KR20020032838A - Touch panel input device - Google Patents

Abstract

PURPOSE: A touch panel inputting device is provided to supply a conductive pattern structure or a transparent electrode film for making a voltage being applied on a conductive pattern be maintained uniformly. CONSTITUTION: A transparent film(101) has the first transparent electrode film(103). The first conductive patter(103c) is formed at one side of the first transparent electrode film(103) and has the first voltage lead-in unit(103a). The second conductive pattern(103d) is formed at the other side corresponded to the first conductive patter(103c) and has the second voltage lead-in unit(103b). A transparent substrate(102) has the second transparent electrode film(104) corresponded to the transparent electrode film(103). The third conductive patter(104c) is formed at one side of the second transparent electrode film(104) and has the third voltage lead-in unit(104a). The fourth conductive pattern(104d) is formed at the other side corresponded to the third conductive patter(104c) and has the fourth voltage lead-in unit(104b). A non-conductive isolator(105) is provided between the first conductive patter(103c), the second conductive pattern(103d) and the third conductive patter(104c), the fourth conductive pattern(104d). At least one out of electric resistivity applied to the first conductive patter(103c), the second conductive pattern(103d), the third conductive patter(104c), and the fourth conductive pattern(104d) is decreased for being separated from the first voltage lead-in unit(103a), the second voltage lead-in unit(103b), the third voltage lead-in unit(104a), and the fourth voltage lead-in unit(104b).

Description

Touch panel input device {TOUCH PANEL INPUT DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel provided on a display surface of a screen display device, and more particularly, to an analog resistive touch panel.

In general, the touch panel is installed on the display surface of an image display device such as a cathode ray tube (CRT), a liquid crystal display (LCD), a plasma display panel (PDP), an electroluminescence (EL), and the like. It is a computer peripheral device that inputs predetermined information into a computer by pressing an indium thin oxide (ITO) film.

Referring to the conventional touch panel input device 100 based on FIGS. 1 and 2, in the drawing, 101 is a thin transparent film that is a movable plate, 102 is a thick transparent substrate that is a substrate on a display device (not shown) side, or As transparent glass, they are laminated with a narrow gap by spacers 105, which are frame-shaped electrical non-conductors.

On the opposite surface of the transparent film 101 and the transparent substrate 102, a first transparent electrode film having a uniform thickness made of an indium tin oxide (ITO), tin oxide (SnO ₂ ), indium oxide (In ₂ O ₃ ) film, or the like First conductive pattern 103c, second conductive pattern 103d, and third conductive pattern 104c electrically connected to both sides of the 103 and second transparent electrode films 104 and the respective transparent electrode films 103 and 104, respectively. ) And the fourth conductive pattern 104d are printed, and a voltage is applied to the first conductive pattern 103c, the second conductive pattern 103d, the third conductive pattern 104c and the fourth conductive pattern 104d, respectively. The first voltage lead-in unit 103a, the second voltage lead-in unit 103b, the third voltage lead-in unit 104a and the fourth voltage lead-in unit 104b are respectively provided, and the transparent electrode films 103 and 104 are disposed at the contact positions. The contact position, that is, the pressure position of the transparent film 101, is detected by drawing out the voltage of the liver from the voltage inlets 103a, 103b, 104a, 104b.

The space between the transparent electrode films 103 and 104 is usually separated by a spacer 105 formed of an electrical non-conductor, but epoxy is formed on the transparent electrode film 104 so that the transparent electrode films 103 and 104 are not inadvertently contacted by light pressure. And dot spacers 106 made of an insulating synthetic resin such as acrylic resin are formed at appropriate intervals. By the dot spacer 106, the touched position is not detected as the pressure position even if the operation surface other than the pressure position is intentionally touched lightly.

