KR20140141447A - Display apparatus with touch input function and a method of controlling thereof - Google Patents

Abstract

The present invention relates to a display apparatus having a touch input function and a method for controlling the same. The display apparatus includes: first and second substrates spaced apart from each other; first and second electrodes formed on the first and second substrates, respectively; a display device layer interposed between the first and second electrodes and including a display device; and a driving unit to apply a display driving signal, which allows the display device layer to perform a display function, and a touch driving signal, which allows the display device layer to perform a touch sense function, to the first and second substrates.

Description

[0001] The present invention relates to a display apparatus having a touch input function and a control method thereof,

Disclosed is a display device having a touch input function and a method of controlling the same. The display device includes a plurality of first electrodes formed on first and second substrates spaced apart from each other, The thickness and the volume of the touch display device can be minimized because the display device can be used simultaneously as a touch sensor and thus it is unnecessary to provide a touch sensor separately from the display device. It is possible to apply a touch driving signal that combines the touch driving signal with the PDLC driving signal or applies only the row touch driving signal to eliminate the interference between the display driving signal and the touch driving signal and maintains the same potential difference as the PDLC driving signal A display device having a touch input function and a control method thereof A.

Specific examples of the flat panel display include a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), an electroluminescent display and a luminescence display device (ELD). These devices commonly use a flat panel display panel for realizing an image. The flat panel display panel has a pair of transparent insulation layers And has a structure in which substrates are bonded together.

Among them, the liquid crystal display device displays an image by adjusting the light transmittance of the liquid crystal using an electric field. To this end, the image display apparatus includes a display panel having a liquid crystal cell, a backlight unit for irradiating the display panel with light, and a drive circuit for driving the liquid crystal cell.

In recent years, there has been an increasing demand for a touch panel capable of recognizing a touch region through a human hand or a separate input means and delivering additional information in response to the touch region.

Accordingly, a method of manufacturing a display device having a touch function by attaching the touch panel to the outer surface of the display device has appeared, which is referred to as an on-cell method. According to the on-cell method, a display device having a touch function can be easily manufactured. However, since an adhesive layer between the touch panel and the display device is required and a process for forming the touch panel is required separately from the display device, . Further, the thickness of the entire display device is increased, resulting in an increase in the thickness and weight of the device to which the display device is attached.

In order to solve such a problem, a method of manufacturing a display device having a touch function by inserting a touch panel into a display device has been developed, and this method is an in-cell method. The in-cell method has the effect of reducing the thickness of the display as compared with the on-cell method, but it has a disadvantage in that it requires an additional step of depositing a thin film of indium oxide (ITO) film for the touch inside the display, There is a limitation in further reducing the thickness.

In addition, in order to recognize a touch position touched by a user, the conventional touch display panel patterns two electrode plates having mutually different polarities in an axial direction orthogonal to each other. If there is no need to recognize the touch position of the user (For example, when only touching is required), it is unnecessary to pattern the two electrode plates in the axial direction orthogonal to each other. However, since the two electrode plates must be patterned, unnecessary process steps occur .

In addition, the conventional touch display panel has a problem that the touch recognition rate is lowered when the upper plate of a thick glass material is attached to the upper surface of the touch panel by the user, and the conventional PDSC, SPD, Nanometer (μm) or the like) is required. Therefore, there is a problem that a gap may be limited to the liquid crystal cell.

In addition, since the conventional touch display panel does not apply the display driving signal and the touch driving signal at a time, it is troublesome to apply the driving signal in half in order to apply the respective driving signals.

