KR20090017739A - Liquid crystal display with touch sensor embedded and method thereof - Google Patents

Abstract

A touch sensor integrated liquid crystal display and a manufacturing method thereof are provided to improve reliability by including an electrostatic capacity touch sensor with a fast response speed in a transparent electrode with high resistance. A photo sensitizer is coated to form an icon for representing a display image in one side of a second substrate comprising a liquid crystal display panel. The icon is formed by etching the photo sensitizer coating layer and performing a photolithography according to a required icon shape. A transparent electrode comprising a touch sensor(5) is formed by using vacuum deposition method on other side of a second substrate(2) with the icon. A liquid crystal display panel is assembled by assembling a first substrate(1) with the second substrate including the touch sensor composed of the icon and the transparent electrode. A polarizer(6a,6b) is installed outside the first substrate and on the touch sensor of the second substrate.

Description

Liquid crystal display with integrated touch sensor and manufacturing method thereof

The present invention relates to a liquid crystal display device having a touch sensor and a method for manufacturing the same. More particularly, the liquid crystal display device is assembled after forming a touch sensor made of a transparent electrode on a specific part of a substrate constituting the liquid crystal display device. Accordingly, the present invention relates to a touch sensor integrated liquid crystal display device and a method of manufacturing the same, which simplify the manufacturing process of a liquid crystal display device having a touch sensor, thereby making it possible to effectively manufacture a liquid crystal display device with a touch sensor.

In general, a touch sensor used in an electronic device is a state-of-the-art input device that replaces a keyboard and a mouse. The touch sensor is mounted on a monitor, and a user uses a hand or a touch pen to display the touch sensor. By contact, the desired work can be performed.

Such a touch sensor is an ideal device capable of performing intuitive tasks in a GUI (Graphic User Interface) environment.

 Therefore, the touch sensor can be widely used in computer-based training, simulation applications, office automation applications, education applications, and game applications.

Such a touch sensor generates a photo current according to light reflected by a finger or a touch pen, for example, charges the generated charge, and detects a voltage according to the charged charge to contact the object. Detect the position of.

In addition, since the touch sensor is not a mechanical interface, it can be made transparent using ITO, and there is an increasing demand for providing such a transparent sensor, which does not interfere with displaying information on a display on which the transparent sensors are installed. This is because such information can be displayed through the transparent touch sensor.

On the other hand, as a prior art for such a touch sensor, there is an invention as disclosed in Patent Publication No. 10-2007-0032924, the touch sensor according to the present invention provides a touch sensor that can achieve an excellent touch sensor even in a high resistance transparent electrode However, in the touch sensor according to the present invention, since two resistive electrodes constituting the sensor are not set on one substrate but two sensors are provided on each of the substrates spaced apart from each other, the sensing process is not only degraded but also the manufacturing process is performed. It causes an increase.

In addition, the touch sensor according to the present invention has a problem in that the display and the touch sensor are separated, and thus a process of assembling them is further required.

In addition, a liquid crystal display in which a touch sensor is integrally provided is disclosed as Unexamined Patent Publication No. 10-2006-0085878. The touch sensor according to the present invention uses two substrates to fabricate a resistive touch sensor or a capacitive touch sensor. In order to change the electrical signal by applying pressure to the touch sensor, it is difficult to accurately operate the touch sensor provided on the liquid crystal display screen with a light touch. The manufacturing process is difficult to install in the manufacturing cost was a disadvantage that increases.

Accordingly, the present invention solves the problems related to the conventional touch sensor and the touch screen as described above, providing a capacitive touch sensor integrated liquid crystal display device and a manufacturing method thereof, the manufacturing process of the touch sensor integrated liquid crystal display device and It is an object of the present invention to provide an integrated liquid crystal display device having a capacitive touch sensor for high resistance capable of reducing manufacturing costs and operating sensitively with only a light touch, and a method of manufacturing the same.

In order to achieve the above object, a method of manufacturing a touch sensor integrated liquid crystal display device according to the present invention coats a photosensitive agent to form an icon for displaying a display image on one side of a second substrate constituting the liquid crystal display panel. A photoresist coating step, an icon forming step of forming an icon by etching and photolithography according to a desired icon shape on the photosensitive agent coating layer, and using a vacuum deposition method on an opposite side of the second substrate on which the icon is formed A transparent electrode forming step of forming a transparent electrode constituting a touch sensor, and a liquid crystal display panel assembly step of forming a liquid crystal display panel by assembling a second substrate having a touch sensor made of the icon and the transparent electrode with a first substrate; Polarizer for installing the polarizer on the touch sensor of the second board and on the outside of the first board. Made with low installation steps.

