KR20080036404A - Double-sided liquid crystal display with touch screen panel - Google Patents

Abstract

A bi-directional LCD(Liquid Crystal Display) device with a touch screen panel is provided to enable an LCD panel unit to include a first substrate, of which a side is attached to the touch screen panel unit, and a second substrate attached to the first substrate, and to perform the display of an image on both sides of the LCD panel unit according as a voltage is applied to the LCD panel unit, thereby reducing the number of parts and production cost and improving optical characteristics. A touch screen panel unit(810) is comprised of a first panel unit with light transmittance for a visible ray area and a second panel unit with light transmittance and flexibility for the visible ray area. An LCD panel unit(830) has a first substrate, of which a side is attached to the touch screen panel unit, and a second substrate attached to the first substrate, and performs the display of an image on both sides of the LCD panel unit according as a voltage is applied to the LCD panel unit. A light supply unit(829) is attached to the second substrate of the LCD panel unit and supplies light for both-sided image display to the LCD panel unit. The first panel unit is the first substrate.

Description

Double-sided liquid crystal display with touch screen panel

1 is a schematic diagram illustrating a two-way liquid crystal display device having a touch screen panel according to an embodiment of the present invention;

2A and 2B are schematic views showing a bidirectional liquid crystal display device provided with a touch screen panel as an embodiment of the present invention;

3 is a schematic diagram illustrating a part of the touch screen panel of FIGS. 2A and 2B;

4 is a schematic view showing a modification of FIG.

5 is a schematic view showing another modification of FIG.

6 is a schematic view showing a bidirectional liquid crystal display device having a touch screen panel according to another embodiment of the present invention;

7A and 7B are schematic views showing a two-way liquid crystal display device provided with a touch screen panel as another embodiment of the present invention;

8 and 9 are schematic views illustrating a bidirectional liquid crystal display device according to an exemplary embodiment and another exemplary embodiment, in comparison with a comparative example.

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

500,800 ... two-way liquid crystal display, 510,810 ... touch screen panel,

520,820 ... light guide plate, 529,839 ... light source,

530,830 ... LCD panels.

The present invention relates to a bi-directional liquid crystal display device with a touch screen panel, and more particularly, to a bi-directional liquid crystal display device with a touch screen panel to present a thin structure to improve the optical characteristics and to reduce the price. .

In recent years, the liquid crystal display device has been rapidly improved in image quality due to improvements in liquid crystal materials and development of micro pixel processing technology along with characteristics such as light weight, thinness, and low power consumption, and its application range is gradually widening. to be.

Generally, a liquid crystal display module includes a liquid crystal panel in which liquid crystal is injected between upper and lower glass substrates, a polarizing plate for polarizing light from both sides of the liquid crystal panel, a light source and a light guide plate for supplying a predetermined amount of light to the liquid crystal panel. To display an image signal input from the outside.

A digitizer for displaying an image and simultaneously inputting an electric graphic signal on the displayed screen is mounted on the liquid crystal display device. Such a device is called an EGIP (Electric graphic input panel) or a touch screen panel. Is also called a touch screen or tablet.

When the touch screen panel is applied to the liquid crystal display device, since the touch screen panel is used in the form of physically attaching the touch screen panel to the existing liquid crystal display device structure, the thickness thereof is remarkably increased and optical characteristics are greatly reduced.

Furthermore, when the touch screen panel is mounted in either direction of the bidirectional liquid crystal display device, the overall thickness is further thickened, and the light transmittance property is deteriorated and a Newton ring is generated because the light emitted from the light source must pass through a plurality of structural layers. There is a disadvantage that it adversely affects the quality.

Therefore, the present invention was devised to solve the above-mentioned problems, and by presenting a structure that can be made thin, the number of parts and the manufacturing cost thereof can be reduced, and the optical property can be improved and the touch which can suppress the occurrence of Newton ring. An object of the present invention is to provide a bidirectional liquid crystal display device having a screen panel.

