KR20110054459A - Dual-type liquid crystal display module and portable phone having the same - Google Patents

Abstract

PURPOSE: A dual-type liquid crystal display module and a portable phone having the same are provided to prevent the generation of a transcriber mark on a liquid crystal panel and increasing the surface rigidity by forming a diffusion pattern. CONSTITUTION: A dual-type liquid crystal display module of a portable phone comprises a pair of liquid crystal panel and a backlight unit including a light source which is placed in a common light guide plate(210) and one side of the common light guide plate. The backlight unit is placed between the liquid crystal panel and projects light to the pair of the liquid crystal panel. Dispersion patterns(211,212) are formed on both sides of the common light guide plate.

Description

Dual liquid crystal display module and mobile phone terminal having the same {DUAL-TYPE LIQUID CRYSTAL DISPLAY MODULE AND PORTABLE PHONE HAVING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual liquid crystal display module and a mobile phone terminal having the same, and more particularly, to form a strength reinforcement scattering pattern on each side of a common light guide plate to increase surface strength and to enhance the surface strength of the liquid crystal panel by external force. The present invention relates to a dual liquid crystal display module and a mobile phone terminal including the dual liquid crystal display module capable of preventing a transfer mark from occurring.

Recently, the display field has also been rapidly developed in line with the information age, and a flat panel display device (FPD) having the advantages of thinning, light weight, and low power consumption has been developed and applied.

Among these, liquid crystal display devices (LCDs) are used in notebooks, monitors, and TVs because of their excellent contrast ratio and high contrast ratio. Since it does not have an element, a separate light source is required.

As a result, a backlight unit having a lamp is provided on the rear surface to irradiate light toward the front surface of the liquid crystal panel, thereby realizing an image of identifiable luminance.

Meanwhile, a general backlight unit is classified into an edge type and a direct type according to the arrangement of the lamps. The edge type has a structure in which the lamp is disposed on one side or both sides of the light guide plate, and the direct type has a plurality of types. The lamp has a structure disposed below the optical sheet.

In general, a liquid crystal display module for realizing an image in one liquid crystal panel includes a liquid crystal panel, a backlight unit disposed behind the liquid crystal panel, and a mold frame supporting the liquid crystal panel.

The backlight unit includes a light guide plate, a light source provided at one side of the light guide plate to emit light, a diffusion sheet disposed above the light guide plate, and a light emitted from the light source and not projected onto the diffusion sheet to be reprojected onto the diffusion sheet. It is composed of a reflective sheet and the like disposed below the light guide plate.

An optical sheet for condensing light is disposed above the diffusion sheet.

Here, a scattering pattern for scattering light is formed on the upper surface of the light guide plate facing the diffusion sheet, but no scattering pattern is formed on the lower surface.

That is, since the scattering pattern is not formed on the lower surface of the light guide plate, the surface is relatively inferior to the upper surface thereof, and the surface strength is inferior.

Recently, a dual liquid crystal display module having a dual liquid crystal panel has been developed and applied. An example of such a module is a structure in which the above-described diffusion sheets, liquid crystal panels, etc. are sequentially disposed on both sides of one light guide plate. Have Here, the liquid crystal panel is composed of a main display panel and a sub display panel.

That is, as described above, when a scattering pattern is formed only on one surface and the light guide plate on which the scattering pattern is not formed is applied to the other surface, a dual liquid crystal display module is developed. , A light guide plate, a diffusion sheet, and a sub display panel are sequentially arranged.

In this case, the scattering pattern is formed only on one surface of the light guide plate facing the main display panel.

However, in the dual liquid crystal display module having such a structure, when an external force is applied on the drop test and the sub display panel, the surface strength of the other surface of the light guide plate is weak so that the external force cannot be properly supported, and thus the diffusion sheet The bead layer of squeezed the surface of the light guide plate, so that the light guide plate had scratches and fine cracks on the surface. Furthermore, such scratches and cracks are transferred onto the main display panel, causing a great problem of transferring marks on the main display panel.