Accordingly, the inventor of the present invention includes a display element layer provided between a first electrode and a second electrode formed on first and second substrates spaced apart from each other, so that the display device can be simultaneously used as a touch sensor It is possible to minimize the thickness and the volume of the touch display device because it is unnecessary to provide a touch sensor separately from the display device and it is possible to combine the row touch driving signal and the PDLC driving signal according to the initial capacitance value of the display element layer, A display device having a touch input function capable of applying a touch driving signal that applies only a row touch driving signal and eliminates interference between a display driving signal and a touch driving signal to maintain the same potential difference as a PDLC driving signal and a control method thereof It came to the following.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device having a plurality of first electrodes formed on first and second substrates spaced apart from each other, The thickness and the volume of the touch display device can be minimized because the display device can be simultaneously used as the touch sensor and thus it is unnecessary to provide the touch sensor separately from the display device. The PDLC driving signal may be combined with the PDLC driving signal, or only the row touch driving signal may be applied to remove the interference between the display driving signal and the touch driving signal to apply a touch driving signal that maintains the same potential difference as the PDLC driving signal To provide a display device having a touch input function and a control method thereof .

A display device having a touch input function according to an embodiment of the present invention includes a first substrate and a second substrate spaced apart from each other; A first electrode and a second electrode formed on the first substrate and the second substrate, respectively; A display element layer provided between the first electrode and the second electrode, the display element layer including a display element; And a driver for applying a display driving signal for causing the display element layer to perform a display function and a touch driving signal for allowing the display element layer to perform a touch sensing function on the first substrate and the second substrate .

In one embodiment, the driver may apply a low touch driving signal corresponding to a specific potential difference or less on the display driving signal to at least one of the first substrate and the second substrate.

In one embodiment, the driving unit applies the low touch driving signal to at least one of the first substrate and the second substrate when the initial capacitance value of the display element layer is less than or equal to a certain capacitance value And when the initial capacitance value of the display element layer is greater than or equal to a certain capacitance value, the display driving signal in which the row touch driving signal is synthesized may be applied to at least one of the first substrate and the second substrate.

In one embodiment, when the first substrate and the second substrate are touched in a state where the row touch driving signal is applied to at least one of the first substrate and the second substrate, The display driving signal in which the driving signal is synthesized can be applied to at least one of the first substrate and the second substrate.

In one embodiment, the driving unit may be configured such that when either one of the first substrate and the second substrate touches the touch panel in a state in which a display driving signal in which the row touch driving signal is synthesized is applied to at least one of the first substrate and the second substrate, The driving unit may apply the row touch driving signal to at least one of the first substrate and the second substrate.

In one embodiment, the row touch drive signal may correspond to more than a certain frequency value.

In one embodiment, the display element layer may include at least one of a suspended particle layer, a liquid crystal layer, and a polymer dispersed liquid crystal (PDLC) layer.

In one embodiment, the first electrode and the second electrode may be formed in a plate shape having a predetermined area.

In one embodiment, any one of the first electrode and the second electrode may be patterned in a specific direction, and the other may be formed in a plate shape having a predetermined area.

In one embodiment, the first electrode and the second electrode may be respectively patterned in an axial direction orthogonal to each other.

According to another aspect of the present invention, there is provided a method of controlling a display device having a touch input function, the method comprising: disposing a first substrate and a second substrate apart from each other; Forming a plurality of first electrodes and a plurality of second electrodes on the first substrate and the second substrate, respectively; A display element layer including a display element between the first electrode and the second electrode; And a display driving signal generating unit for generating a driving driving signal for causing the display element layer to perform a display function in a driving unit and a touch driving signal for causing the display element layer to perform a touch sensing function corresponding to a specific potential difference or less, 2 substrate to the substrate.

In one embodiment, the step of applying to at least one of the first and second substrates may further comprise the step of applying the low touch drive signal to the at least one of the first and second substrates when the initial capacitance value of the display element layer is less than or equal to a certain capacitance value. 1 substrate or a second substrate; And applying a display driving signal in which the row touch driving signal is synthesized to at least one of the first substrate and the second substrate when the initial capacitance value of the display element layer is greater than or equal to a certain capacitance value can do.

In one embodiment, the step of applying to at least one of the first substrate and the second substrate may be performed in a state where the row touch driving signal is applied to at least one of the first substrate and the second substrate, And applying a display driving signal in which the row touch driving signal is synthesized to one or more of the first substrate and the second substrate when any one of the two substrates is touched.

