CN1466003A - Liquid crystal display device - Google Patents

Abstract

In a liquid crystal display device, a frame, a liquid crystal panel, and a diffuser are provided, and the liquid crystal panel and the diffuser are supported by the frame made of white resin. The frame consists of two short side pieces and two long side pieces. The short side members have reflectors, respectively, and lamp mounting members made of rubber are mounted together with the reflectors to support the ends of the lamps. A lamp mounting part is mounted to the back reflector to secure the lamp to the back reflector.

Description

Liquid crystal display device

field of invention

The present invention relates to a liquid crystal display device having a straight backlight unit, especially a liquid crystal display device capable of reducing the number of used devices.

Background technique

Liquid crystal display devices are used to configure monitors in thin TV receivers, stand-alone displays, and monitors in notebook-sized personal computers. A conventional liquid crystal display is composed of a backlight unit, a liquid crystal panel, and a housing, wherein the panel allows the light projected from the backlight unit to selectively pass therethrough and form an image thereon, and the housing is used to accommodate the backlight components and LCD panels. As the backlight, there are edge backlight and direct backlight. The feature of the edge backlight is that a light source such as a cold cathode discharge tube is placed next to the backlight component, and the light emitted from the light source is guided to the liquid crystal panel through the light guide plate; while the straight backlight The characteristic of the invention is that the light source is placed on the opposite side of the liquid crystal panel. The straight backlight unit can improve the brightness of the liquid crystal panel compared with the edge backlight unit, and thus can be used to configure a monitor in a thin TV receiver of the high-definition type, for example.

A liquid crystal panel refers to a panel that includes a transparent substrate having a switching element such as a TFT (Thin Film Transistor), a transparent counter substrate opposite to the transparent substrate, and a liquid crystal sealed between the two substrates, the liquid crystal display Some are arranged in a matrix, wherein a plurality of drivers are respectively connected to a scanning line and a signal line in each liquid crystal display device part, and a connection substrate is connected to each driver. The backlight unit refers to a light source, a holder for holding the light source, a reflector for reflecting light emitted from the light source toward the liquid crystal panel, and a diffuser for diffusing the light.

For example, in Japanese Patent Application Laid-Open No. 2000-75273, a liquid crystal display device incorporating a straight backlight unit is disclosed. Fig. 1 is an exploded view showing the structure of a conventional liquid crystal display device according to the technique disclosed in the above-mentioned '273 publication as well as other known techniques. As shown in FIG. 1, a conventional liquid crystal display device is provided with a frame 21 having an L-shaped cross section, and a liquid crystal display panel 22 placed surrounded by the frame 21 . The liquid crystal display panel 22 is composed of a display part 22a that selectively transmits light and generates colors to form an image, and a connection substrate 22b that controls the operation of the display part 22a. The sides of the display member 22 a and the connection substrate 22 b are in contact with the inner surface of the frame 21 . The connection substrate 22b is bent along the inner surface of the frame 21 at approximately right angles from the display part 22a. That is, the frame 21 covers one side of the display part 22a in the liquid crystal panel 22, and also covers the connection substrate 22b.

In addition, the diffuser 25 is provided on the side of the liquid crystal substrate 22 not covered by the frame 21 when viewed from the display part 22a. The diffuser 25 is a white translucent plate made of, for example, acrylic resin, and is placed in parallel with the display part 22a of the liquid crystal panel 22 . Hereinafter, the direction from the diffuser 25 toward the display part 22a of the liquid crystal panel 22 is designated as the surface direction, and the direction from the display part 22a toward the diffuser 25 is designated as the back direction. Frame 21, liquid crystal panel 22, and diffuser 25 are generally rectangular when viewed in the direction of the surface.

Side portions of the diffuser 25 are supported by a frame-shaped metal base 26 . A frame-shaped spacer 23 made of resin is located between the metal base 26 and the display part 22 a of the liquid crystal panel 22 . The gasket 23 is used to prevent the metal base 26 from contacting the liquid crystal panel 22 made of glass, thereby preventing the liquid crystal panel 22 from being damaged. Positioning members 27 made of resin are attached to the four surface corners of the metal base 26, respectively. The positioning component 27 is used for positioning and fixing the liquid crystal panel 22 . Between the metal base 26 and the connection substrate 22b of the liquid crystal substrate 22, an insulating member (not shown) is arranged to prevent a short circuit between the two substrates.

