KR20090060707A - Liquid crystal display module and portable phone having the same - Google Patents

Abstract

A liquid crystal display module and a terminal including the same are provided to prevent a flexible printed circuit board from getting loose from a mold frame by having a simple structure. A liquid crystal display(LCD) module(10) comprises a flexible printed circuit board(70), a bottom chassis(60) and an FPCB presser(65). One side of the flexible printed circuit board is connected to an LCD panel(30) in which an image is formed and the other side supports the LCD panel and a backlight unit(40) for transmitting the light to the LCD panel. The flexible printed circuit board is arranged at the rear side of a mold frame(50). The bottom chassis is coupled with the mold frame as the flexible printed circuit board is positioned between the bottom chassis and mold frame. The FPCB presser is prepared in the bottom chassis.

Description

Liquid crystal display (LCD) module and terminal with same {Liquid Crystal Display Module and Portable Phone Having the Same}

The present invention relates to a liquid crystal display (LCD) module and a terminal having the same, and more particularly, to a liquid crystal display (LCD) module having a simple structure and capable of preventing lifting of a flexible circuit board to a mold frame. It relates to one terminal.

The terminal refers to a personal cellular phone including a PCS phone, a PDA and the like. For modern people, terminals have become a necessity, not a luxury item. For this reason, terminal manufacturers often release new products by incorporating new technologies or make their exterior designs colorful. There is a trend.

Such a terminal may be divided into an input device for inputting information and a display device for outputting input information or displaying external information. Among the display devices, the liquid crystal display device is in the spotlight as the next generation display device, and accordingly, day by day has been developed.

On the other hand, as described above, the liquid crystal display device is used in various fields, depending on the size of a small liquid crystal display (LCD) module mounted on a mobile phone or a digital camera, and a large liquid crystal display (LCD) used for a monitor of a TV or a computer You can name them by module. Herein, the term “small liquid crystal display” (LCD) module is defined as referring to 4 inches or less.

1 is a view for explaining a schematic configuration of a liquid crystal display (LCD) module according to a conventional embodiment. As shown in the drawing, a liquid crystal display (LCD) module 110 according to a conventional embodiment is The LCD panel 130, the backlight unit 140, the mold frame 150 supporting them, the lower chassis 160 coupled to the mold frame 150, and one side of the LCD panel 130 are coupled to the LCD panel 130. The other side is coupled to the rear surface of the mold frame 150 to be described later, and on one surface facing the rear surface of the mold frame 150, a plurality of light emitting diode lamps 172 for emitting light toward the plate surface direction of the light guide plate 141 are mounted in a line. The flexible printed circuit board 170 (FPCB) is provided.

The LCD panel 130 is a portion having a screen display area capable of substantially displaying images, and generally includes a thin film transistor substrate 132, a color filter substrate 131, and a liquid crystal layer (not shown) injected therebetween. It is provided.

Since the backlight unit 140 is adopted in such a manner that the LCD panel 130 does not emit light by itself and adjusts the transmittance of the light, the LCD panel 130 is formed so that a predetermined image is formed on the LCD panel 130. ) Is responsible for projecting light.

The backlight unit 140 is a direct method of projecting light directly toward the front of the LCD panel 130 by arranging a light source on one side of the LCD panel 130, and on one side or a plurality of side surfaces of the LCD panel 130. By arranging a line light source or a point light source, the light guide plate 141 and the reflective sheet 142 may be divided into an edge method for reflecting and diffusing light rays. At present, terminals such as mobile communication terminals such as mobile phones, PDAs, etc. mainly adopt the latter method.

One side of the flexible printed circuit board 170 having the plurality of light emitting diode lamps 172 mounted thereon is bent to one side of the mold frame 150 and disposed on the rear surface of the mold frame 150, as shown in FIG. 1. In this case, the plurality of light emitting diode lamps 172 are disposed at one side of the light guide plate 141, and the light emitted from the light emitting diode lamp 172 is transmitted to the LCD panel 130 through the light guide plate 141. Can be delivered.

