KR20040017138A - Image display device combined touch panel and method for manufacturing thereof - Google Patents

Abstract

PURPOSE: An image display device integrating a touch panel and a method for fabricating the same are provided to form first transparent electrodes of the touch panel on an upper substrate of an LCD for removing unnecessary transparent substrate and use an optical plate formed of a polarization plate and a phase difference plate as the upper substrate of the touch panel instead of using any particular optical film. CONSTITUTION: An image display device integrating a touch panel includes an LC panel(200), and a touch panel(300). The LC panel has a lower substrate(210) formed with a first optical plate(260), and the first optical plate has a λ/4 and λ/2 phase difference plates(280b,280a) and a first polarization plate(270) stacked in sequence under the lower substrate. The touch panel has a first electrode(310) formed on an upper substrate(230) of the LC panel, dot spacers(320) formed on the first transparent electrode, and a touch panel upper substrate(330). The touch panel upper substrate has a second optical plate(340) formed with a second polarization plate(350) and a second phase difference plate(360) under the second polarization plate, and second transparent electrodes(370) integrally formed under the second phase difference plate. The second phase difference plate is formed of λ/2 and λ/4 phase difference plates(360a,360b) stacked in sequence under the second polarization plate.

Description

Touch panel integrated image display device and manufacturing method thereof {IMAGE DISPLAY DEVICE COMBINED TOUCH PANEL AND METHOD FOR MANUFACTURING THEREOF}

The present invention relates to a touch panel integrated image display device and a manufacturing method thereof, and more particularly, to a touch panel integrated image display device and a method of manufacturing the same that can reduce the thickness of the product and reduce the manufacturing cost.

In general, a touch panel means that a person's hand or an object is brought into contact with a character or a specific position displayed on the screen by an image display device without using a keyboard, and the position is determined to be processed by stored software. Says a device that can.

Touch panels, particularly pressure-sensitive resistive touch panels, are formed on two transparent substrates so as to face transparent electrodes having resistive components at regular intervals. When a current is applied to the transparent electrodes, a voltage is applied to each of the transparent electrodes by the resistance component, and when the hands are touched, the two transparent electrodes are in contact with each other. Therefore, due to the resistance component of the two transparent electrodes, it becomes the same as the parallel connection of the resistance, and the change in the resistance value occurs. In this case, when the voltage change occurs due to the current flowing through both transparent electrodes, This is how you know where you are in contact.

The liquid crystal display, which is one of the image display devices, applies an electric field to a liquid crystal material having an anisotropic dielectric constant injected between an array substrate and a color filter substrate, which is a thin film transistor substrate, and the intensity of the electric field. The display device obtains a desired image signal by controlling the amount of light transmitted through the substrate. Hereinafter, an image display device having a touch panel will be described, taking as an example a liquid crystal display device that is one of the image display devices.

In general, a touch panel liquid crystal display includes a liquid crystal display including a liquid crystal display panel that largely displays a predetermined image, a backlight assembly that supplies light to the liquid crystal display panel, and a touch panel that receives an input by a user's touch. Is done.

First, a liquid crystal display panel of a liquid crystal display device includes a lower substrate provided with a thin film transistor, an upper substrate provided with a color filter on a surface facing the lower substrate and facing the thin film transistor, and a liquid crystal encapsulated therebetween. Is done.

In addition, the liquid crystal display includes a first polarizing plate for converting light incident from the backlight assembly into the liquid crystal display panel into linearly polarized light on the opposite side of the surface on which the thin film transistor of the lower substrate is formed, and the corresponding second polarizing plate is formed on the upper substrate. It is provided on the side opposite to the surface in which the color filter is formed.

A phase difference plate having the same phase delay is provided between the first polarizing plate and the lower substrate and between the second polarizing plate and the upper substrate, respectively. The retardation plate generally serves to emit linearly polarized light by incidence of linearly polarized light by using a λ / 4 retardation plate or to emit linearly polarized light by incidence of circularly polarized light.