The spacer 105 is formed by applying an adhesive 105b or an adhesive on the upper and lower surfaces of a frame-shaped thin plate 105a, and the transparent film 101 around the transparent electrode films 103 and 104 and transparent. The thin plate 105a is adhered or adhered to the substrate 102 to seal between the transparent electrode films 103 and 104 in the spacer 105.

In addition, the transparent film 101 can be reciprocated in the horizontal direction (direction indicated by the arrow in FIG. 2) by elasticity while being in close contact with the thin plate 105a by using an adhesive 105b or an adhesive, and the pressure position of the transparent film Similarly, the vicinity of the pressure position is bent in the direction of the transparent substrate 102 even in the vicinity of the spacer 101, in particular.

The detection of the pressure position by the analog type touch panel input device will be described with reference to FIG. 3 showing the pressure position detection circuit section 120. The touch panel input device is attached to a liquid crystal display screen (not shown) and detects the pressure position of the pressure operating surface P pressed by a pen, finger, or the like, and thus does not show instruction input data indicating instructions displayed below the pressure position. Output to personal computer.

Since the movable conductor layer 140 and the fixed conductor layer 150 are each formed of a uniform resistor, a coordinate detection voltage is applied to the voltage input portions 103a and 104a of the application side of the conductor layers 140 and 150. When the other ground side voltage lead-in portions 103b and 104b are grounded, a potential gradient of the same inclination is formed to generate a potential proportional to the distance from the lead portion at each position of the conductor layers 140 and 150. Although the same voltage is applied to the application side voltage inlets 103a and 104a, different voltages may be applied in some cases. In the case of the ground side voltage inlets 103b and 104b, the ground voltage inlets 103b and 104b are grounded to the same voltage, but may be connected to different voltages. The conductor layer 140 illustrated in FIG. 3 describes an equivalent circuit formed between the first conductive pattern 103c and the second conductive pattern 103d of the transparent electrode film 103 of FIG. 1, and the conductor layer 150 ) Shows an equivalent circuit formed between the third conductive pattern 104c and the fourth conductive pattern 104d of the transparent electrode film 104 in FIG.

In the case of detecting the pressure position, first, as the X coordinate detection mode, the X-side switches 114 and 115 are closed by the control of the CPU 113 to apply a potential gradient to the movable conductor layer 114, and the Y-side switch ( 116, 117 are opened. At this time, the switch 119 to be connected to the input terminal of the A / D converter 118 is connected to the Y ground side voltage lead-in part 104b side of the fixed conductor layer 150.

Here, when the P point (xp, yp) of the pressure operating surface is pressed by a stylus pen or the like, the movable conductor layer 140 is in contact with the fixed conductor layer 150.

As shown in the figure, the potential Vxp at the point P on the movable conductor layer 140 represents the resistance of the distance from the X application side voltage inlet 103a to the distance from the x2 and the X ground side voltage inlet 103b. If the resistance of x1 is x1, then Vcc * x1 / (x1 + x2) becomes, and the x coordinate xp is detected by reading this potential Vxp into the A / D converter 18.

Subsequently, the X side switches 114 and 115 are opened as the Y coordinate detection mode, the Y side switches 116 and 117 are closed, and the switch 119 connected to the input terminal of the A / D converter 118 is activated. The conductor layer 140 is connected to the X ground side voltage lead-in part 103b side.

The potential Vyp at the point P on the fixed conductor layer 150 is similar to the resistance of the distance from the Y-side voltage inlet 104a y2 and the resistance of the distance from the Y-ground side voltage inlet 8a y1. In this case, Vcc × y1 ÷ (y1 + y2) is obtained, and the y-coordinate yp is detected by reading this potential Vyp into the A / D converter 18. In this way, the X and Y coordinate detection modes are repeated to detect the pressure position by the pressure operation on the pressure operating surface in the X and Y directions.

