KR100698898B1 - Touch Panel - Google Patents

Abstract

The present invention relates to a resistive transparent analog touch panel that can reduce power consumption by increasing input position resolution and preventing current from flowing in an input holding state.

The resistive film-type transparent analog touch panel of the present invention has a plurality of light-transmitting Y-direction voltage applying electrodes 5 and coordinate detecting electrodes 7, which are formed in a slit shape with each other, and stripe-shaped resistors 3 and coordinate detection connected to the Y-direction voltage applying electrodes 5. A back substrate 1 made of a glass substrate having a common electrode 9 connected to an electrode 7, a stripe-shaped resistor 4 connected to an X-direction voltage applying electrode 6 and a coordinate detecting electrode 8 and an X-direction voltage applying electrode 6 formed in slits. The front substrate 2 made of PET film having the common electrode 10 connected to the coordinate detecting electrode 8 is disposed so that the Y-direction voltage applying electrode 5 and the coordinate detecting electrode 7 and the X-direction voltage applying electrode 6 and the coordinate detecting electrode 8 are perpendicular to each other. To place.

Resistive Film, Touch Panel, Transparent Analog

Description

Touch Panel {Touch Panel}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a plan view showing the configuration of Embodiment 1 of a resistive film-type transparent analog touch panel according to the present invention.

Fig. 2 is a cross-sectional view showing the structure of Example 1 of a resistive film-type transparent analog touch panel according to the present invention.

3 is a diagram showing the characteristics of the resistor of the resistive film type transparent analog touch panel according to the present invention.

4 is a plan view showing the configuration of Embodiment 2 of a resistive film-type transparent analog touch panel according to the present invention.

5 is a perspective view showing the structure of a conventional resistive transparent analog touch panel.

6 is a cross-sectional view showing the structure of a conventional resistive transparent analog touch panel.

7 is a plan view showing the structure of a conventional resistive transparent analog touch panel.

8 is a plan view showing the structure of a conventional resistive transparent analog touch panel.                 

<Description of the symbols for the main parts of the drawings>

1: back board 2: front board

3, 4: resistor 5: Y-direction voltage applied electrode

6: X direction voltage application electrode 7, 8: coordinate detection electrode

9, 10: common electrode 11: drive circuit

12: dot spacer 13: adhesive

14, 15: connection

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a resistive film type transparent analog touch panel mounted on a screen of a light receiving or light emitting display device such as a liquid crystal display device and a plasma display device and operated by a finger or a pen according to the contents of the display screen.

In the resistive touch panel, the front and back substrates on which the conductor film electrodes are formed are disposed to face each other while maintaining a very small gap. The front and back substrates are applied by applying pressure (input) to the surface of the board with a finger or a pen. The pressure position (input position) is detected by using a switch function that detects a signal by contacting the conductor film with respect to the pressure position of.

Resistive touch panels are largely divided into digital touch panels and analog touch panels. The digital touch panel forms a plurality of X-axis conductor film electrodes on the front substrate, a plurality of conductor film electrodes in the Y-axis direction on the rear substrate, and arranges the front substrate and the back substrate to face each other. The electrodes are arranged in a matrix so that the current flowing through the input is detected at the conductor film electrode to detect the current value or the voltage value to detect the input position.

With respect to the digital touch panel, it is necessary to increase the number of conductor film electrodes in order to increase the input position resolution. Increasing the number of electrodes leads to a narrow line width and line distance of the conductor film electrode, and it is difficult to form a fine pattern by a general screen printing method. There are many difficulties in manufacturing at low cost.

