TW201126402A - Capacitive touch-control panel - Google Patents

Abstract

The present invention relates to a touch panel, especially a capacitive touch panel. A capacitive touch-control panel is provided. A return electrode containing touch-control signal is formed on the capacitive touch-control panel or an application product having the capacitive touch-control panel, a touch-control detection electrode for detecting change in the touch-control signal and the touch-control return electrode are connected to different output terminals of a touch-control excitation source, respectively, then, a closed touch-control loop is formed among the touch-control excitation source, the touch-control detection electrode, the touch-control return electrode and a coupling capacitance between the touch-control detection electrode and the touch-control return electrode. The touch-control signal flowing from the touch-control excitation source to the touch-control detection electrode then flow back to the touch-control excitation source from the touch-control return electrode; and then a touch-control system is isolated from other systems to prevent from the signal cross-interference between the different systems, to allow the touch-control signal to flow in a closed system; the touch-control information is acquired by detecting the specific frequency or change in touch-control signal current with other specific features to prevent other signals or other environmental materials from interfering touch-control detection.

Description

201126402 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a touch screen, and more particularly to a capacitive touch screen. [Previous technology fi] [0002] Touch is the most important way of human perception, and it is the most natural way for people to interact with machines. Touch screen development has been widely used in many fields such as personal computers, smart phones, public information, smart home appliances, and industrial control. In the current touch field, there are mainly resistive touch screens, photoelectric touch screens, ultrasonic touch screens, and flat capacitive touch screens. In recent years, projected capacitive touch screens have developed rapidly. [0003] Resistive touch screen is still the leading product on the market, but the structure of the double-layer substrate of the resistive touch screen makes the touch screen reflective effect very much when the touch screen and the display panel are stacked together. Display quality such as brightness, contrast, color saturation, etc., greatly degrades the overall display quality, and increases the brightness of the backlight of the display panel, which also causes the power consumption to rise greatly; the analog resistive touch screen also has the problem of positioning drift. Position calibration is performed from time to time; in addition, the working mode of the resistive touch screen electrode contact makes the touch screen have a shorter life. [0004] Infrared touch screens and ultrasonic touch screens do not affect the quality of the display. However, infrared touch screens and ultrasonic touch screens are costly, and water droplets and dust can affect the reliability of the touch screen operation. In particular, the infrared touch screen and the ultrasonic touch screen mechanism are complicated and consume large amounts of power, so that infrared rays are made. Touch screens and ultrasonic touch screens are basically not available on portable products. 099102312 Form No. A0101 Page 4 / Total 66 Page 0993184754-0 201126402 [0005] The structure of the single-layer substrate of the flat capacitive touch screen enables the touch screen to display quality when the touch screen and the display panel are stacked together. The impact is small. However, the planar capacitive touch screen also has the problem of positional drift, and position calibration is performed from time to time; water droplets also affect the reliability of the touch screen operation; in particular, the planar capacitive touch screen consumes a large amount of power and costs, and also allows Planar capacitive touch screens are basically not available on portable products. [0006] ο ο The projected capacitive touch screen can still be a single-layer substrate structure, and when the touch screen and the display panel are stacked together, the touch screen has little effect on the display quality. However, the projected capacitive touch screen is used to measure the influence of the finger or other touch object on the coupling capacitance between the touch screen electrodes. Actually, the finger is detected by measuring the influence of the finger or other touch object on the charging and discharging of the touch screen electrode. Or the location of other touch objects on the touch screen. The anchor point needs to be analogized rather than a true digital touch screen. The distributed capacitance in the manufacturing and use environment will affect the reliability of the touch screen operation. The interference of the display drive signal and other electrical signals will affect the work of the touch screen. The water drop will also affect the reliability of the touch screen work. In addition, the projection The capacitive touch screen has high requirements on the resistance value of the detecting electrode line, so that the detecting electrode line of the projected capacitive touch screen used in combination with the display panel cannot have only a low conductivity transparent electrode layer. There is also a high-conductivity electrode layer such as metal, which is complicated in manufacturing process and high in cost, especially in the case of large-size or even large-size touch screens. The current capacitive touch screen, whether it is a flat capacitive touch screen or a projected capacitive touch screen, is used when it overlaps with the display screen, such as 099102312 Form No. 1010101 Page 5 / Total 66 Page 0993184754-0 [0007] 201126402 If there is no screen cover between the display screen and the touch screen, the display signal or display status on the display screen will interfere with the touch signal through the coupling capacitance between the display screen and the touch screen, which affects the touch. The reliability of the screen work. If a screen cover is placed between the display screen and the touch screen, the screen cover will reduce the transmittance of the touch screen to affect the display quality, and the cost will increase; if not between the display screen and the touch screen The screen cover, but to calculate and discriminate the software to eliminate the display interference, it also consumes considerable computing resources, making the detection speed slower and increasing the cost. [0008] Another weakness of the capacitive touch screen is that the touch screen can only be operated with a finger as a touch object. When the operator puts on the glove for touch, the response of the capacitive touch screen becomes very sluggish, even not working properly, and the touch screen cannot be operated with a conventional non-metallic stylus. [0009] In addition, Capacitive touch screens also suffer from poor water resistance. Touching the water droplets on the screen or even moisture causes the dielectric coefficient of the capacitive touch screen to change, which makes the reliability of the capacitive touch screen problematic. SUMMARY OF THE INVENTION [0010] The present invention is to provide a technical solution, so that the capacitive touch screen can not only interfere with the display of the touch detection, but also allows the operator to bring the gloves to work smoothly; The interference of the touch detection can work normally in the environment of moisture or water droplets; realize the high resolution of the capacitive touch screen. [0011] The basic technical idea of the present invention is: on a capacitive touch screen or with a 099102312 form number A0101 page 6 / 66 page 0993184754-0 201126402 Ο [0012] capacitive touch screen application on the touch The touch detection electrode and the touch return electrode are respectively connected to different output ends of the touch excitation source, and the touch excitation source, the touch detection electrode, and the touch reflow are respectively connected to the return electrode of the control signal. A closed touch loop is formed between the electrode and the coupling capacitance between the touch detection electrode and the touch return electrode, and the touch signal flowing from the touch excitation source into the touch detection electrode flows back from the touch return electrode to the touch excitation source. The touch system is isolated from other systems to prevent crosstalk between signals from different systems, allowing touch signals to flow in a closed system; to detect touch current changes at specific frequencies or other specific characteristics. Control information to prevent interference from other signals or other environmental substances to touch detection. The basic working principle of the capacitive touch screen of the present invention is that two sets of intersecting touch electrode groups are respectively disposed on different layers of the touch panel separated by an insulating layer, and the touch circuit has a touch excitation source and a touch signal. The detection circuit is configured to connect two adjacent touch electrode lines on the touch screen to two different output ends of the touch excitation source, one as a touch detection electrode and one as a touch return electrode. The touch signal flowing out from an output end of the touch excitation source flows into the touch electrode line connected thereto through the touch signal sampling component, and flows into the touch sensor through the coupling capacitance between the different touch electrode lines. The touch electrode lines of the different output ends of the excitation source flow back to the touch excitation source from the different output ends of the touch excitation source connected to the detected touch electrodes, and the touch signals flow on the closed touch loop. When a person's finger or other touch object approaches or touches two touch electrode lines connected to different output ends of the touch excitation source, the finger or other touch object changes the coupling capacitance between the different touch electrode lines, and the coupling capacitance changes. Let 099102312 Form No. 1010101 Page 7 / Total 66 Page 0993184754-0 201126402 The current of the touch signal on the touch loop also changes accordingly. The touch circuit sequentially connects two touch electrodes adjacent to the touch screen to two different output terminals of the touch excitation source, and simultaneously detects the change of the touch signal current on the output end by the touch signal detection circuit. Find the touch electrode line with the largest change in the touch signal current or the current change exceeding a certain threshold, so as to find the position of the finger or other touch object on the touch panel. [0013] Since the touch signal flows on a closed loop formed between the touch circuit and the different touch electrode lines on the touch panel, the non-metallic touch object having a different dielectric constant and air dielectric coefficient approaches or contacts. When the screen is touched, the coupling capacitance between different touch electrode lines can also be changed, resulting in a change in the touch signal current on the touch loop, so that the usual non-metallic stylus can also be used to operate the capacitive touch screen; When the touch object approaches or touches the touch screen, the metal touch object changes the effective coupling distance of the coupling capacitor electrodes between the different touch electrode lines, thereby changing the coupling capacitance between the touch electrode lines, resulting in the touch signal current on the loop. The change allows metal touch objects to be used to operate capacitive touch screens. [0014] Since the touch signal flows on the closed loop formed between the touch circuit and the different touch electrode lines on the touch panel, the touch object changes the coupling capacitance between the different touch electrode lines, thereby causing the touch loop. The change of the touch signal current; that is, as long as the characteristics and parameters of the device in the loop are changed, the touch signal current on the touch loop can be changed, and the leakage current is not required to be drawn from the touch electrode line of the touch screen. To let the touch signal detection circuit obtain touch information. In this way, the touch system (touchpad and touch circuit) and the display system (including the display screen, the backlight and its driving circuit) and the host circuit can be isolated, in particular, the touch circuit power supply and the touch 099102312 form No. A0101 Page 8 of 66 0993184754-0 201126402 The display circuit power supply used for superimposing the screen is isolated from the main power supply; the so-called isolation is to set the isolator between the touch circuit and the host and the display circuit to make the touch The signal does not flow smoothly between the two circuits. In this way, when the touch screen is overlapped with the display screen, the touch signal cannot flow from the touch screen and the touch circuit into the display circuit or the host circuit and then flows back to the touch circuit, thereby avoiding the touch screen, the touch circuit and the display. The coupling between the circuits and the host circuitry interferes with touch detection. [0015] 触控 ο [0016] The touch signal loop on the touch screen causes the change of the touch signal current on the touch loop only when the touch object touches the touch detection electrode and the touch return electrode at the same time. The crosstalk flow of the touch signals between the touch electrodes of the touch screen is reduced; and the touch excitation signals can be applied to the plurality of electrode lines at the same time, thereby further reducing the crosstalk flow of the touch signals and improving the touch electrodes. The accuracy of the judgment, the space-based capacitive touch screen. The touch electrode line is made fine enough, and the touch loop on the touch screen is very small in space, realizing a high-precision capacitive touch screen. By detecting the relative value of the amount of change of the touch signal on each electrode line to determine the touched electrode line, the resistance value of the electrode line can be reduced, and a large-sized or even oversized capacitive touch screen can be realized. When the surface of the touch screen is filled with water droplets, since the dielectric constant of water is much larger than the dielectric constant of air, the coupling capacitance between the touch electrodes at the water droplets changes, thereby changing the magnitude of the touch signal current. The touch circuit is misjudged as the operator's touch. In order to avoid the occurrence of misjudgment, the electrode is placed on the outer shell of the palm-type application product, and the electrode on the outer casing is selected as the touch reflow electrode, and the operator holds the palm of the application product. 