KR100936369B1 - Display device having built-in touch input means - Google Patents

Display device having built-in touch input means Download PDF

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Publication number
KR100936369B1
KR100936369B1 KR1020090063337A KR20090063337A KR100936369B1 KR 100936369 B1 KR100936369 B1 KR 100936369B1 KR 1020090063337 A KR1020090063337 A KR 1020090063337A KR 20090063337 A KR20090063337 A KR 20090063337A KR 100936369 B1 KR100936369 B1 KR 100936369B1
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South Korea
Prior art keywords
touch
signal line
switching element
control signal
signal
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KR1020090063337A
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Korean (ko)
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이성호
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이성호
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412Digitisers structurally integrated in a display
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416Control or interface arrangements specially adapted for digitisers
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device with a built-in touch input means, and includes a lower substrate 20 on which a pixel portion 22 composed of pixels and pixel electrodes is disposed, and an upper substrate 30 spaced apart from the lower substrate 20. A display device comprising: a plurality of first signal lines (32), second signal lines (33) and on / off control signal lines (34) disposed on an upper surface or a lower surface of the upper substrate (30); It is formed in a region where a plurality of active regions where a touch is made on the upper or lower surface of the upper substrate 30 is divided between the first signal line 32 and the second signal line 33 in each divided region. A three-terminal first switching element 41 and a second switching element 42 having a gate terminal connected to the on / off control signal line 34, and the first switching element 41 and the second switching element 42. A touch cell 60 having a conductive pad 50 connected to a connection point of the touch cell 60; And an on / off control signal applied to the on / off control signal line 34 to control the first switching element 41 and the second switching element 42 on / off, and the first signal line 32 and Position detection signal is transmitted / received through the second signal line 33, and is formed between the touch means 25 and the conductive pad 50 when the touch means 25 is contacted or approached from the outside of the upper substrate 30. It is characterized in that it comprises a; touch position detection unit 70 for detecting the contact or approach of the touch means 25 by the capacitance to obtain a coordinate signal of the touch cell 60 in which the touch input is generated. According to the present invention, while the touch component is embedded in the display device, no increase in thickness of the display device occurs, almost no decrease in transmittance of the panel, a very good yield of the product, and touch input detection affect the screen display of the display device. There is no effect, it is possible to greatly shorten the manufacturing process.

Description

Display device having built-in touch input means

The present invention relates to a display device with a built-in touch input means, and more particularly, a touch component is installed on an upper substrate of the display device so that an increase in thickness of the display device does not occur, and the touch component is the same as the component of the display device. The present invention relates to a display device in which a touch input means having a new structure that can be disposed on a line and prevents a decrease in transmittance is incorporated.

In general, the touch 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), and a finger or a pen. It is one of the input devices to generate a signal corresponding to the position when the object of contact. Touch panels are used in a wide range of fields, such as small portable terminals, industrial terminals, and digital information devices (DIDs).

As mentioned above, the conventional touch panel is installed in addition to the upper surface of the completed display device and manufactured separately from the display device. As described above, the conventional technology in which the touch panel is added to the upper surface of the display device and installed therein causes an increase in the thickness of the entire device, thereby lowering the product competitiveness. Cause problems. In addition, a process of manufacturing the display device and the touch panel in separate processes and assembling two different devices causes an increase in manufacturing cost.

On the other hand, in recent years, attempts have been made to embed touch components in a display device in order to alleviate the above problems. For example, in the case of LCD, signal lines for detecting touch input are wired on a TFT substrate, which is a lower substrate, and a plurality of sensing electrodes connected to the signal lines and spaced apart from each other are formed. On the color filter substrate, which is the upper substrate, a common electrode is formed over the entire lower surface of the color filter substrate, and is provided so as to protrude downward from the protrusion connected to the common electrode. In addition, when a pressure is applied to the upper substrate, the protrusion is detected to contact the sensing electrode to detect a touch input. Such a display device may install touch components using a TFT substrate and a color filter substrate, thereby embedding the touch components without increasing the thickness of the display apparatus, and manufacturing the display apparatus and the touch input apparatus together in one manufacturing process. .

However, in a display device such as an LCD or an AMOLED, a gate line and a data line are disposed on a TFT substrate, which is a lower substrate, and components such as pixels, pixel electrodes, and TFTs are mounted. Therefore, when the touch components are installed on the lower substrate of the display device as described above, the components on the lower substrate have a very complicated structure. This complicates the manufacturing process, greatly lowers the yield, and comes with various problems such as poor insulation between the components.

In addition, as the components for displaying the screen and the components for detecting the touch input are mounted together on the lower substrate, the transmittance of the panel is greatly reduced. Furthermore, forming protrusions electrically connected to the common electrode over a plurality of areas on the lower surface of the upper substrate also causes an increase in process cost and a decrease in yield.

In addition, depending on the type of display device, liquid crystal, organic material, plasma gas, etc. are sealed in the display device. Since the display device detects a touch input by using the bending of the upper substrate, cracks are formed at the actual part of the display device. Is highly likely to occur, the durability of the display device is greatly weakened, and the screen flickers when a touch input occurs.

In addition, by forming a protrusion projecting downward on the lower surface of the upper substrate, the manufacturing process of the upper substrate is also complicated. In addition, the display device as described above must maintain a strict cell gap between the protrusion of the upper substrate and the sensing electrode of the lower substrate. For this purpose, an additional process of forming a planarization layer on the upper surface of the lower substrate is required. Despite the use of the planarization layer, it is very difficult to strictly maintain the cell gap between the protruding portion and the sensing electrode, causing problems such as a decrease in yield, a shortened life, and a loss of the touch signal.

According to the present invention, since the touch input means is built in the display device and the display device and the touch panel can be manufactured together in one manufacturing process, the thickness increase of the display device is not generated and the touch input is not bent without bending the upper substrate of the display device. The present invention provides a display device with a built-in touch input means, which has a low yield and has a low yield. There is a purpose.

One embodiment of the present invention for achieving the above object, the lower substrate 20, the pixel portion 22 is composed of a pixel and a pixel electrode is disposed, and the upper substrate spaced apart from the lower substrate 20 ( 30. A display device comprising: a plurality of first signal lines (32), second signal lines (33), and on / off control signal lines (34) disposed on an upper surface or a lower surface of the upper substrate (30); It is formed in a region where a plurality of active regions where a touch is made on the upper or lower surface of the upper substrate 30 is divided between the first signal line 32 and the second signal line 33 in each divided region. A three-terminal first switching element 41 and a second switching element 42 having a gate terminal connected to the on / off control signal line 34, and the first switching element 41 and the second switching element 42. A touch cell 60 having a conductive pad 50 connected to a connection point of the touch cell 60; And an on / off control signal applied to the on / off control signal line 34 to control the first switching element 41 and the second switching element 42 on / off, and the first signal line 32 and The position detection signal is transmitted and received through the second signal line 33, and the touch means 25 and the conductive pad 50 are contacted when the touch terminal 25 is touched or approached from the outside of the upper substrate 30. A touch position detection unit 70 for detecting a contact or approach of the touch means 25 by the capacitance formed, and obtaining a coordinate signal of the touch cell 60 in which the touch input has occurred; A display device with built-in means is provided.

According to another embodiment, the display device is any one of LCD, PDP, OLED, AMOLED.

According to another embodiment, the lower substrate 20 is a TFT substrate in which TFTs are disposed for each unit pixel, and gate lines and data lines for applying on / off control signals and data signals are disposed on the TFTs.

According to yet another embodiment, the first switching element 41 and the second switching element 42 are TFTs.

