WO2016093526A1 - Panneau à écran tactile - Google Patents

Panneau à écran tactile Download PDF

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Publication number
WO2016093526A1
WO2016093526A1 PCT/KR2015/012871 KR2015012871W WO2016093526A1 WO 2016093526 A1 WO2016093526 A1 WO 2016093526A1 KR 2015012871 W KR2015012871 W KR 2015012871W WO 2016093526 A1 WO2016093526 A1 WO 2016093526A1
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WIPO (PCT)
Prior art keywords
touch
sensor
screen panel
touch screen
sensor pattern
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PCT/KR2015/012871
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English (en)
Korean (ko)
Inventor
이성호
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주식회사지2터치
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Publication of WO2016093526A1 publication Critical patent/WO2016093526A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Definitions

  • the present invention relates to a touch screen panel for detecting a capacitive touch input of a finger or a touch input tool having a similar conductive property. More particularly, the present invention relates to a touch drive by differently arranging areas of a sensor pattern mounted on a touch panel. The present invention relates to a touch screen panel that can uniformize the magnitude of the touch signal received from the IC.
  • a touch screen panel is attached to a display device such as a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting diode (OLED), an active matrix organic light emitting diode (AMOLED), or the like.
  • a display device such as a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting diode (OLED), an active matrix organic light emitting diode (AMOLED), or the like.
  • a signal corresponding to a corresponding position is generated when an object such as a finger or a pen is touched.
  • Touch screen panels are used in a wide range of applications, such as small portable terminals, industrial terminals, and digital information devices (DIDs).
  • the capacitive touch screen panel has a high transmittance, it can recognize a soft touch (soft touch), and multi-touch and gesture recognition has the advantage of expanding the market gradually.
  • a transparent conductive film is formed on upper and lower surfaces of a transparent substrate 2 made of plastic, glass, or the like, and a voltage applying metal electrode 4 is formed at each of four corners of the transparent substrate 2.
  • the transparent conductive film is formed of a transparent metal such as indium tin oxide (ITO) or antimony tin oxide (ATO).
  • the metal electrodes 4 formed at four corners of the transparent conductive film are formed by printing a conductive metal having a low resistivity such as silver (Ag).
  • a resistance network is formed around the metal electrodes 4. The resistance network is formed in a linearization pattern in order to transmit control signals evenly over the entire surface of the transparent conductive film.
  • a protective film is coated on the transparent conductive film including the metal electrode 4.
  • the capacitive touch screen panel when an alternating current voltage of high frequency is applied to the metal electrode 4, the capacitive touch screen panel spreads on the front surface of the transparent substrate 2. At this time, if you lightly touch the transparent conductive film on the upper surface of the transparent substrate 2 with the finger 8 or the conductive touch input tool, a certain amount of current is absorbed into the body and the current sensor built in the controller 6 detects the change of current. The touch points are recognized by calculating the amount of current in each of the four metal electrodes 4.
  • the capacitive touch screen panel as shown in FIG. 1 is a method of detecting the magnitude of the micro current, and thus requires an expensive detection device, which increases the price and makes it difficult to multi-touch to recognize a plurality of touches.
  • the capacitive touch screen panel as shown in FIG. 2 is mainly used.
  • the touch screen panel of FIG. 2 includes a linear sensor pattern 5a in the horizontal direction, a linear sensor pattern 5b in the longitudinal direction, and a touch drive IC 7 for analyzing a touch signal.
  • the touch screen panel detects the magnitude of the capacitance formed between the linear sensor pattern 5 and the finger 8, and scans the linear sensor pattern 5a in the horizontal direction and the linear sensor pattern 5b in the longitudinal direction. By detecting the signal, a plurality of touch points can be recognized.
  • the touch screen panel as described above is mounted and used on a display device such as an LCD, a phenomenon in which signal detection is difficult due to noise occurs.
  • the LCD uses a common electrode, and in some cases, an AC common voltage Vcom is applied to the common electrode.
  • the common voltage Vcom of the common electrode acts as noise when detecting the touch point.
  • FIG. 3 shows an embodiment in which a conventional capacitive touch screen panel is installed on an LCD.
  • the display device 200 has a structure in which a liquid crystal is sealed between the lower TFT substrate 205 and the upper color filter 215 to form the liquid crystal layer 210.
  • the TFT substrate 205 and the color filter 215 are bonded by the sealant 230 at the outer portion thereof.
  • a polarizing plate is attached to the upper and lower sides of the liquid crystal panel, and in addition, a BLU (Back Light Unit) is installed.