On the other hand, the analog touch panel, as shown in Fig. 5, has a conductive film electrode 16, 17 having a predetermined resistivity on each of the back substrate 1 and the front substrate 2, and a connection conductor 18 electrically connected to the conductor film electrodes 16, 17. 6 to 21, the rear substrate 1 and the front substrate 2 are disposed to face each other using the spacer 22 and the dot spacer 23, and the outside of the rear substrate 1 and the front substrate 2 is bonded 24 When the P (X, Y) point is pressed, the detection voltage is applied between the connecting conductors 20 and 21 of the front substrate 2 to detect the output partial pressure of the divided voltage output terminal 25 in the X direction. And the voltage is applied to the connecting conductors 18 and 19 of the rear substrate 1 to detect the output partial pressure of the voltage dividing output terminal 26 in the Y direction to detect the position of P (Y).

As for the analog touch panel, the fine pattern forming technique is not important, but the uniformity of the film surface resistance values of the conductor film electrodes 16 and 17 affects the input position resolution, and the higher the uniformity of the resistance value, the higher the resolution. . However, it is practically difficult to form a conductor film electrode having a uniform transition value on the entire surface of the film with the enlargement of the display screen.

In addition, since the detection voltage is applied and the current flows in the input standby state, power consumption increases.

7 is a rear substrate and a front substrate of an analog type touch panel for solving the problem of uniformity of the film surface resistance value described in Japanese Patent Laid-Open No. Hei 6-139005. As shown in FIG. 7, the back substrate 1 has a plurality of coordinate detection electrodes 5 connected vertically with respect to the outer resistor 3 and the outer resistor 3 having a uniform resistance value in a long direction on the outside of the input portion indicated by a dashed-dotted line. A plurality of coordinate detection electrodes 6 are formed on the front substrate 2 and have the same shape as the rear substrate 1, and have a plurality of coordinate detection electrodes 6 connected vertically with respect to the out-of-the-circuit resistor 4 and the out-of-the-wound resistor 4 having a uniform resistance value in a long direction on the outside of the input unit. The rear substrate 1 and the front substrate 2 are formed to face each other while maintaining a minute gap.

Since the out-of-circuit resistors 3 and 4 shown in FIG. 7 have a small area, it is possible to make the resistance value in the longitudinal direction a uniform substance, and to further increase the uniformity by trimming. However, in the analog type touch panel shown in Figs. 5 and 6, the detection voltage is applied from the driver circuit 11 to the outer resistor 3 or 4 even by the input holding state, so that the current flows in the outer resistor 3 or 4, thereby increasing the power consumption. .

8 shows the resistive pattern of the analog type touch panel disclosed in Japanese Patent Laid-Open No. 10-91350, and it has been shown to have an effect of reducing power consumption.

As shown in Fig. 8, the analog type touch panel is provided with a resistive pattern 27 and a pattern 28b formed on the electrode Y1 and a pattern 28a formed on the electrode X1 such that the pattern 27a and the electrode X2 are not connected to each other. Resistor pantones 28 arranged so that they do not connect to each other in a tooth shape are arranged at right angles to each other. The voltage for position detection applied from the drive circuit 11 between electrodes X1 and X2 or between electrodes Y1 and Y2 is equal to the current when the touch panel is pressed. As it starts to flow, power consumption in the input standby state is reduced.

However, in the analog type touch panel using the resistor patterns 27 and 28 shown in FIG. 8, the width, film thickness, and composition of the long direction of the patterns 27a, 27b, 28a, and 28b are made uniform, and the respective positions in the long direction are made. It is very difficult to make the resistance uniform, and the input position resolution is lowered due to its nonuniformity.

As described above, the analog type touch panel disclosed in Japanese Patent Application Laid-Open No. 6-139005 has a disadvantage in that power consumption increases due to a current applied to the resistor by applying a detection voltage in an input standby state.

In addition, the analog touch panel disclosed in Japanese Patent Application Laid-Open No. 10-91350 can reduce the power consumption in order to prevent the detection current from flowing in the input holding state, but the input position resolution decreases due to the nonuniform resistance value of the resistor pattern. There is a problem.

