KR20160084349A - Touch screen panel - Google Patents

Abstract

The present invention relates to a touch screen panel which detects a touch input of a touch input tool having a conduction characteristic of a finger of a body or a similar conduction characteristic, and more specifically, to a touch screen panel which differently arranges areas of sensor patterns mounted on a touch panel to have a uniform intensity of a touch signal received by a touch drive IC. According to the touch screen panel, a uniform touch signal can be outputted regardless of a position of the touch screen panel, and ultimately accurate touch coordinates can be calculated.

Description

A touch screen panel {TOUCH SCREEN PANEL}

The present invention relates to a touch screen panel for detecting an electrostatic touch input of a finger or a touch input tool having similar conductive characteristics, and more particularly, to a touch screen panel in which an area of a sensor pattern mounted on a touch panel is arranged differently, This is a touch screen panel that can uniformize the size of the touch signal received from the IC.

Generally, 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), or an active matrix organic light emitting diode (AMOLED) And is an input device that generates a signal corresponding to a position when an object such as a finger or a pen is touched. The touch screen panel is used in a wide range of fields such as a small portable terminal, an industrial terminal, and a DID (Digital Information Device).

Conventionally, various types of touch screen panels have been disclosed, but resistance type touch screen panels having a simple manufacturing process and a low manufacturing cost have been widely used. However, since the resistance type touch screen panel has low transmittance and must be applied with pressure, it is inconvenient to use, and it is difficult to recognize multi-touch and gesture, and detection error occurs.

On the other hand, capacitive touch screen panels are increasingly penetrating the market because they have high transmittance, can recognize soft touch, and have good multi-touch and gesture recognition.

1 shows an example of a conventional capacitive touch screen panel. 1, a transparent conductive film is formed on the upper and lower surfaces of a transparent substrate 2 made of plastic or glass, and metal electrodes 4 for voltage application are formed on each of four corners of the transparent substrate 2. The transparent conductive film is formed of a transparent metal such as ITO (Indium Tin Oxide) or ATO (Antimony Tin Oxide). The metal electrodes 4 formed at the four corners of the transparent conductive film are formed by printing with a conductive metal having a low resistivity such as silver (Ag). A resistor network is formed around the metal electrodes 4. The resistance network is formed with a linearization pattern for uniformly transmitting a control signal to the entire surface of the transparent conductive film. A protective film is coated on the transparent conductive film including the metal electrode 4.

When a high frequency AC voltage is applied to the metal electrode 4, the electrostatic touch screen panel is spread over the front surface of the transparent substrate 2. At this time, when the transparent conductive film on the upper surface of the transparent substrate 2 is lightly touched with the finger 8 or the conductive touch input tool, a certain amount of current is absorbed into the body, and the current sensor incorporated in the controller 6 senses a change in current, The touch points are recognized by calculating the amount of current in each of the metal electrodes 4.

However, since the electrostatic touch screen panel as shown in FIG. 1 is a method of detecting the magnitude of the minute current, an expensive sensing device is required, so that the price rises and multi-touch which recognizes a plurality of touches is difficult.

In order to overcome such a problem, a capacitive touch screen panel as shown in FIG. 2 has been used in recent years. The touch screen panel of Fig. 2 comprises a horizontal linear sensor pattern 5a and a longitudinal linear sensor pattern 5b, and a touch drive IC 7 for analyzing the touch signal. This touch screen panel is a method of detecting the magnitude of the capacitance formed between the linear sensor pattern 5 and the finger 8 so as to scan the linear sensor pattern 5a in the lateral direction and the linear sensor pattern 5b in the longitudinal direction So that a plurality of touch points can be recognized.

However, when the touch screen panel is mounted on a display device such as an LCD, it is difficult to detect a signal due to noise. For example, the common electrode of the LCD is used, and the AC common voltage Vcom is applied to the common electrode in some cases. The common voltage Vcom of the common electrode acts as noise at the touch point detection.

Figure 3 shows an embodiment in which a conventional capacitive touch screen panel is mounted on an LCD. The display device 200 has a structure in which a liquid crystal is enclosed between the TFT substrate 205 on the lower side and the color filter 215 on the upper side to form the liquid crystal layer 210. The TFT substrate 205 and the color filter 215 are bonded to each other by the sealant 230 at the outer portion thereof. Although not shown, a polarizing plate is attached to the upper and lower sides of the liquid crystal panel, and a BLU (Back Light Unit) is installed thereon.

As shown in the figure, a touch screen panel is installed on the display device 200. The touch screen panel has a structure in which the linear sensor pattern 5 is mounted on the upper surface of the substrate 1. [ On the substrate 1, a protection panel 3 for protecting the linear sensor pattern 5 is attached. The touch screen panel is adhered to an edge portion of the display device 200 via an adhesive member 9 such as DAT (Double Adhesive Tape) or the like, and forms an air gap 9a with the display device 200.

In this configuration, when a touch as shown in FIG. 3 occurs, a capacitance equal to Ct is formed between the finger 8 and the linear sensor pattern 5. As shown in the drawing, a capacitance equal to 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 Cp, which is an unknown parasitic capacitance due to electrostatic capacitive coupling between patterns or manufacturing process factors, also acts. Therefore, a circuit similar to that of the equivalent circuit of Fig. 4 is constructed.