  • BLU Back Light Unit
  • a touch screen panel is installed on the display device 200 as shown.
  • the touch screen panel has a structure in which the linear sensor pattern 5 is mounted on the upper surface of the substrate 1.
  • a protective panel 3 for protecting the linear sensor pattern 5 is attached on the substrate 1.
  • the touch screen panel is attached to an edge portion of the display device 200 through an adhesive member 9 such as a double adhesive tape (DAT), and forms an air gap 9a between the display device 200.
  • DAT double adhesive tape
  • a capacitance such as Ct is formed between the finger 8 and the linear sensor pattern 5.
  • a capacitance such as Cvcom is formed between the linear sensor pattern 5 and the common electrode 220 formed on the lower surface of the color filter 215 of the display device 200, and the linear sensor pattern 5 has a capacitance.
  • Cp which is an unknown parasitic capacitance due to capacitive coupling between patterns or manufacturing process factors, is also working.
  • a circuit such as the equivalent circuit of FIG. 4 is configured.
  • the conventional touch screen panel detects a touch by detecting a change amount of Ct, but Cvcom and Cp act as noise in detecting Ct.
  • an air gap 9a is disposed between the touch screen panel and the display device 200 as shown in FIG. 3.
  • a shielding layer is formed by applying ITO or the like to the lower surface of the substrate 1 of the touch screen panel, and the shielding layer is grounded with the ground signal.
  • the air gap 9a increases the thickness of the product and quality deterioration occurs.
  • a separate shielding layer and a manufacturing process are required to configure the shielding layer, an increase in manufacturing cost is caused.
  • the touch screen panel is embedded in the LCD, it is impossible to form the air gap 9a or the shielding layer, and thus it is impossible to manufacture the touch screen panel in the LCD or the like.
  • the sensor pattern of FIG. 5 is composed of only one sensor pattern 10, not the linear sensor pattern of FIG. 2.
  • the sensor pattern is connected to point P, which is a touch detection unit, connects an auxiliary capacitor (Caux) to point P, applies a driving voltage through the auxiliary capacitor, and touch capacitance between the sensor pattern 10 and the touch input tool.
  • (Ct) is added, the touch signal is detected by using a phenomenon that a difference occurs in the magnitude of the voltage or current detected by the touch detector according to the magnitude of the touch capacitance.
  • this detection method it is possible to detect a touch signal irrespective of noise by detecting a noise generated in a display device such as an LCD and avoiding a point of occurrence of the noise, or as shown in FIG. Since the amount of noise detected in one sensor pattern is smaller than the amount of noise detected in the plurality of sensor patterns, as shown in FIG. 5, the touch screen panel as shown in FIG. 6 may detect the touch signal less sensitive to noise. Do.
  • FIG. 5 illustrates an embodiment of a configuration of one sensor pattern, and a touch screen panel including a plurality of sensor patterns is configured as shown in FIG. 6.
  • the touch drive IC 30 includes a driver 31, a touch detector 14, a timing controller 33, a signal processor 35, and a memory 28, and a common voltage detector 43. ), A common voltage receiver 45, and an alternating voltage generator 37.
  • the touch drive IC 30 includes a common voltage detector 43, a common voltage receiver 45, and an alternating voltage generator 37 as shown in FIG. 6, and is selected by the selector 47.
  • the detector 43, the common voltage receiver 45, or the alternate voltage generator 37 may be configured to be selected.
  • the driving signal acquired by the touch drive IC 30 is transferred to the CPU 40.
  • the CPU 40 may be a CPU of a display device, a main CPU of a computer device, or a CPU of the touch screen panel itself.
  • a touch processor may be processed by embedding a microprocessor such as 8bit or 16bit.
  • the system configuration further includes a power supply unit for generating a high or low voltage of signals for detecting a touch input.
  • the microprocessor embedded in the touch drive IC 30 recognizes touch points, gestures such as zoom, rotation, and move by calculating touch input coordinates, and reference coordinates (or center point coordinates). ) And gestures can be transferred to the main CPU.
  • gestures such as zoom, rotation, and move by calculating touch input coordinates, and reference coordinates (or center point coordinates).
  • gestures can be transferred to the main CPU.
  • the timing controller 33 generates a time division signal of several tens of ms or less, and the signal processor 35 transmits and receives a signal to each sensor pattern 10 through the driver 31.
  • the driver 31 supplies the on / off control signal Vg of the charging means 12 and the precharge signal Vpre.
  • the on / off control signal Vg is time-divided by the timing controller 33 and is supplied sequentially or non-sequentially for each sensor pattern 10.