An object of the present invention, in applying a common light guide plate to a dual liquid crystal display module, by forming a strength reinforcement scattering pattern on each side of the common light guide plate to increase the surface strength and the transfer marks on the liquid crystal panel generated by external force It is to provide a dual liquid crystal display module and a mobile phone terminal having the same that can be prevented.

The object is, according to the present invention, a pair of liquid crystal panel is formed image; And a backlight unit disposed between the liquid crystal panels to respectively project light to the pair of liquid crystal panels, the backlight unit including a common light guide plate and a light source disposed on one side of the common light guide plate. It is achieved by a dual liquid crystal display module, characterized in that the intensity reinforcement scattering pattern for scattering the light generated from the light source while reinforcing the intensity of the common light guide plate is formed respectively.

Here, the pair of liquid crystal panels includes a main display panel and a sub display panel having a smaller size than the main display panel, and the intensity reinforcing scattering pattern is formed to face the sub display panel. And a second intensity reinforcement scattering pattern formed to face the main display panel, wherein the first intensity reinforcement scattering pattern has a greater density than the second intensity reinforcement scattering pattern. Can have

The first and second intensity reinforcing scattering patterns may be dot patterns formed of a combination of a plurality of protrusions.

The protrusion may have a hemispherical shape.

The backlight unit may include: a diffusion sheet disposed between the common light guide plate and the pair of liquid crystal panels to diffuse light toward the liquid crystal panel; A light collecting sheet disposed between the diffusion sheet and the pair of liquid crystal panels to collect light diffused from the diffusion sheet; And a light blocking tape adhered between the light collecting sheet and the pair of liquid crystal panels.

A first bead layer is formed on one surface of the diffusion sheet, and a second bead layer having a lower surface roughness than the first bead layer is formed on the other surface, and the first and second bead layers are each composed of a plurality of bead particles. Can be.

Each of the diffusion sheets may be disposed such that the second bead layer is adjacent to the common light guide plate.

Each of the diffusion sheets may be disposed such that the first bead layer is adjacent to the common light guide plate, and the first and second intensity reinforcing scattering patterns may have a greater density than the first bead layer.

The first bead layer may be made of urethane or nylon, and the second bead layer may be made of acrylic.

A plurality of light collecting sheets may be provided to form a plurality of layers, and each of the light collecting sheets may have a prism pattern arranged in a predetermined arrangement.

The display device may further include a mold frame supporting the liquid crystal panel and the backlight unit.

The dual liquid crystal display module may be provided in a mobile phone terminal.

According to the present invention, the strength reinforcement scattering patterns are formed on both surfaces of the common light guide plate, thereby increasing the surface strength and preventing the occurrence of transcription marks on the liquid crystal panel by external force.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is an exploded perspective view schematically illustrating a dual liquid crystal display module according to an exemplary embodiment of the present invention.

As shown in the figure, the dual liquid crystal display module according to an embodiment of the present invention forms an image on both liquid crystal panels through one common light guide plate, and allows a screen display area (not shown) to be substantially displayed. A pair of liquid crystal panels 100 having an image on the screen display area, a backlight unit 200 disposed between the pair of liquid crystal panels 100, and projecting light to the liquid crystal panel 100; The mold frame 300 supports the liquid crystal panel 100 and the backlight unit 200.

The liquid crystal panel 100 may include a plasma display panel (PDP), a liquid crystal display (LCD), an organic light emitting diode (OLED), a field emission display (FED), etc., but in this embodiment, the LCD panel is applied. do.

In detail with respect to the LCD panel, the LCD panel includes an upper glass and a lower glass that are partially faced with each other in a state in which a liquid crystal (not shown) is injected therein. Meanwhile, upper and lower polarizers (not shown, Polarizer Film) are adhered to outer surfaces of the upper glass and the lower glass, respectively.

