JP2010109803A - Liquid crystal television - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal television which can carry out upsizing and thinner making while maintaining rigidity without making weight increase. <P>SOLUTION: The liquid crystal television using a liquid crystal panel includes: a back light; a back light chassis provided with a control circuit; and a back cover for concealment of the control circuit, securement of design nature, and the like. Further, the back cover has a portion which holds the liquid crystal panel or/and suppresses movement of the liquid crystal panel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present technology relates to a liquid crystal television that is rapidly becoming thinner and lighter in recent years.

  In recent years, the spread of flat panel televisions (hereinafter referred to as liquid crystal televisions) using liquid crystal panels has been rapidly increasing. At the same time, space saving, screen size increase, and price reduction by lightening and thinning are proceeding at a remarkable pace. In the future, there is a strong demand for the development of technology that realizes the conflicting propositions of lightening and thinning the space and increasing the screen size at a low manufacturing cost.

  By the way, if the liquid crystal television is increased in size and thickness, there is a problem that the rigidity of the entire television is lowered and the liquid crystal television is easily deformed. Since excessive deformation of the liquid crystal television causes damage to the display, maintaining this rigidity is extremely important.

Conventionally, when advancing the size increase, a reduction in rigidity using a reinforcing member has been often taken because a reduction in thickness has not been excessively required. For example, LCD TVs have a component called a backlight, and a component called a backlight chassis that uses sheet metal to support it is used. The thickness of this chassis is increased, and four walls are bent to form a standing wall. In some cases, a method of increasing the cross-sectional second moment is employed (for example, Patent Document 1). In addition, there is a case in which a method of securing a rigidity by applying a reinforcing member to a portion that is easily deformed is sometimes used.
JP 2007-86648 A

However, as described above, in addition to increasing the size, it is now required to reduce the thickness and further reduce the manufacturing cost, and reduce the number of separate parts to reduce the thickness and the manufacturing cost of the backlight chassis itself. Is becoming necessary. Therefore, it is becoming difficult to use the conventional method of maintaining the rigidity of the entire liquid crystal television only by improving the rigidity of the backlight chassis. The object of the present invention has been made in view of the above circumstances, and the weight is reduced. An object of the present invention is to provide a liquid crystal television that can be increased in size and thickness while maintaining rigidity without being increased.

  First, the present inventors examined by numerical analysis how the rigidity changes when the liquid crystal television is made thinner and larger. As a result, it has been found that when the thickness of the liquid crystal television falls below a certain thickness, the rigidity rapidly decreases. As a result of studying the cause, the present inventors have found that the cause is that the deformation behavior of the liquid crystal television in the thickness direction changes greatly.

  Therefore, the present inventors have reexamined how the rigidity of the liquid crystal television is maintained. As a result, it has been found that the rigidity of the liquid crystal television is maintained in a portion corresponding to the thickness direction of the backlight chassis. From this, the present inventors have found that if an appropriate member is first added to that portion of the backlight chassis, both a reduction in thickness and an increase in size can be achieved. However, since the number of members used increases as it is, there is a problem that an increase in weight and manufacturing cost occurs. Therefore, we further studied the structure of the entire LCD TV. In this study, attention was paid to a back cover that is used to conceal an electric circuit in a liquid crystal television. And it discovered that a cross-section secondary moment could be enlarged and rigidity could be improved by combining and integrating a backlight chassis and a back cover. Furthermore, since the rigidity is remarkably improved by integration, it has been found that the rigidity can be secured even if the bezel parts that have been used for securing the liquid crystal and securing the rigidity of the liquid crystal television are omitted. Therefore, we investigated the method of reducing the number of used bezel parts. As a result, it was found that the liquid crystal can be fixed even if the number of bezels used is reduced by adjusting the processing method of the end portion of the back cover.

The present invention has been made by integrating the above findings and further diligently examining them.
That is, the invention according to claim 1 of the present invention is a liquid crystal television using a liquid crystal panel, and has a purpose of concealing the control circuit, ensuring design, etc., with a backlight and a control circuit. The liquid crystal television is characterized in that the back cover is combined.

