TWM553011U - Cholesteric LCD electronic notepad - Google Patents

Description

Cholesterol liquid crystal electronic writing board

The present invention relates to a cholesteric liquid crystal electronic writing board, and more particularly to a cholesteric liquid crystal electronic writing board having a pressure sensitive touch sensing panel.

The existing electronic writing board, such as a cholesterol liquid crystal writing board, uses pressure to change the state of the cholesteric liquid crystal, thereby displaying a picture. Therefore, the user can use his finger to apply pressure to the cholesterol liquid crystal writing board to leave a written word or drawing on the cholesterol liquid crystal writing board. In the process of painting and calligraphy, the writing image can be displayed without any power supply.

After the painting is finished, the user presses the clear button to control the output voltage of the power driving unit in the cholesterol liquid crystal writing board, and the painting image on the entire panel can be cleared. Therefore, the electronic tablet allows the user to repeat writing. However, the existing electronic writing board cannot detect the writing track of the user as in the conventional touch type liquid crystal display panel.

The technical problem to be solved by the present invention is to provide a cholesteric liquid crystal electronic writing board having a touch sensing panel disposed under the liquid crystal display panel for sensing the touch position.

In order to solve the above technical problem, one of the technical solutions adopted by the present invention is to provide a cholesteric liquid crystal electronic writing board, which comprises a liquid crystal display panel and a touch sensing panel. The liquid crystal display panel has a flexible substrate, an inner substrate, two conductive layers between the flexible substrate and the inner substrate, and a cholesteric liquid crystal layer sandwiched between the two conductive layers, wherein Flexible substrate has A display surface for receiving a painting pressure and displaying a trajectory of the painting according to a moving path of the painting pressure. The touch sensing panel is combined with the liquid crystal display panel and located on a side of the liquid crystal display panel opposite to the display surface for sensing the painting track. The touch sensing panel includes a bottom plate and two sensing electrode layers, wherein the two sensing electrode layers are disposed between the bottom plate and the inner substrate. One of the sensing electrode layers is located on the bottom plate, and the other sensing electrode layer and one of the conductive layers are respectively disposed on opposite surfaces of the inner substrate.

One of the beneficial effects of the present invention is that the cholesterol liquid crystal electronic writing board provided by the present invention can be sensed by the technical solution of "setting the touch sensing panel on the side opposite to the display surface of the liquid crystal display panel". The liquid crystal display panel is applied to all positions of the painting pressure. In addition, in the cholesteric liquid crystal electronic writing board of the present embodiment, one of the sensing electrode layers of the touch sensing panel and one of the conductive layers of the liquid crystal display panel are disposed on opposite surfaces of the same inner substrate, so that cholesterol can be obtained. The thickness of the liquid crystal electronic writing board is thinned, and the production cost is lowered.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings. However, the drawings are provided for reference and description only, and are not intended to limit the creation.

1‧‧‧Cholesterol LCD electronic writing board

10‧‧‧LCD panel

S1‧‧‧ display surface

S2‧‧‧ inner surface

100‧‧‧Flexible substrate

101‧‧‧ Inner substrate

101a‧‧‧ top

101b‧‧‧ bottom

102a, 102b‧‧‧ conductive layer

113‧‧‧ Piezoelectric layer

PX1, PX2‧‧‧ pixel electrode

103‧‧‧Cholesterol liquid crystal layer

11‧‧‧Touch sensing panel

110‧‧‧floor

111a, 111b‧‧‧ sensing electrode layer

112‧‧‧ spacers

12‧‧‧Processing Control Module

13‧‧‧Voltage drive unit

FIG. 1 is a partial cross-sectional view showing a cholesteric liquid crystal electronic writing board according to an embodiment of the present invention.

2 is a partial cross-sectional view showing the pressure of the cholesteric liquid crystal electronic writing board of FIG. 1 under the pressure of painting.

3 is a partial cross-sectional view showing a cholesteric liquid crystal electronic tablet according to another embodiment of the present invention.

4 is a partial top plan view of one of the conductive layers of the liquid crystal display panel of FIG. 3.

FIG. 5 is a partial cross-sectional view showing a cholesteric liquid crystal electronic writing board according to still another embodiment of the present invention.

