WO2012128578A9 - Liquid crystal touch screen panel, and method for producing the liquid crystal touch screen panel - Google Patents

Abstract

The invention relates to a liquid crystal touch screen panel, comprising: a first substrate; a second substrate opposite the first substrate; an electrode pattern unit disposed on the second substrate; and a liquid crystal layer which is made of liquid crystal particles and interposed between the electrode pattern unit and the first substrate. A stimulus applied from an external source onto the first substrate may be sensed based on the variation in the amount of electric charge caused by the external stimulus applied to the first substrate.

Description

Liquid crystal touch screen panel and method for manufacturing the liquid crystal touch screen panel

The present invention relates to a liquid crystal touch screen panel and a method of manufacturing the liquid crystal touch screen panel.

Conventionally, the touch screen has a basic configuration of a liquid crystal or organic EL display panel displaying image information, a touch panel attached or embedded in the display panel, a signal input / output integrated circuit, a device driver, and application software. Currently, a touch method commonly used in a touch screen of a mobile device is a resistive method and a capacitive method.

In the resistive film method, when a user presses a screen, the input is sensed by detecting a change in current and resistance generated when the transparent conductive films are in contact with each other. In this case, the touch screen is a layer in which several layers are stacked on the display panel, and a film made of a scratch-resistant material is formed on the outermost side of the contact area of the hand or the stylus pen, and a film that softens the impact and Overlapping transparent conductive film to sense touch.

However, the resistive film method has a problem in that multi-touch is impossible in terms of function, and the screen clarity is lowered by stacking multiple layers on the display panel.

The capacitance method is a method of determining an input by using a phenomenon in which the intrinsic capacitance of the touch screen is changed by an external stimulus. In general, static electricity in the body causes a change in the capacitance. In other words, the current is applied to the touch screen substrate by coating an electrically conductive material or compound. At this time, when the finger touches the screen, electrons flowing on the tentacle position are attracted to the contact point, and the capacitance of the touch screen at the corresponding point is changed, and a circuit installed at the periphery of the touch screen senses the input and determines the input. .

However, the capacitive method is impossible to input when using a non-conductor rather than a material that induces electrons like a finger. Therefore, input cannot be made using the stylus pen used in the above-described resistive film method, and a finger or a capacitive stylus pen must be used.

Accordingly, there is a need for a touch screen panel capable of single touch and multi touch using a hand, a stylus pen, and other objects while accommodating the advantages of the resistive type and the capacitive type.

According to an embodiment of the present invention, by sensing the external stimulus applied to the substrate based on the amount of charge that changes according to the external stimulus such as pressure applied to the substrate, various types of touch inputs are possible, and the liquid crystal by the external stimulus such as pressure It is an object of the present invention to provide a liquid crystal touch screen panel that can realize multi-gradation according to touch intensity by using an effect of changing capacitance of a cell.

In addition, an embodiment of the present invention by using the organic material liquid crystal molecules having a substation effect or piezoelectric effect to detect the capacitance change or the voltage change to operate independently or added to the existing resistive or capacitive panel It is an object of the present invention to provide a liquid crystal touch screen panel that operates by making a wire.

As a technical means for achieving the above-described technical problem, the liquid crystal touch screen panel according to an embodiment of the present invention is the first substrate, the second substrate disposed to face the first substrate, the electrode disposed on the second substrate A liquid crystal layer comprising liquid crystal molecules interposed between the pattern portion and the electrode pattern portion and the first substrate, wherein the external magnetic pole is applied on the first substrate based on a change in the amount of charge generated by the external magnetic pole applied to the first substrate; Detect.

In addition, the liquid crystal touch screen panel according to another embodiment of the present invention is disposed on the first substrate, the second substrate disposed to face the first substrate, the first electrode disposed below the first substrate, and the upper portion of the second substrate. A second electrode and a liquid crystal layer comprising liquid crystal molecules interposed between the first electrode and the second electrode, the liquid crystal layer being applied on the first substrate based on a change in the charge amount caused by an external stimulus applied to the first substrate. Detect external stimuli.