According to another embodiment, the first switching device 41 is a release first switching device 41a in which on and off operations are reversed with the second switching device 42 by the same on / off control signal. In this heterogeneous first switching element 41a, an input terminal and an output terminal are connected between the first signal line 32 and the conductive pad 50, and a gate terminal is connected to the on / off control signal line 34. The switching element 42 has an input terminal and an output terminal connected between the conductive pad 50 and the second signal line 33, and a gate terminal connected to the on / off control signal line 34. The scan pulse is sequentially applied to each of the on / off control signal lines 34.

According to another embodiment, the first switching element 41 is the same first switching element 41b in which on and off operations are performed in the same manner as the second switching element 42 by the same on / off control signal. The on / off control signal line 34 is provided with a first on / off control signal line 34a and a second on / off control signal line 34b, respectively, and the same type of first switching element 41b has an input terminal. And an output terminal are connected between the first signal line 32 and the conductive pad 50, a gate terminal is connected to the first on / off control signal line 34a, and the second switching element 42 is an input terminal and an output terminal. It is connected between the self-conductive pad 50 and the second signal line 33, the gate terminal is connected to the second on / off control signal line 34b, the touch position detector 70 is the first on / off control Scan pulses are sequentially applied to each of the signal line 34a and the second on / off control signal line 34b.

According to another embodiment, a capacitor 55 is connected between the conductive pad 50 and the second on / off control signal line 34b.

According to another embodiment, a plurality of auxiliary signal lines 36 are further disposed on one surface of the upper substrate 30, and a capacitor 55 is connected between the conductive pad 50 and the auxiliary signal lines 36.

According to another embodiment, a plurality of sensing touch cells 61 are further formed on the upper or lower surface of the upper substrate 30 to measure the reference signal for comparison with the position detection signal output to the second signal line 33. do.

According to another embodiment, the sensing touch cell 61 is formed in the same manner as the touch cell 60 with the conductive pad 50 removed.

According to a further embodiment, the sensing touch cell 61 is provided for each area divided into a plurality of upper substrates 30, and the reference signal measured from the sensing touch cell 61 in each area is the It is used as a reference signal for comparing the position detection signals.

According to another embodiment, a light blocking layer for blocking light is formed on the first switching element 41 and the second switching element 42.

According to another embodiment, a transparent insulating film for protecting the touch cell 60 is coated on the upper or lower surface of the upper substrate 30.

According to another embodiment, the touch position detector 70 digitally detects the position detection signal received through the second signal line 33.

According to another embodiment, the touch position detector 70 resets the touch cell 60 by blocking the application of the on / off control signal or the position detection signal to the touch cell 60 where the touch position detection is completed.

According to yet another embodiment, the touch switch 60 electrically partitions the connection of the second switching elements 42 or time-divisions a signal applied to the second switching elements 42 to recognize the multi-touch input. do.

According to another embodiment, the touch position detection unit 70 further includes a memory means 75 having addresses corresponding to the coordinate values of the touch cell 60, and the position detection signal from the second signal line 33. When receiving the data stored in the corresponding address of the memory means 75, the coordinate value of the corresponding touch cell 60.

According to another embodiment, the unit pixels are arranged in a matrix form on the lower substrate 20, and the touch cell 60 of the upper substrate 30 is disposed at a resolution having a real magnification compared to the unit pixels.

According to another embodiment, at least one signal line among the signal lines for detecting touch input disposed on the upper substrate 30 may be at least one signal line among the signal lines for screen display disposed on the lower substrate 20. Is disposed on the same vertical line as.

According to another embodiment, at least one signal line among the signal lines for detecting touch input disposed on the upper substrate 30 may be at least one signal line among the signal lines for screen display disposed on the lower substrate 20. Is arranged in an oblique direction with respect to.

The display device with a built-in touch input means includes a touch component capable of detecting a non-contact touch input on an upper substrate of two substrates constituting the display device, and is formed between the conductive pad and the touch means that constitute the touch cell. And use the virtual capacitance to detect the touch input. In the present invention, the thickness increase of the display device is hardly generated, and the display device and the touch panel may be manufactured together in one manufacturing process. In addition, since touch components mounted on the upper substrate are similar to the TFT manufacturing process of the lower substrate, the manufacturing process of the lower substrate (TFT substrate), which has already been proven to be reliable and mass-produced, can be partially borrowed to simplify the manufacturing process. And the manufacturing cost can be greatly reduced. In addition, the components for screen display are concentrated on the lower substrate, and the components for touch input detection are concentrated on the upper substrate, thereby simplifying the multilayer structure of the signal lines and making the transmittance very good. It is possible to increase the degree of freedom and improve product yield. In addition, by detecting the touch input without bending the substrate, it is possible to safely protect the liquid crystal or organic substances encapsulated in the two substrates for screen display, and to increase the durability, and even shorten the life despite the built-in touch input means. There is an effect that does not occur.

In addition, various embodiments provided in the present invention have the effect of more stable signal processing and multi-touch input recognition.

In addition, the present invention has the effect of adjusting the output slope of the capacitive touch cell by the charge sharing effect between the added capacitor and the virtual capacitor by adding a capacitor of the appropriate capacitance in each touch cell.

In addition, the present invention provides a sensing touch cell for generating a reference signal when detecting a touch input, thereby reducing compensation due to temperature change and measuring error of the touch signal and increasing signal detection accuracy.

In addition, the present invention is provided by dividing the sensing touch cell into a plurality of regions, and using the signal received from the sensing touch cell as a reference signal of the region, thereby minimizing the measurement error caused by the wiring resistance of the signal line. There is.

In addition, the present invention has an effect of forming a light shielding layer on the switching element, preventing the switching element from malfunctioning in response to external light.

In addition, the present invention has the effect of forming a transparent insulating film to protect the touch cell, to prevent damage to components such as conductive pads, and to secure a stable gap for capacitance formation between the touch means and the conductive pad.

In addition, the present invention can digitally detect the position detection signal received by the second signal line, so that the signal processing is fast, and the components are not required, such as amplifiers or signal converters, so that the device can be made slimmer and manufacturing cost can be reduced. It has an effect.

In addition, the present invention temporarily stores the position detection signal in the memory means, and if the amount of signal processing in the CPU is not recognized in real time, the position detection signal received in real time, the signal stored in the memory means can be called and processed, There is an effect that can prevent the loss of.

In addition, the present invention by placing the "signal line for detecting touch input" on the upper substrate on the same vertical line as the "signal line for screen display" disposed on the lower substrate, the signal for screen display and the touch input detection There is an effect of preventing the moiré phenomenon caused by the interference between signals.

Further, the present invention arranges the "signal line for detecting touch input" disposed on the upper substrate in a diagonal direction with respect to the "signal line for displaying the screen" disposed on the lower substrate, thereby to detect the signal for the screen display and the touch input detection. There is an effect of preventing the moiré phenomenon caused by the interference between signals.

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

In the drawings, thicknesses or regions are enlarged in order to clearly express various layers and regions. The same reference numerals are used for similar parts throughout the specification. When a portion of a layer, region, substrate, etc. is said to be "on" or "top" another portion, this includes not only the case where the other portion is "directly above" but also another portion in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

In addition, in the following description, signal lines (for example, gate lines and data lines in the case of LCD or AMOLED), which are basically provided in the display device, are collectively referred to as "signal lines for screen display". When signal lines (for example, first signal lines, second signal lines, etc.) added for detecting a touch input are collectively referred to as "signal lines for detecting touch input". If only referring to the "signal line", it may be understood that the signal line for the screen display and the signal line for the touch input detection.

