TWI710947B - Linear adjustment and compensation method and structure for resistive touch panel - Google Patents

Abstract

The present invention relates to a linear adjustment and compensation method and structure for a resistive touch panel, in particular to a linear adjustment and compensation method and structure that can improve linearity accuracy, which is mainly extended with "I"-shaped electrode elements as a base An electrode loop is formed. The electrode loop includes an outer conductive chain and an inner gradient chain that are connected in series around the conductive glass substrate to form a ring. The feature of the present invention is to physically adjust the outer conductive chain in series. The area of the conductive glass conduction area of the conductive glass can be used to control the size of the terminal input distribution current, which is used to balance the electrode output voltage and form a uniform electric field effect. In addition to improving the linear accuracy of resistive touch panel products, In addition to solving the surface impedance variation of the ITO conductive film due to the high temperature activation crystallization reaction, it can greatly improve the product process yield and effectively enhance the product's added value and competitiveness.

Description

Linear adjustment and compensation method and structure for resistive touch panel

The present invention belongs to a touch panel electric field homogenization technology, specifically refers to a resistive touch panel linear adjustment compensation method that can adjust the conduction area to control the amount of current at the end point, so as to balance the electrode output voltage, and Form a uniform electric field effect.

Touch panels have been widely used in various electronic products, especially on the surface of display screens. With a display screen with a touch panel, users can directly click and press on the screen with their fingers or pen to operate, thereby providing a more convenient and user-friendly operation mode. The touch panel is distinguished from the technical principle, which can be divided into resistive technology touch panel, capacitive technology touch panel, infrared technology touch panel, surface acoustic wave technology touch panel, electromagnetic technology touch panel and optical technology touch panel, etc. . Among various types of touch panels, resistive touch panels are more popular. This is because resistive touch panels have lower manufacturing costs and better size compatibility with end products, so they can be widely used in electronic products.

Resistive touch panels are divided into four-wire and five-wire, six-wire or eight-wire resistive type. For the five-wire resistive touch panel, it consists of a two-layer structure, which includes a conductive glass substrate [ITO glass] and a conductive film on the conductive glass substrate [ITO film], the surface of the conductive glass substrate The surface is plated with a transparent conductive layer [ITO conductive layer], and a ring-shaped electrode circuit is printed around it; the lower surface of the conductive film is also plated with a transparent conductive layer and a silver wire is printed around it as a sensor conduction. There are many fine transparent insulators between the two layers to keep the conductive glass substrate and the conductive film insulated to ensure that when the user does not touch the panel, the two upper and lower structures will not conduct and cause misinterpretation. .

The working method of the aforementioned five-wire touch panel is that the transparent conductive layer of the conductive glass substrate is responsible for coordinate sensing in the X-axis [horizontal axis] and Y-axis [vertical axis] directions at the same time, on the electrode loops around the conductive glass substrate. According to the distinction between X-axis and Y-axis, a fixed voltage [such as 5V] is applied to one end of the X-axis or Y-axis electrode circuit, and the other end is 0V, so that the touch area formed between X-axis and Y-axis is formed Uniform voltage distribution, and the conductive film is only responsible for signal feedback.

However, the manufacturing process of the five-wire resistive touch panel is extremely precise, and its electric field uniformity needs to be higher than that of the general four-wire resistive touch panel. Therefore, the resistance value of the surrounding silver wires must be very uniform, otherwise it is very easy to cause The uneven voltage distribution on the working surface makes the coordinate position of the actual touch point incorrectly judged, and even makes the touch panel unable to move. The existing improved method is to try to establish a uniform position through the pattern configuration of resistive elements around the edge electric field. For example, US Patent Publication No. 6,593,916, US Patent Publication No. 2006/0119587, Taiwan Publication No. 201032098, Taiwan Publication No. 201032119, Taiwan Publication No. 201122945, etc., which respectively penetrate the periphery of the touch area The ring-shaped electrode circuit formed by different discontinuous electrodes can improve the aforementioned problem of uneven voltage distribution.