099102312 Form No. 1010101 Page 9 of 66 0993184754-0 201126402 When the finger is close to or touches the touch screen, a coupling capacitor is formed between the finger and the touch electrode line, and the touch excitation signal on the electrode line flows into the finger through the coupling capacitor portion, by holding the application product. The palm of the hand flows into the touch reflow electrode on the outer casing of the application product, and then flows back from the touch reflow electrode to the touch excitation source to form a flow of the touch signal on the closed loop. The water droplet on the surface of the touch screen does not cause the connection between the touch electrode and the touch reflow electrode on the outer casing of the application product, so that the closed loop of the touch excitation source, the touch detection electrode and the touch return electrode cannot be formed. It does not affect the judgment of the touch circuit on the touch signal. The technical problem of the present invention is solved by the following technical solutions: [0018] A capacitive touch screen includes a touch substrate and a touch circuit, and the touch circuit has a touch excitation source and a touch signal detection circuit. The touch substrate is provided with a touch electrode group; when the touch substrate is provided with not less than two sets of touch electrodes, each group of touch electrodes is disposed on different touch substrates or separated by an insulating layer. The touch substrate is disposed on the application product, and the application product has a display system (including a display screen and a driving circuit thereof, a backlight and a driving circuit thereof); the first output end of the touch excitation source is used in the detecting period Applying a touch signal to the connected electrode lines at least part of the time; the touch signal detecting circuit is configured to select at least part of the electrode lines as the touch detection electrodes during at least part of the detecting period to detect whether the partial electrode lines are touched; The touch detection electrode refers to an electrode that detects a change of a touch signal flowing through the electrode while applying a touch signal to the electrode; When a part of the electrodes is selected as the detecting electrode, a part of the electrode lines of the touch substrate is selected as a touch reflow electrode; and the touch reflow electrode means that a touch is applied to the touch detecting electrodes. 099102312 Form No. A0101 Page 10 / A total of 66 pages 0993184754-0 201126402 [0019] ο ο [0020] 099102312 The control signal detects the moment through the change of its touch signal, connects to the second output of the touch excitation source or communicates with another touch excitation source a touch electrode that provides a return path for the touch signal on the detecting electrode. Another solution is: a capacitive touch screen includes a touch substrate and a touch circuit, the touch circuit has a touch excitation source and a touch signal detection circuit, and the touch substrate is provided with a touch electrode group; the touch substrate When there are no less than two sets of touch electrodes, the touch electrodes of each group are disposed on different touch substrates or are separated on the same touch substrate by an insulating layer; the touch substrate is disposed on the application product, The application product has a display system (including a display screen and a driving circuit thereof, a backlight source and a driving circuit thereof); an output of the touch excitation source is used to apply a touch signal to the connected electrode lines at least part of the detection period The touch-sensing detection circuit is configured to select at least part of the electrode lines as the touch detection electrodes to detect whether the partial electrode lines are touched during at least part of the detection period; the touch detection electrodes are in the pair The electrode is applied with a touch signal while 'detecting an electrode flowing through the touch signal of the electrode; the outer casing of the application product is provided with an electrode; the touch control circuit selects; The electrode on the outer casing of the product is a touch reflow electrode; the touch reflow electrode is a second output end connected to the touch excitation source or connected to another at the moment of applying the touch detection electrode The touch excitation source is a touch electrode that provides a return path for the touch signal on the detection electrode. The technical problem of the present invention is further solved by the following technical solutions. According to another aspect of the present invention, the touchback, the flow electrode is part of the page, and the form number A0101 [0021] 201126402 or all of the electrode lines that do not intersect the touch detection electrodes, or some or all of the electrode lines that intersect the touch detection electrodes, or some or all of the intersections with the touch detection electrodes Intersecting electrode lines. [0022] According to another specific aspect of the present invention, the touch reflow electrode that does not intersect the touch detection electrode is an electrode line on one side or both sides adjacent to the touch detection electrode. [0023] According to another specific aspect of the invention, the touch substrate is a flexible or rigid transparent substrate. [0024] According to another specific aspect of the present invention, the touch substrate and the flat panel display a screen-use substrate. [0025] According to another specific aspect of the invention, the touch electrode is a display screen electrode. According to another specific aspect of the present invention, an electrode line connecting the touch control circuit on the touch substrate is disposed on a touch surface or a non-touch surface of the touch substrate. According to another specific aspect of the present invention, the touch substrate has an electrode that is not connected to the touch circuit, in addition to the electrode line connected to the touch circuit. According to another specific aspect of the present invention, the touch circuit simultaneously performs touch detection on a plurality of touch detection electrodes on the touch control substrate. According to another specific aspect of the present invention, the plurality of touch detection electrodes on the touch substrate are detected in parallel. According to another specific aspect of the present invention, the plurality of touch detection electrodes on the touch substrate are independently detected. 099102312 Form No. A0101 Page 12 / Total 66 Page 0993184754-0 201126402 [0031] [0036] [0036] According to another specific aspect of the present invention, the plurality of independent detections The output of the touch excitation source connected by the touch detection electrodes is different. According to another specific aspect of the present invention, the touch detection signals on the different output terminals of the same touch excitation source and the touch control excitation source are different from each other. According to another specific aspect of the present invention, the difference in the touch signals refers to at least one of a magnitude, a phase, and a frequency of the touch signals. According to another specific aspect of the present invention, at least one output end of the same touch excitation source or different touch excitation source output ends connected to different electrode lines is connected to the ground end of the touch circuit. According to another specific aspect of the present invention, between the touch circuit and the host circuit and the display system of the application product, or between the touch circuit power supply and the host circuit power supply of the application product and the display system power supply, or the touch circuit A signal isolation device is disposed between the touch excitation source and the host circuit power supply and the display system power supply of the application product; the signal isolation device is a high resistance device of the touch signal. According to another specific aspect of the present invention, the touch electrodes on the touch substrate are a set of disjoint electrode lines, and the touch circuit determines the touched electrodes by comparing the magnitudes of the touch signals on different electrode lines to flow through The position of the touch signal on the touched electrode is positioned by the size of the touch signal change on the touch electrode. According to another specific aspect of the present invention, the touch electrodes on the touch substrate are a set of non-intersecting electrode lines, the different electrode lines have lead ends in different directions, and the electrode lines in different directions are used as detection electrodes; 099102312 Form No. 1010101 Page 13 / Total 66 Page 0993184754-0 [0037] The control circuit compares the size of the touch signal on different touch electrodes. · Determines the touched electrode and compares the touch on the detection electrode in the different direction. The size of the signal change locates the position of the touch point on the touched electrode. [0038] According to another specific aspect of the invention, the disjoint electrode lines are fold lines. [0040] The beneficial effects of the present invention compared with the prior art are: [0040] The technical solution of the present invention establishes a return electrode of a touch signal on a touch screen or an application product with a touch screen, in the touch circuit Forming a closed loop of the touch signal with the touch electrode, and then isolating the touch system from other systems, thereby reducing the crosstalk of signals between different systems, and preventing the influence of other signals, especially display signals, on the touch detection. [0041] The technical solution of the present invention forms a closed loop of the touch signal between the touch circuit and the touch electrode on the touch screen, and the touch object changes the coupling capacitance between the different electrode lines, so that the operator brings the glove. It can also work smoothly, allowing non-metallic pens and metal pens to operate the touch screen. The touch signal loop on the touch screen also reduces the crosstalk flow between the touch electrodes on the touch screen electrodes, improves the accuracy of the touched electrodes, and realizes the spatially digitized capacitive touch. Screen. [0042] The technical solution of the present invention is to provide a touch reflow electrode on the outer casing of the application product, and establish a closed loop of the touch signal between the touch circuit, the touch electrode on the touch screen and the touch reflow electrode of the outer casing. , to avoid the influence of water droplets on the touch circuit to determine the touch signal. [Embodiment] 099102312 Form No. A0101 Page 14 of 66 0993184754-0 201126402 [0046] [0046] [0047] The connecting lines in the following levels are not only representative of a single line connection, but also represent Multi-line connection relationship. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A capacitive touch screen 100 as shown in FIG. 13 includes a touch panel 110 and a control circuit 140. The touch panel 11 is provided with two sets of mutually orthogonal parent column electrode groups 120 separated by an insulating layer (the column electrode lines 121, 122, ..., 12i-2, 12i-1, i2i, 12iH, 12i + 2) ..... 12m) and row electrode group 130 (having row electrode lines 131, 132, ..., 13j-2, 13 j 1 13 j, 13 j + l., .i3j.: +2·..., .V3n ). The touch circuit 140 has a touch excitation source 15A and a touch signal detection circuit 16A. Touch, -..5 ί.Ι·"··.........,······ Γ - The touch signal frequency of the excitation source 150 is selected at 1 〇〇KHz or above. The touch signal detecting circuit 16 0 is composed of a signal detecting channel 丨6 丨, a data sampling channel 162, a data processing and a timing controller ι63; the signal detecting channel 161 has a touch signal sampling component 1611 'buffer 1612 and a differential amplifying circuit 1613. The data sampling channel 162 has an analog-to-digital conversion circuit; the data processing and timing control circuit 63 is a central processing unit (CPU, MCU) having a data computing capability and a data output input interface, and the central processing unit has a control software and a data processing software. . The touch signal detecting circuit 160 of the touch circuit 140 selects the electrode line 12i of the column electrode group 120 as a detecting electrode, and allows the electrode line 12i to communicate with the output end 151 of the touch excitation source 150 through the touch signal sampling element 1611. The other circuits of the signal detecting circuit 160 are connected to the two ends of the touch signal sampling component 1611; the electrode wires 12i-1 and 12i+1 in the column electrode group 120 are connected to the output end 152 of the touch excitation source 150 as a touch. The return electrode of the signal; and the coupling capacitance between the electrode line 12i and the electrode line 12i-1. 099102312 Form No. A0101 Page 15 / Total 66 Page 0993184754-0 201126402