Here, the conventional touch screen panel detects touch by detecting a change amount of Ct, and Cvcom and Cp act as noise in detection of Ct.

In order to remove such noise, an air gap 9a is placed between the touch screen panel and the display device 200 as shown in FIG. Although not shown, ITO or the like is coated on the lower surface of the substrate 1 of the touch screen panel to form a shielding layer, and this shielding layer is grounded to the ground signal.

However, the thickness of the product is increased by the air gap 9a, and quality deterioration occurs. Further, since a separate shielding layer and a manufacturing process are required to constitute a shielding layer, an increase in manufacturing cost is caused. In particular, when the touch screen panel is built in the LCD, it is impossible to manufacture the touch panel because the air gap 9a or the shielding layer can not be formed.

In order to solve such a problem, a touch detection method as shown in Fig. 5 is proposed. Referring to FIG. 5, the sensor pattern of FIG. 5 includes only one sensor pattern 10, not the linear sensor pattern of FIG. This sensor pattern is connected to the point P, which is the touch detection part. The auxiliary capacitor Caux is connected to the point P, the driving voltage is applied through the auxiliary capacitor, and the touch capacitance between the sensor pattern 10 and the touch input tool A touch signal is detected using a phenomenon in which a difference in the magnitude of a voltage or a current detected by the touch detection unit varies according to the magnitude of the touch capacitance when the capacitance Ct is added. By using such a detection method, it is possible to detect a touch signal regardless of noise by detecting a noise generated in a display device such as an LCD and avoiding a point of occurrence of a noise to detect a touch signal. Alternatively, 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, it is possible to detect the touch signal less sensitive to noise in the structure of the touch screen panel as shown in FIG. Do.

FIG. 5 shows a configuration of one sensor pattern, and FIG. 6 illustrates a touch screen panel including a plurality of sensor patterns. Referring to FIG. 6, the structure of the touch-sensitive IC 30 is shown at the bottom of FIG. The touch drive IC 30 includes a driving unit 31, a touch detection unit 14, a timing control unit 33, a signal processing unit 35 and a memory unit 28. The touch drive IC 30 further includes a common voltage detection unit 43 A common voltage receiving unit 45, and an alternating voltage generating unit 37. [ 6, the touch driver IC 30 includes a common voltage detecting unit 43, a common voltage receiving unit 45, and an alternating voltage generating unit 37, The detection unit 43, the common voltage receiving unit 45, or the alternating voltage generating unit 37. [

The drive signal acquired by the touch-drive IC 30 is transmitted to the CPU 40. [ The CPU 40 may be a CPU of the display device, a main CPU of the computer device, or a CPU of the touch screen panel itself. For example, a microprocessor such as an 8-bit or 16-bit microprocessor may be embedded to process a touch signal. Although not shown, the system configuration further includes a power supply for generating a HIGH or LOW voltage of signals for touch input detection.

The microprocessor built in the touch drive IC 30 calculates touch coordinates and recognizes gestures such as a touch point, a zoom, a rotation, a move, and the like, ) And gesture data to the main CPU. Further, it is also possible to calculate the strength of the touch input, calculate only the GUI object that the user desires (for example, a large area is detected) when a plurality of GUI objects are touched at the same time The data can be processed and exported in various forms such as recognition as input.

The timing control unit 33 generates time division signals of several tens of ms or less and the signal processing unit 35 transmits and receives signals to and from the respective sensor patterns 10 through the driving unit 31. The driving unit 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 control section 33 and supplied sequentially or non-sequentially for each sensor pattern 10. The memory unit 28 is for storing an initial value as a signal when no touch occurs in each sensor pattern 10 or storing a signal at the time of occurrence of a touch and stores a unique absolute address for each sensor pattern 10 .

In this way, the memory unit 28 can store temporarily the acquired coordinate values with only one, or store the reference value when no touch occurs. Or a plurality of memory means, so that a reference value at the time of non-touch occurrence and a detection value at the time of occurrence of touch can be separately stored.

Although the illustrated embodiment exemplifies the case where the sensor pattern 10 has a resolution of 4 * 5, since the sensor pattern 10 actually has a higher resolution, the signal may be lost in the course of processing a large number of signals. For example, when the signal processing unit 35 is in the " Busy " state, the touch operation signal may not be recognized and the signal may be missed. The memory unit 28 may prevent the loss of such a signal. For example, the signal processing unit 35 temporarily stores the detected touch signal in the memory unit 28. [ After the entire sensor pattern 10 is scanned, it is determined whether there is a missing signal by referring to the memory unit 28. If there is touch coordinates stored in the memory unit 28 although they are missing in the signal processing process, the signal processing unit 35 recognizes the touch coordinates as normal input.

The common voltage receiving unit 45 directly receives the common voltage information of the common electrode 220 from the display device 200. In this case, information such as the start point, size, rising section and falling section of the common voltage can be obtained very easily, and it is easy for the signal processing section 35 to process the signal in conjunction with the rising section and the falling section of the common voltage. However, the burden of transmitting the common voltage information in the display device 200 occurs.