In addition, according to another embodiment of the present invention, the method for manufacturing a liquid crystal touch screen panel, the method for manufacturing a liquid crystal touch screen panel, the step of depositing the first and second electrodes on the first and second substrate, respectively, Etching to form patterns of the first and second electrodes, applying an alignment layer to the first and second substrates on which the first and second electrodes are formed, respectively, and applying a liquid crystal layer to the first substrate. And forming an adhesive layer on the second substrate and bonding the first substrate and the second substrate to each other, wherein the liquid crystal layer is formed of liquid crystal molecules of the liquid crystal layer according to an external stimulus applied to the first substrate. The arrangement structure is characterized in that it generates a change in the spontaneous polarization direction.

According to any one of the problem solving means of the present invention described above, by sensing the external stimulus applied to the substrate based on the amount of charge that changes according to the external stimulus, such as the pressure applied to the substrate, to enable various types of touch input, Multi-gradation can be realized according to the touch intensity by using the effect of changing the capacitance of the liquid crystal cell by an external stimulus.

In addition, according to any one of the problem solving means of the present invention described above, unlike the conventional capacitive method that only changes the capacitance in accordance with the external stimulus, by inducing the generation of the current by the external stimulus, by detecting the changed current, Since the capacitive structure enables sensing of external stimulus like a resistive film, not only multi-sensing but also sensing by various touch sensors is possible.

In addition, according to any one of the above-described problem solving means of the present invention, unlike the touch screen panel employing the conventional resistive method that is not multi-touch or the conventional capacitive method that is difficult to pen touch recognition, depending on the touch intensity As the spontaneous polarization value of the liquid crystal material changes differently, the gray level of the touch strength can be detected.

1 and 2 illustrate an arrangement of liquid crystal molecules when an external stimulus is applied to a liquid crystal touch screen panel according to an exemplary embodiment of the present invention.

FIG. 3 is a plan view of a matrix array configuration for detecting a signal at a position where an external magnetic pole is applied in a liquid crystal touch screen panel according to an embodiment of the present invention in which first and second electrodes are cross-arranged. to be.

4 to 6 illustrate various configurations of the liquid crystal touch screen panel according to an embodiment of the present invention.

7 illustrates a configuration of a liquid crystal touch screen panel according to another embodiment of the present invention.

8 and 9 illustrate a principle of operation of a liquid crystal touch screen panel to which a liquid crystal or liquid crystal polymer having a banana-type molecular structure or a wedge-shaped molecular structure according to another embodiment of the present invention is applied.

FIG. 10 illustrates another operation principle of a liquid crystal touch screen panel to which a banana type liquid crystal or a liquid crystal polymer is applied according to an embodiment of the present invention.

11 illustrates a liquid crystal of various types of polarization structures according to an embodiment of the present invention.

12 illustrates a configuration of a liquid crystal touch screen panel according to another embodiment of the present invention.

FIG. 13 is a graph illustrating a voltage change with respect to an external stimulus when the liquid crystals forming the liquid crystal layer of FIG. 12 are ferroelectric liquid crystals and nematic liquid crystals, respectively.

14A and 14B are graphs showing currents measured with respect to an applied voltage when the liquid crystals forming the liquid crystal layer of FIG. 12 are ferroelectric liquid crystals and antiferroelectric liquid crystals, respectively.

FIG. 15 is a view for explaining a case where the liquid crystal constituting the liquid crystal layer of FIG. 12 is a ferroelectric liquid crystal and a case where an antiferroelectric liquid crystal is used.

16A and 16B are diagrams illustrating an amount of voltage change with respect to an external stimulus applied to the liquid crystal touch screen panel of FIG. 12.

17 is a flowchart illustrating a method of manufacturing a liquid crystal touch screen panel according to another embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

1 and 2 illustrate an arrangement of liquid crystal molecules when an external stimulus is applied to a liquid crystal touch screen panel according to an exemplary embodiment of the present invention.