In addition, in the embodiments described below, the switching element may be replaced with "TFT", and the same reference numerals will be used for the switching element and the TFT.

First, the present invention relates to a display device such as an LCD, a PDP, an OLED, an AMOLED, and the like, and a display device having a touch input means built in the display device. The general configuration of the display device in the present invention is no different from the known display device, and detailed descriptions thereof will be omitted for those configurations that are obvious to those skilled in the art.

In the present invention, the components constituting the touch input means are installed on the upper substrate of the display device. Unlike the conventional method of acquiring a touch signal when two substrates are bent and touched by touch pressure, the touch input means of the present invention conducts a three-terminal switching element such as TFT (Thin Film Transistor) on a single substrate. The touch means and the conductive pad are formed when a part of a body such as a finger, an iron writing instrument, an electronic pen for generating a predetermined electrical signal, or other similar touch means is approached to the conductive pad in a non-contact manner by forming a touch cell composed of a pad. The touch signal is acquired by detecting the charge accumulated in the virtual capacitor formed therebetween.

Here, the touch cell installed on the upper substrate includes a TFT and a conductive pad, and is arranged in a matrix form. The design of the touch cell is to install TFTs for each unit pixel in the lower substrate of the display device, that is, the TFT substrate. It is similar to the design form. That is, the process of installing the touch component on the upper substrate may partially borrow the manufacturing process of the TFT substrate from the manufacturing process of the display device, in which product reliability and mass production have already been verified. Therefore, more reliable manufacturing process and product reliability can be expected in embedding the touch input means in the display device. Of course, the components for screen display such as TFT and pixel electrodes installed on the lower substrate and the components for detecting touch input such as TFT and conductive pads installed on the upper substrate are similar in appearance, but the actual functions and The action is different.

In the present invention, the touch cell formed on the upper or lower surface of the upper substrate is formed by a plurality of divided regions of the active region in which the touch input is made, and in each divided region, a pair of three-terminal switching elements and switching elements A conductive pad is connected to the connection point. The touch position detector applies the on / off control signal to the gate terminals of the two switching elements through the on / off control signal line. In addition, the touch position detector transmits and receives a position detection signal through the first signal line and the second signal line. The position detection signal is input to the source terminal (or "input terminal") of at least one switching element and output to the drain terminal (or "output terminal") of the other switching element. If a voltage is applied to the conductive pad when the body or a similar touch means approaches the conductive pad, charges are accumulated by a virtual capacitor formed between the conductive pad and the touch means. The touch signal is acquired while being turned on or off. For example, the touch position detector may detect, in an analog manner, that the magnitude of the current or the flowing time is changed by the capacitance between the touch means and the conductive pad. Preferably, the touch position detector may digitally detect the high / low level of the voltage or current signal output from the switching element. In the following description, the latter digital detection method will be described.

Although not mentioned in the present embodiments, each of the touch cells arranged in a matrix form has at least two switching elements and conductive pads, and controls the switching elements on / off using an on / off control signal line, and at least If two signals are used to transmit and receive a signal for position detection and obtain a touch signal by a capacitance formed between the touch means and the conductive pad, this will be considered to be included in the technical idea of the present invention.

1 is an exploded perspective view showing an external structure of a display device according to the present invention, and schematically illustrates a general configuration of a display device. Referring to this, the display device of the present invention is largely composed of two substrates as in the general display device. In the case of an LCD, the lower substrate 20 is a TFT substrate on which pixels and pixel electrodes are disposed on an upper surface, TFTs are disposed on a unit pixel, and gate lines and data lines are disposed, and the upper substrate 30 is a color filter. Is a color filter substrate on which the liquid crystal is sealed between the lower substrate 20 and the upper substrate 30 to form a liquid crystal layer. In the case of AMOLED, the lower substrate 20 is a TFT substrate similar to an LCD, and the upper substrate 30 is an encapsulation substrate for encapsulation of an organic material. The lower substrate 20 and the upper substrate 30 are made of a light transmissive material such as glass, plastic, or film. The lower substrate 20 and the upper substrate 30 may be formed of a substrate having a multi-layered structure instead of a single substrate. For example, the upper substrate 30 may be configured by mounting touch components including the touch cell 60 on a film and bonding the film to a glass or plastic substrate.

As shown, the gate IC 26 and the source IC 28 are mounted on the edge portion of the lower substrate 20. The gate IC 26 applies a gate signal to a TFT provided for each unit pixel, and the source IC 28 applies a data signal to each TFT. The gate IC 26 and the source IC 28 are drive ICs for controlling signals for screen display, and are mounted in the form of a chip on film (COF) or a chip on glass (COG) at the edge of the lower substrate 20. do.

The above configuration is the same as the general configuration of a conventional display device. In this case, the display device of the present invention applies an on / off control signal to the signal receiving and receiving IC 71 for transmitting and receiving the position detection signal and the gate terminal of the switching element in order to control signals for detecting a touch input, as shown. On / off control IC 72 is further provided. As illustrated, the signal receiving / receiving IC 71 and the on / off control IC 72 are mounted in an edge portion of the upper substrate 30 in the form of COF or COG. Although the signal receiving and receiving IC 71 and the on / off control IC 72 are shown as separate ICs in the illustrated embodiments, the two ICs 71 and 72 may be integrated and mounted as a single IC. In addition, the signal receiving / receiving IC 71 and the on / off control IC 72 may be mounted at the edge portion of the lower substrate 20 or may be integrated with the gate IC 26 or the source IC 28 of the lower substrate 20. It may be installed. In this case, the signal transmission and reception IC 71 and the on / off control IC 72 of the lower substrate 20 are connected to the upper substrate 30 by using a signal transmission medium such as a flexible printed circuit (FPC).

2 shows an example in which an embodiment of the present invention is applied to an active organic light emitting display device (AMOLED). In the AMOLED, the lower substrate 20 is a TFT substrate, and pixels and pixel electrodes are disposed on the upper surface of the TFT substrate to form the pixel portion 22. In addition, the upper substrate 30 is an encapsulation substrate for encapsulating the organic material deposited on the upper surface of the lower substrate 20. As shown in the drawing, the lower substrate 20 and the upper substrate 30 are sealants 24 (Sealant). It is sealed by). Although not shown, the pixel unit 22 includes a plurality of unit pixels arranged in a matrix, and TFTs for switching image signals are provided in each unit pixel. In addition, a plurality of gate lines and data lines are insulated from each other and intersect each other on the upper surface of the lower substrate 20, and a common power line is disposed in parallel with the data lines. In the structure of the AMOLED, the upper substrate 30, which is an encapsulation substrate, is provided with touch components as in the following embodiments. On the other hand, AMOLED does not require a separate light source as a self-light emitting device, but when the present invention is applied to the LCD, a BLU (Back Light Unit) will be installed behind the lower substrate 20. In addition, the present invention is not limited to LCD or AMOLED, but is applicable to various display devices having a structure in which at least two substrates are spaced apart from each other.

Prior to describing a specific embodiment of the present invention, the principle of detecting a non-contact touch input in the present invention will be briefly described. 3 shows an example in which a virtual capacitor is formed between the conductive pad and the body when a finger approaches the conductive pad in the present invention. In FIG. 3, the touch means 25 is a finger of the body. Referring to FIG. 3, when the finger approaches the conductive pad 50, if the finger and the conductive pad 50 face each other with an area A with a distance of d, the finger as shown in the right equivalent circuit and equation of FIG. 3. The capacitance C is formed between the conductive pad 50 and the conductive pad 50. At this time, the ground serves as a virtual ground (Ground) to the body. Therefore, when a voltage is applied to the conductive pad 50, electric charges may accumulate in the capacitance C formed between the finger and the conductive pad 50. In the following, the capacitance C is designated as a virtual capacitor.