On the other hand, when the common electrode 220 of the display device 200 has a constant DC level, the alternating voltage generator 37 can forcibly apply the alternating voltage to the common electrode 220. The alternating voltage generator 37 applies an alternating voltage level to the common electrode 220 at a predetermined frequency in accordance with 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 or the like. In this case also, the signal processing section 35 can easily process the signal in conjunction with the rising and falling sections of the common voltage. However, there is a burden of sending a common voltage to the display device 200 side.

However, the common voltage detector 43 automatically detects the common voltage information, so that it is not necessary to exchange information related to the common voltage with the display device. When the common voltage detected by the common voltage detector 43 is an alternating signal, the signal processor 35 avoids a rising edge or a falling edge of the common voltage and applies a driving voltage to be transmitted to the auxiliary capacitor. The common voltage detector 43 may have various circuit configurations.

6, the sensor signal line 22 is typically wired between the sensor patterns 10 in the active area where the sensor pattern 10 is installed, and is connected to the touch-sensitive IC 30. In the case where the touch screen panel is separately provided on the display device or embedded in the display device, the sensor signal line 22 should be formed of ITO or IZO (Indium Zinc Oxide) which is a transparent signal line in at least visible region. The advantage of such a wiring is that the entire signal lines are gathered and are not transmitted to the touch-driving IC 30 through a single passageway, so that a separate area for wiring the signal line is not required. However, since the signal line is disposed between the sensor pattern 10 and the sensor pattern 10, there is a burden of widening the interval between the sensor patterns 10.

On the other hand, in the wiring method of the sensor signal line 22 shown in Fig. 6, the signal line connected to the sensor pattern 10 (1, 1) located at the top end and the sensor pattern 10 (1, 5) Since the length of the connected signal line is different, the wiring resistance of the signal line differs depending on the sensor pattern 10. The width of the sensor signal line 22 to be wired to the upper end is wider than the width of the sensor signal line 22 to be wired to the lower end so that the width of the sensor signal line 22 It is possible to match the wiring resistance of the signal lines with respect to all the sensor patterns 10 by reducing the resistance value and increasing the resistance value by narrowing the wiring width of the sensor signal line 22 wired to the lower end. Therefore, the touch signal detection in the signal processing unit 35 becomes easier. However, in this process, the opposing area of the sensor signal line 22 connected to the display device, the sensor pattern, and the sensor pattern is increased, which leads to an increase in the common electrode capacitance Cvcom and the touch signal detected at each portion of the touch screen panel Thereby causing a problem of non-uniformity. Suppose you have an application (hereafter referred to as an application) that uses the area detected in a touch. These applications may be applications that step on the accelerator pedal of the car or operate the brake by using the change of the touch area when the touch finger is opened and closed. If the detected area of each area of the touch screen panel is changed as described above, the speed or the brake response of the vehicle due to the touch will be changed where the area is detected and the area where the area is detected is detected.

7 is an embodiment of a touch screen panel mounted on the upper surface of the display device 200. As shown in FIG. 7, the display device 200 has a common electrode 220. FIG. In the case of AMOLED, a virtual potential layer capable of forming the common electrode capacitance Cvcom is formed between the TFT substrate and the sensor pattern 10, This is also referred to as a common electrode. The display device 200 may be any of the above-described various types of display devices, and the common electrode 220 may be a Vcom electrode of an LCD or any other type of electrode. The embodiment of FIG. 10 exemplifies an LCD among display devices.

7 has a structure in which a liquid crystal is sealed between a TFT substrate 205 on the lower side and a color filter 215 on the upper side to form a liquid crystal layer 210. [ The TFT substrate 205 and the color filter 215 are bonded to each other by the sealant 230 at the outer portion thereof. Although not shown, a polarizing plate is attached to the upper and lower sides of the liquid crystal panel, and optical sheets constituting BLU (Back Light Unit) and BEF (Brightness Enhancement Film) can be installed together with the BLU.

As shown in the figure, a substrate 50 of a touch screen panel is provided on the display device 200. 7, the substrate 50 is attached to the upper portion of the display device 200 via an adhesive member 57 such as DAT (Double Adhesive Tape) or the like at its outer portion. 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 which is alternated with a predetermined frequency and whose magnitude changes or is DC of a predetermined size. For example, in the case of a small LCD that performs line inversion, the common voltage of the common electrode 220 is alternated as shown in FIG. 5, and the common voltage of the DC level, which is a voltage of a certain magnitude, .

A common electrode capacitance Cvcom is formed between the sensor pattern 10 and the common electrode 220 of the display device 200. As shown in Fig. If a precharge signal is applied to the sensor pattern 10, the common electrode capacitance Cvcom has a predetermined voltage level depending on the charging voltage. Since the one end of the common electrode capacitance Cvcom is grounded to the common electrode 220, the common electrode capacitance Cvcom is grounded by the alternating voltage applied to the common electrode 220 when the common electrode 220 is an alternating voltage. The potential at the sensor pattern 10 which is the other end of the sensor pattern 10 will be alternated and the potential at the sensor pattern 10 will not be alternated when the common electrode is DC.

7, a protective layer 24 for protecting the sensor pattern 10 is shown.

