TWI246025B - Voltage-compensated resistive touch panel - Google Patents

Abstract

The present invention provides a voltage-compensated resistive touch panel. The panel includes: a rectangle substrate; a uniform resistive surface uniformly coating on the rectangle substrate; a plurality of resistance elements forming on the perimeter edges of the uniform resistive surface so as to create orthogonal electrical fields therein while a DC power is applied; a plurality of compensating elements spacing along the perimeter edges of the uniform resistive surface, wherein the sizes of them and the intervals between each others are respectively proportional and inversely proportional to the distances apart from the edges of the uniform resistive surface, so as to compensate the bow equipotential lines generated by the abovementioned orthogonal electrical fields; a touch film uniformly coating conductive material on the surface facing the uniform resistive surface; and a plurality of insulators uniformly spreading between the uniform resistive surface and the touch film.

Description

1246025 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a touch panel 'especially to a resistive touch panel with voltage compensation ° [Previous technology] When flat displays gradually replaced the traditional At the same time as the display, the touch panel is also widely used in display systems in various fields due to its convenient input characteristics and the improvement of process technology, such as: PDA, tablet pc (·

Tablet PC), cash dispenser (ATM), public inquiry system (kiosk), etc. In traditional resistive touch panels, the impedance of the resistive elements around the edges is proportional to the distance between the edges of the panel, making the resistance value on both sides of the frame smaller than the resistance value in the middle of the frame #, which in turn causes the voltage in the middle of the panel frame to be greater than the sides of the frame The voltage value is low, forming a voltage equipotential line with a depression in the middle. These depressed voltage isobaric lines will cause the position sensed by the touch panel to deviate from the actual position, and thus reduce the range of its active region. As shown in the first figure, when the voltage is applied to the compensation element in the prior art, it is a schematic diagram of the voltage isobaric line parallel to it. The resistive element core is connected in series from both sides to the middle, so its impedance value also increases from both sides to the middle. When there is no compensation element ea, eb and 5v voltage is applied to both sides at the same time, it is like a dashed line U. Voltage isobaric line. The compensation elements ea and eb achieve the purpose of compensating voltage by the value of the overall resistance of the resistive element. The width of the compensation element A is greater than the width of the compensation element ~, so = jea extends to the surface of equal resistance by x length. Impedance < Compensation element Impedance of resistance surface extending X length. That is, the impedance on both sides

1246025 V. Description of the invention (2) == high impedance compensation; and add low element two p, $ J to the place where the middle impedance is high, so that the average value of each section is calculated by connecting different amounts of resistive A The difference in the impedance value is to make the voltage isobaric line 110 become electric. However, the X required to reach the voltage isobaric line 120 is large, and there will still be some slight depression between the two pieces, so the level. . The resistance surface extends X length to reach the voltage isobaric line 120 ′ and its i ϊ ϊ :::: When the compensating element is applied with a voltage, it affects the schematic diagram of the resistance voltage line. The additional 5 V voltage decreases as the impedance of the U: increases, thereby forming a plurality of near-compensation-Du Jian isoelectric lines. However, these voltage isobaric lines 21 〇 will be compensated by the compensation element e when Ϊ ΐ 、, and the edge of%. , ~ Attraction