In order to solve the above problems, the present invention provides a resistive transparent analog touch panel that not only increases the input position resolution but also reduces power consumption by not flowing a current in the input holding state.

In the resistive transparent analog touch panel according to the first embodiment of the present invention, an optically transparent back substrate, an optically transparent front substrate, and an optically transparent front substrate, which face each other while maintaining a very small gap, are electrically connected to each other on an inner surface of the rear substrate. The plurality of light-transmissive first voltage applying electrodes and first coordinate detecting electrodes formed in a slit form so as not to be connected to each other, and the first voltage applying electrode and first coordinates on an inner surface of the front substrate opposite to the rear substrate. One of the plurality of light-transmitting second voltage applying electrodes, the second coordinate detecting electrode, and the plurality of first voltage applying electrodes orthogonal to the detection electrodes, which are formed in a slit so as not to be electrically connected to each other. Striped first resistor connected to one end, and stripped second resistor connected to one end thereof in a direction orthogonal to the plurality of second voltage applying electrodes. Sieve, a stripe-shaped first common electrode connected in a direction orthogonal to the plurality of first coordinate detection electrodes, and a stripe-shaped second terminal connected to one end thereof in a direction orthogonal to the plurality of second coordinate detection electrodes. It is equipped with a common electrode.

That is, in the resistive transparent analog touch panel (FIG. 1) according to the first embodiment of the present invention, the first resistor and the first common electrode are formed on the rear substrate, and the second resistor and the second common The electrode is formed on the front substrate.

The resistive transparent analog touch panel according to the second embodiment of the present invention (FIG. 4) is made of a material having a flexible front surface and a material having a rigid rear substrate, and includes a first resistor and a second resistor. And a first common electrode and a second common electrode are formed on the rear substrate, and a connection portion between the second resistor and the second voltage applying electrode and between the second common electrode and the second coordinate detection electrode It is characterized by having a connection part.

In any of the resistive transparent analog touch panels of the present invention, the first voltage applying electrode, the second voltage applying electrode, the first coordinate detecting electrode, the second coordinate detecting electrode, the first common electrode, The resistance value of the second common electrode is 50 Ω / □ or less, and the resistance values of the first resistor and the second resistor are 10 kΩ / □ or more and 300 kΩ / □ or less.

Hereinafter, an embodiment of the resistive film-type transparent analog touch panel according to the present invention has been described in the drawings.

Example 1.

1 is a plan view showing a configuration of Embodiment 1 of the present invention. 1 to 1 is a back substrate made of a light-transmissive material having a rigid, such as a transparent glass substrate of 0.7 to 1.8mm thickness, 2 is a transparent PET film of 0.1 to 0.2mm, a front substrate made of a light transmissive material having flexibility , 3 and 4 are resistors composed of a binder such as carbon powder and thermosetting polyester resin, and the first resistor 3 and the second resistor 4 are formed outside the input portion.

5 is a first voltage applying electrode (Y-direction voltage applying electrode) made of a light transmissive conductive material such as indium-tin oxide (ITO), and 6 is a second voltage applying electrode made of a light transmissive conductive material such as ITO ( X-direction voltage applied electrode), each of which has a plurality of slits, and one end of the Y-direction voltage applied electrode 5 is connected orthogonally to a stripe-shaped resistor 3 having a width of 3 to 5 mm, and one of the electrode applied to the X-direction voltage. The ends are connected orthogonal to the stripe resistor 4 having a width of 3 to 5 mm.

7, 8 are coordinate detection electrodes made of a light-transmitting conductive material such as ITO, and the first coordinate detection electrode 7 is formed in a slit without being connected orthogonally to the Y-direction voltage applying electrode 5 to detect the second coordinate. The electrode 8 is in the form of a slit so as not to be connected to the electrode 6 to which the X direction voltage is applied.