  The invention according to claim 2 of the present invention is the liquid crystal television set according to claim 1, characterized in that the back cover has a portion for holding the liquid crystal panel and / or a portion for suppressing movement of the liquid crystal panel. LCD TV.

  According to a third aspect of the present invention, in the liquid crystal television according to the first or second aspect, the back cover is formed by press-molding a steel plate, and the liquid crystal panel included therein The liquid crystal television is characterized in that the portion for holding the light and / or the portion for suppressing the movement of the liquid crystal panel is formed by folding the steel plate.

  According to the present invention, it is possible to provide a liquid crystal television that is large in size and strong despite being thin, and that is light in weight and low in manufacturing cost.

  The best mode for carrying out the present invention will be described below. FIG. 1 is a diagram showing a configuration example of a liquid crystal television according to the present invention. In the figure, 1 is a backlight chassis having a control circuit and a backlight, 2 is a back cover, 3 is a liquid crystal panel as a display unit, and 4 is a liquid crystal television. The liquid crystal television 4 includes a backlight chassis 1 having a control circuit, a backlight, and the like, a back cover 2, and a liquid crystal panel 3.

  The rigidity and strength of the liquid crystal television 4 are held by the backlight chassis 1 and the back cover 2 coupled thereto. By combining these two parts, a closed cross section can be formed inside the liquid crystal television, and as a result, the rigidity can be remarkably improved. In addition, by using these two parts, the stress can be dispersed with respect to the load, and as a result, the strength can be improved.

  The material used for the backlight chassis 1 may be any material as long as it has an elastic modulus that can maintain the shape and has a strength that does not break even when used as a television component. In particular, metals are suitable because they are excellent in specific strength and easy to process. The specific strength is represented by a numerical value obtained by dividing the strength of the material by the weight per unit volume (specific weight). If this specific strength value is high, higher strength can be obtained with the same weight. In other words, if you try to make an object with the same strength, it will be lighter. In particular, a steel material containing iron as a main component is extremely preferable in that it has a high specific strength, is easy to process, is inexpensive, and can be expected to provide a stable supply.

  As a method of making a backlight chassis with steel materials, for example, a method of bending a steel plate to obtain a desired shape, a method of obtaining a shape by applying a process such as stretching the steel plate with a press, or producing an outer shape using a steel bar or a pipe Then, there is a method of pasting opaque material or a material for light shielding, and any method may be used in the present invention.

  In the case where a steel plate is used as a starting material, the steel plate itself has low rigidity, and therefore it is preferable to apply an overhanging process and a bending process so that the height is increased in a direction extending vertically to the surface of the steel sheet. It is preferable that the periphery of the backlight chassis is higher than the installation surface of the backlight and has a substantially box shape. By doing so, it is possible to prevent external light from entering the backlight chassis from the surroundings, and to eliminate the uneven color of the screen of the liquid crystal television.

  The method of forming the portion corresponding to the wall of the box by bending the periphery is preferable because the effect of improving the rigidity of the backlight chassis is remarkable and the formation is easy. Also, if it is necessary to secure more rigidity, increase the folding height of the bent portion of the peripheral portion, increase the number of folding, to form a protruding portion called a bead in the flat portion of the backlight chassis, There are methods such as adding another reinforcing member. In the present invention, any of these methods may be used, or may be used in combination. Of course, other methods of securing rigidity may be used.

  The height of the portion constituting the wall around the backlight chassis may be appropriately determined in consideration of the design of the liquid crystal television. Considering the object of the present invention to improve the rigidity, the height is preferably 5 mm or more. In the present invention, the direction corresponding to the thickness of the display is defined as “height”.