The phenomenon of bending 'This phenomenon also causes the range of the touch panel, and the position of ❾ is deviated', and thus reduces the recurrence of its action area: ί: i 7 ίThe shortcomings of resistive touch panels have real Need to hold. The present invention provides a method and a device to overcome various deficiencies in the prior art. [I: Intrinsic] is a method and a device for solving the various deficiencies in appeals. In the background of Ban Huiming, the resistive touch surface in the conventional art is too ] Άί The purpose of the invention is to provide a resistance-type: control panel with voltage compensation to improve various shortcomings in the conventional art. One of the objects of the invention In order to provide a resistance type with voltage compensation, page 7 1246025 V. Description of the invention (3) The edge compensation element linearly improves the voltage isobaric line of the depression of the touch panel. Another object of the present invention is to provide a device with voltage compensation. The electric touch panel, ... the structure and layout of good compensation components, increasing the range of the board's action area. Ηί: 月 之 ^ One purpose is to provide a resistive type with electrical willingness to compensate: the control panel 'Xiao You applies high impedance materials Increase the sensitivity between touch distances. According to the above description, the present invention provides a resistive touch panel including: a rectangular substrate; a uniform resistive surface ), Which are evenly coated on the rectangular base; a plurality of resistive elements are formed on the four edges of these resistive surfaces, thereby generating a rectangular electric field (tT1 field) inward when a voltage is applied; a plurality of compensations The elements are formed at intervals around the edges of this table. Among them, the ruler of the plurality of compensation elements is proportional to the edge distance of the f resistance surface, and the interval between the phantom leather and the surface is inversely proportional to the edge distance, that is, 'The size of the multiple compensation elements is smaller on both sides of the surface of equal resistance, and larger in the middle of the surface, and the distance between each other is wider on the sides of equal resistance 1, and in The equi-resistance surface compensates for the internal contraction caused by the rectangular electric field described above: the contact pressure film 'has a conductive material on the lower surface of the iso-resistance surface, and a plurality of insulating materials, which are evenly distributed among the equal-coated films. Electricity and surface and contact Page 8 1246025 V. Description of the invention (4) [Embodiments] Some embodiments of the present invention will be described in detail as follows. However, the present invention can also be widely used in addition to the above. His implementation: The scope of the present invention is not limited, which is subject to the scope of subsequent patents. And, in order to provide a clearer description and easier understanding of the present invention, the parts in the figure are not according to their relative dimensions Drawing, "The proportions of these dimensions and their related dimensions have been exaggerated; irrelevant details are also drawn for simplicity of the illustration.% As shown in the third A diagram, the compensation elements R0 ~ R2 are Adjust the overall impedance value of the resistive element r to achieve the purpose of compensating the voltage. Basically, the impedance of the compensating element h R0 > the impedance of the ratio > & Compensation of impedance; and in the place where the middle impedance is high, compensation of low impedance is added, whereby the average impedance difference caused by different numbers of resistive elements Rh connected in series in each section is averaged. As shown in Figure 38, it is a schematic structural diagram of a compensation element according to a preferred embodiment of the present invention. The compensation elements Rq ~ R2 are basically formed on a glass substrate coated with indium tin oxide (indium_tin 〇χί2 ^; ΙΤ0) by etching. When the height h is the same, the width of the compensation element & The width of Rq is based on the impedance value being inversely proportional to the width of the wire, so the impedance of & < Ri < R. Therefore, the above-mentioned purpose of averaging the resistance values of the resistive elements in each section is achieved. Among them, the compensation element R. The shape of ~ R2 is a rectangular structure in this embodiment (but it is not used to limit the shape structure of the compensation element of the present invention), and the relationship between the size and the distance between them is shown in the following first formula:

LCn = C (η wood ((DA / LA) 氺 RG + RL) 氺 C) / DB

1246025 V. Description of the invention (5))-LC0 •• Refer to the reference (the first formula) In the above first formula, η indicates the number of steps of the calculated compensation; LCn indicates the compensation width of the η section (units) : Inch); DA represents the silver paste line pitch of each segment (unit: inch) · LA represents the contact length (unit: inch) of the silver paste line and IT0 of each segment; ', RG represents Surface resistance of glass (unit ·· ohm); ， RL represents the resistance of the silver paste line (unit ·· ohm) of each segment; c represents the unit correction constant, about 45.3 (slightly different depending on the surface resistance of glass) DB indicates the pattern distance (unit ·· 忖) of silver paste; LC0 indicates the compensation width of the 0th segment, which is a known value (unit: English, for example: when the compensation of the 0th segment is 30 (0 · 03 inches) ), The fifth paragraph is: 480 (〇 · 48 inches). The calculation process is as follows in the following second formula · 45.3) / 7.19)-30 = 480 LC5 = ((5 * ((〇 02 / 〇 73 ”500 +: 5 ·) * (Second formula) The above-mentioned data are only the preferred values of this embodiment, and the values can be adjusted according to actual conditions. Different materials are used to make corrections to achieve the most accurate results. In this embodiment, the compensation elements Rq ~ A have a large difference in resistance value due to the time remaining y, so the required The height h is formed earlier, and the length of X in X is short, and the connection compensation space in the previous technique is omitted. Therefore, the range of the panel action area is increased. In addition, the bow-line embodiment can be Low temperature silver paste (si 1 ver pas te)