  • the memory unit 28 stores an initial value which is a signal when no touch occurs in each sensor pattern 10 or stores a signal when a touch occurs, and provides a unique absolute address for each sensor pattern 10.
  • the memory 28 may temporarily store the coordinate values obtained with only one, or may store the reference value when no touch occurs.
  • the plurality of memory means may be configured to separately store a reference value when no touch occurs and a detection value when a touch occurs.
  • the illustrated embodiment illustrates the case where the sensor pattern 10 has a resolution of 4 * 5, since the sensor pattern 10 actually has a higher resolution, a signal may be lost while processing many signals.
  • the signal processor 35 when the signal processor 35 is in a “busy” state, the signal may not be recognized because the touch driving signal is not recognized.
  • the memory unit 28 may prevent the loss of such a signal.
  • the signal processor 35 temporarily stores the detected touch signal in the memory unit 28. After scanning the entire sensor pattern 10, the memory unit 28 is referred to to determine whether there is a missing signal. If the touch coordinates are omitted in the signal processing but stored in the memory 28, the signal processor 35 recognizes the touch coordinates as a normal input.
  • the common voltage receiver 45 directly receives the common voltage information of the common electrode 220 from the display device 200.
  • information such as the start point, magnitude, rising section, and falling section of the common voltage can be obtained very easily, and the signal processing unit 35 can easily process signals in conjunction with the rising and falling sections of the common voltage.
  • a burden arises in that the display apparatus 200 needs to transmit common voltage information.
  • the alternating voltage generator 37 may apply the alternating voltage to the common electrode 220 by force.
  • the alternating voltage generation unit 37 applies a voltage level alternated at a predetermined frequency to the common electrode 220 according to the time division signal of the timing controller 33.
  • the frequency of the alternating voltage applied to the common electrode 220 can be adjusted by adjusting a resistor.
  • the signal processor 35 can easily process the signal in association with the rising and falling sections of the common voltage.
  • the burden of sending a common voltage to the display device 200 is generated.
  • the common voltage detector 43 automatically detects the common voltage information, it is not necessary to exchange information related to the common voltage with the display device.
  • the signal processor 35 applies a driving voltage delivered to the auxiliary capacitor while avoiding the rising or falling edge of the common voltage.
  • the common voltage detector 43 may have various circuit configurations.
  • the sensor signal line 22 is typically connected between the sensor patterns 10 in the active region in which the sensor patterns 10 are installed and connected to the touch drive IC 30. If the touch screen panel is separately installed on the display device or embedded in the display device, the sensor signal line 22 should be formed of ITO or indium zinc oxide (IZO), which is a transparent signal line, at least in the visible region.
  • ITO indium zinc oxide
  • IZO indium zinc oxide
  • the signal line connected to the sensor pattern 10 (1, 1) located at the top and the sensor pattern 10 (1, 5) located at the bottom thereof are provided. Since the length of the connected signal line is different, the wiring resistance of the signal line is different for each sensor pattern 10. When the resistance value increases, a delay occurs in the detection of the touch signal. Therefore, the width of the sensor signal line 22 that is wired to the top is wider than the width of the sensor signal line 22 that is wired to the bottom, so that the width of the sensor signal line 22 that is wired to the top is increased.
  • the touch processor detects the touch signal more easily.
  • the opposing area of the display device and the sensor signal line 22 connected to the sensor pattern and the sensor pattern increases, which leads to an increase in the common electrode capacitance Cvcom, so that the touch signal detected in each part of the touch screen panel is increased. Problems arise that are not even.
  • an application hereinafter referred to as an application that uses the area detected by the touch.
  • Such an application may be an application that steps on or accelerates the accelerator pedal of a vehicle by using a change in the touch area when the finger is touched and released. As described above, if the area detected in each part of the touch screen panel is changed in value, the speed or brake response of the vehicle by the touch will be changed in the area where the area is small and the area is detected.
  • the display device 200 has a common electrode 220.
  • the common electrode 220 may be a Vcom electrode of the LCD or another type of electrode. 10 illustrates an LCD among display devices.
  • the display device 200 illustrated in FIG. 7 has a structure in which a liquid crystal is encapsulated between a lower TFT substrate 205 and an upper color filter 215 to form a liquid crystal layer 210.
  • the TFT substrate 205 and the color filter 215 are bonded by the sealant 230 at the outer portion thereof.
  • a polarizing plate may be attached to the upper and lower sides of the liquid crystal panel, and in addition, optical sheets constituting a BLU and a brightness enhancement film may be installed together with the BLU.