In one embodiment, when the body contacts the conductive pad 50, a capacitance of 10 to 20 pF is formed, and when the body approaches the conductive pad 50 in a non-contact state, the conductive pad 50 and the body between the conductive pad 50 and the conductive pad 50 are in contact with each other. A capacitance of 2 to 5 pF may be formed according to the dielectric constant of the object having the dielectric constant e. In the present embodiment, the touch pad 25 having a body or similar conductive properties may be touched or lightly touched by the conductive pad 50 by using the capacitance characteristic formed between the conductive pad 50 and the body. Recognize.

In an embodiment of the present invention, a certain distance must be maintained between the conductive pad 50 and the body. That is, since the touch means 25 and the conductive pad 50 are in a non-contact state, the term “access” is used for the touch means 25 and the conductive pad 50. If the touch cell 60 is installed on the lower surface of the upper substrate 30, when the touch means 25 is in contact with the upper surface of the upper substrate 30, the touch means 25 is spaced apart from the conductive pad 50. Keep it. In this case, since the touch means 25 is spaced apart from the conductive pad 50 but is in contact with the upper substrate 30, the term “contact” is also used at the same time. In this specification, "contact" and "access" are commonly used as the meaning above.

Figure 4 is a schematic view showing an embodiment of an upper substrate in the present invention. Referring to this, a plurality of first signal lines 32 for applying a position detection signal and a plurality of second signal lines 33 for outputting a position detection signal are formed on an upper surface or a lower surface of the upper substrate 30. A plurality of on / off control signal lines 34 for on / off control of the switching element are arranged. The first signal line 32 is a line for forming a capacitance between the conductive pad 50 and the touch means 25 by applying the position detection signal of the first signal (D1-D3) to the touch cell 60, The second signal line 33 is a line for receiving the position detection signals S1-S3, and the on / off control signal line 34 is a gate of two switching elements 41 and 42 constituting the unit touch cell 60. It is a line for applying the on / off control signal SW1-SW3 to the terminal. The first signals D1-D3, which are position detection signals, are voltages in one embodiment.

In the illustrated embodiment, although the first signal line 32 and the on / off control signal line 34 are wired in parallel, the on / off control signal line 34 and the second signal line 33 are cross-wired. This is merely shown to help the understanding of the present invention, and each of the signal lines 32, 33, and 34 may be wired side by side, cross wired, or wired in diagonal lines.

As shown, a first switching element 41 and a second switching element 42 are provided between the first signal line 32 and the second signal line 33, and the first switching element 41 and the second switching element are provided. The conductive pad 50 is connected to the connection point of the element 42 to form the unit touch cell 60. In the present invention, the first switching device 41 may be a switching device of the heterogeneous type or the switching device of the same type as the second switching device 42. In the embodiment shown in Fig. 4, the first switching element 41 is shown as a heteromorphous first switching element 41a. In another embodiment described later, the first switching element 41 is the same type of first switching element 41b. It is composed of In the following description with reference to FIG. 4, an embodiment in which a heterogeneous first switching element 41a is used as the first switching element 41 will be described.

The two three-terminal switching elements constituting the unit touch cell 60 are preferably TFTs. In the embodiment of FIG. 4, the first TFT 41a, which is a P-type TFT, and the second TFT 42, which is an N-type TFT, The unit touch cell 60 is configured. The P-type TFT is turned off when the on / off control signal applied to the gate terminal is at a high level, and is turned on when it is at a low level. The N-type TFT is switched on when the on / off control signal applied to the gate terminal is at a high level, and is turned off when it is at a low level, and the operating state is opposite to that of the P-type TFT. Although the embodiment of FIG. 4 illustrates that the release first TFT 41a is P-type and the second TFT 42 is N-type, this is only one embodiment, and the release first TFT 41a is N-type and the second TFT ( 42 may be configured as a P type.

As shown, the input terminal of the first release TFT 41a is connected to the first signal line 32, the output terminal is connected to the conductive pad 50, and the input terminal of the second TFT 42 is connected to the conductive pad 50. The output terminal is connected to the second signal line 33. The on / off control signal line 34 is commonly connected to the gate terminals of the first and second TFTs 41a and 42. Of course, the on / off control signal line 34 may be divided into two signal lines having different signal components, and may apply separate on / off signals to the first and second TFTs 41a and 42, respectively.

In the embodiment of Fig. 4, when the voltage of the on / off control signal line 34 is at the low level, the release first TFT 41a is on and the second TFT 42 is off. In addition, the release first TFT 41a transmits a position detection signal applied to the first signal line 32 to the conductive pad 50. Therefore, a capacitance is formed between the conductive pad 50 and the touch means 25 when the touch means 25 generates a non-contact touch input adjacent to the conductive pad 50. Subsequently, when the voltage of the on / off control signal line 34 is converted to the high level, the release first TFT 41a is turned off to cut off the voltage applied to the conductive pad 50. Then, the second TFT 42 is turned on, and the second signal line 33 receives a position detection signal (electric signal such as voltage or current) formed by the capacitance accumulated between the conductive pad 50 and the touch means 25. Transfer to the touch position detection unit 70 through).

5 is a configuration diagram showing another embodiment of the upper substrate. In the above-described embodiment of FIG. 4, one on / off control signal line 34 is commonly connected to two switching elements 41a and 42, and the first TFT 41 is opposite to the second TFT 42 in an operating state. Although it is illustrated that the first TFT 41a is formed, the embodiment of FIG. 5 illustrates that the first TFT 41 is the same type of first TFT 41b as the second TFT 42 and is the gate terminal of the two switching elements 41b and 42. Is an embodiment connected to different on / off control signal lines 34a and 34b, respectively. In the embodiment of Fig. 5, different on / off control signal lines 34a and 34b are connected to the same first TFT 41b and the second TFT 42, respectively, so that the same first TFT 41b and the second TFT 42 are turned on. The on / off can be controlled individually, and the touch signal can be obtained more effectively. In the following embodiment, a case in which the same type first TFT 41b and the second TFT 42 both use the N type TFT will be described by way of example, but the same type first TFT 41b and the second TFT 42 both use the P type TFT. Can also be used.

Referring to FIG. 5, the on / off control signal line 34 of FIG. 4 is divided into a first on / off control signal line 34a and a second on / off control signal line 34a to have different signal components. The first on / off control signal line 34a is connected to the gate terminal of the same first TFT 41b and the second on / off control signal line 34b is connected to the gate terminal of the second TFT 42.

If the same type TFT is used for each touch cell 60 and the connection of the on / off control signal line 34 is disconnected, the manufacturing of the substrate and the processing of the signal can be made easier and the quality can be improved and the touch position can be stably detected. . In the present exemplary embodiment, the touch position detector 70 sequentially applies scan pulses to the on / off control signal lines 34a and 34b to sequentially conduct the first TFT 41b and the second TFT 42. 2 Check the touch position when the TFT 42 is energized. Alternatively, all the same first TFTs 41b are turned on at the same time, and the first signals D1 to D3 are simultaneously applied to all the first signal lines 32 to induce charge with the body. The touch position may be confirmed by sequentially applying the position detection signal to the two signal lines 33.

FIG. 6 is a plan view illustrating a configuration example of the unit touch cell 60 in the embodiment of FIG. 5. Referring to this, the first signal line 32 and the second signal line 33 are wired in the longitudinal direction of the substrate 30, and the first on / off control signal line 34a and the second on / off in the transverse direction. The control signal line 34b is wired. The conductive pad 50 is formed in the touch cell 60.