1246025 V. Description of the invention (6) The material is based on the high-resistance characteristics of the low-temperature silver paste (its impedance value is about 10 times that of the high-temperature silver paste), so it can generate enough voltage difference for even a small pitch for the Sensing 'thus improves the sensitivity of the touch panel to sense a short distance, and improves the phenomenon of edge bending shown in the second figure in the prior art. As shown in FIG. 4A, it is a schematic diagram of the compensation element compensating the voltage isobaric lines parallel to this embodiment. The dotted line 41 is the compensation compensation of the resistive elements 404 and 404 in the prior art by the compensation element (not shown). The solid line 420 is the compensation elements 401 and 402 of this embodiment. , 402, (formed on the surface of the isoelectric resistance by etching) the correction compensation for the voltage isoelectric line. The difference between the two is that the pressure isobaric line 420 is closer to the edge of the panel than the voltage isobaric line 410, which is to reduce the lead space and inward extension length of the connection compensation element, which increases the panel's operating area Range. In addition, the linearity of the voltage 420 is also straighter than the voltage isobaric line 41 °, because the compensation element 403 is further added in the middle of the compensation $, 402 to perform detailed voltage compensation, which only needs to be smaller than X in the previous technology. The length γ can obtain a straight voltage isobaric line 420 '. Therefore, in this embodiment, the depression condition of the voltage isobaric line shown in the figure is changed to make the bearing 1 ", 上 上 弟 一一, ^ ^ ^ ^ ^ ^ ^ ^ As a result, the trend is more linear and the range of the panel action area is enlarged. In the same way, for example, ′ is a schematic diagram showing that the compensation element pair of this embodiment does not affect the μ histogram. The solid lines 404, 404 'are resistive = yield 43 here. It is the compensation element in the prior art (the influence of one piece of two-not-graph pressure line, and the solid line 440 is the supplementary voltage of this embodiment, etc., 402, 403 (formed on the isoelectric part 4 by the last name engraving method) 〇1, 4〇2 (on the surface and above the surface) on the electricity 1246025 V. Description of the invention (7) The voltage isobaric line. By using the low-temperature silver paste high impedance characteristics of the voltage difference, and the compensation element 401, 402, 402, and 403 are placed at equal distances on the two resistive elements 4 04 and 4 04 'to achieve the effect of equalizing the voltage. The voltage isobaric line 430 is corrected to the voltage isobaric line 440, thereby improving the position in the second figure above. It shows the bending condition of the two ends of the voltage isobaric line, which makes it more i-oriented. The fifth diagram A is a schematic structural diagram of a resistive touch panel with voltage compensation according to the present invention. The fifth diagram B is the fifth diagram of the fifth A diagram. A cross-sectional side view of a resistive touch panel. Referring to FIG. 5A and FIG. 5B, a resistive touch panel with voltage compensation according to the present invention includes at least a rectangular substrate 51 and a resistive surface 520. A plurality of resistive elements 53, a plurality of compensation elements 540, and a pressure-contact film 5 50. The rectangular substrate 51 is basically a rectangular glass substrate or a soft transparent printed circuit board. The resistive surface 520 is evenly coated on the rectangular substrate 51, and the coating material is on Bebesch. In the example, it is indium tin oxide (indium oxide; 1.0). A plurality of resistive elements 530 are formed at the peripheral edges of the iso-resistive surface 52 ′, thereby generating a rectangular electric field inward when a voltage is applied. 