Meanwhile, in the related art, the flexible circuit board 170 is flexible due to the flexibility of the flexible circuit board 170 in a process in which the flexible circuit board 170 is bent to one side of the mold frame 150 and disposed on the rear surface of the mold frame 150. In order to prevent the substrate 170 from lifting against the rear surface of the mold frame 150, the double-sided tape 175 may be interposed between the flexible circuit board 170 and the rear surface of the mold frame 150.

However, the prior art of interposing the double-sided tape 175 therebetween has the advantage of maintaining the adhesion between the two, but on the contrary, by adhering the double-sided tape 175 to join the two Not only is a process required, but it is not easy to separate the flexible circuit board 170 from the mold frame 150 by the adhesive force of the double-sided tape 175, so there is a problem in that rework is not easy.

Therefore, the development of a liquid crystal display (LCD) module having a simple structure that allows the flexible circuit board 170 to closely adhere to the mold frame 150 so that the light emitting diode lamp 172 is positioned at an accurate position of one side of the light guide plate 141. This is necessary.

An object of the present invention, as a simple structure can prevent the lifting of the flexible circuit board to the mold frame, which can reduce the tact time in the assembly process as well as facilitate rework. It is to provide a liquid crystal display (LCD) module and a terminal having the same.

The object is, according to the present invention, one side is connected to the LCD panel on which the image is formed, the other side is a flexible circuit board disposed on the back of the mold frame for supporting the LCD panel and the backlight unit for projecting light to the LCD panel (FPCB, Flexible Printed Circuit Board); A lower chassis coupled to the mold frame with the flexible circuit board interposed therebetween; And an FPCB pressing unit provided in the lower chassis to prevent the flexible circuit board from being separated from the rear surface of the mold frame by pressing the flexible circuit board when the mold frame is coupled to the mold frame. LCD) module and a terminal having the same.

The FPCB pressing unit may be at least one leaf spring protruding from the plate surface of the lower chassis toward the rear surface of the mold frame to elastically press the flexible circuit board to the rear surface of the mold frame.

The leaf spring may be integrally formed with the lower chassis.

The leaf spring is preferably manufactured by partial cut bending molding of the lower chassis.

The leaf spring is preferably provided at one side of the lower surface of the lower chassis corresponding to the portion where the flexible circuit board is bent.

Support grooves are formed in both side regions of the flexible circuit board so that the flexible circuit board is supported with respect to the mold frame, and support protrusions for coupling the support grooves are protruded in both side regions of the rear surface of the mold frame. Preferably, the lower chassis has protrusion grooves through which the support protrusions are coupled.

The lower chassis may include a chassis flat plate coupled to a rear surface of the mold frame; And a chassis sidewall portion standing up at an edge of the chassis plane plate and surrounding the sidewall of the mold frame, wherein a free end formed by cutting after at least a portion of the chassis plane plate is cut by a press mold. By bending to, at least one of the chassis flat plate and the chassis side wall portion may be provided as a double wall.

According to the present invention, it is possible to prevent the lifting of the flexible circuit board with respect to the mold frame as a simple structure, thereby reducing the tact time in the assembling process as well as facilitating rework.

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.

2 is a perspective view of a terminal equipped with a liquid crystal display (LCD) module according to an embodiment of the present invention.

As shown in this figure, the terminal 1 according to an embodiment of the present invention is a foldable cellular phone 1, which includes a main body 2 and a folder for opening and closing the front of the main body 2. (3) and the hinge (9, Hinge) provided between the main body portion 2 and the folder portion (3) so that the main body portion 2 and the folder portion (3) can rotate in a direction relative to each other, Battery 4 is detachably coupled to the back of the unit (2).

A plurality of key buttons 5 are provided on the inner surface of the main body 2. The lower part of the key buttons 5 is provided with a microphone 6 for transmitting a voice, and the upper function buttons 7 are provided. The function buttons 7 are used to search for various menus stored in the terminal 1 or select a function, unlike the key buttons 5 for inputting a phone number or a letter.

Above the inner surface of the folder section 3, a receiver 8 for receiving voices from the counterpart is formed. In the lower part of the receiver 8, a liquid crystal display (LCD) module 10 including a phone number, a state of charge of the battery 4, a vibration state, an alarm state display, and the like is formed.