The coupling capacitance Ci + 1 between the Ci-1 and the electrode line 12i + l forms a closed touch loop for the touch signal; let all the remaining column electrode lines and the row electrode group 1 3 0 of the column electrode group 1 2 〇 All of the row electrode lines are also in communication with the output terminal 151 of the touch excitation source 丨5 。. The touch signal flowing out from the output end of the touch excitation source flows into the column electrode line 12i via the touch signal sampling component 1611, and flows into the electrode line via the coupling capacitance Ci-i between the electrode line 12i and the electrode line 12i-1. 12i-l, the coupling capacitance Ci + 1 between the electrode line 〖2i and the electrode line 12 丨 + 1 flows into the electrode line 12i + l, and then flows back from the electrode line 12 b 1 and i2 i + i to the touch excitation source output terminal 152 The flow of the touch signal on the closed touch loop is shown in Figure lb. [0049] When the finger of the person as the touch object 170 approaches or contacts the column electrode line i 2 i, since the finger has a certain width, the column electrode line 12i-1 and the column electrode are also touched. Line 12i + i, the dielectric constant of the human body is much larger than the dielectric constant of the air, so that the capacitance of the combined capacitances C i -1 and C i +1 increases the capacitive reactance to reduce the current of the touch signal on the touch loop. Correspondingly larger, the equivalent circuit is shown in Figure lc. When the finger approaches or touches the position of the other column electrode lines other than 12丨, 'Although the coupling capacitance between the column electrode lines, the column electrode lines and the row electrode lines also changes, but because of the touched position The output of the touch excitation source 15A connected to each electrode is the same output end 151'. The change of the touch signal current flowing through the touch signal sampling component ι611 is very small. The touch circuit 140 sequentially connects the electrode lines of the touch screen through the touch signal sampling component 1611 to the output end 151 of the touch excitation source 15 同时 while simultaneously touching the touch electrodes on both sides thereof. The output end 152 ′ of the touch excitation source 150 is connected to all the remaining electrode lines to also connect the touch excitation 099102312 Form No. A0101 Page 16 / 66 page 0993184754-0 201126402 Source 150 output 151, while the touch signal detection circuit 16〇 detects the change of the touch signal current flowing through the touch signal sampling component 1611, and finds that the touch electrode line whose touch current current changes the most and exceeds a certain threshold is the touched electrode line; The intersection position of the touched electrode line and the touched electrode line in the row electrode group 130 is the touch position of the finger. [0050] The condition of the touched electrode line is determined, and only the electrode line that detects that the amount of change of the touch signal passing through exceeds a certain threshold is detected as the touched electrode line, so that the capacitive touch screen 100 allows simultaneous multi-touch control. 005[0051] 触控 Since the touch signal flows on a closed loop formed between the touch control circuit 140 and the different touch electrode lines on the touch panel 丨 1 (), the touch object 17 〇 has a dielectric constant and air When a non-metallic object with different dielectric constants approaches or touches the touch screen 100, the coupling capacitances Ci-Ι and Ci+Ι between adjacent touch electric lines can also be changed, resulting in changes in the touch signal current on the touch loop. The non-metallic touch object (such as the usual stylus) can also be used to operate the capacitive touch screen 100; when the touch object 170 approaches or touches the touch screen 100 with a metal object, the metal object is adjacent to the touch screen. The effective coupling distance between the touch electrode lines changes the surface capacitance C i _ 1 and ci + i between the touch electrode lines, causing a change in the touch signal current on the loop, allowing the metal touch object (such as a metal touch) The control pen can also be used to operate the capacitive touch screen 100. [0052] In the detection period, the column electrode line 12i in the column electrode group 120 is connected to the output end 151 of the touch excitation source 150 through the touch signal sampling component 1611, and other circuits of the touch signal detecting circuit are connected. Both ends of the control signal sampling component 1611; all remaining column electrode lines (including the column electrode lines 12i-i and i2i + i) of the column electrode group 12 are connected to the output terminal 152 of the touch excitation source 150 as a touch The return electrode of the control signal; let line 099102312 Form No. A0101 Page 17 / Total 66 page 0993184754-0 201126402 All the row electrode lines of the electrode group 130 are directly connected to the output end 151 of the touch excitation source 150. When the touch object 170 approaches or contacts the column electrode line 12i, the change of the coupling capacitances Ci-Ι and Ci+Ι can also be detected by detecting the change of the touch signal current flowing through the touch signal sampling element 1611. Touch the electrode line. [0053] In the detection period, the column electrode line I2i in the column electrode group 120 is connected to the output end 151 of the touch excitation source 150 through the touch signal sampling component 1 611. The other circuits are connected to both ends of the touch signal sampling component 1611; all the remaining column electrode lines (including the column electrode lines 12 i -1 and 12 i +1) in the electrode group 120 are connected to the output of the touch excitation source 150. 152 is connected; let all the row electrode lines of the electrode group 130 also communicate with the output end 152 of the touch excitation source 150. When the touch object 170 approaches or contacts the column electrode line 12i, the change of the coupling capacitances Ci-Ι and Ci+Ι can also be detected by detecting the change of the touch signal current flowing through the touch signal sampling element 丨61丨. The electrode line is touched. [0054] In the detection period, the column electrode line 12i is connected to the output end 151 of the touch excitation source 150 through the touch signal sampling component 1611, and the other circuits of the touch signal detecting circuit 160 are connected to the touch signal sampling component 1611. Both ends: all the remaining column electrode lines in the column electrode group 120 are also connected to the output end 151 of the touch excitation source 150, and all the row electrode lines of the row electrode group 130 are connected to the output end 152 of the touch excitation source 150. As the return electrode of the touch signal. When the touch object 170 approaches or contacts the column electrode line i2i, the coupling capacitance between the column electrode line 12i and the row electrode group 130 changes, and the change of the touch signal current flowing through the touch signal sampling element 1611 is detected. , to find the electrode line being touched. 099102312 Form No. A0101 Page 18 of 66 0993184754-0 201126402 [0055] The column electrode line 12i may also be connected to the output end 151 of the touch excitation source 150 through the touch signal sampling element 1611 during the detection period. The other circuits of the touch signal detecting circuit 160 are connected to the two ends of the touch signal sampling component 1611: all the remaining column electrode lines in the column electrode group 120 are also connected to the output end 151 of the touch excitation source 150, so that the row electrode group The electrode lines 131, 132.....13 j-1 in 130 are also in communication with the output end 151 of the touch excitation source 150: the electrode lines 13 j.....13n in the row electrode group 130 are both The output end 152 of the touch excitation source 150 is connected to serve as a return electrode of the touch signal. When the touch object 170 approaches or contacts the portion of the column electrode line 12i between the row electrode lines 131 to 13 j-1, the coupling between the electrode line 〗2 丨 and the electrode lines 12i-1, 12i + l The change in the dissolution also causes the coupling capacitance between the column electrode line 12i and the row electrode group 130 to change, but since the output terminals of the touch excitation source 15A connected to the electrodes are all the same at the touched position At the output end 151, the change of the touch signal current flowing through the touch signal sampling component 1611 is very small; when the touch object 170 approaches or contacts the portion of the column electrode line 12 i between the row electrode lines 13 j to 13n, The coupling capacitance between the column electrode line 12 i and the row electrode group 130 is changed, and the rotation of the touch excitation source 150 connected to the column electrode line 12i and the row electrode lines I3j.....13n at the touched position The end is different, and the change of the touch signal current flowing through the touch signal sampling component 1611 is large; by detecting the change of the touch signal current flowing through the touch signal sampling component 1611, the touched electrode line can be found. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0057] The capacitive touch screen shown in FIG. 1A includes a touch panel 11A and a touch circuit 140. The touch panel 11 is provided with two sets of mutually orthogonal column electrode groups 12 〇 (with column electrode lines 121, 122, respectively) with insulating layer phase 099102312 form number A0101 page 19 / total page 66 0993184754-0 201126402. .., 12i-2, 12i-1, 12i, 12i + l, 12i + 2, ..., 12m) and row electrode group 130 (with row electrode lines 131, 132.....13j-2, 13 j- 1, 13 j, 13 j + 1, 13 j + 2..... 13n). The touch circuit 140 has a touch excitation source i5〇 and a touch signal detection circuit 16〇. The touch signal frequency of the touch excitation source 150 is selected to be ιοοκΗζ or above. The touch signal detecting circuit 160 is composed of a signal detecting channel 161, a data sampling channel 162, a data processing and timing controller 163. The signal detecting channel 161 has a touch signal sampling component 1611, a buffer 1612, a differential amplifying circuit 1613, and the like; The sampling channel 162 has an analog-to-digital conversion circuit; the data processing and timing control circuit 163 is a central processing unit (CPU, MCU) having a data computing capability and a data output input interface, and the central processing unit has a control software and a data processing software. [0058] The touch signal detecting circuit 160 of the touch circuit 140 causes the electrode line 12i of the column electrode group 12 to communicate with the output end 152 of the touch excitation source 150 as a return electrode of the touch signal; and selects the column electrode group. The electrode lines 12i-1 and 12i+1 in the 120 are detection electrodes, and the electrode lines i2i-1 and 12i+1 are connected to the output end 151 of the touch excitation source 150 through the touch signal sampling component 1611. The other circuit of the circuit 丨6〇 is connected to both ends of the touch signal sampling component 1611; and the coupling capacitance between the electrode line i2i-i and the electrode line 12i, the coupling capacitance between the electrode line i2i + l and the electrode line I2i Ci + Ι, forming a closed touch loop of the touch signal; all the row electrode lines of the column electrode group 120 and all the row electrode lines of the row electrode group 13 直接 are directly connected to the output end 152 of the touch excitation source 150 . From the touch excitation source output terminal 151 through the touch signal sampling component 16π into the column