'The resistive element 5 3 0 uses low-temperature silver (s 丨 1 verpas ^ e) as its material, and based on the high-resistance characteristics of low-temperature silver paste (its resistance value is about 10 times that of high-temperature silver paste), it will cause The touch panel can generate enough voltage difference for detection and induction even within a small pitch. A plurality of compensation elements 540 are formed at intervals on the peripheral edges of the iso-resistance surface 52. Among them, the plurality of compensation elements 54 The size of 〇 is directly proportional to the edge distance of the surface 5 2 0, and the interval between them is inversely proportional to the surface of the constant resistance table 1246025 V. Description of the invention (8) The edge distance of the surface 520 is inversely proportional, that is, this The dimensions of the plurality of complements are smaller on both sides of the surface of equal resistance, while in the middle of the surface of equal resistance are larger shapes, and the distance between them is equal to the distance between the sides: The middle of the surface of the equal resistance is narrower. By this, the above-mentioned voltage equalization voltage of the rectangular electric field is compensated. The relationship between the size of the compensation element 540 and the distance between them is described as follows: LCn =: ((n * ((DA / LA) * RG + * C) / DB)-LCO, where n indicates the number of segments of the calculated compensation; LCn indicates the η, the compensation width of the segment (unit: inch); ^ indicates Silver paste line spacing of each segment (unit: inch); to indicate the contact length of each silver paste line with ITO (unit: inch); RG represents the surface resistance value of glass 7 ^ from the mother ( Unit: Ohm RL means the silver paste line resistance value (unit: Ohm); C means unit correction constant, about 45.3; DB means silver paste pattern distance (unit ·· inch); and LC. Represents the 0th stage compensation width, which is a known value (unit: inch). In addition, the material of the above-mentioned multiple & compensation elements 540 is substantially the same as the material of the iso-resistance surface 52 ′, which is formed by removing the iso-resistance surface of the region 5 4 ′ during the iso-resistance surface 5 2 0 etching process. A plurality of compensation elements 5 4 0. A touch pressure film 550 has a conductive material 560 coating on the lower surface facing the constant resistance surface 520. The touch pressure film 55 may be a transparent elastomer film, and the coating of the conductive material is oxidized in this embodiment. Indium tin (ITO). A plurality of insulating substances 570 are evenly distributed between the isoelectric surface 52 and the contact pressure film 550 to form a dot spacer that separates the isoelectric surface 52 and the contact pressure. Film 55〇, to prevent 1246025 V. Description of the invention (9) To prevent accidental contact between the two. The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of patent application for the present invention; all other equivalent changes or modifications made without departing from the spirit disclosed by the present invention shall be included in the following The scope of patent application.