In order to achieve the above object, a bidirectional liquid crystal display device provided with a touch screen panel according to the present invention is bonded to a first panel portion and a first panel portion that are light transmissive to a visible light region, and has a light transmissive characteristic to a visible light region. A touch screen panel portion comprising a flexible second panel portion, and a first substrate having one surface attached to the touch screen panel portion and a second substrate bonded to the first substrate have images on both sides according to whether voltage is applied. And a light supply unit which is bonded to a liquid crystal panel unit for performing display and a second substrate of the liquid crystal panel unit, and which supplies light for double-sided image display to the liquid crystal panel unit, wherein the first panel unit is a first substrate. .

Here, a plurality of protrusions having a predetermined shape for maintaining a distance between the first panel portion and the second panel portion is provided on the first panel portion, each of the protrusions is formed of 1 ~ 200 ㎛ in diameter, 1 ~ 200 ㎛ in height desirable.

Alternatively, a transparent conductive film may be formed on the first panel portion, and the protrusion may be formed on the transparent conductive film, or a transparent conductive film may be formed on the first panel portion on which the protrusion and the protrusion are not formed. A transparent conductive film may be formed on the one panel portion.

In this case, the transparent conductive film is preferably any one selected from the group consisting of indium tin oxide, zinc oxide and indium zinc oxide.

In addition, the second panel portion may include a polarizing plate, and the transparent conductive film may be provided on one surface of the polarizing plate which is bonded to the first panel portion.

In this case, the liquid crystal panel unit includes a first substrate having one surface connected to the touch screen panel portion and a thin film transistor formed on the other surface thereof, a liquid crystal layer connected to the other surface of the first substrate, and a second liquid crystal layer connected to the liquid crystal layer. One surface is bonded to the substrate and the second substrate, and a rear surface thereof includes a polarizing plate connected to the light supply unit, and the polarizing plate or the first substrate is preferably provided with a reflective member.

The light supply unit may include a light guide plate having a prism formed on one surface thereof, and a light source disposed on one side of the light guide plate to supply light to the light guide plate, wherein one surface on which the prism of the light guide plate is formed is bonded. One surface adjacent to the other surface of the negative portion or on which the prism of the light guide plate is formed may be disposed on the rear surface of the liquid crystal panel portion to which the light supply unit is bonded.

Hereinafter, an embodiment of a bidirectional liquid crystal display device having a touch screen panel according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a two-way liquid crystal display device provided with a touch screen panel according to an embodiment of the present invention, Figures 2a and 2b is a two-way liquid crystal display device provided with a touch screen panel as an embodiment of the present invention It is a schematic diagram showing.

The bidirectional liquid crystal display device 800 having the touch screen panel according to an exemplary embodiment of the present invention is bonded to the first panel portion and the first panel portion that are light transmissive to the visible light region, and has a light transmissive characteristic to the visible light region. A second panel portion having flexibility, and a touch screen panel portion 810 to which a signal is input by applying an external contact to the second panel portion, and one surface of the touch screen panel portion 810 are bonded to each other. The liquid crystal panel 830 of the transflective mode for performing image display on both sides according to whether or not is applied, the light guide plate 820 and the light guide plate fused with the other surface of the liquid crystal panel 830 and diffuses the light for the double-sided image display ( The light source 829 emits light to the liquid crystal panel 830 through the 820.

The liquid crystal panel 830 emits light emitted from the light source 829 and reaches through the light guide plate 820 in both directions, that is, in the direction in which the touch screen panel 810 is provided and in the direction in which the light guide plate 820 is provided. The display is possible, and the light emitting surface of the touch screen panel 810 may be inputted by external contact.

Referring to FIG. 2A and FIG. 2B, the bi-directional liquid crystal display device 800 having the touch screen panel will be described in more detail. The touch screen panel portion may include the flexible polarizer 815 and the transparent electrode 821 having the transparent electrode 813 formed thereon. The substrate 837 is formed by bonding of the formed substrates 837, and protrusions 812 are formed on the substrates 837 to keep the gap between the polarizing plate 815 and the substrates 837.

