KR20030017253A - Liquid crystal display device - Google Patents

Abstract

Disclosed is a liquid crystal display device capable of reducing the overall size of a liquid crystal display device and improving the assemblability. Light from the lamp is guided to the display portion by the light guide plate, the lamp, the light guide plate and the display portion are received in the first and second storage containers which are coupled to face each other, and the first and second storage containers are stored in the rear and front cases. . In this case, the front case, the rear case, the second storage container, the front case, the rear case, the second storage container, and the first side wall of the first storage container, each of which is longer than the sidewall perpendicular to the lamp, overlaps the lamp. And first to fourth coupling holes penetrating through the first sidewalls of the first storage container, and screwed thereto. Therefore, the thinner and lighter liquid crystal monitor device can be achieved by minimizing the overall thickness of the liquid crystal display device, and the assemblability can be improved.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of reducing the overall size of the liquid crystal display device and improving the assemblability.

Recently, information processing devices have been rapidly developed to have various forms, various functions, and faster information processing speed. Information having an electrical signal form processed by such an information processing device requires a display device serving as an interface.

Recently, a liquid crystal display device has been developed, which is lighter, smaller, and has a function such as full-color, high resolution, and the like, compared to a CRT display device. In general, a liquid crystal display device applies a voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and changes in optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of the liquid crystal cell that emit light by the molecular array conversion. Is a display that displays an image by converting the image into visual change.

1 is an exploded perspective view schematically showing a conventional liquid crystal monitor device. FIG. 2 is a cross-sectional view showing a coupling structure of the liquid crystal monitor shown in FIG. 3 is a cross-sectional view illustrating in more detail a coupling structure of the LCD monitor illustrated in FIG. 2.

Referring to FIG. 1, the liquid crystal monitor apparatus 100 may include a liquid crystal display module 130 for receiving an image signal and a front case 110 and a rear case 120 for accommodating the liquid crystal display module 130. It consists of). The liquid crystal display module 130 includes a display unit 170 including a liquid crystal display panel for displaying a screen and a backlight assembly 150 for providing light to the display unit 170.

The display unit 170 includes a liquid crystal display panel 171, data and gate printed circuit boards 176 and 175, and data and gate tape carrier packages 178 and 174.

The liquid crystal display panel 171 includes a thin film transistor substrate 172, a color filter substrate 173, and a liquid crystal (not shown).

The thin film transistor substrate 172 is a transparent glass substrate on which a matrix thin film transistor is formed. Data and gate lines are respectively connected to the source and gate terminals of the thin film transistors, and a pixel electrode made of indium tin oxide (ITO), which is a transparent conductive material, is formed at the drain terminal.

The color filter substrate 173 is provided to face the thin film transistor substrate 172. The color filter substrate 173 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. The common electrode made of ITO is coated on the front surface of the color filter substrate 173.

When power is applied to the gate terminal and the source terminal of the transistor of the thin film transistor substrate 172 described above and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. Such an electric field changes the arrangement angle of the liquid crystal injected between the thin film transistor substrate 172 and the color filter substrate 173, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel. In addition, a driving signal and a timing signal are applied to the gate line and the data line of the thin film transistor in order to control when the liquid crystal display panel 171 is arranged with the alignment angle of the liquid crystal.

A backlight assembly 150 is provided below the display unit 170 to provide uniform light to the display unit 170. The backlight assembly 150 is provided at both ends of the liquid crystal display module 130 to provide lamp units 161 and 162 for generating light, and a light guide plate for guiding the light toward the display unit 170 to change a path of light. 152, a plurality of optical sheets 153 for uniforming the luminance of light emitted from the light guide plate 152, and light leaking from the light guide plate 152 under the light guide plate 152 to the light guide plate 152. Reflecting plate 154 is included to increase the efficiency of light.

The display unit 171 and the backlight assembly 150 are sequentially received in the mold frame 132 which is a storage container, the mold frame 132 is stored in the bottom chassis 134, and the display unit 171 is The top chassis 140 is provided to be coupled to the bottom chassis 134 to prevent it from being separated. 2 and 3, since the side wall of the top chassis 140 is formed longer than the side wall of the bottom chassis 134, the height of the bottom chassis 134 is increased by the height of the reference numeral “H 2”. Extending downwards.

