KR20100008857A - Resistive touch panel of matrix structure having wave-shaped sensing channel and the device of touch screen thereof - Google Patents

Abstract

PURPOSE: A resistive touch panel of matrix structure having wave-shaped sensing channel and a device of touch screen thereof are provided to give a plurality of logic resolutions without the increase of the additional sensing channel. CONSTITUTION: A sensing channel(101) has a wave shape of width and constant cycle in the longitudinal direction. A sensing cell has a pinwheel shape in the cross-domain of the sensing channel. The sensing cell senses the physical coordinates value assigned to each sensing cell and more than two neighboring sensing cells. The sensing cell has coordinates through the median computation between the sensed cells in the logic operation.

Description

Resistive touch panel of matrix structure having wave shape sensing channel and touch screen terminal device using the same

The present invention relates to a resistive touch panel having a matrix structure having a wave shape sensing channel and a touch screen terminal device using the same. More specifically, each sensing channel has a wave shape having a predetermined period and a width in a longitudinal direction. To the resistive touch panel having a matrix-shaped resistive touch panel having a wave shape sensing channel to which a logical resolution is added to the resistive touch panel having a low physical resolution without increasing an additional sensing channel, and to a touch screen terminal device using the same. It is about.

As is well known, the touch panel refers to a device that reads the position voltage of a contacted point and detects it in two-dimensional coordinates by contacting a finger or a dedicated input tool (for example, a stylus pen) with the screen.

Such a touch panel includes a resistive film type, a capacitive type, an optical type, an ultrasonic type, and the like. In general, a resistive film type is most commonly used in a touch screen terminal device including a mobile phone and a PDA.

Resistive touch panels are roughly divided into analog and digital types.

1 illustrates a cross-sectional structure of an analog type resistive touch panel. Referring to FIG. 1, in the analog type resistive touch panel, the upper conductive sheet 3a and the lower conductive sheet 3b are disposed to face each other at regular intervals, and the upper conductive sheet 3a is disposed at the edges of the opposite surfaces. And an adhesive layer 5 for adhesive fixing between the lower conductive sheets 3b. On the upper surface of the lower conductive sheet 3b, dot spacers 7 for maintaining a distance from the upper conductive sheet 3a are evenly disposed.

When a voltage is applied on the analog type resistive touch panel and the upper conductive sheet 3a is pressed by the input tool 1, a contact point 9 is formed on the pressed predetermined area. The voltage corresponding to the contact point 9 can be read and converted into two-dimensional coordinates, that is, (x, y) coordinates, for detection.

On the other hand, the resistive touch panel of the digital type is another expression, the resistive touch panel of the matrix structure (hereinafter referred to as 'matrix touch panel') is different from the analog type resistive touch panel of the analog type by using a potential difference. Rather than calculating coordinates, the sensor detects the position through a sensor built into each corresponding position (called a 'sensing channel' according to its geometrical characteristics). It detects only the difference between the signal, Low: 0) or High: 1.

Through this, the resistive touch panel having a matrix structure can detect relatively stable position coordinates, and since there is no change in coordinates, there is no need for a separate candidate operation.

In the conventional matrix structure resistive touch panel, as shown in FIGS. 2A and 2B, each circuit has a linear or bar channel structure and acts as a sensing sensor. The corresponding channel of is called a sensing channel (10, Sensing Channel). FIG. 2A illustrates a sensing channel 10 in a horizontal direction (referred to as an 'x direction') and FIG. 2B illustrates a sensing channel 10 in a vertical direction (referred to as a 'y direction'). Each of the sensing channels 10 are disposed to be two-dimensionally perpendicular to each other by 90 °.

Each of the sensing channels 10 has lead wires 20 which are electrically connected to each other, and the lead wires 20 are easily connected to the terminals. Finished to form.

The sensing channels 10 illustrated in FIGS. 2A and 2B are overlapped in two dimensions, and a sensing area is formed at the overlapping portion. At this time, one sensing area is called a sensing cell. In addition, there is a constant gap between each sensing cell, through which each sensing cell maintains electrical isolation from each other.

As shown in (a) and (b) of FIG. 2, a resistive touch panel having a conventional matrix structure having a 10 × 10 sensing cell is provided by 10 sensing channels in a horizontal direction and 10 sensing channels in a vertical direction. As an example.

However, such a resistive touch panel having a matrix structure has a very simple and clear shape structure compared to other conventional touch panels, thereby ensuring reliable operating performance, but having a low physical resolution. .