In the structure of FIG. 7, in the circuit diagram of FIG. 5, the touch signal is detected at the point P, that is, the touch detecting section 14 by the following expression.

는 터치검출부(14)에서 검출된 터치신호이며,

는 보조커패시터에 인가되는 하이(HIGH) 레벨 전압이며,

는 보조커패시터에 인가되는 로우(LOW) 레벨 전압이며,

는 보조커패시터정전용량이며,

은 공통전극정전용량이며,

는 기생정전용량이며,

는 터치정전용량임.)(here,

Is a touch signal detected by the touch detection unit 14,

Is a HIGH level voltage applied to the auxiliary capacitor,

Is a low level voltage applied to the auxiliary capacitor,

Is the capacitance of the auxiliary capacitor,

Is a common electrode electrostatic capacitance,

Is a parasitic capacitance,

Is the touch capacitance.)

Referring to Equations (1) and (2), Equation (1) is a touch signal detected by the touch detection unit (14) when no touch is made and Equation (2) That is, the touch signal detected by the touch detecting unit 14 when the finger and the sensor pattern 10 face each other. The difference between the equations (1) and (2) is that when the touch capacitance Ct is generated as a difference in the presence or absence of the touch capacitance Ct in the denominator, The magnitude of the signal to be detected is changed, so that it is possible to calculate the magnitude of the touch signal.

6 and 7, since the width of the sensor signal line 22 varies depending on the position of the sensor pattern 10 in order to equalize the resistance of the sensor signal line 22 when the size of the sensor pattern 10 is constant, The sum of the area of the pattern 10 and the area of the sensor signal line 22 becomes larger as the distance from the touch driver IC 30 increases.

As the area of the sensor pattern 10 and the sensor signal line 22 is wider, the common electrode capacitance Cvcom is increased. Referring to Equation (1) and Equation (2) There is an effect that the magnitude of the signal detected with respect to the signal-receiving side can be reduced.

As a result, the size of a signal detected for the same touch area at a long distance in the touch drive IC is small, and the signal size detected for the same touch area at a short distance in the touch drive IC is large, May be different from each other.

Before the touch occurs, it is necessary to have a uniform output voltage value from the touch drive IC regardless of the position of the sensor pattern by Equation (1). However, as described above, the touch panel having the same size or area of the sensor pattern has a different size of the signal detected by the touch driver IC depending on the position thereof. As a result, It will be an important cause.

Application number: 2012-0109309 Title: Touch detection means, detection method and touch screen panel using driving back phenomenon and display device incorporating such touch screen panel.

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to solve the problems of the conventional capacitive touch screen panel as described above, and the size of the sensor pattern (10) constituting the touch screen panel is different according to positions facing the touch drive IC, (Or a second touch signal value obtained through calculation based on the magnitude of the touch signal) is obtained by varying the size of the touch screen panel There is a purpose.

According to an aspect of the touch screen panel according to the present invention,

1. A touch screen panel for detecting occurrence of touch capacitance by approaching a touch input tool including a finger,

A plurality of sensor patterns forming the touch capacitance (Ct) with the touch input tool, the sensor patterns having different areas according to their placement positions;

A touch detection unit detecting a difference between voltage signals received according to the presence or absence of the touch capacitance to detect touch; And

And a plurality of sensor signal lines connecting each of the sensor patterns and the touch detection unit.

Preferably,

And the area of the sensor pattern varies depending on the distance from the touch detection unit.

Preferably,

And the area of the sensor pattern is increased in proportion to the distance from the touch detection unit.

Preferably,

The width of the sensor signal line is increased in proportion to the length of the sensor signal line and the width of the sensor signal line is increased in proportion to the distance from the touch detection unit.

Preferably,

The spacing between two neighboring sensor signal lines varies depending on the width of a sensor signal line having a larger width of the two neighboring sensor signal lines.

Preferably,

The size of the common electrode capacitance Cvcom at the position where the sensor pattern is disposed is considered to determine the size of the sensor pattern.

Preferably,

And the size of the parasitic capacitance Cp generated in the sensor pattern is considered to determine the size of the sensor pattern.

Preferably,

The sensor signal line and the sensor pattern are formed in a single layer using a single mask as a whole of transparency.

Preferably,

And the entire transparency is ITO.

Preferably,

The sensor signal line is formed of a metal material, and the sensor pattern is formed of a whole transparency.

Preferably,

And the connection pad portion of the sensor signal line connected to the touch detection portion is formed of a metal material.

Preferably,

Wherein the metal material is one of gold, silver and aluminum.

According to the touch screen panel of the present invention, since the magnitude of the touch signal detected at an arbitrary 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, It is possible to supply a stable signal in which the inflection point of the signal does not occur in the embodiment as shown in Fig.

According to the touch screen panel of the present invention, it is possible to output a uniform touch signal irrespective of the position of the touch screen panel, and eventually more accurate touch coordinates can be calculated.