The touch panel includes a first substrate provided on the second polarizing plate, a second substrate spaced apart from the first substrate by a predetermined distance, and a first surface formed on each of the facing surfaces of the first and second substrates. And a dot spacer formed on the second transparent electrode and the first transparent electrode.

The first substrate of the touch panel is made of a transparent material so that a predetermined image provided from the liquid crystal display device can be transmitted, and the second substrate is made of a special optical material made of a material having an optically isotropic refractive index such as polycarbonate. Use film.

As described above, the touch panel liquid crystal display device includes a transparent substrate serving as a first substrate of the touch panel and a transparent substrate serving as an upper substrate of the liquid crystal display panel with a second polarizing plate as a boundary. Therefore, since the light provided from the lower side of the liquid crystal display panel or the light incident from the outside must pass through the upper substrate of the liquid crystal display panel and the first substrate of the touch panel, respectively, a loss of light is caused, respectively. There is a problem that the use of a transparent substrate increases the overall thickness of the product and increases the manufacturing cost.

In addition, the special optical film serving as the second substrate of the touch panel is only used as a support on which a second transparent electrode made of indium tin oxide (ITO) or indium zinc oxide (IZO) is deposited. There is a problem that the price is expensive and also vulnerable in terms of durability.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems in the related art, and an object of the present invention is to provide a touch panel integrated image display device for reducing the thickness of a product and lowering the manufacturing cost.

Another object of the present invention is to provide a method of manufacturing the above touch panel integrated image display device.

1 is a cross-sectional view for describing a touch panel integrated liquid crystal display device according to an exemplary embodiment of the present invention.

FIG. 2A is a diagram illustrating an operating state of a touch panel integrated liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2B is a partially enlarged view of A shown in FIG. 2A.

FIG. 3A is a conceptual diagram of a touch panel integrated liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 3B is a view for explaining a setting angle between the polarizing plate and the phase difference plate shown in FIG. 3A.

4A is a conceptual diagram of an antireflection film, and FIG. 4B is a view for explaining a hard coating film and an antireflection film.

5A to 5E are views for explaining a manufacturing process of the touch panel integrated liquid crystal display according to the exemplary embodiment of the present invention.

6A to 6C are views for explaining the manufacturing process of the dot spacer shown in FIG. 5D.

<Description of Symbols for Main Parts of Drawings>

100: touch panel integrated liquid crystal display device 210: lower substrate

230: upper substrate 250: liquid crystal

270: first polarizing plate 280: first retardation plate

320: dot spacer 340: second polarizing plate

350: second retardation plate

According to one aspect of the present invention, there is provided a touch panel integrated image display device comprising: a first transparent electrode formed on an upper portion of image display means for displaying a predetermined image; A plurality of dot spacers formed on the first transparent electrode; Polarizers spaced apart from each other by a predetermined interval to face the first transparent electrode; A first retardation plate provided on the polarizing plate to face the first transparent electrode; A second retardation plate provided on the first retardation plate; And a second transparent electrode formed on the second retardation plate to detect positional information by contacting the first transparent electrode.

In addition, a method for manufacturing a touch panel integrated image display device according to another aspect for performing the above object of the present invention includes the steps of: (a) forming a first transparent electrode on the image display device; (b) forming a dot spacer on the first transparent electrode; (c) a first step comprising a polarizing plate, a second step of sequentially forming a λ / 2 retardation plate and a λ / 4 retardation plate on the polarizing plate so as to face the first transparent electrode, and Forming an upper substrate for a touch panel by a third step of forming a transparent electrode; And (d) combining the image display device formed by the step (b) and the upper substrate for the touch panel formed by the step (c) so that the first transparent electrode and the second transparent electrode face each other. Is done.

According to such a touch panel integrated image display device and a method of manufacturing the same, by forming the first transparent electrode of the touch panel on the upper substrate of the image display device, the overall thickness of the product can be reduced and the manufacturing cost of the product can be lowered.

