KR100975750B1 - Dual liquid crystal display using of dual front light - Google Patents

Abstract

The present invention discloses a dual liquid crystal display using dual front lights. A dual liquid crystal display using a dual front light according to the present invention includes a liquid crystal panel formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; It comprises a micro-reflective scattering film attached between the first polarizing plate and the first front light.

Dual liquid crystal display using the dual front light according to the present invention, by providing a micro-reflective scattering film to improve the light efficiency by displaying using the external light in a bright external environment, and prevents the moire phenomenon by the dual front light to be clear Image quality can be realized.

Front light, liquid crystal panel, microreflective scattering film

Description

Dual liquid crystal display using dual front lights {DUAL LIQUID CRYSTAL DISPLAY USING OF DUAL FRONT LIGHT}

1 is a view schematically illustrating a structure of a front light unit of a reflective liquid crystal display device according to the related art.

2 is a cross-sectional view of FIG.

FIG. 3 schematically illustrates the structure of a first embodiment of a dual liquid crystal display using dual front lights according to the present invention; FIG.

4 schematically illustrates what is displayed when the first front light according to the invention is in an on state;

FIG. 5 shows schematically what is displayed when the second front light according to the invention is in an on state;

FIG. 6 schematically illustrates the structure of a second embodiment of a dual liquid crystal display using dual front lights according to the present invention; FIG.

FIG. 7 schematically illustrates the structure of a third embodiment of a dual liquid crystal display using dual front lights according to the present invention; FIG.

FIG. 8 schematically illustrates the structure of a fourth embodiment of a dual liquid crystal display using dual front lights according to the present invention; FIG.                 

FIG. 9 schematically illustrates a structure of a fifth embodiment of a dual liquid crystal display using dual front lights according to the present invention; FIG.

FIG. 10 schematically illustrates a structure of a sixth embodiment of a dual liquid crystal display using dual front lights according to the present invention; FIG.

FIG. 11 schematically illustrates a structure of a seventh embodiment of a dual liquid crystal display using dual front lights according to the present invention; FIG.

FIG. 12 schematically illustrates a structure of an eighth embodiment of a dual liquid crystal display using dual front lights according to the present invention; FIG.

13 is a view showing an example in which a dual liquid crystal display using a dual front light according to the present invention is applied.

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

301, 601, 701, 801, 901, 1001, 1101, 1201 --- liquid crystal panel

302, 602, 702, 802, 901, 1001, 1101, 1202 --- first front light

303, 603, 703, 803, 901, 1001, 1101, 1203 --- 2nd front light

304, 604, 704, 804, 901, 1001, 1101, 1204 --- first polarizer

305, 605, 705, 805, 901, 1001, 1101, 1205 --- Second polarizer

306, 606, 906, 1006 --- microreflective scattering film

706, 1106 --- First microreflective scattering film

707, 1107 --- Second microreflective scattering film

806, 1206 --- First Scattering Film                 

807, 1207 --- Second Scattering Film

907, 1007, 1108, 1208 --- Partial Reflector

The present invention relates to a dual liquid crystal display device using a dual front light, and in particular, by providing a micro-reflective scattering film in the dual liquid crystal display device using a dual front light to improve the light efficiency by displaying using external light in a bright external environment. The present invention relates to a dual liquid crystal display using dual front lights capable of realizing clear image quality by preventing moiré phenomenon caused by dual front lights.

In general, the liquid crystal display is a flat panel display having advantages of small size, thinness, and low power consumption, and is used as a portable computer such as a notebook PC, office automation equipment, and audio / video equipment.

Such a liquid crystal display device displays an image or an image by controlling an electric field applied to a liquid crystal material having dielectric anisotropy to transmit or block light. Liquid crystal display devices, unlike display elements that emit light by themselves, such as electro-luminescence (EL), cathode ray tube (CRT), and light emitting diode (LED), emit light by themselves. It does not occur and uses external light.

In general, liquid crystal displays are roughly classified into a transmission type and a reflection type according to a method of using light. The transmissive liquid crystal display device includes a liquid crystal display panel in which a liquid crystal material is injected between two glass substrates, and a backlight for supplying light to the liquid crystal display panel.

However, the transmissive liquid crystal display device has difficulty in thinning and weighting due to the volume and weight of the backlight, and has been pointed out as an excessive power consumption of the backlight. In response to this trend, research and development of a reflective liquid crystal display device that does not use a backlight have been recently conducted.