However, in order to detect the X coordinate in the above manner, the same voltage must be applied to all parts of the conductive pattern 103c for applying the voltage to the conductor layer 140 to which the coordinate detection voltage is applied. That is, the potential of the portion "A" electrically connected to the voltage lead-in part 103a and the potential of the point "B" part spaced apart from the voltage lead-in part 103a should be the same, but the material forming the conductive pattern 103c. Although the low resistance conductor has a resistance, a voltage drop occurs, causing a problem in that the potential of the "A" portion becomes higher than the potential of the "B" portion. This problem also occurs in the case of the electrodes 103d, 104c and 104d. Although the voltage drop may be solved by software, a problem arises that the response time is long, and the linear distortion problem caused by the voltage drop becomes more serious as the size of the touch panel increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a touch touch panel input device having an improved conductive pattern structure or a shape of a transparent electrode film for maintaining a uniform voltage applied to a conductive pattern.

1 is a configuration of a conventional touch panel.

2 is a cross-sectional view of a conventional touch panel.

3 is a pressure position detection circuit of an analog type touch panel input device.

4 is a configuration diagram of a touch panel of one embodiment of the present invention;

5 is a configuration diagram of a touch panel of another embodiment of the present invention.

6 is a configuration diagram of a touch panel according to another embodiment of the present invention.

An object of the present invention is a transparent film formed with a first transparent electrode film, a first conductive pattern formed on one side of the first transparent electrode film and having a first voltage inlet, and the first conductive pattern of the first transparent electrode film A transparent substrate having a second conductive pattern formed on the other side facing the second side and having a second voltage entry portion, a second transparent electrode film facing the first transparent electrode film, and formed on one side of the second transparent electrode film; A third conductive pattern having a third voltage inlet, a fourth conductive pattern formed on the other side of the second transparent electrode film opposite to the third conductive pattern, and having a fourth voltage inlet; a first conductive pattern and the second conductive pattern; A touch panel input device having a conductive pattern and a non-conductive insulator provided between the third conductive pattern and the fourth conductive pattern, the first conductive pattern At least one of electrical resistivities of the second conductive pattern, the third conductive pattern, or the fourth conductive pattern may be formed from the first voltage lead, the second voltage lead, the third voltage lead, or the fourth voltage lead. Achievable by the touch panel input device, characterized in that it decreases with distance.

An object of the present invention is a transparent film formed with a first transparent electrode film, a first conductive pattern formed on one side of the first transparent electrode film having a first voltage inlet, and the first conductive pattern of the first transparent electrode film is opposed to A second conductive pattern formed on the other side and having a second voltage inlet, a transparent substrate having a second transparent electrode film facing the first transparent electrode film, and a third voltage inlet formed on one side of the second transparent electrode film. A fourth conductive pattern having a third conductive pattern, a fourth conductive pattern formed on the other side opposite to the third conductive pattern of the second transparent electrode film, and having a fourth voltage inlet; a first conductive pattern, the second conductive pattern, and the second conductive pattern; A touch panel input device having a non-conductive insulator provided between a third conductive pattern and a fourth conductive pattern, wherein the first conductive pattern, the second conductive pattern, and the third conductive pattern are provided. The touch panel, wherein the area of the at least one pattern of the sex pattern or the fourth conductive pattern increases as being spaced apart from the first voltage lead, the second voltage lead, the third voltage lead or the fourth voltage lead, respectively. It is also achievable by the input device.

The object of the present invention is a transparent film formed with a first transparent electrode film, a first conductive pattern formed in contact with one side of the first transparent electrode film having a first voltage inlet, and the first conductive pattern of the first transparent electrode film A second conductive pattern formed on the opposite side of the opposite side and having a second voltage entry portion, a transparent substrate on which a second transparent electrode film facing the first transparent electrode film is formed, and a contact side formed on one side of the second transparent electrode film; A third conductive pattern having a third voltage inlet, a fourth conductive pattern in contact with the other side of the second transparent electrode film opposite to the third conductive pattern, and having a fourth voltage inlet; a first conductive pattern and the second conductive pattern; A touch panel input device having a conductive pattern and a non-conductive insulator provided between the third conductive pattern and the fourth conductive pattern, the first conductive pattern And at least one of a contact area between the second conductive pattern and the first transparent electrode layer is increased as being spaced apart from the first voltage lead or the second voltage lead, respectively. At least one of the contact areas with the second transparent electrode film may be increased by being spaced apart from the first voltage lead or the second voltage lead, respectively.