In one embodiment, the step of applying to at least one of the first substrate and the second substrate may include a step of applying a display driving signal in which the row touch driving signal is synthesized to at least one of the first substrate and the second substrate When the second substrate is touched, the driving unit applies the row touch driving signal to at least one of the first substrate and the second substrate.

In one embodiment, the forming of the first electrode and the second electrode may include forming the first electrode and the second electrode in a plate shape having a predetermined area.

In one embodiment, the step of forming the first electrode and the second electrode includes patterning one of the first electrode and the second electrode in a specific direction and forming the other in a plate shape having a predetermined area ; ≪ / RTI >

In one embodiment, the step of forming the first electrode and the second electrode may include patterning the first electrode and the second electrode in an axial direction orthogonal to each other.

And a display element layer provided between the first electrodes and the second electrodes formed on the first and second substrates spaced apart from each other, the display device can be simultaneously used as a touch sensor, It is possible to minimize the thickness and the volume of the touch display device and to arrange the touch driving signals different from each other according to the initial capacitance value of the display element layer in combination with the PDLC driving signal, It is possible to apply the touch driving signal which maintains the same potential difference as the PDLC driving signal.

In addition, the present invention has the effect of eliminating an unnecessary panel process by allowing different electrodes to be used according to the utilization of the touch function through the first electrode and the second electrode formed in various forms as well.

Further, since there is no need to separately provide a display device and a touch sensor, the present invention has no restriction on a cell gap, and thus it is possible to detect a capacitance change without changing a cell gap.

1 is an exploded perspective view schematically illustrating a display device 100 having a touch input function according to an embodiment of the present invention.
FIGS. 2 to 5 are views showing various forms of the first and second electrodes 112 and 122 shown in FIG.
6 is a cross-sectional view of a display device 100 having a touch input function according to an embodiment of the present invention.
7 and 8 are views for explaining a change in dielectric constant of the display element layer 130 of a display device 100 having a touch input function according to an embodiment of the present invention.
9 is a diagram illustrating a display driving signal and a touch driving signal that can be applied to a display device 100 having a touch input function according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited by the examples.

FIG. 1 is an exploded perspective view schematically illustrating a display device 100 having a touch input function according to an embodiment of the present invention. FIGS. 2 to 5 are views illustrating a first electrode and a second electrode 112 , And FIG. 6 is a cross-sectional view of a display device 100 having a touch input function according to an embodiment of the present invention.

1 to 6, a display device 100 having a touch input function includes a first substrate 111, a second substrate 121, a first electrode 112, a second electrode 122, An element layer 130 and a driving unit 140. [ The display device 100 having the touch input function shown in FIGS. 1 to 4 is according to one embodiment, and if necessary, some of the components shown in FIGS. 1 to 6 may be changed, added or deleted It is obvious to those skilled in the art.

First, the first substrate 111 and the second substrate 121 are spaced apart from each other with a predetermined gap therebetween. Here, as the first substrate 111, for example, a glass substrate may be used, but the substrate may not be limited thereto and various substrates may be used. As the second substrate 121, a transparent substrate may be used. For example, as the second substrate 121, a glass substrate or a plastic substrate can be used. However, the present invention is not limited thereto.

A first electrode 112 is formed on an upper surface of the first substrate 111 and a second electrode 122 is formed on a lower surface of the second substrate 121. The first electrode 112 may be formed of a conductive material, for example, a metal material or a transparent conductive material such as ITO (Indium Tin Oxide). The second electrode 122 may be made of a transparent conductive material.

2, the first electrode 112 and the second electrode 122 may have a plate shape (or a tubular electrode shape) having a predetermined area, When the first electrode 112 and the second electrode 122 are formed in the shape of a tubular electrode, the touch position to be touched by the user can not be recognized, and only the touch can be recognized.

Therefore, if the display device 100 having a touch input function according to an embodiment of the present invention is applied to a module that recognizes only the touch, the first electrode 112 and the second electrode 122 are connected to a predetermined Like shape having an area of 30 mu m.

3 and 4, any one of the first electrode 112 and the second electrode 122 according to an embodiment of the present invention may have a predetermined direction (for example, an X-axis direction, a Y-axis direction, or a random direction) (For example, blind patterning), and the other may be formed in a plate shape having a predetermined area as shown in Fig.