3 is an exploded perspective view of the liquid crystal display (LCD) module illustrated in FIG. 2, FIG. 4 is a perspective view partially combining FIG. 3, FIG. 5 is a vertical cross-sectional view of FIG. 4, and FIG. 6 is an angle illustrated in FIG. 5. Vertical cross-sectional view of components joined together.

As shown in these figures, the liquid crystal display (LCD) module 10 according to an embodiment of the present invention, the LCD panel 30 has a screen display area capable of substantially image display and the image is formed in the screen display area LCD panel, a backlight unit 40 disposed at the rear side of the LCD panel 30 to project light onto the LCD panel 30, and supports the LCD panel 30 and the backlight unit 40. Mold frame 50, the lower chassis 60 surrounding the mold frame 50, and one side is coupled to the LCD panel 30 and the other side is coupled to the back of the mold frame 50 to be described later and the mold A flexible printed circuit board 70 (FPCB, Flexible Printed Circuit Board) having a plurality of light emitting diode lamps 72 mounted in a line is arranged on one surface facing the rear surface of the frame 50 in a direction toward the plate surface of the light guide plate 141. It is provided. However, in the present exemplary embodiment, the plurality of light emitting diode lamps 72 are mounted on one surface of the flexible circuit board 70, but a separate LED mounting FPCB (not shown) is provided to be adjacent to one side of the light guide plate 41. It may be coupled to the mold frame 50 to be.

First, the LCD panel 30 includes a color filter (CF) substrate 31 in which a predetermined color is expressed while light passes, and a thin film transistor (TFT) in which a thin film transistor and a pixel electrode in a matrix form are formed. Thin Film Transistor) A substrate 32, a liquid crystal layer (not shown) injected therebetween, and a driving chip (not shown) for driving a thin film transistor are provided. In addition, a polarizing plate (not shown) is attached to the upper surface of the color filter substrate 31 and the lower surface of the thin film transistor substrate 32.

As shown in FIG. 3, the backlight unit 40 is disposed at the rear side of the LCD panel 30 to project light to the LCD panel 30. The backlight unit 40 and the lower portion of the light guide plate 41 are provided. Light-shielding tape bonded between the reflective sheet 42 disposed on the light guide plate, the pair of diffusion sheets 43 and 44 disposed on the light guide plate 41, and the LCD panel 30 and the diffusion sheets 43 and 44. 45 is provided.

First, the light guide plate 41 is provided as a substantially rectangular tubular body, as shown in FIG. However, the light guide plate 41 may be provided with an upper surface flat toward the diffusion sheets 43 and 44, and a lower surface thereof may be provided with a narrower width from one end to the other end.

Reflective sheet 42 is disposed to be substantially the same as the area of the light guide plate 41 to prevent light from leaking to the lower portion of the light guide plate 41 as well as to reflect the leaked light again through the light guide plate 41 through the LCD panel ( 30) to lead to the side. One surface of the reflective sheet 42, that is, the surface facing the light guide plate 41 forms a mirror-like mirror, and the reflective sheet 42 may be coupled to the rear surface of the mold frame 50 by the double-sided tape 47. .

The diffusion sheets 43 and 44 serve to diffuse light generated from the light guide plate 41. Although no pattern is shown on the surfaces of the diffusion sheets 43 and 44 in the drawings of the present embodiment, a plurality of continuous dot patterns are provided on the surfaces of the diffusion sheets 43 and 44 in order to efficiently diffuse light. Can be formed. In addition, although light is uniform due to light diffusion, a prism sheet (not shown) in which a prism pattern is formed may be used to prevent a decrease in brightness caused by side effects.

The light shielding tape serves to shield light from leaking to a portion outside the screen display area of the LCD panel 30.

By the configuration of the backlight unit 40, after the light emitted from the light emitting diode lamp 72 to be described later enters the light guide plate 41, and proceeds along the plate surface of the light guide plate 41, the light is reflected and scattered. A part of the light source is directed toward the diffusion sheets 43 and 44 on the upper part of the light guide plate 41, and the other part is directed to the reflective sheet 42 positioned below the light guide plate 41. The light directed to the reflecting sheet 42 is reflected by the reflecting sheet 42 and then moved back to the diffusion sheets 43 and 44 via the light guide plate 41. The light diffused through the diffusion sheets 43 and 44 is uniformly diffused through the diffusion sheets 43 and 44 and then incident on the LCD panel 30. Accordingly, the user can see the image formed on the LCD panel 30.