But because the ITO glass is baked at a high temperature of 500℃ in the process, it will drive The ITO conductive layer produces activation and crystallization reactions. When ITO is at a high temperature, oxygen atoms fill the gaps, resulting in a decrease in the carrier mobility, thereby reducing the conductivity, causing the surface impedance to vary (400Ω→800Ω), which affects the uniform electric field Effect, and even reduce its linear accuracy, which affects the product's process yield. In other words, if this problem can be solved, it is believed that the voltage output by the electrodes can be balanced and a uniform electric field effect can be formed. This is also an important issue that the industry urgently wants to break through.

The reason is that the inventors have made an in-depth discussion on the problem of uneven electric field after high-temperature baking of the existing resistive touch panels, and through years of experience in R&D and manufacturing in related industries, they actively seek solutions, and continue to After diligent research and trial production, we finally succeeded in developing a method and structure for linear adjustment and compensation of resistive touch panels to overcome the existing shortcomings of activation and crystallization of the ITO conductive layer driven by high-temperature baking.

Therefore, the main purpose of the present invention is to provide a linear adjustment and compensation method for resistive touch panels that can form a uniform electric field effect. By physically adjusting the conductive area of the ITO conductive layer, the output voltage is balanced to form Uniform electric field effect.

In addition, the second main purpose of the present invention is to provide a resistive touch panel linear adjustment compensation structure that can correct the surface impedance variation of the ITO conductive layer due to the high-temperature activation crystallization reaction, thereby improving the linear accuracy of the product and improving the product manufacturing process. Yield rate.

Furthermore, another main purpose of the present invention is to provide a linear adjustment compensation method and structure for a resistive touch panel, which can improve the reproducibility and stability of the touch panel, and further enhance the reliability and reliability of the product.

Accordingly, the present invention mainly implements the aforementioned objectives and effects through the following technical means; it includes a conductive glass substrate and a conductive film provided on the conductive glass substrate. The upper surface of the conductive glass substrate is provided with There is a transparent conductive layer with a ring-shaped electrode circuit around it. The electrode circuit is composed of a conductive chain adjacent to the outer side and a gradient chain adjacent to the inner side. The electrode circuit is characterized in that the outer conductive chain of the electrode circuit is connected in series At least one cut-off section line is formed on the surface of the conductive area of the transparent conductive layer, so that each cut-off section line can change the size of the conduction area by destroying the integrity of the transparent conductive layer or the conductive chain.

In this way, through the specific realization of the aforementioned technical means of this invention, the conductive area of the transparent conductive layer of the touch panel of the present invention can be adjusted after physically destroying the integrity of the transparent conductive layer or the conductive chain electrode element, thereby changing the conductive chain. The conductive area of the transparent conductive layer is used to control the current output so that the voltage is evenly distributed, that is, to form a uniform electric field effect, and can improve the reproducibility and stability of the touch panel, and greatly enhance the reliability and reliability of the product. This method can effectively improve the linear accuracy of the product, and can also greatly increase the product process yield, thereby increasing the added value of the touch panel and its economic benefits.

In order to enable your reviewer to further understand the composition, features and other purposes of the present invention, the following is a preferred embodiment of the present invention, accompanied by detailed descriptions in conjunction with the drawings, and at the same time allows those familiar with the technical field to implement it in detail.

(10)‧‧‧Conductive glass substrate

(11)‧‧‧Transparent conductive layer

(20)‧‧‧Electrode circuit

(21)‧‧‧Discontinuous resistance chain

(22)‧‧‧Conduction chain

(23)‧‧‧Graduated Chain

(25)‧‧‧Electrode element

(30)‧‧‧Transparent insulation

(40)‧‧‧Adhesive layer

(50)‧‧‧Conductive film

(51)‧‧‧Transparent conductive layer

(55)‧‧‧Silver Wire

(60)‧‧‧Break cut

The first figure: is a schematic diagram of the linear adjustment and compensation method and structure of the resistive touch panel of the present invention, for explaining the phases of the components of the present invention Right relationship.

