KR20130091920A - Backlight unit and liquid crystal display module having the same - Google Patents

Abstract

Liquid crystal display module for a double-sided display according to the present invention comprises a first liquid crystal panel and a second liquid crystal panel spaced apart at regular intervals; A first upper substrate formed on a front surface of the first liquid crystal panel and a first lower substrate formed on a rear surface of the first liquid crystal panel; A second upper substrate formed on the front surface of the second liquid crystal panel and a second lower substrate formed on the rear surface of the second liquid crystal panel; An organic light emitting device integrally formed on a rear surface of the first lower substrate or the second lower substrate; And a seal pattern formed along an edge between the first lower substrate and the second lower substrate.

Description

Backlight unit and liquid crystal display module having the same {Backlight unit and liquid crystal display module having the same}

The present invention relates to a backlight unit and a liquid crystal display module having the same, and more particularly, to a liquid crystal display module for a double-sided display using an organic light emitting device as a light source of the backlight unit.

A general liquid crystal display device is composed of a liquid crystal display module and a driving circuit portion for driving the liquid crystal display module. The liquid crystal display module includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix form between two glass substrates, and a back light unit for irradiating light to the liquid crystal panel.

Also, in the liquid crystal display module, optical members for diffusing, polarizing and condensing light traveling from the backlight unit toward the liquid crystal panel are sequentially arranged. The liquid crystal panel and the backlight unit should be fastened in an integrated form to prevent light loss and should be protected from being damaged by external shocks. To this end, a case formed to surround the backlight unit including the edge of the liquid crystal panel is provided.

The liquid crystal panel implements an image by adjusting light transmittance. Since the liquid crystal panel does not emit light by itself, it requires a backlight unit that provides a separate light source. As the light source, electroluminescence (EL), a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), a light emitting diode (LED), or the like may be used.

The backlight unit may be classified into a side light type and a direct light type according to the shape of the light source.

In the metering type, the light source is disposed on the lower side of the liquid crystal panel. The light guide plate is used to change the traveling direction of the light irradiated in the lateral direction of the liquid crystal panel to the vertical direction of the liquid crystal panel, and the liquid crystal panel using a plurality of optical members. It is advantageous to slim down the liquid crystal display by reducing the thickness of the backlight unit by irradiating light onto the front surface of the backlight unit. In contrast, in the direct type method, a plurality of light sources such as fluorescent lamps or light emitting elements (LEDs) are disposed on the rear surface of the liquid crystal panel to directly irradiate light directly over the entire surface of the liquid crystal panel. Such a direct type method is advantageous in the application of a large LCD due to the high uniformity and brightness of light irradiated onto the liquid crystal panel.

On the other hand, in recent years, there is an increasing demand for an electronic device capable of displaying an image on both sides of the display device. Such an electronic device includes a liquid crystal display module for a double-sided display. Currently, a backlight unit having an LED light source is mainly used for a liquid crystal display module for a double-sided display which is commercialized or developed.

1 is a view schematically showing one cross section of a liquid crystal display module for a double-sided display according to the prior art.

Referring to FIG. 1, the liquid crystal display module 100 for a double-sided display includes first and second liquid crystal panels 110 and 130 for displaying an image by adjusting light transmittance of liquid crystals according to input image data, and a direct type LED. The backlight unit 120 emits light in both directions using a light source. In this case, the first liquid crystal panel 110 is positioned above the backlight unit 120, and the second liquid crystal panel 130 is positioned below the backlight unit 120.

In addition, the double-sided display liquid crystal display module 100 is formed on the upper and lower polarizing plates 140 and 150 formed on the front and rear of the first liquid crystal panel 110 and on the front and rear of the second liquid crystal panel 130. Upper and lower polarizers 160 and 170.

The first and second liquid crystal panels 110 and 130 each have a thin film transistor (TFT) array substrate 111 and 131 bonded to each other, a color filter substrate 113 and 133, and a cell gap between the two substrates. And a liquid crystal layer 115 and 135 filled in the space provided by the spacer.

