KR20060093832A - Liquid crystal display - Google Patents

Abstract

A liquid crystal display device having a structure capable of increasing the efficiency of assembly work is provided. The liquid crystal display device includes a liquid crystal panel assembly for displaying image information, a backlight unit for providing light to the liquid crystal panel assembly, and an upper side accommodating the liquid crystal panel assembly and the backlight unit in the sidewalls with sidewalls formed along edges of the upper surface. The container and one or more projections for applying pressure to the backlight unit are formed on the bottom surface, and includes a lower storage container covering the lower surface of the backlight unit and engaging with the upper storage container.

LCD, Storage Container, Projection

Description

Liquid crystal display

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

2 is a modification of the lower housing of the present invention.

3 is a modification of the lower housing of the present invention.

4 is a modification of the lower housing of the present invention.

5 is a modification of the lower housing of the present invention.

(Explanation of symbols for the main parts of the drawing)

100: liquid crystal display device 110: flexible printed circuit board

130: liquid crystal panel assembly 131: drive IC

133: TFT substrate 134: color filter substrate

135: liquid crystal panel 140: upper storage container

141: optical sheets 142: light guide plate

143: lamp assembly 145: hook

146: reflective sheet 170, 270, 370, 470, 570: lower storage container

172: hook insertion hole 174: projection

The present invention relates to a display device, and more particularly to a liquid crystal display device.

Cathode ray tube (CRT), which is one of the display devices that are generally used, is mainly used for monitors such as televisions, measuring devices, information terminal devices, etc., but due to its own weight and size, It could not actively respond to the demand for miniaturization and weight reduction.

In order to replace the cathode ray tube, it has advantages such as small size, light weight, low power consumption, and the like, and a liquid crystal display device which displays information by using the electrical and optical properties of the liquid crystal injected into the liquid crystal panel has been actively developed. Recently, it plays a role as a flat panel display device. In general, a liquid crystal display device is a display device having low power consumption, light weight, and small volume. The liquid crystal display device has been widely applied to a wide range of industries, for example, the computer industry, the electronics industry, and the information and communication industry due to such unique advantages. As a matter of fact, the liquid crystal display device having such advantages has been applied to various fields such as a display device of a portable computer, a monitor of a desktop computer, a monitor of a high-definition video device, and the like.

The liquid crystal display is largely divided into twisted nematic (TN) and super-twisted nematic (STN) methods, and the active matrix display method using a switching element and a TN liquid crystal and a passive matrix using an STN liquid crystal due to the difference in driving method. There is a passive matrix display method.

The big difference between these two methods is that the active matrix display method is used for TFT-LCD, which drives the LCD using the TFT as a switch, and the passive matrix display method does not use transistors, thus requiring a complicated circuit. Do not LCDs using TFTs are widely used in recent years with the spread of portable computers.

The liquid crystal panel assembly includes a liquid crystal panel formed by joining two substrates, for example, a TFT substrate and a color filter substrate, and injecting a liquid crystal material having anisotropic dielectric constant therebetween, and mounted on the liquid crystal panel by a chip on glass (COG) method. And a flexible printed circuit board for connecting a printed circuit board for transmitting predetermined data and control signals to the gate IC and a driving IC for applying a driving signal to the gate line and the data line, respectively. The liquid crystal panel assembly is accommodated in a predetermined container together with the backlight assembly and various optical sheets to form a liquid crystal display device.

In the case of the conventional liquid crystal display device, in particular, in the case of small and medium-sized liquid crystal display device, there is a limitation to be thin, small, and light due to the use characteristics of the final product. To meet these limitations, double-sided tape is often used to assemble each part. If assembled incorrectly using these double-sided tape, reassembly is difficult, and once the double-sided tape is attached to the parts may need to be discarded. In addition, the step of assembling a double-sided tape with respect to a narrow area decreases the efficiency of the coarse particle and reduces the production efficiency.

That is, in the case of performing the assembly work using the double-sided tape, the material cost is increased due to the addition of parts due to the misoperation, and the productivity decrease due to the decrease in the assembly efficiency.

An object of the present invention is to provide a liquid crystal display device having a structure that can increase the efficiency of the assembly operation.

Technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel assembly displaying image information; a backlight unit providing light to the liquid crystal panel assembly; and sidewalls along edges of an upper surface thereof. And an upper accommodating container accommodating the liquid crystal panel assembly and the backlight unit in the sidewalls, and at least one protrusion for applying pressure to the backlight unit is formed on a bottom surface thereof and covers the lower surface of the backlight unit. It includes a lower receiving container for coupling.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

The liquid crystal display device used in the present invention includes a portable multimedia player (PMP), a personal digital assistant (PDA), a portable digital player (DVD) player, a cellular phone, and the like. Hereinafter, the liquid crystal display device of the present invention will be described using a mobile phone for convenience of explanation. However, the present invention is not limited thereto and includes the aforementioned liquid crystal display devices.

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

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

Referring to FIG. 1, the liquid crystal display device 100 according to the present invention generally has a liquid crystal panel assembly 130, a backlight unit, an upper storage container 140 accommodating the liquid crystal panel assembly 130 and a backlight unit, and an upper portion. It includes a lower storage container 170 coupled to the storage container 140.

Here, the liquid crystal panel assembly 130 includes a TFT substrate 133, a liquid crystal panel 135 including a color filter substrate 134, a liquid crystal (not shown), a driving IC 131, a flexible printed circuit board 110, and the like. It consists of.

The liquid crystal panel 135 is a device for displaying image information such as letters, numbers, and arbitrary icons by adjusting the transmittance of light passing through a liquid crystal layer (not shown) according to the intensity of the applied voltage. It includes a color filter substrate 134 and a liquid crystal (not shown).

The TFT substrate 133 includes a plurality of gate lines, data lines, and pixel electrodes. The gate lines extend in the row direction to carry the gate signal, and the data lines extend in the column direction and carry the data signal. The pixel is connected to the gate line and the data line and includes a switching element and a storage capacitor.

Here, the switching element is formed at the intersection of the gate line and the data line, and the sustain capacitor and the liquid crystal capacitor are connected to the output terminal of the switching element. In addition, the switching element is implemented as a thin film transistor having amorphous silicon and poly-silicon as a channel layer.

The other terminal of the holding capacitor is connected to a common voltage or to a gate line immediately above. Here, the former connection method is called a separate wire type, and the latter connection method is called a front gate type.

The color filter substrate 134 is disposed on the TFT substrate 133 and includes a red, green, or blue color filter in a region corresponding to the pixel electrode so that colors can be displayed for each pixel. The color filter may be formed above or below the pixel electrode. In addition, a common electrode made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) is formed on the color filter.

The liquid crystal layer (not shown) is filled between the color filter substrate 134 and the TFT substrate 133 and has dielectric anisotropy. The liquid crystal layer (not shown) has a thickness of about 5 μm and has a twisted nematic (TN) arrangement. The liquid crystal layer (not shown) adjusts the transmittance of light passing through the liquid crystal layer (not shown) by changing the arrangement direction by a voltage applied from the outside.

Meanwhile, the TFT substrate 133, the color filter substrate 134, and the liquid crystal layer (not shown) constituting the liquid crystal panel 135 constitute a liquid crystal capacitor, and the liquid crystal capacitor configured as described above has a common voltage with the output terminal of the switching element. Or a reference voltage.

The driving IC 131 receives a gate control signal, a data control signal, a data signal related thereto, and the like from a printed circuit board (not shown) through an input terminal, and transmits the gate driving signal and the data driving signal through a TFT substrate (the output terminal). And an integrated circuit for providing to the gate line and the data line formed on the 133, respectively. As a result, a desired image may be implemented on the liquid crystal panel 135.

Such a driving IC 131 is mounted on a TFT substrate 133 other than an image display area corresponding to the color filter substrate 134 of the TFT substrate 133, and at this time, a gate whose output terminal extends from the image display area. It is mounted by a COG (chip on glass) method or the like so as to be connected to a line and a data line respectively. Accordingly, as described above, the gate drive signal and the data drive signal generated by the driver IC 131 are transferred to each pixel formed in the image display area of the TFT substrate 133.

Flexible printed circuit board (FPCB) 110 is a type of printed circuit board (PCB) that connects or supports various electronic components according to the circuit design of the electrical wiring to the printed circuit board (PCB) 110. Unlike conventional printed circuit boards, they are flexible. Such a flexible printed circuit board 110 generally includes a metal thin film pattern such that a base film, a terminal region in which metal thin plate patterns are arranged as lead terminals at both ends of the base film, and a terminal region arranged in both ends of the base film are connected to each other. It is formed as this electrical wiring and includes an interface region in which a coverlay for protecting and insulating the electrical wiring is formed. In addition, a plurality of through holes may be formed in the interface region, and the electronic component mounted through the plurality of through holes may further include a region in which a predetermined electronic circuit is formed by being connected to an electrical wire.