Here, the conductive pad 50 is a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO), antimony tin oxide (ATO), carbon nanotube (Carbon Nano Tube) on one surface of the upper substrate 30. It is formed by applying. The conductive pad 50 may be installed only in the local area of the touch cell 60, but as shown in FIG. 6, the conductive pad 50 may be installed to have the largest area possible in the touch cell 60. As the area of the conductive pad 50 is wider, the virtual capacitance formed between the touch means 25 and the conductive pad 50 increases, so that a touch signal can be more stably obtained.

Although not shown, a transparent insulating film may be formed on the touch cell 60 including the conductive pad 50. If the touch cell 60 is formed on the upper surface of the upper substrate 30, a transparent insulating film is formed to protect the touch cell 60. The transparent insulating film improves durability of the touch cell 60. First of all, the transparent insulating film allows the touch means 25 to be closer to the conductive pad 50 so that the touch means 25 and the conductive pad 50 can be opposed at very small intervals. Therefore, when the virtual capacitance is formed between the touch means 25 and the conductive pad 50, the distance item of the denominator is reduced to increase the virtual capacitance value and to more stably acquire the touch signal.

Referring to FIG. 6, the gate terminal 45 of the same type first TFT 41b is connected to the first on / off control signal line 34a, and the source terminal 43 is connected to the first signal line 32. The drain terminal 44 is connected to the conductive pad 50. The gate terminal 45 of the second TFT 42 is connected to the second on / off control signal line 34b, the source terminal 43 is connected to the conductive pad 50, and the drain terminal 44 is connected to the second signal line. (33). Each signal line on the substrate 30 is formed of a source metal or a gate metal for each layer. The terminals of each of the TFTs 41b and 42 are formed in a multilayer structure in which a gate metal, a source metal, and amorphous silicon or polycrystalline silicon are insulated by an insulating layer. In order to connect the conductive pad 50 to the drain terminal 44 of the same first TFT 41b and the source terminal of the second TFT 42, the gate terminal of the second TFT 42 is further connected to the second on / off control signal line. In order to connect to 34b, a connection point of a contact hole 46 process using a transparent conductor such as ITO is used.

On the other hand, although not shown, a light blocking layer for blocking light may be provided on the upper surfaces of the TFTs 41 and 42. This is to prevent the respective TFTs 41 and 42 from malfunctioning in response to external light.

4 and 5, it can be seen that the touch cell 60 is shown at a resolution of 3 × 3. Although the touch cell 60 is actually disposed at a very high resolution, the touch cell 60 is shown at a resolution of 3 × 3 in FIG. 4 only for the purpose of understanding the present invention. Embodiments to be described later will be described by illustrating that the touch cells 60 are arranged at a resolution of 3 × 3.

7 is a block diagram illustrating a system configuration of the present invention. Referring to this, the touch position detector 70 is installed at one edge portion or the outside of the upper substrate 30 or the lower substrate 20. As shown, the touch position detecting unit 70 includes a signal receiving and receiving IC 71, an on / off control IC 72, a timing controller 73, a signal processor 74, and a memory means 75. It is composed. In addition, the touch position detection unit 70 may include a power supply terminal 76 to generate power such as on and off of the TFT and position detection signals D1-D3. The power terminal 76 may be located outside the touch position detector 70. The touch signal acquired by the touch position detector 70 is transmitted to the CPU 80 to generate an input signal corresponding to the coordinate.

The signal receiving and receiving IC 71 applies a voltage, which is the first signal D1-D3, to the first signal line 32 to form a capacitance between the touch means 25 and the conductive pad 50. The position detection signals S1-S3 are received from the signal line 33. In addition, the on / off control IC 72 has an on / off control signal SW1-SW3 and an auxiliary signal AUX1- to the on / off control signal line 34 and the auxiliary signal line 36 mentioned in the embodiments described later. AUX3) is applied. Although not shown, a pull-down resistor connected to ground may be added to the end of the second signal line 33 inside the signal-receiving IC 71, and the signal-receiving IC 71 may include a pull-down resistor. The second signals S1-S3 are obtained at points not connected to the ground. The touch position detector 70 uses a voltage or current output to the second signal line 33 to detect the touch position.

In one embodiment, when the voltage is the detection means, the touch position detection unit 70 turns on the second TFT 42 by applying a high signal to the second on / off control signal line 34b and the second signal line 33. When the voltage is output through the signal, it is detected to determine whether the touch is high or low of the detected voltage. For example, when 5V is applied to the first signals D1-D3 and a touch is generated to form a capacitance between the touch means 25 and the conductive pad 50, the second signal line (eg, through the second TFT 42) is applied. The voltage output to 33) is similar to that of 5V, and when no touch is formed, no voltage is detected or the ground voltage is detected by the pull-down resistor. The touch position detector 70 determines that a touch has occurred when the voltages S1-S3 detected through the second signal line 33 are higher than a reference voltage of a predetermined level, and is lower than the reference voltage. ), It is determined that no touch occurs.

In another embodiment for detecting the touch position, the touch position detector 70 may use a current output to the second TFT 42 and the second signal line 33. When the touch occurs and the capacitance is formed between the conductive pad 50 and the touch means 25, it means that the charge accumulated in the virtual capacitor formed between the conductive pad 50 and the touch means 25, the touch When the second TFT 42 is turned on and the current flows through the second signal line 33, the position detector 70 may detect the touch position by sensing the current.

As an example, the timing controller 73 generates a time division signal of several tens of ms or less, and the signal processor 74 generates a waveform as shown in FIG. 8 according to a clock provided by the timing controller 73. To the on / off control IC 72 side.

8 is a waveform diagram illustrating an example of obtaining a touch signal in the embodiment of FIG. 5. Referring to this, the touch position detector 70 sequentially provides scan pulses to the first on / off control signal line 34a and the second on / off control signal line 34b. First on / off control signal SWm-1 (m = 1, 2, 3) and second on / off control signal SWm-2 (m = 1, 2) provided by the touch position detector 70 3 has a voltage level large enough to allow the gates of the first TFT 41b and the second TFT 42 to enter the active region in the high region. For example, the first on / off control signal SWm-1 is greater than the threshold voltage of the first TFT 41b of the same type as compared to the first signals D1-D3 applied through the first signal line 32. It is good to be set. In a preferred embodiment, the high voltage level of the first signals D1-D3 is 5V, the low voltage level is zero V, the first on / off control signal SWm-1 and the second on / off control. The high voltage level of the signal SWm-2 is 15V, and the low voltage level is set to -5 to -7V to stably turn off the same first TFT 41b and the second TFT 42.

Between each input signal there may be a pause for stabilization of the signal.

The second TFT 42 connected to an arbitrary second on / off control signal line 34b is energized, recognizes the position detection signals of the touch cells 60 including the energized second TFT 42, Before transmitting the first signals D1-D3 to each touch cell 60 connected to the first on / off control signal line 34a, the touch position detector 70 applies a reset signal to detect the position. The completed touch cell 60 is reset. This is a waveform of a section designated as "Reset" in FIG. 8, and is the same type of first TFT 41b since the first on / off control signal SW1-1 and the second on / off control signal SW1-2 are at a high level. ) And the second TFT 42 are in an on state, and the applied low level first signal D1 sets the potential of the conductive pad 50 and the second signal line 33 included in the touch cell 60 in which the detection is completed to a low state. Make it. In the next position detection process of the touch cell 60 in which the touch is detected and the position is completed, the charge is applied to the parasitic capacitor connected to the second signal line 33 due to the previous touch signal even though the touch is not generated. It is a means for preventing the touch position from being misdetected due to the accumulation and the resulting voltage being detected.