The touch screen panel unit is for a user to input information into the liquid crystal display device, and includes a capacitive overlay, a resistive overlay, an infrared beam, and an integrated tension measurement method. (Integral Strain guage), surface acoustic wave (Surface Acoustic Wave), Piezo Electric (Piezo Electric), etc. can be used in all types of touch screen panel unit.

Among these, the pressure-sensitive resistive touch screen panel portion includes a flexible polarizing plate 815 and a substrate 837 bonded to the polarizing plate 815. At this time, an adhesive member (not shown) for bonding the polarizing plate 815 and the substrate 837 may be further included, and the adhesive member is preferably a double-sided tape.

In the substrate 837, a transparent electrode 811, such as an indium tin oxide, zinc oxide, or indium zinc oxide layer, is generally formed and may be formed of a rigid material having a supporting force.

The polarizing plate 815 is made of a flexible material, and the protrusions 812 are formed at regular intervals such that the touch sensor (not shown), the polarizing plate 815, and the substrate 837 are non-contacted between the polarizing plate 815 and the substrate 837. Is placed.

In the substrate 837, the transparent electrode 835 is formed not only on one surface of the substrate 837 but also on the rear surface of the substrate 837, and a thin film transistor may be formed.

When the touch screen panel of the pressure resistive touch screen panel having the structure as described above is applied with a constant current at both ends of the resistive film, the resistive film acts like a resistor having a resistive component, thereby applying voltage to both ends. At this time, when pressure is applied to the polarizing plate 815 of the touch screen panel unit by external contact or the like, the polarizing plate 815 is bent to contact the substrate 837.

As described above, when the polarizing plate 815 and the substrate 837 are in contact with each other, the resistance components on the two surfaces form a parallel connection of the resistors, the resistance value changes, and the voltage changes due to the current flowing through both ends. By measuring the degree of change of the voltage it is possible to detect the position pressed by the user, and transmits the detected position signal to a separate controller (not shown).

That is, when the user presses the flexible polarizer 815 of the touch screen panel unit, a signal generated by the contact between the polarizer 815 and the substrate 837 is transmitted to the controller.

When a signal is transmitted to the controller as described above, the controller detects a change in the voltage of the pressed region. The analog signal according to the sensed change in voltage is converted into a digital signal by the A / D converter in the controller, and the converted signal is transmitted to the microcontroller in the controller. The microcontroller generates coordinates according to a signal converted into a digital signal and transfers the coordinates to a driver, wherein the driver manipulates an image displayed on a liquid crystal panel region corresponding to the input coordinates using an input tool such as a mouse. It works the same.

The liquid crystal panel 830 is provided with a polarizing plate 838 that is in contact with the light guide plate 820, and a color filter in a rear direction of a surface that is connected to the polarizing plate 838 on the substrate 831 that is in contact with the polarizing plate 838. 832 and a transparent electrode 833 are provided, a liquid crystal 834 is provided, and a substrate 837 on which a transparent electrode 835 and a thin film transistor (not shown) are formed.

In the substrate 837, a transparent electrode 835 is formed on one surface of the substrate 837, as well as a rear surface thereof, and a thin film transistor is formed, that is, transparent electrodes 811 and 835 are formed on both sides of the substrate 837, respectively. The touch screen panel part is comprised in the surface by which the transparent electrode 811 was formed, and the liquid crystal panel part is comprised in the back surface.

In other words, the substrate 837 may serve as a thin film transistor substrate of the liquid crystal panel 830 and as a first panel portion of the touch screen panel portion.

The light emitted from the light source 829 and emitted through the light guide plate 820 reaches the polarizer 815 via the liquid crystal 834 via the color filter 832, and transmits a part of the light through the polarizer 815. Reflect the rest. For this purpose, the polarizing plate 815 is preferably a polarizing plate 815 provided with a reflective member.