The line width of the Y-direction voltage applying electrode 5, the X-direction voltage applying electrode 6, and the coordinate detection electrodes 7, 8 is 0.3-3.0 mm, and the line spacing is 0.3-1.0 mm. The visibility is not unobtrusive to the naked eye. It is preferable from the standpoint of the present invention, and the material which can be applied may be a material having high electrical conductivity and permeability.

9 and 10 are common electrodes made of a transparent conductive material such as ITO, the first common electrode 9 is electrically connected to the first coordinate detection electrode 7, and the second common electrode 10 is the second coordinate detection electrode. It is electrically connected to 8.

11 is a drive circuit having a function of alternately applying a predetermined DC voltage to the resistors 3 and 4, detecting a current flowing along the input, and detecting an input position.

FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1 and shows a configuration in which a back substrate 1 and a front substrate 2 on which a resistor and each electrode are formed are assembled. In the figure, 12 is a spacer composed of a plastic insulating material such as an acrylic resin, and the like, and dot spacer 12 is disposed in the input unit shown in FIG. 1 and is disposed at an interval between the opposing rear substrate 1 and the front substrate 2. It has a gap of 10 to 20 mu m. 13 is an adhesive for bonding the back substrate 1 and the front substrate 2 to the outside thereof.

Here, the Y-direction voltage applying electrode 5, the X-direction voltage applying electrode 6, the coordinate detection electrodes 7, 8, the common electrodes 9, 10 are formed on the back substrate 1 and the front substrate 2, respectively, to form a film by vapor deposition of ITO. On the ITO film, a mask pattern having acid resistance and dissolving in alkali is formed by screen printing or photographic method, and after etching ITO exposed with a mixed solution of lactic acid-hydrochloric acid-ferric chloride, the mask pattern is caustic soda solution. It can be formed by peeling off.

As the constituent materials of the resistors 3 and 4, powders of RuO 2, Ag, Au, TaO, and ITO can be used in addition to the carbon powder. This powder and thermosetting polyester are mixed in a predetermined ratio to form a paste in a stripe shape having a predetermined width (usually 3 to 5 mm) by screen printing. The position to be formed is connected to one end of the Y-direction voltage applying electrode 5 and the X-direction voltage applying electrode 6 on the opposite side of the common electrodes 9 and 10. The resistance values of the resistors 3 and 4 can be adjusted by the mixing ratio of the above-mentioned powder and the thermosetting polyester.

The resistance values of the Y-direction voltage applying electrode 5, the X-direction voltage applying electrode 6, the coordinate detection electrodes 7, 8, and the common electrodes 9 and 10 are 50? /? Or less, preferably 20? /? , 4 shall be 10kΩ / □ or more and 300kΩ / □ or less. Therefore, the resistance values of the electrodes 5, 6, 7, 8, 9, and 10 are negligible with respect to the resistances of the resistors 3 and 4, and the improvement in position resolution shows the resistance values of the resistors 3 and 4 in which the pattern is formed. As shown in Fig. 3, it is possible to make it uniform at each position in the longitudinal direction so that the relationship between the length of the input portion and the resistance value has linearity (called resistance linearity).

In this embodiment, since the resistance linearity of the resistors 3 and 4 can be improved by laser trimming or the like, the position resolution can be improved.

Hereinafter, the operation of the resistive transparent analog type touch panel according to the present embodiment will be described with reference to FIG. 1. As the detection voltage, DC voltage 5V is alternately applied from the drive circuit 11 to one end of the resistor 3 and the resistor 4 (voltage input terminal). When the voltage is applied to the resistor 3 by pressing the point P of the front substrate with a finger, the Y-direction voltage applying electrode 5 and the coordinate detecting electrode 8 are electrically connected at the point P so that a current flows. After passing through the point, it flows from the P point of the Y-direction voltage applying electrode 5 to the second common electrode 10 through the P point of the second coordinate detection electrode 8. This current value is detected by the drive circuit, the resistance value from the voltage input terminal of the resistor 3 to the point 3P is obtained, and the Y coordinate of the point P pressed against the resistance value by A / D conversion is detected.