A back mirror 28 is located on the back of the diffuser 25 . The back reflector 28 can be flat or corrugated. Both the central portion of the back mirror 28 and its surrounding portion are generally parallel to the diffuser 25 . In the back mirror 28, two side portions 28a opposed to each other are bent toward the surface side at an angle larger than 0□ and smaller than 90□ with respect to the center and the vicinity of the back mirror 28 . Between the other two side portions other than the side portion 28 a of the back mirror 28 and the diffuser 25 , side reflectors 29 are placed, respectively. Each of the side reflectors 29 is comb-shaped and has a plurality of notched portions 29a formed thereon.

Between the diffuser 25 and the back reflector 28, several lamps 30 are arranged parallel to each other. Both ends of the lamp 30 are supported by the recessed portion 29a of the side reflector 29 . That is, the lamp 30 is arranged parallel to the side portion 28 a of the back reflector 28 and is surrounded by the side portion 28 a of the back reflector 28 and the side reflector 29 . Where the back reflector 28 is corrugated, the lamps 30 are located in the troughs of the corrugations. In addition, the back mirror 28 and the side reflector 29 are housed and supported in the resin frame 31 .

In Japanese Patent Application Laid-Open No. Hei 11-2813, a technique related to a liquid crystal display device having a straight backlight unit is disclosed, in which semi-cylindrical reflectors are provided for linear light sources (not shown), respectively, The linear light source and the reflector are integral with each other, made to slide along the sides and detachable relative to the frame. The reflectors serve as back mirror 28 and side reflectors 29 shown in FIG. 1 . According to the structure described therein, the brightness of the backlight unit becomes uniform, and the replacement of the linear light source is easy.

Furthermore, in Japanese Patent Application Laid-Open No. Hei 11-146305, a technique related to a liquid crystal display device is disclosed, in which a frame supporting a liquid crystal panel, a diffuser, and a backlight unit are provided, the frame being Consists of two vertical frames, two horizontal frames, and four corner parts. According to the structure described therein, even if the liquid crystal display device is large in size, the cost of the frame can be suppressed by suppressing an increase in the size of a molding machine for manufacturing the frame and an increase in the size of a mold used therein.

However, the above-mentioned conventional liquid crystal display device has the following problems. First, the cost of liquid crystal display devices is high compared to displays using cathode ray tubes. Therefore, for liquid crystal display devices, cost reduction is an urgent task. In addition, there is currently a need to reduce the size of the liquid crystal display device and increase the size of the display area. In order to satisfy this requirement, the area of the image frame surrounding the image display portion, which is not used for displaying images, must be made as narrow as possible.

In the aforementioned Japanese Patent Laid-Open No. 2000-75273, a liquid crystal display device is disclosed which is limited in reducing the cost of the picture frame and narrowing the picture frame because the number of devices used therein is very large, including Metal base 26 and positioning component 27 . Also, in the aforementioned Japanese Patent Application Laid-Open No. Hei 11-2813, a liquid crystal display device is disclosed, which also has a problem in that the cost increases because a plurality of reflectors are respectively provided for a plurality of linear light sources. Furthermore, in the aforementioned Japanese Patent Laid-Open No. Hei 11-146305, a liquid crystal display device is disclosed which makes it possible to suppress an increase in the size of a molding machine for manufacturing a frame, and an increase in the size of a mold used therein, but There is also a limit in cost reduction due to the large number of devices constituting the frame.

Summary of the invention

An object of the present invention is to provide a liquid crystal display device which is low in cost and has a narrower picture frame area as compared with conventional liquid crystal display devices.

A liquid crystal display device according to the present invention comprises several light sources, a back reflector, a diffuser, a liquid crystal panel and a frame; The mirrors are opposite, and the light source is located between them, which is used to transmit and diffuse the light emitted from the light source; the liquid crystal panel selectively transmits the light that has passed through the diffuser to form an image; and the diffuser supporting part And a liquid crystal panel supporting portion is provided as an integral frame, a diffuser supporting portion for supporting a diffuser, and a liquid crystal panel supporting portion for supporting a liquid crystal panel.