Next, a shield case 138 is installed on a rear surface of the bottom chassis 134 to shield electric wave from an inverter circuit (not shown) that provides power to the display unit 170. The bracket 136 corresponding to the extended side wall of the top chassis 140 is accommodated on the bottom of the bottom chassis 134, and then the front case 110 and the rear case 120 are coupled to face each other. Complete the liquid crystal monitor device.

In this case, a plurality of coupling holes 137a, 137b, 137c, and 137d corresponding to each other are formed on sidewalls of the bracket 136, the top chassis 140, the front case 110, and the rear case 120. The front and rear cases 110 and 120 are coupled to the liquid crystal display module by a plurality of screws 139a, 139b, 139c, and 139d respectively coupled to the coupling holes 137a, 137b, 137c, and 137d. At this time, the side wall of the bracket 136 has a burring (A) for firmly fastening a plurality of screws (139a, 139b, 139c, 139d) passing through the plurality of coupling holes (137a, 137b, 137c, 137d), respectively. Is formed.

However, the following problems arise in such a liquid crystal monitor device.

First, the height of the liquid crystal monitor device, that is, the thickness H1 is increased by the sidewall height H2 of the bracket 133 employed to form the burring A, so that the overall thickness of the liquid crystal monitor device is greatly increased. do.

Second, as illustrated in FIG. 4, sidewalls of the plurality of coupling holes 137a, 137b, 137c, and 137d that are perpendicular to the lamp units 161 and 162, that is, both sides of the short length of the front case 110 are short. Is formed on the wall. For this reason, as the size of the liquid crystal display panel 171 increases, it becomes difficult to maintain a firm assembly state of the liquid crystal monitor device.

SUMMARY OF THE INVENTION The present invention proposed to solve the above problems has an object of providing a liquid crystal display device which can reduce the overall size of the liquid crystal monitor device and improve the assemblability.

1 is an exploded perspective view schematically showing a conventional liquid crystal display device.

FIG. 2 is a cross-sectional view illustrating a coupling structure of the liquid crystal display shown in FIG. 1.

3 is a partially enlarged cross-sectional view illustrating a case coupling structure of the liquid crystal display shown in FIG. 2.

4 is a plan view of the liquid crystal display shown in FIG. 2.

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

6 is a cross-sectional view illustrating a coupling structure of the liquid crystal display shown in FIG. 5.

FIG. 7 is a cross-sectional view illustrating a case coupling structure of the LCD shown in FIG. 6.

FIG. 8 is a cross-sectional view illustrating another coupling structure of the liquid crystal display shown in FIG. 5.

9 is a cross-sectional view illustrating another coupling structure of the liquid crystal display shown in FIG. 5.

FIG. 10 is a plan view of the liquid crystal display shown in FIG. 7.

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

210: front case 220: rear case

232: mold frame 254: reflector

252: light guide plate 253: optical sheet

270: display unit 240: top chassis

According to an aspect of the present invention, there is provided a liquid crystal display device including: a lamp for generating light, a light guide plate for guiding the light to a display unit for displaying an image, and a first storage container for accommodating the lamp and the light guide plate. A second storage container coupled to the first storage container to guide the position of the display unit, a front case coupled to the front surface of the second storage container, and opposite the front case to the rear surface of the storage container; And a rear case to be coupled.

The front case, the rear case, the second storage container, and the first side wall of the front case, the rear case, the second storage container, and the first storage container having a length longer than the sidewall perpendicular to the lamp, overlap the lamp. First to fourth coupling holes are formed to penetrate through the first side walls of the first storage container.

The first storage container includes a bottom chassis for accommodating the lamp and the light guide plate and a shield case installed on a rear surface of the bottom chassis to block electromagnetic waves from the display unit, and the fourth coupling hole is provided in the shield case. Is formed.

Burring is formed from the fourth coupling hole formed in the first side wall of the shield case to the lamp side to improve the fastening force of the screw inserted through the first to fourth coupling holes.