1 is a perspective view illustrating an example of a conventional touch screen panel.
2 is a plan view showing another example of a conventional touch screen panel.
Fig. 3 is a side sectional view showing an example in which the touch screen panel (including the linear sensor pattern 5) of Fig. 2 is installed on the display device.
FIG. 4 is an equivalent circuit diagram for detecting the touch capacitance in FIG.
FIG. 5 is an equivalent circuit diagram for extracting a touch on a panel having sensor patterns 10 separated from the touch screen panel of FIG. 2, respectively.
6 is a schematic view of a touch screen panel in which each sensor pattern 10 is configured separately.
7 is a side cross-sectional view showing an example in which the touch screen panel (each including the separated sensor pattern 10) of Fig. 6 is mounted on the display device.
Fig. 8 is a side sectional view (Fig. 8 (a)) and a plan view (Fig. 8 (b)) of a touch screen panel according to an embodiment of the present invention.
9 is a view schematically showing the configuration of a sensor pattern and a sensor signal line of a touch screen panel according to the present invention.
10 is a view schematically showing a method of calculating a capacitance generated by a touch according to the present invention.
11 is a view showing another embodiment of the sensor pattern and sensor signal line of the touch screen panel according to the present invention.
12 is an embodiment of a method for interconnecting a sensor signal line and a touch drive IC according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

The present invention relates to a touch screen panel, more particularly, to a touch panel mounted on a display device, and is not limited to a specific type. That is, the present invention can be applied to both an on-cell type touch device and an in-cell type touch device.

First, the present invention relates to a touch screen panel having sensor patterns having different areas, and unlike the case where the conventional electrostatic touch screen panel detects touch signals differently according to touch positions, Value.

The display device referred to in the present invention means any one of LCD, PDP, OLED, AMOLED, or any other means for displaying other images. Among the display devices listed above, the LCD requires a common voltage (Vcom) for driving the liquid crystal. For example, a small in-line LCD for a portable device uses a line inversion method in which a common voltage of a common electrode alternates one or a plurality of gate lines in order to reduce current consumption. As another example, the large LCD has a DC level at which the common voltage of the common electrode is constant. As another example, a display device forms a shielding electrode that works in common throughout the panel to shield the external ESD and grounds it to the ground signal. Alternatively, in a liquid crystal display (LCD) of a transverse electric field mode, the common electrode is located on the TFT substrate, and the common voltage detected on the upper surface of the color filter is alternately up and down at the unspecified frequency with reference to the DC level.

In the present invention, in addition to the electrode to which the common voltage Vcom is applied as described above, all the electrodes that commonly function in the display device are referred to as " common electrodes ", and alternate voltage, DC voltage, The voltage in the form of alternating in frequency will be referred to as " common voltage ".

The present invention detects a noncontact touch input of a finger or a touch input tool having similar electrical characteristics. Here, the term " noncontact touch input " means that a touch input tool such as a finger is touched by a substrate at a predetermined distance from the sensor pattern. The touch input tool can be brought into contact with the outer surface of the substrate. In this case, however, the touch input tool and the sensor pattern remain in a non-contact state. Thus, the touch behavior of a finger with respect to a sensor pattern can be expressed in terms of " approach ". On the other hand, since the finger may be in contact with the outer surface of the substrate, the touching action of the finger with respect to the substrate may be expressed by the term " contact ". As used herein, the terms " approach " and " contact "

In addition, the components such as " to " described below are components that perform certain roles, and refer to hardware components such as software or an FPGA (Field-Programmable Gate Array) or ASIC (Application Specific Integrated Circuit). Also, " part " may be included in a larger element or " part, " or may include smaller elements and " parts. &Quot; Also, " part " may have its own CPU.

In the following drawings, thicknesses and regions are enlarged to clearly show layers and regions. Like reference numerals are used for like parts throughout the specification. Whenever a portion of a layer, region, substrate, or the like is referred to as being "on" or "over" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle. Also, the signals described herein are collectively referred to as voltage or current, unless otherwise specified.

Fig. 8 is a side sectional view (Fig. 8 (a)) and a plan view (Fig. 8 (b)) of a touch screen panel according to an embodiment of the present invention. 8A, as the distance of each sensor pattern 10 disposed on the touch screen panel from the touch drive IC 30 increases, the size or area of the sensor pattern 10 increases, The size or area of the sensor pattern 10 becomes smaller.

Specifically, the sensor pattern 10-1 at the farthest distance from the touch-drive IC 30 is much wider than the sensor pattern 10-8 at the nearest position from the touch-sensitive IC 30. Therefore, the sensor pattern 10-1 in the overall size or area is much larger than the sensor pattern 10-8.

8 (b) is a plan view schematically showing a structure of a sensor pattern according to an embodiment of the touch screen panel according to the present invention.

8B, the touch screen panel 800 of the present invention has the largest size of the sensor pattern 10-1 arranged in the row-1 and the proximity to the touch-sensitive IC 30 That is, the sensor pattern is configured so that the sensor pattern becomes smaller as it goes from low 2 -> low 3 -> low 4 -> low 5 -> low 6 -> low 7 -> low 8.

Therefore, the size of the sensor pattern 10-8 configured in row-8 is configured to have the smallest size.

9 is a view schematically showing the configuration of a sensor signal line and a sensor pattern of the touch screen panel 900 according to the present invention.

6, the touch drive IC 30 includes a driving unit 31, a touch detection unit 14, a signal processing unit 47, and the like, and the touch drive IC 30 is connected to a touch screen panel Respectively.

