KR20120004244A - Capacitive and resistive type planer member for touch panel and touch type liquid crystal display using the same - Google Patents

Abstract

PURPOSE: A capacitive and resistive type planer member for a touch panel and a touch type liquid crystal display using the same are provided to perform 3D detection and operate without respect to whether an input object is charged. CONSTITUTION: First conductive transparent patterns(230) are arranged on a first axis between a transparent substrate and a transparent insulating layer. First metal electrodes(225) are connected to the first conductive transparent patterns. A piezoelectric layer(240) is formed on the top and the bottom of the first conductive transparent patterns. The second conductive transparent patterns are arranged on a second axis facing the first conductive transparent patterns. Second metal electrodes are connected to the second conductive transparent patterns.

Description

CAPACITIVE AND RESISTIVE TYPE PLANER MEMBER FOR TOUCH PANEL AND TOUCH TYPE LIQUID CRYSTAL DISPLAY USING THE SAME}

The present invention relates to a planar member for a touch panel, and more particularly, a thin film electrostatic positive pressure that can be driven with or without charge of an input and can be sensed in three dimensions including a touch thickness as well as a two-dimensional touch position. It relates to a planar member for an anticorrosive touch panel.

In electronic devices such as personal digital assistants (PDAs), notebook computers, OA devices, medical devices or car navigation systems, touch panels for providing input means (pointing devices) to these displays together. This is widely used. Representative touch panels are known as capacitive types (also called capacitive coupling methods) in addition to resistive film type, electromagnetic induction type, and optical type.

1 is a cross-sectional view of a capacitive touch panel according to the prior art. Referring to FIG. 1, a conventional capacitive touch panel includes upper and lower layers 110 having conductive transparent patterns 120 connected to X and Y axes. In general, the conductive transparent patterns 120 connected to the X and Y axes include indium tin oxide (ITO), indium zinc oxide (IZO; indium zinc oxide), and indium tin-zinc-oxide ( It is formed by printing silver (Ag) on one of ITZO (Indium Tin Zinc Oxide).

Here, when the surface of the touch panel is touched with a charged finger or a pen (hereinafter referred to as a touch object), a parasitic capacitance change occurs between the surface and the X-axis and Y-axis conductive transparent patterns 120. The change in capacitance is sensed by a metal electrode (not shown) connected to the conductive transparent pattern 120 connected to the X-axis and the Y-axis, respectively, to identify the location of the touched portion.

However, since the capacitive touch panel according to the related art requires a change in capacitance in order to detect a position, the touch material should be a material that charges like a human body part, for example, a finger. Therefore, a touch with an object such as a pencil composed of a non-conducting non-charger is not detected. In addition, since only two-dimensional positions along the X and Y axes can be sensed, a change due to the touched intensity cannot be recognized, and thus there is a limit in recognizing the emotional touch. Furthermore, although not shown in the figure, the OCA layer is present between the upper and lower plates, which increases the thickness and impedes the improvement of the transmittance and visibility.

The present invention has been made to solve the above-described problem, the object of the present invention is to drive regardless of the presence or absence of the charge of the touch, can detect the intensity of the touch, the electrostatic constant pressure type touch panel of the thin film does not exist OCA It is to provide a molten cotton member.

In order to achieve the above object, a structure of a planar member for an electrostatic constant pressure type touch panel includes: a plurality of first conductive transparent patterns arranged in a first axis between a transparent substrate and a transparent insulating layer; A plurality of first metal electrodes connected to each of the plurality of first conductive transparent patterns; And a piezoelectric layer formed on or below the plurality of first conductive transparent patterns.

The planar member for the electrostatic constant pressure type touch panel may include a plurality of second members arranged in a second axis between the transparent substrate and the transparent insulating layer so as to face the plurality of first conductive transparent patterns. A second conductive transparent pattern of; And a plurality of second metal electrodes connected to each of the plurality of second conductive transparent patterns.

In particular, the planar member for the electrostatic constant pressure type touch panel may further include a transparent insulating layer formed between the transparent substrate and the plurality of second conductive transparent patterns.

The material of the piezoelectric body is preferably at least one of a perovskite structure, an ABO ₃ structure, a tungsten bronze steel dielectric, a bismuth layered ferroelectric material, a grain-oriented piezoelectric material, and an organic material piezoelectric material.