One end of the flexible printed circuit board 110 formed as described above is connected to a printed circuit board (not shown), and the other end thereof is connected to an input terminal of the driving IC 131. Accordingly, the gate driving signal, the data driving signal, and the related data signal are transmitted from the printed circuit board to the driving IC 131.

In addition, the backlight unit according to the exemplary embodiment of the present invention includes the optical sheets 141, the lamp assembly 143, the light guide plate 142, and the reflective sheet 146.

Here, the light guide plate 142 serves to guide the light emitted from the lamp assembly 143. The light guide plate 142 is formed of a panel of a plastic-based transparent material such as acryl to propagate light generated from the lamp assembly 143 toward the liquid crystal panel 135 seated on the light guide plate 142. Therefore, various patterns for converting the traveling direction of the light incident into the light guide plate 142 toward the liquid crystal panel 135 may be printed on the rear surface of the light guide plate 142.

The lamp assembly 143 is inserted into one side of the light guide plate 142 in the upper receiving container 140. As the lamp used in the lamp assembly 143, a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), an external electrofluorescent lamp (EEFL), or the like may be used.

The reflective sheet 146 is installed on the lower surface of the light guide plate 142 to reflect the light emitted to the bottom of the light guide plate 142 to the top. The reflective sheet 146 is disposed on the lower surface of the light guide plate 142, and reflects the light not reflected by the minute dot pattern on the rear surface of the light guide plate 142 back toward the exit surface of the light guide plate 142, thereby allowing the liquid crystal panel 135 to be disposed. At the same time, it reduces the light loss of the light incident on the light guide plate and improves the uniformity of the light transmitted to the exit surface of the light guide plate 142.

The optical sheets 141 are mounted on the upper surface of the light guide plate 142 to diffuse and collect light transmitted from the light guide plate 142. The optical sheets 141 include a diffusion sheet, a prism sheet, a protective sheet, and the like.

A diffusion sheet located between the light guide plate 142 and the prism sheet disperses the light incident from the light guide plate 142 to prevent the light from being partially concentrated. The prism sheet has a triangular prism with a regular arrangement on the upper surface, and is usually composed of two sheets, and each prism array is arranged so as to cross each other at a predetermined angle, so that the light diffused from the diffusion sheet is a liquid crystal panel. Concentrates in the direction perpendicular to (135). As a result, the light passing through the prism sheet almost runs vertically so that the luminance distribution on the protective sheet is uniformly obtained. The protective sheet formed on the prism sheet not only serves to protect the surface of the prism sheet, but also serves to diffuse light in order to make the distribution of light uniform. In addition, a black line (not shown) may be formed along the edge of the protective sheet to prevent bright lines or light leakage generated at the edge of the display area of the liquid crystal panel 135.

Here, in the case of the small liquid crystal display device 100, one lamp is usually installed on the side of the light guide plate 142, but as the liquid crystal display device 100 becomes larger, a plurality of lamps may be provided in one lamp assembly 143 to obtain sufficient luminance. Lamps can be installed.

The liquid crystal panel assembly 130 is installed on the optical sheets 141 and is mounted in the light guide plate 142 together with the optical sheets 141.

The upper accommodating container 140 has sidewalls formed along edges of the rectangular opening, and predetermined locking protrusions are formed in the sidewalls to accommodate and fix the liquid crystal panel assembly 130 and the backlight unit. Prevent the sheets from bending. In addition, the flexible printed circuit board 110 of the liquid crystal panel assembly 130 is bent around one side wall of the upper storage container 140. Here, the shape of the upper storage container 140 may be variously modified according to a method of accommodating the backlight unit or the liquid crystal panel assembly 130 in the upper storage container 140.

The upper receiving container 140 may be hooked with the lower receiving container 160. For example, a hook 145 is formed along an outer surface of the side wall of the upper receiving container 140, and the hook 145 and A corresponding hook insertion hole 172 may be formed on the side of the lower receiving container 170. Therefore, the lower storage container 170 is coupled to the lower storage container 170 from the bottom of the upper storage container 140 so that the hook 145 formed in the upper storage container 140 enters the hook insertion hole 172 of the lower storage container 170. The upper receiving container 140 and the lower receiving container 170 may be fastened. The present invention is not limited thereto, and the position of the hook 145 may be located in the lower storage container 170 and the hook insertion hole 172 may be formed in the upper storage container 140. In addition, the combination of the upper receiving container 140 and the lower receiving container 170 may be modified in various forms.