Recently, in order to improve the physical resolution of the resistive touch panel having a matrix structure, a method of increasing the number of necessary sensing channels has been introduced. However, as the sensing channel increases, the occupied area of the circuit increases, and the additional configuration of the circuit is increased. As a result, various manufacturing costs have been increased.

Accordingly, there is an urgent need to develop a resistive touch panel having a high resolution and a matrix structure having the same sensing channel as the existing channel without additional installation of the sensing channel.

The present invention devised to solve the above problems relates to a resistive touch panel of a matrix structure having a wave-shaped sensing channel and a touch screen terminal device using the same, wherein each sensing channel is a wave having a predetermined period and width in the longitudinal direction. A resistive touch panel having a matrix structure having a wave shape sensing channel having a significantly improved resolution by providing a plurality of logical resolutions as well as physical resolution without increasing an additional sensing channel, and a touch screen terminal apparatus using the same Making it a technical challenge.

According to the spirit of the present invention for achieving the above technical problem, in the resistive touch panel of the matrix structure in which the sensing channel (Sensing Channel) is formed in the grid intersected area is formed in each sensing channel, The sensing channel is formed to have a wave shape having a predetermined period and a width in a longitudinal direction, and the sensing cell is formed to have a pinwheel shape in the crossing region of the sensing channels arranged in a lattice, wherein the sensing cell is formed for each sensing cell. When a specified physical coordinate value and two or more sensing cells adjacent to each other are sensed simultaneously, wave shape detection, characterized in that it has a plurality of logical coordinates logically obtainable through calculation of the intermediate value between the sensed cells simultaneously detected. A resistive touch panel having a matrix structure having channels can be provided.

In this case, it is preferable that the sensing channel has a zigzag shape or a W shape repeated continuously in the longitudinal direction.

In addition, the sensing channels may be disposed in a lattice opposite to each other by 90 ° or 270 °.

형상으로 형성될 수 있다. In this case, the sensing cell is located at the intersection of the sensing channels arranged in a grid

It may be formed in a shape.

In the meantime, the sensing channel may be sequentially scanned by a multiplexer to recognize a plurality of touch positions.

In addition, according to another aspect of the present invention, it is possible to provide a touch screen terminal device including a resistive touch panel having a matrix structure having such a wave-shaped sensing channel.

According to the present invention, by improving the structural shape of the sensing channel in the resistive touch panel having a low physical resolution in contrast to the highly reliable structure, the physical resolution as well as the logical resolution is provided, thereby providing high durability and electrical stability as well as excellent performance. By providing a resolution, there is a technical effect that contributes substantially to high resolution, slim design and high performance of the touch screen terminal device.

In addition, according to the present invention, sequential scanning and median interpolation are performed by using a multiplexer (MUX) for multiple contact position recognition, which is very difficult and complicated to implement on a conventional analog resistive touch panel. As a result, there is a technical effect of detecting a plurality of more accurate position data.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

1 is a conceptual diagram illustrating a conventional analog type resistive touch panel, and FIG. 2 is a view illustrating an example of a sensing channel in a resistive touch panel having a conventional matrix structure. FIG. 3 is a plan view diagram illustrating a wave shape sensing channel in an embodiment of a resistive touch panel having a matrix structure having a wave shape sensing channel according to the present invention, and FIG. 4. 3 is a whole image map comparing the sensing cells formed through the overlap of the sensing channels according to the embodiment shown in FIG. 3 and the sensing cells according to the conventional example shown in FIG. 2, and FIG. 5. 4 is an enlarged partial image map of the entire image map shown in FIG. 4, and FIG. 6 is a multi-contact location recognition method according to the embodiment shown in FIG. 3 and a multi-contact according to the conventional example shown in FIG. 2. It is a use conceptual view shown to explain the effect of the comparison value recognition method.

A preferred embodiment of a resistive touch panel having a matrix structure having a wave shape sensing channel according to the present invention will be described with reference to FIGS. 3 to 6 in parallel.

3 is a plan view illustrating a wave shape sensing channel in a preferred embodiment of a resistive touch panel having a matrix structure having a wave shape sensing channel, and FIG. 3 (a) is a horizontally arranged direction ('x'). Direction ”) and the sensing channel 101 of FIG. 3 (b) shows the sensing channel 101 in a vertically arranged direction (which is referred to as a“ y direction ”).

Each sensing channel 101 has a wave shape having a predetermined period and a width in each longitudinal direction. Preferably, as shown in FIGS. It may have a zigzag shape or a W shape.