The liquid crystal panel 100 is disposed on the opposite side of the main display panel 110 with the main display panel 110 and the backlight unit 200 interposed therebetween, and has a size smaller than that of the main display panel 110. The display panel 120 is configured. That is, the main display panel 110 and the sub display panel 120 are implemented by one backlight unit 200 disposed therebetween.

For example, when the liquid crystal panel 100 is applied to a folder type mobile phone terminal, the main display panel 110 is a panel located inside the mobile phone terminal folder which is not exposed to the outside while the mobile phone terminal is folded, The display panel 120 is a panel located outside the cellular phone folder that is exposed to the outside while the cellular phone is folded.

In the above description, the sub display panel 120 has a smaller size than the main display panel 110. Specifically, the sub display panel 120 has a small cross sectional area, but is not limited thereto. Hereinafter, for convenience of description, the sub display panel 120 is defined as a part that is exposed to the outside in a folded state of a device on which the liquid crystal panel 100 is mounted, and the main display panel 110 is a liquid crystal panel 100. The mounted device is defined as a part which is not exposed to the outside in a folded state.

The main display panel 110 and the sub display panel 120 have a screen display area capable of displaying an image substantially. The light shielding tapes 240 and 241 of the backlight unit 200 to be described later are leaked out of the screen display area. It is in charge of blocking things.

As shown in FIG. 1, the backlight unit 200 is disposed between two liquid crystal panels 100 to project light onto the main display panel 110 and the sub display panel 120, respectively. A common light guide plate 210 disposed between a pair of liquid crystal panels 100 so as to project light emitted from the light source, light emitted from the light source to the liquid crystal panel 100, and a common light guide plate 210. And the diffusion sheets 220 and 221 disposed between the liquid crystal panel 100 and the pair of liquid crystal panels 100 to diffuse light toward the liquid crystal panel 100, and the diffusion sheets 220 and 221 and the pair of liquid crystal panels 100, respectively. And the light condensing sheets 230 and 231 for condensing the light diffused from the diffusion sheets 220 and 221, and the light condensing sheets 230 and 231 and the pair of liquid crystal panels 100, and are attached to portions other than the screen display area of the liquid crystal panel 100. Includes shading tapes 240 and 241 to shield light from leaking out The.

In addition, the backlight unit 200 includes a flexible printed circuit board 250 having an LSI (large scale integration) for driving.

The light source may be applied to one selected from a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL) of an electron emission method by an electric field, and an external electrode fluorescent lamp (EEFL). The light source is mounted on a light source mounting flexible printed circuit board (not shown) mounted on one side of the mold frame 300.

The common light guide plate 210 converts a line or a point light source generated from a light source into a surface light source and projects it onto the liquid crystal panel 100. The common light guide plate 210 is made of a poly methyl metharylate acrylate (PMMA) or a polycarbonate (PC) material.

FIG. 2 is a cross sectional view of FIG. 1, and FIG. 3A is a schematic perspective view illustrating a common LGP of a dual liquid crystal display module according to an exemplary embodiment of the present invention, and FIG. 3B is a rear view of FIG. 3A.

As shown in FIG. 2, both surfaces of the common LGP 210 according to the exemplary embodiment of the present invention reinforce the surface strength of the common LGP 210 and scatter light generated from a light source to disperse the liquid crystal panel 100. First and second intensity reinforcing scattering patterns 211 and 212 for projecting to the light source are formed, respectively.

The first and second intensity reinforcing scattering patterns 211 and 212 may be formed of a combination of minute plurality of protrusions such as a dot pattern, and the protrusions may have a hemispherical shape and various cross-sectional shapes such as an ellipse and a polygon. May have

By such a structure, a fine air gap is formed between the common light guide plate 210 and the diffusion sheets 220 and 221 through a space between the plurality of protrusions, and the air gap is a bead of the diffusion sheets 220 and 221 to be described later. By preventing the layer from directly contacting the surface of the common light guide plate 210, the external force applied to the sub display panel 120 is buffered, thereby further preventing the transfer marks on the main display panel 110. You can do it. That is, it is possible to prevent occurrence of scratches and caulked portions on the surface of the common LGP 210 due to external force.