As shown in Figs. 1 and 2, organic materials such as a liquid crystal of a banana-type molecular structure (A '), a liquid crystal of a wedge-shaped molecular structure (B'), a ferroelectric liquid crystal, an antiferroelectric liquid crystal (Antiferroelectric) In a liquid crystal touch screen panel (LCTSP) comprising a liquid crystal or a liquid crystal polymer, a banana type having a permanent dipole even at a small amount when an external stimulus such as pressure is applied to a substrate, Liquid crystals having an asymmetric structure, such as wedge-shaped liquid crystals, are easily changed in a spray or bend structure in response to a change in the curvature of the surface substrate, and the direction of the liquid crystal as defined in Equation 1 below. As the net electric dipole is generated in the magnetic direction or in the direction opposite to the director of the liquid crystal (z-axis), charge is accumulated as the macroscopic polarization is induced. This effect is called the flexoelectric effect.

As a dipole moment generated in proportion to the amount of force (pressure) applied to the substrate, polarization may be defined as in Equation 1 below.

Equation 1

는 액정의 기울기 각도,

는 변위 x에 따른 액정 분자들의 기울기 변화를 나타낸다.In Equation 1, e1 is the spray modulus of the liquid crystal, e3 is the bend modulus of the liquid crystal, n is a liquid crystal director indicating the direction of the liquid crystal molecules,

The tilt angle of the liquid crystal,

Denotes a change in the slope of liquid crystal molecules according to the displacement x.

In the case of a liquid crystal having a banana-like molecular structure (A '), a wedge-shaped molecular structure (B'), or a liquid crystal having ferroelectricity, spontaneous polarization is applied when pressure is applied, and thus a voltage is generated when a force is applied parallel to the polarization direction. . This effect is called the piezoelectric effect.

[Revision under Rule 91 09.07.2012]
Equation 2

Regarding spontaneous polarization in Equation 2, the first term is a term related to the piezoelectric effect, and the second term is a term related to the substation effect.

,

,

,

는 strain이다.[Revision under Rule 91 09.07.2012]
At this time,

,

,

,

Is strain.

FIG. 3 is a plan view of a matrix array configuration for detecting a signal at a position at which an external stimulus is applied in a liquid crystal touch screen panel according to an embodiment of the present invention in which first and second electrodes are cross-arranged. to be. In this case, the arrangement of the electrodes may be modified in various embodiments in various forms.

Hereinafter, the configuration of the liquid crystal touch screen panel to which the above-described piezoelectric effect and the electrodes of the cross-arranged form of FIG. 3 are applied will be described in more detail with reference to FIGS. 4 and 7.

4 to 6 illustrate various configurations of the liquid crystal touch screen panel according to an embodiment of the present invention.

As shown in FIGS. 4A and 4B, the liquid crystal touch screen panel 100 according to an exemplary embodiment of the present invention is disposed to face the first substrate 102 and the first substrate 102. The second substrate 103, the first electrode 105 disposed below the first substrate 102, the second electrode 106 disposed above the second substrate 103, and the first electrode 105; And a liquid crystal layer 104 made of liquid crystal molecules interposed between the second electrodes 106.

Here, the liquid crystal layer 104 includes a liquid crystal of the banana-type molecular structure (A '), a liquid crystal of the wedge-shaped molecular structure (B'), a ferroelectric liquid crystal, an antiferroelectric liquid crystal or a liquid crystal polymer, wherein the liquid crystal polymer is main chain type, side chain It may include any one of the type, cross-linked and dendrimer type. The liquid crystal layer 104 may include a liquid crystal having optical anisotropy birefringence and having one or more phase structures of nematic, smectic, and cholesteric.

In addition, as shown in (a) and (b) of FIG. 5, the liquid crystal touch screen panel 100 according to an exemplary embodiment of the present invention may include the lower part of the first electrode 105 and the second electrode 106. It may further include an insulating layer 107 disposed above each. This may adjust the size of the total capacitance value for the purpose of securing a fixed capacitance value does not change by external stimulation of the total capacitance value of the liquid crystal touch screen panel 100. In this case, the disposed insulating layer may serve as an alignment layer, and may form a separate alignment layer, which is for the purpose of making the initial alignment state of the banana- or wedge-shaped liquid crystal molecules uniform. The more the polarization effect induced by external force becomes stronger.