The following is a description of an embodiment of the "cholesterol liquid crystal electronic tablet" disclosed in the present disclosure by a specific embodiment, and those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in the present specification. The present invention may be implemented or applied in various other specific embodiments, and various details in the present specification may be made based on different viewpoints and applications, and various modifications and changes may be made without departing from the spirit of the present invention. In addition, the drawings of the present creation are only for the purpose of simple illustration, and are not stated in advance according to the actual size. The following embodiments will further explain the related technical content of the present invention, but the disclosure is not intended to limit the scope of protection of the present invention.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a partial cross-sectional view showing a cholesteric liquid crystal electronic writing board according to an embodiment of the present invention. 2 is a partial cross-sectional view showing the pressure of the cholesteric liquid crystal electronic writing board of FIG. 1 under the pressure of painting.

In the present embodiment, the cholesteric liquid crystal electronic writing board 1 includes a liquid crystal display panel 10 and a touch sensing panel 11, wherein the liquid crystal display panel 10 has a movement path for receiving a painting pressure and displaying a calligraphy trajectory according to a moving path of the painting pressure. The display surface S1 is combined with the liquid crystal display panel 10 and located on the side of the liquid crystal display panel 10 opposite to the display surface S1 to sense the trajectory of the painting.

Specifically, as shown in FIG. 1 , the liquid crystal display panel 10 has a flexible substrate 100 , an inner substrate 101 , two conductive layers 102 a and 102 b between the flexible substrate 100 and the inner substrate 101 , and A cholesteric liquid crystal layer 103 interposed between the two conductive layers 102a, 102b.

The flexible substrate 100 is a soft transparent plastic substrate that can be deformed and bent by pressure. The material constituting the flexible substrate 100 may be polyethylene terephthalate (PET) or other polymer materials. In the present embodiment, the flexible substrate 100 has a display surface S1 for receiving painting pressure and an inner surface S2 opposite to the display surface S1.

The inner substrate 101 is disposed opposite to the flexible substrate 100 and separated by a predetermined distance. The inner substrate 101 may be a plastic substrate that is transparent or opaque by itself. In the present embodiment, the material constituting the inner layer substrate 101 is shaped to be subjected to painting pressure. Variable flexible materials such as polyethylene terephthalate (PET) or other polymeric materials.

In addition, the inner substrate 101 has a top surface 101a and a bottom surface 101b opposite to the top surface. When the inner substrate 101 is a transparent plastic substrate, the liquid crystal display panel 10 further includes an absorbing layer (not labeled) disposed on the bottom surface 101b of the inner substrate 101. In an embodiment, the appearance of the absorbing layer is black or other colors that are close to black, and may be formed on the inner substrate 101 by spray coating. In another embodiment, when the inner substrate 101 itself is an opaque (eg, black) plastic substrate, the absorbing layer may also be omitted.

One of the two conductive layers 102a, 102b is disposed on the inner surface S2 of the flexible substrate 100. That is, the conductive layer 102a is located on the opposite side of the flexible substrate 100 from the display surface S1. The other conductive layer 102b is disposed on the top surface 101a of the inner substrate 101. In other words, the two conductive layers 102a, 102b are located between the flexible substrate 100 and the inner substrate 101 and are opposed to each other.

The material constituting the conductive layers 102a, 102b is, for example, a transparent conductive film. For example, a material constituting the conductive layers 102a, 102b such as indium tin oxide or a conductive polymer. In other embodiments, the material constituting the conductive layer 102b on the top surface 101a of the inner substrate 101 may also be a dark conductive material such as graphene. When the material constituting the conductive layer 102b is a dark conductive material, the material constituting the inner substrate 101 may be a transparent material.

In this embodiment, the conductive layers 102a, 102b are each a continuous film layer. However, in other embodiments, the conductive layers 102a, 102b also have a plurality of electrode portions that are separated from one another, depending on actual needs. The shape and material of the conductive layers 102a, 102b are not limited in this creation.

Referring to FIG. 1 , the cholesteric liquid crystal layer 103 is interposed between the flexible substrate 100 and the inner substrate 101 . Further, the cholesteric liquid crystal layer 103 is located between the two conductive layers 102a, 102b, and the liquid crystal molecules in the cholesteric liquid crystal layer 103 can be steered by applying pressure or an electric field. Liquid crystal molecules can be in a focal conic state (focal conic state) or planar state two stable states, called bistable. Before the user writes, the liquid crystal molecules can be set to be in a focal conic state, so that the display surface S1 of the liquid crystal display panel 10 appears black.

When the user applies an object, such as a finger or other object, applying a painting pressure to the display surface S1 of the flexible substrate 100, the state of the liquid crystal molecules is changed from the focal conic state to the planar state, thereby presenting on the display surface S1. White (or color) calligraphy and painting tracks.