In the present invention, since the frame provided is provided with both the diffuser supporting portion for supporting the edge portion of the diffuser and the liquid crystal panel supporting portion for supporting the edge portion of the liquid crystal panel, it is possible to omit Positioner, metal base, and resin frame of the necessary parts. Therefore, it is possible to use a smaller number of devices than in a conventional liquid crystal display device, whereby the process of assembling the liquid crystal display device can be reduced, and therefore, it is possible to reduce the cost of the liquid crystal display device. In addition, since the metal base is omitted, it is possible to narrow the picture frame.

Preferably, the light source is separately mounted on each back reflector, and both ends thereof can be detached by mounting parts made of elastic material. In this case, since the light source is installed on the back reflector, when it is necessary to replace the light source in the liquid crystal display device, all the light sources can be replaced at one time by removing the back reflector. Therefore, the efficiency of the light source replacement work is improved. In addition to this, it is possible to dampen vibrations and shocks applied to the light source from the outside, thereby preventing damage to the light source.

On the other hand, a liquid crystal display device is disclosed in the aforementioned Japanese Patent Application Publication No. 2000-75273. When the lamp 30 (linear light source) needs to be replaced, as shown in FIG. Frame 31, back reflector 28, side reflector 29, lamp 30, diffuser 25, metal base 26 and the whole structure of positioning piece 27, after that, remove metal base 26 and diffuser 25 from the whole structure, and then Afterwards, the lamp 30 is removed. Thus, when replacing the lamp, it takes a lot of time and labor.

In the aforementioned Japanese Patent Application Laid-Open No. Hei 11-2813, a technique for facilitating lamp replacement is disclosed. However, the technique disclosed therein is only suitable for replacing lamps one by one. However, as the working time of the lamp goes on, the brightness of the lamp decreases, so if only one lamp is replaced in the liquid crystal display device, only this new lamp becomes brighter than the other lamps, causing the brightness of the screen to become uneven . Therefore, generally, as soon as one lamp fails, all lamps are replaced together. A liquid crystal display is disclosed in the aforementioned Japanese Patent Application Laid-Open No. Hei 11-2813. When all the lamps need to be replaced at one time, the lamps need to be taken out and replaced one by one, which makes lamp replacement very troublesome. On the other hand, in the present invention, all the light sources (lamps) can be replaced at one time by removing the back reflector, so that the light sources can be replaced efficiently.

The frame may have a side reflector for reflecting light emitted from the light source toward the liquid crystal panel. The side reflectors may be provided along the inner surface of the frame, that is, along the inner surface of the liquid crystal display device. With this structure, it is possible to omit the use of such separate side reflectors, which are essential components in conventional liquid crystal display devices.

The frames can be assembled into a frame shape by connecting at least two separate frames. The frame can be separated at the four corners, and by connecting four substantially linear, separated frames, it can be assembled into a single frame. Fitting the diffuser and back reflector into the frame is much easier in this case. In addition to this, it is also possible to reduce the size of the mold used to manufacture the frame, thus making it possible to reduce the cost of the liquid crystal display device.

Preferably, the separate frames may also be formed by molding resin, or by resin-coated metal. Therefore, not only the molding of the separate frame is facilitated, but also it is possible to omit the gasket used in the conventional liquid crystal display device for protecting the liquid crystal panel made of glass. As a result, it is possible to further reduce the number of components used, and to suppress the cost to a large extent.

In addition, the back reflector may comprise a metal plate and a reflective material coated on the metal plate to form a reflective surface. As a result, it is possible to diffuse and reflect light, and thus it is possible to provide a back reflector which is thin and high in strength. Here the reflective material as described above can be used, for example, a resin of a color exhibiting reflective effect, for example, a white resin.

Thus, according to the present invention, it is possible to provide a liquid crystal display device which is less expensive and has a narrower picture frame than conventional liquid crystal display devices.

Brief description of the drawings

Fig. 1 is an exploded view showing the structure of a conventional liquid crystal display device;

Fig. 2 is an exploded view showing the structure of a liquid crystal display device according to an embodiment of the present invention;

Fig. 3 is a perspective view showing the structure of a backlight used in a liquid crystal display device;

Fig. 4 is a perspective view showing the structure of a short-side member used in a liquid crystal display device;

Figures 5A to 5D are a set of plan views showing the structure of the short side parts, Figure 5A is a side view, Figure 5B is a top view, Figure 5C is a side view at right angles to Figure 5A, Figure 5D is a side view opposite to Figure 5A side view of

Fig. 6 is a perspective view showing the structure of a long side member used in a liquid crystal display device.