Equipotential lines formed in the conductive pattern must be guaranteed linearity or linearity to form the same potential along the conductive pattern. The equipotential line formed by the conductive pattern is parallel to the conductive pattern due to the phenomenon that the linearity is distorted by the resistance present in the conductive pattern, that is, the potential near the voltage lead is higher than the potential at the position spaced apart from the voltage lead. The phenomenon, which does not occur, will occur. This occurs because the conductive pattern is not a perfect conductor, and the resistance present in the conductive pattern increases as the length increases and the area decreases, as shown in Equation (1).

R = ρ × L ÷ A

ρ: resistivity, L: length, A: area

Therefore, as a method of solving the problem of deterioration of linearity due to the voltage drop, there may be a method of using an electrode material having a low resistivity ρ or increasing an area as the voltage is applied away.

FIG. 4 is a configuration diagram of a touch panel having a conductive pattern of a material having a lower resistivity p as the distance from a voltage is applied as one embodiment of the present invention. 101 is a thin transparent film that is a movable plate, 102 is a thick transparent substrate or transparent glass that is a substrate on a display device (not shown), and these are stacked with a narrow gap by a spacer 105, which is a frame-shaped electrical nonconductor. It is.

On the opposite surface of the transparent film 101 and the transparent substrate 102, a first transparent electrode film having a uniform thickness made of an indium tin oxide (ITO), tin oxide (SnO ₂ ), indium oxide (In ₂ O ₃ ) film, or the like First conductive pattern 103c, second conductive pattern 103d, and third conductive pattern 104c electrically connected to both sides of the 103 and second transparent electrode films 104 and the respective transparent electrode films 103 and 104, respectively. ) And the fourth conductive pattern 104d are printed, and a voltage is applied to the first conductive pattern 103c, the second conductive pattern 103d, the third conductive pattern 104c and the fourth conductive pattern 104d, respectively. The first voltage lead-in unit 103a, the second voltage lead-in unit 103b, the third voltage lead-in unit 104a and the fourth voltage lead-in unit 104b are respectively provided, and the transparent electrode films 103 and 104 are disposed at the contact positions. The contact position, that is, the pressure position of the transparent film 101, is detected by drawing out the voltage of the liver from the voltage inlets 103a, 103b, 104a, 104b.

The space between the transparent electrode films 103 and 104 is usually separated by a spacer 105 formed of an electrical non-conductor, but epoxy is formed on the transparent electrode film 104 so that the transparent electrode films 103 and 104 are not inadvertently contacted by light pressure. And dot spacers 106 made of an insulating synthetic resin such as acrylic resin are formed at appropriate intervals. By the dot spacer 106, the touched position is not detected as the pressure position even if the operation surface other than the pressure position is intentionally touched lightly.

The spacer 105 is formed by applying an adhesive 105b or an adhesive on the upper and lower surfaces of a frame-shaped thin plate 105a, and the transparent film 101 around the transparent electrode films 103 and 104 and transparent. The thin plate 105a is adhered or adhered to the substrate 102 to seal between the transparent electrode films 103 and 104 in the spacer 105.

In addition, the transparent film 101 can be reciprocated in the horizontal direction (direction indicated by the arrow in FIG. 2) by elasticity while being in close contact with the thin plate 105a by using an adhesive 105b or an adhesive, and the pressure position of the transparent film Similarly, the vicinity of the pressure position is bent in the direction of the transparent substrate 102 even in the vicinity of the spacer 101, in particular.