According to such a liquid crystal display device, coupling holes for coupling the front and rear cases to the liquid crystal display module are formed on the long side as well as the short side of the liquid crystal display device. Thus, thinner and lighter liquid crystals are minimized by minimizing the overall thickness of the liquid crystal display device. A monitor apparatus can be achieved and assembly property can be improved.

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

Referring to FIG. 5, the liquid crystal display 200 may include a liquid crystal display module 230 for receiving an image signal and a front case 210 and a rear case 220 for accommodating the liquid crystal display module 230. It includes a case consisting of

The liquid crystal display module 230 includes a display unit 270 including a liquid crystal display panel representing a screen, and a backlight assembly 250 for providing light to the display unit 270. In addition, the storage container may include a mold frame 232 for accommodating the display unit 270 and the backlight assembly 250 and a bottom chassis 234 for accommodating and supporting the mold frame 232.

An inverter board (not shown) for providing power and an A / D board (not shown) for converting the image signal are installed on the bottom of the bottom chassis 234, and they are shield cases 238 for blocking electromagnetic waves. Is accommodated by).

The display unit 270 includes a liquid crystal display panel 271, a panel driving data printed circuit board and a gate printed circuit board 276 and 275, and data and gate tape carrier packages 278 and 274.

The liquid crystal display panel 271 includes a thin film transistor substrate 272, a color filter substrate 273, and a liquid crystal (not shown).

The thin film transistor substrate 272 is a transparent glass substrate on which a matrix thin film transistor is formed. A data line is connected to a source terminal of the thin film transistors, and a gate line is connected to a gate terminal of the thin film transistors. In addition, a pixel electrode made of indium tin oxide (ITO), which is a transparent conductive material, is formed in the drain terminal.

When electrical signals are input to the data lines and the gate lines, electrical signals are input to the source and gate terminals of the respective thin film transistors, and the thin film transistors are turned on or turned off according to the input of the electrical signals, thereby draining the drain terminals. The furnace outputs an electrical signal necessary for pixel formation.

The color filter substrate 273 is provided to face the thin film transistor substrate 272. The color filter substrate 273 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. The common electrode made of ITO is coated on the front surface of the color filter substrate 273.

When power is applied to the gate terminal and the source terminal of the transistor of the thin film transistor substrate 272 described above and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. By such an electric field, the arrangement angle of the liquid crystal injected between the thin film transistor substrate 272 and the color filter substrate 273 is changed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel.

A driving signal and a timing signal are applied to the gate line and the data line of the thin film transistor in order to control the arrangement angle of the liquid crystals and the timing when the liquid crystals are arranged in the liquid crystal display panel 271.

As shown, a data tape carrier package 278, which is a type of flexible circuit board for determining the timing of applying the data driving signal, is attached to the source side of the liquid crystal display panel 271, and the gate driving signal is applied to the gate side. Gate tape carrier package 274 is attached to determine timing.

The data printed circuit board 276 for receiving an image signal from the outside of the liquid crystal display panel 271 and applying a driving signal to the gate line and the data line, respectively, is a data tape carrier package on the data line side of the liquid crystal display panel 271. 278 is connected, and the gate printed circuit board 275 is connected to the gate tape carrier package 274 on the gate line side of the liquid crystal display panel 271.

A backlight assembly 250 is provided below the display unit 270 to provide uniform light to the display unit 270. The backlight assembly 250 includes first and second lamp units 261 and 262 for generating light, and a plurality of lamps are mounted in the first and second lamp units 261 and 262, respectively.

The light guide plate 252 has a size corresponding to that of the liquid crystal display panel 271 of the display unit 270 and is located below the liquid crystal display panel 271 to be generated from the first and second lamp units 261 and 262. The light path is changed while guiding the light to the display unit 270.

A plurality of optical sheets 253 are provided on the light guide plate 252 to uniform the luminance of light emitted from the light guide plate 252 and directed toward the liquid crystal display panel 271. In addition, a reflector plate 254 is provided under the light guide plate 252 to reflect light leaked from the light guide plate 252 to the light guide plate 252 to increase light efficiency.