Figures 7A to 7D are a set of plan views showing the structure of the long side parts, Figure 7A is a side view, Figure 7B is a top view, Figure 7C is a side view at right angles to Figure 7A, Figure 7D is a side view opposite to Figure 7A side view of

Fig. 8 is a perspective view showing the structure of the connecting portion between the short side parts and the long side parts and the surrounding parts; and

Fig. 9 is a perspective view showing the structure of a back reflector, a lamp mounting member and a lamp used in a liquid crystal display device.

Detailed Description of the Preferred Embodiment

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. Now, a first embodiment of the present invention will be described. Fig. 2 is an exploded view showing the structure of the liquid crystal display device according to this embodiment. As shown in FIG. 2, in this embodiment of the liquid crystal display device, a frame 1 having an L-shaped cross section and a liquid crystal panel 2 are provided. The liquid crystal panel 2 is composed of a display part 2a which selectively transmits light and generates colors to form an image, and a connection substrate 2b which is connected to both sides of the display part 2a. adjacent sides, and control the operation of the display section 2a. The display portion 2a is composed of two glass substrates and a polarizer attached to the outside thereof. The display portion 2a and the connection substrate 2b are housed inside the frame 1, and the connection substrate 2b is bent out from the display portion at approximately a right angle. That is, the side surface portion on one side of the display portion 2a, together with the connection substrate 2b, is covered by the frame 1 having an L-shaped cross section.

In addition, a diffuser 5 is provided on the side where the side portion of the liquid crystal panel 2 is not covered by the frame 1 when viewed from the display part 2a. The diffuser 5 is a white translucent plate made of, for example, acrylic resin, and is placed in parallel with the display portion 2a of the liquid crystal panel 2. As shown in FIG. Hereinafter, the direction from the diffuser 5 toward the display part 2a of the liquid crystal panel 2 is designated as the surface direction, and the direction from the display part 2a toward the diffuser 5 is designated as the back direction.

The edge of the display portion 2 a of the liquid crystal panel 2 and the edge of the diffuser are supported by the resin frame 6 . The frame 6 is composed of two short-side members 12 and two long-side members 13 . A back mirror 8 is located on the back of the diffuser 5 . The center and adjacent parts of the back mirror 8 are substantially parallel to the diffuser 5 . Two opposite side portions 8a of the back reflector 8 are bent toward the surface side at an angle greater than 0° and less than 90° with respect to the center and adjacent portions of the back reflector 8 . The other two side portions other than the side portion 8a of the back mirror 8 form a notch portion 8b.

Fig. 3 is a perspective view showing the structure of the backlight unit 11 used in the liquid crystal display device of this embodiment. The backlight unit 11 includes a diffuser 5 which is not shown in FIG. 3 . As shown in FIGS. 2 and 3 , a plurality of lamps 10 such as cold cathode discharge tubes as linear light sources are arranged in parallel between the diffuser 5 and the back reflector 8 . At both ends of each lamp 10, there are lamp mounting members 9 made of rubber. Each lamp mounting part 9 is formed with a recess 9a for fitting the end of the associated lamp, and a portion 9b of U-shaped cross-section (see FIG. 9 ). Both ends of each lamp 10 are supported by recesses 9a. The lamp mounting part 9 is connected to the recessed portion 8b of the back reflector 8 through a portion 9b of its U-shaped cross section, whereby the lamp is mounted to the back reflector 8 . The lamp 10 is arranged parallel to the side portion 8 b of the back reflector 8 and is surrounded by the back reflector 8 and the frame 6 . The back reflector 8 is made of resin, for example, and has a white surface so as to reflect light irregularly, and the surface of the back reflector 8 may be provided as a mirror surface. Using screws (not shown), the back mirror is attached to the frame 1, whereby the liquid crystal display device is assembled as an integral unit. The lamp 10 used in this embodiment is a cold cathode discharge tube. The backlight unit 11 is composed of a frame 6 , a diffuser 5 , a lamp 10 , a lamp mounting member 9 , and a back mirror 8 .