  The upper limit of the height is not particularly defined, but if it becomes extremely large, the thickness of the display becomes large. Therefore, it is preferable that both be 40 mm or less. In the case of producing from a plate, the thickness of the plate is not particularly defined, but may be appropriately determined in consideration of the size and weight of the display. In consideration of ease of processing, stability of material supply, etc., about 0.4 mm to 1.8 mm is desirable. By the above method, it becomes possible to obtain a strong and durable backlight chassis by itself.

  In the present invention, it is possible to greatly improve the rigidity of the entire liquid crystal television by combining and integrating the backlight chassis and the back cover obtained as described above. In addition to improving rigidity, the back cover can also eliminate design deterioration due to the drive circuit being exposed and the risk of electric shock due to contact with the exposed circuit. Turn on.

  In the present invention, any cover may be used as long as it serves as a cover. In order to improve the rigidity of the entire liquid crystal television, the backlight chassis and the back cover are preferably joined and joined at a plurality of locations or regions. As a material for the back cover, steel is suitable for the same reason as the backlight chassis. Furthermore, since the outer shell is a part that can be observed from the surroundings, design is often required, and it is necessary to paint, but various surface treatments and painting treatments can be applied to steel, so this application is satisfied. It is also possible. In addition, since an outer shell part becomes large in area, it tends to cause an increase in weight. Therefore, the plate thickness is preferably about 0.2 mm to 1.0 mm.

  It is preferable that the backlight cover and the back cover are integrated as much as possible. This is because, if separated, the effect of improving the rigidity and strength of the display may be insufficient. If it must be separated due to processing reasons, the back covers are joined together by means such as screwing, caulking, bonding using adhesive or double-sided tape before or after being combined with the backlight chassis. It is preferable to keep it. The shape of the back cover may be appropriately determined based on the processing method, design properties, and the like.

  The thickness may be appropriately determined in consideration of the target thickness of the liquid crystal television. As a method for producing the back cover, for example, a method of producing a sheet metal as a raw material by bending such as bending, projecting, trimming or the like can be mentioned. Of course, other methods may be used in the present invention. In addition, when press work is used, it has the characteristic that formation of the part which suppresses holding | maintenance and a movement of the liquid crystal panel mentioned later becomes easy by adding a press process.

  Next, a portion that holds the liquid crystal panel and / or a portion that suppresses the movement of the liquid crystal panel, which is a feature of the present invention, is described.

  Conventionally, after a liquid crystal panel is placed on a backlight chassis, a frame-shaped component called a bezel is placed on the liquid crystal panel, and the liquid crystal panel is fixed by being sandwiched between the bezel and the backlight chassis. In the present invention, the liquid crystal can be fixed without using the bezel by providing the back cover with a portion for holding the liquid crystal panel and / or a portion for suppressing the movement of the liquid crystal panel.

  FIG. 2 is a diagram schematically illustrating a back cover for holding the liquid crystal panel. In the figure, (b) shows a section for holding the liquid crystal panel, and (c) shows a cross-sectional view of the section for suppressing the movement of the liquid crystal panel in the A-A ′ section. FIG. 3 is a diagram showing a state in which a liquid crystal panel is set in each of FIGS. 2B and 2C. The positional relationship between the liquid crystal panel and the back cover in a portion where holding or movement of the liquid crystal panel applied to the back cover is suppressed is shown.

  In order to fix the liquid crystal panel, as shown in FIG. 2, the liquid crystal panel is held or fixed by inserting the liquid crystal panel into a groove portion existing in the figure. In addition, as a holding method, the tolerance of the width of the groove and the width of the liquid crystal panel is reduced, and when fitted, it is fixed by frictional force, or an adhesive or a double-sided tape is attached to the groove or the portion where the liquid crystal panel is inserted The method of sticking and adhering etc. is mentioned. In the present invention, these methods may be used in combination, or methods other than those listed here may be used.