Hereinafter, a touch panel integrated image display device and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In particular, a touch panel integrated image display device of the present invention will be described taking an example of a liquid crystal display device which is one of the image display devices.

1 is a cross-sectional view illustrating a touch panel integrated liquid crystal display device according to an exemplary embodiment of the present invention. In particular, FIG. 1 is a cross-sectional view illustrating a touch panel integrated liquid crystal display device in which a liquid crystal display panel and a touch panel are integrally formed.

Referring to FIG. 1, a touch panel integrated liquid crystal display device 100 according to an exemplary embodiment of the present invention may provide a liquid crystal display panel 200 that provides a predetermined image and a backlight assembly that provides light to the liquid crystal display panel 200. And a touch panel 300 integrally provided with the liquid crystal display device described above.

Hereinafter, the liquid crystal display device will be described with reference to the liquid crystal display panel 200.

In detail, the liquid crystal display panel 200 includes a lower substrate 210 on which a thin film transistor (not shown) is formed, and the lower substrate 210 and a plurality of color filters on one surface of the liquid crystal display panel facing the lower substrate 210. The upper substrate 230, the liquid crystal 250 enclosed between the lower substrate 210 and the upper substrate 230, and the first optical plate 260 formed below the lower substrate 210 are provided. Is done.

On the lower substrate 210, a pixel electrode 220 for applying a voltage to drive a liquid crystal 250 to display a predetermined image is applied onto the thin film transistor, and the pixel electrode 220 is disposed on the upper substrate 230. Correspondingly, a common electrode 240 for driving the liquid crystal 250 is applied onto the R, G, and B color filters. The pixel electrode 220 and the common electrode 240 are generally made of indium tin oxide (ITO) or indium zinc oxide (IZO).

The first optical plate 260 formed on the surface opposite the surface on which the pixel electrode 220 is formed of the lower substrate 210 has a lambda / 4 phase difference plate 280b and a lambda / 2 phase difference plate 280a. And a first polarizing plate 280 sequentially stacked from the first polarizing plate 280 and a first polarizing plate 270 formed on the λ / 2 retardation plate 280a.

The touch panel 300 includes a first transparent electrode 310 formed on the upper substrate 230 of the liquid crystal display panel 200, a dot spacer 320 formed on the first transparent electrode 210, and an upper portion of the touch panel. It consists of a substrate 330.

The touch panel upper substrate 330 includes a second optical plate 340 formed of a second polarizing plate 350, a second retardation plate 360 formed under the second polarizing plate 350, and a second retardation plate 360. It includes a second transparent electrode 370 formed integrally on the lower side.

The second phase difference plate 360 is formed by sequentially stacking the? / 2 phase difference plate 360a and the? / 4 phase difference plate 3650b from the lower surface of the second polarizing plate 350.

The touch panel upper substrate 330 including the second transparent electrode 360 is disposed on the upper substrate 230 of the liquid crystal display panel 200 by the adhesive 380 provided along the edge of the second transparent electrode 370. It is adhered to the first transparent electrode 310 formed on. The adhesive 380 not only adheres the first transparent electrode 310 and the second transparent electrode 370, but also maintains a gap between the first transparent electrode 310 and the second transparent electrode 370.

FIG. 2A is a diagram illustrating an operating state of a touch panel integrated liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2B is a partially enlarged view of A shown in FIG. 2A.

2A and 2B, a touch panel integrated liquid crystal display 100 in which a touch panel upper substrate 330 is pressed by a user is illustrated.

In order to determine the position indicated by the user, the touch panel integrated liquid crystal display 100 needs to change a voltage by contacting the first transparent electrode 310 and the second transparent electrode 360 through which current flows, respectively. do. That is, the touch panel upper substrate 330 of the portion where the user's hand touches is bent by the user's touch, and the second transparent electrode 360 and the first transparent electrode 310 are in contact with each other. As a result, the voltage between the first transparent electrode 310 and the second transparent electrode 360 is changed, so that the position touched by the user can be determined by the voltage change.