Fig. 4 is a perspective view showing the structure of each short side member 12 used in the liquid crystal display device in this embodiment. 5A to 5D are plan views, they show the structure of each short side member 12, Fig. 5A is a side view, Fig. 5B is a top view, Fig. 5C is a side view orthogonal to Fig. 5A, Fig. 5D is opposite to Fig. 5A side view. As shown in FIGS. 4 and 5A to 5D, each short side part 12 is made of a top plate 12a, a reflector 12b, and a connecting part 12c; the top plate 12a extends along the longitudinal direction of the short side part 12 and is parallel to the liquid crystal. The plate 2; the reflector 12b also extends longitudinally and is inclined at an angle greater than 0° and less than 90° relative to the top plate 12a; the connecting parts 12c are located at both ends of the short side part 12 in the longitudinal direction. A groove 12d extending in the above-mentioned longitudinal direction is formed in the top plate 12a, and a stepped portion 12e also extending in the longitudinal direction is formed in the groove 12d. The edge of the diffuser 5 is fitted in the groove 12d whereby said groove supports the diffuser 5 . The stepped portion 12e accommodates therein a portion of a polarizer (not shown) of the liquid crystal panel 2 . At the lower end of the reflector 12b, a plurality of grooves 12f extending through the short side member 12 are formed in a row. As mentioned earlier, the reflector 12b is inclined with respect to the top plate 12a, and the short side part 12 is molded with a white resin so that the reflector 12b can reflect light from the lamp 10 toward the liquid crystal panel 2. That is, the reflector 12b functions as a side reflector. The lamp mounting part 9 (see FIG. 3 ) is fitted in the groove, and is fixed by the groove 12f. Furthermore, the connection part 12c is connected to the long side part 13, and to the side part 8a of the back mirror 8. As shown in FIG.

Fig. 6 is a perspective view showing the structure of each long side member 13 used in the liquid crystal display device of this embodiment. 7A to 7D are plan views showing the structure of the long side members, FIG. 7A is a side view, FIG. 7B is a top view, FIG. 7C is a side view orthogonal to FIG. 7A, and FIG. 7D is a side view on the opposite side of FIG. 7A. As shown in FIGS. 6 and 7A to 7D , the long side member 13 includes a top plate 13 a and side plates 13 b both of which extend along the longitudinal direction of the long side member. The cross section of the long side member 13 perpendicular to the longitudinal direction is L-shaped. The top plate 13a of the long side member 13 is formed to have protrusions 13c on both longitudinal ends thereof. Each protrusion 13c is constituted by two protrusions, a protrusion 13d extending in the longitudinal direction, and a protrusion 13e extending in a direction orthogonal to the longitudinal direction. The protrusion 13c is used for positioning and fixing the liquid crystal panel 2 . The top plate 13a has a stepped portion 13f extending in the longitudinal direction. The long side members 13 are formed by molding with resin.

Fig. 8 is a perspective view showing the structure of the connecting portion between each of the short-side members 12 and the long-side members 13 and their adjacent members. As shown in this figure, both the longitudinal ends of the top plate 12a of the short side member 12 and the connecting member 12c are connected to the top plate 13a of the long side member 13 . The stepped portion 12e of the short side member 12 is connected to the stepped portion 13f of the long side member 13 so as to provide a continuous stepped portion. In addition, a protrusion 13c including protrusions 13d and 13e is located on the surface of the corner portion of the frame 6 formed by the connection between the short side members and the long side members 12,13. The liquid crystal panel 2 (see FIG. 2) is placed on and supported by two continuous stepped portions constituted by stepped portions 12e and 13f, and the protrusion 13c. In addition, the connecting member 12e is connected to the side portion 8a of the back mirror 8 (see FIG. 3). A groove 12f is formed in the reflector 12b of the short side part 12, and the lamp mounting part 9 formed with the recess 9a is mounted in the groove 12f.

FIG. 9 is a perspective view showing the structures of the back reflector 8 , the lamp mounting part 9 and the lamp 10 . As shown in the figure, a plurality of notched portions 8b are formed at the edge portion of the back mirror 8 at equal intervals. Each lamp mounting part 9 has a recess 9a and a U-shaped section part 9b. Inside the U-section part is provided a raised portion (not shown) for fitting into a corresponding recessed portion 8b. By fitting this protrusion into the associated recessed portion 8b, it is possible to effectively position each lamp mounting part 9. As shown in FIG.