When one of the first electrode 112 and the second electrode 122 is patterned in a specific direction and the other is formed in a plate shape, only one electrode is patterned. Therefore, when the user touches the patterned position The touch position can be recognized. However, when touching the non-patterned position, the touch position can not be recognized.

Therefore, if the display device 100 having a touch input function according to an embodiment of the present invention is applied to a module for recognizing only a specific position, the first electrode 112 and the second electrode 122 ) May be applied to various types of electrodes to be patterned.

Referring to FIG. 5, the first electrode 112 and the second electrode 122 according to an embodiment of the present invention may be patterned (matrix patterned) in an axial direction orthogonal to each other.

For example, the first electrode 112 and the second electrode 122 may be patterned in a stripe pattern in the X-axis direction and the second electrode 122 may be patterned in a stripe pattern in the Y-axis direction have. Accordingly, the first electrode 112 and the second electrode 122 are patterned with axes orthogonal to each other, thereby allowing the user to precisely recognize the position touched by the user during the touch input.

Therefore, if the display device 100 having a touch input function according to an embodiment of the present invention is applied to a module for recognizing an accurate touch position, various types of characters, And can accurately recognize.

In one embodiment, the display device 100 having a touch input function according to an embodiment of the present invention may be a PM (passive matrix) driven display device. For example, a display device 100 having a touch input function according to an exemplary embodiment of the present invention includes a suspended particle device (SPD), a liquid crystal display (LCD) And a polymer dispersed liquid crystal (PDLC) display device. Here, the PDLC is an upper concept including a polymer network liquid crystal (PNLC) or a polymer stabilized liquid crystal (PSLC), and may include both liquid crystal and high-molecular display devices. It is obvious to a person skilled in the art that the above-mentioned display devices are according to one embodiment and that the present invention can be applied to any display device if the display device is changed in accordance with whether or not a drive signal is applied.

A display element layer 130 is provided between the first electrode 112 and the second electrode 122.

In one embodiment, the display element layer 130 may be one or more of a suspended particle layer, a liquid crystal layer, and a polymer dispersed liquid crystal (PDLC) layer. That is, when the display device 100 having a touch input function according to an embodiment of the present invention is an SPD, the display element layer 130 is a floating particle layer. In the case of an LCD, the display element layer 130 is a liquid crystal layer And in the case of a PDLC display device, the display device layer 130 becomes a PDLC layer.

Here, when the display element layer 130 is a PDLC layer, the display element layer 130 may include a polymer 131 and a liquid crystal 132. The display element layer 130 including the polymer 131 and the liquid crystal 132 may be formed through one or more curing processes such as a photopolymerization reaction in a state where the liquid crystal and the monomer are uniformly mixed.

The driving unit 140 may apply a display driving signal for causing the display element layer 130 to perform a display function on the first and second substrates 111 and 121 and a display element layer 130 to perform a touch sensing function And to control the display driving signal and the touch driving signal.

More specifically, the driving unit 140 synthesizes a low-level touch driving signal corresponding to a specific potential difference or less (for example, 2v or less) with the display driving signal to form a first substrate 111 and a second substrate 121 ), Which will be described in more detail with reference to FIG. 9 which will be described later.

The driving unit 140 may be a driving circuit for driving the display device 100 having a touch input function according to an embodiment of the present invention.

When the user touches either the first substrate 111 or the second substrate 121 in a state in which the touch driving signal is applied, the driver 140 changes the capacitance value of the display element layer 140 based on And it is possible to detect whether or not the user touches it.

Accordingly, a display device 100 having a touch input function according to an embodiment of the present invention includes a display element layer (not shown) corresponding to a dielectric material between the first electrode 112 and the second electrode 122 130), it has a structure similar to that of the electrostatic touch sensor. Accordingly, the display device 100 having a touch input function according to an embodiment of the present invention can perform a touch sensing function as well as a display function.