In addition, as illustrated in FIGS. 6A and 6B, the liquid crystal touch screen panel 100 according to the exemplary embodiment of the present invention may have a second substrate 103 and an upper portion of the second substrate 103. It may further include a third electrode 108 and the insulating layer 107 disposed between the second electrode 106 disposed in the. More specifically, the third electrode 108 is disposed above the second substrate 103, and the insulating layer 107 is disposed above the third electrode 108. This is to achieve the effect of two separate capacitive elements connected in series for the purpose of independently securing a fixed capacitance value that does not change by external stimulation of the total capacitance value of the liquid crystal touch screen panel 100, The capacitance value can be adjusted.

5 to 6, the insulating layer 107 has a constant capacitance and there is no change in permittivity due to external stimulation, thereby obtaining a fixed capacitance value. In addition, the third electrode 108 is an auxiliary electrode, which helps to detect an external stimulus more effectively by increasing energy transfer efficiency.

7 illustrates a configuration of a liquid crystal touch screen panel according to another embodiment of the present invention.

As illustrated in FIG. 7, the liquid crystal touch screen panel 100 according to another exemplary embodiment of the present invention may include a first substrate 102, a second substrate 103 disposed opposite to the first substrate 102, and a first substrate 102. 2, an electrode pattern part 101 disposed on the substrate 103, and a liquid crystal layer 104 made of liquid crystal molecules interposed between the electrode pattern part 101 and the first substrate 102. Here, the electrode pattern part 101 may include a first electrode 105, a second electrode 106, and an insulating layer 107 disposed between the first electrode 105 and the second electrode 106. have. Here, the insulating layer 107 has a constant capacitance, there is no change in the dielectric constant according to the external stimulus can obtain a fixed capacitance value.

The liquid crystal layer 104 of FIG. 7 includes a liquid crystal of a banana-type molecular structure (A '), a liquid crystal of a wedge-shaped molecular structure (B'), a ferroelectric liquid crystal, an antiferroelectric liquid crystal, or a liquid crystal polymer, wherein the liquid crystal polymer is a main chain type, It may include any one of the side chain type, cross-linked and dendrimer type liquid crystal polymer. In addition, the liquid crystal layer 104 may include a liquid crystal having optical anisotropy birefringence and having one or more phase structures of nematec, smectic, and cholesteric.

8 and 9 illustrate a principle of operation of a liquid crystal touch screen panel to which a liquid crystal or liquid crystal polymer having a banana-type molecular structure or a wedge-shaped molecular structure according to another embodiment of the present invention is applied.

As shown in FIGS. 8 and 9, in the structure of a liquid crystal touch screen panel 100 including a liquid crystal or a liquid crystal polymer having a banana-like molecular structure A 'or a wedge-shaped molecular structure B', for example, When pressure is applied to the substrate 102 as an external magnetic pole, the liquid crystal layer 104 generates an elastic deformation in the form of a spray or bend by the pressure applied to the first substrate 102. The elastic deformation in the form of a spray or bend has been described above with reference to FIGS. 1 and 2.

Then, the position on the first substrate 102 to which the pressure is applied can be sensed based on the change ΔC of the capacitance of the electrode pattern portion 101 changed by the elastic deformation. In this case, as shown in FIG. 9, in the case of the liquid crystal touch screen panel 100 including a liquid crystal or a liquid crystal polymer having a wedge molecular structure (B ′), when a pressure is applied to the first substrate 102, the wedge shape The liquid crystal molecules may be aligned in a certain shape and modified.

More specifically, the insulating layer 107 formed between the first electrode 105 and the second electrode 106 has a constant capacitance, and the capacitance changes as the amount of charge changes with pressure. In addition, when the first electrode 105 and the second electrode 106 are subjected to an external pressure applied to a specific site, and a charge is generated by the dipole induction, the capacitance of the insulating layer 107 changes according to the change in the amount of charge. To detect the position of the part where the pressure is applied.

At this time, since the amount of charge induced is proportional to the pressure, multi-gradation can be realized according to the strength of the pressure. In addition, capacitive multi-touch is possible, and a piezoelectric effect is generated according to the action of pressure, so that the touch sensor can be operated with a stylus pen or other objects.

In addition, since the liquid crystal touch screen panel 100 of the present invention uses polarization through elastic deformation of liquid crystal molecules, the liquid crystal touch screen panel 100 differs from the conventional method using a piezoelectric effect in which electric polarization is generated by an external pressure. There is. In addition, unlike the conventional capacitive method in which only the capacitance changes depending on external pressure, the current can be induced internally and the changed current can be detected.