The touch drive IC 30 is connected to a touch screen panel by COG (Chip On Glass) or connected to a flexible circuit board such as a COF (Chip On Film) or an FPC, a sensor signal line 22 Respectively.

As shown in FIG. 9, sensor signal lines 22 are connected to each sensor pattern 10, and each sensor signal line 22 is connected to a touch drive IC. The touch capacitance Ct proportional to the dielectric constant e of the substance existing between the finger and the sensor pattern 10 as shown in Fig. 10 is obtained when the finger is adjacent to the sensor pattern 10 at a distance " d " And the touch capacitance is proportional to the area of the opposing face of the finger 25 and the sensor pattern 10 as well.

For example, in the case of a smartphone having a sensor pattern 10 below a protective glass (protective layer 24 in FIG. 7), it is easy to calculate Ct when the permittivity of glass is about 6 and the facing area is 5 mm x 5 mm It is possible.

In the embodiment of FIG. 9, when the sensor pattern 10 and the sensor signal line 22 are made of a transparent body such as ITO (Indium Tio Oxide), the resistivity of the ITO is relatively large, so that the resistance of the sensor signal line 22 is about several hundred Kohm do.

For example, assuming that the resistivity of ITO is 250? M, the width of the sensor signal line is 30 占 퐉, and the length of the sensor signal line is 10 cm, the resistance of the sensor signal line 22 is about 833 k ?.

The resistance value of the sensor signal line 22 is proportional to the distance between the sensor pattern 22 and the touch driver IC 30, And is proportional to the length of the signal line 22 itself.

9, the resistance value of the sensor signal line 22e connecting the touch drive IC 30 to the sensor pattern 10e in the short distance is equal to the resistance value of the sensor pattern 10a The resistance value of the sensor signal line 22a is smaller than that of the sensor signal line 22a.

Assume that a constant current is applied to the touch correcting capacitance Ct for a unit time in order to detect a touch signal generated by the touch of the finger 25 in the sensor pattern 10. [

A voltage V proportional to the amount of charge Q is formed in the touch capacitance Ct by the classical mathematical expression V = Q / C. At this time, the rise of the voltage is delayed by the resistance of the sensor signal line 22, and the longer the delay time becomes, the larger the resistance is.

Therefore, at the same time, the difference between the rise of the voltage via the sensor signal line 22e with a small resistance and the rise of the voltage via the sensor signal line 22a with a large resistance occurs. Therefore, the same touch capacitance Ct) of the detection voltage. As a result, in the case of multi-touch, it causes the error in the calculation of the accurate touch coordinates.

In order to solve the problem of the conventional touch screen panel as described above, the touch screen panel 900 according to an embodiment of the present invention is configured such that the size (or area) of the sensor pattern and the width of the sensor signal line are not the same, It is characterized in that it is configured differently.

Specifically, according to one embodiment, the size (or area) of the sensor pattern and the width of the sensor signal line are proportional to the distance from the touch-sensitive IC 30.

9, the size of the sensor pattern 10a at a distance from the touch-sensitive IC 30 and the width of the sensor signal line 22a connected to the sensor pattern 10a are determined by the size of the sensor pattern 10e in proximity to the sensor pattern 10a, Is larger than the width of the signal line 22e.

In FIG. 9, 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.

At the same time, the widths of the sensor signal lines connected to the respective sensor patterns are in the order of 22a> 22b> 22c> 22d> 22e.

The wiring width of the sensor signal line 22a is widened to reduce the resistance of the sensor signal line 22a connected to the remote sensor pattern 10a. &Quot; R " which is the magnitude of the resistance of the sensor signal line when the sensor signal line 22 having the wiring width " w " and the length " 1 "

Quot; (3) " widen the wiring width " w " in order to reduce the resistance of the sensor signal line 22. [

9, the wiring width of the sensor signal line 22a connected to the remote sensor pattern 10a will be the widest, and the wiring width of the sensor signal line 22b and the sensor signal line 22c may vary according to the calculation result of Equation (3) It has already been reviewed above that the width gradually becomes narrower.

9, the width of the sensor signal line 22 differs depending on the position. Therefore, the sum of the area of the sensor pattern 10 and the area of the sensor signal line 22 with respect to the sensor pattern 10 having the same area, Are different from each other depending on the position of the pattern (10).

However, the sum of the area of the sensor pattern 10 and the area of the sensor signal line 22 in the same position in the touch-driver IC 30 may be the same or similar. For example, the sum of the areas of the four sensor patterns 10 existing in the same row in FIG. 9 plus the sensor signal line 22 connected to them and the sensor pattern 10 is equal or almost the same .

The area of the sensor signal line 22 connected to the sensor pattern 10 located at the left and right sides of the row is slightly larger than the sensor signal line located at the center when the touch-sensitive IC 30 is located at the center of the touch screen panel The sum of the area of the sensor signal line 22 existing in the same row and the area of the sensor pattern is the same as the sum of the area of the sensor signal line 22 existing in the same row and the area of the sensor pattern, It is safe to say the same.