Since the reflective liquid crystal display device does not have its own light source, it displays an image depending on natural light (or ambient light). Therefore, since a separate backlight is not required, power consumption is low, so it is widely used as a portable display device such as an electronic notebook or personal information terminal.

However, the reflection type liquid crystal display device has a problem in that when the natural light does not have a sufficient amount of light (for example, when the surroundings are dark), the luminance level of the display image is lowered and the displayed information cannot be read. In order to solve this problem, a front light unit (FLU), which is separately installed in the reflective LCD and supplies light beams to the reflective liquid crystal display when the ambient light is dark, is used.

1 is a view schematically illustrating a structure of a front light unit of a reflective liquid crystal display according to the related art, and FIG. 2 is a cross-sectional view of FIG. 1. 1 and 2, the reflective liquid crystal display device includes a reflective liquid crystal panel 101 and a front light positioned above the reflective liquid crystal panel 101 to supply light beams to the reflective liquid crystal panel 101. Unit 102. The reflective liquid crystal panel (Diffusing reflective electrode) of the lower portion of FIG. 2 is formed in the reflective liquid crystal panel 101 to reflect natural light (or auxiliary light) incident on the display surface of the liquid crystal panel 101.

The front light unit 102 includes a light source 201 for generating a light beam, a light guide plate 202 for uniformly emitting the light beam toward the display surface of the liquid crystal panel, and a light source 201 in the light source 201. The reflector 203 reflects the generated light beam toward the light guide plate 202, and the reflector 204 prevents the light beam from leaking from the light guide plate 202.

In this case, since the upper surface of the light guide plate 202 has a prism pattern, the traveling path of light incident obliquely to the light guide plate 202 is changed perpendicular to the display surface.

Therefore, the light incident on the light guide plate 202 is incident in the vertical direction of the reflective liquid crystal panel 101 positioned below the light guide plate 202. Light vertically incident on the reflective liquid crystal panel 101 is reflected by the reflective liquid crystal panel 101 and proceeds upwards of the light guide plate 202.

The present invention provides a dual reflection light scattering film in a dual liquid crystal display device using dual front lights, so that light efficiency can be improved by displaying using external light in a bright external environment, thereby preventing moire phenomenon caused by dual front lights. An object of the present invention is to provide a dual liquid crystal display using dual front lights capable of realizing clear image quality.

In order to achieve the above object, the dual liquid crystal display using the dual front light according to the present invention,

A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate;

First and second polarizers attached to both surfaces of the liquid crystal panel, respectively;

A first front light attached to a front portion of the liquid crystal panel;

A second front light attached to a rear portion of the liquid crystal panel;

A fine reflection scattering film attached between the first polarizing plate and the first front light;

It is characterized in that it comprises a partial reflector attached to the front surface of the first front light.

In addition, a dual liquid crystal display using a dual front light according to the present invention to achieve the above object,

A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate;

First and second polarizers attached to both surfaces of the liquid crystal panel, respectively;

A first front light attached to a front portion of the liquid crystal panel;

A second front light attached to a rear portion of the liquid crystal panel;

A fine reflection scattering film attached between the second polarizing plate and the second front light;

Its feature is that it includes a partial reflector attached to the front face of the first front light.

In addition, a dual liquid crystal display using a dual front light according to the present invention to achieve the above object,

A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate;

First and second polarizers attached to both surfaces of the liquid crystal panel, respectively;

A first front light attached to a front portion of the liquid crystal panel;

A second front light attached to a rear portion of the liquid crystal panel;

A first microreflective scattering film attached between the first polarizing plate and the first front light;

A second microreflective scattering film attached between the second polarizing plate and the second front light;

It is characterized in that it comprises a partial reflector attached to the front surface of the first front light.

In addition, a dual liquid crystal display using a dual front light according to the present invention to achieve the above object,

A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate;

First and second polarizers attached to both surfaces of the liquid crystal panel, respectively;

A first front light attached to a front portion of the liquid crystal panel;

A second front light attached to a rear portion of the liquid crystal panel;

A first scattering film attached between the first polarizing plate and the first front light;                     

A second scattering film attached between the second polarizing plate and the second front light;

It is characterized in that it comprises a partial reflector attached to the front surface of the first front light.

According to the present invention, by providing a micro-reflective scattering film in a dual liquid crystal display device using a dual front light, the light efficiency can be improved by using the external light in a bright outside environment, the moire phenomenon by the dual front light It is possible to realize a clear picture quality by preventing the error.