  • a substrate 50 of the touch screen panel is installed on the display device 200.
  • the substrate 50 is attached to the upper portion of the display device 200 through an adhesive member 57 such as a double adhesive tape (DAT) at an outer portion thereof.
  • An air gap 58 is formed between the substrate 50 and the display device 200.
  • the common electrode 220 of the display device 200 is applied with a common voltage level that is alternately at a predetermined frequency and whose magnitude is changed or has a predetermined magnitude of DC.
  • a common voltage level that is alternately at a predetermined frequency and whose magnitude is changed or has a predetermined magnitude of DC.
  • the common voltage of the common electrode 220 is alternated as shown in FIG. 5, and an LCD such as a notebook or a monitor / TV that performs dot inversion uses a common voltage of DC level, which is a certain voltage.
  • a common electrode capacitance Cvcom is formed between the sensor pattern 10 and the common electrode 220 of the display device 200. If a precharge signal is applied to the sensor pattern 10, the common electrode capacitance Cvcom has a predetermined voltage level due to the charging voltage. At this time, since one end of the common electrode capacitance Cvcom is grounded with the common electrode 220, when the common electrode 220 is an alternating voltage, the common electrode capacitance Cvcom is changed by an alternating voltage applied to the common electrode 220. The potential at the other end of the sensor pattern 10 will alternate, and if the common electrode is DC, the potential at the sensor pattern 10 will not alternate.
  • FIG. 7 a protective layer 24 for protecting the sensor pattern 10 is illustrated.
  • the touch signal is detected by P in the circuit diagram of FIG. 5, that is, the touch detector 14 by the following equation.
  • ⁇ Equation 1> is a touch signal detected by the touch detector 14 when the touch is not touched
  • ⁇ Equation 2> is when the touch by the finger That is, the touch signal detected by the touch detector 14 when the finger and the sensor pattern 10 face each other.
  • the difference between ⁇ Equation 1> and ⁇ Equation 2> is the difference in the presence or absence of the touch capacitance Ct in the denominator.
  • the touch capacitance (Ct) occurs by touch, it is determined according to ⁇ Equation 2>. Since the magnitude of the detected signal is different, it is possible to calculate the magnitude of the touch signal by calculating it.
  • the width of the sensor signal line 22 varies for each position of the sensor pattern 10 so as to equalize the resistance of the sensor signal line 22.
  • the sum of the areas of the pattern 10 and the sensor signal line 22 becomes larger as the long distance from the touch drive IC 30.
  • the larger the distance detected from the touch drive IC is for the same touch area, and the shorter the distance from the touch drive IC, the larger the detected signal for the same touch area. Can cause different problems.
  • the present invention has been proposed in order to solve the problems of the conventional capacitive touch screen panel as described above, by changing the size of the sensor pattern 10 constituting the touch screen panel for each position facing the touch drive IC (
  • the present invention provides a touch detection method for equally acquiring a magnitude of a touch signal detected by varying the magnitude of Ct (or a second touch signal value obtained through calculation based on this) regardless of the position of the touch screen panel. There is a purpose.
  • the touch screen panel of the present invention since the magnitude of the touch signal detected at any point of the touch screen panel is constant regardless of the occupied area of the sensor signal line 22 connected to the sensor pattern 10, the application using the touch signal. In such an embodiment, it is possible to supply a stable signal in which the inflection point of the signal does not occur.
  • a uniform touch signal can be output regardless of the position of the touch screen panel, and ultimately, more accurate touch coordinates can be calculated.
  • FIG. 1 is a perspective view showing an example of a conventional touch screen panel.
  • FIG. 2 is a plan view showing another example of a conventional touch screen panel.
  • FIG. 3 is a side cross-sectional view illustrating an example in which the touch screen panel (including the linear sensor pattern 5) of FIG. 2 is installed on a display device.
  • FIG. 4 is an equivalent circuit diagram of detecting touch capacitance in FIG. 3.
  • FIG. 5 is an equivalent circuit diagram for extracting a touch in a panel having a sensor pattern 10 separated from each other in comparison to the touch screen panel of FIG. 2.
  • each sensor pattern 10 is separately formed.
  • FIG. 7 is a side cross-sectional view illustrating an example in which the touch screen panel (including separate sensor patterns 10) of FIG. 6 is installed on a display device.
  • FIG. 8 is a side cross-sectional view (FIG. 8A) and a plan view (FIG. 8B) of a touch screen panel according to an exemplary embodiment of the present invention.