The end portion of the lamp 10 as a cold cathode discharge tube is fitted into the recess 9 a of the lamp mounting member 9 . The lamp mounting member 9 is positioned and mounted to the back reflector 8 by fitting the U-shaped section member 9b to the position of the notch portion 8b formed on the back reflector. As a result, the lamp 10 is fixed to the back reflector 8 . Lead wires (not shown) are drawn from both ends of the lamp 10, and each of them is connected to an external power source (not shown) through an inverter (not shown).

Now, the operation of the liquid crystal display device of this embodiment will be described. When power is fed to the lamp 10 shown in FIG. 2, the lamp 10 emits light. The light emitted from the lamp 10 is incident on the diffuser 5 directly, or is incident on the diffuser 5 after being reflected by the back mirror 8 . The light thus incident on the diffuser 5 passes through the diffuser to be diffused and becomes uniform, and then enters the display portion 2 a of the liquid crystal panel 2 . The display portion 2a controlled by the connection substrate 2b selectively transmits incident light and generates colors therefrom. As a result, an image is formed on the surface side of the display portion 2a.

In the liquid crystal display device of this embodiment, since the grooves 12d and the protrusions 13c are formed in the frame 6, there is a possibility of affecting the positioning of the diffuser 5 and the liquid crystal panel 2 and supporting them. Therefore, it is possible to omit positioning members, metal bases, and resin frames (see FIG. 1 ) used in conventional liquid crystal display devices. Besides, since the reflector 12b is housed in the frame 6 and the lamp 10 is mounted on the back mirror 8, it is possible to omit the side reflector (see FIG. 1) used in the conventional liquid crystal display device, whereby, The number of devices in the liquid crystal display device can be reduced. Thus, liquid crystal display devices can be mounted more easily by reducing the number of devices used. The cost of the liquid crystal display device is reduced because the number of parts used is reduced and the mounting work becomes easier. In addition, since the metal base and the resin frame can be omitted, it is possible to narrow the image frame area.

In this embodiment of the liquid crystal display device, the lamps 10 are attached to the back reflector 8, and therefore, when the lamps 10 are replaced, all lamps can be replaced by removing the back reflector 8. As a result, the efficiency of lamp replacement work is improved.

In addition, in this embodiment of the liquid crystal display device, since the lamp 10 is mounted on the back reflector 8 through the lamp mounting part 9 made of rubber, it is possible to buffer external vibrations and shocks, thereby preventing damage to the lamp 10. In the conventional method of forming the notch portion in the side reflector to support the lamp, the increase of the notch portion reduces the advantage of the side reflector, and at the same time it is difficult to further narrow the reflection area on the side reflector, so it is impossible to Many lamps are used in a liquid crystal display device. On the other hand, in this embodiment according to the present invention, the number of lamps 10 can be made larger than that of the prior art because the lamps 10 are supported by the lamp mounting part 9 . Therefore, it is possible to increase the luminance of the display portion 2a, and to widen the luminance adjustment range. Besides, by increasing the number of lamps 10, it is possible to improve the uniformity of luminance, whereby it is possible to shorten the distance between the lamps 10 and the liquid crystal panel 2, and thus it is possible to make the liquid crystal display device thinner.

In addition, in the liquid crystal display device of this embodiment, since the frame 6 is made of resin, even if the frame 6 is in contact with the display area 2a of the liquid crystal panel 2 made of glass, there is no fear of damaging the display portion 2a. Therefore, it is possible to omit spacers used in conventional liquid crystal display devices (see FIG. 1). As a result, it is possible to further reduce the number of devices used and further reduce the cost. In addition, since the frame 6 is made of resin, it is not necessary to provide an insulating member between the connection substrate 2b of the liquid crystal panel 2 and the frame 6, nor is it necessary to cover the lead wire (not shown) for the lamp 10 with an insulating film, This allows for further cost reductions.

In addition, since the frame 6 is composed of two short-side parts 12 and two long-side parts 13, in the installation of the liquid crystal display device, the liquid crystal panel 2, the diffuser 5 and the back light for the frame 6 are installed. Working with Mirror 8 just got easier. In addition, the size of a mold for manufacturing the frame 6 can be reduced, enabling further cost reduction. Since the frame 1 is made of metal, it is possible to impart shielding properties to the frame 1 .

