JPS6072493A - Panel block structure of liquid crystal television receiver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention is equipped with a liquid crystal panel that displays television images,
This invention relates to a panel block structure in a liquid crystal television device that allows viewing of television images by introducing light to the back surface of a liquid crystal panel.

An object of the present invention is to provide a flange around the outer periphery of a light guide plate that guides light at the bottom of a liquid crystal panel, thereby protecting the fragile panel glass placed thereon and improving the strength of the panel block.

Another object of the present invention is to reduce the number of parts and the cost of parts by integrating a light guide plate that guides light to the lower part of a liquid crystal panel and a frame on which the liquid crystal panel is placed.

Still another object of the present invention is to integrate a light guide plate that guides light to the lower part of a liquid crystal panel and a frame body on which the liquid crystal panel is placed, and to make this frame body a flange of the light guide plate. The object of the present invention is to make it easier to place components such as a panel board and a driver board on the top of the block, thereby improving ease of assembling the panel block.

In recent years, the development of video culture and video technology has been remarkable, and in the broadcasting system, Captain System, Hi-Obis, teletext, satellite broadcasting, etc. are being considered, and in the receiver area, high-definition television, digital television, flat cathode ray tube, etc. This includes the development of television image display liquid crystal panels.

Traditionally, only CRTs have been introduced into the market for displaying television images, but recently, new television image display means such as liquid crystals, plasma displays, EL, and LEDs are making rapid progress. Among these, liquid crystal television image display is relatively outstanding and has even been commercialized in some cases.

On the other hand, when comparing CRTs and LCDs, CRTs are internally emissive, so they are easy to see even when the surroundings are relatively dark, but they are difficult to see when the surroundings are too bright.On the other hand, LCDs are not internally emissive, so Light is needed. External light may be taken in from the front side of the liquid crystal panel, or from the back side. The present invention relates to a panel block structure of a liquid crystal television when light is introduced from the back side of a liquid crystal panel using a light guide. Recently, LCD televisions have appeared that allow light to be introduced from the back side of the LCD panel and display color images by installing a color filter on a portion of the LCD panel.

FIG. 1 shows an example of the panel block structure of a conventional liquid crystal television. In Figure 1, 1 is a light guide plate, 2 is a liquid crystal panel, 3 is a lamp, 4 is a fixing screw, 5 is a fixing part for attaching the liquid crystal panel, 6 is a screw fixing plate integrated with 5, and 7 is the tip of the light guide plate. 8 is an enlarged view of part 9 inserted into part 5, and has a Fresnel structure. First, the mechanism of guiding light emitted from a lamp will be explained using FIG. The light emitted from the lamp is emitted around the entire circumference of the lamp, but a portion of the light rays enters the light guide bowl through the surface 10 of the light guide plate. At this time, the light guide plate needs to be made of a translucent material such as acrylic or glass. Furthermore, if a mirror is provided at the location shown in FIG. 11, the light emitted on the opposite side of the light guide plate will be reflected by this mirror and a portion will be incident on the surface 10 of the light guide plate. A portion of the light incident on the surface 10 of the light guide plate is reflected from the upper surface of the light guide plate as indicated by arrow 12, and is further reflected from the lower Fresnel surface to reach the liquid crystal panel. The other part is directly reflected from the Fresnel surface as indicated by arrow 16 and reaches the liquid crystal panel.

Further, Fig. 2 shows an example of the panel block structure of a conventional LCD TV, in which 14 is a light guide plate, 15 is a liquid crystal panel, 16 is an exterior, 17 is a frame for fixing the liquid crystal panel, 18 is a fixing screw, 19 , denotes a lamp, and 20 denotes a light guide plate fixing part.The mechanism for guiding light emitted from the lamp to the liquid crystal panel is the same as that shown in FIG.

As is clear from Figures 1 and 2, in the panel block structure of conventional liquid crystal panels, the members that fix the liquid crystal panel, which are generally made of fragile materials such as glass, are thin or thin. 1 Figure 5) or the LCD panel fixing frame (Figure 2 15), the LCD panel fixing parts or the LCD panel fixing frame are too weak to resist the force applied from the outside and are fixed. The liquid crystal panel could not be fully protected and was easily destroyed, and the strength of the panel block was low.

Furthermore, in the panel block structure of a conventional LCD TV, for example, as shown in FIG. 1, the member 5 for fixing the liquid crystal spring frame and the light guide plate 1 are separate bodies, and fixing screws 4 are required.
Furthermore, in FIG. 2, the liquid crystal panel and the light guide plate are fixed by completely different fixing members 17 and 18, each requiring fixing screws, which generally requires a large number of parts and therefore high parts cost. Ta.

Furthermore, in the panel block structure of a conventional LCD TV, for example, as shown in Fig. 1, the tip 7 of the light guide plate is inserted into the hole of the liquid crystal panel fixing part, and then the opposite side is fixed with screws as shown in 4 in the figure. After that, it is necessary to attach the liquid crystal panel to the liquid crystal panel fixing parts, and in Figure 2, it is necessary to fix the liquid crystal panel and the light guide plate to separate parts, and this series of operations requires many steps and is difficult to work with. Not only is this not good, but especially in the case of Figure 2, the LCD panel is directly fixed to the exterior with the LCD panel fixing frame, so the LCD panel drive circuit must be installed outside of the LCD panel fixing frame. The lyricism of the panel blocks was extremely poor.