The display element of the display element layer 130 used in one embodiment of the present invention is a material having an anisotropy of dielectric constant unlike a general dielectric, and the arrangement state of display elements is changed depending on whether a voltage is applied to the upper and lower electrodes. . For example, if no voltage is applied to the upper and lower electrodes in the display element layer 130, the display elements may be arranged in parallel to the substrate, and if voltage is applied to the upper and lower electrodes, the display elements may be arranged perpendicular to the substrate. At this time, the dielectric constant in a state in which the display elements are arranged parallel to the substrate and the dielectric constant in a state in which the display elements are arranged perpendicular to the substrate are different from each other. Alternatively, as opposed to this case, if no voltage is applied to the upper and lower electrodes in the display element layer 130, the display elements can be arranged perpendicular to the substrate, and when voltage is applied to the upper and lower electrodes, the display elements are arranged parallel to the substrate . Alternatively, if no voltage is applied to the upper and lower electrodes, the display elements are arranged in a random pattern on the substrate, and if voltage is applied to the upper and lower electrodes, the display elements may be arranged perpendicularly or parallel to the substrate.

As described above, in the display element of the display element layer 130, the arrangement state of the display element changes depending on whether a voltage is applied or not, and the dielectric constant changes as the arrangement state changes.

Therefore, in order for the display element layer 130 to realize the touch sensing function, the initial capacitance value should be considered differently. This will be described with reference to FIGS. 7 and 8. FIG.

7 and 8 are views for explaining a change in dielectric constant of the display element layer 130 of a display device 100 having a touch input function according to an embodiment of the present invention.

7 and 8, the case where the display element layer 130 is a PDLC layer including the polymer 131 and the liquid crystal 132 will be described as an example. The PDLC layer including the polymer 131 and the liquid crystal 132 may be formed through one or more curing processes such as a photopolymerization reaction in a state where the liquid crystal and the monomer are uniformly mixed.

7 is a diagram illustrating a state in which a display driving signal is not applied to the first substrate 111 and the second substrate 121 in the display device 100 having a touch input function according to an embodiment of the present invention .

7, when no display driving signal is applied to the first substrate 111 and the second substrate 121, and no voltage is applied between the first electrode 121 and the second electrode 122 The liquid crystal molecules 132 are arranged in parallel with the first and second substrates 111 and 121 in the display element layer 130. [ In a state in which the liquid crystal molecules 132 are arranged in parallel, the lower light can not be transmitted to the upper side, so that the display function does not operate and the liquid crystal molecules are turned off. At this time, the dielectric constant of the display element layer 130 can be expressed by the following equation (1).

는 디스플레이 OFF 상태의 표시 소자층(130)의 유전율,

는 제1 및 제2 기판(111, 121)에 평행하게 배열된 상태의 액정(132)의 유전율,

는 폴리머(131)의 유전율이다.here,

The dielectric constant of the display element layer 130 in the display OFF state,

The dielectric constant of the liquid crystal 132 arranged in parallel to the first and second substrates 111 and 121,

Is the dielectric constant of the polymer (131).

Using this dielectric constant, the initial capacitance value in the OFF state of the display can be expressed by the following equation (2).

는 디스플레이 OFF 상태의 초기 캐패시턴스 값, A는 제1 및 제2 전극(112, 122)의 면적, t는 제1 및 제2 전극(112, 122) 간의 거리이다.here,

A is the area of the first and second electrodes 112 and 122, and t is the distance between the first and second electrodes 112 and 122.

는 구동부(140)에 의해 다음의 수학식 3과 같이 설정될 수 있다.Accordingly, in the display OFF state, the touch driving signal before being touched by the user, that is, the touch sensor capacitance,

Can be set by the driving unit 140 as shown in the following Equation (3).

는 구동부(140)에 의해 다음의 수학식 4와 같이 설정될 수 있다.Then, in the display OFF state, the touch drive signal after being touched by the user, that is, the touch sensor capacitance,

Can be set by the driving unit 140 as shown in Equation (4).

는 손으로 접촉하였을 때, 병렬로 형성되는 캐패시턴스이다.
here,

Are capacitances formed in parallel when they are in contact with each other by hand.