The display unit 270 and the backlight assembly 250 are accommodated in a mold frame 232 that is a storage container, and the mold frame 232 is supported by the bottom chassis 234. The mold frame 600 has a shape in which a bottom surface is opened, and an area where the data printed circuit board 276 is bent and mounted is partially opened to smoothly receive circuit components.

An inverter board and an A / D board (not shown) face directly to the bottom of the bottom chassis 234.

In addition, the display unit 270 prevents the display unit 270 from being separated from the bottom chassis 300 while bending the data printed circuit board 276 to the outside of the bottom chassis 234. Top chassis 240 is provided.

FIG. 6 is a cross-sectional view illustrating a coupling structure of the LCD monitor illustrated in FIG. 5, and FIG. 7 is a cross-sectional view illustrating a structure in which a case is coupled to the LCD monitor illustrated in FIG. 6.

6 and 7, the reflective plate 254, the light guide plate 252, the optical sheet 253, and the display unit 270 are sequentially disposed in the storage space of the mold frame 232 and the bottom chassis 234. The first lamp unit 261 is received at an end of the light guide plate 252. The A / D board and the inverter board (not shown) are coupled to the bottom of the bottom chassis 232. In addition, a shield case 238 for blocking electromagnetic waves from the A / D board and the inverter board is coupled to the rear surface of the bottom chassis 232 to surround the A / D board and the inverter board. The top chassis 240 is coupled to guide the position of the display unit 270 to face the bottom chassis 234.

At this time, the side wall of the shield case 238 on the side of the first lamp unit 261 is between the side wall of the top chassis 240, that is, the side wall of the first lamp unit 261 and the top chassis 240. It extends toward the display unit 270 to be positioned. As shown, first and second coupling holes 238a and 240a are formed through the sidewalls of the top chassis 240 and the shield case 238 coupled to overlap each other. In addition, a burring 238b is formed in the first coupling hole 238a formed on the sidewall of the shield case 238 to protrude toward the first lamp unit 261. In addition, as shown in FIG. 7, the third and fourth coupling holes 210a and 220a also correspond to the first and second coupling holes 238a and 238b in the front and rear cases 210 and 220, respectively. Is formed.

Here, the first to fourth coupling holes 238a, 240a, 210a, and 220a formed at positions corresponding to each other are formed in plural and spaced apart by a predetermined distance, and are located between the data tape carrier packages 278. do. In other words, the plurality of data tape carrier packages 278 are bent at the first lamp unit 261 side to receive the data printed circuit board 276 shown in FIG. 5 on the bottom of the bottom chassis 234. It is a part. Therefore, the first to fourth coupling holes 238a, 240a, 210a, and 220a are formed between the plurality of data tape carrier packages 278 so as not to damage the data tape carrier package 278.

Next, the fourth coupling hole 220a of the rear case 220, the third coupling hole 210a of the front case 210, the second coupling hole 240a of the top chassis 240, and the shield case 238. When the screw (not shown) is fastened to sequentially penetrate the first coupling hole 238a to be coupled to the burring 238b, the LCD monitor device is completed.

In this case, although not shown in the drawing, the coupling holes are also formed on the sidewalls facing the sidewalls formed with the first to fourth coupling holes 238a, 240a, 210a, and 220a, and the sidewalls perpendicular to the screws to form the coupling holes. Can be fastened.

8 is a cross-sectional view showing another coupling structure of the LCD monitor according to the present invention shown in FIG.

In FIG. 8, the coupling structure of the backlight assembly 250, the display unit 270, the mold frame 232, and the bottom chassis 234 is the same as that of the liquid crystal monitor device shown in FIG. 6, and these same structures are the same. Components having the same reference numerals are denoted together.

Referring to FIG. 8, after storing the backlight assembly 250 and the display unit 270 in the storage space of the mold frame 232 and the bottom chassis 234, the first lamp unit 261 may be accommodated therein. Ribs 233 having a predetermined thickness are provided on the outer wall of the bottom chassis 234 on the side. That is, the rib 233 is positioned between the side wall of the top chassis 240 and the side wall of the bottom chassis 234 that are coupled to the bottom chassis 234 so as to guide the position of the display unit 270. do. A fifth coupling hole 233a is formed in the rib 233 to correspond to the second coupling hole 240a formed in the top chassis 240.