  In addition, when vibration during transportation is applied, a portion where the liquid crystal panel is fitted in the groove may move and be damaged. Examples of the buffer material arrangement method include a method of arranging the buffer material on the liquid crystal panel side, a method of arranging the buffer material on the groove side, or both of them. It doesn't matter. Moreover, you may arrange | position to the whole region which contacts, may arrange | position only to a part of peripheral part, or may arrange | position to only a part of peripheral part of an upper, lower, left, and right. From the viewpoint of holding the liquid crystal panel, it is preferable to have at least one holding portion on the upper peripheral edge.

  Furthermore, from the viewpoint of suppressing the movement of the liquid crystal panel, in addition to the above-mentioned holding location existing on the upper peripheral edge, at least one, preferably two or more, left and right left and right peripheral edges It is preferable to arrange them symmetrically. For example, in the case of the back cover shown in FIG. 2, the liquid crystal panel is installed so as to be inserted from the lower peripheral portion toward the upper peripheral portion. If there are places to be fixed to the left and right peripheral portions, it may be difficult to insert the liquid crystal panel, which is not preferable.

  In the present invention, the back cover having a portion for holding the liquid crystal panel and / or a portion for suppressing movement of the liquid crystal panel is preferably formed by press-molding a steel plate. By applying the press forming of the steel plate, it becomes possible to form a complicated shape in a short time, increase the productivity of the back cover, and reduce the manufacturing cost. Since the back cover needs to cover the backlight chassis, a depth corresponding to the thickness is required. In the case of pressing a sheet metal, methods for obtaining this depth include bending, overhanging, and the like. Overhang molding is performed with the corners of the back cover connected.

  By connecting in this way, it is possible to avoid problems such as deterioration of the design and rust prevention ability caused by the appearance of the end face of the steel plate alone, and also improve the rigidity of the entire LCD TV. be able to. Therefore, in the present invention, it is preferable to mold the back cover by overhanging. Of course, methods other than those listed here may be used in the present invention.

    The A-A ′ cross section of the portion for holding or fixing the liquid crystal panel shown in FIG. 2 can be obtained by simultaneously bending the end face. As described above, it is preferable to place a cushioning material or a fixing material in the groove portion. However, when forming by pressing, it can be stretched in advance to the groove portion, so these This is preferable because it is easy to arrange. In addition, by adjusting the press conditions, the groove can be made separately for holding the liquid crystal panel and for suppressing the movement of the liquid crystal panel, just by changing the degree of bending, and when forming the groove for holding the liquid crystal panel, It is also possible to have both roles by increasing the degree of bending of only a part. By doing so, it becomes possible to achieve both the ease of fitting the liquid crystal panel and the function of fixing.

  In liquid crystal televisions, design is strongly required. If the head of the fixing screw can be seen and there is a concern about deterioration of the designability, a resin cover or the like having an external appearance with an excellent designability may be attached. In that case, as shown in FIG. 5, it is preferable to provide a claw receiving hole 5 for fixing the resin cover to the back cover. By doing so, it becomes possible to easily fix the resin cover having the claws.

It is a figure which shows the example of 1 structure of the liquid crystal television concerning this invention. It is a figure which represents typically the back cover for hold | maintaining a liquid crystal panel. FIG. 2B and FIG. 2C are diagrams showing a state in which a liquid crystal panel is set in each. It is a figure which shows an example of arrangement | positioning of the nail | claw receiving hole in the case of attaching a front cover separately.

Explanation of symbols

1 Back Cover 2 Backlight Chassis 3 LCD Panel 4 LCD TV 5 Claw Receiving Hole

Claims (3)

An LCD TV using an LCD panel,
A liquid crystal television comprising a backlight chassis having a backlight and a control circuit, and a back cover for concealing the control circuit and ensuring design properties. The liquid crystal television set according to claim 1.
A liquid crystal television comprising a portion for holding a liquid crystal panel and / or a portion for suppressing movement of the liquid crystal panel on the back cover. The liquid crystal television set according to claim 1 or 2,
The back cover is formed by press-molding a steel plate, and a portion for holding the liquid crystal panel and / or a portion for suppressing movement of the liquid crystal panel are formed by folding the steel plate. LCD TV.

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