A waveform obtained through the second signal line 33 and a process of obtaining a touch signal through the same will be described below. This embodiment is a case of detecting a voltage in a digital manner, and as described above, a current can be used as the detection means.

If the touch is not generated when the on / off control signals SW1-1, SW1-2 and SW2-1, SW2-2 are sequentially applied and the first signals D1 and D2 are sequentially applied, the second signal line 33 The signals S1, S2, S3, obtained through N, have the waveform shown. In the signal sections of the first on / off control signal SW3-1 and the second on / off control signal SW3-2, assuming that touch has occurred in the touch cell 60 at the lower right of FIG. When the high voltage of the control signal SW3-1 is applied, the same first TFT 41b is conducted and the first signal D1 is applied to the conductive pad 50. In addition, a capacitance is formed between the conductive pad 50 and the touch means 25 so that the conductive pad 50 has a voltage similar to that of D1. Since the second on / off control signal SW3-2 is still at a low level and the second TFT 42 is in an off state, the position detection signals S1-S3 may not be output to the second signal line 33 as well as the touch position detection unit 70. Does not determine the position detection signals S1-S3. Thereafter, the first on / off control signal SW3-1 goes low and the same first TFT 41b goes off. Subsequently, when the second on / off control signal SW3-2 is switched to the high level, this turns the second TFT 42 on and the touch position detection signal charged between the conductive pad 50 and the touch means is the second signal line. It is output through 33. And, as shown in the waveform of S3 exhibits an inherent output characteristic and the touch position detector 70 detects this to recognize the touch position.

 In this example, since the position detection signal S3 is obtained by the first signal D3, this means that a touch is made at the coordinates "D3 and S3".

The embodiment of FIG. 8 is an embodiment for acquiring a touch, and it is also possible to acquire a popping point in another method. For example, a high level voltage is applied to all of the first on / off control signals SWm-1, and all the same type first TFTs 41b are turned on at the same time, so that a touch is formed between the touch means and the conductive pad 50 when a touch occurs. Induce charge on the virtual capacitor. Subsequently, all of the homogeneous first TFTs 41b are turned off, and a signal is sequentially applied to the second TFTs 42 to observe the waveform output through the second signal line 33.

It will be apparent to those skilled in the art that various methods of acquiring a touch signal may be used according to the technical idea of the present invention.

On the other hand, in the process of processing a large number of signals, when the CPU 80 is in the "Busy" state, a case where the position detection signal may not be recognized. Since a touch signal that is not already recognized cannot be reproduced, this may result in the loss of the signal, leading to a decrease in reliability of the touch panel.

In order to prevent this, the touch position detector 70 includes a memory means 75 having a bit or more than the number of touch cells 60. Preferably, the memory means 75 has an absolute address corresponding to the coordinate value of the touch cell 60, as shown in FIG. In this embodiment, the memory means 75 has a capacity of at least 9 bits, and the position detection signal received by the touch position detection unit 70 is stored at the address "m9" as coordinate values "D3, S3". The signals thus stored may be called and used by the signal processor 74. If the resolution of the touch cell 60 is 1366x768, the memory means 74 needs a capacity of at least 1049088 bits or more, and secures a capacity of about 132k bytes.

In the present invention, the biggest advantage of installing a three-terminal switching element TFT in each touch cell 60, the position detection signals output from each touch cell 60 to the second signal line 33, the second TFT 42 By partitioning spatially and temporally using), multi-touch recognition is possible. That is, the second TFT of which only one line of the second on / off control signal SWm-2 being scanned has a high level and is turned on by the high level voltage of the second on / off control signal SWm-2. Since only the touch cells 60 including 42 are in an on state, the position detection signal with respect to the touch cell 60 in an on state may be detected through the second signal lines 33 in the longitudinal direction. Accordingly, multi-touch recognition is possible by the spatially separated touch cells 60 and the time-division-scanned second on / off control signal SWm-2.

In the display device of the present invention, the touch cells 60 installed on the upper substrate 30 may be arranged in a matrix form similarly to the pixel portion 22 provided on the lower substrate 20. According to the matrix arrangement structure, the touch cell 60 may be designed with a rule similar to that of the unit pixel of the pixel unit 22, which brings many technical advantages.

In a preferred embodiment, the touch cell 60 is disposed at a resolution having a real magnification compared to the unit pixels installed on the lower substrate 20. As such, when the resolution of the touch cell 60 is arranged to have the resolution and the real magnification of the unit pixel, the signal lines of the lower substrate 20 and the signal lines of the upper substrate 30 are regularly arranged so that the upper and lower signal lines are optical interference. Moiré phenomenon that causes can be avoided. Therefore, even if the signal lines for detecting touch input are arranged on the upper substrate 30, the display quality of the display device does not deteriorate.

In addition, signal lines for detecting a touch input disposed on the upper substrate 30 and signal lines for displaying a screen disposed on the lower substrate 20 (eg, gate lines and data lines disposed on the lower substrate 20). It can be placed on the same vertical line as. This arrangement of the signal lines prevents a decrease in the transmittance of the panel to improve the display quality of the display device and to prevent moiré phenomenon in which a wave pattern appears due to interference between signals for screen display and signals for detecting touch input. To be.

10 shows another embodiment for preventing the moiré phenomenon. Referring to FIG. 10, the wires added by dotted lines are signal lines for screen display disposed on the upper surface of the lower substrate 20, and are usually wired in the horizontal direction and the vertical direction that cross each other. This is merely an example of a gate line and a deterter line on the upper surface of the lower substrate 20 to explain the present embodiment, and in fact, a plurality of signal lines such as a common electrode line are disposed on the upper surface of the lower substrate 20 in the longitudinal direction and the transverse direction. Exists as.

Referring to FIG. 10, the signal lines 32, 33, and 34 disposed on the upper substrate 30, that is, the signal lines for detecting the touch input may have a predetermined angle with respect to the signal line for displaying the screen of the lower substrate 20. It is arranged in the diagonal direction. According to the wiring of the signal lines, the signal line for screen display and the signal line for touch input detection are arranged to be displaced from each other, so that the optical interference between the signal lines can be greatly reduced. Moiré phenomenon can be prevented from occurring. 10 may be replaced by arranging signal lines for displaying the screen of the lower substrate 20 in a zigzag diagonal direction and arranging signal lines for detecting a touch input of the upper substrate 30 in a linear direction. will be.

11 is a configuration diagram illustrating an embodiment in which the actual capacitor 55 is added to the touch cell 60. In the present embodiment, after the charged real capacitor 55 is added, the touch pad 25 is in close proximity to the touch cell 60 and the conductive pad 50 and the capacitance are formed. The capacitor of the charge sharing (Charge Sharing) to lower the potential of the actual capacitor 55, by detecting its size to confirm the touch position. Alternatively, if the touch means 25 is first adjacent to the conductive pad 50 at the time when the first signals D1-D3 are not applied, and then the first signals D1-D3 are applied thereafter, the actual capacitor Since the virtual capacitor due to the touch means 25 is added to the 55, the first signal D1 is applied to the conductive pad 50 where the touch occurs compared to the conductive pad 50 of the touch cell 60 where the touch does not occur. -D3) makes the charging time longer to form, and detects this and confirms the touch position. Alternatively, the conductive pad of the touch cell 60 in which the touch is generated may be compared with the voltage charged in the capacitor 55 connected to the conductive pad 50 of the touch cell 60 in which the touch is not generated within a limited time. The voltage charged in the capacitor 55 connected to 50 is formed to be low, and the touch position is detected by detecting this. The touch position detector 70 detects the difference in the charging time or the magnitude difference of the charged voltage in this way to obtain the touch position.