In addition, the liquid crystal touch screen panel 100 of the present invention can improve characteristics such as TSP (Touch Screen Panel) by using a piezoelectric effect by an external physical force, which generates an electric field and uses the LCD ( This is different from the existing liquid crystal device, which improved the response speed of Liquid Crystal Display.

FIG. 10 illustrates an operation principle of a liquid crystal touch screen panel to which a banana-type liquid crystal or a liquid crystal polymer is applied according to an embodiment of the present invention.

As shown in FIG. 10, in the structure of a liquid crystal touch screen panel 100 including a liquid crystal or a liquid crystal polymer having a banana-type molecular structure A ′, for example, when pressure is applied to the first substrate 102 as an external stimulus The external stimulus applied to the first substrate 102 may be sensed based on the change in the amount of charge generated by the external stimulus applied to the first substrate 102. Here, an alignment film (not shown) is provided between the first substrate 102 and the liquid crystal layer 104 or between the second substrate 103 and the liquid crystal layer 104 for uniform alignment of the banana type liquid crystal and wedge type liquid crystal molecules of the present embodiment. May be arranged.

More specifically, in the case where the electrical alignment is formed due to the alignment of the molecules due to the alignment, when a pressure is applied to the first substrate 102, some of the liquid crystal molecules of the liquid crystal layer 104 disposed under the pressured region The reverse direction (C ') changes the direction of the spontaneous polarization (spontaneous polarization).

(

는 z축 단위 벡터임)만큼의 전하가 축적되어 있다가 외압에 의해 액정층(104)의 액정 분자 중 일부의 방향이 역전되면, 전하량이 두 배가 된다.Here, the spontaneous polarization P is a vector amount, and between the first electrode 105 and the second electrode 106 at both ends of the insulating layer (liquid crystal layer 104) before the external pressure is applied.

(

Is a z-axis unit vector), and when the direction of some of the liquid crystal molecules of the liquid crystal layer 104 is reversed by external pressure, the amount of charge is doubled.

)이 유도된다. 따라서, 제 1 전극(105)과 제 2 전극(106)간에 전위차가 변하게 되며, 해당 전압 변화를 감지함으로써 터치스크린 패널 상에 가해진 힘의 위치 정보를 파악할 수 있다.That is, when an external force is applied to a specific region and the alignment state of the liquid crystal molecules is reversed by 180 degrees (C '), and the spontaneous polarization direction is changed by 2P, the amount of charge corresponding to twice that region of the second electrode 106 is changed. (ΔC) (i.e.

) Is derived. Accordingly, the potential difference is changed between the first electrode 105 and the second electrode 106, and the position information of the force applied to the touch screen panel may be grasped by sensing the corresponding voltage change.

At this time, the dipoles of the liquid crystal of the banana-type molecular structure (A ') are rotated by more angles than the initial force as the magnitude of the externally applied force increases, and thus the macroscopic polarization change also increases, so that the gray level of the touch intensity can be detected. It becomes possible. The operating principle of the liquid crystal touch screen panel 100 according to the exemplary embodiment of FIG. 10 may be applied to the structure of the liquid crystal touch screen panel 100 of FIGS. 4 to 7 described above.

11 illustrates a liquid crystal of various types of polarization structures according to an embodiment of the present invention.

As shown in FIG. 11, the liquid crystals of the ferroelectric or antiferroelectric liquid crystal layer 104 may have inclined chiral phases in the same direction or opposite directions, or may have inclined racemate phases. Can be. For example, it is possible to have a liquid crystal of all Bn (n = 1, 2, 3, ...) which can be classified as SmC _x P _y (x = A or S, y = A or F). Here, B represents the phase of the liquid crystal having a banana-type molecular structure.

More specifically, FIG. 11A shows a semiferroelectric liquid crystal form SmC _A P _A having a racemic phase inclined in opposite directions, and FIG. 11B shows a mirror in the same direction. The ferroelectric liquid crystal form (SmC _S P _F ) with a photographic chiral phase is shown.