Meanwhile, the material of the first and second conductive transparent patterns may be indium tin oxide (ITO).

Further, the configuration of the touch type LCD according to another embodiment of the present invention includes an LCD panel (liquid crystal display panel) formed on one surface of the planar member for the electrostatic voltage type touch panel described above.

According to the present invention, driving is possible regardless of whether or not the input is charged, and the three-dimensional sensing including the touch thickness as well as the two-dimensional touch position is possible. In addition, by combining the OCA layer and the ITO layer in one member, the thickness can be reduced, and the transmittance and visibility can be increased as the OCA is removed. Moreover, the transmittance can be improved by inserting an insulating layer.

1 is a cross-sectional view of a capacitive touch panel according to the prior art.
2 is a perspective view showing the configuration of a planar member for an electrostatic constant pressure type touch panel according to an embodiment of the present invention.
3 is a top view showing a driving method of a planar member for an electrostatic constant pressure type touch panel according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a planar member for an electrostatic constant pressure type touch panel according to a preferred embodiment will be described in detail. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

In the description of the embodiments, "on" and "under" include both directly and "indirectly" formed through other components. The reference to the top or bottom of the clothes will be described with reference to the drawings.

In addition, the meaning of the 1st axis and the 2nd axis in this specification does not set an absolute direction, but means the direction which is relatively perpendicular to each other. (However, it will be apparent to those skilled in the art that the angle between the first axis and the second axis may be a non-vertical acute or obtuse angle.) For example, a conductive transparent pattern arranged in a second axis (hereinafter referred to as “second conductive transparent A structure having a conductive transparent pattern arranged in a first axis (hereinafter referred to as a “first conductive transparent pattern”) formed on the conductive transparent pattern arranged in the first axis when the viewing angle is different. It is the same as the structure in which the transparent pattern arranged biaxially was formed.

It is a perspective view which shows the structure of the planar member for electrostatic constant pressure type touch panels which concerns on one Embodiment of this invention. Referring to FIG. 2, the planar member for a capacitive touch panel according to an embodiment of the present invention may include an upper transparent insulating layer 210, metal electrodes 222 and 225, a first conductive transparent pattern 230, and a piezoelectric layer. 240, a second conductive transparent pattern 250, a lower transparent insulating layer 260, and a transparent substrate 270.

In more detail, the lower transparent insulating layer 260 on the transparent substrate 270, the plurality of second conductive transparent patterns 250, piezoelectric layer 240, and the horizontal axis, which are shown as arranged in the vertical axis, are illustrated. The plurality of first conductive transparent patterns 230, the metal electrodes 222 and 225, and the upper transparent insulating layer 210 are formed. The metal electrodes 222 and 225 may include a first metal electrode connected to each of the plurality of first conductive transparent patterns 230 and a second metal electrode connected to each of the plurality of second conductive transparent patterns 250. 222). In addition, the first conductive transparent pattern 230 and the second conductive transparent pattern 250 may be formed of indium tin oxide (ITO), indium zinc oxide (IZO; indium zinc oxide), indium tin- Indium Tin Zinc Oxide (ITZO). The piezoelectric layer 240 is formed between the first conductive transparent pattern 230 and the second conductive transparent pattern 250.

Meanwhile, the planar member for a capacitive touch panel according to the exemplary embodiment of the present invention may be composed of only one of the first conductive transparent pattern 230 and the second conductive transparent pattern 250. In this case, the piezoelectric layer 240 may be formed on or under the first conductive transparent pattern 230 or the second conductive transparent pattern 250.

Here, the piezoelectric layer 240 is a component for driving the touch panel regardless of the electric charge by using the piezoelectric effect. More specifically, the piezoelectric effect is a phenomenon in which positive and negative charges are proportional to external forces on both sides of a plate when pressure is applied to a certain type of crystal plate, and piezoelectrics are applied when external mechanical pressure is applied. A material in which polarization is induced inside a material or mechanical deformation is caused by an external electric field. Crystals used in electronic clocks are typical applications. At present, the most used material as a piezoelectric material is a PZT material, which has a perovskite crystal structure and a composition of Pb (Zr, Ti) O ₃ .