The conductive patterns 103c, 103d, 104c, and 104d used for the touch panel are generally formed of silver (Ag) paste having low resistivity. In this case, the problem caused by the voltage drop can be solved to some extent by bringing the resistivity of the silver paste to be applied differently. That is, when the conductive pattern 103c is described as an example, the resistivity of the conductive pattern 103c is formed to be lower as it is spaced apart from the vicinity of the first voltage lead-in portion 103a so that the potential formed in the conductive pattern 103c can be maintained uniformly. In this case, when the resistivity of the conductive pattern 103c around the first voltage inlet 103a is defined as ρA, and the resistivity of the conductive pattern 103c at the position spaced apart from the first voltage inlet 103a is defined as ρB, The conductive pattern is formed to have a small resistivity of ρB. In the same way, in the case of the conductive patterns 103d, 104c, and 104d, the resistivity ρA of the portion where the voltage is applied is made larger than the resistivity ρB of the position spaced by the application portion, so that the potential formed in the conductive pattern is formed with an equipotential, so that more accurate X , The Y coordinate can be detected.

FIG. 5 is a configuration diagram of a touch panel formed of conductive patterns 103c, 103d, 104c, and 104d having a large area as a distance from a voltage is applied as one embodiment of the present invention. The same reference numerals as in FIG. 4 are used to describe the same components as those described in FIG. 4. As shown in FIG. 5, the area of the silver paste to be applied is gradually widened as the area of the silver paste is spaced from the voltage inlet, thereby solving the problem of linearity distortion due to voltage drop to some extent. In other words, the conductive pattern 103c will be described as an example, so that the area of the conductive pattern 103c is gradually widened as the area of the conductive pattern 103c is separated from the first voltage lead-in portion. That is, when the area of the conductive pattern 103c in the vicinity of the first voltage inlet is defined as aA and the area of the conductive pattern 103c in the position spaced apart from the first voltage inlet is defined as aB, the area aB is the area aA. By forming the conductive pattern to have a larger value, the entire region of the conductive pattern 103c has the same potential. In the same manner, the areas of the conductive patterns 103d, 104c, and 104d are also wider as they are spaced apart from the second, third, and fourth voltage inlets, respectively, so that the potential formed in the conductive pattern 103c is equipotential. More accurate X and Y coordinates can be detected.

FIG. 6 is a configuration of a touch panel in which a contact area between the transparent electrode films 103 and 104 and the conductive patterns 103c, 103d, 104c, and 104d is formed to be wider as a distance from a voltage is applied. It is also. The same reference numerals as in FIG. 4 are used to describe the same components as those described in FIG. 4. As shown in FIG. 6, the contact area between the transparent electrode film and the conductive pattern to be coated is formed to be wider as the contact area is separated from the voltage inlet, thereby solving the problem of linear distortion caused by the voltage drop to some extent. Fig. 6B shows the case of the contact area between the 103 transparent electrode film and the 103c and 103d conductive patterns. Contact surfaces of the first transparent electrode film 103 and the conductive patterns 103c and 103d are indicated by hatched lines. It can be seen that the hatched area becomes wider as it is spaced apart from the first voltage lead-in part 103a. That is, the contact area between the first transparent electrode film 103 and the first conductive pattern 103c at a point adjacent to the first voltage lead-in part 103a is defined as cA and is spaced apart from the first voltage lead-in part 103a. When the contact area between the first transparent electrode film 103 and the conductive pattern 103c is defined as cB, the contact area cB is made wider than cA to solve the problem of linear distortion caused by voltage drop. 6B and 6C in the same manner, the first transparent electrode film 103 and the second conductive pattern 103d, the second transparent electrode film 104 and the third conductive pattern 104c, and the second The contact area between the transparent electrode film 104 and the fourth conductive pattern 104d is kept wider as it is spaced apart from the second voltage lead-in part 103b, the third voltage lead-in part 104c, and the fourth voltage lead-in part 104d, respectively. By doing so, the same potential can be maintained in each conductive pattern.