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Simple description of the formula [Schematic description of August] The first and second diagrams are the schematic diagram of the effect of the compensation element on the voltage isobaric line in the conventional technique; the third diagram A is the compensation element on the resistive element in the conventional technique Compensation is not intended. The third diagram B is a schematic diagram of the compensation element of a preferred embodiment of the present invention. The fourth diagram A and the fourth diagram B are a preferred embodiment of the present invention. 'A good schematic diagram; FIG. 5A is a preferred embodiment of the present invention; and FIG. 5B is a cross-sectional side view of FIG. 5A. [Representative symbols of main parts] 110, 120, 120 ', 210, 410 ~ 440, 420' voltage isobaric lines 4 (Π ~ 403, 402 ', ea ~ ed, Rq ~ R2 compensation elements 404, 404' resistive Element 510 Rectangular base layer 520 Etc. resistive surface 530 Etc. resistive element 540 Compensation element 540 'Etc. resistive surface area 550 Touch pressure film 560 Conductive coating 570 Insulating material Rh, Rv Resistive element

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Claims (1)

1246025 VI. Application for patent scope! · A resistive touch panel with voltage compensation includes: a rectangular substrate; a uniform resistive surface, which is evenly coated on the rectangular substrate; a plurality of resistive elements to form At the peripheral edges of the resistive surfaces, a rectangular electrical field is generated inward when a voltage is applied; a plurality of compensation elements are formed on the four or four peripheral edges of the resistive surfaces at intervals by etching. Among them, the size of the plurality of compensation elements is proportional to the edge distance of the resistive surfaces, and the interval between each other is inversely proportional to the edge distance of the resistive surface, thereby compensating the isobaric lines ( e (luip〇tential lines); a pressure-sensitive film having a conductive material coating on the lower surface facing the resistance surfaces; and a plurality of insulating materials evenly distributed between the resistance surfaces and the pressure-sensitive film. ^ 2. The voltage-compensated resistive touch panel as described in item 1 of the scope of the patent application, wherein the rectangular base layer described above A glass substrate. 3 · The voltage-compensated resistive touch panel as described in item 1 of the patent application scope, wherein the material of the above-mentioned resistive surface includes indium-tin oxide (ITO). 4 · If applied The voltage-compensated resistive touch panel described in the first item of the patent scope, wherein the material of the plurality of resistive elements is a low-temperature silver paste ° Page 16 1246025 5. The resistive touch panel with voltage compensation as described in item 1 of the patent claim, wherein the sizes of the above-mentioned plurality of compensation elements and the distances between them include the following calculation steps: LCn = ((n * ( (DA / LA) * RQ + RL) * C) / DB)-LCO, Among them, “n” indicates the calculated compensation stage, LCn indicates the compensation width of the ^ th stage (unit: inch), DA indicates the line pitch of silver paste (unit: inch) for each segment, and LA indicates each The length of the contact between the silver polyline of the segment and ITO (unit: inch), "represents the surface resistance of the glass (unit: ohm), RL represents the resistance of the silver paste line (unit: ohm) of each segment, and C represents the unit correction constant , About 45.3, DB represents the distance of the silver paste pattern (unit: inch), lc0 represents the compensation width of the 0th stage, which is a known value (unit: inch). The resistive touch panel with voltage compensation according to item 1, wherein the above-mentioned touch pressure film is a transparent elastomer film. 7. The resistive touch panel with voltage compensation according to item 1 of the patent application scope, wherein The coating material on the lower surface of the above-mentioned pressure-sensitive film includes indium tin oxide (indium -1 i η ο X ide; IT 0) 〇 8. The voltage-compensated resistive touch panel as described in item 1 of the scope of the patent application, wherein the plurality of insulating materials described above form a spaced-apart dot spacer to separate the resistive surfaces from the resistive surface. The touch pressure film. 9. · An iso-resistive surface for a resistive touch panel with voltage compensation, comprising: 1246025 The scope of the patent application ^ Several resistive elements are formed on the four perimeters of these resistive surfaces, thereby generating a rectangular electric field inward when a voltage is applied; and f several compensation elements' for etching Are formed at intervals around the disc! ^ =, Where the dimensions of the plurality of compensation elements are proportional to the edge distance of the surface and inversely proportional to the edge distance of each other ’s surface, thereby compensating the rectangular electrical The isopotential Hnes produced. 7 Electrical Λ Λ Special / Scope Item 9 is used for resistive touch surface with voltage compensation, etc. The surface of the resistive surface is made of indium tin oxide (1: tin oxide; ITO) 〇11 and as stated: Scope 2 for the resistive contact 2 = 2: 1 surface with voltage compensation, in which the above-mentioned plurality of resistive elements: Material is low / dish silver paste (S1lver paste) 〇1 2 · If the scope of patent application The iso-resistance surface of the control panel controlled by item g, m, ^ ^ ^ m ^, the material of the above-mentioned plural four-member components is the same as that of the four-resistor surface. 1 3 · The iso-resistance meter on the control panel as described in item 9 of the scope of the patent application ... =; the modified resistive contact includes a rectangle. The order of the above-mentioned plurality of compensation elements 14 · As the resistance meter of the control panel described in item 9 of the scope of the patent application ... The resistance-type touch-screen of Zhongxian is attached to each other's door—Γ. The size / distance between each other includes the following calculation steps: LCn = ((… ㈠A / LA) ”G + RL” c 1246025 VI. Scope of patent application ) / DB)-LC0, where η represents the calculated segment of the compensation, LCn represents the compensation width (unit: inch) of the η segment, DA represents the silver paste line spacing of each segment (unit: (English pair), LA represents the length of the silver paste line in each segment and ITO (in inches), RG represents the surface resistance of the glass (unit: ohms), and RL represents the resistance of the silver paste line in each segment (unit: ohms) ), C represents the unit correction constant, about 45 · 3, DB represents the distance of the silver paste pattern (unit: inch), and LC0 represents the compensation width of the 0th stage, which is a known value (unit ·· inch) ). Page 19