electrode 099102312 Form No. A0101 Page 20 / Total 66 Page 0993184754-0 201126402 Line 12ι-1 and 12i + l touch signals, part of the electrode line The coupling capacitance ci -1 between the 12 Bu 1 and the electrode line 1 21 flows into the electrode line! 2 i, the capacitance ci + i between the electrode line 12i + l and the electrode line I2i also flows into the electrode line, and then flows back from the electrode line 12i to the touch excitation source output end 152; the other part of the column electrode line 12i-l And the coupling capacitance between the 12i + l and the row electrode line flows into the row electrode line, and then flows back from the row electrode line to the touch excitation source output end 152, and the flow of the touch signal on the closed touch loop, the equivalent circuit is Id diagram shows β 0 [0059] When the finger of the person as the touch object approaches or touches the column electrode line ί 2 ί ... . . . . . . . ' Since the finger has a certain casting width &gt; _, it also touches the column The electrode line 12i-1 and the column electrode line i2i + i, the dielectric constant of the human body is much larger than the dielectric constant of the air, so that the capacitance of the consumable capacitance and the capacitance of Ci + 增大 is increased, and the capacitive reactance is reduced. The current of the signal is correspondingly larger. The equivalent circuit is shown in the figure le. [0060] The touch circuit 140 sequentially touches the touch electrodes, and the electrode lines of the screen 1 are connected to the output end 151 of the touch excitation source 150, and the touch electrode lines adjacent to the two sides are touched. The touch control signal 160 is connected to the output end 152 of the touch excitation source 150, and all the remaining electrode lines are also connected to the output end 152 of the touch excitation source 150, and the touch signal detection circuit 160 detects the flow through the touch signal. The change of the touch signal current on the sampling component 1611 finds that the touch electrode line with the largest change of the touch signal current and exceeds a certain threshold is the touched electrode line; and the touched electrode line and the row electrode group in the column electrode group 120 The intersection position of the touched electrode line in 130 is the touch position of the finger. [0061] The condition of the touched electrode line is determined, and only the electrode line whose detected touch signal change amount exceeds a certain threshold value is detected as the touched electrode line, and the electric 099102312 form number A0101 is 21/66 Page 0993184754-0 201126402 The valley touch screen 100 allows simultaneous multi-touch. [0063] Since the touch signal flows on the closed loop formed between the touch control circuit 14 and the different touch electrode lines on the touch panel 110, the touch object (7) is based on the dielectric constant and the air. (4) The non-metal (four) series of series or near touch screen 100 can also change the coupling capacitances Cl-ι and Ci + i between adjacent touch electrode lines, resulting in changes in the touch signal current on the touch loop. A metal touch object (such as a conventional stylus) can also be used to operate the capacitive touch screen 100; when the touch object 170 approaches or touches the touch screen 100 with a metal object, the metal object changes the adjacent scale control electrode line. The effective coupling distance between them changes the coupling capacitance between the touch panel lines, causing the change of the touch signal current on the loop, so that the metal touch object (such as a metal stylus) can also be used to operate the capacitive touch. The screen is 1 inch. It is also possible to allow the column electrode lines 12i-2, 12i and 12i + 2 in the column electrode group 12A to communicate with the output end 151 of the touch excitation source 15A during the detection period as the return electrode of the touch signal; The electric circuit climbing 12i + l is connected to the output end 152 of the touch excitation source 15A through the touch signal sampling component 1611, and the other circuits of the touch signal detecting electrophonic signal 1 60 are connected to both ends of the touch signal sampling component 1611; All of the remaining column electrode lines of the column electrode group 12 and all row electrode lines of the row electrode group 130 are also in communication with the output terminal 152 of the touch excitation source 150. When the touch object 170 approaches or contacts the column electrode line 12i, the coupling capacitance between the electrode line 12i-2 and the electrode line 12 i -1 and the coupling capacitance between the electrode line 12 i -1 and the electrode line 12 i are also caused. The coupling capacitance between the electrode line 12i and the electrode line 12i + l, the coupling capacitance between the electrode line 12i + Ι and the electrode line 12i + 2 are all changed 'by detecting the flow of the touch signal through the touch signal sampling element 1611 099102312 Form No. A0101 Page 22 of 66 0993184754-0 201126402 [0064] [0065] ❹ ❹ 099102312 The change in flow can be found by the touched electrode line. DETAILED DESCRIPTION OF THE INVENTION The application product 200 of the capacitive touch screen shown in FIG. 2 includes a transparent touch panel 210, a touch circuit 24, a display system, and a host circuit 280. The touch panel 210 is provided with two sets of mutually orthogonal column electrode groups 220 spaced apart by an insulating layer (the column electrode lines 221, 222, ..., 22i-1, 221, 22U1, ...' 22n〇 and the row electrode group 230 (there is a row electrode line 231 '232 ..... 23j-1 ^ 23j &gt; 23j + l.....23η). The touch circuit 240 has a touch excitation source 25A and a touch signal detecting circuit 260. The output of the touch excitation source 250 is 251 and 252, and the touch signal frequency of the touch excitation source 250 is selected; the touch signal detection circuit 260 is composed of the signal detection channel 261, the data sampling channel 262, data processing and timing. The controller 263 is composed of a signal detecting channel 261, a control signal sampling component 2611, buffers 2612 and 2613, a signal buffer 2614, a differential amplifying circuit 2615, etc., wherein the signal filter 2614 has the capability of blocking the passage of the frequency other than the iOOKHzm number. The data sampling channel 262 has an analog-to-digital conversion circuit; the data processing and timing control circuit 263 is a central processing unit (CPU, MCU) having a data computing capability and a data output input interface, and the central processing unit has a control software and a data processing software. Display system The display screen 271, the display driving circuit 272, the backlight 273, the backlight driving circuit 274, the display system power supply 275, etc. The transparent touch panel 21 is abutted on the front surface of the display screen 271, and the backlight 273 is also close to the display screen. The main circuit 280 has a host power supply 281, etc. The touch signal detecting circuit 260 of the touch circuit 240 selects the electrode line 22i in the column electrode group 22 as a detecting electrode, and allows the electrode line 22i to pass the touch signal form number A0101. The sampling component 2611 is in communication with the output end 251 of the touch excitation source 250, and the buffers 2612 and 261 3 of the touch signal detecting circuit 260 are connected to the touch signal sampling component 2611. At both ends, the signal tiger wave 2614 is connected to the buffers 2612 and 2613, the differential amplifier circuit 2615 is connected to the signal filter 2614; the electrode lines 2 2 i -1 and 2 2 i +1 in the column electrode group 2 2 0 are both touched The output terminal 252 of the control excitation source 2 5 连通 is connected to the 'reflow electrode as the touch signal; the coupling capacitance ci-i between the electrode line 22i and the electrode line 22ί-1, and the coupling capacitance Ci between the electrode line 22i + l + Ι 'Forming touch The closed touch loop of the signal; all the row electrode rows of the column electrode group 220 and all the row electrodes of the row electrode group 230 are connected to the output terminal 2 51 of the touch sway source 25A. The host power supply 2 The display system power supply 275 is connected to the display system, and the display system power supply 275 is connected to the display drive circuit 272 and the backlight drive circuit 274. The display drive circuit 272 and the backlight drive circuit 274 are connected to the display screen 271 and the backlight 273, respectively. The power supply end of the touch control circuit 250 and the power supply end of the touch signal detection circuit 260 are connected to the host power supply 281 through two inductance elements 241 and 242; the data processing and timing controller 263 of the touch signal detection circuit 260 The data sampling channel 262 is connected to the signal sampling channel 262. The touch signal sampling component 2611 of the signal detecting channel 261 is connected between the touch excitation source 250 and the electrode line of the touch panel 21A. The signal detecting channel 261 is connected. The internal differential amplifier circuit 2615 is connected to the buffers 2612 and 2613 via the signal filter 2613, and the buffer 2612 is connected to the end of the touch signal sampling component 2611 connected to the electrode line of the touch panel 210. The buffer 2613 is connected to the touch signal sampling component 2611. The endpoint of the touch excitation source 250 is connected; the data processing and timing controller 263 is simultaneously coupled to the host circuit 280. 099102312 Form Dock Number Α 0101 Page 24 / Total 66 Page 0993184754-0 201126402 [0067] When the human finger 290 approaches or contacts the column electrode line 22i, since the finger 290 has a certain width, it also touches the column electrode line. The column electrode line 22i + l, the dielectric constant of the human body is much larger than the dielectric constant of the air, so that the capacitance of the coupling capacitors Ci-Ι and Ci + i is increased, the capacitive reactance is reduced, and the current phase of the touch signal on the touch loop is Great strain. By detecting the change in the touch signal current flowing through the touch signal sampling element 2611, the touched electric line can be found. Ο Ο Since the touch panel 210 is in close proximity to the display screen 271, a coupling capacitance CTD exists between each electrode line on the touch panel 21A and the electrode of the display screen 271. The touch excitation source 205 passes the touch signal on the electrode line of the touch panel 210, and flows into the electrode of the display screen 271 through the coupling capacitor CTD, flows into the display system power supply 275, flows into the host power supply 281, and then from the host power supply. 