When the user presses the touch panel upper substrate 330 so that the second transparent electrode 360 and the first transparent electrode 310 are in contact with each other, the dot spacer 320 formed on the first transparent electrode 310 is second transparent. The electrode 360 relieves the impact caused by the contact with the first transparent electrode 310, and when the user releases the touch panel, the touch panel upper substrate 330 provided with the second transparent electrode 360 returns to its original position. It is elastic to provide a repulsive force to return and is formed of a transparent material so that light transmitted through the liquid crystal display panel 200 is not blocked by the dot spacer 320.

Therefore, light transmitted through the upper substrate (not shown) of the liquid crystal display panel 200 is not blocked by the dot spacer 320, and the touch panel upper substrate 330 touched by the user is the dot spacer 320. ), You can immediately return to its original state when the user releases his hand.

The dot spacer 320 may be formed on the first transparent electrode 310 to be in contact with the second transparent electrode 360. However, it is preferable that the height H of the dot spacer 320 protrudes to a height H smaller than the spaced distance between the first transparent electrode 310 and the second transparent electrode 350, particularly 2 to 10 μm. It is preferred to have a height H of.

On the other hand, the dot spacer 320 has an elliptic pillar shape, the elliptical diameter of the lower end in contact with the first transparent electrode 310 preferably has a length of 10 to 80㎛ or less.

3A is a conceptual diagram of a touch panel integrated liquid crystal display according to an embodiment of the present invention. In particular, FIG. 3A is a conceptual diagram of a touch panel integrated reflection-transmissive liquid crystal display according to an embodiment of the present invention. It is a figure for explaining the setting angle of the polarizing plate and phase difference plate which are shown.

First, referring to FIG. 3A, a touch panel integrated reflection-transmissive liquid crystal display device in an off state in which a liquid crystal display panel is normally white mode and power is not applied between both ends of the liquid crystal layer is illustrated. The touch panel integrated reflection-transmission type liquid crystal display device is divided into a reflection area and a transmission area. First, the reflection area of the touch panel integrated reflection-transmission type liquid crystal display device will be described.

The liquid crystal 250 of the touch panel integrated reflection-transmissive liquid crystal display device is a liquid crystal in a normally white mode and exhibits a white color when there is no voltage in the liquid crystal 250, and a voltage is applied to the liquid crystal 250. When applied, it shows a black color.

In the touch panel integrated reflection-transmissive liquid crystal display device, the external light L1 passes through the second polarizer 350 and is changed into linearly polarized light L2 based on a path through which light supplied from the outside passes. . The linearly polarized light L2 passes through the λ / 2 retardation plate 360a again, and the linearly polarized light L2 is emitted in the form of linearly polarized light L3 having a 180 degree phase delay.

At this time, when the light incident on the λ / 2 retardation plate 360a is decomposed into a vertical vibration component and a horizontal vibration component, the vertical vibration component or the horizontal vibration component of the incident light is emitted with a 180 degree phase delay, that is, a half wavelength is delayed. . Therefore, the oscillation axis of incident light which is linearly polarized light is emitted in the form of linear flat light rotated by 90 degrees.

The linearly polarized light L3 passing through the λ / 2 retardation plate 360a passes through the λ / 4 retardation plate 360b, and is changed to the circularly polarized light L4 by a 90 degree phase delay. Circularly polarized light L4 may be right circularly polarized light or left circularly polarized light.

At this time, when the light incident on the λ / 4 retardation plate 360b is decomposed into a vertical vibration component and a horizontal vibration component, the vertical vibration component or the horizontal vibration component of the incident light is emitted with a phase delay of 90 degrees. Therefore, the oscillation axis of the incident light, which is linearly polarized light, rotates in a spiral shape as the incident light progresses, and is emitted in the form of circular light.