8 is a diagram illustrating a state in which a display driving signal is applied to a first substrate 111 and a second substrate 121 in a display device 100 having a touch input function according to an embodiment of the present invention.

8, when a display driving signal is applied to the first substrate 111 and the second substrate 121 and a voltage is applied between the first electrode 112 and the second electrode 122, The liquid crystal molecules 132 are arranged in the display element layer 130 perpendicularly to the first and second substrates 111 and 121. In a state where the liquid crystal molecules 132 are arranged vertically, the lower light can be transmitted to the upper side, so that the display function is activated and the liquid crystal molecules are turned ON. At this time, the dielectric constant of the display element layer 130 can be expressed by the following equation (5).

은 디스플레이 ON 상태의 표시 소자층(130)의 유전율,

는 제1 및 제2 기판(111, 121)에 수직하게 배열된 상태의 액정(132)의 유전율,

는 폴리머(131)의 유전율이다.here,

The dielectric constant of the display element layer 130 in the display ON state,

The dielectric constant of the liquid crystal 132 in a state of being vertically arranged on the first and second substrates 111 and 121,

Is the dielectric constant of the polymer (131).

Using this dielectric constant, the initial capacitance value of the display ON state can be expressed by the following Equation (6).

은 디스플레이 ON 상태의 초기 캐패시턴스 값, A는 제1 및 제2 전극(112, 122)의 면적, t는 제1 및 제2 전극(112, 122) 간의 거리이다.here,

A is the area of the first and second electrodes 112 and 122, and t is the distance between the first and second electrodes 112 and 122.

는 구동부(140)에 의해 다음의 수학식 7과 같이 설정될 수 있다.Accordingly, in the display ON state, the touch driving signal before being touched by the user, that is, the touch sensor capacitance,

Can be set by the driving unit 140 as shown in Equation (7).

은 구동부(140)에 의해 다음의 수학식 8과 같이 설정될 수 있다.In the display ON state, the touch drive signal after being touched by the user, that is, the touch sensor capacitance,

Can be set by the driving unit 140 as shown in Equation (8).

는 손으로 접촉하였을 때, 병렬로 형성되는 캐패시턴스이다.here,

Are capacitances formed in parallel when they are in contact with each other by hand.

7 and 8, the display element layer 130 of the display device 100 having a touch input function according to an embodiment of the present invention may have a different permittivity depending on whether a display driving signal is applied or not The driving unit 140 sets the initial capacitance value of the display element layer 130 differently according to whether the display driving signal is applied to the first substrate 111 and the second substrate 121, can do.

The change in capacitance described in Equations (1) to (8) is for the purpose of explaining conceptual contents. When the capacitance before and after applying the voltage to the upper and lower electrodes is measured, the capacitance derived from the equation . Accordingly, the driving unit 140 of the display device 100 having the touch input function according to the embodiment of the present invention can set the initial capacitance value using the capacitance values measured before and after the voltage is applied to the upper and lower electrodes .

Meanwhile, in order for the display device 100 having a touch input function according to an embodiment of the present invention to perform a touch input function, it should not affect the operation of the display device when the touch drive signal is applied. To this end, the driving unit 140 may control the display driving signal or the touch driving signal so as not to affect the driving of the display device when the touch driving signal is applied. 9, the need for the driver 140 to control a display driving signal or a touch driving signal in a display device 100 having a touch input function according to an embodiment of the present invention will be described.

9 is a diagram illustrating a display driving signal and a touch driving signal that can be applied to a display device 100 having a touch input function according to an embodiment of the present invention.

In Fig. 9, a 3x3 matrix display device is taken as an example. At this time, it is assumed that the driving frequency is 60 Hz and the driving voltage is 20V.

Although the touch driving signal is shown as a circular sine wave and the display driving signal is shown as a square wave in FIG. 9, it is not limited to a sinusoidal wave and a square wave, Note that the signal may correspond to a synthesized waveform.

9, a display device 100 having a touch input function according to an exemplary embodiment of the present invention includes touch driving signals synthesized with a display driving signal through a scan line 20 and a data line 30, . At this time, the touch driving signal has a sine wave form and the display driving signal has a square wave form and can have a value higher than a specific frequency.