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

3 is a diagram schematically illustrating a structure of a first exemplary embodiment of a dual liquid crystal display using dual front lights according to the present invention. As shown in the drawing, the dual liquid crystal display using the dual front lights includes a liquid crystal panel 301 formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizers 304 and 305 attached to both surfaces of the liquid crystal panel 301, respectively; A first front light (302) attached to the front portion of the liquid crystal panel (301); A second front light 303 attached to a rear portion of the liquid crystal panel 301; It comprises a micro-reflective scattering film 306 attached between the first polarizing plate and the first front light.

The liquid crystal panel 301 is a transmissive type, and a first substrate (thin film transistor substrate) and a second substrate (color filter substrate) are provided to face each other at a predetermined interval.

In more detail with respect to the liquid crystal panel 301, a gate bus line and a data bus line are formed on the inner surface of one transparent substrate in a matrix form on a first substrate (thin film transistor substrate).

Thin film transistors (TFTs), which function as switching elements, are formed at intersections of the gate bus lines and the data bus lines, and square pixel electrodes contacting the drain electrodes of the TFTs are surrounded by the gate bus lines and the data bus lines. It is formed in the form of each.

Here, a thin film transistor (TFT) formed on the lower plate of the liquid crystal panel 301 is amorphous containing hydrogen without periodicity of lattice according to the crystal state of a semiconductor layer which is an active layer among the constituent elements. An amorphous thin film transistor (amorphous TFT) using a silicon (amorphous silicon) is applied or a polysilicon thin film transistor (poly silicon TFT) using a polycrystalline solid (polycrystalline silicon) is applied.

The second substrate (color filter substrate) facing the transparent substrate on which the plurality of pixel electrodes is formed has a BM (Black Matrix: BM), a color filter layer, and a common electrode formed on an inner surface of the transparent substrate.

When one gate bus line and one data bus line of the liquid crystal panel configured as described above are selected and a voltage is applied, only a TFT (Thin Film Transistor (TFT)) to which the voltage is applied is turned on, and the on TFT is turned on. Charges are accumulated in the pixel electrode connected to the drain electrode of to change the angle of the liquid crystal molecules between the common electrode and the common electrode.

Therefore, an electric field applied to liquid crystal molecules having dielectric anisotropy is transmitted to block or transmit light to display an image or an image. Herein, the liquid crystal is TN (Twist Nematic) mode.

In addition, first and second polarizing plates 304 and 305 and a compensation plate (not shown) are further provided on both surfaces of the liquid crystal panel 301. Here, the first and second polarizing plates 304 and 305 are attached to both surfaces of the liquid crystal panel 301 by 90 °.

The first and second polarizers 304 and 305 only transmit light that vibrates in one direction to polarize natural light.

The compensation plate (not shown) is to solve the viewing angle problem by compensating the phase change of the light in the liquid crystal molecules in the opposite direction, the compensation plate (not shown) is uniaxial (uniaxial) or biaxial (biaxial) Used.

Meanwhile, in the first front light 302 provided on the front surface of the liquid crystal panel 301, when light is emitted from the light source, the light is incident on the light guide plate to change the linear light source into a uniform surface light source.

In this case, since the upper surface of the light guide plate has a prism pattern, the traveling path of light incident obliquely to the light guide plate is changed perpendicular to the display surface.

The light changed from the light guide plate to the surface light source is scattered by the diffuser plate and passes through the liquid crystal cell.

The microreflective scattering film 306 reflects external light at the same time when the transmitted light by the first front light 302 is displayed on the rear portion of the liquid crystal panel.

In more detail, when the transmissive liquid crystal panel is displayed in a place where the external light is bright, the brightness of the light by the first front light 302 is relatively lower than the brightness of the external light to view the screen displayed on the rear side of the liquid crystal panel. Is difficult.

Therefore, when the external light is bright by applying a microreflective scattering film between the first polarizing plate 304 and the first front light 302, the external light is reflected by the microreflective scattering film 306 to improve light efficiency. This is enhanced to view the screen displayed on the rear portion of the liquid crystal panel 301.

In addition, the micro-reflective scattering film 306 eliminates the occurrence of a moire phenomenon in which stripes appear on a screen displayed by a predetermined rule pattern of the light guide plate portion of the front light.