As shown in FIG. 3, the mold frame 50 supports the LCD panel 30 and the backlight unit 40 therein, and the other side of the flexible circuit board 70 is disposed in the rear direction thereof. It can be formed integrally by injection molding.

The mold frame 50 is made of synthetic resin such as polycarbonate, and has a predetermined flexibility. As a result, even if an impact is applied from the outside, the mold frame 50 can be buffered to some extent so that the LCD panel 30 is located inside the mold frame 50. ) And the backlight unit 40 can be prevented from being damaged by the impact.

As shown in FIGS. 3 and 4, the lower chassis 60 is formed at the edges of the chassis flat plate 61 and the chassis flat plate 61 having a rectangular plate shape coupled to the rear portion of the mold frame 50. The chassis side wall portion 63 which stands up and surrounds and supports the outer wall of the mold frame 50 and protrudes from the surface of the chassis flat plate in the rear direction of the mold frame 50 to form the flexible circuit board 70 in the mold frame ( 50 is provided with the FPCB pressurizing part 65 which presses in a back direction. However, the configuration and role of the FPCB pressing unit 65 will be described in detail when the flexible circuit board 70 is described.

On the other hand, the flexible circuit board 70, as shown in detail in Figures 3 and 4, one end is connected to the LCD panel 30, the other end is disposed on the back of the mold frame 50. Since the flexible circuit board 70 is flexible, it can be bent, overlapped, folded, curled, twisted, or the like, and thus, the effective use of space and three-dimensional wiring can be provided.

In the flexible circuit board 70 according to the present embodiment, a plurality of light emitting diode lamps 72 emitting light in the direction of the plate surface of the light guide plate 41 are arranged in one line on one surface of the flexible circuit board 70 facing the mold frame 50. It is mounted. Therefore, only when the flexible circuit board 70 is in close contact with the rear surface of the mold frame 50, one side of the light guide plate 41 and the positions of the plurality of light emitting diode lamps 72 may be aligned. Light emitted from the lamp 72 may be uniformly transmitted to the LCD panel 30 via the light guide plate 41.

However, for example, when the flexible circuit board 70 has its own flexibility, when the light is lifted from the rear surface of the mold frame 50, the position of the light emitting diode lamp 72 with respect to one side of the light guide plate 41 is shifted so that the light guide plate 41 may be shifted. Proper light cannot be emitted in the direction of the plate surface, which reduces the reliability of light transmitted to the LCD panel 30.

Therefore, in order to prevent the flexible circuit board 70 from being lifted from the back of the mold frame 50, as described above, the flexible circuit board (see FIG. 1) is conventionally interposed therebetween. 170) to maintain the close contact between the mold frame 150. However, this conventional method not only has the inconvenience of interposing the double-sided tape 175 therebetween by a separate process, but also increases the tact time required for the manufacturing process, and also maintains. When required, there was a problem in that it was not easy to separate the flexible circuit board 170 from the mold frame 150.

Accordingly, the liquid crystal display (LCD) module 10 of the present embodiment can maintain the close contact of the flexible circuit board 70 to the back of the mold frame 50 by a simple structure and method, that is, the mold frame The FPCB pressing part 65 presses the flexible circuit board 70 in the direction toward 50.

5 and 6, the FPCB pressing unit 65 includes a flexible circuit such that the flexible circuit board 70 having a plurality of light emitting diode lamps 72 mounted on the rear surface of the mold frame 50 is in close contact with the flexible circuit board 70. As a component for pressing the substrate 70 in the rear direction of the mold frame 50, the substrate 70 is provided to protrude to the inside of the chassis flat plate 61 of the lower chassis 60.