Figure 1: is a schematic diagram of the schematic structure of the touch panel of the present invention; Figure 2: is a schematic view of the appearance of the conductive glass substrate in the touch panel of the present invention; Figure 3: is the linear adjustment and compensation method of the resistive touch panel of the present invention And the schematic diagram of the plan layout of the preferred embodiment of the structure; the fourth figure: the partial configuration diagram of the preferred embodiment of the electrode loop structure of the present invention; the fifth figure: the other of the preferred embodiment of the electrode loop structure of the present invention Schematic diagram of partial configuration; Figure 6: a schematic diagram of the adjustment and compensation method flow diagram of the preferred embodiment of the electrode loop structure of the present invention; Figure 7: a schematic diagram of the loop impedance measurement of the X-axis and Y-axis of the resistive touch panel; Figure: is a schematic diagram of the electrode loop correction of the linear adjustment and compensation structure of the resistive touch panel of the present invention; Figure ninth: is a schematic view of the measurement structure of the present invention before the linear adjustment compensation correction; and Figure ten: the present invention is performed Schematic diagram of the measurement structure after linear adjustment compensation.

The present invention is a method for linear adjustment and compensation of a resistive touch panel and its structure. In the specific embodiments of the present invention and its components illustrated in the accompanying drawings, all about front and back, left and right, top and bottom, top and bottom, The horizontal and vertical references are only used for the convenience of description, and are not intended to limit the present invention, nor to restrict its components to any position or spatial direction. The drawings and the sizes specified in the specification can be changed according to the design and requirements of the specific embodiments of the present invention without departing from the scope of the patent application of the present invention.

The present invention is a five-wire resistive touch panel. As shown in the first and second figures, the touch panel is generally composed of a two-layer structure, which includes a conductive glass substrate (10) [ITO Glass] and a A conductive film (50) [ITO Film] arranged on the conductive glass substrate (10), the upper surface of the conductive glass substrate (10) is plated with a transparent conductive layer (11), and a ring is printed around it The electrode loop (20); and the conductive film (50) is also plated with a transparent conductive layer (51) on the lower surface, and silver wires (55) are printed around as a sensor conduction, and the conductive glass substrate (10) An insulating adhesive layer (40) is arranged between the two layers of the conductive film (50), so that the conductive glass substrate (10) and the conductive film (50) can be pasted into one body, and the conductive glass substrate (10) and the conductive film (50) There are many fine transparent insulators (30) printed in the space enclosed by the inner edge to keep the conductive glass substrate (10) and the conductive film (50) insulated from each other to ensure that the user does not touch the panel When the two upper and lower layers are connected, the upper and lower structures will not be connected and cause misinterpretation. As shown in the third and fourth figures, the electrode circuit (20) is composed of a discontinuous resistance chain (21) and a discontinuous resistance key (21). ) Is composed of a conductive chain (22) on the outside and a gradation chain (23) formed on the inside of the discontinuous resistance key (21). Regarding the detailed structure of a preferred embodiment of the electrode circuit (20) of the present invention, Please further refer to the figure shown in Fig. 5, the electrode circuit (20) of the present invention uses the "I"-shaped electrode element (25) as a base extension. The regular series connection constitutes a circular conductive chain (22) and a gradient chain (23), and the feature of the present invention is that the transparent conductive layer between the series connection of the outer conductive chain (22) in the electrode circuit (20) is physically adjusted (11) The area of the conductive area, the physical method can be selected from ultrasonic electric cutters, laser equipment [nd-YAG laser, or UV laser], mechanical tools, which are connected to the corresponding electrode circuit (20) At least one cut-off section line (60) is formed on the surface of the transparent conductive layer (11) of the conductive chain (22), for each of the cut-off section lines (60) to penetrate the transparent conductive layer (11) or the conductive chain (22) electrode element (25) Completeness.