Circularly polarized light L4 passes through the liquid crystal 250 again, and since the liquid crystal 250 has no voltage applied to the liquid crystal 250, the molecular axis is twisted by 90 degrees, and the light passing through the liquid crystal 250 is λ. A / 4 phase delay is issued. Therefore, circularly polarized light L4 incident on the liquid crystal is changed back to linearly polarized light L5. The linearly polarized light L5 is reflected by the reflecting electrode 290 to become the linearly polarized light L6, and then incident on the liquid crystal 250 again, whereby a phase delay of λ / 4 is generated by the liquid crystal 250 to the circularly polarized light L7. do.

The circularly polarized light L7 that has passed through the liquid crystal 250 is changed to linearly polarized light L8 by passing through the λ / 4 retardation plate 360b. Thereafter, the linearly polarized light L9 having a 180 degree phase delay through the λ / 2 phase difference plate 360a passes through the second polarizing plate 340 and is emitted. At this time, since the oscillation axis of the linearly polarized light L9 incident on the second polarizing plate 350 forms the same direction as the transmission axis direction formed on the second polarizing plate 350, the oscillation axis passes through the second polarizing plate 350 without being absorbed.

On the other hand, light is incident on the first polarizing plate 270 provided below the lower substrate 210 of the liquid crystal display panel from the backlight assembly, which is not shown in the transmission region.

The light L10 generated from the backlight assembly is incident through the first polarizing plate 270 to become linearly polarized light L11, and then linearly polarized light L12 having a 180 degree phase delay through the λ / 2 phase difference plate 280a. ) Is emitted and passes through the λ / 4 retardation plate 280b to be changed into circularly polarized light L13. In this case, the circularly polarized light L10 may be right circularly polarized light or left circularly polarized light.

The circularly polarized light L13 having passed through the λ / 4 retardation plate 280b is changed into linearly polarized light L14 due to a phase change by λ / 4 by the liquid crystal 250.

The linearly polarized light L14 that has passed through the liquid crystal 250 is changed into circularly polarized light L15 while passing through the λ / 4 retardation plate 360b. Circularly polarized light L15 becomes circularly polarized light L16 through which the phase delay of 180 degree passes through the λ / 2 retardation plate 360a. At this time, while circularly polarized light L16 passes through the second polarizing plate 350, only light having the same component as that of the transmission axis of the second polarizing plate 350 is transmitted.

Referring to FIG. 3B, the first and second polarizing plates 270 and 350 and the first and second retardation plates 280 and 360 illustrated in FIG. 3A may be disposed to improve reflectance and transmittance. It must be provided at an angle.

A transmission axis of the first polarizing plate 270 is defined as an X axis, and an axis perpendicular to the X axis is defined as Y porridge. First, the λ / 2 retardation plate 280a formed on the first polarizing plate 270 has an axis that delays the phase of incident light, that is, the slow axis 1-1 direction of the λ / 2 retardation plate 280a is It is preferable to set so that the angle (theta) 1 which forms with an X-axis has a range of 90 degrees-180 degrees.

Further, the λ / 4 retardation plate 280b provided on the λ / 2 retardation plate 280a has an axis for delaying the phase of incident light, that is, the slow axis 2-2 direction of the λ / 4 retardation plate 280b. It is preferable that the angle θ2 formed with the X axis is provided to have 45 to 135 degrees.

It is preferable that the second polarizing plate 350 and the second retardation plate 350 also have the same set angle as the angle formed by the first polarizing plate 270 and the first retardation plate 280.

The above-described touch panel integrated reflection-transmissive liquid crystal display device receives external light and reflects it, and transmits it by using light generated therein, thereby displaying a predetermined image and integrating it with the touch panel. The present invention can provide a touch panel integrated reflection-transmissive liquid crystal display device which can reduce light loss, reduce product thickness, and reduce manufacturing cost.

In the above-described touch panel integrated reflection-transmission type liquid crystal display device, the reflection area is the same as the touch panel integrated reflection type liquid crystal display device, while the transmissive area is the same as the touch panel integrated reflection type liquid crystal display device. Accordingly, although the touch panel integrated reflection type liquid crystal display device and the touch panel integrated transmission type liquid crystal display device are not illustrated in the drawings, the present invention may be applied to the reflective liquid crystal display device and the transmissive liquid crystal display device.