The liquid crystal panels 110 and 130 include a thin film transistor TFT formed in a pixel region defined by n gate lines and m data lines, and a liquid crystal cell connected to a TFT. In addition, lower polarizers 140 and 160 are formed on rear surfaces of the TFT array substrates 111 and 131 of the liquid crystal panels 110 and 130, and upper polarizers 150 and 150 are formed on upper surfaces of the color filter substrates 113 and 133. 170) is formed.

The backlight unit 120 is disposed between the first liquid crystal panel 110 and the second liquid crystal panel 130. The backlight unit 120 includes an LED light source unit 125 for generating light in a vertical direction, first and second diffusion sheets 121 and 127 for diffusing light emitted from the LED light source unit 125, and the first And first and second optical sheets 123 and 129 for polarizing and condensing the light emitted from the second diffusion sheets 121 and 127.

The LED light source unit 125 is a printed circuit board (PCB, not shown) mounted with an LED device (not shown) for generating light in both directions of the liquid crystal display module 100 and a circuit for controlling light emission of the LED device. It is composed. In this case, the LED device emits white light with a point light source, and the printed circuit board supports the LED device and controls light emission of the LED device by a circuit configured therein. In addition, the LED light source unit 125 may further include a light guide plate (not shown) for supporting the LED device and guiding light in both directions of the liquid crystal display module 100.

The first and second optical sheets 123 and 129 may include a prism sheet (not shown) and a light collecting sheet (not shown) that polarize and condense the light emitted from the first and second diffusion sheets 121 and 127, respectively. Include. When the light incident on the first and second liquid crystal panels 110 and 130 is perpendicular to each other, the light efficiency is greatest. To this end, the first and second optical sheets 123 and 129 are disposed on the first and second diffusion sheets 121 and 127. That is, the first and second optical sheets 123 and 129 vertically generate light emitted from the diffusion sheets 121 and 127 to improve light efficiency.

Light irradiated from the first and second diffusion sheets 121 and 127 is incident on the first and second liquid crystal panels 110 and 130 via the first and second optical sheets 123 and 129. In this case, the first and second liquid crystal panels 110 and 130 use light incident from the first and second optical sheets 123 and 129 of the backlight unit 120 to display images on both sides of the liquid crystal display module 100. Can be implemented.

However, since the conventional backlight unit 120 includes a light guide plate, a diffusion sheet, and an optical sheet, the thickness of the conventional backlight unit 120 increases, and accordingly, the liquid crystal display module 100 having the backlight unit 120 is provided. The thickness also has a problem of increasing. In addition, since the LED light source used in the conventional backlight unit 120 is a point light source instead of a surface light source, a liquid crystal display module using the LED light source has a problem in that display quality is not so good.

The present invention has been made to solve the problems of the prior art as described above, by using an organic light emitting diode (OLED) as a light source of the backlight unit to reduce the thickness of the liquid crystal display module and at the same time improve visibility. A liquid crystal display module for a double sided display can be proposed.

The present invention provides a liquid crystal panel comprising: a first liquid crystal panel and a second liquid crystal panel spaced apart from each other at regular intervals; A first upper substrate formed on a front surface of the first liquid crystal panel and a first lower substrate formed on a rear surface of the first liquid crystal panel; A second upper substrate formed on the front surface of the second liquid crystal panel and a second lower substrate formed on the rear surface of the second liquid crystal panel; An organic light emitting device integrally formed on a rear surface of the first lower substrate or the second lower substrate; And it provides a liquid crystal display module for a double-sided display including a seal pattern formed along the edge between the first lower substrate and the second lower substrate.

The liquid crystal display module for a double-sided display according to an exemplary embodiment of the present invention does not require the use of a light guide plate, a diffusion sheet, and an optical sheet, so that a liquid crystal display module having a thin thickness can be implemented. In addition, the liquid crystal display module for a double-sided display uses transparent OLED as a light source of the backlight unit, thereby saving power consumption and improving visibility compared to a conventional LED light source.