  • FIG. 9 is a diagram schematically illustrating a configuration of a sensor pattern and a sensor signal line of a touch screen panel according to the present invention.
  • FIG. 10 is a diagram schematically illustrating a method for calculating capacitance generated by a touch according to the present invention.
  • FIG. 11 is a diagram schematically illustrating another exemplary embodiment of a configuration of a sensor pattern and a sensor signal line of a touch screen panel according to the present invention.
  • FIG. 12 is an embodiment of a method for interconnecting a sensor signal line and a touch drive IC according to the present invention.
  • a touch detector to detect whether a touch is detected by detecting a difference between voltage signals received according to whether the touch capacitance is formed;
  • the area of the sensor pattern may vary depending on a distance from the touch detector.
  • the area of the sensor pattern is increased in proportion to the distance from the touch detector.
  • the width of the sensor signal line is increased in proportion to each length, but the width of the sensor signal line is increased in proportion to the distance from the touch detector.
  • Spacing between two neighboring sensor signal lines may vary depending on the width of a wider sensor signal line among two neighboring sensor signal lines.
  • the size of the common electrode capacitance Cvcom at the position where the sensor pattern is disposed is considered.
  • the size of the sensor pattern is characterized in that the size of the parasitic capacitance (Cp) generated in the sensor pattern.
  • the sensor signal line and the sensor pattern may be formed in a single layer using a single mask as a transparent conductor.
  • the transparent conductor is characterized in that ITO.
  • the sensor signal line is formed of a metallic material, and the sensor pattern is formed of a transparent conductor.
  • connection pad portion of the sensor signal line connected to the touch detector is formed of a metal material.
  • the metal material is characterized in that one of gold, silver or aluminum.
  • the present invention relates to a touch screen panel, and more particularly, to a touch panel mounted on a display device, and is not limited to a specific type. That is, the present invention may be applied to both an on-cell touch device and an in-cell touch device.
  • the present invention relates to a touch screen panel having a sensor pattern having a different area, and unlike a conventional capacitive touch screen panel in which a touch signal is differently detected for each touch position, a value detected regardless of the touch position is the same. It is a way to make it a value.
  • the display device referred to in the present invention means any one of LCD, PDP, OLED, AMOLED, or any means for displaying other images.
  • the LCD requires a common voltage (Vcom) to drive the liquid crystal.
  • Vcom common voltage
  • a line inversion method in which a common voltage of a common electrode alternates with one or more gate lines is used to reduce current consumption.
  • a large LCD has a DC level at which the common voltage of the common electrode is constant.
  • some display devices form a shielding electrode common to the entire panel to block external ESD, and ground it with a ground signal.
  • the common electrode is located on the TFT substrate, and the common voltage detected on the upper surface of the color filter alternates up and down at an unspecified frequency with respect to the DC level.
  • common electrodes in addition to the electrode to which the common voltage Vcom is applied as described above, all electrodes which are commonly used in the display device are referred to as “common electrodes” and the alternating voltage, DC voltage, or unspecified applied to the common electrode of the display device Voltage in the form of alternating frequency is referred to as "common voltage”.
  • the present invention detects a non-contact touch input of a touch input tool having a finger or similar electrical characteristics.
  • non-contact touch input means that a touch input tool such as a finger makes a touch input while being spaced apart from the sensor pattern by a substrate at a predetermined distance.
  • the touch input tool may contact the outer surface of the substrate.
  • the touch input tool and the sensor pattern remain in a non-contact state. Accordingly, the touch action of the finger on the sensor pattern may be expressed by the term “access”.
  • the finger since the finger may be in contact with the outer surface of the substrate, the touch action of the finger against the substrate may be expressed by the term "contact”.
  • access and “contact” are commonly used as the meaning above.
  • configurations such as “ ⁇ ” described below are components that perform certain roles, and mean software components or hardware components such as a field-programmable gate array (FPGA) or an application specific integrated circuit (ASIC).
  • FPGA field-programmable gate array
  • ASIC application specific integrated circuit
  • “ ⁇ part” may be included in a larger component or “ ⁇ part” or may include smaller components and “ ⁇ part”. Also, the " ⁇ part” may have its own CPU.
  • FIG. 8 is a side cross-sectional view (FIG. 8A) and a plan view (FIG. 8B) of a touch screen panel according to an exemplary embodiment of the present invention.
  • FIG. 8A as the sensor pattern 10 disposed on the touch screen panel is farther from the touch drive IC 30, the size or area of the sensor pattern 10 increases and the touch drive IC 30 is increased. The shorter the distance from ()), the smaller the size or area of the sensor pattern 10 is.