In the liquid crystal display device with a touch sensor integrated according to the present invention, a liquid crystal display panel for displaying a display of an image or information is formed by overlapping a first substrate and a second substrate, and an edge between the first substrate and the second substrate. Spacers are sealed to form a space in the liquid crystal, liquid crystal is injected into the space between the first substrate and the second substrate, and a touch sensor made of a transparent electrode is formed on one side of the second substrate. A polarizer is formed on the outer side of the first and second substrates; The touch sensor includes the radiation electrode and the sensing electrode, the radiation electrode and the sensing electrode are arranged in a short state on the same plane of the second substrate, and the radiation electrode and the sensing electrode are alternately arranged. While the sensing sensitivity can be increased, the polarizer covered on the touch sensor of the second substrate has a structure coated with a transparent inorganic material.

The integrated liquid crystal display device including the touch sensor of the present invention can not only reduce the manufacturing process but also match the touch sensor with the liquid crystal display device to embed various switches and control devices in the liquid crystal display device. It is possible to significantly reduce manufacturing costs by not attaching another touch sensor and touch screen, and to provide a touch sensor having excellent capacitive circuit performance while using a high resistance transparent electric conductor.

In addition, the transparent electrode obtains position information by a change in capacitive coupling of a sensing electrode in which a voltage continuously radiated from the radiation electrode in a capacitive manner receives an input signal by a touch of a finger and a touch pen. The transparent electrode is formed on the second substrate through vacuum deposition and is integrally formed in the liquid crystal display device.

As described above, the touch sensor integrated liquid crystal display according to the present invention can reduce the manufacturing process and manufacturing cost by forming a touch sensor on the electrode using a vacuum deposition method, and the electrode of the touch sensor is horizontally placed on a single substrate in two dimensions. By forming the array in a state, it is possible to obtain an effect of improving the reliability and satisfaction by providing a capacitive touch sensor with a fast response speed even in a high resistance transparent electrode.

In addition, such a touch sensor integrated liquid crystal display device can minimize the buttons of automobiles and various electronic devices, thereby securing the installation space of the apparatus and manufacturing the integrated buttons.

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

1 is a schematic view of a touch sensor integrated liquid crystal display device according to the present invention, FIG. 2 is a cross-sectional view taken along line II of FIG. 1, FIG. 3 is a schematic diagram of vacuum deposition of a transparent electrode, and FIGS. 4 and 5 illustrate a method of manufacturing a liquid crystal display device. FIG. 6 is a schematic diagram of a transparent electrode pattern, and FIG. 7 schematically illustrates a cross-sectional view of a sensor region.

1 is a schematic diagram of an embodiment of a touch sensor integrated liquid crystal display device according to an embodiment of the present invention, in which a liquid crystal display panel 100 displaying a display of an image, information, or the like is provided with a first substrate 1 and a second substrate 2. Is overlapped with each other, and a spacer 3 is sealed to form a space at an edge between the first substrate 1 and the second substrate 2, and the first substrate 1 and the second substrate are sealed. While the liquid crystal 4 is injected into the space between the two, the touch sensor 5 made of a transparent electrode is formed on one side of the second substrate 2, and the touch sensor 5 is formed. The polarizers 6a and 6b are covered on the outer side of the second substrate 2 and the first substrate 1.

The manufacturing process for the liquid crystal display panel composed of the first substrate 1 and the second substrate 2 is a known configuration. In the present invention, since a known general liquid crystal display panel manufacturing method is used as it is, a detailed description thereof will be given. It will be omitted.

However, a backlight unit (not shown) for generating light by a power source is installed below the first substrate 1.

In addition, the touch sensor 5 should be made of a transparent electrode so that the icons displayed in the liquid crystal display panel can be seen. The transparent electrode should be made transparent using an oxide-based material such as ITO and IZO.

On the other hand, the polarizer 6a installed on the touch sensor 5 of the second substrate 2 is formed by coating silica and an oxide protective film on PET, so as not to leave traces of fingerprints by hands, as well as various dusts. It prevents foreign matter from attaching and protects the touch sensor 5.

In addition, since the polarizer 6a needs to be able to sense capacitance by a touch of a hand or a touch pen, the polarizer 6a preferably has a thickness within 1 mm so as to change an AC electric field by touch.

Meanwhile, if necessary, after the liquid crystal display panel 100 is manufactured without using the polarizer 6a as described above, silica and oxides having high transmittance are formed by vacuum deposition in the same manner as the touch sensor 5. By depositing the above, manufacturing cost and process of the touch sensor integrated liquid crystal display device can be reduced.