In addition, the fourth coupling hole 220a of the rear case 220, the third coupling hole 210a of the front case 210, and the top chassis are formed on the inner wall of the fifth coupling hole 233a in a subsequent assembly step. Insert nut (233b) to improve the fastening force of the screw (not shown) inserted through the second coupling hole 240a of the 240 and the fifth coupling hole 233a of the rib 233 sequentially. Is inserted. In addition, a shield case 238 is installed on the bottom of the bottom chassis 234 to perform the same function as the shield case shown in FIG. 6.

Similarly, the front case 210 is coupled at the top chassis 240 side, and the rear case 220 is coupled at the shield case 238 side. As described above, fourth and third coupling holes 220a and 210a are formed in the rear and front cases 220 and 210, respectively, and the front and rear cases 210 and 220 are the fourth and third holes, respectively. And a screw (not shown) sequentially passing through the second and fifth coupling holes 220a, 210a, 240a, and 233a and the insert nut 233b to be coupled to the liquid crystal display module.

In addition, although only the side of the first lamp unit 261 in which the data tape carrier package 278 shown in FIG. 5 is bent is described, a rib having the same structure as the rib 233 is formed in the second portion. In addition, the third, fourth and fifth coupling holes 240a, 210a, 220a, and 233a may be inserted into sidewalls facing the sidewalls formed thereon and orthogonal to these sidewalls to fasten screws (not shown). In addition, the second, third, fourth, and fifth coupling holes 240a, 210a, 220a, and 233a formed at positions corresponding to each other may be formed in plural, spaced apart by a predetermined distance, and the data tape carrier package 278. Located between).

FIG. 9 is a cross-sectional view illustrating another coupling structure of the LCD monitor illustrated in FIG. 5.

In FIG. 9, the coupling structure of the backlight assembly 250, the display unit 270, the mold frame 232, and the bottom chassis 234 is the same as that of the liquid crystal monitor device shown in FIG. 6, and these same structures are the same. Components having the same reference numerals are denoted together.

Referring to FIG. 9, the backlight assembly 250 and the display unit 270 are accommodated in the storage space of the mold frame 232 and the bottom chassis 234, and the display unit faces the bottom chassis 234. Coupling the top chassis 240 for guiding the position of the (270). A shield case 238 is installed on the bottom of the bottom chassis 234 to perform the same function as the shield case shown in FIG. 6.

On the other hand, an embossing 238a is formed on the sidewall of the bottom chassis 234 on the side where the first lamp unit 261 is accommodated to protrude to a predetermined height in the sidewall direction of the top chassis 240. In addition, a sixth coupling hole 238c is formed at a central portion of the embossing 238a to correspond to the second coupling hole 240a formed on the sidewall of the top chassis 240, and the sixth coupling hole 238c. A burring 238b is formed from the side toward the first lamp unit 261.

Similarly, the front case 210 is coupled at the top chassis 240 side, and the rear case 220 is coupled at the shield case 238 side. As described above, fourth and third coupling holes 220a and 210a are formed in the rear and front cases 220 and 210, respectively, and the front and rear cases 210 and 220 are the fourth and third holes, respectively. And the liquid crystal display by fastening a screw (not shown) sequentially passing through the second and sixth coupling holes 220a, 210a, 240a, and 238c and a burring 238b formed in the sixth coupling hole 238c. Coupled to the module.

Incidentally, only the first lamp unit 261 side where the data tape carrier package 278 shown in FIG. 5 is bent has been described. However, as described above, an embossing 238a is formed on the sidewall of the bottom chassis 234, and a burring 238b is formed inside the embossing 238a to screw (not shown). The same applies to the sidewalls facing the sidewalls on which the third, fourth and sixth coupling holes 240a, 210a, 220a, and 238a are formed, and the sidewalls perpendicular to the sidewalls. In addition, the second, third, fourth, and sixth coupling holes 240a, 210a, 220a, and 238a formed at positions corresponding to each other may be formed in plural, spaced apart by a predetermined distance, and the data tape carrier package 278. Located between).