The sensing channel 101 may be made of a transparent conductive material, and may include any one of indium tin oxide (ITO), conductive polymer (CNT), carbon nanotube (CNT), and the like. . In this embodiment, a film of ITO material, which is generally used most widely, is used.

The wave shape of the sensing channel 101 may be implemented through various etching processes. Both well-known wet etching methods and dry etching methods may be used, and in this embodiment, a photolithography process, which is one of wet etching methods, may be used. The ITO film is made into a wave shape.

Each sensing channel 101 is arranged to be electrically insulated, and each sensing channel 101 is provided with the same number of lead lines 105 for electrical connection. The lead wire 105 is made of a conductive material, which can be implemented by various well-known methods such as printing, plating, and metal thin film development.

Each lead wire 105 has a form of gathering at an end portion to facilitate connection to a connecting terminal, which is referred to as a terminal connecting portion 109. According to a preferred embodiment, the wire forming the lead wire 105 and the terminal connecting portion 109 is preferably made of a material having a relatively low electrical resistance compared to the sensing channel 101.

As described above, each of the sensing channels 101 in FIGS. 3A and 3B is disposed to be perpendicular to each other in a two-dimensional manner to face each other, so that each sensing channel 101 is overlapped. A sensing cell having a pinwheel shape may be formed at each site. Preferably, each sensing channel 101 is disposed at a lattice side facing 90 ° or 270 °.

4 is an overall image map showing a comparison between a sensing cell formed by overlapping sensing channels according to the present embodiment and a conventional sensing cell, and FIG. 4A illustrates a sensing channel according to the present embodiment. The sensing cell 150 formed by 101 is shown, and FIG. 4B illustrates a conventional sensing cell 50 formed by the conventional sensing channel 10.

와 같은 형상의 감지셀(150)이 형성된다. 여기서, 각각의

와 같은 형상의 감지셀(150)은 서로 일정한 간격만큼 이격 형성되며, 서로 전기적 절연을 유지한다.Each of the sensing channels 150 according to the present embodiment shown in FIG. 4A has a zigzag wave shape in the longitudinal direction, and each sensing channel 101 formed in the x direction or the y direction is two-dimensional. Vertically arranged so that each overlapped part

Sensing cell 150 of the same shape is formed. Where each

Sensing cells 150 of the same shape are formed spaced apart from each other by a predetermined interval, and maintain electrical insulation from each other.

와 같은 형상으로 되어 있으며, 본 실시예의 감지셀(150)과 동일한 개수, 즉 10x10개를 가진다. The conventional sensing cell 50 shown in Figure 4 (b) is

It has the same shape as, and has the same number, that is, 10x10 as the sensing cell 150 of the present embodiment.

5 (a) and 5 (b) respectively show the entirety of the sensing cell 150 of the present embodiment shown in FIG. 4 (a) and the conventional sensing cell 50 shown in FIG. 4 (b). It is a partial image map which partially enlarges and shows an image map.

Referring to FIGS. 5A and 5B, when the sensing cells 150 and the conventional sensing cells 50 of the present embodiment have the same number of sensing channels in the x direction and the y direction, each resolution is measured. Let's compare.

In FIGS. 5A and 5B, common sense channels in the adjacent x direction are referred to as C _n sense channels, C _{n + 1} sense channels, and C _{n + 2} sense channels, respectively, and adjacent y direction random channels. When the first sensing channel is an L _n sensing channel, an L _{n + 1} sensing channel, and an L _{n + 2} sensing channel, the resistive touch panel of the conventional matrix structure shown in FIG. 5B is C _{n + 1.} Only the physical coordinate values (C _{n +1} , L _{n +1} ) assigned to the sensing cell 50 can be recognized within the sensing cell 50 region formed by the overlap of the sensing channel and the L _{n + 1} sensing channel. There was a downside. As a result, it had no choice but to have a low physical resolution.

와 같은 바람개비 형상으로 존재한다. However, in the resistive touch panel of the matrix structure having the wave sensing channel according to the present embodiment illustrated in FIG. 5A, each sensing channel is formed to have the same period and width in a zigzag shape, thereby Sense cell

It exists in the shape of a pinwheel.

Due to this unique shape of the sensing cell, each sensing cell is logically calculated by calculating the middle point value between two sensing cells simultaneously when two or more sensing cells adjacent to each other are sensed simultaneously. Coordinates can be detected further, and such a technique can be used for interpolation, which is frequently used for image quality compensation in digital images.