281/The tendency of the touch-activated excitation source 250 is jeopardized; however, since the inductance elements 241 and 242' are disposed on the connection line between the touch control circuit and the host power supply 281, the higher-frequency touch signals cannot pass smoothly; the touch signals are in contact The control loop source 250, the touch panel 210 electrode line and the display screen 271 can not obtain a smooth loop, which reduces the touch signal between the touch system and the display system to avoid the light between the touch screen and the display screen. The combined capacitance interferes with the touch detection; at the same time, the signal chopper 2614 in the signal detection channel 261 also blocks the passage of other non-ΙΟΟΚΗζ interference signals, further reducing the influence of the interference signal on the touch detection. The touch signal sampling component 2611 of the signal detecting channel 261 is connected between the touch excitation source 250 and the electrode line of the touch panel 210, and the differential amplifying circuit 2615 in the signal detecting channel 261 is connected and buffered by the signal filter 2614. The buffers are connected to the touch signal sampling component 099102312. The control signal sampling component 2611 is connected to the end of the touch excitation source 25A. The end of the touch signal sampling component 2611 connected to the touch excitation source 250 is a signal measurement reference point of the signal detection channel 2 61, and the signal measurement reference point can also be selected at other positions, that is, the buffer 2613 can be connected as a touch. The ground terminal of the control circuit 240, or the ground terminal of the host circuit, or one of the dedicated comparison circuits, to obtain a better measurement effect. [0069] Specific Embodiment 4 [0070] As shown in FIG. The application of the capacitive touch screen is shown in FIG. 3, which includes a transparent touch panel 310, a touch circuit 340, a display system, a host circuit 380, etc. The touch panel 310 is provided with two sets of insulation layers. Column electrode groups 320 (row electrode lines 321, 322, ..., 32i-1, 321 , 32l + 1.....32m) and row electrode groups 330 (having row electrode lines 331, 332, ...) , the touch circuit 340 has a touch excitation source 350 and a touch climbing detection: the circuit 360. The output of the touch excitation source 350 is 351 and 352 'The touch signal frequency of the touch excitation source 350 is selected at 4 〇〇 KHz; the output cooker of the touch excitation source 350 There is a gate filter 353 for the 400KHz frequency signal; the touch signal detection circuit 360 is composed of a signal detection channel 361, a data sampling channel 362, a data processing and timing controller 363; the signal detection channel 361 has a touch signal sampling component 3611. The buffers 3612 and 3613, the differential amplifying circuit 3614, and the like; the data sampling channel 362 has an analog-to-digital conversion circuit; the data processing and timing control circuit 363 is a central processing unit (CPU, MCU) having a data computing capability and a data output input interface. The central processing unit has a control software and a data processing software. The display system has a display screen 371, display 099102312, form number A0101, page 26/66, 0993184754-0, 201126402, drive circuit 372, backlight 373, backlight drive circuit 374, and display system. The power source 375, etc. The transparent touch panel 310 abuts the display screen 371. The moon light source 373 also abuts the back surface of the display screen 371. The host circuit 380 has a host power source 381, etc. [0071] Touch signal detection by the touch circuit 340 The circuit 36 selects the electrode line in the column electrode group 32〇- as the detecting electrode, and allows the electrode line 32i to pass the touch signal. The sampling component 3611 is in communication with the output end 351 of the touch excitation source 350. The other circuits of the touch signal detecting circuit 360 are connected to both ends of the touch signal sampling component 361 i ;; the electrode wires 32i-1 in the column electrode group 320 are 32i + l is connected to the output end 352 of the touch excitation source 350 via the gate filter 353 as a return electrode of the touch signal; and then through the coupling capacitance Ci-Ι between the electrode line 32i and the electrode line 32i-1, The coupling capacitance Ci + l ' between the electrode lines 32i + i forms a closed touch loop of the touch signal; all the remaining column lines of the column electrode group 320 and all the row electrode lines of the row electrode group 330 are directly connected to the touch The output terminal 351 of the excitation source 350 is connected to the display system power supply 375 of the display system. The host power supply 381 is connected through two inductance elements 376 and 377. The display system power supply 37S is connected to the display driving circuit 372 and the backlight driving circuit 374. The display driving circuit 372 The display screen 371 and the backlight 373 are connected to the backlight turbulence circuit 374, respectively. The host power supply 381 is connected to the power supply end of the touch excitation circuit 35 触控 and the power supply end of the touch signal detection circuit 360; the data processing and timing controller 363 of the touch signal detection circuit 36 连接 is connected to the data sampling channel π The data sampling channel 362 is connected to the signal detecting channel 361; the differential detecting circuit 3614 in the signal detecting channel is connected to the buffers 3612 and 3613, the buffers 3612 and 3613 are connected to both ends of the touch signal sampling component 3611, and the signal detecting channel 361 is touched to the 099102312 form. No. A0101 Page 27 of 66 0993184754-0 201126402 Control signal sampling read 36Η Connect money control (4) Chat and touchpad 3 ι〇 between the electrode line 'data processing and timing control H 363 simultaneously connected to the host circuit 380. [0073] Although the human finger 390 is close to or in contact with the column electrode milk, since the finger 390 has a <width>, it also touches the column electrode line YANG-1 and the column electrode line 32i + the human body dielectric. The coefficient is much larger than the dielectric constant of the air, so that the capacitance of the capacitive capacitors CH and ClH is increased, and the capacitive reactance reduces the current of the touch money on the touch loop correspondingly. By detecting the change in the touch signal current flowing through the touch signal sampling element 3611, the touched electric line can be found. _ Since the touch panel 310 is abutted on the display screen 371, the electrode lines on the touch panel 3 〇 also read the residual capacitance ctd between the electrodes of the screen 37:1. The touch signal outputted by the touch excitation source 350 to the electrode line of the touch panel 31 has a function of flowing into the display screen 371 through the coupling capacitor CTD, flowing into the display system power supply 375, flowing into the host power supply 381, and then flowing from the host power supply 381. The tendency to switch back to the excitation source 350; however, since the inductance elements 376 and 3 are disposed on the connection line between the display system power supply 375 and the host power supply 331, the touch signals of the south frequency cannot pass smoothly; the touch signals are in touch. The smooth circuit is not obtained between the excitation source 350, the touch panel 310 electrode line and the display screen 371, thereby preventing the touch signal from flowing between the touch system and the display system, and avoiding the coupling capacitance between the touch screen and the display screen. The touch detection generates interference; at the same time, the gate filter 353 in the touch loop also blocks other non-400KHz interference signals, further reducing the influence of the interference signal on the touch detection. 099102312 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Five Form No. A0101 Page 28 / Total 66 Page 0993184754-0 [0074] 201126402 [0075] The palm-type application product of the capacitive touch screen as shown in FIG. 4, includes transparent The touch panel 41, the touch circuit 44, the display system, the host circuit 480, the outer casing 490, etc. The touch panel 41 is provided with two sets of mutually orthogonal column electrode groups 42 spaced apart by an insulating layer ( There are column electrode lines 421, 422 ..... 42i-1, 42i, 42i + l.....42m) and row electrode group 430 (with row electrode lines 431, 432 ..... 43j-Ι, The touch circuit 440 has a touch excitation source 450 and a touch signal detection circuit 460. The touch signal frequency of the touch excitation source 450 is selected at or above; the touch signal is selected. The detection circuit 460 is composed of a signal detection channel 461, a data sampling channel 462, a data processing and timing controller 463; the signal detection channel 461 has a touch signal sampling component 4611, buffers 4612 and 4613, a differential amplification circuit 4614, etc.; The sampling channel 462 has an analog to digital conversion circuit; the data processing and timing control circuit 463 is A central processing unit (CPU, MCU) having a data computing capability and a data output input interface, the central processing unit has a control software and a data processing software. The display system has a display screen 471, a display driving circuit 472, a backlight 473, and a backlight driving circuit. 474 and display system power supply 475, etc. The transparent touch panel 410 abuts the front surface of the display screen 471, and the backlight 473 also abuts the back surface of the display screen 471. The host circuit 480 has a main power source 481, etc. The outer casing 490 is provided with The electrode power supply 481 is connected to the display system power supply 475 of the display system 470. The display system power supply 475 is connected to the display driving circuit 472 and the backlight driving circuit 474. The display driving circuit 472 and the backlight driving circuit 474 are respectively connected to the display screen 471. And the backlight 473. The touch circuit 440 touches the power supply end of the excitation source 450 and the power supply end of the touch signal detection circuit 460 through two inductors 099102312 Form No. A0101 Page 29/66 pages 0993184754-0 201126402 I, 41 and 442 is connected to the host power supply 481. The touch signal detecting circuit 460 is processed by the material processing and the timing controller 463 is connected to the data sampling channel.彳62, the data sampling channel 462 is connected to the signal detecting channel 461, the signal detecting channel, the differential amplifying circuit 4614 in the 461 is connected to the buffer such as 2 and 3, and the buffering benefits 4612 and 4613 are connected to the two ends of the touch signal sampling component 彳(1) The signal detection channel, such as the control device element 4611, is connected between the touch excitation source 450 and the electrode line of the touch panel 410; the data processing and timing controller 463 is simultaneously connected to the host circuit "o. [0077] The touch signal detecting circuit of the touch circuit 440 selects the electrode line 42 in the 电极4 electrode group 42 !! The detecting electrode ‘the electrode line is similar to the touch signal sampling τ ο 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 461 The output end 451 is connected, and the other electrodes of the touch signal detecting circuit are connected to both ends of the sub-recording element 4611; all the remaining column electrode lines of the column electrode group 420 and all the row electrode lines of the row electrode group 4 3 0 are Directly connected to the output end 451 of the touch excitation source 4 5 ;; the p-electrode 491 on the outer casing 490 serves as a return electrode of the touch signal, and the electrode 491 is connected to the output end 452 of the touch excitation source 45A: when When the finger 4100 approaches or contacts the column electrode line 42i, a coupling capacitor Ci is generated between the finger 41 00 and the column electrode line 42i, and the touch excitation signal outputted by the touch excitation source 450 to the column electrode line 42 i passes through the coupling capacitor. Ci flows into the finger, and then flows into the return electrode 491 on the outer casing of the product through the palm of the holding product, and then flows back from the return electrode 491 back to the touch excitation source 450. The touch excitation source, the touch panel electrode line, the finger and the electrode Coupling capacitance between wires, A return electrode on the housing composed of the touch circuit. The detected electrode line can be found by detecting the change of the touch signal current flowing through the touch signal sampling element 4611. 099102312 Form No. A0101 Page 30 of 66 0993184754-0 201126402 [0078]