Such piezoelectric materials include, for example, SrTiO ₃ , KTaO ₃ , Pb (Zr, Ti) O ₃ , (Pb, La) TiO ₃ , BaTiO ₃ , KNbO ₃ , NaNbO ₃ , LiNBO ₃ , and (Bi _{1). / 2 Na 1/2) TiO} 3 _{system, (Bi 1/2 Na 1/2) 1} - xBaxTiO 3 [BNBT-100x] system, (1-x) (Bi 1/2 Na 1/2) TiO 3 - xNaNbO _{3 series, (Bi 1/2 Na 1/2) TiO} 3 - xNaNbO 3 _{series, (Bi 1/2 Na 1} /2) TiO 3 - KNbO 3 -1 - 1/2 (Bi 2 O 3, SC 2 O ₃ ) system, (Bi _0.5 Na _0.5 ) TiO ₃ -BaTiO ₃ -SrTiO ₃ system may be at least one. It may also be one or more of all perovskite structures, ABO ₃ structures, tungsten bronze steel dielectrics, bismuth layered ferroelectrics, grain-oriented piezoelectrics, and piezoelectric materials in organic form other than grain-oriented bismuth layered ferroelectrics.

When the touch material applies pressure to the piezoelectric layer 240, regardless of whether the touch water includes charge, a charge proportional to the strength of the pressure flows to detect the position and the strength. Therefore, the touch panel can be driven by sensing not only two-dimensionally along the first axis and the second axis but also on the third axis, that is, the Z-axis.

The lower transparent insulating layer 260 formed between the transparent substrate 270 and the plurality of second conductive transparent patterns 250 may be configured as a single layer or a multilayer in consideration of optical characteristics. In addition, the upper transparent insulating layer 210, the piezoelectric layer 240, and the lower transparent insulating layer 260 may be all of the organic or inorganic material.

3 is a top view showing a driving method of a planar member for an electrostatic constant pressure type touch panel according to an embodiment of the present invention. Referring to FIG. 3, a voltage of −2 / 3Vo having an amplitude of 2 / 3V over time is applied to each of the plurality of second conductive patterns 250 as illustrated, and each of the plurality of first conductive patterns 230 is applied. 1 / 3Vo with an amplitude of 2 / 3V is applied. In this way, when the external pressure is applied while the voltage over time is applied, an Ac voltage in proportion to the external pressure intensity is generated in the portion to which the pressure is applied. Therefore, a voltage difference occurs due to the polarization effect due to the piezoelectric effect in the portion to which the pressure is applied. The voltage difference may be amplified by a signal through an amplifier (not shown) to detect the position and the degree of pressure.

 In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical spirit of the present invention should not be limited to the above-described embodiments of the present invention, but should be determined by the claims and equivalents thereof.

110a: top plate 110b: bottom plate
120: conductive transparent pattern 130: metal electrode
140: parasitic capacitance 210: upper transparent insulating layer
222: second metal electrode 225: first metal electrode
230: first conductive transparent pattern 240: piezoelectric layer
250: second conductive transparent pattern 260: lower transparent insulating layer
270: transparent substrate

Claims (6)

Between the transparent substrate and the transparent insulating layer,
A plurality of first conductive transparent patterns arranged in a first axis;
A plurality of first metal electrodes connected to each of the plurality of first conductive transparent patterns; And
And a piezoelectric layer formed on or below the plurality of first conductive transparent patterns.
The method of claim 1,
The surface member for the electrostatic constant pressure type touch panel,
Between the transparent substrate and the transparent insulating layer,
A plurality of second conductive transparent patterns arranged in a second axis with the piezoelectric layer interposed therebetween so as to face the plurality of first conductive transparent patterns; And
And a plurality of second metal electrodes connected to each of the plurality of second conductive transparent patterns.
The method of claim 2,
The surface member for the electrostatic constant pressure type touch panel,
And a transparent insulating layer formed between the transparent substrate and the plurality of second conductive transparent patterns.
The method of claim 3, wherein
The material of the piezoelectric body is
A planar member for a capacitive static touch panel comprising at least one of a perovskite structure, an ABO ₃ structure, a tungsten bronze steel dielectric, a bismuth layered ferroelectric, a grain-oriented piezoelectric material, and a piezoelectric material in the form of an organic material.
The method of claim 4, wherein
The material of the first and second conductive transparent patterns is indium tin oxide (ITO).
A touch type LCD comprising an LCD panel (liquid crystal display panel) formed on one surface of the planar member for the electrostatic constant pressure type touch panel according to any one of claims 1 to 5.

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