Here, the moire phenomenon refers to an interference fringe formed when two or more periodic patterns overlap, and overlap two or more similarly spaced grids to shine light. This is a stripe with a large period separate from the two grids.

4 is a diagram schematically illustrating the display when the first front light 302 according to the present invention is in an on state. As shown in the drawing, when the liquid crystal panel 301 is in the normally white mode, the first front light 302 is turned on. The path of light in a state where no voltage is applied to the liquid crystal panel 301 is that the light passing through the first polarizing plate 304 provided on one surface of the liquid crystal panel 301 is twisted along the array of liquid crystal molecules. Passing through the second polarizing plate 305 provided 90 degrees to the other side of the intersection.

That is, in the state where no voltage is applied as described above, light passes and is implemented as white.

However, in the state where the voltage is applied to the liquid crystal panel 301, the liquid crystal molecules rise along the direction of the electric field and transmit the light passing through the first polarizing plate 304 to the crossed second polarizing plate 305 as it is. Is blocked by the polarizer. In other words, when the voltage is applied, the light is blocked and implemented in black.

Therefore, by selectively applying the voltage to adjust the light passing through the liquid crystal panel 301 to display a desired screen on the rear of the liquid crystal panel 301.

At this time, when the external light is bright, when the screen displayed on the rear portion of the liquid crystal panel 301 is viewed, the visibility and the vivid screen are provided by the external light reflected by the microreflective scattering film 306. .

5 is a diagram schematically showing what is displayed when the second front light according to the present invention is turned on. As shown in FIG. 2, when the liquid crystal panel 301 is in the normally white mode, the second front light 303 is on and light is not applied to the liquid crystal panel 301. The path of the first polarizing plate 304 provided with light passing through the second polarizing plate 305 provided on one surface of the liquid crystal panel 301 is twisted along the array of liquid crystal molecules 90 degrees to the other surface of the liquid crystal panel. Will pass).

That is, in the state where no voltage is applied as described above, light passes and is implemented as white.

However, in the state where the voltage is applied to the liquid crystal panel 301, the liquid crystal molecules rise along the direction of the electric field and transmit the light passing through the second polarizing plate 305 to the crossed first polarizing plate 304 as it is. Blocked by the polarizer. In other words, when the voltage is applied, the light is blocked and implemented in black.

Therefore, by selectively applying the voltage to adjust the light passing through the liquid crystal panel 301 to display a desired screen on the front of the liquid crystal panel.

As mentioned above, the front or rear surface of the liquid crystal panel 301 is displayed depending on whether the first front light 302 or the second front light 303 is turned on.

6 is a diagram schematically illustrating a structure of a second embodiment of a dual liquid crystal display using dual front lights according to the present invention. As shown in the drawing, the dual liquid crystal display using the dual front lights includes: a liquid crystal panel 601 formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizing plates 604 and 605 attached to both surfaces of the liquid crystal panel 601, respectively; A first front light 602 attached to the front portion of the liquid crystal panel 601; A second front light 603 attached to a rear portion of the liquid crystal panel 601; It comprises a micro-reflective scattering film 606 attached between the second polarizing plate 605 and the second front light (603).

The microreflective scattering film 606 is provided between the second polarizer 605 and the second front light 603, and reflects the external light from the microreflective scattering film 603 when the external light is bright. As a result, the light efficiency is improved, and the moiré phenomenon is removed to view the screen displayed on the front of the liquid crystal panel 601.

Here, a detailed description of the second embodiment of the present invention will be omitted with reference to the above-described first embodiment of FIG. 4 and FIG. 5.

FIG. 7 is a diagram schematically illustrating a structure of a third exemplary embodiment of a dual liquid crystal display using dual front lights according to the present invention. As shown in the drawing, the dual liquid crystal display using the dual front lights includes: a liquid crystal panel 701 formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizing plates 704 and 705 attached to both surfaces of the liquid crystal panel 701, respectively; A first front light 702 attached to the front portion of the liquid crystal panel 701; A second front light 703 attached to a rear portion of the liquid crystal panel 701; A first microreflective scattering film 706 attached between the first polarizing plate 704 and the first front light 702; And a second microreflective scattering film 707 attached between the second polarizing plate 705 and the second front light 703.

The first microreflective scattering film 706 is provided between the first polarizing plate 704 and the first front light 702, and when the external light is bright, the external light is the first microreflective scattering film ( By reflecting from the light 706 to improve the light efficiency, and remove the moiré phenomenon it is possible to see a clear screen displayed on the rear portion of the liquid crystal panel 701.