G

[0079] [0079]

[0081] Since the touch panel 410 is in close proximity to the display screen 471, a coupling capacitance CTD exists between each electrode line on the touch panel 410 and the electrode of the display screen 471. The touch excitation signal 450 outputs the touch signal to the electrode line of the touch panel 410, and flows into the display screen 471 electrode through the _combined capacitance CTD, then flows into the display system power supply 407, and then flows into the host power supply 4 81, and then from the host. The tendency of the power source 481 to flow back to the touch excitation source 450; however, since the inductance elements 441 and 442 are disposed on the connection line between the touch circuit 440 and the host power source 481, the higher frequency touch signals cannot pass smoothly; the touch signals are The smooth circuit between the touch excitation source 450, the touch panel 410 electrode line and the display screen 471 can prevent the touch signal from flowing between the touch system and the display system, and avoid coupling between the touch screen and the display screen. Capacitance interferes with touch detection. When the surface of the touch panel 410 is filled with water droplets, the water droplets on the surface of the touch panel 410 do not cause the connection between the touch panel electrode lines and the electrodes 491 on the outer casing 490, so that the touch panel electrode lines and contacts cannot be formed. A touch signal loop on the surface of the control board, the outer casing electrode, and the touch excitation source. Only when the touch panel of the operator holding the application product touches the touch panel, the touch excitation source, the touch panel electrode line, the coupling capacitance between the finger and the electrode line, and the touch electrode on the outer casing form a touch. Signal loop. The water droplets on the surface of the touch panel 410 will not affect the judgment of the touch circuit on the touch signal. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A touch panel display 500 as shown in FIG. 5 includes a display screen 510, a display driving circuit 540, a touch circuit 550, and a display/touch signal strobe circuit 560. The display screen 510 is provided with two sets of mutually orthogonal column electrode groups 520 spaced apart by an insulating layer (the column electrode lines 521, 522 ..... 099102312 Form No. A0101 Page 31 / Total 66 pages 0993184754-0 201126402 52i-l, 52i, 52i+l, •··, 52m) and row electrode group 530 (with row electrode lines 531, 532, . . . , 53j-1, 53j, 53j + l, ..., 53n) The control circuit 550 has a touch excitation source 57A and a touch signal detection circuit 580. The touch signal detecting circuit 58 is composed of a signal detecting channel 581, a data sampling channel 582, a data processing and timing controller 583. The signal detecting channel 581 has a touch signal sampling component 5811, buffers 5812 and 5813, and a differential amplifying circuit 5814. Etc.: The data sampling channel 582 has an analog-to-digital conversion circuit; the data processing and timing control circuit 583 is a central processing unit (cpu, MCU) having a data computing capability and a data output input interface, and the central processing unit has a control software and a data processing software. The display driving circuit 540 and the touch circuit 550 are connected to the display screen 510 through the display/touch signal strobe circuit 56; the display/touch signal strobe circuit 56 〇 or the display driving circuit 540 is connected to the display screen 510, or The touch circuit 550 is connected to the display screen 510. During the display period, the display/touch signal gating circuit 560 causes the display driving circuit 540 to communicate with the display screen 510 to transmit a display driving signal to the display screen 510, and the display screen 510 is in a display state. During the detection period, the display/touch signal strobe circuit 560 causes the touch circuit 550 to communicate with the display screen 510 to transmit a touch signal to the display screen 510, indicating that the screen 510 is in the touch detection state. At some time in the detection period, the touch signal detecting circuit 580 of the touch circuit 550 selects the electrode line 52i in the column electrode group 520 as the detecting electrode 'to pass the electrode line 52i through the touch signal sampling element 5811 and the touch excitation source. The output terminal 571 of the 570 is connected to the other circuits of the touch signal detecting circuit 580 to be connected to both ends of the touch signal sampling element 5811; the electrode lines 52i-l and 52i + l 099102312 in the column electrode group 520 are shown in Form No. A0101. A total of 66 pages 0993184754-0 201126402 ❹ are all connected with the output end 572 of the touch excitation source 570 as a return electrode of the touch signal; and then through the coupling capacitance Ci-Ι between the electrode line 52i and the electrode line 52i-1, The coupling capacitance Ci + Ι between the electrode lines 52i + l forms a closed touch loop of the touch signal; all the remaining column lines of the column electrode group 520 and all the row electrode lines of the row electrode group 530 are also touched The output 571 of the excitation source 570 is in communication. The touch signal flowing out from the touch excitation source output terminal 571 flows into the column electrode line 52i via the touch signal sampling component 5811, and flows into the electrode line 52i via the coupling capacitance Ci-Ι between the electrode line 52i and the electrode line 52i-1. l. The capacitive capacitance Ci + Ι between the electrode line 52i and the electrode line 52i + l flows into the electrode line 52i + l, and then flows back from the electrode lines 52i-1 and 52i + 1 to the touch excitation source output terminal 572. The flow of signals on a closed touch loop. [0084] When the finger of the person as the touch object 590 approaches or contacts the column electrode line 52i, since the finger has a certain width, the column electrode line 52i-1 and the column electrode line 52i+1 are also touched. The dielectric constant is much larger than the dielectric constant of the air, so that the capacitance of the coupling capacitors Ci-Ι and Ci + 增大 increases the capacitive reactance, and the current of the touch signal on the touch loop becomes correspondingly larger. When the finger approaches or contacts the positions of the other column electrode lines of the non-52i, 52i-1, and 52i+1, the coupling capacitance between the column electrode lines, the column electrode lines, and the row electrode lines also changes. However, since the output end of the touch excitation source 570 connected to each electrode is the same output end 571 at the touched position, the change of the touch signal current flowing through the touch signal sampling element 5811 is very small. The touch circuit 550 sequentially connects the electrode lines of the display screen 510 to the output of the touch excitation source 5 70 through the touch signal sampling component 5811 in a scanning manner. Form number A0101 Page 33 / Total 66 pages 0993184754-0 [0085] The terminal 571 of the 201126402 is connected to the output end 572 of the touch excitation source 570 at the same time, so that all the remaining electrode lines are also connected to the output end 5 71 of the touch excitation source 507. The control signal detecting circuit 580 detects the change of the touch signal current flowing through the touch signal sampling component 5811, and finds that the touch electrode line whose touch current current changes the most and exceeds a certain threshold is the touched electrode line; The intersection position of the contact electrode line in the electrode group 520 and the touched electrode line in the row electrode group 530 is the touch position of the finger. [0086] The condition of the touched electrode line is determined, and only the electrode line whose detected touch signal variation exceeds a certain threshold value is detected as the touched electrode line, so that the touch panel display 500 allows multiple points at the same time. Touch. [0087] Since the touch signal flows on the closed loop formed between the touch circuit 550 and the different touch electrode lines on the display screen 510, the touch object 590 has a non-metal having a different dielectric constant and air dielectric coefficient. When the object approaches or touches the display screen 51 0, it can also change the coupling capacitances Ci-Ι and Ci + Ι between the adjacent touch electrode lines, causing the change of the touch signal current on the touch circuit, and letting the non-metallic touch object ( For example, a conventional stylus can also be used to operate the touch panel display 500. When the touch object 580 approaches or contacts the display screen 510 with a metal object, the metal object changes the effective coupling distance between adjacent touch electrode lines. Thereby changing the coupling capacitances Ci-Ι and Ci+Ι between the touch electrode lines, causing changes in the touch signal current on the loop, so that the metal touch object (such as a metal stylus) can also be used to operate the touch panel. Display 500. [0088] Embodiment 7 [0089] As shown in FIG. 6, a palm-type application product 600 equipped with a touch panel display, including a display screen 610, a display driving circuit 640, and a touch control 099102312, form number A0101, 34 Page / A total of 66 pages 0993184754-0 201126402 Ο Road 5 〇 display / 鹎趁 signal strobe circuit 660, host circuit 67 〇 and outer casing 680 and so on. There are two sets of mutually orthogonal column electrode groups 620 spaced apart by an insulating layer (there are column electrode lines, 622...62i~l. 62i^β〇·i + i, on the display μ~ 骛6 Η) ..., 62m) and row electrode group 630 (having row electrode lines 631, 632, ..., 63, 1, 63j, 63j + ], ..., 63n). The touch circuit 65G has a touch source 651 and a touch signal detecting circuit. The amp's touch signal detecting circuit 652 has a touch signal sampling component (4), and the host circuit 670 has a host power source 671 and the like. The power supply end of the touch housing 650 touch excitation source (8) and the power supply end of the touch mark detection circuit 652 are connected to the host power supply 671 through two inductance elements 653 and 654. The display driving circuit 640 and the touch control circuit 650 are connected to the display screen (4) through the display/touch signal strobe circuit _; the display/touch signal strobe circuit 660 or the display rotation circuit _ is connected to the display glory 61, Or the touch circuit 65A is connected to the display screen 61. [0090]