4A is a conceptual diagram of an antireflection film, and FIG. 4B is a view for explaining a hard coating film and an antireflection film.

Referring to FIG. 4A, the first light I1 is incident from the air layer to the antireflection film B with an incident angle θ. At this time, the refractive index n _a of air is smaller than the refractive index n _b of the antireflection film B. A portion of the first light I1 is reflected by the second light I2 at an angle equal to the incident angle θ, and a portion of the first light I1 is refracted by the predetermined angle to the anti-reflection film B to be incident to the third light I3.

The third light I3 incident on the anti-reflection film B proceeds toward the C layer, which is a medium. A part of the third light I3 is reflected by the fourth light I4 at the same angle as the incidence angle, and the other part is refracted by the C layer. It enters into the light I5. The refractive index n _c of the C layer is smaller than the refractive index n _b of the antireflection film.

The fourth light I4 reflected by the interface between the anti-reflection film B and the C layer is emitted toward the air layer and refracted to emit the sixth light I6.

In FIG. 4A, when the light travels in a medium having a small refractive index and is reflected by a medium having a large refractive index, that is, when the light travels from the air layer to the antireflection film B and is reflected, the phase is unchanged. On the other hand, when light travels in a medium having a small refractive index and is reflected by a medium having a large refractive index, that is, when the light travels from the antireflection film B to the C layer and is reflected, the phase is changed 180 degrees. However, the transmitted light is invariant in its phase everywhere.

Therefore, while the second light shown in FIG. 4A is reflected without change in phase, the fourth light is emitted as the sixth light by changing its phase by 180 degrees.

As described above, the second light and the sixth light traveling in the direction different from the first light have their maximum strength or minimum due to interference with each other. Therefore, the antireflection effect can be obtained by determining the thickness of the antireflection film where the light is minimized due to the interference.

The thickness of the anti-reflective film whose intensity | strength becomes the minimum by interference of light can be calculated | required by following formula (1).

Here, m is a positive integer including 0, n is the refractive index n _b of the antireflection film B, and λ is the wavelength of light traveling through the air layer.

Equation 1 is established when the refractive index of the antireflection film B is larger or smaller than the refractive indexes of the air layer and the C layer which are in contact with the upper and lower sides of the antireflection film B.

When the above d value is set for 550 nm light that is most sensitive to the human eye, an anti-reflection effect can be obtained for wavelength light around 550 nm light. However, as an antireflection film of a single layer, an antireflection effect can only be expected for light having a wavelength of about 50 nm. Therefore, a plurality of antireflection films are laminated and used.

Referring to FIG. 4B, the hard coating film 390 and the anti-reflection film 395 are sequentially formed on the second polarizing plate 350 of the touch panel 300 illustrated in FIG. 1.

In general, as shown in FIG. 2A, the touch panel integrated liquid crystal display device is pressed by the user's push for tens of thousands to hundreds of thousands of times until the device reaches the end of its lifetime. Therefore, the second polarizing plate 350 can be easily destroyed by this repetitive operation. In order to prevent this, a hard coat layer 390 is formed on the second polarizer 350 to increase the hardness of the second polarizer 350. As an example of the hard coating film 390, it is preferable to use a polyacrylic material.

5A to 5E are diagrams for describing a manufacturing process of a touch panel integrated liquid crystal display according to an exemplary embodiment of the present invention.

First, referring to FIG. 5A, a lower substrate 210 in which thin film transistors (not shown) are arranged in a matrix form is provided. The pixel electrode 220 is formed by applying ITO or IZO to the surface on which the thin film transistor of the lower substrate 210 is formed by sputtering.