Alternatively, the light emitted from the light source 829 and emitted through the light guide plate 820 passes through the liquid crystal 834 via the color filter 832 to the substrate 837 on which the thin film transistor is formed, and the thin film transistor is formed. The substrate 837 transmits part of light and reflects part of the light. For this, it may be preferable that the reflective member is provided on the substrate 837 on which the thin film transistor is formed.

In the arrangement of the light guide plate 820, the surface on which the prism of the light guide plate 820 is formed may face the liquid crystal panel 830 as shown in FIG. 2A, and the surface on which the prism of the light guide plate 820 is formed may be a liquid crystal as shown in FIG. 2B. The panel 830 may have a structure facing away from the panel 830.

As shown in FIG. 2A, when the surface on which the prism of the light guide plate 820 is formed has a structure facing the liquid crystal panel 830, the light emitted from the light source 829 is capable of condensing a large amount in the direction of the liquid crystal panel 830 so that the light Since the efficiency, ie, the amount of light reaching the user's eyes may be higher than the amount of light emitted from the light source 829, the visibility of the user outside the direction of the touch screen panel may be further improved.

On the other hand, when the surface on which the prism of the light guide plate 820 is formed has a structure facing outward as shown in FIG. 2B, the light is further focused and emitted toward the outside of the light guide plate 820 so that the light guide plate 820 is disposed outside the surface. The visibility of the user can be further improved.

3 is a schematic diagram illustrating a part of the touch screen panel of FIGS. 2A and 2B.

As shown in FIG. 3, a transparent electrode 811 is formed on one surface of the substrate 837, and protrusions 812 are formed on the transparent electrode 811.

One surface of the substrate 837 on which the transparent electrode 811 is formed is a rear surface of the surface bonded to the substrate 831 (FIG. 2A), and the transparent electrode 811 may be formed by physical or chemical vapor deposition. have.

The projection 812 is formed on the transparent electrode 811. The protrusion 812 is to maintain a gap between the polarizing plate 815 and the substrate 837, and may be formed by a deposition method or the like.

The protrusion 812 may be formed of the same material as the substrate 837, and may be a transparent insulator.

The projection 812 for maintaining the gap between the polarizing plate 815 and the substrate 830 preferably has a diameter of 1 to 200 μm and a height of 1 to 200 μm.

When the diameter is less than 1 μm, the polarizing plate 815 may be easily damaged by stress. When the diameter is more than 200 μm, an excessive area may be occupied on a plane, resulting in interference of light. The diameter of the projection 812 is preferably 1 to 200 µm.

When the height is less than 1 μm, there is no profit to maintain the gap between the polarizing plate 815 and the substrate 837. When the height is more than 200 μm, the excess gap is set, so that the height of the protrusion 812 is 1-200 micrometers is suitable.

4 is a schematic view showing a modification of FIG.

In the modification of FIG. 4, the projection 622 is formed on the substrate 620, and on the substrate 620 and the projection 622 other than the region where the projection 622 is formed, that is, on the entire structure, a transparent electrode ( 621a and 621b are formed collectively.

The protrusion 622 may have a structure to be attached arbitrarily to the substrate 620, the transparent electrode 621a formed on the projection 622 and the transparent electrode 813 formed on the polarizing plate 815 (Fig. 2A); ) May be applied in the manner of contacting by pressing to calculate the pressing position by energization.

5 is a schematic view showing another modified example of FIG.

In another modification of FIG. 5, the protrusion 722 is formed on the substrate 720, and the transparent electrode 721a is formed on the substrate 720 other than the region where the protrusion 722 is formed.

Such a structure is a form in which the transparent electrode 621b formed on the protrusion 622 in the modified example of FIG. 4 is etched, and the operation method according to this structure may be the resistive film method described above.

Due to the structure as described above, it is possible to have a relatively thin structure compared to the bidirectional liquid crystal display device provided with a conventional touch screen panel, and to reduce the cost and improve the optical characteristics due to the reduction of the application member according to the thin In addition, light can pass through a relatively smaller number of media, thereby improving the occurrence of Newton's rings.