Referring to (a) of FIG. 5, the resolution according to the present embodiment will be described in detail. When the area extended outward by an appropriate size centering on one sensing cell is referred to as the sensing cell sensing region unit 170, the sensing cell is sensed. The cell sensing area unit 170 can be divided into nine parts, which are one sensing cell 170a having a physical resolution, two sensing cells 170b or 170c at the same time, and sensing at a logical resolution. The cell can be divided into four simultaneous detection areas 170d.

First, one sensing cell sensing region 170a is present at the center of the sensing cell sensing region 170 and has a specified physical coordinate value (C _{n +1} , L _{n +1} ).

The detection cells 170b or 170c, where 170b or 170c is different only in the shape of the detection area but have the same logical coordinate acquisition method, are provided on the upper, lower, left, and right sides of the detection cell 1 detection area 170a. Logical coordinate values corresponding to each of the two adjacent sensing cells may be obtained by calculating an intermediate value of two adjacent sensing cells (for example, a sensing cell formed by overlapping a C _{n + 1} sensing channel and an L _n sensing channel). When the sensing cells formed by the overlap of the C _{n + 1} sensing channel and the L _{n + 1} sensing channel are sensed at the same time, the obtained logical coordinate values are (C _{n + 1} , [L _n , L _{n + 1} ] / 2)).

In addition, four sensing cell detection zones 170d are located at four corners of the sensing cell detection zone unit 170. Logical coordinate values corresponding to the four sensing cells can be obtained by calculating intermediate values of four adjacent sensing cells. (Eg, a sensing cell formed by overlapping a C _{n +1} sensing channel and an L _{n +1} sensing channel, a sensing cell formed by overlapping a C _{n +1} sensing channel and an L _{n +2} sensing channel, When both the sensing cell formed by the overlap of the C _{n + 2} sensing channel and the L _{n + 1} sensing channel and the sensing cell formed by the overlap of the C _{n + 2} sensing channel and the L _{n + 2} sensing channel are simultaneously sensed, The coordinate value is ([C _{n + 1} , C _{n + 2} ] / 2, [L _{n + 1} , L _{n + 2} ] / 2).

As described above, according to the preferred embodiment of the matrix type resistive touch panel having the wave-shaped sensing channel according to the present invention, it is possible to detect the specified physical coordinates for each sensing cell as well as the intermediate between adjacent sensing cells using the median interpolation technique. By calculating the value, eight additional logical coordinates can be additionally detected.

That is, the resistive touch panel of the matrix structure having the wave-shaped sensing channel according to the present embodiment illustrated in FIG. 5A is a resistive touch panel of the conventional matrix structure illustrated in FIG. 5B. 1 physical resolution specified for each sensing cell when the same number of sensing channels are used (i.e., if there is no increase in the occupied area of the circuit or no additional configuration of the circuit). In addition to being able to have an additional eight logical resolutions, this embodiment can have an excellent resolution without increasing the manufacturing cost compared to the prior art.

On the other hand, the resistive touch panel of the matrix structure having a wave shape detection channel according to the present invention can be usefully used in the multi-contact position recognition method.

Here, the multi-contact position recognition method is a touch panel input method that can simultaneously recognize a plurality of positions simultaneously sensed on one touch panel, which is very difficult and complicated to implement in a conventional analog resistive panel.

6 is a conceptual view illustrating a comparison of the effects of the multi-contact position recognition method according to the present embodiment and the multi-contact position recognition method according to the conventional example, and FIG. 6A illustrates the embodiment. FIG. 6B is a view illustrating a concept of using the multi-point point location recognition method according to the conventional example described with reference to FIG. 2.

6 (a) and 6 (b), in order to implement a multi-contact position recognition method, each terminal connection part may have a configuration in which a multiplexer (MUX) is connected. As a result, sequential scanning can be performed, and all coordinates simultaneously sensed on the touch panel can be output. Coordinates adjacent to each other among the plurality of coordinates simultaneously detected may be calculated and detected as the respective physical coordinate values or logical coordinate values corresponding to the corresponding positions by the intermediate value interpolation technique described above.

In FIG. 6A, when two sensing regions on the sensing channel according to the present embodiment, that is, the first sensing region 180a and the second sensing region 180b are simultaneously sensed, a median interpolation technique is used. The first sensing region 180a detects a median value of a total of six sensing cells including adjacent sensing cells (black and gray) as final logical coordinates, and the second sensing region 180b is adjacent sensing cells. The median of a total of 16 sensing cells covering (black and gray areas) is detected as the final logical coordinates.