As described above, the conventional panel block structure of a liquid crystal television has various drawbacks such as low strength, high parts cost, and poor assembly workability.

The present invention aims to eliminate such drawbacks, and FIG. 6 shows a perspective view including a cross section of the panel block structure of a liquid crystal television according to the present invention. In FIG. The light plate portion 23 indicates a flange portion.

Further, 24 in the figure has a Fresnel surface, and arrow 25 indicates an intake port for external light from a lamp or the like. Further, 26 in the figure indicates a wall around the outer periphery of the light guide plate portion according to claim 2. The mechanism by which external light 25 is guided to the back surface of the liquid crystal panel via the light guide plate is basically the same as the conventional panel block structure.

As is clear from FIG. 3, the panel block structure of the liquid crystal television according to the present invention first surrounds the outer periphery of the light guide plate with a wall 26, further surrounds the outer periphery of this wall with a flange 23, and forms these all in one piece to guide the light guide. Since it is used as a light body, the moment of inertia of the cross section of the light guide increases, and therefore the rigidity of the light guide plate improves, which in turn makes it easier to protect the liquid crystal panel placed on this flange. As mentioned above, liquid crystal panels are generally made from glass, which is a highly brittle material.
Therefore, it is extremely weak against bending force, but the panel block structure of the LCD TV according to the present invention has an extremely high rigidity of the light guide, so this fragile LCD panel is well protected, and the strength of the panel block is increased from high to high. It is.

Furthermore, in the panel block structure of the LCD TV according to the present invention, the light guide plate and the mounting table for fixing the liquid crystal panel, so-called flange parts, are integrated, and the light guide serves both as a light guide and fixing the liquid crystal panel, so the structure of the panel block is The number of parts and accompanying parts such as fixing screws are also reduced, resulting in an extremely low cost of parts.

Furthermore, in the panel block structure of the liquid crystal panel according to the present invention, the light guide plate that guides light and the frame body on which the liquid crystal panel is placed are integrated at the bottom of the liquid crystal panel to form a light guide, which greatly simplifies the panel block structure. In addition to the above-mentioned frame body, that is, the flange part of the light guide, panel block accessory parts such as a driver board equipped with a drive circuit that drives the liquid crystal panel and a panel board that connects these driver boards are mounted. In order to make it possible to
This makes it possible to improve the ease of assembly of panel blocks.

As described above, the panel block structure of the liquid crystal television according to the present invention has various advantages, such as protecting the liquid crystal panel and having high strength, having a small number of parts and low parts cost, and having good assembly workability.

Note that 27 in FIG. 3 indicates that the light guide plate surface portion of the light guide opposite to the liquid crystal panel is an inclined surface, and the present invention also includes cases where this surface is a cylindrical surface or other curved surface. Of course, the present invention includes slight modifications or improvements to the present invention without departing from the basic idea of the present invention, such as including external light guide means other than those shown in FIG. It is.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an example of the panel block structure of a conventional liquid crystal television. FIG. 2 is a sectional view of another example of the panel block structure of a conventional liquid crystal television. FIG. 3 is a perspective view including a cross section of an example of the structure of a panel block of a liquid crystal television according to the present invention. 1...Light guide plate 2...LCD panel 3...Lamp 4...Fixing screw 5.・・・・・・Fixation for mounting LCD panel ■S product 6・
...... Screw fixing plate 7 ...... Insertion part 8 at the tip of the light guide plate...
. . . Enlarged view of part 9 . . . Part 10 of enlarged view 8 .
... Part where the mirror is installed 12 ... Example of the path where light is guided from the lamp to the back surface of the liquid crystal panel 13 ... Other path where light is guided from the lamp to the back surface of the liquid crystal panel Example 14... Light guide plate 15... Liquid crystal panel 16... Exterior 17... Liquid crystal panel fixing frame 18... Fixing screw 19 ... Lamp 20 ... Light guide plate fixing member 21 ... Liquid crystal panel 22 ... Light guide plate portion 23 of the light guide body ... Flange Part 24...Fresnel surface 25...Intake port 26 for external light from lamps, etc.
・・・・・・Wall 27 on the outer periphery of the light guide plate portion・・・・・・Above the slope opposite to the lower surface of the liquid crystal panel of the light guide plate Applicant: Suwa Seikosha Co., Ltd. Agent Patent attorney Tsutomu Mogami

Claims (1)

[Scope of Claims] 1. In a liquid crystal television device equipped with a liquid crystal panel for displaying television images and capable of viewing the television images by introducing light into the back side of the liquid crystal panel, there is provided a liquid crystal television device in which light is provided at the bottom of the liquid crystal panel. A panel block structure for a liquid crystal television, characterized in that a light guide plate is arranged to guide the light guide plate, a flange is provided on the outer periphery of the light guide plate over at least two sides thereof, and the light guide plate and the flange part are integrated. 2. The surface of the light guide plate facing the lower surface of the liquid crystal panel is an inclined surface, cylindrical surface, or other curved surface, the opposite surface is provided with grooves, and the maximum thickness of the light guide plate is t.
In this case, at least two sides of the outer periphery of the light guide plate part are surrounded by a wall with a height of 0.7 to 1.5 t, and a flange is provided on the outside of the outer peripheral wall, and these are integrated. A panel block structure of a liquid crystal television set according to claim 1.