Next, when a voltage is applied to the resistor 4, the X-direction voltage applying electrode 6 and the coordinate detection electrode 7 are electrically connected at the point P, and a current flows, and the current passes through the 4P point of the resistor 4 to apply the voltage in the X direction. From the P point of the electrode 6, it passes through the P point of the 1st coordinate detection electrode 7, and flows to the 1st common electrode 9. As shown in FIG. By detecting this current value, the resistance value from the voltage input terminal of the resistor 4 to the point 4P can be obtained, and this resistance value can be A / D converted to detect the X coordinate of the pressed point.

In the present embodiment, since the resistors 3 and 4 can be trimmed, the resistors 3 and 4 with improved resistance linearity can obtain a high-resolution resistive transparent analog touch panel.

In addition, since the current starts to flow from the time when it is pressed, it is possible to reduce the power consumption in the input standby state.                     

Example 2.

4 is a plan view showing the configuration of Embodiment 2 of the present invention. In FIG. 4, the same reference numerals as used in FIG. 1 denote the same parts.

In Example 1, the resistor 4 and the common electrode 10 were formed on the front substrate 2, but in the second embodiment, the resistor 4 and the common electrode 10 were also formed on the back substrate 1 in addition to the resistor 3 and the common electrode 9, and the coordinate detection was performed on the front substrate 2. Only the electrode 8 and the X-direction voltage applying electrode 6 are formed. As the connecting portion 15 between the resistor 4, the X-direction voltage applying electrode 6, the connecting portion 14, and the common electrode 10 and the coordinate detecting electrode 8, a conductive paste composed of a mixture of silver powder and resin is used.

In this embodiment, since the resistors 3 and 4 common electrodes 9 and 10 are concentrated and designed on the back substrate 1 made of a glass substrate having better dimensional stability as compared to the PET film used for the front substrate 2, it is defective by heat treatment such as drying. It can suppress generation | occurrence | production, and can improve the yield of a product. In addition, since the relatively thick resistors 3 and 4 and the common electrodes 9 and 10 are designed on the back substrate 1 made of a highly rigid glass substrate, the front substrate 2 made of PET film is produced by reeling (hooping) during mass production. The efficiency can be improved.

In the resistive-type transparent analog type touch panel according to the first embodiment of the present invention, a light transmissive rear substrate, a light transmissive front substrate, and an inner surface facing the rear substrate are arranged electrically while maintaining a small gap therebetween. The first voltage applying electrode and the first coordinate detecting electrode, and the first voltage applying electrode and the first coordinate detecting electrode are formed on opposite inner surfaces of the plurality of light transmissive first voltage applying electrodes and first coordinate detecting electrodes formed alternately in a slit shape so as not to be connected. One end of the plurality of light-transmitting second voltage applying electrodes and the second coordinate detecting electrode formed in the slit so as not to be electrically connected to each other and to be electrically connected to the electrodes, orthogonal to the plurality of first voltage applying electrodes. A first stripe resistor connected to the stripe, a second stripe resistor connected to one end thereof in a direction orthogonal to the plurality of second voltage applying electrodes, and the plurality of first strips A stripe-shaped first common electrode connected to one end thereof in a direction orthogonal to the coordinate detection electrode, and a plurality of second common electrodes of stripe connected to one end thereof in the orthogonal direction with the plurality of second coordinate detection electrodes; In addition, the input position resolution can be increased, and power consumption can be reduced.

That is, in the resistive transparent analog touch panel (FIG. 1) according to the first embodiment of the present invention, the first resistor and the first common electrode are formed on the rear substrate, and the second resistor and the second common Since the electrodes are formed on the front substrate and can be connected to the resistor and the voltage applying electrode by screen printing, the common electrodes connected to the coordinate detection electrodes can be formed as one.