When the scan line 20 is sequentially selected, the driving unit 140 causes the selected pixel to emit light instantaneously according to the signal of the data line 30 to perform a display function, and at the same time, To be performed.

At this time, since the driving unit 140 must send the display driving signal and the touch driving signal together, it is necessary to appropriately control the display driving signal or the touch driving signal.

Accordingly, when the initial capacitance value of the display element layer 130 is equal to or less than a specific capacitance value (in this case, light is not transmitted through the display element layer 130, A low touch driving signal is arranged in a period of (1/60) / 3 sec, and when a user touches any one of the first substrate 111 and the second substrate 121 Since the display state is changed from the off state to the on state, the display driving signal synthesized with the low touch driving signal is applied to at least one of the first substrate 111 and the second substrate 121 Thereby allowing the corresponding pixels of the display element layer 130 to emit light while simultaneously performing a touch function.

That is, at this time, since the initial capacitance value of the display element layer 130 corresponds to a specific capacitance value or less, the driver 140 recognizes that the display element layer 130 does not perform the display function from the beginning.

In contrast, when the initial capacitance value of the display element layer 130 corresponds to a specific capacitance value or more (in this case, light is transmitted through the display element layer 130 and the display element layer 130 performs a display function) ), The driving unit 140 combines the display driving signal and the row touch driving signal in a period of (1/60) / 3 sec to arrange the driving unit 140 in any one of the first substrate 111 and the second substrate 121 Touch operation signal is applied to at least one of the first substrate 111 and the second substrate 121 because the state of the display is changed from On to Off, So that the pixel of the display unit 130 can not emit light while simultaneously performing the touch function.

That is, at this time, since the initial capacitance value of the display element layer 130 corresponds to a specific capacitance value or more, the driver 140 recognizes that the display element layer 130 performs the display function from the beginning.

That is, a low-touch driving signal is synthesized with a display driving signal that is conducted to either the first electrode 112 or the second electrode 122, and the low-touch driving signal is synthesized with either the first electrode 112 or the second electrode 122 And the potential difference sensed by the pixel selected according to the signal of the data line 30 may vary from 2v to 20v.

Hereinafter, a method of controlling a display device having a touch input function according to an embodiment of the present invention will be described.

First and second substrates 111 and 121 are disposed apart from each other and a first electrode 112 and a second electrode 122 are formed on first and second substrates 111 and 121, ). At this time, the first electrode 112 and the second electrode 122 may be formed in a plate shape having a predetermined area, or one of the first electrode 112 and the second electrode 122 may be patterned in a specific direction, One may be formed in a plate shape having a predetermined area or may be patterned in an axial direction in which the first electrode 112 and the second electrode 122 are orthogonal to each other.

Next, a display element layer 130 including a display element is provided between the first electrode 112 and the second electrode 122.

Next, a display driving signal for causing the display element layer 130 to perform a display function on the first substrate 111 and the second substrate 121 in the driver 140, A signal can be applied.

At this time, the driving unit 140 synthesizes the low-touch driving signal with the display driving signal, which is conducted to either the first electrode 112 or the second electrode 122, and applies the low-touch driving signal to the first electrode 112 and the second electrode 122 122, the touch driving signal can be applied without signal interference with the display driving signal.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: a display device having a touch input function
111: first substrate
112: first electrode
121: second substrate
122: second electrode
130: display element layer
131: polymer
132: liquid crystal
140:

Claims (16)