In detail, the FPCB pressing unit 65 according to the present embodiment cuts a portion of the chassis flat plate 61 into a "c" shape by a press die, and then frees the free end formed by the cutting. A leaf spring (65) provided by stepwise bending, wherein when the lower chassis (60) is coupled to the mold frame (50), the leaf spring (65) presses a region of the flexible circuit board (70) by elastic force to form a flexible circuit. The substrate 70 may be in close contact with the rear surface of the mold frame 50.

The FPCB pressing unit 65 is provided on the chassis flat plate 61 so as to be adjacent to the portion where the flexible circuit board 70 is bent. This is because the flexible printed circuit board 70 may be bent against one side of the mold frame 50 so that the flexible printed circuit board 70 may be lifted with respect to the rear surface of the mold frame 50.

Meanwhile, in order to align the exact position of the flexible printed circuit board 70 with respect to the rear surface of the mold frame 50, as shown in FIG. 4, flexible circuits are provided at both sides of the rear surface of the mold frame 50. A support protrusion 52 coupled to the support groove 73 of the substrate 70 is provided to protrude, and the support protrusion 52 to which the support groove 73 of the flexible circuit board 70 is coupled to the lower chassis 60 is provided. Protruding groove 67 is coupled is formed through. By this configuration, the flexible printed circuit board 70 may be supported at the correct position of the mold frame 50, and then the lower chassis 60 may be easily coupled to the mold frame 50.

As described above, the FPCB pressing unit 65 for pressing the flexible printed circuit board 70 in the rear direction of the mold frame 50 is provided on the lower chassis 60 coupled to the mold frame 50, but only the lower chassis 60 is provided. ) To the mold frame 50 can prevent the flexible circuit board 70 from lifting from the mold frame 50.

Hereinafter, a manufacturing method of the liquid crystal display (LCD) module 10 having such a configuration will be described.

Referring to FIGS. 3 to 6, first, an LCD panel 30 having one end of the backlight unit 40 and the flexible printed circuit board 70 electrically coupled to the mold frame 50 is coupled. Thereafter, the flexible circuit board 70 is bent with respect to one side of the mold frame 50 so that the other side of the flexible circuit board 70 is disposed on the rear surface of the mold frame 50. Subsequently, the support protrusions 52 protruding from the mold frame 50 pass through the support grooves 73 formed at both sides of the flexible circuit board 70 so that the flexible circuit board 70 with respect to the mold frame 50 may be formed. Align

Next, the lower chassis 60 is coupled to the mold frame 50 to surround the back and sidewalls of the mold frame 50. At this time, in the lower region of the chassis flat plate 61 of the lower chassis 60, the FPCB pressing portion 65, that is, the leaf spring 65 of the present embodiment, which presses the flexible circuit board 70 in the mold frame 50 direction. The lower chassis 60 is coupled to the mold frame 50 to press the flexible circuit board 70, and thus the flexible circuit board 70 may be in close contact with the mold frame 50 to maintain the state. .

In addition, the FPCB pressing unit 65 maintains the flexible circuit board 70 in close contact with the rear surface of the mold frame 50, thereby providing a light emitting diode lamp 72 and a light guide plate mounted on one surface of the flexible circuit board 70. One side of the 41 may be adjacent to each other, so that the light emitted from the light emitting diode lamp 72 may be properly moved in the direction of the plate surface of the light guide plate 41 so that a reliable screen on the LCD panel 30 may be provided. Can be displayed.

As described above, according to the present exemplary embodiment, the lower chassis 60 having the FPCB pressing unit 65 for pressing the flexible circuit board 70 is coupled to the mold frame 50 to connect the flexible circuit board to the mold frame 50. It is possible to prevent the lifting of the 70, because of this, the tact time required for the work does not need to intervene to prevent the lifting of the flexible circuit board 70 for the mold frame 50 (Tact Time) ), And also facilitates rework.

On the other hand, with reference to the accompanying drawings will be described a liquid crystal display (LCD) module according to another embodiment of the present invention as follows. However, the same description as that described in the liquid crystal display (LCD) module according to an embodiment of the present invention will be omitted.