The steps of the present invention to complete the aforementioned structure are shown in Figure 6, which is after the electrode circuit (20) is printed and baked. Carry out the linearity test of the electrode circuit (20), if the linearity test is unqualified (NG), use physical means to perform linear correction compensation, for example, use an ultrasonic electric knife to form between the outer conductive chains (22) of the electrode circuit (20) At least one cut-off line (60) is used to adjust the conductive area area of the transparent conductive layer (11). After that, perform the linearity test again, if it fails, repeat the linear correction compensation action; on the contrary, whether it is after baking or linear correction compensation, if the linearity test passes (YES), then the transparent insulation (30) is printed . Then, the adhesive layer (40) is used for bonding the conductive glass substrate (10) and the conductive film (50) of the upper and lower structure. Then, the electrical connection of the flexible printed circuit board (Flexible Print Circuit; FPC) is performed. Finally, perform a functional test. If the test fails, heavy work is performed, otherwise, if the test is qualified, the product is manufactured and packaged.

Thus, it can be used to adjust the size of the conductive area of the transparent conductive layer (11) to control the size of the terminal input distribution current, which is used to balance the output voltage of the electrode circuit (20) to form a uniform electric field effect. A method for linear adjustment and compensation of a resistive touch panel and its structure.

As shown in Figures 7 and 8, the preferred conversion method of the linear adjustment compensation method of the present invention is that the length (X) and width (Y) dimensions of the touch panel actuation area correspond to 1.5% linear specification values, respectively. LX: 1.5%, LY: 1.5%, the touch panel actuation input voltage is 5V, the actual measured working high voltage in the actuation area is 3.5V~3.6V, the low voltage is 0.3V~0.4V, and the controller resolution is 4096 * 4096, assuming the case is an 8.4-inch touch panel, as shown in the seventh figure, the actual size of the active area is 171.4mm * 128.8mm. The ratio of the actual working voltage to the size of the active area can be calculated to get the X axis direction The corresponding unit voltage is 0.01866V/mm, the corresponding unit voltage in the Y-axis direction is 0.02484V/mm, the linear deviation of 1.5% of the LX specification value is about 2.571mm after conversion, and the corresponding voltage deviation is about 0.048V. Before adjustment from the above case The deviation value is LX: 2.01%, LY: 2.76% [as shown in the ninth figure], the actual conversion deviation is about LX: 3.445mm, LY: 3.554mm, which exceeds the established specifications; and the transparent conductive layer (11) After the open-circuit section line (60) is formed on the surface, the deviation values after linear correction adjustment are: LX: 1.00%, LY: 0.84% [as shown in the tenth figure], the actual conversion correction deviation is about LX: 1.714mm, LY: 1.082mm.

The calculation formula is as follows:

Where Rn: Resistance (impedance)

ρ: Electrical resistivity [5.12*10 ^-6 ] (conductivity)

L: Length[m] (length)

A: Area[m2] (area)

Rx: Loop resistance X (X-axis loop resistance)

Ry: Loop resistance Y (Y-axis loop resistance)

R1: UR and LR (upper right and lower right)

R2: UL and LL (upper left and lower left)

R3: UR and UL (upper right and upper left)

R4: LR and LL (bottom right and bottom left)

K: Correction factor[1.0~1.4] (correction factor)

Measure the circuit impedance of the X-axis and Y-axis of the electrode circuit (20) before calculation: [As shown in Figure 6]

X-axis loop resistance Rx=UR and LR, UL and LL.

It measures the resistance between UR and UL.

The Y-axis loop resistance Ry=UR and UL, LR and LL are short.

Measure the resistance between UR and LR.