3 is a schematic view showing a method of manufacturing a touch sensor type liquid crystal display device according to the method of the present invention. The process of manufacturing the touch sensor type liquid crystal display device according to the present invention comprises the steps of constructing the liquid crystal display panel 100. A photoresist coating step of coating a photoresist to form an icon for displaying a display image on one side of the substrate 2 first, and etching the photoresist according to a desired icon shape on the photoresist coating layer and performing photolithography treatment. Icon forming step of forming a transparent electrode forming step of forming a transparent electrode forming the touch sensor (5) by using a vacuum deposition method on the opposite side of the second substrate (2) on which the icon is formed, the icon and the transparent electrode A liquid crystal display panel assembly step of assembling the second substrate 2 having the touch sensor 5 with the first substrate 1 to form the liquid crystal display panel 100; and It consists of a polarizer installation step of installing the polarizers 6a and 6b on the touch sensor 5 of the first substrate 1 and on the outer side of the first substrate 1.

In the forming of the transparent electrode in the transparent electrode forming step, the touch sensor 5 may be deposited by using the shadow mask 8 having the transparent electrode pattern 7 formed thereon.

As described above, the touch sensor 5 may be formed by sputtering vacuum deposition of oxide-based materials such as ITO and IZO.

In addition, icons formed on the liquid crystal display panel 100 are formed on both inner surfaces of the first substrate 1 and the second substrate 2, respectively, and the liquid crystals 4 filled between the substrates 1 and 2. As shown through, the formation process and the method of the icon is also a known general technique.

FIG. 4 overlaps the second substrate 2 on which the electrode of the touch sensor 5 is formed and the first substrate 1 on which an icon pattern is formed, wherein the first substrate 1 and the second substrate ( 2) a spacer 3 is inserted between the spacers 3 to maintain a predetermined interval, and the liquid crystal 4 is injected into the space between the first substrate 1 and the second substrate 2, and the liquid crystal injection hole is opened. When the sealing process is performed, a touch sensor integrated liquid crystal display device may be formed as shown in FIG. 4.

FIG. 5 is a fingerprint and various dust or foreign substances by hand by attaching a polarizer 6 coated with silica and an oxide protective film to PET on the touch sensor 5 of the touch sensor integrated liquid crystal display as shown in FIG. 4. It also serves to protect the transparent electrode.

In this case, the polarizer 6a is preferably coated with an oxide having high permeability and silica with a coating film in order not to affect the permeability.

In addition, after the liquid crystal display panel 100 is manufactured without using the polarizers 6a and 6b, the touch sensor is integrated by depositing silica and oxide having high transmittance by vacuum deposition in the same manner as the touch sensor 5. The manufacturing cost and process of the liquid crystal display device can be reduced.

6 is a pattern configuration diagram of the touch sensor 5 according to the present invention. The touch sensor 5 includes a radiation electrode 5a and a sensing electrode 5b, and the radiation electrode 5a and the sensing electrode ( 5b) is disposed in a shorted state, and the radiation electrode 5a and the sensing electrode 5b are alternately arranged with each other in order to obtain maximum sensing sensitivity.

FIG. 7 is a cross-sectional view of the sensor region of the touch sensor 5 according to the present invention, in which electric field lines connecting the radiation electrode 5a and the sensing electrode 5b are schematically illustrated. In the figure, only a part of the radiation electrode 5a and the sensing electrode 5b constituting the second substrate 2 and the touch sensor 5 are shown for simplicity.

FIG. 7A shows the electric field when no object is adjacent to the sensor, and FIG. 7B shows the electric field when there is an object (a user's finger) adjacent to the sensor.

As shown in FIG. 7A, in the case where no object in the touch sensor 5 is adjacent to the sensor, electric field lines radiated from all the radiation electrodes 5a are connected between the sensing electrodes 5b. However, as shown in FIG. 7B, when the user's finger is adjacent to the sensor, a part of the electric force line passing between the two electrodes is coupled to the ground plane through the finger.

Thus, few electric field lines are connected between the electrodes and capacitive coupling between the electrodes is reduced.

As described above, the touch sensor 5 according to the present invention can detect a change between the electrodes by monitoring the amount of charge between the radiation electrode 5a and the sensing electrode 5b, and by using the result, the touch sensor 5 To determine if a particular object is adjacent to

On the other hand, the sensitivity of the position sensor of the touch sensor 5 according to the present invention depends on the extent to which the electric field spreads in all directions from the region between the radiation electrode 5a and the sensing electrode 5b.