When the area of the sensor signal line 22 that is examined in the prior art is the same but the area of the sensor signal line 22 is different. When such a touch screen panel is positioned on the top surface of the display device 200 as shown in FIG. 3, Cvcom) are different depending on the position of the sensor pattern 10.

The common electrode capacitance Cvcom is a capacitance formed between the common electrode 220 of the display device and the sensor pattern 10, as shown in Fig. Since the sensor pattern 10 is connected to the sensor signal line 22, the size of the common electrode electrostatic capacitance Cvcom of the sensor signal line 22a at the remote location in the touch drive IC 30 is short Which is larger than the size of the sensor signal line 22e. When the touch signal is detected by the above-described equations (1) and (2), since the common electrode capacitance Cvcom is located in the denominator of the equation, A difference occurs in the detection signals.

The detection signal (10) in the sensor pattern (10) positioned near by the touch-drive IC (30)

The magnitude of the signal detected in 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). (Touch amount) by the size difference of Equation (2), which is the size of a signal when a touch occurs, as compared with the size of Equation (1), which is the size of a signal when no touch occurs .

As shown in FIG. 10, the size of the touch is the area of the finger opposite to the sensor pattern 10. When the finger is pressed and the touch screen panel is pressed hard, the size of the touch signal is increased.

The amount of touch detected by the sensor pattern 10 located close to the touch drive IC is the amount of touch in a state where the common electrode capacitance Cvcom is small. Therefore, referring to Equation (2), the amount of touch is sensitive to a small change amount of the touch capacitance Ct.

For example, assuming that (Vh-Vl) = 10 and Caux = Cvcom = Cp = Ct = 10, the magnitude of the signal detected in the untouched state using Equation (1) is 3.33, The size of the detected signal is 2.5. Therefore, the amount of touch is about (3.33-2.5) /3.33=0.25.

The detection signal (10) in the sensor pattern (10) located at a distance from the touch-drive IC (30)

The magnitude of the signal detected in the sensor pattern 10e located at a remote location in the touch drive IC is obtained by Equation (1) and Equation (2), and the magnitude of the signal detected by the touch detection unit (14) The touch amount due to the same touch capacitance Ct becomes smaller than the touch amount at the close distance. For example, assuming that (Vh-Vl) = 10, Caux = Cp = Ct = 10 and Cvcom = 20, the magnitude of the signal detected in the non- The size of the detected signal is 2. Therefore, the amount of touch is (2.5-2) /2.5=0.2, and the amount of touch decreases with the same touch capacitance (Ct = 10).

In order to adjust the touch amount detected at a long distance to 2.5, which is the same as the touch amount at a short distance, the change amount of the touch capacitance Ct may be increased. For example, assuming that the touch capacitance Ct = 13.3, (Vh-Vl) = 10, Caux = Cp = 10, Cvcom = 20 and Ct = 13.3, The magnitude of the signal detected in Equation 2 is 1.87, and the amount of touch is (2.5-1.87) /2.5=0.25, which is equal to the amount of touch in the vicinity.

In order to make the amount of touch at a distance to be similar to the amount of touch at a distance in this way, the change amount of the touch capacitance Ct must be larger at a distance. For example, if the change in touch capacitance at a short distance is about 0 to 10, the change in Ct at a distance of 0 to 14 will be about 0 to 14 at a medium distance, and the variation amount of Ct at a distance will be about 0 to 14, Can be obtained.

 10, in order to increase the touch capacitance Ct, the facing area between the finger 25 and the sensor pattern 10 must be increased. The touch capacitance Ct determined by the equation of FIG. 10 is applied to Ct in denominators of Equations (1) and (2). Also, the common electrode electrostatic capacitance Cvcom according to different areas of the sensor signal line 22 connected to the sensor pattern 10 arranged at a long distance and at a short distance is determined by the equation shown in Fig. 10, Cvcom in the denominator of Equation (1) and Equation (2). Since the magnitude of the Cvcom varies depending on the distance, the magnitude of the touch capacitance Ct must be changed in order to keep the variation based on Equation (1) and Equation (2). Therefore, the area of the sensor pattern 10 must be widened because the variation of the touch capacitance Ct is required to be larger at a longer distance.

Referring to FIG. 9, the area of the sensor pattern 10 is wider and the area of the sensor pattern 10 is narrower as the distance from the touch drive IC 30 increases. That is, 10a> 10e. The amount of change in the touch capacitance Ct detected by the remote sensor pattern 10 is large and the amount of change in the touch capacitance Ct detected by the sensor pattern 10 in the vicinity is small, It is possible to keep the amount of touch generated at an arbitrary point of the touch screen panel constant.

On the other hand, referring to FIG. 11, parasitic capacitance is generated between the sensor signal line 22b disposed at a long distance and 22a and 22c surrounding the path. Referring to Equation (1) and Equation (2), Cp of the denominator is a parasitic electrostatic capacitance, and various parasitic electrostatic capacitances are generated. One of them is a parasitic electrostatic capacitance generated between the sensor signal lines (22). The parasitic capacitance generated between the sensor signal lines 22 is proportional to the opposing area " A " in inverse proportion to the opposing distance " d " The larger the opposing length is, the larger the parasitic capacitance Cp becomes.