The second microreflective scattering film 707 is provided between the second polarizing plate 705 and the second front light 703, and the external light is the second microreflective scattering when the external light is bright. By reflecting from the film 707 to improve the light efficiency, and remove the moiré phenomenon it is possible to see a clear screen displayed on the front portion of the liquid crystal panel 701.

Therefore, the first and second microreflective scattering films 706 and 707 are respectively provided to ensure visibility of the screen displayed on both surfaces of the liquid crystal panel 701.

Here, the detailed description of the third embodiment of the present invention will be omitted with reference to the above-described first embodiment of FIGS. 4 and 5.

8 is a diagram schematically illustrating a structure of a fourth exemplary embodiment of a dual liquid crystal display using dual front lights according to the present invention. As shown in the drawing, the dual liquid crystal display using the dual front lights includes: a liquid crystal panel 801 formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizing plates 804 and 805 attached to both surfaces of the liquid crystal panel 801, respectively; A first front light (802) attached to the front portion of the liquid crystal panel (801); A second front light (803) attached to a rear portion of the liquid crystal panel (801); A first scattering film 806 attached between the first polarizing plate 804 and the first front light 802; And a second scattering film 807 attached between the second polarizing plate 805 and the second front light 803.

The first scattering film 806 is provided between the first polarizing plate 804 and the first front light 802 to be streaked on the screen by a pattern of a predetermined rule of the light guide plate portion of the first front light 802. By removing the moire phenomenon that appears, the clear screen displayed on the rear portion of the liquid crystal panel 801 can be seen.

Here, the moire phenomenon refers to an interference fringe formed when two or more periodic patterns overlap, and overlap two or more similarly spaced grids to shine light. This is a stripe with a large period separate from the two grids.

In addition, the second scattering film 807 is provided between the second polarizing plate 805 and the second front light 803 and is formed on the screen by a predetermined rule pattern of the light guide plate portion of the second front light 803. By eliminating the moiré phenomenon in which streaks appear, the clear screen displayed on the front surface of the liquid crystal panel 801 can be seen.

Therefore, the first and second scattering films 806 and 807 are provided, respectively, to improve the sharpness of the image quality displayed on both surfaces of the liquid crystal panel 801.

Here, the detailed description of the fourth embodiment of the present invention will be omitted with reference to the above-described first embodiment of FIGS. 4 and 5.

9 is a diagram schematically illustrating a structure of a fifth embodiment of a dual liquid crystal display using dual front lights according to the present invention. As shown in the drawing, a dual liquid crystal display using a dual front light includes: a liquid crystal panel 901 formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizers 904 and 905 attached to both surfaces of the liquid crystal panel 901, respectively; A first front light (902) attached to a front portion of the liquid crystal panel (901); A second front light 903 attached to a rear portion of the liquid crystal panel 901; A fine reflection scattering film 906 attached between the first polarizing plate 904 and the first front light 902; And a partial reflector 907 attached to the front surface of the first front light 902.

Here, a detailed description of the fifth embodiment of the present invention will be omitted with reference to the aforementioned first embodiment of FIGS. 4 and 5.

The partial reflector 907 serves as a mirror function in front of the liquid crystal panel 901 when the first front light 902 and the second front light 902 of the liquid crystal panel 901 are turned off. It is done.

In more detail, the partial reflector 907 generally means a metal material of about 50 to 90% having a reflectance of less than 100% or a dual brightness enhancement film (DBEF).

Meanwhile, instead of the partial reflector, a partial reflector whose reflectance varies depending on the application of voltage may be used. In this case, the partial reflector whose reflectance is different is composed of a cholesteric liquid crystal layer and a λ / 4 plate.

FIG. 10 is a diagram schematically illustrating a structure of a sixth embodiment of a dual liquid crystal display using dual front lights according to the present invention. As shown in the drawing, a dual liquid crystal display using a dual front light includes: a liquid crystal panel 1001 formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizing plates 1004 and 1005 attached to both surfaces of the liquid crystal panel 1001; A first front light (1002) attached to the front portion of the liquid crystal panel (1001); A second front light (1003) attached to a rear portion of the liquid crystal panel (1001); A fine reflection scattering film 1006 attached between the second polarizing plate 1005 and the second front light 1003; And a partial reflecting plate 1007 attached to the front surface of the first front light 1002.