Meanwhile, various other effects will be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 is a cross-sectional view of a conventional liquid crystal display module for a double-sided display;
2 is a cross-sectional view of a liquid crystal display module for a double-sided display according to an embodiment of the present invention;
3 is an enlarged cross-sectional view of a backlight unit according to an exemplary embodiment of the present disclosure;
4 is an enlarged cross-sectional view of a backlight unit according to another exemplary embodiment of the present disclosure;
5 is a view illustrating an example in which glass is used instead of a polarizing plate as a substrate of a transparent OLED in a liquid crystal display module for a double-sided display according to an exemplary embodiment of the present invention;
6A and 6B illustrate a refrigerator including a liquid crystal display module for a double-sided display according to an exemplary embodiment of the present invention;
7 is a view showing a show case device having a liquid crystal display module for a double-sided display according to an embodiment of the present invention;
8 is a view showing a vehicle display apparatus having a liquid crystal display module for a double-sided display according to an embodiment of the present invention;
9 is a view showing a mobile terminal having a liquid crystal display module for a double-sided display according to an embodiment of the present invention.

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

2 is a schematic cross-sectional view of a liquid crystal display module for a double-sided display according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the double-sided display liquid crystal display module 200 may include a first liquid crystal panel 210 and a second liquid crystal panel 230 that display an image by adjusting the light transmittance of the liquid crystal according to the input image data; The backlight unit 220 irradiates light in both directions using the transparent OLED light source. In this case, the first liquid crystal panel 210 is positioned above the backlight unit 220, and the second liquid crystal panel 230 is positioned below the backlight unit 220.

In addition, the double-sided display liquid crystal display module 200 is formed on the upper and lower polarizing plates 240 and 250 formed on the front and rear of the first liquid crystal panel 210 and on the front and rear of the second liquid crystal panel 230. Upper and lower polarizers 260 and 270.

The first liquid crystal panel 210 has a constant cell gap between the first TFT (Thin Film Transistor) array substrate 211, the first color filter substrate 213, and the two substrates 211 and 213 bonded to each other. And a first liquid crystal layer 215 filled in the space provided by the spacer.

The second liquid crystal panel 230 has a constant cell gap between the second TFT (Thin Film Transistor) array substrate 231, the second color filter substrate 233, and the two substrates 231 and 233 bonded to each other. And a second liquid crystal layer 235 filled in the space provided by the spacer and the space provided by the spacer.

Each of the first and second color filter substrates 213 and 233 includes a plurality of pixels each consisting of red, green, and blue sub-pixels, and a color of red, green, or blue when light is applied. In this case, the pixels may be composed of red, green, and blue subpixels, but the red, green, blue, and white subpixels constitute one pixel. It is not limited.

The first and second TFT array substrates 211 and 231 are elements in which switching elements are formed, respectively, and may switch pixel electrodes (not shown). For example, the common electrode (not shown) and the pixel electrode may change the molecular arrangement of the first and second liquid crystal layers 215 and 235 according to a predetermined voltage applied from the outside.

The first and second liquid crystal layers 215 and 235 are composed of a plurality of liquid crystal molecules, and the liquid crystal molecules change their arrangements corresponding to the voltage difference generated between the pixel electrode and the common electrode. As a result, the light provided from the backlight unit 220 may be incident on the first and second color filter substrates 213 and 233 according to a change in the molecular arrangement of the first and second liquid crystal layers 215 and 235.

The first lower polarizer 240 is formed on the rear surface of the first TFT array substrate 211, and the first upper polarizer 250 is formed on the upper surface of the first color filter substrate 213. In addition, a second lower polarizer 260 is formed on a rear surface of the second TFT array substrate 231, and a second upper polarizer 270 is formed on an upper surface of the second color filter substrate 233.

The first and second upper polarizers 250 and 270 and the first and second lower polarizers 240 and 260 respectively have separate polarization axes, and the upper and lower polarizers 240 and 260 of the upper polarizers 250 and 270, respectively. Lower polarization axes are orthogonal to each other. The upper and lower polarization axes are light absorption axes that absorb light components in a direction parallel to themselves among incident light. Thus, the upper and lower polarizers can polarize the incident light into light having one directional component.

In addition, the first lower flat plate 240 is used as the backlight unit 220, more specifically, the first substrate for growing and supporting the organic light emitting diode, and the second lower polarizer 260 encapsulates the organic light emitting diode ( It is used as a second substrate for incapsulation.