The equation designed in this way is: A1: W=8.23*10 ^-3 m, T=10*10 ^-9 m, L=0.3*10 ^-3 m...(11)

RA1=18.663Ω

A7: W'=5.92*10 ^-3 m, T=10*10 ^-9 m, L'=0.3*10 ^-3 m...(12)

RA7=25.945Ω

R3=R4=RA1*6+RA7*2=163.868Ω

B1: W=7.43*10 ^-3 m, T=10*10 ^-9 m, L=0.33*10 ^-3 m...(13)

RB1=22.74Ω

B7: W'=3.76*10 ^-3 m, T=10*10 ^-9 m, L'=0.3*10 ^-3 m...(14)

RB7=40.851Ω

R1=R2=RB1*6+RB7*2=218.142Ω

Rx: loop resistance of X axis

R3=R4=163.868Ω.........................................(15)

Rx=110.611Ω

Ry: loop resistance of Y axis

R1=R2=218.142Ω.........................................(16)

Ry=141.792Ω

And its linear correction compensation method is to adjust the penetration of A7 and B7 appropriately. The length of the cut-off line (60) of the conductive area of the conductive layer (11) can be controlled by using ultrasonic electric cutters, laser equipment (nd-YAG laser or UV laser), and mechanical tools. The terminal input current is used to balance the electrode output voltage and form a uniform electric field effect.

After linear correction compensation, the results are as follows: A1: W=8.23*10 ^-3 m, T=10*10 ^-9 m, L=0.3*10 ^-3 m.....(21)

RA1=18.663Ω

A7: W'= 3.58*10 ^-3 m, T=10*10 ^-9 m, L'=0.3*10 ^-3 m...(22)

RA7=42.905Ω

R3=R4=RA1*6+RA7*2=197.788Ω

B1: W=7.43*10 ^-3 m, T=10*10 ^-9 m, L=0.33*10 ^-3 m.....(23)

RB1=22.74Ω

B7: W'= 2.42*10 ^-3 m, T=10*10 ^-9 m, L'=0.3*10 ^-3 m..(24)

RB7=63.471Ω

R1=R2=RB1*6+RB7*2=263.382Ω

Rx: loop resistance of X axis

R3=R4=197.788Ω............................................ (25)

Rx=133.506Ω

Ry: loop resistance of Y axis

R1=R2=263.382Ω...........................................( 26)

Ry=171.198Ω

Comparing the transparent conductive layer (11) to linearly compensate the aforementioned voltage value, where A7 before the correction: W'=5.92*10 ^-3 m, A7=25.945Ω, B7: W'=3.76*10 ^-3 m, B7= 40.851Ω; and the corrected result is A7: W'=3.58*10 ^-3 m, A7=42.905Ω, B7: W'=2.42*10 ^-3 m, B7=63.471Ω.

Derived from the above calculation formula, the conductive regions of the transparent conductive layer (11) at positions A7 and B7 can be adjusted after physically destroying the integrity of the transparent conductive layer (11) or the conductive chain (22) of the electrode elements (25), The conductive area size of the transparent conductive layer (11) of the conductive chain (22) is changed to control the current output to make the voltage evenly distributed, that is, to form a uniform electric field effect.

After the foregoing description of the composition, this adjustment method is suitable for five-wire resistive touch panel products, because the ITO glass is baked at a high temperature of 500°C during the process, which drives the ITO conductive layer to produce activation and crystallization reactions. The ITO is in a high temperature state. Due to the interstitial interstitial of oxygen atoms, the carrier mobility is reduced, the conductivity is reduced, and the surface Impedance variation (400Ω/□→800Ω/□), with the electrode circuit (20) structure of the improved "I"-shaped electrode element (25), in addition to the above, the outer conductive chain (22) can be physically adjusted in series The area of the conductive area of the transparent conductive layer (11) between the terminals is controlled to balance the output voltage of the electrodes, to form a uniform electric field effect, and to improve the reproducibility and stability of the touch panel, and greatly improve The reliability and reliability of the product. At the same time, this method can effectively improve the linear accuracy of the product, and can greatly increase the product process yield, and increase the added value and competitiveness of the product.