Similarly, the air gap buffers an external force applied on the main display panel 110 to prevent the transfer marks from occurring on the sub display panel 120.

The first and second intensity reinforcing scattering patterns 211 and 212 may be processed in various ways, such as screen printing and stampers, and the air gap may have a plurality of protrusions between the common light guide plate 210 and the diffusion sheets 220 and 221 and beads described later. The remaining microspace except for these.

In conclusion, in the present invention, an air gap is formed between the common LGP 210 and the diffusion sheets 220 and 221 disposed on both sides of the common LGP 210 and formed on the main display panel 110 or the sub display panel 120. When an external force is applied, the air gap buffers the external force to prevent transfer from occurring to the opposite display panel.

On the other hand, if the strength reinforcement scattering pattern is formed of the projections of the same size and shape on both sides of the common light guide plate 210, the common light guide plate 210 and the sub display panel ( The air gap between the first diffusion sheet 220 adjacent to the 120 is the same as the air gap between the common light guide plate 210 and the second diffusion sheet 221 adjacent to the main display panel 110. In this case, since the sub display panel 120 has a relatively small cross-sectional area compared to the main display panel 110, the sub display panel 120 has a smaller cross-sectional area when an external force having the same magnitude is applied to the main display panel 110 and the sub display panel 120. The external force applied to the display panel 120 is weaker than the external force applied to the main display panel 110.

As shown in FIGS. 2 and 3, first and second intensity reinforcement scattering patterns 211 and 212 for reinforcing surface strength are formed on both surfaces of the common LGP 210, but the sub display panel 120 is disposed on the sub display panel 120. In order to more reliably prevent the transfer from occurring on the main display panel 110 when external force is applied to the main display panel, the first intensity reinforcing scattering pattern 211 formed to face the sub display panel 120 is provided. It is preferable to have a greater density than the second intensity reinforcing scattering pattern 212 formed to face 110.

Specifically, the protrusion of the first intensity reinforcement scattering pattern 211 formed to face the sub display panel 120 is formed of the second intensity reinforcement scattering pattern 212 formed to face the main display panel 110. It is desirable to have a size smaller than the projection.

Therefore, the mutual contact area between the first strength reinforcement scattering pattern 211 and the second bead layer 261 described later is the mutual contact between the second intensity reinforcement scattering pattern 212 and the second bead layer 261. By making it larger than the area, in particular, the external force applied on the sub display panel 120 can be more efficiently distributed to prevent the aforementioned transfer from occurring.

On the other hand, when the external force described above is a small pressure of a predetermined or less, or when the main display panel 110 and the sub display panel 120 has substantially the same cross-sectional area, both sides of the common light guide plate 210 have the same size and shape. Even if the first and second strength reinforcement scattering patterns 211 and 212 formed of the protrusions are formed, there is no large force.

The diffusion sheets 220 and 221 are respectively disposed between the common light guide plate 210 and the pair of liquid crystal panels 100 to diffuse light generated from the common light guide plate 210 toward the liquid crystal panel 100, so-called diffuser sheets. Also called. In addition, the diffusion sheets 220 and 221 may play a role of hiding the first and second intensity reinforcing scattering patterns 211 and 212 formed on the surface of the common LGP 210 when the liquid crystal panel 100 is viewed from the outside.

One surface of the diffusion sheets 220 and 221 is formed by coating a first bead layer 260, and the other surface is formed by coating a second bead layer 261 having a smaller surface roughness than one surface. The first and second bead layers 260 and 261 may prevent light from being partially concentrated by dispersing light incident on the diffusion sheets 220 and 221.