The light guide plate 142 and the reflective sheet 146 accommodated in the upper storage container 140 are fixed by the lower storage container 170 which rises from the bottom of the upper storage container 140 and engages with the upper storage container 140. . In the case of the reflective sheet 146 accommodated by the upper storage container 140 and the lower storage container 170, if the reflective sheet 146 is not attached to the upper storage container 140 using double-sided tape, the reflective sheet 146 is stored in the stored state. It can move without being fixed, which can degrade the display characteristics of the display. In addition, in the case of fixing the reflective sheet 146 by using a double-sided tape, as described above, when assembling work, problems such as increase in material cost due to the addition of parts due to misworking and productivity decrease due to lowering assembly efficiency May occur.

The height of the protrusion 174 is preferably smaller than the thickness of the lower receiving container (170). When the height of the protrusion 174 is greater than the thickness of the lower receiving container 170, the backlight unit accommodated in the lower receiving container 170 may be deformed by the protrusion 174, and the upper receiving container 140 and the lower part may be deformed. Fastening of the storage container 170 may not be easy. For example, when the lower container 170 has a thickness of about 0.1 to 0.2 mm, the protrusion 174 preferably has a thickness of about 0.1 mm or less.

In the case of the lower storage container 170 illustrated in FIG. 1, the protrusion 174 is formed on one surface of the bottom surface that faces the reflective sheet 146. The protrusion 174 is fixed by applying pressure to the back of the backlight unit accommodated on the lower housing 170, so that the upper storage container 140 and the lower storage container 170 are assembled after the liquid crystal display device 100 is assembled. It is possible to prevent the backlight unit housed in the movement. As such, by forming the protrusion 174 on the bottom surface of the lower housing 170, the backlight unit may be accommodated and fixed without using an additional component (for example, a double-sided tape).

As described above, in the case of the lower storage container 170 according to the exemplary embodiment of FIG. 1, a backlight unit is disposed between the upper storage container 140 and the lower storage container 170 by using one protrusion 174. Although the case of fixing has been described, the present invention is not limited thereto. That is, the protrusion 174 may be formed in one or more, and may be disposed on two diagonal lines formed on the bottom surface of the lower receiving container 170.

2 to 5 are perspective views for explaining modifications of the lower housing 170 of the present invention.

Like the lower container 270 illustrated in FIG. 2, two protrusions 174 may be disposed in the long side direction on two diagonals of the bottom surface of the lower container 270. As shown in FIG. 3, the two protrusions 174 may be disposed in the short side direction on two diagonals of the bottom surface of the lower storage container 370. And, like the lower container 470 shown in FIG. 4, two protrusions 174 may be disposed on one diagonal of the bottom surface of the lower container 470. And, like the lower container 570 shown in FIG. 5, four protrusions 174 may be disposed at each corner of the bottom surface along two diagonals of the bottom surface of the lower storage container 570. As such, the protrusion of the present invention may be composed of one or more, and may be disposed in various forms on the bottom surface of the lower housing. However, if there are too many protrusions, since the shape of the stored backlight unit may be deformed, it is preferable to form the protrusions so as not to deform the shape of the backlight unit.

In the liquid crystal display according to the exemplary embodiment described above, a wedge type backlight assembly including a lamp assembly at one side of the light guide plate may be used as an example, and both sides of the light guide plate may have a flat plane. The same applies to the flat type backlight assembly having the lamp assembly in the part.

In addition, in the above-described embodiment of the present invention, an edge type backlight assembly having a lamp on the side of the light guide plate is described as an example, but a structure in which a plurality of lamps are arranged on the bottom surface without the light guide plate is provided. The same applies to the direct backlight assembly having the same.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

As described above, according to the liquid crystal display device according to the present invention, it is possible to provide a liquid crystal display device that can increase the efficiency of the assembly operation.

Claims (4)

A liquid crystal panel assembly displaying image information; A backlight unit providing light to the liquid crystal panel assembly; An upper storage container having a sidewall formed along an edge of an upper surface thereof to accommodate the liquid crystal panel assembly and the backlight unit in the sidewall; And At least one protrusion for applying pressure to the backlight unit is formed on the bottom surface, and the liquid crystal display device comprising a lower housing container covering the lower surface of the backlight unit and coupled to the upper housing container. According to claim 1, And one or more projections formed on a diagonal of the bottom surface of the lower housing. According to claim 1, The height of the projection is smaller than the thickness of the lower housing container. According to claim 1, The projection has a thickness of about 0.1 mm or less.

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