In other embodiments, the liquid crystal display panel 10 may also be a color cholesteric liquid crystal display panel. That is to say, the liquid crystal display panel 10 includes three layers of cholesteric liquid crystal layers which can respectively reflect blue light, green light and red light.

Referring to FIG. 1 , the touch sensing panel 11 can be a resistive touch panel, a capacitive touch panel, a piezoelectric touch panel, etc., and can detect changes in resistance, capacitance, current, and voltage values. The position at which the user applies the painting pressure to the display surface S1 is detected.

The touch sensing panel 11 of the present embodiment is described by taking a resistive touch panel as an example. The touch sensing panel 11 of the present embodiment includes a bottom plate 110 and two sensing electrode layers 111a and 111b.

In this embodiment, the bottom plate 110 may be a plastic plate or a glass plate. The two sensing electrode layers 111a and 111b are respectively disposed on the bottom plate 110 and the inner substrate 101, and are located between the bottom plate 110 and the inner substrate 101. Furthermore, one of the sensing electrode layers 111a is located on the bottom plate 110, and the other sensing electrode layer 111b is located on the bottom surface 101b of the inner substrate 101. In other words, the sensing electrode layer 111b and one of the conductive layers 102b are disposed on opposite surfaces of the inner substrate 101, respectively.

In other words, in the present embodiment, one of the sensing electrode layers 111b of the touch sensing panel 11 and one of the conductive layers 102b of the liquid crystal display panel 10 share the same inner substrate 101.

Compared with directly aligning the touch sensing panel 11 with the liquid crystal display panel 10, the overall volume of the cholesteric liquid crystal electronic tablet 1 provided by the present invention can be smaller, and the production cost can be reduced. In addition, the touch sensing panel 11 and the liquid crystal display panel are directly connected The 10 stitching may cause the alignment accuracy to be poor due to the sliding of the two, thereby affecting the accuracy of the touch sensing panel 11 sensing the pressure position of the painting. However, in the present embodiment, one of the sensing electrode layers 111b of the touch sensing panel 11 is directly formed on the inner substrate 101 of the liquid crystal display panel 10, so that the touch sensing panel can be avoided during the bonding. 11 and the liquid crystal display panel 10 slide each other to cause a problem of deterioration in alignment accuracy.

In addition, the bottom plate 110 and the inner substrate 101 of the present embodiment are separated from each other by a predetermined distance. Further, the touch sensing panel 11 of the embodiment includes a plurality of spacers 112. A plurality of spacers 112 are disposed between the bottom plate 110 and the inner layer substrate 101 such that the bottom plate 110 and the inner layer substrate 101 are spaced apart from each other. Accordingly, in the case where the painting pressure is not applied to the liquid crystal display panel 10, the two sensing electrode layers 111a, 111b respectively located on the bottom plate 110 and the inner substrate 101 do not contact each other.

Please refer to Figure 1 again. The cholesteric liquid crystal electronic tablet 1 of the present embodiment further includes a process control module 12. The processing control module 12 is electrically connected to the two sensing electrode layers 111a, 111b to receive a sensing material transmitted by the two sensing electrode layers 111a, 111b.

Referring to FIG. 2, when the user applies a painting pressure to the liquid crystal display panel 10 by using a finger, the flexible substrate 100 and the inner substrate 101 are recessed inward by the writing pressure, forcing the two separated sensing electrode layers 111a, 111b is in contact with each other to generate a sensing material. The aforementioned sensing data may include a current value, a resistance value, or a change in a voltage value. After receiving the sensing data, the processing control module 12 may obtain a location data corresponding to the sensing data according to the sensing data, and the location data may include a plurality of location coordinates constituting the painting track. In addition, the processing control module 12 may have a storage unit (not shown) for storing location data.

In addition, please refer to Figure 1 again. The cholesteric liquid crystal electronic tablet of the present embodiment further includes a voltage driving unit 13 electrically connected to the process control module 12. The voltage driving unit 13 is electrically connected to the two conductive layers 102a, 102b of the liquid crystal display panel 10. In an embodiment, the process control module 12 controls the voltage drive according to a reset command. The unit 13 applies a recovery voltage to the two conductive layers 102a, 102b to generate an electric field in the cholesteric liquid crystal layer 103, thereby returning a portion of the liquid crystal molecules in a changed state to an initial state. The aforementioned restoration command may be transmitted by the user to the process control module 12 through an operation interface.

When the voltage driving unit 13 applies a recovery voltage to the two conductive layers, the liquid crystal molecules which are originally converted into a planar state by the painting pressure return to the focal conic state by the electric field. Therefore, the writing trajectories originally presented on the display surface S1 are all cleared.