The backlight unit 220 is integrally formed on the rear surface of the first liquid crystal panel 210, more specifically, the rear surface of the first lower polarizer 240. In addition, although not shown in the drawings, the backlight unit 220 may be integrally formed on the rear surface of the second liquid crystal panel 230, more specifically, the rear surface of the second lower polarizer 260. That is, the backlight unit 220 may be formed on the rear surface of any one of the first lower polarizer 240 and the second lower polarizer 260.

The backlight unit 220 is composed of a transparent OLED and generates a surface light source. Therefore, the backlight unit 220 may supply a light source having a uniform luminance as compared to an LED light source which is a conventional point light source. In addition, the backlight unit 220 using the transparent OLED does not require the use of a light guide plate, a diffusion sheet, and an optical sheet, and thus may implement a thin liquid crystal display module. Meanwhile, a detailed description of the structure of the backlight unit 220 will be described later.

The seal pattern 245 is formed at an edge between the first lower polarizer 240 and the second lower polarizer 260. In this case, the seal pattern 245 may be formed through UV (ultraviolet) sealing or laser sealing.

The seal pattern 245 may be generally made of a sealant made of an organic or polymer material, or may be made of a sealant in which a viscous solvent and metal particles are mixed. The seal pattern 245 is bonded between the first lower polarizer 240 and the second lower polarizer 260 to prevent contamination of external sources such as moisture or gas from penetrating into the transparent OLED.

Through the seal pattern 245, an air gap 255 is formed between the backlight unit 220 and the second liquid crystal panel 230. At this time, the air gap 255 is preferably maintained in a vacuum state.

3 is an enlarged cross-sectional view of the backlight unit according to an exemplary embodiment.

Referring to FIG. 3, the backlight unit 220 according to an exemplary embodiment of the present invention is formed of a transparent OLED that generates surface light sources in both directions, and is integrally formed on the rear surface of the first lower polarizer 240.

The backlight unit 220 includes an anode 221, a hole transport layer 223, an emission layer 225, an electron transport layer, and the like, sequentially stacked from the rear surface of the first lower polarizer 240. 227 and a cathode 229. At this time, since the light emitting layer 225 is usually transparent, transparent OLEDs can be formed by making both electrodes 221 and 229 transparent.

The backlight unit 220 is a self-luminous element, which injects electrons and holes into the light emitting layer 225 from the electron injection electrode (cathode) and the hole injection electrode (anode), respectively, and excitons in which the injected electrons and the electrons are combined. It emits light using energy emitted while falling from the excited state to the ground state. Accordingly, in the liquid crystal display module 200 of FIG. 3, the first liquid crystal panel 210 uses bottom emission of the transparent OLED as a light source, and the second liquid crystal panel 230 emits upper light of the transparent OLED. (top emission) is used as a light source.

The anode 221 is connected to a driving circuit unit (not shown) to receive positive power and to provide holes to the hole transport layer 223. This anode 221 is made of indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide, gold, platinum, aluminum or other suitable materials such as electrically conductive carbon, polyaniline, polypyrrole Alternatively formed from π-conjugated polymers such as the like. And they have a work function of at least about 4 eV, more specifically, from about 4 eV to about 6 eV. Among them, it is particularly preferable to use ITO or IZO, which is a large and transparent work function, as the positive electrode material.

The cathode 229 is connected to a driving circuit (not shown) to receive (−) power and to provide electrons to the electron transport layer 229. These cathodes 229 include alkali metals such as lithium or sodium, group 2A or alkaline earth metals such as beryllium, magnesium, calcium, or barium, and rare earths such as scandium, yttrium, lanthanum, cerium, europium, terbium, or actinium It may alternatively be formed from Group III metals, including metals and actinide group metals. Among these, it is particularly preferable to use metals such as calcium and magnesium having a small work function as the negative electrode material.

In addition, by forming the thickness of the cathode 229 very thin, the cathode can be made transparent. Through this, light generated in the light emitting layer 225 may not be reflected through the cathode 229, but may be directly transmitted.

The hole transport layer 223 serves to transfer holes supplied from the anode 221 to the light emitting layer 225. The hole transport layer 223 may include tertiary aromatic amines such as NPB; N, N'-diphenyl-N, N'-bis (3-methylphenyl) -1,1-biphenyl-4,4'-diamine) (TPD); N, N'-di (naphthalen-1-yl) -N, N'-diphenyl-benzidine) (NPB); N, N'-bis (p-biphenyl) -N, N'-diphenyl benzidine (BP-TPD), including but not limited to.