Here, the first and second bead layers 260 and 261 are composed of a plurality of bead particles, respectively, the first bead layer 260 is made of beads having a size of about 9 ~ 11㎛ and made of urethane or nylon material Can be. In addition, the second bead layer 261 may be formed of beads having a size of about 3 to 5 μm and made of acrylic material.

In the embodiment of the present invention, as shown in FIG. 2, when the respective diffusion sheets 220 and 221 are disposed with respect to the common light guide plate 210, the second bead layer 261 is adjacent to the common light guide plate 210. To place. In this case, the second bead layer 261 is in contact with the first and second intensity reinforcing scattering patterns 211 and 212 to form a sufficient air gap between the diffusion sheets 220 and 221 and the light guide plate 210. As a result, the pressure applied to the main or sub display panels 110 and 120 from the outside may be further reduced from being transmitted to the common LGP 210.

In addition, as described above, the main body is caused by an external force applied on the sub display panel 120 through first and second intensity reinforcing scattering patterns 211 and 212 respectively formed on both surfaces of the common LGP 210 to reinforce surface strength. It is possible to prevent the transfer marks on the display panel 110 from occurring twice. Similarly, the transfer marks may be prevented from occurring on the sub display panel 120 even when an external force is applied on the main display panel 110.

Meanwhile, in addition to the above-described structure, each of the first and second diffusion sheets 220 and 221 may be disposed such that the first bead layer 260 is adjacent to the common light guide plate 210. In this case, the first intensity reinforcement scattering pattern of the common LGP 210 to prevent the first bead layer 260 from directly contacting the remaining surfaces except for the first intensity reinforcement scattering pattern of the common LGP 210. 211) preferably has a greater density than the first bead layer.

Similarly, the second intensity reinforcing scattering pattern 212 of the common LGP 210 also has a greater density than the first bead layer 260.

The light collecting sheets 230 and 231 are disposed between the diffusion sheets 220 and 221 and the pair of liquid crystal panels 100, respectively, and include a base film made of PET resin and a lenticular lens formed to have a predetermined arrangement on the upper surface of the base film. C) or prism pattern 232.

The light collecting sheets 230 and 231 collect light diffused from the diffusion sheets 220 and 221 in a direction perpendicular to a plane of the main display panel 110 and the sub display panel 120, and collect the light collecting sheets 230 and 231. Most of the light passes through the main display panel 110 and the sub display panel 120 to provide a uniform luminance distribution.

In this case, the light collecting sheets 230 and 231 may be used as a single layer, but a plurality of light collecting sheets 230 and 231 may be applied to have at least two layers to realize high brightness. That is, the prism type light collecting sheet and the lenticular lens type light collecting sheet can overlap each other, and can also be used by overlapping two or more prism type light collecting sheets. Similarly, two or more lenticular lens type light collecting sheets can be overlapped. Can be used. In FIG. 2, an example of overlapping a prism type light collecting sheet is illustrated, but is not limited thereto.

The light blocking tapes 240 and 241 are bonded between the light collecting sheets 230 and 231 and the pair of liquid crystal panels 100 to prevent light from leaking to portions other than the screen display areas of the main display panel 110 and the sub display panel 120. The liquid crystal panel 100 is coupled to the mold frame 300 and fixed at the same time.

In the light blocking tapes 240 and 241, one region of the upper surface is bonded to the lower surface of the liquid crystal panel 100, and one region of the lower surface is bonded to the inner edge of the mold frame 300 and the upper surfaces of the light collecting sheets 230 and 231. In addition, the light blocking tapes 240 and 241 may have a rectangular closed loop shape because the liquid crystal panel 100 has a rectangular structure.

The mold frame 300 supports the liquid crystal panel 100 and the backlight unit 200 and at the same time buffers external pressure applied to the surface to minimize damage and damage of the liquid crystal panel 100 and the backlight unit 200. It may be made of a synthetic resin material.