12 is another embodiment of FIG. 11, in FIG. 11, one side of the capacitor 55 is connected to the second on / off control signal line 34b, but in FIG. 12, an auxiliary signal line in which one side of the capacitor 55 is additionally provided. It is connected to 36. This embodiment allows the potential of the source terminal 43 and the gate terminal 45 connected to the conductive pad 50 to be individually set in the second TFT 42, thereby making the operation of the second TFT 42 smoother. . The auxiliary signal line 36 may be provided by the touch position detector 70 as shown in FIG. 12 or may be provided outside the touch position detector 70. The potentials AUX1-AUX3 of the auxiliary signal line 36 can be set individually, respectively, and all are zero (zero) V in the preferred embodiment.

11 and 12 variously select the capacitance of the capacitor 55 to adjust the magnitude of the voltage after the charge sharing with the virtual capacitor formed between the conductive pad 50 and the body. Alternatively, the presence or absence of a touch can be determined by adjusting the charging time. That is, by adding the capacitor 55, the range of voltage level selection of the touch detection position signal becomes wider, and the touch signal can be stably obtained through various implementations such as the charge sharing method.

11 and 12, various methods for detecting the touch position by determining the high or low of the voltage formed in the capacitor 55 may be provided. In one embodiment, the display device manufacturer measures the voltage range of the capacitor 55 when no touch occurs and the voltage range of the capacitor 55 when the touch occurs through the second signal line 33 and touches it. Input to the position detection unit 70, the touch position detection unit 70 is to use the two input measured values as reference data when determining whether the touch. To this end, the touch position detector 70 includes a comparator (not shown), and determines the magnitude of the voltage received through the second signal line 33 by using the voltage input by the display device manufacturer as a reference voltage of the comparator. You can check the presence or absence. In addition, the touch position detector 70 may include a timer (not shown), and determine whether there is a touch by determining a difference in charging time by the timer.

In another embodiment, as illustrated in FIGS. 11 and 12, the sensing touch cell 61 may be installed on the upper substrate 30, and the reference signal may be measured using the sensing touch cell 61. The sensing touch cell 61 may be installed in various forms. For example, the sensing touch cell 61 may include one or a plurality of TFTs to measure the magnitude of the current. Preferably, the sensing touch cell 61 has the same circuit configuration as the touch cell 60 as shown, but has a form in which the conductive pad 50 is removed. Since the sensing touch cell 61 does not include the conductive pad 50, it does not form a capacitance between the finger and the finger. That is, the signal Sr output from the sensing touch cell 61 is similar to the signals S1-S3 output from the touch cell 60 in which no touch occurs.

At this time, the touch position detector 70 sets the signal Sr measured from the sensing touch cell 61 as a reference voltage of the comparator, and among the position detection signals S1-S3 detected by the second signal line 34. It may be determined that a touch has occurred for a signal lower than the voltage. According to this method, since the display device manufacturer can exclude the process of separately measuring and inputting the reference voltage of the comparator, the production efficiency will be improved.

Meanwhile, since the lengths of the first signal line 32 and the second signal line 33 are different for each position of the touch cell 60 positioned on the upper substrate 30, when the display device is enlarged, the signal lines 32 and 33 The difference in wiring resistance with the length becomes insignificant. This changes the charging / discharging time constant of the voltage charged or discharged in the capacitor 55 connected to the touch cell 60, causing a difference in measurement voltage or a difference in measurement time, which makes it difficult to accurately measure the touch signal. .

FIG. 13 is a block diagram illustrating an embodiment of solving a measurement problem caused by a difference in wiring resistance. Referring to FIG. 13, a plurality of active regions 30a in which a touch input is made on the upper substrate 30 are divided into a plurality of sections. The sensing touch cell 61 is provided for each area. The voltage measured by the capacitor 55 connected to the sensing touch cell 61 becomes the reference voltage of the comparator for measuring the position detection signal in the region where the sensing touch cell 61 is installed.

That is, in the region A of FIG. 13, the voltage Sr1 detected by the capacitor 55 of the sensing touch cell 61, which is 61a, becomes the reference voltage of the comparator for detecting the touch input generated in the region A, and in the region B, 61b. The voltage Sr2 detected by the capacitor 55 of the sensing touch cell 61 becomes a reference voltage of the comparator for detecting the touch input generated in the region B. Accordingly, in order to determine whether the touch cell 60 is touched in the partitioned region, the voltage measured by the sensing touch cell 61 having the length of similar signal lines 32 and 33 in the same partitioned region becomes a reference. The measurement error due to the wiring resistance of the signal lines 32 and 33 can be minimized.

In FIG. 13, the sensing touch cell 61 is illustrated in the active region 30a of the upper substrate 30. However, the sensing touch cell 61 may be installed in the non-operation area 30b in which the touch input is not made on the upper substrate 30. In this case, the sensing touch cell 61 may be installed despite the installation of the sensing touch cell 61. The transmittance of 30) does not decrease. In addition, although the method using the voltage measured by the sensing touch cell 61 is illustrated as a reference voltage, the current may be measured from the sensing touch cell 61 and used as a reference signal.

Although the above-described embodiment has mentioned the finger of the body as the touch means 25 by way of example, the touch means 25 may be replaced with other means such as an iron writing instrument, an electronic pen for generating an electrical signal. For example, when an electronic pen generating a voltage of −Vs is used as the touch means 25, a capacitance may be formed between the electronic pen and the conductive pad 50 so that a voltage of Vs may be formed in the conductive pad 50. have. Since the voltage is applied from the outside, it is not necessary to apply the detection voltage through the first TFT 41 and the first signal line 32. The voltage Vs formed on the conductive pad 50 sequentially energizes the second TFT 42 to detect the touch position in the same manner as described above. In the case of selecting such an embodiment, the circuit configuration of the touch cell 60 may be further simplified.

As such, the present invention is not limited to the above-described embodiment and may be implemented in various embodiments. That is, the present invention is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is an exploded perspective view showing the external structure of a display device according to the present invention;

2 is a cross-sectional view conceptually illustrating an example of an AMOLED.

3 is a conceptual diagram illustrating an example of capacitance formation between conductive pads of a body

4 is a configuration diagram showing an embodiment of an upper substrate

5 is a configuration diagram showing another embodiment of the upper substrate

6 is a plan view illustrating a configuration example of a unit touch cell in the embodiment of FIG. 5;

7 is a block diagram illustrating a system configuration of the present invention.

8 is a waveform diagram illustrating an example of obtaining a touch signal in the embodiment of FIG. 5;

9 is a block diagram conceptually showing one embodiment of a memory means;

10 is a configuration diagram showing an example of wiring of signal lines for removing moiré phenomenon

11 is a configuration diagram showing another embodiment of the upper substrate

12 is a configuration diagram illustrating another embodiment of FIG.