The electron transport layer 227 serves to transfer electrons supplied from the cathode 229 to the emission layer 225. The electron transport layer 229 may be composed entirely of triazine, or may be composed of triazine mixed with other materials.

The light emitting layer 225 emits light by the energy level lowered by the recombination of holes transferred from the hole transport layer 223 and electrons transferred from the electron transport layer 227. That is, excitons are generated during the recombination of holes and electrons, and the excitons are excited to generate light.

In addition, since the energy and the wavelength of light are inversely related to each other, the light emitting layer 225 emits light of different colors according to the energy band gap of the organic material. In the present embodiment, since the transparent OLED is used as a light source of the backlight unit, the light emitting layer 225 preferably includes organic materials having energy band gaps emitting white wavelengths.

The emission layer 225 includes at least one material capable of emitting white light as a result of recombination of holes and electrons. In this case, the at least one material may be any fluorescent material or phosphorescent material, or both materials or any one having different electron and hole transporting capacities.

The first lower polarizer 240 is used not only as the lower polarizer of the first liquid crystal panel 210 but also as a support substrate for growing and supporting the transparent OLED. The second lower polarizer 260 is used not only as the lower polarizer of the second liquid crystal panel 230 but also as an encapsulation substrate for protecting the transparent OLED. Therefore, since the transparent OLED according to the embodiment of the present invention does not require a separate support substrate and an encapsulation substrate, the overall thickness of the backlight unit and the liquid crystal display module can be reduced.

Meanwhile, in the present exemplary embodiment, the polarizer is used as the supporting substrate and the encapsulation substrate of the transparent OLED, but the exemplary embodiment is not limited thereto. For example, as shown in FIG. 5, glass other than the polarizing plate may be used as the supporting substrate and the encapsulation substrate of the transparent OLED. In addition, the substrate may be formed of polymer components including polyesters such as MYLAR®, polycarbonates, polyacrylates, polymethacrylates, polysulfones, quartz, and the like.

The seal pattern 245 is formed at an edge between the first lower polarizer 240 and the second lower polarizer 260, and thus the air gap 255 is formed between the backlight unit 220 and the second liquid crystal panel 230. Is formed.

The seal pattern 245 may be generally made of a sealant made of an organic or polymer material, or may be made of a sealant in which a viscous solvent and metal particles are mixed. The seal pattern 245 is bonded between the first lower polarizer 240 and the second lower polarizer 260 to prevent contamination of external sources such as moisture or gas from penetrating into the transparent OLED.

4 is an enlarged cross-sectional view of a backlight unit according to another exemplary embodiment of the present disclosure. In the following embodiments, description overlapping with the backlight unit of FIG. 3 will be omitted, and description will be made focusing on the difference.

Referring to FIG. 4, the backlight unit 320 according to another embodiment of the present invention may be formed of a transparent OLED generating surface light sources in both directions, and may be integrally formed on the rear surface of the second lower polarizer 231. .

That is, the backlight unit 220 of FIG. 3 is located on the rear surface of the first lower polarizer 240, while the backlight unit 320 of FIG. 4 is located on the rear surface of the second lower polarizer 260. Therefore, the backlight unit according to the present invention may be positioned on either the first lower polarizer 240 or the second lower polarizer 260.

In addition, unlike the backlight unit 220 of FIG. 3, the first lower polarizer 240 is used as an encapsulation substrate for protecting the transparent OLED, and the second lower polarizer 260 is a support substrate for growing the transparent OLED. Can also be used as. Therefore, the transparent OLED according to another embodiment of the present invention also does not require a separate support substrate and an encapsulation substrate, thereby reducing the overall thickness of the backlight unit and the liquid crystal display module.

In addition, unlike the backlight unit 220 of FIG. 3, the first liquid crystal panel 210 uses the top emission of the transparent OLED as a light source, and the second liquid crystal panel 230 emits the lower light of the transparent OLED. (bottom emission) is used as a light source.

