signal is smaller than the display drive signal.
A handwriting device according to claim 8, wherein

The controller is configured to determine, in the single-word writing mode, that if the new coordinate information is not detected within the preset time period, the writing is completed; in the continuous writing mode, if it is determined that the specific handwriting is obtained, the writing is completed. .
The handwriting device according to claim 7, wherein the substrate is a white substrate.
A touch display method, comprising:

In the steady state display, the first electrode and the second electrode of the touch display panel are controlled to be in a touch mode, wherein the touch display panel is disposed on the substrate, and the touch display panel is claim 1-6 The touch display panel of any one of the above;

The coordinate information of the user's touch pressure is detected to form handwriting information.
The touch display method according to claim 13, further comprising:

When it is judged that the writing is completed, the first electrode and the second electrode are controlled to be in a display driving mode to perform clearing.
The touch display method according to claim 13, further comprising:

The handwriting information is stored.
The touch display method according to claim 14, wherein

The step of controlling the first electrode and the second electrode of the touch display panel to be in the touch mode is:

Controlling the first electrode and the second electrode of the touch display panel in a touch mode, and outputting a touch driving signal to the first electrode or the second electrode in the touch mode;

The step of controlling the first electrode and the second electrode to be in a display driving mode includes:

Controlling the first electrode and the second electrode to be in a display driving mode, and outputting a display driving signal to the first electrode or the second electrode in the display driving mode, the touch driving signal being smaller than the display driving signal.
The touch display method according to claim 14, wherein the step of determining completion of writing comprises:

In the single-word writing mode, if it is determined that no new coordinate information is detected within the preset time period, it is determined that the writing is completed;

In the continuous writing mode, if it is judged that a specific handwriting is obtained, it is determined that the writing is completed.