Please refer to FIG. 3 and FIG. 4. 3 is a partial cross-sectional view showing a cholesteric liquid crystal electronic tablet according to still another embodiment of the present invention. 4 is a partial top plan view of one of the conductive layers of the liquid crystal display panel of FIG. 3.

Please refer to FIG. 3 and FIG. 4 first. The difference between the embodiment and the embodiment of FIG. 1 is that each of the conductive layers 102a and 102b (the conductive layer 102a of FIG. 4 is taken as an example) includes a plurality of pixel electrode portions PX1 arranged in an array. Similarly, the conductive layer 102b on the inner substrate 101 also includes a plurality of pixel electrode portions PX2 which are separated from each other and arranged in an array. The plurality of pixel electrode portions PX2 correspond to the plurality of pixel electrode portions PX1, respectively. The pixel electrode portion PX1 and the pixel electrode portion PX2 are electrically connected to the voltage driving unit 13 through a line.

In addition, the voltage driving unit 13 can individually apply a voltage to one of the corresponding pixel electrode portions PX1 and the pixel electrode portion PX2, so that the liquid crystal molecules located between the two pixel electrode portions PX1 and PX2 to which the voltage is applied are turned. To partially clear the painting track or to partially display the pattern.

In other words, the voltage driving unit 13 can control the local liquid crystal molecules in the cholesteric liquid crystal layer 103 to change from a planar state to a focal conic state by changing the voltage to partially remove the trajectory of the painting, and can also change the local liquid crystal molecules from the focal conic state to the plane. State to redisplay the trajectory of calligraphy and painting.

Specifically, the process control module 12 can also receive a display command input by the user through the operation interface. The processing control module 12 is based on the display instruction and the location The control voltage driving unit 13 applies a control voltage to the plurality of sets of the pixel electrode portion PX1 and the pixel electrode portion PX2 corresponding to the positional material to change the state of the partial liquid crystal molecules, thereby redisplaying the painting track.

In other embodiments, the top view pattern of the conductive layer 102a may include a plurality of conductive lines extending in the X direction, and the top view pattern of the conductive layer 102b includes a plurality of conductive lines extending in the Y direction, or vice versa. The present creation does not limit the shape of the conductive layers 102a, 102b as long as it can correspond to preset position coordinates.

In addition, in the embodiment, the sensing electrode layer 111a located on the bottom plate 110 may include a plurality of first electrode lines extending along the X direction, and the sensing electrode layer 111b located on the bottom surface 101b of the inner layer substrate 101 may be A plurality of second electrode lines extending in the Y direction are included. It should be noted that the top view patterns of the two sensing electrode layers 111a, 111b can be designed according to actual needs, and the creation is not limited.

Referring to FIG. 5, a partial cross-sectional view of a cholesteric liquid crystal electronic tablet according to another embodiment of the present invention is shown. In the embodiment of FIG. 5, the touch sensing panel 11 is a piezoelectric touch panel. That is, the touch sensing panel 11 of the present embodiment further includes a piezoelectric material layer 113 between the two sensing electrode layers 111a, 111b. In the present embodiment, the piezoelectric material layer 113 directly contacts the two sensing electrode layers 111a, 111b.

In this embodiment, when the liquid crystal display panel 10 is subjected to the painting pressure, the inner substrate 101 is also depressed by the drawing pressure and is pressed downward to apply pressure to the piezoelectric material layer 113, thereby generating a piezoelectric current. That is to say, in the present embodiment, the sensing data generated by the touch sensing panel 11 may include a plurality of sets of piezoelectric current values generated by the piezoelectric material layer 113 receiving the painting pressure. On the other hand, the process control module 12 can determine the position coordinates of the painting pressure based on the plurality of sets of piezoelectric current values, thereby obtaining position data corresponding to the calligraphy track. In one embodiment, the larger the piezoelectric current value, the greater the pressure of the painting applied to the liquid crystal display panel 10.

The conductive layers 102a, 102b in the embodiment of FIG. 5 can also be replaced with the conductive layers 102a, 102b shown in FIG. In this case, when the user inputs a display command through the operation interface, the process control module 12 can control the voltage drive according to the location data. The unit 13 applies a control voltage to the plurality of sets of the pixel electrode portion PX1 and the pixel electrode portion PX2 corresponding to the positional material to change the state of the partial liquid crystal molecules, thereby redisplaying the calligraphy trajectory.