As described above, the backlight unit according to the embodiments of the present invention does not require the use of the light guide plate, the diffusion sheet, and the optical sheet, and thus may implement a thin liquid crystal display module. In addition, by using the transparent OLED as a surface light source, the backlight unit can save power consumption and improve visibility compared to a conventional LED light source.

On the other hand, since the liquid crystal display module for a double-sided display according to an embodiment of the present invention uses a transparent OLED as a backlight unit, when the first liquid crystal panel and the second liquid crystal panel of the liquid crystal display module is composed of a transparent panel, A transparent display device using a liquid crystal display module can be implemented. Such a transparent display device is usually in a transparent state, such as glass, and may provide an image for transmitting information, such as a monitor or a TV, if necessary.

Hereinafter, the display device using the liquid crystal display module for a double-sided display according to an embodiment of the present invention will be described with reference to the drawings.

6 illustrates a refrigerator including a liquid crystal display module for a double-sided display according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the refrigerator 600 may mount the display device 610 in one area of the front part. In the present embodiment, the display device 610 will be described with an example of being installed in the center of one door.

The display device 610 includes a liquid crystal display module for a double-sided display using a transparent OLED. That is, the liquid crystal display module for a double-sided display uses a transparent OLED as a backlight unit and configures the first liquid crystal panel and the second liquid crystal panel as a transparent panel. In this case, as the support substrate and the encapsulation substrate of the transparent OLED, it is preferable to use a glass material having a higher transparency than the polarizing plate.

The display device 610 operates in the transparent mode or the display mode according to the manipulation of the user input unit 620. In addition, the operation mode may vary according to a condition preset by a user.

As illustrated in FIG. 6A, when the operation mode is the transparent mode, the display apparatus 610 may maintain a transparent state as glass, as power is not applied to the liquid crystal display module. Therefore, the user can check the contents of the refrigerator 600 through the display device 610 without opening the door of the refrigerator.

As illustrated in FIG. 6B, when the operation mode is a display mode, the display apparatus 610 may display an image on a screen as power is applied to the liquid crystal display module. In this case, the display device 610 may display multimedia functions such as music and / or movie playback, TV viewing, and Internet access according to the manipulation of the user input unit 620. Therefore, while the user prepares food in the kitchen, the user may search the Internet or watch music, a movie, or a TV through the display device 610.

7 illustrates a show case apparatus including a liquid crystal display module for a double-sided display according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the show case apparatus 700 may configure the glass on the front surface of the transparent display apparatus 710. In this case, the display device 710 includes a liquid crystal display module for a double-sided display using a transparent OLED according to an embodiment of the present invention.

 The show case apparatus 700 may display the article 720 displayed through the transparent display apparatus 710. In addition, the show case apparatus 700 may display detailed information about the displayed goods 720 through the display apparatus 710. Therefore, the user may view the displayed items 720 and at the same time, check detailed information about the corresponding items through the display device 710.

For example, as illustrated in FIG. 7, the user may view glasses 720 displayed in the show case apparatus 700 and simultaneously check a detailed image 730 of the glasses in three dimensions.

8 illustrates a vehicle display apparatus having a liquid crystal display module for a double-sided display according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the vehicle display apparatus 810 is formed in one region of a vehicle windshield. In this case, the vehicle display apparatus 810 includes a liquid crystal display module for a double-sided display using a transparent OLED according to an embodiment of the present invention.

The vehicle display apparatus 810 operates in a transparent mode or a display mode according to an operation of a user input unit (not shown). In addition, the operation mode may vary according to a condition preset by a user.

When the vehicle display apparatus 810 operates in the transparent mode, the display apparatus 810 maintains a transparent state since power is not applied to the liquid crystal display module. Thus, the driver runs through the windshield, which is entirely transparent, as is the case with a conventional automobile glass.

When the vehicle display apparatus 810 operates in the display mode, the display apparatus 810 may display an image on a screen as power is applied to the liquid crystal display module. In this case, the display device 810 may display a navigation screen for guiding a road. Therefore, the driver can drive while viewing the navigation screen displayed on the front windshield of the vehicle.

Meanwhile, in the present exemplary embodiment, the display apparatus 810 displays the navigation screen, but the present invention is not limited thereto. That is, the display device 810 may display not only a navigation screen but also various multimedia functions such as a music playback screen, a movie, and a TV viewing screen. Therefore, people who ride by the driver can move while watching the multimedia screen displayed on the front windshield of the car.