FIG. 11C shows a semiferroelectric liquid crystal form SmC _S P _A having a racemic phase inclined in the same direction, and FIG. 11D shows a chiral phase inclined in opposite directions. The ferroelectric liquid crystal form (SmC _A P _F ) having is shown.

On the other hand, in the above-described structure of the liquid crystal touch screen panel 100, a material capable of polarization may be made of a polymer film through a polymerization and synthesis process, thereby lowering the material cost.

Furthermore, FIG. 12 illustrates a configuration of a liquid crystal touch screen panel according to another embodiment of the present invention, and will be described in more detail with reference to FIGS. 13 to 16B.

As shown in FIG. 12, the LCD touch screen panel according to another exemplary embodiment of the present invention includes a first substrate 102 and a second substrate 103 disposed to face each other, and the substrate is made of glass or plastic material. Can be made.

The first electrode 105 and the second electrode 106 are disposed below the first substrate 102 and above the second substrate 103, respectively, and a transparent electrode or indium titanium oxide (ITO) may be used.

The alignment layer 109 is a structure for uniform alignment of the liquid crystal molecules forming the liquid crystal layer 104. The alignment layer 109 is disposed between the first electrode 102 and the liquid crystal layer 104 and the second electrode 106 and the liquid crystal layer 104. It can be arranged between the), a vertical alignment film or a horizontal alignment film can be used, in some cases rubbing (rubbing) can be applied.

The sealant 110 is a member for sealing the liquid crystal layer 104 and may be formed to surround the liquid crystal layer 104 between the alignment layers 109.

In this case, the liquid crystal molecules forming the liquid crystal layer 104 are preferably interfering with ferroelectric or antiferroelectric liquid crystal molecules that generate spontaneous polarization. The liquid crystals forming the liquid crystal layer 104 of FIG. 12 are ferroelectric liquid crystals and nematic liquid crystals, respectively. In the following case, the voltage change with respect to the external stimulus is described with reference to FIG.

In other words, in the experimental example of FIG. 13, the configuration of the liquid crystal touch screen panel was manufactured in the same manner, and the ferroelectric liquid crystal molecules and the nematic liquid crystal molecules were interposed with the liquid crystal molecules forming the liquid crystal layer different from each other. When external stimulation is applied by pressing a first substrate of both liquid crystal touch screen panels with a finger, as shown in FIG. 13, the nematic liquid crystal (a) hardly generates a voltage change. On the other hand, in the case of ferroelectric liquid crystals, the difference between (b) and (c) before and after external stimulus is applied is clear, and the voltage decreases when the liquid crystal touch screen panel is pressed and the voltage increases when the finger is released. Can be.

As such, when an external stimulus is applied to the liquid crystal touch screen panel according to another exemplary embodiment of the present invention, the volume of the liquid crystal molecules may change, and the change of the alignment state of the liquid crystal molecules generates a change in the charge amount, and thus, on the first substrate It can detect external stimuli applied to it.

Here, the characteristics of the ferroelectric liquid crystal and the anti-ferroelectric liquid crystal are compared in more detail with reference to FIGS. 14A to 15. 14A and 14B are graphs showing currents measured with respect to an applied voltage when the liquid crystals forming the liquid crystal layer of FIG. 12 are ferroelectric liquid crystals and antiferroelectric liquid crystals, respectively, and FIG. 15 is a liquid crystal forming the liquid crystal layer of FIG. 12. It is a figure for comparing and explaining the case of this ferroelectric liquid crystal and the case of an antiferroelectric liquid crystal.

FIG. 14A is a diagram illustrating a case where a triangular waveform is applied at a frequency of 0.1 Hz, such as ①, between a first electrode and a second electrode of a liquid crystal touch screen panel including a liquid crystal layer made of ferroelectric liquid crystal. . FIG. 14B is a diagram showing a case where the same voltage as 1 is applied between the first electrode and the second electrode of the liquid crystal touch screen panel including the liquid crystal layer made of antiferroelectric liquid crystal, and the change in current is measured as in ③.

14A and 14B, it can be seen that when the polarity of the voltage is changed, the spontaneous polarization direction is also changed to change the current value. In particular, in the case of the anti-ferroelectric liquid crystal, the current value changes more and more than before and after the polarity change of the voltage, as shown in (3) of FIG. 14B. Liquid crystals having such characteristics have a piezoelectric effect, and voltage is generated when a volume change of liquid crystal molecules occurs due to an external stimulus or pressure.