Although the frame 6 used in this embodiment is composed of short side and long side parts 12, 13, the frame 6 can also be a complete part, thus, although the size of the mold used to manufacture the frame 6 becomes larger, the The number of devices used in the liquid crystal display device can be further reduced. Although the back reflector 8 used in this embodiment is made of resin, it may be made of metal, or may include metal such as aluminum or aluminum alloy and white resin coated thereon. Although the lamp mounting member 9 used in this embodiment is made of rubber, it may be made of another material. By constituting the lamp mounting member using a material excellent in thermal conductivity, heat can be efficiently radiated from the lamp 10 .

In the invention, the space between adjacent notch portions 8b can be set narrower than conventional liquid crystal display devices, and like this, the notch portions 8b in the back reflector 8 can be formed in advance in a number greater than the number of lamps 10, by Therefore, it is possible to select an appropriate number and layout of the lamps 10 when installing the liquid crystal display device. It is also convenient to change the number and layout of the lamps 10 after the liquid crystal display device has been used for a period of time. In addition, the lamp mounting member 9 can also be attached to the back reflection mirror 8 without forming the notch portion 8b in the back reflection mirror. In this way, it is possible to set a desired mounting position of the lamp mounting part 9 for the back reflector 8, and therefore, the number and positions of the lamps 10 can be set arbitrarily. Therefore, when the lamps need to be replaced due to deterioration over time after using the liquid crystal display device, the number and positions of the lamps can be easily changed from their original number and positions. Also, although in this example the back reflector 8 is attached to the frame 1 by screws, the back reflector 8 may be attached to the frame 1 by mounting or by using double-coated adhesive tape or the like.

Claims (17)

1. Liquid crystal display devices, including: a number of light sources; a back reflector placed on the back of the liquid crystal display device so as to reflect light from the light source; a diffuser opposite said back reflector with said light source between them, for transmitting and diffusing light emanating from said light source; a liquid crystal panel capable of selectively transmitting light that has passed through said diffuser, thereby forming an image; and The frame is provided with both a diffuser supporting portion for supporting the diffuser and a liquid crystal panel supporting portion for supporting the liquid crystal panel. 2. according to the liquid crystal display device of claim 1, also comprise the mounting part that is made of elastic material, it is characterized in that the two ends of described light source are detachably installed on the described back reflector, and each end passes through respectively described installation parts. 3. The liquid crystal display device according to claim 2, wherein said mounting member is made of rubber or resin. 4. The liquid crystal display device according to claim 1, further comprising side reflectors placed along the inner surface of the frame, that is, along the sides of the liquid crystal display device, for directing light emitted from the light source toward the LCD panel reflection. 5. The liquid crystal display device according to claim 1, wherein said frames are assembled into a frame shape by connecting at least two separated frames. 6. The liquid crystal display device according to claim 5, wherein the frame can be separated at four corner parts, and the frame can be assembled by connecting four substantially linearly separated frames respectively. box shape. 7. The liquid crystal display device according to claim 5, wherein said divided frames are connected together by fitting respective ends to each other. 8. A liquid crystal display device according to claim 6, wherein said divided frames are connected together by fitting respective ends thereof to each other. 9. The liquid crystal display device according to claim 5, further comprising a side reflector for reflecting light emitted from said light source toward said liquid crystal panel, characterized in that said two separated frames face each other, said Two separate frames are integrated with the two side reflectors respectively. 10. A liquid crystal display device according to claim 9, wherein said two side reflectors integrated with said separate frame have grooves for fitting said mounting member therein. 11. The liquid crystal display device according to claim 9, wherein the remaining said side reflectors not combined with said separate frame are integrally formed with said back reflector so as to stand up from the back reflector, and arranged to face each other, and connected to the two side reflectors combined with the separate frame. 12. The liquid crystal display device according to claim 5, wherein said divided frame is formed by molding resin. 13. A liquid crystal display device according to claim 5, wherein said divided frame is formed of metal coated with resin. 14. The liquid crystal display device according to claim 1, wherein said back mirror is formed by coating a light-reflecting material on the upper surface of the metal plate to form a light-reflecting surface on the metal plate. 15. A liquid crystal display device according to claim 1, wherein said frame is detachably fixed to said back mirror. 16. The liquid crystal display device according to claim 1, further comprising a frame for fixing said liquid crystal panel to said frame. 17. According to the liquid crystal display device of claim 2, it is characterized in that each of said mounting parts has a part of a U-shaped section and a recess, and the part of the U-shaped section is used to install a side edge part of said back reflector , each of the light sources can have its end inserted into or through the recess.

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