In order to compare the resolution effect of FIG. 6A according to the present embodiment with the prior art, referring to FIG. 6B, two sensing regions on the sensing channel according to the conventional example, that is, the first conventional detection When the area 80a and the second conventional detection area 80b are simultaneously sensed (here, in order to more effectively compare the multi-contact position recognition method in this embodiment and the conventional example, the first conventional detection area 80a ) And the first sensing region 180a in FIG. 6A are the same position, and the second conventional sensing region 80b and the second sensing region 180b in FIG. 6A are the same position. The first conventional detection region 80a may detect the median value of a total of three detection cells including adjacent sensing cells (black areas) as final logical coordinates, and the second conventional detection region 80a may detect the second conventional detection region 80a. Area 80b is the final logical coordinates of the median value of a total of six sense cells including adjacent sense cells (black areas). It is possible to invoke.

That is, according to the multi-contact position recognition method of FIG. 6A according to the present embodiment, compared to FIG. 6B according to the conventional example, each corresponds to a different sensing area detected simultaneously. In calculating the final logical coordinates, it can be seen that a larger number of sensing cells are arithmetic by means of intermediate interpolation.

This suggests that the multi-contact position recognition method implemented in the resistive touch panel of the matrix structure having the wave sensing channel according to the present invention can be implemented much more accurately than in the related art. It is obvious that a touch screen terminal device including a resistive touch panel having a matrix structure, as well as a multi-touch screen terminal device, also belong to the scope of the present invention.

Although the present invention has been described with reference to the embodiments shown in the accompanying drawings, it is merely an example, and those skilled in the art will understand that various modifications or equivalent other embodiments are possible therefrom. will be.

Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a conceptual diagram illustrating a conventional analog type resistive touch panel.

FIG. 2 is a planar view illustrating an example of a sensing channel in a resistive touch panel having a conventional matrix structure.

3 is a plan view illustrating a wave shape sensing channel in an embodiment of a resistive touch panel having a matrix structure having a wave shape sensing channel according to the present invention.

FIG. 4 is an overall image map showing a comparison between a sensing cell formed through overlapping of sensing channels according to the embodiment shown in FIG. 3 and a sensing cell according to the conventional example shown in FIG. 2.

5 is an enlarged partial image map of the entire image map illustrated in FIG. 4.

6 is a conceptual view illustrating a comparison of the effects of the multi-contact position recognition method according to the embodiment shown in FIG. 3 and the multi-contact position recognition method according to the conventional example shown in FIG. 2.

Description of the main parts of the drawing

1: input tool 3a: top conductive sheet

3b: lower plate conductive sheet 5: adhesive portion

7: dot space 9: contact point

10: conventional sensing channel 50: conventional sensing cell

101: detection channel 105 of the present embodiment: lead line

109: terminal connection 150: sensing cell of this embodiment

170: detection cell detection area 170a: detection cell 1 detection area

170b, 170c: Detection area for two sensing cells at the same time 170d: Detection area for four sensing cells at the same time

Claims (6)

In the resistive touch panel having a matrix structure in which sensing channels are arranged in a lattice and sensing cells are formed in an area intersecting with each other, The sensing channel is formed to have a wave shape of a predetermined period and width in the longitudinal direction, the sensing cell is formed to have a pinwheel shape in the cross region of the sensing channel arranged in a grid, The sensing cell may be configured to obtain a plurality of logical coordinate values that are logically obtainable through calculation of an intermediate value between the sensing cells that are simultaneously sensed when two or more sensing cells adjacent to each other are simultaneously assigned to each sensing cell. Characterized by having, Matrix resistive touch panel with wave-shaped sensing channel. The method of claim 1, The sensing channel, Characterized in that it has a Zigzag shape or W shape repeated in the longitudinal direction, Matrix resistive touch panel with wave-shaped sensing channel. The method of claim 1, The sensing channel, Characterized in that the grid is disposed opposite to each other 90 ° or 270 °, Matrix resistive touch panel with wave-shaped sensing channel. The method of claim 1, The sensing cell, In the intersection area of the sensing channels arranged in a grid

It is formed in the shape, Matrix resistive touch panel with wave-shaped sensing channel. The method according to any one of claims 1 to 4, The sensing channel, Characterized in that the plurality of touch position can be recognized by sequentially scanning by a multiplexer (Multiplexer), Matrix resistive touch panel with wave-shaped sensing channel. A touch screen terminal device comprising a resistive touch panel having a matrix structure having a wave shape sensing channel according to any one of claims 1 to 5.

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