From this, it can be understood that the present invention is an extremely creative creation. In addition to effectively solving the problems faced by the habitants, it also greatly improves the efficiency. There is no creation or disclosure of the same or similar processed objects in the same technical field. Use, and at the same time have enhanced efficacy, so the present invention has met the requirements of "novelty" and "progressiveness" of invention patents, and an application for invention patents is filed in accordance with the law.

(10)‧‧‧Conductive glass substrate

(11)‧‧‧Transparent conductive layer

(20)‧‧‧Electrode circuit

(21)‧‧‧Discontinuous resistance chain

(22)‧‧‧Conduction chain

(23)‧‧‧Graduated Chain

(25)‧‧‧Electrode element

(30)‧‧‧Transparent insulation

(40)‧‧‧Adhesive layer

(50)‧‧‧Conductive film

(51)‧‧‧Transparent conductive layer

(55)‧‧‧Silver Wire

(60)‧‧‧Break cut

Claims (8)

A method for linear adjustment and compensation of a resistive touch panel. The touch panel is generally composed of a two-layer structure. It includes a conductive glass substrate and a conductive film arranged on the conductive glass substrate. The upper surface of the conductive glass substrate is It is plated with a transparent conductive layer, and a ring-shaped electrode circuit is printed around it; it is characterized in that: the transparent conductive layer of the conductive glass substrate is subjected to a linear test after the electrode circuit is printed and baked, and the linear test result is followed Physically adjust the size of the conductive area of the electrode loop to complete the linear correction compensation of the electrode loop. The linear adjustment and compensation method for resistive touch panels as described in the first item of the scope of patent application, wherein the physical method can be selected from ultrasonic electric cutters, laser equipment, mechanical tools, and is formed on the surface of the transparent conductive layer of the electrode circuit There is at least one open-circuit section line for each open-circuit section line to destroy the integrity of the transparent conductive layer. A linear adjustment and compensation structure for a resistive touch panel, which includes a conductive glass substrate and a conductive film arranged on the conductive glass substrate. The upper surface of the conductive glass substrate is provided with a transparent conductive layer, and a ring shape is provided around the conductive glass substrate. The electrode circuit is characterized in that: at least one open circuit profile is formed on the surface of the conductive area of the electrode circuit connected in series with the transparent conductive layer, so that each open circuit profile can be used to change the size of the conductive area by destroying the integrity of the transparent conductive layer ； Thereby, the size of the conductive area of the transparent conductive layer can be adjusted to form a linear adjustment and compensation structure of a resistive touch panel that forms a uniform electric field effect. A linear adjustment and compensation structure for a resistive touch panel, which includes a conductive glass substrate and a conductive film arranged on the conductive glass substrate. The upper surface of the conductive glass substrate is provided with a transparent conductive layer, and a ring shape is provided around the conductive glass substrate. The electrode circuit is composed of a conductive chain adjacent to the outer side and a gradient chain adjacent to the inner side, characterized in that: the conductive chain of the outer layer of the electrode circuit is connected in series with the transparent conductive layer on the surface of the conductive area formed with at least one The cut-off section line is used to change the size of the conduction area by destroying the integrity of the transparent conductive layer or the conductive chain; thereby, the size of the conduction area of the transparent conductive layer can be adjusted to form a group Linear adjustment and compensation structure for resistive touch panels that homogenize electric field effects. In the linear adjustment and compensation structure of the resistive touch panel described in item 4 of the scope of patent application, the electrode loop forms a discontinuous resistance chain between the conductive chain and the gradient chain. For the resistive touch panel linear adjustment compensation structure described in item 4 of the scope of patent application, the electrode circuit is extended with an "I"-shaped electrode element as a base, and a ring-shaped conductive chain and gradual connection are formed by regular series connection. Layer chain. As described in item 4 of the scope of patent application, the linear adjustment and compensation structure of a resistive touch panel, wherein the cut-off profile is formed by an ultrasonic electric cutter, a laser device or a mechanical cutter. The linear adjustment and compensation structure of the resistive touch panel as described in item 7 of the scope of patent application, wherein the laser device can be selected from nd-YAG laser, or UV laser.

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