FIG. 7 is a diagram illustrating a configuration of a liquid crystal display (LCD) module according to another embodiment of the present invention. As shown in the drawing, the liquid crystal display (LCD) module 10a of the present embodiment is one of the above-described embodiments of the present invention. Although substantially similar to the liquid crystal display (LCD) module 10 (see FIGS. 3 to 5) according to the embodiment, there are differences in the configuration of the lower chassis 60a.

As shown in FIG. 6, the lower chassis 60a of the present embodiment is formed by cutting after a partial region of the chassis flat plate 61a, that is, the upper region of the FPCB pressing portion 65a is cut by the press mold. The free end is bent inward to provide the chassis flat plate 61a and the chassis side wall portion 63a as double walls.

This configuration can improve the strength of the lower chassis 60a compared to the prior art, and thus, the mold frame 50a that supports the LCD panel (not shown) and the backlight unit 40a more reliably even when an external impact is applied. Can support In addition, since a separate member is not required to provide a double wall, a double wall is provided by using a part of the chassis flat plate 61a, and thus, manufacturing is easy and cost is not increased.

In the above-described embodiment, the liquid crystal display (LCD) module is provided in the foldable terminal, but the above-described liquid crystal display (LCD) is also applied to a sliding cell phone, a bar-shaped cell phone, a flip-type cell phone, etc. Of course, the module may be provided.

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. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

1 is a view for explaining a schematic configuration of a liquid crystal display (LCD) module according to a conventional embodiment.

2 is a perspective view of a terminal equipped with a liquid crystal display (LCD) module according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of the liquid crystal display (LCD) module shown in FIG. 2.

4 is a perspective view partially combining FIG. 3.

5 is a vertical cross-sectional view of FIG. 4.

FIG. 6 is a vertical cross-sectional view of the components illustrated in FIG. 5.

FIG. 7 is a partially exploded perspective view illustrating the configuration of a liquid crystal display (LCD) module according to another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

1 terminal 10 liquid crystal display (LCD) module

30 LCD panel 40 Backlight unit

41: light guide plate 42: reflective sheet

50: mold frame 60: lower chassis

65: FPCB pressing unit 70: flexible circuit board

72: light emitting diode lamp

Claims (8)

A flexible printed circuit board (FPCB) disposed at a rear side of a mold frame, the one side of which is connected to an LCD panel on which an image is formed, and the other side of the mold frame, which supports the LCD panel and a backlight unit that projects light to the LCD panel; A lower chassis coupled to the mold frame with the flexible circuit board interposed therebetween; And A liquid crystal display (LCD) comprising an FPCB pressing unit provided in the lower chassis to prevent the flexible circuit board from being separated from the rear surface of the mold frame by pressing the flexible circuit board when combined with the mold frame; ) module. The method of claim 1, The FPCB pressing unit is a liquid crystal display (LCD) module, characterized in that at least one leaf spring protruding from the plate surface of the lower chassis toward the back of the mold frame to elastically press the flexible circuit board to the back of the mold frame. . The method of claim 2, The leaf spring is formed integrally with the lower chassis, characterized in that the liquid crystal display (LCD) module. The method of claim 3, And said leaf spring is produced by partial bending bending forming of said lower chassis. The method of claim 4, wherein The plate spring is a liquid crystal display (LCD) module, characterized in that provided on one side of the lower surface of the lower chassis corresponding to the bending portion of the flexible circuit board. The method of claim 1, Support grooves are formed in both side regions of the flexible circuit board so that the flexible circuit board is supported with respect to the mold frame, and support protrusions for coupling the support grooves are protruded in both side regions of the rear surface of the mold frame. Liquid crystal display (LCD) module, characterized in that the lower chassis is formed through the projection groove coupled to the support projection. The method of claim 1, The lower chassis, A chassis flat plate coupled to a rear surface of the mold frame; And Further comprising a chassis side wall portion standing up at the edge of the chassis flat plate surrounding the side wall of the mold frame, After at least a portion of the chassis flat plate is cut by the press die, the free end formed by the cutting is bent inward, so that at least one of the chassis flat plate and the chassis side wall portion is provided as a double wall. Liquid Crystal Display (LCD) Module. A terminal comprising the liquid crystal display (LCD) module of claim 1.

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