  • the sensor pattern 10-1 farthest from the touch drive IC 30 is much wider than the sensor pattern 10-8 farthest from the touch drive IC 30. Accordingly, the sensor pattern 10-1 is much larger than the sensor pattern 10-8 in the overall size, that is, area.
  • FIG. 8B is a plan view schematically illustrating a structure of a sensor pattern according to an exemplary embodiment of the touch screen panel according to the present invention.
  • the touch screen panel 800 of the present invention has the largest size of the sensor pattern 10-1 disposed in row 1 and is close to the touch drive IC 30.
  • the sensor pattern is configured to decrease in size from row 2-> row 3-> row 4-> row 5-> row 6-> row 7-> row 8.
  • the size of the sensor pattern 10-8 configured in row-8 is configured to have the smallest size.
  • FIG. 9 is a diagram schematically illustrating a configuration of a sensor pattern and a sensor signal line of the touch screen panel 900 according to the present invention.
  • the touch drive IC 30 of FIG. 9 includes a driver 31, a touch detector 14, a signal processor 47, and the like as shown in FIG. 6, and the touch drive IC 30 is mounted on the touch screen panel. Connected.
  • the touch drive IC 30 is connected to a touch screen panel by a chip on glass (COG) or a flexible circuit board such as a chip on film (COF) or an FPC, and has a sensor signal line 22 originating from the sensor pattern 10. Connected.
  • COG chip on glass
  • COF chip on film
  • FPC FPC
  • sensor signal lines 22 are connected to each sensor pattern 10 one by one, and each sensor signal line 22 is connected to the touch drive IC. If the finger is adjacent to the sensor pattern 10 at a distance of “d”, the touch capacitance Ct is proportional to the dielectric constant e of the material existing between the finger and the sensor pattern 10 as shown in FIG. 10. The touch capacitance is proportional to the opposing area of the finger 25 and the sensor pattern 10.
  • the sensor pattern 10 and the sensor signal line 22 are made of a transparent conductor such as indium ion oxide (ITO), the resistivity of the ITO is relatively large, so that the resistance of the sensor signal line 22 is about several hundred Kohm. do.
  • ITO indium ion oxide
  • the resistance of the sensor signal line 22 is about 833k ⁇ .
  • the resistance value of the sensor signal line 22 is proportional to the distance between the sensor pattern 22 and the touch drive IC 30, and as a result, each sensor It is proportional to the length of the signal line 22 itself.
  • the resistance value of the sensor signal line 22e connecting the touch drive IC 30 and the sensor pattern 10e at a short distance is the sensor pattern 10a located at a distance from the touch drive IC 30. ) Is smaller than the resistance value of the sensor signal line 22a.
  • the touch screen panel 900 does not constitute the same size (or area) of the sensor pattern and the width of the sensor signal line. It is characterized by the configuration differently.
  • the size (or area) of the sensor pattern and the width of the sensor signal line are proportional to the distance from the touch drive IC 30.
  • the size of the sensor pattern 10a distant from the touch drive IC 30 and the width of the sensor signal line 22a connected thereto are the size of the sensor pattern 10e at a short distance and the sensor connected thereto. Each larger than the width of the signal line 22e.
  • the size of the sensor pattern is configured in the order of 10a> 10b> 10c> 10d> 10e according to the distance from the touch drive IC 30.
  • the widths of the sensor signal lines connected to the respective sensor patterns are also arranged in the order of 22a> 22b> 22c> 22d> 22e.
  • the wiring width of the sensor signal line 22a is widened.
  • the wiring width “w” is widened.
  • the wiring width of the sensor signal line 22a connected to the remote sensor pattern 10a will be the widest, and according to the calculation result of Equation 3, As the width gradually narrows, it has already been discussed above.
  • the widths of the sensor signal lines 22 are different for each position, the sum of the area of the sensor pattern 10 and the area of the sensor signal lines 22 is equal to the sensor pattern 10 having the same area.
  • the position of the pattern 10 is different from each other.
  • the sum of the area of the sensor pattern 10 and the sensor signal line 22 at the same position in the touch drive IC 30 may be the same or similar.
  • the sum of the area of the sensor signal lines 22 and the sensor pattern 10 connected thereto is the same or almost similar. .
  • the area of the sensor signal line 22 connected to the sensor pattern 10 located at the left and right sides of the row may be slightly larger than the sensor signal line located at the center. Therefore, when the touch signal is used, the error caused by this magnitude difference is small enough to be negligible. Therefore, the sum of the area of the sensor signal line 22 and the area of the sensor pattern in the same row is It may be the same.