A first substrate and a second substrate arranged to be spaced apart from each other;
A first electrode and a second electrode formed on the first substrate and the second substrate, respectively;
A display element layer provided between the first electrode and the second electrode, the display element layer including a display element; And
And a driver for applying a display driving signal for causing the display element layer to perform a display function and a touch driving signal for causing the display element layer to perform a touch sensing function on the first substrate and the second substrate,
Wherein the driving unit synthesizes a low touch driving signal corresponding to a specific potential difference or less on the display driving signal and applies the combination to at least one of the first substrate and the second substrate.
A display device having a touch input function.
The method according to claim 1,
The driving unit includes:
Applying a low touch driving signal to at least one of the first substrate and the second substrate when the initial capacitance value of the display element layer is less than or equal to a certain capacitance value,
Wherein a display driving signal in which the row touch driving signal is synthesized is applied to at least one of the first substrate and the second substrate when the initial capacitance value of the display element layer is greater than or equal to a certain capacitance value.
A display device having a touch input function.
3. The method of claim 2,
The driving unit includes:
When the first substrate or the second substrate is touched with the row touch driving signal being applied to at least one of the first substrate and the second substrate, Is applied to at least one of the first substrate and the second substrate.
A display device having a touch input function.
3. The method of claim 2,
The driving unit includes:
When any one of the first substrate and the second substrate is touched while a display driving signal obtained by combining the row touch driving signal is applied to at least one of the first substrate and the second substrate, Is applied to at least one of the first substrate and the second substrate.
A display device having a touch input function.
The method according to claim 1,
The low-
Characterized in that it corresponds to a specific frequency value or more,
A display device having a touch input function.
The method according to claim 1,
Wherein the display element layer
Characterized in that it comprises at least one of a suspended particle layer, a liquid crystal layer and a polymer dispersed liquid crystal (PDLC) layer.
A display device having a touch input function.
The method according to claim 1,
The first electrode and the second electrode are electrically connected to each other,
Wherein the substrate is formed in a plate shape having a predetermined area.
A display device having a touch input function.
The method according to claim 1,
Wherein one of the first electrode and the second electrode comprises a first electrode,
And the other one is formed in a plate shape having a predetermined area.
A display device having a touch input function.
The method according to claim 1,
The first electrode and the second electrode are electrically connected to each other,
Are patterned in an axial direction orthogonal to each other.
A display device having a touch input function.
Disposing the first substrate and the second substrate apart from each other;
Forming a plurality of first electrodes and a plurality of second electrodes on the first substrate and the second substrate, respectively;
A display element layer including a display element between the first electrode and the second electrode; And
A display driving signal for causing the display element layer to perform a display function in the driving unit is synthesized with a touch driving signal corresponding to a specific potential difference or less and for causing the display element layer to perform a touch sensing function, The method comprising the steps of:
A method of controlling a display device having a touch input function.
11. The method of claim 10,
Wherein the step of applying to at least one of the first and second substrates comprises:
Applying a low touch driving signal to at least one of the first substrate and the second substrate when the initial capacitance value of the display element layer is less than or equal to a certain capacitance value; And
And applying a display driving signal in which the row touch driving signal is synthesized to at least one of the first substrate and the second substrate when the initial capacitance value of the display element layer is greater than or equal to a certain capacitance value ≪ / RTI >
A method of controlling a display device having a touch input function.
11. The method of claim 10,
Wherein the step of applying to at least one of the first and second substrates comprises:
When the first substrate or the second substrate is touched with the row touch driving signal being applied to at least one of the first substrate and the second substrate, To the first substrate and the second substrate. The method of claim 1,
A method of controlling a display device having a touch input function.
11. The method of claim 10,
Wherein the step of applying to at least one of the first and second substrates comprises:
Wherein when the second substrate is touched in a state in which a display driving signal obtained by combining the row touch driving signal is applied to at least one of the first substrate and the second substrate, 2. A method as claimed in claim 1,
A method of controlling a display device having a touch input function.
11. The method of claim 10,
Wherein forming the first electrode and the second electrode comprises:
And forming the first electrode and the second electrode in the form of a plate having a predetermined area.
A method of controlling a display device having a touch input function.
11. The method of claim 10,
Wherein forming the first electrode and the second electrode comprises:
Patterning one of the first electrode and the second electrode in a specific direction and forming the other in a plate shape having a predetermined area.
A method of controlling a display device having a touch input function.
11. The method of claim 10,
Wherein forming the first electrode and the second electrode comprises:
And patterning the first electrode and the second electrode in an axial direction orthogonal to each other.
A method of controlling a display device having a touch input function.

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