Hereinafter, with reference to the accompanying drawings will be described in detail another embodiment of a two-way liquid crystal display device provided with a touch screen panel according to the present invention.

FIG. 6 is a schematic view showing a bidirectional liquid crystal display device having a touch screen panel according to another embodiment of the present invention, and FIGS. 7A and 7B are bidirectional liquid crystal display devices having a touch screen panel as another embodiment of the present invention. It is a schematic diagram showing.

In the bi-directional liquid crystal display device 500 having a touch screen panel according to another exemplary embodiment of the present invention, a signal is input by contact and a touch screen panel portion configured to be transparent to a visible light region and the touch screen panel portion are bonded to each other. And a liquid crystal panel of a transflective mode for performing image display on both surfaces according to whether voltage is applied thereto.

As shown in FIG. 6, in the bidirectional liquid crystal display 500 provided with the touch screen panel according to another embodiment of the present invention, a signal is input by external contact or the like and has at least a light transmissive characteristic to a visible light region. The screen panel 510 includes a light guide plate 520 and a liquid crystal panel 530 bonded thereto.

Here, the light source 529 is attached to the light guide plate 520.

The liquid crystal panel 530 emits light emitted from the light source 529 and reaches the light guide plate 520 in both directions, that is, in a direction opposite to that provided with the touch screen panel 510, to display an image. The light emitting surface of the touch screen panel 510 may be inputted by external contact.

Referring to FIGS. 7A and 7B, the bidirectional liquid crystal display device 500 having the touch screen panel is described in more detail. The touch screen panel portion may include the flexible polarizer 515 and the transparent electrode 521 having the transparent electrode 513. The light guide plate 520 is bonded to each other, and the light guide plate 520 is provided with a protrusion 522 to maintain the gap by separating the polarizing plate 515 and the light guide plate 520 from each other.

The touch screen panel unit is for a user to input information into the liquid crystal display device, and includes a capacitive overlay, a resistive overlay, an infrared beam, and an integrated tension measurement method. (Integral Strain guage), surface acoustic wave (Surface Acoustic Wave), Piezo Electric (Piezo Electric), etc. can be used in all types of touch screen panel unit. In the present embodiment, a pressure resistive touch screen panel will be described as an example.

That is, the pressure resistive touch screen panel part includes a flexible polarizing plate 515 and a light guide plate 520 bonded to the polarizing plate 515. In this case, an adhesive member (not shown) for bonding the polarizing plate 515 and the light guide plate 520 may be further included, and the adhesive member is preferably a double-sided tape.

The light guide plate 520 is generally formed of a transparent electrode 521 such as an indium tin oxide, zinc oxide, or indium zinc oxide film, and may be made of a rigid material having a supporting force, and supplies light to the liquid crystal panel 530. .

The polarizing plate 515 is made of a flexible material, and the protrusions 522 are formed at regular intervals so that the touch sensor (not shown), the polarizing plate 515, and the light guide plate 520 are non-contacted between the polarizing plate 515 and the light guide plate 520. Is placed.

When the touch screen panel of the pressure resistive touch screen panel having the structure as described above is applied with a constant current at both ends of the resistive film, the resistive film acts like a resistor having a resistive component, thereby applying voltage to both ends. At this time, when pressure is applied to the polarizing plate 515 of the touch screen panel unit by external contact or the like, the polarizing plate 515 is bent to contact the light guide plate 520.

As described above, when the polarizing plate 515 and the light guide plate 520 are in contact with each other, the resistance components of the two surfaces form a parallel connection of the resistors, the resistance value changes, and the voltage changes due to the current flowing through both ends. By measuring the degree of change of the voltage it is possible to detect the position pressed by the user, and transmits the detected position signal to a separate controller (not shown).

That is, when the user presses the flexible polarizer 515 of the touch screen panel unit, a signal generated by the contact between the polarizer 515 and the light guide plate 520 is transmitted to the controller.