9 illustrates a mobile terminal having a liquid crystal display module for a double-sided display according to an embodiment of the present invention.

Referring to FIG. 9, the mobile terminal 900 includes a two-sided display device that displays two different screens. That is, the double-sided display device includes a first display unit 910 installed at the front of the main body and a second display unit 920 installed at the rear of the main body.

The double-sided display devices 910 and 920 include a liquid crystal display module for a double-sided display using a transparent OLED according to an embodiment of the present invention. Accordingly, the first display unit 910 of the double-sided display device is configured by the first liquid crystal panel and the transparent OLED, and the second display unit 920 of the double-sided display device is configured by the second liquid crystal panel and the transparent OLED. The transparent OLED is used as a light source of a common backlight unit of the first display unit 910 and the second display unit 920. Meanwhile, when the first liquid crystal panel and the second liquid crystal panel are configured as transparent panels, the mobile terminal may implement the double-sided display device as a transparent display device.

The first display unit 910 may display a first screen related to the first operation of the mobile terminal, and the second display unit 920 may display a second screen related to the second operation of the mobile terminal. Therefore, the user may perform multitasking through the duplex display device.

While the above has been shown and described with respect to preferred embodiments of the invention, the invention is not limited to the specific embodiments described above, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

200: liquid crystal display module 210: first liquid crystal panel
220: backlight unit 230: second liquid crystal panel
240: seal pattern 250: air gap

Claims (13)

A first liquid crystal panel and a second liquid crystal panel spaced apart from each other at regular intervals;
A first upper substrate formed on a front surface of the first liquid crystal panel and a first lower substrate formed on a rear surface of the first liquid crystal panel;
A second upper substrate formed on the front surface of the second liquid crystal panel and a second lower substrate formed on the rear surface of the second liquid crystal panel;
An organic light emitting device integrally formed on a rear surface of the first lower substrate or the second lower substrate; And
And a seal pattern formed along an edge between the first lower substrate and the second lower substrate. The method of claim 1,
And the first and second lower substrates and the first and second upper substrates are made of polarizing plates. The method of claim 1,
And the first and second lower substrates and the first and second upper substrates are made of glass. The method of claim 1,
The organic light emitting diode is a liquid crystal display module for a two-sided display, characterized in that the transparent organic light emitting device. The method of claim 1,
And an air gap surrounded by the first lower substrate, the second lower substrate, and the seal pattern. The method of claim 1,
Each of the first and second liquid crystal panels includes a TFT (Thin Film Transistor) array substrate, a color filter substrate, and a liquid crystal layer between the two substrates. The method of claim 1,
When the organic light emitting device is formed on the rear surface of the first lower substrate,
The organic light emitting diode may include an anode, a hole transport layer, an emission layer, an electron transport layer, and a cathode sequentially stacked from a rear surface of the first lower substrate. LCD module for display. The method of claim 1,
When the organic light emitting device is formed on the rear surface of the second lower substrate,
The organic light emitting diode may include an anode, a hole transport layer, an emission layer, an electron transport layer, and a cathode sequentially stacked from the rear surface of the second lower substrate. LCD module for display. The method of claim 1,
When the organic light emitting device is formed on the rear surface of the first lower substrate,
And the first lower substrate is used as a support substrate of the organic light emitting diode, and the second lower substrate is used as an encapsulation substrate of the organic light emitting diode. The method of claim 1,
When the organic light emitting device is formed on the rear surface of the second lower substrate,
And the second lower substrate is used as a support substrate of the organic light emitting diode, and the first lower substrate is used as an encapsulation substrate of the organic light emitting diode. The method of claim 1,
The seal pattern is made of a sealant made of an organic or polymer material, or a liquid crystal display module for a double-sided display, characterized in that the sealant made of a mixture of a viscous solvent and metal particles. The method of claim 1,
The organic light emitting diode is a liquid crystal display module for a two-sided display, characterized in that for generating a white wavelength. The method of claim 1,
The organic light emitting device is a liquid crystal display module for a two-sided display, characterized in that for generating a surface light source.

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