For this reason, if the intensity of the electric field is increased, the sensitivity is increased. However, since the touch sensor 5 made of the transparent electrode, as in the present invention, is too large in resistance, the reliability and response characteristics of the sensor may be lowered. Therefore, it is important to find a balance between the pattern size of the touch sensor 5 and the spacing of the patterns.

In order to increase the reliability and response characteristics, it is preferable to set the pattern line so that the resistance of the radiation electrode 5a and the sensing electrode 5b longest at the touch sensor position is 5 kΩ or less.

In addition, although the radiation electrode 5a and the sensing electrode 5b are preferably interchanged with each other at the icon position displayed on the first substrate 1, if they are alternated with each other except at the icon position, the detected object approaches. It can be detected and operated in an undesired position by.

In order to prevent such a problem from occurring, it is preferable that the radiation electrode 5a and the sensing electrode 5b be designed so as not to be interchanged with each other except where the icon positions are alternate with each other.

1 is a schematic diagram of a touch sensor integrated liquid crystal display device according to the present invention;

2 is a cross-sectional view taken along the line I-I of FIG.

3 is a schematic diagram of vacuum deposition of a transparent electrode;

4 and 5 are process charts for manufacturing a liquid crystal display device;

6 is a transparent electrode pattern configuration diagram,

7 is a cross-sectional view of a sensor region in a touch sensor integrated liquid crystal display according to the present invention;

7A is a cross-sectional view showing a state before touching a hand on a liquid crystal sensor;

7B is a cross-sectional view illustrating a state in which a part of an electric force line passing between two electrodes by touching a hand with a liquid crystal sensor is grounded through a finger.

* Description of Reference Symbols in the Drawings *

1-1st board 2-2nd board

3-spacer 4-liquid crystal

5-Polarizer 7-Pattern

8-shadow mask

Claims (7)

A photoresist coating step of coating a photoresist to form an icon for displaying a display image on one side of the second substrate constituting the liquid crystal display panel, and etching the photoresist according to a desired icon shape on the photoresist coating layer. An icon forming step of forming an icon by performing a graphics process, a transparent electrode forming step of forming a transparent electrode forming a touch sensor using a vacuum deposition method on the opposite side of the second substrate on which the icon is formed, a touch sensor comprising the icon and the transparent electrode Assembling the second substrate with the first substrate to form a liquid crystal display panel, and installing the polarizer to install the polarizer on the touch sensor of the second substrate and the outside of the first substrate. Manufacturing method of touch sensor integrated liquid crystal display The method of claim 1, wherein the forming of the transparent electrode in the transparent electrode forming step comprises depositing and forming a touch sensor using a shadow mask having a pattern of the transparent electrode. A liquid crystal display panel 100 for displaying a display of an image, information, or the like is formed by overlapping a first substrate 1 and a second substrate 2, and between the first substrate 1 and the second substrate 2. In order to form a space at the edge of the spacer 3 is sealed, the liquid crystal 4 is injected into the space between the first substrate 1 and the second substrate 2, the second A touch sensor 5 made of a transparent electrode is formed on one side of the substrate 2, and the polarizer layer 6 is covered on the outer side of the first substrate and the second substrate; The touch sensor 5 is composed of the radiation electrode 5a and the sensing electrode 5b, and the radiation electrode 5a and the sensing electrode 5b are short-circuited on the same plane of the second substrate 2. The radiating electrode 5a and the sensing electrode 5b are alternately arranged in a portion where the icons formed on the first substrate 1 and the second substrate 2 are located, and the icons are formed. Touch sensor-integrated liquid crystal display device in which transparent inorganic material is coated on the polarizer covered on the touch sensor of the second substrate while increasing the sensing sensitivity at the portion where icons are formed without being alternately arranged side by side. The touch sensor integrated liquid crystal display device according to claim 3, wherein the transparent electrode (5) is formed by sputtering vacuum deposition of oxide-based materials such as ITO and IZO. [5] The thickness of claim 3, wherein the polarizer 6 has a thickness of 1 mm or less so that the value of the alternating electric field can be changed by touch in order to sense capacitance by a touch of a hand or a touch pen. Touch sensor integrated liquid crystal display The liquid crystal display of claim 3, wherein the polarizer 6 is formed of a coating film made of silica and an oxide having high transmittance so as not to affect the transmittance. 4. The liquid crystal display device with a touch sensor according to claim 3, wherein the resistance of the longest line among the radiation electrode 5a and the sensing electrode 5b of the touch sensor 5 is formed by a pattern line of 5 kΩ or less.

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