In the resistive transparent analog touch panel (FIG. 4) according to the second embodiment of the present invention, the front substrate is a flexible material, the back substrate is a rigid material, and the first resistor, the second resistor, Since the first common electrode and the second common electrode are formed on the rear substrate, defects caused by heat treatment processes such as drying can be suppressed to increase the yield of the product.

In addition, by designing a relatively thick resistor and a common electrode on the rear substrate using a resistant glass plate, the flexible front substrate can be reeled (hooped) during mass production and improve the production efficiency.                     

Any of the resistive transparent analog touch panel of the present invention is a first voltage applying electrode, a second voltage applying electrode, a first coordinate detection electrode, a second coordinate detection electrode, a first common electrode and a first electrode. The resistance value of the common electrode of 2 is 50 Ω / □ or less, and the resistance values of the first and second resistors are 10 kΩ / □ or more and 300 kΩ / □ or less. It can be done so as not to affect it.

Claims (4)

A plurality of light transmissive back substrates, a light transmissive front substrate, and a plurality of slits formed alternately so as not to be electrically connected to the inner surface opposite to the front substrate are disposed on the rear substrate, facing each other while maintaining a very small gap. The first voltage applying electrode and the first coordinate detection electrode of the light transmission, the first substrate is installed on the front substrate and opposite to the rear substrate, and perpendicular to the first voltage applying electrode and the first coordinate detection electrode A plurality of light-transmitting second voltage applying electrodes and second coordinate detecting electrodes formed on the slit so as not to be connected to the back substrate, and connected to one end thereof in a direction orthogonal to the plurality of first voltage applying electrodes A stripe-shaped first resistor and a front side substrate that are connected to one end thereof in a direction orthogonal to the plurality of second voltage applying electrodes. The first common electrode on the stripe is provided on the second resistor on the life, the rear substrate and connected to one end thereof in a direction orthogonal to the plurality of first coordinate detection electrodes, the plurality of first electrodes on the front substrate. A resistive film-type transparent analog touch panel having a stripe-shaped second common electrode connected to one end thereof in a direction orthogonal to a coordinate detection electrode of 2. A plurality of light transmissive back substrates and light transmissive front substrates, which are disposed to face each other while maintaining a very small gap, are installed on the rear substrate and alternately formed in a slit form so as not to be electrically connected to each other on an inner surface opposite to the front substrate. The first voltage applying electrode and the first coordinate detection electrode of the light transmission, the first substrate is installed on the front substrate and opposite to the rear substrate, and perpendicular to the first voltage applying electrode and the first coordinate detection electrode A plurality of light-transmitting second voltage applying electrodes and second coordinate detecting electrodes formed on the slit so as not to be connected to the back substrate, and connected to one end thereof in a direction orthogonal to the plurality of first voltage applying electrodes A first stripe shaped resistor, a second stripe shaped resistor formed on a rear substrate and formed in a direction perpendicular to the first resistor, A first common electrode in a stripe shape provided on the rear substrate and connected to one end thereof in a direction orthogonal to the plurality of first coordinate detection electrodes, in a direction perpendicular to the first common electrode and installed on the back substrate; A resistive film having a stripe-shaped second common electrode, and having a connection portion between a second resistor and a second voltage applying electrode and a connection portion between a second common electrode and a second coordinate detection electrode; Transparent analogue touch panel. The resistive film-type transparent analog touch panel according to claim 2, wherein the front substrate is a material having flexibility, and the back substrate is made of a material having rigidity. The method according to any one of claims 1 to 3, wherein the first voltage applying electrode, the second voltage applying electrode, the first coordinate detecting electrode, the second coordinate detecting electrode, the first common electrode and the second common The resistive film type transparent analog touch panel, wherein the resistance value of the electrode is 50 Ω / □ or less, and the resistance values of the first and second resistors are 10 kΩ / □ or more and 300 kΩ / □ or less.

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