Thereafter, the first optical plate 260 including the first retardation plate 280 and the first polarizing plate 270 is formed on the surface opposite to the surface on which the pixel electrode 220 is formed on the lower substrate 210. The first retardation plate 280 is composed of a λ / 2 retardation plate 280a and a λ / 4 retardation plate 280b, and the λ / 4 retardation plate 280b is integrally formed on a surface in contact with the lower substrate 210. Then, the lambda / 2 phase difference plate 280a is integrally formed on the lambda / 4 phase difference plate 280b.

After forming the lambda / 2 phase difference plate 280b, a first polarizing plate 270 for changing the incident light into linearly polarized light oscillating only in a predetermined direction is provided below the lambda / 2 phase difference plate 280a.

In the process of manufacturing the substrate illustrated in FIG. 5A, the pixel electrode 220 is first formed and then the first optical plate 260 is formed. However, the first optical plate 260 is formed on the lower substrate 210. The pixel electrode 220 formed on one surface of the lower substrate 210 and then on the surface opposite to the surface on which the first optical plate 260 of the lower substrate 210 is formed, the object of the present invention can be faithfully performed. Is self-explanatory.

Referring to FIG. 5B, an upper substrate 230 of a liquid crystal display panel having a plurality of color filters (not shown) is provided. The common electrode 240 is formed on one surface of the upper substrate 230 provided with the plurality of color filters. The common electrode 240 is formed by applying ITO or IZO by the sputtering method similarly to the pixel electrode 220.

Referring to FIG. 5C, the liquid crystal panel 200 is completed by combining the lower substrate 210 described with reference to FIG. 5A and the upper substrate 230 described with reference to FIG. 5B.

Referring to FIG. 5D, as shown in FIG. 5C, the surface opposite to the surface on which the common electrode 240 of the upper substrate 230 of the liquid crystal display panel 200 is formed is completed. ITO or IZO is applied to the sputtering method to form the first transparent electrode 310. Thereafter, the dot spacer 320 is formed on the first transparent electrode 310. In this case, since the dot spacer 320 is made of a transparent material, it is not necessary to form a specific position and may be formed randomly on the first transparent electrode 310.

A manufacturing process of forming the touch panel upper substrate 330 will be described with reference to FIG. 5E.

First, the second polarizing plate 350 is provided. The second retardation plate 360 and the second transparent electrode 370 are sequentially formed on one surface of the second polarizing plate 350. The second retardation plate 360 is composed of a λ / 2 retardation plate 360a and a λ / 4 retardation plate 360b, and forms a λ / 2 retardation plate 360a on the second polarizing plate 350, and [Lambda] / 4 phase difference plate 360b is formed again on the / 2 phase difference plate 360a.

The upper panel of the touch panel by the manufacturing process is combined with the liquid crystal display panel described with reference to FIG. 5D. In this case, an adhesive (not shown) is provided at an edge of the second transparent electrode 370 illustrated in FIG. 5E to bond the first transparent electrode 310 of the liquid crystal display panel illustrated in FIG. 5D. The first transparent electrode 310 and the second transparent electrode 370 are spaced apart from each other by an adhesive.

As a result, the touch panel integrated liquid crystal display 100 shown in FIG. 1 is completed.

6A to 6C are views for explaining the manufacturing process of the dot spacer shown in FIG. 5D.

Referring to FIG. 6A, an upper substrate 230 having a first transparent electrode 310 is formed on a surface opposite to a surface on which a plurality of color filters (not shown) are formed, and on the first transparent electrode 310. The organic film 400 is coated to a predetermined thickness.

Referring to FIG. 6B, the upper substrate 230 coated with the organic layer 400 may include a mask 500 including a light transmitting region 510 through which light is transmitted and a light blocking region 520 through which light is not transmitted. Align to phase. After the mask 500 is aligned, an exposure process of supplying UV light to the mask 500 is performed.

The organic layer 400 coated on the first transparent electrode 310 is a kind of negative photoresist, and the UV-received portion is multiplexed.

After the exposure process, a development process is performed to remove a portion that has not received UV light. The dot spacer 320 shown in FIG. 6C is formed by removing the portion not multiplexed by the developer in the above developing step.