When a signal is transmitted to the controller as described above, the controller detects a change in the voltage of the pressed region. The analog signal according to the sensed change in voltage is converted into a digital signal by the A / D converter in the controller, and the converted signal is transmitted to the microcontroller in the controller. The microcontroller generates coordinates according to a signal converted into a digital signal and transfers the coordinates to a driver, wherein the driver manipulates an image displayed on a liquid crystal panel region corresponding to the input coordinates using an input tool such as a mouse. It works the same.

In this configuration, as shown in FIG. 7B, the top film 514 may be further provided between the polarizing plate 515 and the transparent electrode 521, wherein the top film 514 also has flexibility. desirable.

In the liquid crystal panel 530, the color filter 532 and the transparent electrode 533 are disposed in the rear direction of the surface where the light guide plate 520 is connected to the substrate 531 which is connected to the light guide plate 520 to which the light source 529 is attached. A liquid crystal 534 is provided, and a substrate 537 and a polarizer 538 having a transparent electrode 535 and a thin film transistor (not shown) are provided.

Light emitted from the light source 529 and emitted through the light guide plate 520 reaches the polarizer 538 via the liquid crystal 534 via the color filter 532, and transmits a part of the light through the polarizer 538. Reflect the rest. For this purpose, the polarizing plate 538 is preferably a polarizing plate 538 having a reflective member.

Alternatively, the light emitted from the light source 529 and emitted through the light guide plate 520 passes through the liquid crystal 534 through the color filter 532 to the thin film transistor, and transmits a part of the light in the thin film transistor. And reflect the rest. To this end, it may be preferable that the reflective member is provided on the substrate 537 on which the thin film transistor is formed.

8 and 9 illustrate the bidirectional liquid crystal display according to the exemplary embodiment and the other exemplary embodiment in comparison with the comparative example.

8 and 9, in the comparative example, in order to manufacture a bidirectional liquid crystal display device having a touch screen panel, the touch screen panel unit 100, the first liquid crystal display device 200 and the second liquid crystal that are bonded thereto are provided. A display device 300 is provided, and the first liquid crystal display device 200 and the second liquid crystal display device 300 are configured in directions in which their display screens are opposite.

Each of the first liquid crystal display device 200 and the second liquid crystal display device 300 includes light guide plates 230 and 330 and liquid crystal panels 210 and 310 to which light sources 220 and 320 are separately attached, respectively. The display screen of the first liquid crystal display device 200 can be displayed on the display screen of the first liquid crystal display device 200, and the touch screen panel unit 100 is bonded to the display screen.

In the comparative example of the bi-directional liquid crystal display device provided with the touch screen panel, the touch screen panel unit 100 is bonded to the lower film 110 and the flexible upper film 120 on which the transparent electrodes 111 and 121 are formed. The lower film 110 is provided with a protrusion 115 to maintain the gap by separating the upper film 120 and the lower film 110 from each other.

In addition, the first liquid crystal display 200 includes a polarizer 219 formed on the light guide plate 230, and a substrate 218 and a liquid crystal 215 on which a thin film transistor (not shown) and a transparent electrode 216 are formed. Subsequently, the substrate 212 and the polarizing plate 211 including the transparent electrode layer 214 and the color filter 213 are provided. The touch screen panel unit 100 is disposed outside the polarizing plate 211. Are coalesced.

In the second liquid crystal display device 300, a polarizing plate 311 is formed on the light guide plate 330, and a substrate 312 having a transparent electrode layer 314 and a color filter 313 and a liquid crystal 315 are sequentially formed. Subsequently, the substrate 318 and the polarizer 319 on which the thin film transistor (not shown) and the transparent electrode 316 are formed are provided.

In the case of having such a structure, it is substantially the same as the form in which a pair of liquid crystal display devices 200 and 300 and the touch screen panel unit 100 are simply attached. It's just like sum.