Here, the detailed description of the sixth embodiment of the present invention will be omitted with reference to the above-described first embodiment of FIGS. 4 and 5 and the fifth embodiment of FIG. 9.

The partial reflector 1007 is used as a mirror function in front of the liquid crystal panel 1001 when the first front light 1002 and the second front light 1002 of the liquid crystal panel 1001 are in an off state. It is done.

11 is a diagram schematically illustrating a structure of a seventh embodiment of a dual liquid crystal display using dual front lights according to the present invention. As shown in the drawing, the dual liquid crystal display device using the dual front lights includes: a liquid crystal panel 1101 formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizing plates 1104 and 1105 attached to both surfaces of the liquid crystal panel 1101; A first front light 1102 attached to a front portion of the liquid crystal panel 1101; A second front light 1103 attached to a rear portion of the liquid crystal panel 1101; A first microreflective scattering film 1106 attached between the first polarizing plate 1104 and the first front light 1102; A second microreflective scattering film 1107 attached between the second polarizing plate 1105 and the second front light 1103; And a partial reflector 1108 attached to the front surface of the first front light 1102.

Here, the detailed description of the seventh embodiment of the present invention will be omitted with reference to the above-described first embodiment of FIGS. 4 and 5 and the fifth embodiment of FIG. 9.

The partial reflector 1108 serves as a mirror function in front of the liquid crystal panel 1101 when the first front light 1102 and the second front light 1102 of the liquid crystal panel 1101 are off. It is done.

FIG. 12 is a diagram schematically illustrating a structure of an eighth embodiment of a dual liquid crystal display using dual front lights according to the present invention. As shown therein, the dual liquid crystal display using the dual front lights includes: a liquid crystal panel 1201 formed by injecting liquid crystal between an upper plate and a lower plate; First and second polarizing plates 1204 and 1205 attached to both surfaces of the liquid crystal panel 1201; A first front light (1202) attached to the front portion of the liquid crystal panel (1201); A second front light 1203 attached to a rear portion of the liquid crystal panel 1201; A first scattering film 1206 attached between the first polarizing plate 1204 and the first front light 1202; A second scattering film 1207 attached between the second polarizing plate 1205 and the second front light 1203; And a partial reflector plate 1208 attached to the front surface of the first front light 1202.

Here, the detailed description of the eighth embodiment of the present invention will be omitted with reference to the above-described first embodiment of FIGS. 4 and 5 and the fifth embodiment of FIG. 9.

The partial reflector 1208 is used as a mirror function in front of the liquid crystal panel 1201 when the first front light 1202 and the second front light 1202 of the liquid crystal panel 1201 are turned off. It is done.

13 is a diagram illustrating an example in which a dual liquid crystal display using dual front lights according to the present invention is applied. As shown in the figure, when applied to a dual mobile phone is possible to implement a lightweight thin dual mobile phone because the display on the front and rear of the liquid crystal panel.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the dual liquid crystal display using the dual front light according to the present invention is provided with a microreflective scattering film in the dual liquid crystal display using the dual front light, so that the display is made by using external light in a bright environment. The light efficiency can be improved and the picture quality can be realized by preventing the moiré phenomenon caused by the dual front lights.

In addition, a partial reflector may be used as a mirror function in front of the liquid crystal panel in a state where the dual front light is not powered.

In addition, it is possible to reduce the power consumption of the battery because the power consumption of the front light source can be reduced when using the external light applied to the mobile.

Claims (27)