Therefore, since the parasitic capacitance Cp is larger in the sensor signal line 22 disposed at a long distance, the wiring width of the sensor signal line 22 should be wider as the distances increase. For example, 22b of Fig. 11 should be as wide as possible to the width of " a "

It is desirable that the distance between the sensor signal line and the sensor signal line is wider as the distance increases, so that the intervals between the sensor signal lines may be different from each other. However, in the touch drive IC, the sensor signal line 22 connecting the sensor pattern 10 at the same distance can maintain the same distance from the sensor signal line around the sensor signal line 22, The magnitude of the parasitic capacitance Cp generated in the sensor signal line 22 connected to the sensor pattern 10 can be kept constant.

Referring to Equations (1) and (2), in order to keep the amount of touch constant for each position of the TSP (touch screen panel), it is necessary to refer to the amount of change of the common electrode capacitance (Cvcom) But also the amount of change in position (in TSP) of the parasitic capacitance Cp generated in the sensor signal line 22 should be referred to.

Referring to FIG. 6, twenty sensor signal lines 22 are connected to the touch drive IC 30, and the touch drive IC 30 is mounted on a COF, COF, or FPC And is connected to the sensor signal line 22.

At this time, when the number of the sensor signal lines 22 increases and the pitch of the sensor signal line connected to the touch drive IC 30 becomes narrow, the sensor signal line and the touch drive IC are connected using the ACF.

The criterion for determining the size of the sensor pattern according to an embodiment of the present invention may be the size of the common electrode capacitance Cvcom at the position where the sensor pattern is disposed.

In another embodiment, the criterion for determining the size of the sensor pattern may be the magnitude of the parasitic capacitance Cp generated in the sensor pattern.

Since it is ideal to keep the factors included in all mathematical expressions except for the presence or absence of the touch capacitance Ct irrespective of the position of the sensor pattern, as discussed in Equations (1) and (2) The values of the common electrode capacitance Cvcom and the parasitic capacitance Cp must be considered in determining the size of the common electrode capacitance Cvcom.

12 shows an embodiment of a method for interconnecting a sensor signal line 22 formed in a TSP and a touch drive IC having a COF package.

12, the sensor signal line 22 and the sensor pattern 10, which are not shown, are formed of a single mask of transparency such as ITO or the sensor pattern 10 is made of the entire transparency, And may be made of metal such as silver (Ag), gold (Au), or aluminum (Al).

In the case where the sensor signal line 22 is formed of a transparent body made of ITO or the like, the ACF is used to connect (bond and bond) with the touch drive IC 30 having a COF package. The connection pad 1200 of the TSP and the COF 1300 are energized.

In this structure, when aligning the opposite pads of the COF with the connection pad composed of the entire transparency, it is difficult to align the COF with the pad because the pad composed of the entire transparency is not visible. In addition, the conductive ball may break the entire transparency of the connection pad, which may cause a reliability problem that causes a problem in the signal flow.

In order to solve this problem, it is preferable that the connection pad unit 1200 is coated with a metal component such as gold, silver, or aluminum.

Referring to FIG. 12, the " connection pad " part includes a metal component and the metal component is positioned above or below the transparent part constituting the sensor signal line 22. [ When the metal component is located above the entire transparency constituting the sensor signal line 22, the metal pattern is formed by using the metal mask after the sensor pattern 10 and the sensor signal line 22 are formed with the transparency as a whole And a metal pad is formed with a metal mask, and then the sensor pattern 10 and the sensor signal line 22 are formed on the entire surface of the metal pad with transparency as a whole.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Will be clear to those who have knowledge of.

10: sensor pattern 12: charging means
14a: ADC 22: sensor signal line
25: finger 28: memory part
30: Touch drive IC 31: Driving part
33: timing control section 35: signal processing section
37: alternating voltage generation unit 40: CPU
43: common voltage detecting unit 47: selector
50: substrate 57: adhesive member
58: Air gap
200: Display device 205: TFT substrate
210: liquid crystal layer 215: color filter
220: common electrode 230: sealant

Claims (8)

1. A touch screen panel for detecting occurrence of a touch capacitance by approaching a touch input tool including a finger,
A plurality of sensor signal lines formed on a first substrate and connected to each of a plurality of sensor patterns forming a touch capacitance (Ct) with the touch input tool;
A touch driver IC formed on a second substrate for detecting a difference between voltage signals received according to the presence or absence of the touch capacitance to detect touch; And
And a plurality of connection pads, one end of which is connected to each of the sensor signal lines, and the other end of which is connected to each of a plurality of connection terminals arranged in the touch drive IC. The method according to claim 1,
Wherein the second substrate is a flexible substrate, the substrate being a COF (Chip On Film) or an FPC (Flexible Printed Circuit). The method according to claim 1,
Wherein the sensor signal line is formed of a transparent conductor. The method of claim 3,
Wherein the connection pad is formed by coating a part of the sensor signal line with a metal material. The method of claim 3,
Wherein the connection pad is located above or below the sensor signal line. The method of claim 4,
Wherein the metal material is one of silver (Ag), gold (Au), and aluminum (Al). The method of claim 4,
Wherein the connection pad is visible. The method according to claim 1,
Wherein the sensor pattern has a different area depending on the arrangement position.

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