On the other hand, in the structure of one embodiment of the present invention and another embodiment of the present invention is provided with one touch screen panel, a light guide plate and a liquid crystal panel, each one conventional touch screen panel unit 100 and a pair of light guide plates 230 , 330 and the liquid crystal panels 210 and 310 may be thinner than in a structure having the same.

That is, in one embodiment of the present invention, the substrate of the liquid crystal panel is used as the bottom film of the touch screen panel unit, and only one liquid crystal panel is provided. In another embodiment of the present invention, the bottom film of the touch screen panel unit is integrally formed with the light guide plate. By using only one liquid crystal panel, a thickness close to half as compared with the comparative example can be presented, and the number of light sources supplying light can be reduced by the structure having one light guide plate.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

For the purpose of the above, in one embodiment of the present invention, a configuration in which the thin film transistor substrate of the liquid crystal panel unit is used as another panel unit for the panel unit having flexibility of the touch screen panel unit is presented, but the color filter substrate of the liquid crystal panel unit is Other panel units may also be used.

As described above, the bidirectional liquid crystal display device having the touch screen panel according to the present invention can reduce the number of parts and the manufacturing cost thereof by presenting a structure that can be thinned.

In addition, the present invention can improve the optical properties and suppress the occurrence of Newton ring.

Claims (13)

A touch screen panel portion including a first panel portion that is light transmissive to the visible light region and a second panel portion that is bonded to the first panel portion and that is light transmissive and flexible to the visible light region; A liquid crystal panel unit including a first substrate having one surface attached to the touch screen panel unit and a second substrate bonded to the first substrate to display an image on both surfaces according to whether voltage is applied; And A light supply unit which is bonded to the second substrate of the liquid crystal panel unit and supplies light for displaying a double-sided image to the liquid crystal panel unit; Including; And the first panel portion is the first substrate. The liquid crystal display device of claim 1, wherein a plurality of protrusions having a predetermined shape for maintaining a distance between the first panel portion and the second panel portion are provided on the first panel portion. The liquid crystal display device of claim 2, wherein each of the plurality of protrusions of the first panel portion is formed to have a diameter of 1 to 200 μm and a height of 1 to 200 μm. The liquid crystal display device according to claim 2, wherein a transparent conductive film is formed on the first panel portion, and the protrusion is formed on the transparent conductive film. The liquid crystal display of claim 2, wherein a transparent conductive film is formed on the first panel portion where the protrusion and the protrusion are not formed. The liquid crystal display of claim 2, wherein a transparent conductive film is formed on the first panel portion where the protrusion is not formed. The liquid crystal display according to any one of claims 4 to 6, wherein the transparent conductive film is any one selected from the group consisting of indium tin oxide, zinc oxide and indium zinc oxide. Device. The liquid crystal display device of claim 1, wherein the second panel portion comprises a polarizing plate, and the polarizing plate is provided with a transparent conductive film on one surface bonded to the first panel portion. The liquid crystal panel of claim 1, wherein A first substrate having one surface connected to the touch screen panel portion and having a thin film transistor formed on the other surface thereof, a liquid crystal layer connected to the other surface of the first substrate formed thereon, a second substrate connected to the liquid crystal layer and formed of a color filter And one surface bonded to the second substrate, and a rear surface of the second substrate includes a polarizing plate connected to the light supply unit. 10. The liquid crystal display of claim 9, wherein the polarizing plate or the first substrate is provided with a reflective member. The liquid crystal display device of claim 1, wherein the light supply unit comprises a light guide plate having a prism formed on one surface thereof, and a light source disposed on one side of the light guide plate to supply light to the light guide plate. The liquid crystal display of claim 11, wherein one surface of the light guide plate on which the prism is formed is adjacent to the other surface of the liquid crystal panel unit to which the light supply unit is joined. The liquid crystal display of claim 11, wherein one surface of the light guide plate on which the prism is formed is disposed on a rear surface of the liquid crystal panel unit to which the light supply unit is bonded.

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