The dual liquid crystal display module according to the embodiment of the present invention described above may be applied to various devices including a liquid crystal panel, such as an LCD TV, a PDA, a navigation, a DMB, a monitor, in addition to a mobile phone terminal.

In addition, the aforementioned devices such as a mobile phone terminal may be a device having a touch panel that responds to a user's touch.

As described above, the present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention, which will be apparent to those skilled in the art. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

For example, the light guide plate and the diffusion sheet of the dual liquid crystal display module according to the embodiment of the present invention may be applied to a one-way liquid crystal module instead of the dual liquid crystal display module.

1 is an exploded perspective view schematically illustrating a dual liquid crystal display module according to an exemplary embodiment of the present invention.

2 is a cross sectional view of FIG. 1.

3A is a schematic perspective view of a common LGP of a dual liquid crystal display module according to an exemplary embodiment of the present invention.

3B is a rear view of FIG. 3A.

* Explanation of symbols for the main parts of the drawings

100: liquid crystal panel 110: main display panel

120: sub display panel 200: backlight unit

210: light guide plate 211: scattering pattern for the first intensity reinforcement

212: second intensity reinforcement scattering pattern 220: first diffusion sheet

221: second diffusion sheet 230, 231: light collecting sheet

232: prism pattern 240, 241: shading tape

250: flexible circuit board 260: first bead layer

261: second bead layer 300: mold frame

Claims (12)

A pair of liquid crystal panels in which an image is formed; And A backlight unit disposed between the liquid crystal panels to project light onto the pair of liquid crystal panels, the backlight unit including a common light guide plate and a light source disposed on one side of the common light guide plate, Dual-sided liquid crystal display module, characterized in that each side of the common light guide plate, the strength reinforcement scattering pattern for scattering the light generated from the light source while reinforcing the strength of the common light guide plate. The method of claim 1, The pair of liquid crystal panels includes a main display panel and a sub display panel having a relatively smaller size than the main display panel. The intensity reinforcement scattering pattern includes a first intensity reinforcement scattering pattern formed to face the sub display panel and a second intensity reinforcement scattering pattern formed to face the main display panel, The first intensity reinforcement scattering pattern has a greater density than the second intensity reinforcement scattering pattern. The method of claim 2, The first and second intensity reinforcing scattering pattern is a dual liquid crystal display module, characterized in that the dot pattern consisting of a combination of a plurality of projections. The method of claim 3, The projection is a dual liquid crystal display module, characterized in that having a hemispherical shape. The method of claim 1, The backlight unit, A diffusion sheet disposed between the common light guide plate and the pair of liquid crystal panels to diffuse light toward the liquid crystal panel; A light collecting sheet disposed between the diffusion sheet and the pair of liquid crystal panels to collect light diffused from the diffusion sheet; And And a light blocking tape adhered between the light collecting sheet and the pair of liquid crystal panels. The method of claim 5, A first bead layer is formed on one surface of the diffusion sheet, and a second bead layer having a lower surface roughness than the first bead layer is formed on the other surface. And the first and second bead layers are each composed of a plurality of bead particles. The method of claim 6, Wherein each of the diffusion sheets is disposed such that the second bead layer is adjacent to the common light guide plate. The method of claim 6, Each diffusion sheet is disposed such that the first bead layer is adjacent to the common light guide plate. The first and second intensity reinforcement scattering patterns have a greater density than the first bead layer. The method of claim 6, Wherein the first bead layer is made of urethane or nylon, and the second bead layer is made of acrylic. The method of claim 5, The plurality of light collecting sheets are provided with a plurality to form a plurality of layers, each of the dual liquid crystal display module characterized in that it has a prism pattern arranged in a predetermined arrangement. The method of claim 1, And a mold frame for supporting the liquid crystal panel and the backlight unit. A mobile terminal comprising the dual liquid crystal display module of claim 1.

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