In addition, referring to FIG. 15, the ferroelectric liquid crystal and the antiferroelectric liquid crystal are classified according to whether the layers have the same liquid crystal tilt or periodically change in the non-electric state. The amount of voltage changed in accordance with the pressure applied to each liquid crystal can be measured as shown in FIG. 15.

In addition, FIGS. 16A and 16B are diagrams illustrating an amount of voltage change with respect to an external stimulus applied to the liquid crystal touch screen panel of FIG. 12.

The maximum voltage change that changes when the panel is pressed at a predetermined voltage can be measured, and the graph can be expressed as shown in FIG. 16A according to the applied pressure. Subsequently, as shown in FIG. 16B, it can be seen that the slope between the voltage change amount and the applied pressure appears to be constant, and from this result, it can be applied as an emotional touch sensor that compensates for the disadvantages of the conventional resistive film type and the capacitive type. Able to know.

17 is a flowchart illustrating a method of manufacturing a liquid crystal touch screen panel according to another embodiment of the present invention.

First, a transparent plastic substrate made of a material such as PC, PET, or PEN is prepared, and first and second electrodes ITO are deposited on each of the first and second substrates (S1710).

A pattern is formed on the deposited first and second electrodes by photolithography using an laser or a photoresist having a photosensitive property (S1720).

The horizontal alignment film and the vertical alignment film are respectively applied to the first and second substrates on which the first and second electrodes are formed by ink jet, spin coating, printing technique, or the like. After applying the alignment film, the solvent is removed by a bake process at a temperature of 100 to 250 ° C. for 10 to 60 minutes or by applying a SAM (self assembly material), for example, OTS or POSS, to remove the solvent ( S1730).

A sealant is applied to the outer periphery of the first and second substrates with a space in which the liquid crystal layer is interposed, and whether or not the spacer is applied may be determined according to the presence or absence of the column spacer (S1740).

Liquid crystal molecules, for example ferroelectric liquid crystal molecules or antiferroelectric liquid crystal molecules, are coated in the above-mentioned space by a technique such as inkjet, gravure printing, ODF, to form a liquid crystal layer, and a polymer or sealant that does not react with the liquid crystal layer is used. To seal (S1750).

By bonding the first substrate and the second substrate through the above process using an adhesive sheet such as a UV curable sheet that does not react with the liquid crystal layer (S1760), the first electrode and the first electrode disposed on the first and second substrates, respectively, The liquid crystal layer is interposed between the two electrodes.

A circuit configuration or module for driving the bonded liquid crystal touch screen panel may be arranged and installed to detect a voltage / current change occurring between the first substrate and the second substrate.

In the method for manufacturing a liquid crystal touch screen panel according to another embodiment of the present invention described above, by manufacturing a panel using an organic liquid crystal material, the method is based on a change in charge amount generated when an external stimulus is applied to the first substrate. The gray level of the external magnetic pole and the touch intensity applied to the substrate can be sensed, and the process material can be simplified and the cost can be reduced by filming the fabrication material.

In addition, the above description of the present invention is for illustrative purposes, and those skilled in the art to which the present invention pertains may understand that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. Could be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Claims (22)