FIG. 13 is a configuration diagram conceptually illustrating an embodiment of solving a measurement error due to a difference in wiring resistance

<Explanation of symbols for the main parts of the drawings>

20: lower substrate 22: pixel portion

24: sealant 25: touch means

26: gate IC 28: source IC

30: upper substrate 30a: active area

30b: non-operation area 32: first signal line

33: second signal line 34: on / off control signal line

34a: first on / off control signal line 34b: second on / off control signal line

36: auxiliary signal line 41: first switching element

41a: first release switching element 41b: first switching element

42: second switching element 43: source terminal (or input terminal)

44: drain terminal (or output terminal) 45: gate terminal

46: contact hole 50: conductive pad

55 capacitor 60 touch cell

61: sensing touch cell 70: touch position detector

71: signal receiving IC 72: on / off control IC

73: timing controller 74: signal processor

75: memory means 76: power stage

80: CPU

Claims (20)

  1. A display device comprising a lower substrate 20 on which a pixel portion 22 composed of pixels and pixel electrodes is disposed, and an upper substrate 30 spaced apart from the lower substrate 20.
    A plurality of first signal lines 32 and second signal lines 33 disposed on an upper surface or a lower surface of the upper substrate 30 for transmitting and receiving a position detection signal, and an on / off control signal line for applying an on / off control signal; (34);
    It is formed in a region where a plurality of active regions where a touch is made on the upper or lower surface of the upper substrate 30 is divided between the first signal line 32 and the second signal line 33 in each divided region. A three-terminal first switching element 41 and a second switching element 42 having a gate terminal connected to the on / off control signal line 34, and the first switching element 41 and the second switching element 42. A touch cell 60 having a conductive pad 50 connected to a connection point of the touch cell 60;
    A plurality of sensing touch cells 61 formed on an upper surface or a lower surface of the upper substrate 30 to generate a position detection signal output to the second signal line 33 and a reference signal for comparison measurement; And
    An on / off control signal is applied to the on / off control signal line 34 to control on / off of the first switching element 41 and the second switching element 42, and the first signal line 32 and the first The position detection signal is transmitted and received through the two signal lines 33, and is formed between the touch means 25 and the conductive pad 50 when the touch means 25 is contacted or approached from the outside of the upper substrate 30. The touch input means characterized in that it comprises a; touch position detection unit 70 for detecting the contact or approach of the touch means 25 by the capacitance, to obtain the coordinate signal of the touch cell 60 in which the touch input occurred Built-in display.
  2. The method of claim 1,
    The display device is a display device with a built-in touch input means, characterized in that any one of LCD, PDP, OLED, AMOLED.
  3. The method of claim 1,
    The lower substrate 20 includes a TFT substrate in which TFTs are disposed for each unit pixel, and a TFT substrate having gate lines and data lines for applying on / off control signals and data signals to the TFTs. Display.
  4. The method of claim 1,
    And the first switching element (41) and the second switching element (42) are TFTs.
  5. The method of claim 1,
    The first switching element 41 is a release first switching element 41a in which on and off operations are performed in reverse with the second switching element 42 by the same on / off control signal. 41a), an input terminal and an output terminal are connected between the first signal line 32 and the conductive pad 50, a gate terminal is connected to the on / off control signal line 34, and the second switching element 42 is input. A terminal and an output terminal are connected between the conductive pad 50 and the second signal line 33, a gate terminal is connected to the on / off control signal line 34, and the touch position detector 70 is connected to the on / off control signal line. (34) A display device with a built-in touch input means, characterized by sequentially applying a scan pulse to each.
  6. The method of claim 1,
    The first switching element 41 is the same first switching element 41b in which on and off operations are performed in the same manner as the second switching element 42 by the same on / off control signal, and the on / off control signal line 34, a first on / off control signal line 34a and a second on / off control signal line 34b are provided separately, and the same type of first switching element 41b has an input terminal and an output terminal having a first signal line ( 32 is connected between the conductive pad 50 and a gate terminal connected to the first on / off control signal line 34a, and the second switching element 42 has an input terminal and an output terminal connected to the conductive pad 50. It is connected between the second signal line 33 and the gate terminal is connected to the second on / off control signal line 34b, the touch position detection unit 70 is the first on / off control signal line 34a and the second Built-in touch input means characterized by sequentially applying scan pulses to each of the on / off control signal lines 34b. Display.
  7. The method of claim 6,
    And a capacitor (55) connected between the conductive pad (50) and the second on / off control signal line (34b).
  8. The method of claim 6,
    A plurality of auxiliary signal lines 36 are further disposed on one surface of the upper substrate 30, and the touch input means may be connected between the conductive pad 50 and the auxiliary signal lines 36. Built-in display.
  9. delete
  10. The method of claim 1,
    The sensing touch cell 61 is a display device with a built-in touch input means, characterized in that formed in the same manner as the touch cell 60 with the conductive pad (50) removed.
  11. The method of claim 1,
    The sensing touch cell 61 is provided for each region in which the upper substrate 30 is divided into a plurality of regions, and the reference signal measured from the sensing touch cell 61 in each region is used for comparing the position detection signal of the region. Display device with a built-in touch input means, characterized in that used as a reference signal.
  12. The method according to any one of claims 1 to 8,
    And a light blocking layer for blocking light is formed on the first switching element (41) and the second switching element (42).
  13. The method according to any one of claims 1 to 8,
    Display device with a built-in touch input means, characterized in that the upper surface or the lower surface of the upper substrate 30 is coated with a transparent insulating film for protecting the touch cell (60).
  14. The method according to any one of claims 1 to 8,
    The touch position detecting unit (70) is a display device with a built-in touch input means, characterized in that for detecting the position detection signal received by the second signal line (33) in a digital manner.
  15. The method according to any one of claims 1 to 8,
    The touch position detecting unit 70 blocks the application of the on / off control signal or the position detection signal to the touch cell 60 where the touch position detection is completed, and resets the corresponding touch cell 60. Built-in display.
  16. The method according to any one of claims 1 to 8,
    Touch input, characterized in that to electrically divide the connection of the second switching elements 42 between the touch cells 60 or time-division a signal applied to the second switching element 42, to recognize the multi-touch input Display with built-in means.
  17. The method according to any one of claims 1 to 8,
    The touch position detector 70 further includes a memory means 75 having addresses corresponding to the coordinate values of the touch cell 60. When the touch position detector 70 receives the position detection signal from the second signal line 33, the corresponding touch cell ( 60. A display device with a built-in touch input means, characterized in that for storing the coordinate value of 60 in a corresponding address of the memory means (75).
  18. The method according to any one of claims 1 to 8,
    Unit pixels are arranged on the lower substrate 20 in a matrix form, and the touch cell 60 of the upper substrate 30 is disposed at a resolution having a real magnification compared to the unit pixels. Built-in display.
  19. The method of claim 18,
    At least one signal line among the signal lines for detecting touch input disposed on the upper substrate 30 is disposed on the same vertical line as at least one signal line among the signal lines for screen display disposed on the lower substrate 20. Display device with a built-in touch input means, characterized in that.
  20. The method according to any one of claims 1 to 8,
    At least one signal line among the signal lines for detecting touch input disposed on the upper substrate 30 is disposed in an oblique direction with respect to at least one signal line among the signal lines for screen display disposed on the lower substrate 20. Display device with a built-in touch input means, characterized in that.
KR1020090063337A 2009-07-13 2009-07-13 Display device having built-in touch input means KR100936369B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070034720A (en) * 2005-09-26 2007-03-29 삼성전자주식회사 A display panel, a display of the touch position detecting apparatus and a display apparatus having the same way
KR20090028626A (en) * 2006-06-09 2009-03-18 애플 인크. Touch screen liquid crystal display

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070034720A (en) * 2005-09-26 2007-03-29 삼성전자주식회사 A display panel, a display of the touch position detecting apparatus and a display apparatus having the same way
KR20090028626A (en) * 2006-06-09 2009-03-18 애플 인크. Touch screen liquid crystal display

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