According to the touch panel input device of the present invention, it is possible to solve the linear distortion problem caused by the voltage drop generated as the voltage applied to the electrode moves away from the application point, thereby improving the response speed of the touch panel. It became.

Claims (5)

A transparent film having a first transparent electrode film formed thereon, a first conductive pattern formed on one side of the first transparent electrode film and having a first voltage inflow portion, and the other side facing the first conductive pattern of the first transparent electrode film; A second conductive pattern formed and having a second voltage entry; A transparent substrate having a second transparent electrode film facing the first transparent electrode film, a third conductive pattern formed at one side of the second transparent electrode film and having a third voltage inlet, and the second transparent electrode film; A fourth conductive pattern formed on the other side opposite to the third conductive pattern and having a fourth voltage entry portion; In the touch panel input device having a non-conductive insulator provided between the first conductive pattern and the second conductive pattern and the third conductive pattern and the fourth conductive pattern, At least one of electrical resistivities provided in the first conductive pattern, the second conductive pattern, the third conductive pattern, or the fourth conductive pattern is respectively the first voltage lead, the second voltage lead, the third voltage lead or the third voltage lead. 4. The touch panel input device of claim 4, wherein the touch panel input device decreases as it is spaced apart from the voltage input unit. A transparent film having a first transparent electrode film formed thereon, a first conductive pattern formed on one side of the first transparent electrode film and having a first voltage inflow portion, and the other side facing the first conductive pattern of the first transparent electrode film; A second conductive pattern formed and having a second voltage entry; A transparent substrate having a second transparent electrode film facing the first transparent electrode film, a third conductive pattern formed at one side of the second transparent electrode film and having a third voltage inlet, and the second transparent electrode film; A fourth conductive pattern formed on the other side opposite to the third conductive pattern and having a fourth voltage entry portion; In the touch panel input device having a non-conductive insulator provided between the first conductive pattern and the second conductive pattern and the third conductive pattern and the fourth conductive pattern, An area of at least one of the first conductive pattern, the second conductive pattern, the third conductive pattern, or the fourth conductive pattern is respectively the first voltage lead, the second voltage lead, the third voltage lead or the fourth. The touch panel input device of claim 1, wherein the touch panel input device increases as the distance from the voltage inlet increases. A transparent film having a first transparent electrode film formed thereon, a first conductive pattern formed in contact with one side of the first transparent electrode film and having a first voltage inflow portion, and the other side facing the first conductive pattern of the first transparent electrode film; A second conductive pattern formed in contact with and having a second voltage entry; A third conductive pattern having a second transparent electrode film facing the first transparent electrode film, a third conductive pattern formed in contact with one side of the second transparent electrode film, and having a third voltage inlet; A fourth conductive pattern in contact with the other side opposite to the third conductive pattern and having a fourth voltage inlet; In the touch panel input device having a non-conductive insulator provided between the first conductive pattern and the second conductive pattern and the third conductive pattern and the fourth conductive pattern, At least one of the contact area between the first conductive pattern and the second conductive pattern and the first transparent electrode layer is increased as the distance from the first voltage lead or the second voltage lead is respectively increased, or the third conductive pattern and the third conductive pattern 4. The touch panel input device of claim 4, wherein at least one of a contact area between the conductive pattern and the second transparent electrode layer is increased as being spaced apart from the first voltage lead or the second voltage lead. The method of claim 3, wherein Touch panel input, characterized in that at least any one of the contact area between the third conductive pattern and the fourth conductive pattern and the second transparent electrode film is increased as being spaced apart from the third voltage lead or the fourth voltage lead. Device. The method according to any one of claims 1 to 3, The touch panel input device, characterized in that the conductive pattern is provided with silver (Ag).