In the liquid crystal touch screen panel, First substrate, A second substrate disposed opposite the first substrate, An electrode pattern portion disposed on the second substrate; It includes a liquid crystal layer made of liquid crystal molecules interposed between the electrode pattern portion and the first substrate, Detecting an external stimulus applied on the first substrate based on a change in the amount of charge generated by the external stimulus applied to the first substrate; LCD touch screen panel. The method of claim 1, The liquid crystal layer generates an elastic deformation by an external stimulus applied to the first substrate, and a liquid crystal touch that senses an external stimulus applied on the first substrate based on the capacitance of the electrode pattern portion that is changed by the elastic deformation. Screen panel. The method of claim 1, The electrode pattern portion includes a first electrode, a second electrode and an insulating layer disposed between the first electrode and the second electrode, the first electrode and the second electrode is a liquid crystal, characterized in that the cross-aligned form Touch screen panel. In the liquid crystal touch screen panel, First substrate, A second substrate disposed opposite the first substrate, A first electrode disposed under the first substrate, A second electrode disposed on the second substrate; It includes a liquid crystal layer made of liquid crystal molecules interposed between the first electrode and the second electrode, Detecting an external stimulus applied on the first substrate based on a change in the amount of charge generated by the external stimulus applied to the first substrate; LCD touch screen panel. The method of claim 4, wherein According to an external stimulus applied to the first substrate, the arrangement structure of the liquid crystal molecules of the liquid crystal layer is modified to generate a change in the spontaneous polarization direction, And an external stimulus applied on the first substrate based on a potential difference between the first electrode and the second electrode which changes according to the change in the spontaneous polarization direction. The method of claim 4, wherein And an arrangement structure of the liquid crystal molecules of the liquid crystal layer disposed under the region to which the external stimulus is applied is reversed. The method of claim 4, wherein And an insulating layer disposed between the first electrode and the liquid crystal layer and between the second electrode and the liquid crystal layer. The method of claim 4, wherein And an insulating layer and an auxiliary electrode disposed between the second substrate and the second electrode. The method of claim 4, wherein An alignment layer is disposed between the first substrate and the liquid crystal layer or between the second substrate and the liquid crystal layer. The method according to any one of claims 1 to 9, The liquid crystal layer includes a liquid crystal or a liquid crystal polymer having a banana-type molecular structure or a wedge-shaped molecular structure, wherein the liquid crystal polymer includes any one of a main chain type, a side chain type, a crosslinked type, and a dendrimer type liquid crystal polymer. LCD touch screen panel made. The method according to any one of claims 1 to 9, The liquid crystal of the liquid crystal layer A liquid crystal touch screen panel having an inclined chiral phase in the same direction or an opposite direction or having an inclined racemic phase. The method according to any one of claims 1 to 9, The liquid crystal layer is A liquid crystal touch screen panel having optical anisotropy birefringence. The method according to any one of claims 1 to 9, The liquid crystal layer is A liquid crystal touchscreen panel comprising a liquid crystal having a phase structure of at least one of nematec, smetic and cholesteric. The method of claim 4, wherein An alignment layer disposed between the first electrode and the liquid crystal layer and between the second electrode and the liquid crystal layer; And a sealant for sealing the liquid crystal layer. The method of claim 14, And the liquid crystal layer is formed of ferroelectric or antiferroelectric liquid crystal molecules. The method of claim 14, The charge amount change is a liquid crystal touch screen panel, characterized in that caused by the change in the volume of the liquid crystal molecules. In the method of manufacturing a liquid crystal touch screen panel, Depositing first and second electrodes on the first and second substrates, respectively, Etching to form patterns of the first and second electrodes, Applying an alignment layer to the first and second substrates on which the first and second electrodes are formed, respectively, Applying a liquid crystal layer to the first substrate, Forming an adhesive layer on the second substrate, and Bonding the first substrate and the second substrate to each other; The liquid crystal layer is a method of manufacturing a liquid crystal touch screen panel that generates a change in the spontaneous polarization direction as the arrangement structure of the liquid crystal molecules of the liquid crystal layer in response to an external stimulus applied to the first substrate. The method of claim 17 The liquid crystal layer includes a banana-type molecular structure, a wedge-shaped liquid crystal, a ferroelectric liquid crystal or an antiferroelectric liquid crystal polymer, wherein the liquid crystal polymer is any one of a main chain, branched, crosslinked and dendrimer type liquid crystal polymer. Method of manufacturing a liquid crystal touch screen panel comprising. The method of claim 17, The liquid crystal of the liquid crystal layer A method of manufacturing a liquid crystal touchscreen panel, having an inclined chiral phase in the same direction or an opposite direction or having an inclined racemic phase. The method of claim 17, The liquid crystal layer is A method for manufacturing a liquid crystal touch screen panel having optically anisotropic birefringence. The method of claim 17, The liquid crystal layer is A method for manufacturing a liquid crystal touch screen panel comprising a liquid crystal having a phase structure of at least one of nematec, smetic and cholesteric. The method of claim 17, And applying a sealant and a spacer to the first substrate after applying the alignment layer.

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