[Advantageous Effects of Embodiments]

The beneficial effect of the present invention is that the cholesteric liquid crystal electronic writing board provided by one of the technical solutions of the present invention can be provided by the technical means of "setting the touch sensing panel on the side opposite to the display surface of the liquid crystal display panel" All positions where the painting pressure is applied to the liquid crystal display panel are sensed.

In addition, in the cholesteric liquid crystal electronic writing board of the present embodiment, one of the sensing electrode layers 111b of the touch sensing panel 11 and the one of the conductive layers 102b of the liquid crystal display panel 10 are disposed on the same inner substrate 101. The surface can thin the overall thickness of the cholesteric liquid crystal electronic tablet 1 and reduce the production cost.

In the cholesteric liquid crystal electronic writing board 1 of the present embodiment, one of the sensing electrode layers 111b of the touch sensing panel 11 is directly formed, as compared with the touch sensing panel and the liquid crystal display panel. On the inner substrate 101 of the liquid crystal display panel 10, the problem that the alignment accuracy is lowered due to the sliding of the touch sensing panel 11 and the liquid crystal display panel 10 at the time of bonding can be avoided.

The above disclosure is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, any equivalent technical changes made by using the present specification and the contents of the drawings are included in the application for this creation. Within the scope of the patent.

1‧‧‧Cholesterol LCD electronic writing board

10‧‧‧LCD panel

S1‧‧‧ display surface

S2‧‧‧ inner surface

100‧‧‧Flexible substrate

101‧‧‧ Inner substrate

101a‧‧‧ top

101b‧‧‧ bottom

102a, 102b‧‧‧ conductive layer

103‧‧‧Cholesterol liquid crystal layer

11‧‧‧Touch sensing panel

110‧‧‧floor

111a, 111b‧‧‧ sensing electrode layer

112‧‧‧ spacers

12‧‧‧Processing Control Module

13‧‧‧Voltage drive unit

Claims (7)

A cholesteric liquid crystal electronic writing board comprising: a liquid crystal display panel having a flexible substrate, an inner layer substrate, two conductive layers between the flexible substrate and the inner layer substrate, and a clip a cholesteric liquid crystal layer disposed between the two conductive layers, wherein the flexible substrate has a display surface for receiving a painting pressure and displaying a trajectory of a painting according to a moving path of the painting pressure; and a touch sensing panel for sensing the trajectory of the painting, which is combined with the liquid crystal display panel and disposed on a side of the liquid crystal display panel opposite to the display surface, wherein the touch sensing panel comprises a bottom plate and two sensing electrode layers, and two of the sensing electrode layers are disposed between the bottom plate and the inner substrate; wherein one of the sensing electrode layers is located on the bottom plate, and the other The sensing electrode layer and one of the conductive layers are respectively disposed on opposite surfaces of the inner substrate. The cholesteric liquid crystal electronic tablet according to claim 1, wherein the material constituting the inner layer substrate is a flexible material which is deformable by the pressure of the painting. The cholesteric liquid crystal electronic writing board of claim 1, further comprising a processing control module and a voltage driving unit electrically connected between the processing control module and the two conductive layers, wherein a portion of the liquid crystal molecules in the cholesteric liquid crystal layer receive the painting pressure to change state, and the process control module controls the voltage driving unit according to a reset command to apply a reset voltage to the two conductive layers to enable the Part of the liquid crystal molecules that change state return to the initial state. The cholesterol liquid crystal electronic writing board according to claim 3, wherein the processing control The module is electrically connected to the two sensing electrodes to receive a sensing data, and the processing control module obtains a location data corresponding to the sensing data according to the sensing data. The location data includes a plurality of location coordinates that make up the trajectory of the calligraphy. The cholesteric liquid crystal electronic writing board of claim 4, wherein the touch sensing panel further comprises a piezoelectric material layer disposed between the two sensing electrode layers, and the sensing data The plurality of sets of piezoelectric current values generated by the piezoelectric material layer receiving the painting pressure are included. The cholesteric liquid crystal electronic writing board according to claim 4, wherein each of the conductive layers includes a plurality of pixel electrode portions arranged in an array to control local liquid crystal molecules in the cholesteric liquid crystal layer to be turned, and The processing control module receives a display command, and controls the voltage driving unit according to the position data to respectively apply a control voltage to the plurality of pixel electrodes corresponding to the position data to redisplay the painting and calligraphy Track. The cholesteric liquid crystal electronic writing board of claim 1, wherein the touch sensing panel further comprises a plurality of spacers disposed between the bottom plate and the inner substrate, so that the bottom plate and the bottom plate are The inner substrate is disposed apart from each other.