  • the common electrode capacitance causes a difference for each position of the sensor pattern 10.
  • the common electrode capacitance Cvcom is a capacitance formed between the common electrode 220 and the sensor pattern 10 of the display device. Since the sensor pattern 10 is connected to the sensor signal line 22, the size of the common electrode capacitance Cvcom of the sensor signal line 22a remote from the touch drive IC 30 is shorter than that of the touch drive IC 30. It becomes larger than the size of the sensor signal line 22e.
  • the touch signals are detected by the above-described Equations 1 and 2
  • the common electrode capacitance Cvcom since the common electrode capacitance Cvcom is located in the denominator of the equation, the position of the touch screen panel with respect to the same touch capacitance Ct. The difference occurs in the detection signal.
  • the magnitude of the signal detected by the sensor pattern (10e in FIG. 9) located at a short distance in the touch drive IC is obtained by ⁇ Equation 1> and ⁇ Equation 2>.
  • the size of the touch (hereinafter referred to as touch amount) can be extracted by the size difference of ⁇ Equation 2>, which is the signal size when the touch is generated, compared to the size of ⁇ Equation 1>, which is the signal when the touch does not occur. Can be.
  • the size of the touch is the area of the finger facing the sensor pattern 10 as shown in FIG. 10.
  • the size of the touch signal is increased, and if the touch is weak, the size of the touch signal is reduced.
  • the amount of touch detected by the touch drive IC and the sensor pattern 10 located near is a touch amount in a state where the common electrode capacitance Cvcom is small. Therefore, referring to Equation 2, the touch amount reacts sensitively even to a small change amount of the touch capacitance Ct.
  • the change amount of the touch capacitance Ct may be increased.
  • the change amount of the touch capacitance Ct should be larger as the far distance. For example, if the change in touch capacitance is near 0 ⁇ 10 at short distance, the change in Ct at 0 ⁇ 12 at medium distance and 0 ⁇ 14 at long distance will be 0 ⁇ 14. You can get it.
  • the opposing area of the finger 25 and the sensor pattern 10 should be increased.
  • the touch capacitance Ct determined by the equation of FIG. 10 is applied to Ct in the denominator of ⁇ Equation 1> and ⁇ Equation 2>.
  • the common electrode capacitance Cvcom according to different areas of the sensor signal line 22 connected to the sensor pattern 10 disposed at a long distance and at a short distance is also determined by the equation of FIG. 10, and Cvcom determined here is also ⁇ The same applies to Cvcom in the denominator of equations (1) and (2).
  • the magnitude of the touch capacitance Ct should be different in order to change the amount based on Equation 1 and Equation 2 as described above. Therefore, since the change amount of the touch capacitance Ct should be larger, the area of the sensor pattern 10 should be wider.
  • the area of the sensor pattern 10 is wider at a distance from the touch drive IC 30 and the area of the sensor pattern 10 is narrow at a short distance, that is, 10a> 10e.
  • the amount of change in the touch capacitance Ct detected by the sensor pattern 10 at a long distance is large and the amount of change in the touch capacitance Ct detected by the sensor pattern 10 at a short distance is small. It is possible to keep the amount of touch generated at any point of the touch screen panel constant.
  • the parasitic capacitance is generated between the sensor signal lines 22b disposed at a long distance between 22a and 22c surrounding the path.
  • Cp of the denominator is a parasitic capacitance
  • various parasitic capacitances are generated, one of which is a parasitic capacitance generated between the sensor signal lines 22.
  • the parasitic capacitance generated between the sensor signal lines 22 is inversely proportional to the opposing distance “d” and proportional to the “A” of the opposing area, referring to the equation of FIG. The narrower and longer the opposing length becomes, the larger the parasitic capacitance Cp becomes.
  • the wiring widths facing each other should be wider at a far distance.
  • 22b of FIG. 11 should make the width of “a”, the distance between 22a surrounding it, and “b”, the distance from 22c, as wide as possible.
  • the distance between the sensor signal line and the sensor signal line is farther away, the distance between the sensor signal lines may be different.
  • the sensor signal lines 22 connecting the sensor patterns 10 at the same distance from the touch drive IC may maintain the same distance from the sensor signal lines around the touch drive IC, and thus the same distance from the touch drive IC 30 may be maintained.
  • the parasitic capacitance Cp generated in the sensor pattern 10 and the sensor signal line 22 connected to each other can be kept constant.