[0091] During the display period, the display/touch signal gating circuit 66() causes the display driving frequency 0 to communicate with the display screen 610 to transmit a display driving signal to the display screen 6U), and the display screen 610 is displayed as a display bear. During the detection period, the display/touch signal gating circuit 66Q causes the touch circuit 65A to communicate with the display screen 610 to transmit a touch signal to the display screen 61, indicating that the honor screen 610 is in the touch detection state. At some time in the detecting period, the touch signal detecting circuit 652 of the touch circuit 640 selects the electrode line 62i in the column electrode group 62 as the detecting electrode, and causes the electrode line 62i to pass the touch signal sampling element 6521 and the touch excitation. The output end 6511 of the source 651 is connected, and other circuits of the touch signal detecting circuit 652 are connected to both ends of the touch signal sampling element 6521; all remaining column electrode lines in the column electrode group 62() and 099102312 Form No. A0101 page 35 / Total 66 pages 0993184754-0 201126402 All the row electrode lines of the row electrode group 6 3 0 are also in communication with the output end 6511 of the touch excitation source 615; the electrode 681 on the outer casing 680 serves as the return electrode of the touch signal. The electrode 681 is connected to the output end 6512 of the touch excitation source 651; when the human finger 690 approaches or contacts the column electrode line 62i, a coupling capacitance Ci is generated between the finger 690 and the column electrode line 62i, and the touch excitation source 61 outputs The touch excitation signal on the column electrode line 6 2 i flows into the finger through the capacitor CU, and then flows into the return electrode 681 on the outer casing of the product through the palm of the holding product, and then flows back from the return electrode 681. The touch excitation source 651; by the touch excitation source, reflux coupling capacitance between the electrodes on the touchpad electrode lines, and the finger electrode line, a touch circuit composed of the outer casing. The detected electrode line can be found by detecting a change in the touch signal current flowing through the touch signal sampling element 6521. When the surface of the display screen 610 is covered with water droplets, the water droplets on the surface of the display screen 610 do not cause the connection between the display screen electrode line and the electrode 681 on the product outer casing 680, so that the display screen electrode line and the display screen cannot be formed. Surface water droplets, outer casing electrodes, touch signal loops for touch excitation sources. Only when the touch panel of the operator holding the application product touches the touch panel, the touch excitation source, the touch panel electrode line, the coupling capacitance between the finger and the electrode line, and the touch electrode on the outer casing form a touch. Signal loop. Displaying the water droplets on the surface of the screen 610 will not affect the judgment of the touch circuit on the touch signal. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0094] The application product 700 of the capacitive touch screen as shown in FIG. 7 includes a touch control electrode group 710, a touch control circuit 720, a display system, a host circuit 760, and the like. The display system has a display screen 751, a display driving circuit 752, a back 099102312, a form number A0101, a 36th page, a total of 66 pages, 0993184754-0, 201126402, a light source 753, a backlight driving circuit 754, and a display system power supply 755, etc. The back of the honor curtain 751. The host circuit has a host power supply 761 and the like. On the upper surface of the substrate on the display screen 751, a set of mutually distorted polygonal electrode groups 71 are provided (the line electrodes 7U, 712, ..., 71i-1, 71i, 71i + l..... 71m), the lead ends of the electrode lines are all located in the same direction of the electrode group 710, and the electrode lines are made of a transparent material having a certain resistance value. The touch circuit 72A has a touch excitation source 730 and a touch signal detection circuit 74A. The output of the touch excitation 0 source 730 is 732, the touch signal frequency of the touch excitation source 730 is selected at 400 kHz, and the output 埠 732 of the touch excitation source 730 has a strobe chopper 733 for the 400 kHz frequency signal; The touch signal detection circuit 740 is composed of a signal detection channel 741, a data acquisition channel 742, a data processing and timing controller 743. The signal detection channel mi has a touch signal sampling component 741, buffers 7412 and 7413, and a signal filter. 7414, differential amplifier circuit 7415, etc.; data sampling channel 742 has analog to digital conversion circuit; data processing and timing control circuit? 43 is the central processing unit (CPU, MCU) with data processing, data output interface, and central processing unit with control software and data processing software. The touch signal detecting circuit 74 of the touch circuit 720 selects the electrode line 71i of the electrode group 71A as the detecting electrode, and the electrode line m passes through the touch signal sampling element 7411 and the output end 731 of the touch excitation source 730. Connected, the electrode line 71i_b7mup in the electrode group 7U) is connected to the output end 732 of the touch excitation source 73A as a return electrode of the touch signal; and the electrode capacitance and the electrode line are formed through the electrode line 71i and the electrode line. 7Η + 1 fit capacitor Ci + 1, form a closed touch loop for touch signals; let 099102312 form number A0101 page 37 / total page 66 0993184754-0 201126402 all the remaining electrode lines in electrode group 710 are also The output end 731 of the touch excitation source mo is in communication. The host power supply 761 is connected to the display system power supply 755 of the display system. The display system power supply 755 is connected to the display drive circuit 752 and the backlight drive circuit 754. The display drive circuit 752 and the backlight drive circuit 754 are connected to the display screen 751 and the backlight 753, respectively. The touch control circuit 72 is connected to the power supply end of the touch excitation source 730 and the power supply end of the touch signal detection circuit 74, and is connected to the host power supply 761 through two signal isolation devices 721 and 722 that can not smoothly pass the 400KHZ touch signal; The data processing and timing controller 743 of the signal detecting circuit 74 is connected to the data sampling channel 742. The data sampling channel 742 is connected to the 检测 detecting channel 741. The touch signal sampling component 7411 of the signal detecting channel 741 is connected to the touch excitation source 73. The differential amplifier circuit 7415 in the signal detecting channel 741 is connected to the buffer 7412 and the buffer 7413 via the signal filter 7414. The buffer 7412 is connected to the touch signal sampling component 7411. The end of the electrode line of the control electrode group 710, the buffer 7413 is connected to the end point of the touch signal sampling component 7411 connected to the touch excitation source 73〇; the data processing and timing controller 7 4: when connected to the main plant: Hey. [0096] When the finger 770 of the person approaches or contacts the electrode line 7U, since the finger 77 has a predetermined width and also touches the electrode line 71i] and the electrode line 71H1, the dielectric strength of the human body is greater than that of the air. The electric coefficient causes the capacitance of the combined capacitances Ci-1 and Ci+1 to increase the capacitive reactance, and the current of the touch signal on the touch loop becomes correspondingly larger. Since the leading end of the detecting electrode and the return electrode are located in the direction of the touch electrode group, the electrode line has a certain resistance value. When the finger touches different positions of the electrode line, the line resistance of the electrode line segment from the touch excitation source to the touch point is The value is different. Touch 099102312 Form No. A0101 Page 38/66 Page 0993184754-0 201126402 The resistance value on the loop is different. The current of the touch signal changes with the position of the finger 77〇 on the touched electrode line. The touch circuit 720 selects the electrode lines of the electrode group 710 as detection electrodes one by one in a scanning manner, and determines the size of the touched electrodes by comparing the magnitudes of the touch signals on different electrode lines to change the size of the touch signals on the electrodes. Position the touch point on the touched electrode.触控 Ο Since the touch electrode group 710 is located on the upper substrate of the display screen 751, the electrode lines of the touch electrode group 710 and the electrodes of the display screen 751 also have a surface voltage CTD. The touch excitation source 730 outputs the touch screen to the touch electrode line, which has the function of flowing into the display screen 751 electrode through the coupling capacitor CTD, re-flowing the display system power supply 755, flowing into the host power supply 761, and then flowing from the host electric vibration 7 61 . The tendency of the touch excitation source 73 to be turned back; however, since the host power supply 761 is connected to the power supply end of the touch excitation source 730 and the power supply end of the touch signal detection circuit 740 through the §fl isolation devices 721 and 722, The frequency of the touch signal cannot pass smoothly through the 'touch signal' in the touch excitation source 73〇, the touch electrode group 710 electrode line, the display screen 751, the display system power source 755, and the host power source 7 61. The touch signal is prevented from being streamed between the touch system and the display system, and the coupling capacitance between the touch screen and the display screen is prevented from interfering with the touch detection; at the same time, the gate filter 733 in the touch loop is also blocked. The interference signal of other non-4〇〇κΗζ passes, which further reduces the influence of the interference signal on the touch detection. The signal filter 7414 in the touch signal detection circuit 740 also makes the non-400KHz Signal interference can not affect the results of the touch detection. When there are multiple touch points, the touch points of different electrode lines can be distinguished by comparing the size of the touch signals on different electrode lines in the adjacent area. 099102312 Form No. A0101 Page 39 / Total 66 Page 0993184754-0 [ 0098] 201126402: Different touch points on the same electrode line are distinguished by the order in which the touch points touch the time; when there are two touch points moving in the direction of the electrode group 710, due to the inside of the electrode group 710 The electrode line is a fold line. The movement of the touch point in any direction will pass through different electrode lines at different times, so that we can judge the position and moving direction of the touch point. [0099] Embodiment 9 [0100] A palm-type application product 800 of a capacitive touch screen as shown in FIG. 8 includes a transparent touch panel 810, a touch circuit 830, a display system, a host circuit 870, and an outer casing. 880 and so on. The display system has a display screen 861, a display drive circuit 862, a backlight 863, a backlight drive circuit 864, a display system power supply 865, and the like. The transparent touchpad 810 abuts the display screen 861, and the backlight 863 abuts the back of the display screen 861. The host circuit 870 has a host power source 871 and the like. An electrode 881 is disposed on the outer casing 880. [0101] A transparent planar electrode 811 is disposed on a surface of the touch panel 810 facing the display screen 861; a set of folded-line electrode groups 820 (having a polygonal line) are disposed on the surface of the touch panel 810 facing the user. Electrode lines 821, 822, ..., 82i_1 '82i, 82i + l, ..., 82m) 'The adjacent electrode lines have lead terminals in different directions, and the electrode lines are made of ITO transparent material having a certain resistance value. The touch circuit 830 has a touch excitation source 840 and a touch signal detection circuit 850. The output of the touch excitation source 840 is 841 and 842, and the touch signal frequency of the touch excitation source 840 is selected at 400 KHz. The touch signal detection circuit 850 is composed of signal detection channels 851 and 852, data sampling channels 853 and 854, and data. Processing and timing controller 855; signal detection channel 851 has touch signal sampling component 8511, buffers 851 2 and 8513, signal filter 8514, differential amplifier circuit 851 5, etc. 099102312 Form No. A0101 Page 40 / 66 page 0993184754 -0 201126402; signal detection channel 852 has touch signal sampling component (10), buffers 8522 and 8523, signal chopper 8524, differential amplifier circuit (10) "etc.; data sampling channel 853 has analog to digital conversion circuit, data sampling channel The 854 has an analog-to-digital conversion circuit; the data processing and timing control circuit milk is a central processing unit (CPU, MCU) with data computing capability and data output input interface. 'The central processing unit has control software and data processing software〇[0102] Ο Ο The touch signal detecting circuit 85 of the touch circuit 830 simultaneously selects the electrode line 82i-1 and the electrode line 82i in the electrode group 820 as detection electrodes, so that The pole line 82 i-Ι communicates with the output end 841 of the touch excitation source 840 through the touch signal sampling element 85π through the touch signal sampling element 85π, and the electrode line 82i also communicates with the output end 841 of the touch excitation source 840 through the touch signal sampling element 8512. The remaining electrode lines in the electrode group 820 are directly connected to the output end 841 of the touch excitation source 84A; the electrode 881 on the outer casing 880 is used as the return electrode of the touch signal, and the electrode 881 and the touch excitation source 84 are disposed. The output 842 is connected. The host power supply 8 71 is connected to the display system power supply 865 of the display system, and the display system power supply 865 is connected to the display driving circuit 862 and the backlight driving circuit 864. The display driving circuit 862 and the backlight driving circuit 864 are respectively connected to the display screen 861 and the backlight. 863. The power supply end of the touch control circuit 830 and the power supply end of the touch signal detecting circuit 85 are connected to the host power supply 871 through two signal isolation devices 831 and 832 that prevent the 400KHz touch signal from passing smoothly. The touch signal detecting component 8511 of the touch signal detecting circuit 850 is connected between the touch excitation source 84 and the electrode line 821-1 of the touch electrode group 82. The buffer 8512 is connected to the touch signal sampling. Component 099102312 Form No. A0101 Page 41 / Total 66 Page 0993184754-0 [0103] 201126402 8511 Connect the electrode line "end point of the dice, the buffer 8513 is connected to the end of the touch signal sampling element 8511 connected to the touch excitation source 840 The input end of the differential amplifying circuit 8515 in the signal detecting channel 851 is connected to the buffers 8512 and 8513 through the signal filter 8514, and the output end of the differential amplifying circuit 8515 is connected to the input end of the data sampling channel 853; the touch signal sampling of the signal detecting channel 852 The component 8521 is connected between the touch excitation source 84A and the electrode line 82i of the touch electrode group 820. The buffer 8522 is connected to the end of the touch signal sampling component 8521 connecting the electrode line 82i, and the buffer 8523 is connected to the touch signal. The sampling component 8521 is connected to the end of the touch excitation source 840, and the input end of the surface amplification circuit 8525 in the signal detection channel 852 is connected to the buffer 8522 through the signal filter 8524. And 8523, the output end of the differential amplifying circuit 8525 is connected to the input end of the data sampling channel 854; the output ends of the data sampling channels 853 and 854 are respectively connected to two different data processing and timing controllers 855; data processing and timing controller 853 At the same time, the host circuit 870 is connected. [0104] When the human finger 890 approaches or contacts the electrode lines 82 and 1 and 82i, a coupling capacitor is generated between the finger 890 and the electrode line 82i-1, and the touch excitation source 840 outputs The touch excitation signal on the electrode line 82i-1 flows into the finger through the coupling capacitor Ci-Ι, and then flows into the return electrode 881 on the outer casing of the product through the palm of the holding product, and then flows back from the return electrode 881. The excitation source 840 is controlled; a coupling capacitor Ci is generated between the finger 890 and the electrode line 82i, and the touch excitation signal outputted from the touch excitation source 840 to the electrode line 82i flows into the finger through the coupling capacitor Ci, and then the product is held by the holding device. The palm of the hand flows into the return electrode 881 on the outer casing of the product, and then flows back from the return electrode 881 back to the touch excitation source 840. The touch source and the touchpad electrode 099102312 Form No. A0101 Page 42/ A total of 66 pages 0993184754-0 201126402 The coupling capacitance between the line, the finger and the electrode line, and the return electrode on the outer casing constitute a touch loop. [0105] Ο By detecting the touch signal current flowing through the touch signal sampling elements 8511 and 8512 The change can be found to the touched electrode line. Since the electrode lines 82i-Ι and 82i have the lead ends in different directions, the electrode lines have a certain resistance value, and when the fingers touch different positions of the electrode lines 82i-Ι and 82i, When the line resistance value of the touch excitation source output to the touch line on the electrode line 82i-1 is large, the line resistance value from the touch excitation source output 埠 to the touch point on the electrode line 82i is small, and the electrode line 82 is 1 and 82i. The ratio of the current of the touch signal varies with the position of the finger 890 on the touched electrode line. The touch circuit 830 sequentially selects the pair of electrode lines of the electrode group 820 as the detecting electrodes in a scanning manner, and determines the touched electrodes by comparing the sizes of the touch signals on the different electrode lines to flow through the touch signals on the pair of touched electrodes. The ratio locates the position of the touch point on the touched electrode. [0106] Although the touch panel 810 is in close proximity to the display screen 861, since the touch panel 810 has a planar electrode 811 on the surface facing the display screen 861, the planar electrode 811 is connected to the ground end of the host power supply 871, and is blocked. The touch signal is streamed between the touch system and the display system to prevent the coupling capacitance between the touch screen and the display screen from interfering with the touch detection. Meanwhile, the signal filters 8514 and 8524 in the touch signal detection circuit 850 are also Let non-400KHz interference signals not affect the effect of touch detection. [0107] When there are multiple touch points, the touch points of different electrode lines can be distinguished by comparing the sizes of the touch signals on different electrode lines in the adjacent areas; for different touch points on the same electrode line, Each touch point touches the order of time to distinguish; when there are two touch points in the direction of electrode group 099102312 Form No. A0101 Page 43 / Total 66 Page 0993184754-0 201126402 820, due to the inside of the electrode group 820 The electrode line is a fold line. The movement of the touch point in any direction will pass through different electrode lines at different times, so that we can judge the position and moving direction of the touch point. The above is a further detailed description of the present invention in connection with the specific preferred embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS [0109] The first diagram, the lb diagram, the lc diagram, the Id diagram, and the diagram are the electrical connections of the first embodiment and the second embodiment of the present invention, and FIG. 2 is a schematic diagram. 3 is a schematic diagram of electrical connection according to a fourth embodiment of the present invention; FIG. 4 is a schematic diagram of electrical connection according to a fifth embodiment of the present invention. FIG. 5 is a specific implementation of the present invention. FIG. 6 is a schematic diagram of electrical connection of a seventh embodiment of the present invention; FIG. 7 is a schematic diagram of electrical connection of a specific embodiment of the present invention; and FIG. 8 is an electrical diagram of a specific embodiment of the present invention Connection diagram. [Description of main component symbols] [0110] 100: touch screen; 110: touchpad; 12 0: column electrode group; 121, 122.....12i-2, 12i-l, 12i, 12i + l, 12i+2 099102312 Form No. A0101 Page 44/66 Page 0993184754-0 201126402,...,12m :歹|J electrode line; 130: Row electrode group; 131,132.....13 j-2,13 j -Ι, 13 j, 13 j + Ι, 13 j + 2 .....13n: row electrode line; 140: touch circuit; 15 0 : touch excitation source; 151, 152: output; 160: touch Control signal detection circuit; 161: signal detection channel;