After the developing process, a baking process is performed to cure the dot spacer 320. At this time, by appropriately adjusting the heating temperature, the heating time, it is possible to form a dot spacer 320 having a preferred profile.

According to such a touch panel integrated liquid crystal display device, a first transparent electrode of a touch panel is formed on an upper substrate of a liquid crystal display panel, and the optical film, which is the upper substrate of the touch panel, is replaced with an optical plate made of a polarizing plate and a phase difference plate. By eliminating unnecessary substrates, the loss of light passing therethrough can be eliminated, the overall thickness of the product can be reduced, and the cost of the product can be lowered.

In the above, the embodiment of the present invention has been described using the liquid crystal display as an example of an image display device. However, the present invention is not only a liquid crystal display device but also a display device using a plasma or an organic EL display device. It can be applied to various image display devices.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

As described above, according to the present invention, according to the touch panel integrated liquid crystal display device and the manufacturing method thereof, the first transparent electrode of the touch panel is formed on the upper substrate of the liquid crystal display device to remove unnecessary transparent substrates, and A special optical film is removed using an optical plate consisting of a polarizing plate and a retardation plate as the panel upper substrate.

Thus, it is possible to remove unnecessary products such as one transparent substrate and a special optical film to suppress the loss of light passing therethrough, thereby improving the brightness of the light, and to reduce the overall thickness of the product by removing the transparent substrate and the optical film. Can reduce the cost of

Claims (8)

A first transparent electrode formed above the image display means for displaying a predetermined image; A plurality of dot spacers formed on the first transparent electrode; Polarizers spaced apart from each other by a predetermined interval to face the first transparent electrode; A first retardation plate provided on the polarizing plate to face the first transparent electrode; A second retardation plate provided on the first retardation plate; And A second transparent electrode formed on the second retardation plate, The touch panel integrated image display apparatus detects position information by contacting the first transparent electrode and the second transparent electrode. The touch panel integrated image display device according to claim 1, wherein the first retardation plate is a λ / 2 retardation plate, and the second retardation plate is a λ / 4 retardation plate. 3. The liquid crystal display of claim 2, wherein the first retardation plate is provided such that a slow axis of the first retardation plate has an angle of 90 degrees to 180 degrees with a transmission axis of the polarizing plate, and the second retardation plate is formed of the second retardation plate. And a slow axis having an angle of 45 degrees to 135 degrees with respect to the transmission axis of the polarizing plate. The touch panel integrated image display device of claim 1, wherein the dot spacer has an elliptic pillar shape, has a diameter of 10 to 80 μm, and a height of 2 to 10 μm, in contact with the first transparent electrode. The touch panel integrated image display device of claim 1, wherein the touch panel integrated image display device further comprises a hard coating film on a surface opposite to a surface of the polarizing plate on which the first retardation plate is formed. 6. The touch panel integrated image display device according to claim 5, wherein the touch panel integrated image display device further comprises an anti-reflection film laminated on the hard coating film. (a) forming a first transparent electrode on the image display device; (b) forming a dot spacer on the first transparent electrode; (c) a first step comprising a polarizing plate, a second step of sequentially forming a λ / 2 retardation plate and a λ / 4 retardation plate on the polarizing plate so as to face the first transparent electrode, and Forming an upper substrate for a touch panel by a third step of forming a transparent electrode; And (d) combining the image display device formed by the step (b) and the upper substrate for the touch panel formed by the step (c) such that the first transparent electrode and the second transparent electrode face each other. The manufacturing method of the touch panel integrated image display apparatus characterized by the above-mentioned. The method of claim 7, wherein step (b) (b-1) applying an organic film on the first transparent electrode; (b-2) aligning the mask in which the light blocking region and the light transmitting region are formed; (b-3) exposing the organic film by passing light to the light transmitting region of the mask; And (b-4) forming a dot spacer by removing the exposed portion of the organic film.