  • 20 sensor signal lines 22 are connected to the touch drive IC 30, and the touch drive IC 30 is mounted on a flexible circuit board such as a form of COG or COF, or an FPC.
  • the sensor signal line 22 is connected.
  • the sensor signal lines and the touch drive IC are connected using the ACF.
  • the reference for determining the size of the sensor pattern may be the size of the common electrode capacitance Cvcom at the position where the sensor pattern is disposed.
  • the reference for determining the size of the sensor pattern may be the size of the parasitic capacitance Cp generated in the sensor pattern.
  • FIG. 12 is an embodiment of a method for interconnecting a touch drive IC having a sensor signal line 22 formed in a TSP and a COF package.
  • the sensor signal line 22 and the sensor pattern 10 may be made of a single transparent conductor such as ITO, or the sensor pattern 10 may be made of a transparent conductor, and the sensor signal line 22 may be formed of a transparent conductor. It may be composed of metal materials such as silver (Ag), gold (Au), or aluminum (Al).
  • the sensor signal line 22 is composed of a transparent conductor such as ITO
  • an ACF is used to connect (bond, bond) the touch drive IC 30 configured as a COF package, and the conductive ball included in the ACF is subjected to proper pressure and heat.
  • the connecting pad 1200 of the TSP and the COF 1300 are energized.
  • the conductive ball may break the transparent whole of the connection pad, which may cause a reliability problem that causes a problem in signal flow.
  • connection pad portion 1200 is preferably coated with a metal component such as gold, silver, or aluminum.
  • a metal component is included in the “connection pad” portion, and the metal component is positioned above or below the transparent conductor constituting the sensor signal line 22. If the metal component is positioned above the transparent conductor constituting the sensor signal line 22, the sensor pad 10 and the sensor signal line 22 are formed of the transparent conductor, and then a metal pad may be formed using a metal mask. After the metal pad is generated with the metal mask, the sensor pattern 10 and the sensor signal line 22 are formed on the upper surface of the metal pad using a transparent conductor.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

La présente invention concerne un panneau à écran tactile pour détecter des entrées de toucher capacitives par un ou plusieurs doigts du corps ou un moyen d'entrée de toucher ayant des propriétés conductrices similaires à celles du ou des doigts, et, de manière plus spécifique, un panneau à écran tactile capable d'égaliser les amplitudes de signaux de toucher reçus par un circuit intégré (IC) de pilote de toucher par agencement de façon différente des zones des motifs de capteur montés sur le panneau tactile. Le panneau à écran tactile selon l'invention de la présente demande a les effets consistant à permettre à des signaux de toucher d'être délivrés uniformément indépendamment de la position du panneau à écran tactile et à permettre enfin aux coordonnées de toucher d'être calculées de manière plus précise.
PCT/KR2015/012871 2014-12-10 2015-11-27 Panneau à écran tactile WO2016093526A1 (fr)

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KR10-2014-0177766 2014-12-10
KR1020140177766A KR101637422B1 (ko) 2014-12-10 2014-12-10 터치 스크린 패널

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KR101968271B1 (ko) * 2016-11-01 2019-08-20 주식회사 지2터치 터치 스크린 기능을 구비한 표시 장치
KR102205762B1 (ko) * 2017-04-11 2021-01-21 주식회사 지2터치 터치 스크린
KR102397356B1 (ko) * 2021-03-10 2022-05-12 이성호 복수의 서로 다른 면적으로 구성된 검출부 및 이를 이용한 오브젝트 검출장치
KR102695551B1 (ko) 2021-09-19 2024-08-13 이성호 서로 다른 cda 면적으로 구성된 오브젝트 검출장치 및 검출방법
KR20240020779A (ko) 2022-08-09 2024-02-16 이성호 도전체 상면의 신호선 배치법
KR20240020778A (ko) 2022-08-09 2024-02-16 이성호 도전체 상면의 신호선 배치법
KR20240020777A (ko) 2022-08-09 2024-02-16 이성호 도전체 상면의 신호선 배치법
KR20240020782A (ko) 2022-08-09 2024-02-16 이성호 도전체 상면의 신호선 배치법
KR20240020773A (ko) 2022-08-09 2024-02-16 이성호 도전체 상면의 신호선 배치 법
KR20240020783A (ko) 2022-08-09 2024-02-16 이성호 도전체 상면의 신호선 배치법
KR20240020776A (ko) 2022-08-09 2024-02-16 이성호 도전체 상면의 신호선 배치법
KR20240020780A (ko) 2022-08-09 2024-02-16 이성호 도전체 상면의 신호선 배치법

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