FIG. 10 is a plan view illustrating a coupling structure of the LCD monitor illustrated in FIG. 7.

Referring to FIG. 10, coupling holes 241a, 241b, 241c, 242a, 242b and 242c are formed in the long side as well as the short side of the liquid crystal display. That is, a plurality of coupling holes 240a, 240b, 240c, and 240d are formed at ends of the first and second lamp units 261 and 262 that are not accommodated, and the first and second lamp units 261, A plurality of coupling holes 241a, 241b, 241c, 242a, 242b, and 242c are also formed at a predetermined distance from an end at which the 262 is accommodated. Each of the coupling holes 240a, 240b, 240c, 240d, 241a, 241b, 241c, 242a, 242b, and 242c has screws 237a, 237b, 237c, 237d, 237e, 237f, 237g, 237h, as described above. 237i and 237j are respectively coupled to couple the front and rear cases 210 and 220 to the liquid crystal display module.

According to the liquid crystal display as described above, coupling holes for coupling the front and rear cases to the liquid crystal display module are formed on the long side as well as the short side of the liquid crystal display. In particular, the coupling hole formed on the long side where the lamp unit is accommodated is formed to be located between the data tape carrier packages. The screw penetrating the coupling hole formed in the front and rear cases is combined with a burring or insert nut formed on the side wall of the shield case, the side wall of the bottom chassis, or a separate rib to maintain a fastening force.

Therefore, the thinner and lighter liquid crystal monitor device can be achieved by minimizing the overall thickness of the liquid crystal display device, and the assemblability can be improved.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

Claims (9)

A lamp for generating light; Light guiding means for guiding the light to display means for displaying an image; First accommodating means for accommodating the lamp and the light guiding means; Second accommodating means for cooperating with the first accommodating means to guide the position of the display means; A front case coupled to the front surface of the second accommodating means; And A rear case coupled to the front case at a rear surface of the storage means; A first penetrating first sidewall of each of the front case, rear case, second receiving means, and first receiving means so as to overlap the lamp for coupling the front case, rear case, second receiving means, and first receiving means; Liquid crystal display device characterized in that the first to fourth coupling holes are formed. The liquid crystal display of claim 1, wherein each of the first sidewalls of the front case, the rear case, the second accommodating means, and the first accommodating means has a length longer than a sidewall orthogonal to the lamp and the first sidewall. The apparatus of claim 1, wherein the first accommodating means comprises: a bottom chassis for accommodating the lamp and the light guiding means; And a shield case disposed on a rear surface of the bottom chassis to block electromagnetic waves from the display means, wherein the fourth coupling hole is formed in the shield case. The method according to claim 3, wherein a burring is formed from the fourth coupling hole formed in the first sidewall of the shield case to the lamp side to improve the fastening force of the screw inserted through the first to fourth coupling holes. A liquid crystal display device characterized by the above-mentioned. The liquid crystal display of claim 1, wherein the first accommodating means is a bottom chassis in which an embossing is formed on the first sidewall, and the fourth coupling hole is formed through the embossing. The method of claim 5, wherein the burring is formed from the fourth coupling hole formed in the first side wall of the bottom chassis to the lamp side to improve the fastening force of the screw inserted through the first to fourth coupling holes. Liquid crystal display device. The apparatus of claim 1, wherein the first accommodating means comprises: a bottom chassis for accommodating the lamp and the light guiding means; And a mold frame for accommodating the bottom chassis, wherein the fourth coupling hole is formed in the mold frame. The liquid crystal display of claim 7, wherein a coupling nut is formed inside the fourth coupling hole to improve a fastening force of a screw inserted through the first to fourth coupling holes. 2. The front case, the rear case, and the second housing of claim 1, wherein the first to fourth coupling holes are disposed on the second sidewall facing the first sidewall and the third and fourth sidewalls orthogonal to the first sidewall. And a penetrating means and a first accommodating means, respectively.