162: data sampling channel; 163: data processing and timing controller; 1611: touch signal sampling component; 1612: buffer; 1613: differential amplifier circuit; 170: touch object; 200: capacitive touch screen application product ;

210: touchpad; 220: column electrode group; 221, 222 ..... 22Ϊ-1 pole line; 230: row electrode group; 231, 232 ..... 23 j-1

, 22i, 22i + l.....22m: column, 23j, 23j+l, 23n: row electrode line; 240: touch circuit; 241, 242: inductive component; 250: touch excitation source; 099102312 Form No. A0101 Page 45 / 66 pages 0993184754-0 201126402 251, 252: output; 260: touch signal detection circuit; 261: signal detection channel; 262: data sampling channel; 263: data processing and timing controller; 2611: touch signal sampling component; 2612, 2613: buffer; 2614: signal filter; 2615: differential amplifier circuit; 271: display screen; 272: display driver circuit; 273: backlight; 2 7 4: backlight Drive circuit; 2 7 5.: display system power; 280: host circuit; 281: host power; 290: finger; 300: capacitive touch screen application; 310: touchpad; 3 2 0: column electrode group ; 321, 322 ..... 32i — 1, 32i, 32i + l.....32m : 歹 electrode line; 330 : row electrode group; 331, 332 ..... 33 j-Ι, 33 j , 33 j + 1.....33η : row electrode line; 340: touch circuit; 099102312 form number Α 0101 page 46 / total 66 page 0993184754-0 20112640 2 3 5 0 : touch excitation source; 351, 352: output; 353: filter; 360: touch signal detection circuit; 361: signal detection channel; 362: data sampling channel; 363: data processing and timing controller 3611: touch signal sampling component; 3612, 3613: buffer; 3614: differential amplifier circuit; 371: display screen; 372: display driver circuit; 373: backlight; 374: backlight driver circuit; 375: display system power 376, 377: Inductive component; 380: Host circuit; 381: Host power supply; 390: Finger; 400: Handheld application of capacitive touch screen; 410: Touchpad; 420: Column electrode group; 421, 422 ..... 42i-l, 42i, 42i + l.....42m : 歹丨J electrode line; 430: row electrode group; 431, 432 ..... 43 j-Ι, 43 j, 43 j + 1.....43η : Line power 099102312 Form number Α 0101 Page 47 / Total 66 page 0993184754-0 201126402 Polar line; 440 : Touch circuit; 441, 442: Inductive component; 4 5 0 : Touch excitation Source; 451, 452: output; 460: touch signal detection circuit; 461: signal detection channel; 462: data sampling channel; 3: data processing and timing controller; 4611: touch signal sampling component; 4612, 4613: buffer; 4614: signal filter; 470: display system; 471: display screen; 472: display driver circuit; 473: backlight Source; 474: backlight drive circuit; 4 7 5 . display system power supply, 480: host circuit; 481: host power supply; 490: outer casing; 491: electrode; 4100: finger; 500: touch panel display screen; 51 0 : display screen; 5 2 0 : column electrode group; 099102312 form number A0101 page 48 / total page 66 0993184754-0 201126402 521, 522 ..... 52i-l, 52i, 52i + l, · · · &gt; 52m : 歹, J electrode line; 530 : row electrode group; 531, 532 ..... 53 j-1, 53j, 53 j + 1.....53n :

Polar line; 540: display driver circuit; 550: touch circuit; 560: display/touch signal strobe circuit; 5 7 0: touch excitation source; 571, 572: output terminal; 580: touch signal detection circuit; 581: signal detection channel; 5811: touch signal sampling component f 5812, 5813: buffer; 5814. differential amplification circuit, 582: data sampling channel;

583: data processing and timing control 590: touch object; 600: touch-type flat display screen handheld display screen; 610: display screen; 6 2 0: column electrode group; 621 ' 622 ..... 62i- l, 62i, 62i + l.....62m column electrode line; 630: row electrode group; 631, 632 ..... 63b 1, 63 j, 63 j + 1.....63η polar line ; : Line power 099102312 Form number Α 0101 Page 49 / Total 66 page 0993184754-0 201126402 640 : Display driver circuit; 650 : Touch circuit; 651 : Touch excitation source; 6511, 6512 : Output; 652 : Touch signal Detection circuit; 6521: touch signal sampling component; 653, 654: inductance component; 670: host circuit; 671: host power supply; 680: outer casing; 681: electrode; 690: finger; 700: application of capacitive touch screen Product; 710: electrode group; 711, 712, ..., 71 i-Ι, 71 i, 71 i + 1.....71m: electrode line; 720: touch circuit; 721, 722: signal isolation device 730: touch excitation source; 731, 732: output; 733: strobe filter; 740: signal detection circuit; 741: signal detection channel; 7411: touch signal sampling component 7412, 7413: buffer; 7414: signal filter; 099102312 form number A0101 page 50 / total page 66 0993184754-0 201126402 7415: differential amplifier circuit; 742: data sampling channel; 743: data processing and timing controller; 751: display screen; 752: display drive circuit; 753: backlight; 754: backlight drive circuit; 7 5 5: display system power; 760: host circuit; 761: host power supply; 770: finger; 800: capacitive touch Control screen; 810: touchpad; 811: planar electrode; 820: electrode set; 821 '822 ..... 82i-l, 82i, 82i + l.....82m: electrode line; 830: touch Control circuit; 831, 832: signal isolation device; 840: touch excitation source; 841, 842: output; 850: touch signal detection circuit; 8 51, 8 5 2: signal detection channel; 8511, 8521: touch Signal sampling component; 8512, 8513, 8522, 8523: buffer; 8514, 8524: signal filter; 099102312 Form number A0101 Page 51 / 66 page 0993184754-0 201126402 8515, 8525: differential amplifier circuit; 853, 854: Data sampling channel; 855 ··Data processing and timing 861: display screen; 862: display drive circuit; 863: backlight; 864: backlight drive circuit; 8 6 5: display system power; 870 · · host circuit; 871: host power supply; 880: outer casing; 881: electrode; 890: finger;

Ci-1, Ci, Ci + l, CTD: Coupling capacitors. 099102312 Form Number A0101 Page 52 of 66 0993184754-0

Claims (1)

201126402 VII. Patent application scope: 1. An electric valley touch screen, comprising: a touch substrate and a touch circuit, the touch circuit has a touch excitation source and a touch signal detection circuit, the touch A touch electrode group is disposed on the substrate; when the touch substrate is provided with not less than two sets of touch electrodes, the touch electrodes are disposed on different touch substrates or are separated by an insulating layer. The touch substrate is disposed on an application product, and the application product has a display system including a display screen and a first driving circuit of the display screen, a backlight source, and a second driving of the backlight. The first output of the touch excitation source is configured to apply a touch signal to the connected electrode lines at least part of the detection period; the touch signal detection circuit is configured to select at least part of the detection period A part of the zero-polarity line is a touch detection electrode to detect whether the part of the electrode line is touched; the touch detection electrode means that the touch signal is applied to the electrode At the same time, the electrode that passes through the change of the touch signal of the electrode is also detected. The touch circuit selects a part of the electrode as a detecting electrode, and the part of the electrode line of the touch substrate is a touch reflow electrode. The touch reflow electrode refers to a second output end connected to the touch excitation source or connected to another when the touch signal is applied to the touch detection electrode and the change of the touch signal is detected. The touch excitation source provides the touch electrode of the return path for the touch signal on the detecting electrode. 2. For example, the capacitive touch screen described in claim 1 wherein the touch reflow electrode is part or all of an electrode line that does not intersect the touch detection electrode, or a partial or All of the electrode lines intersecting the touch detection electrodes, or some or all of the electrode lines intersecting the touch detection electrodes and not intersecting with 099102312 Form No. A0101 No. 53 stomach / Total 66 pages 0993184754-0 201126402. 3. The capacitive touch screen of claim 2, wherein the touch reflow electrode that does not intersect the touch detection electrode is an electrode line on an adjacent side or both sides of the touch detection electrode . A capacitive touch screen includes: a touch substrate and a touch circuit, the touch circuit has a touch excitation source and a touch signal detection circuit, and the touch substrate is provided with a touch electrode group When the touch substrate is provided with not less than two sets of touch electrodes, the touch electrodes are disposed on different touch substrates or are separated on the same touch substrate by an insulating layer; the touch The substrate is disposed on an application product, the application product has a display system, including a display screen and a first driving circuit of the display screen, a backlight source and a second driving circuit of the backlight source; An output end is configured to apply a touch signal to the connected electrode line at least part of the detecting period; the touch signal detecting circuit is configured to select at least a part of the electrode line as a touch detecting electrode during at least part of the detecting period To detect whether the part of the electrode line is touched; the touch detection electrode refers to detecting the touch signal flowing through the electrode while applying the touch signal to the electrode The electrode of the application product is provided with an electrode; the touch circuit selects the electrode on the outer casing of the application product as a touch reflow electrode; and the touch reflow electrode refers to detecting the touch Applying the touch signal to the electrode and detecting the moment of the change of the touch signal, connecting the second output end of the touch excitation source or the other touch excitation source to the touch signal on the detecting electrode The touch electrode is provided with a return path. 5. The capacitive touch screen of claim 1 or 4, wherein the touch substrate is a flexible or rigid transparent substrate. 099102312 Form No. A0101 Page 54 of 66 0993184754-0 201126402 6 The capacitive touch screen of claim 1 or 4, wherein the touch electrode is a display screen electrode. 7. The capacitive touch screen of claim 1 or 4, wherein the δ ray touch circuit simultaneously performs touch detection on the plurality of touch detection electrodes on the touch substrate. The capacitive touch screen of claim 1 or 4, wherein the touch sensing electrode and the touch reciprocating electrode are connected to different output terminals or different touch excitations The touch signals on the source output are different. 10 . 11. The zero-capacity touch screen as described in claim 8 wherein the difference in the touch signal means that at least one of the amplitude, phase and frequency of the touch signal is different. The capacitive touch screen of claim 1 or 4, wherein the touch circuit and the host circuit and the display system of the application product, or the touch circuit power supply and the host circuit of the application product Between the power supply and the display system power supply, or between the touch excitation source of the touch circuit and the host circuit power supply and the display system power supply of the application product, a signal isolation device is provided, and the signal isolation device is a touch signal. High resistance device. The capacitive touch screen of the first or fourth aspect of the invention, wherein the touch electrode on the touch substrate is a set of disjoint electrode lines, and the touch circuit compares the different electrode lines. The size of the touch signal changes determines a touched electrode, and the position of the touched point on the touched electrode is located by the size of the touch signal on the touched electrode. The invention relates to a capacitive touch screen according to claim 1 or 4, wherein the touch electrode on the touch substrate is a group of disjoint electrode lines, and different electrode lines are in different directions. With the terminal, take the electric form number of the different direction of the terminal Α 010〗 Page 55 / 66 page 0993184754-0 201126402 The polar line is the detection electrode; the touch circuit compares the size of the touch signal change on different touch electrode lines The touched electrode is determined, and the position of the touched point on the touched electrode is located by comparing the size of the touch signal change on the detecting electrode in the different direction leading end. 13. The capacitive touch screen of claim 11 or 12, wherein the disjoint electrode lines are fold lines. 099102312 Form number A0101 Page 56 of 66 0993184754-0