A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; And a micro-reflective scattering film attached between the first polarizing plate and the first front light. A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; A fine reflection scattering film attached between the first polarizing plate and the first front light; And a partial reflector attached to a front surface of the first front light. The method according to claim 1 or 2, Dual front lights are displayed on the rear portion of the liquid crystal panel when the first front light is ON, and is displayed on the front portion of the liquid crystal panel when the second front light is ON. Dual liquid crystal display using. The method according to claim 1 or 2, The micro-reflective scattering film is a dual liquid crystal display using a dual front light, characterized in that when the transmitted light by the first front light is displayed on the rear portion of the liquid crystal panel at the same time reflects an external light source. A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; And a micro-reflective scattering film attached between the second polarizing plate and the second front light. A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; A fine reflection scattering film attached between the second polarizing plate and the second front light; And a partial reflector attached to a front surface of the first front light. The method according to claim 5 or 6, The dual front lights may be displayed on the rear part of the liquid crystal panel when the first front light is ON, and displayed on the front parts of the liquid crystal panel when the second front light is ON. Dual liquid crystal display using. The method according to claim 5 or 6, The micro-reflective scattering film is a dual liquid crystal display using a dual front light, characterized in that when the transmitted light by the second front light is displayed on the front portion of the liquid crystal panel at the same time reflects an external light source. The method according to claim 1, 2, 5 or 6, The micro-reflective scattering film is a dual liquid crystal display using a dual front light, characterized in that to eliminate the phenomenon that stripes appear on the liquid crystal panel displayed. A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; A first microreflective scattering film attached between the first polarizing plate and the first front light; And a second micro-reflective scattering film attached between the second polarizing plate and the second front light. A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; A first microreflective scattering film attached between the first polarizing plate and the first front light; A second microreflective scattering film attached between the second polarizing plate and the second front light; And a partial reflector attached to a front surface of the first front light. The method according to claim 10 or 11, wherein The dual front lights may be displayed on the rear part of the liquid crystal panel when the first front light is ON, and displayed on the front parts of the liquid crystal panel when the second front light is ON. Dual liquid crystal display using. The method according to claim 10 or 11, wherein The first microreflective scattering film reflects an external light source at the same time when the transmitted light by the first front light is displayed on the rear side of the liquid crystal panel, and the second microreflective scattering film is transmitted by the second front light. A dual liquid crystal display using dual front lights, characterized by simultaneously reflecting an external light source when displayed on the front of the liquid crystal panel. The method according to claim 10 or 11, wherein The first and second micro-reflective scattering film is a dual liquid crystal display using a dual front light, characterized in that to eliminate the phenomenon that stripes appear on the liquid crystal panel displayed. A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; A first scattering film attached between the first polarizing plate and the first front light; And a second scattering film attached between the second polarizing plate and the second front light. A liquid crystal panel formed by injecting liquid crystal between the upper plate and the lower plate; First and second polarizers attached to both surfaces of the liquid crystal panel, respectively; A first front light attached to a front portion of the liquid crystal panel; A second front light attached to a rear portion of the liquid crystal panel; A first scattering film attached between the first polarizing plate and the first front light; A second scattering film attached between the second polarizing plate and the second front light; And a partial reflector attached to a front surface of the first front light. The method according to claim 15 or 16, The dual front lights are displayed on the rear part of the liquid crystal panel when the first front light is in an ON state, and is displayed on the front parts of the liquid crystal panel when the second front light is in an ON state. Dual liquid crystal display using. The method according to claim 15 or 16, Wherein the first scattering film removes moiré phenomena due to the pattern of the light guide plate portion of the first front light, and the second scattering film removes moiré phenomenon due to the pattern of the light guide plate portion of the second front light. Dual liquid crystal display using dual front lights. The method of claim 15 or 16, And the first and second scattering films eliminate a phenomenon in which streaks appear on the liquid crystal panel to be displayed. The method according to claim 2, 6, 11 or 16, And the partial reflector is used as a mirror function in the front part when the first front light and the second front light are in an OFF state. The method according to claim 2, 6, 11 or 16, The partial reflection plate is a dual liquid crystal display using a dual front light, characterized in that the reflector of the reflectance of about 50 ~ 90%. The method according to claim 2, 6, 11 or 16, And the partial reflector is a dual brightness enhancement film (DBEF) or a metallic material. The method according to claim 1, 2, 5, 6, 10, 11, 15 or 16, The liquid crystal of the liquid crystal panel is a dual liquid crystal display using a dual front light, characterized in that the TN mode. The method according to claim 1, 2, 5, 6, 10, 11, 15 or 16, And the first and second polarizing plates are attached to both surfaces of the liquid crystal panel at 90 ° to each other. The method according to claim 1, 2, 5, 6, 10, 11, 15 or 16, In the lower panel of the liquid crystal panel, TFTs (Thin Film Transistors (TFTs)), which function as switching elements, are formed at the intersections of the gate bus lines and the data bus lines, respectively. Dual LCD using dual front lights, characterized in that. The method according to claim 1, 2, 5, 6, 10, 11, 15 or 16, Thin film transistors (TFTs) formed on the lower plate of the liquid crystal panel are formed of an amorphous thin film transistor (TFT). The method according to claim 1, 2, 5, 6, 10, 11, 15 or 16, Thin film transistors (TFTs) formed on the lower plate of the liquid crystal panel are formed of polysilicon thin film transistors (TFTs).

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