JP2007219428A - Display device, and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize a liquid crystal display device which has a compact and robust structure while suppressing cost increase, and a method of manufacturing the same. <P>SOLUTION: A frame and an LCD are stuck and fixed to each other with heating by arranging a fixing member with a heat-shrinkablity thereacross. With this constitution, even when external stress is applied to the display device, upward peeling off of a display panel is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a non-self-luminous display device such as a liquid crystal display device used in an electronic device such as a mobile phone. In detail, it is related with the structure of the display apparatus which fixes various structural members including a display panel mutually.

  In recent years, as a display device, for example, a liquid crystal display device is configured by assembling a mold frame in which a liquid crystal display panel, an optical sheet, and a light guide are stored. In such a liquid crystal display device, in order to prevent the liquid crystal display panel from lifting up due to external stress such as vibration during transportation, twisting when dropped in a casing of a mobile phone, dropping, etc. A fixing method has been proposed. For example, a structure in which a liquid crystal display panel is held and fixed with a mold frame made of plastic via a double-sided fixing tape disposed on the peripheral edge of the lower surface of the liquid crystal display panel is often used. This liquid crystal display panel is provided with a double-sided fixing tape at its peripheral edge for light shielding. The double-sided fixing tape has light shielding properties and is fixed to the mold frame simultaneously with the optical film. In addition, a structure has been proposed in which a part of the mold frame has a hook shape and holds several points on the upper surface of the liquid crystal display panel.

As another method, a structure constructed by holding and fixing to a metal frame has been proposed. When the liquid crystal display panel is held on the metal frame, a double-sided fixing tape is arranged on the peripheral edge of the lower surface of the liquid crystal display panel, and the metal frame is attached to the peripheral edge from above the liquid crystal display panel at the same time as holding and fixing to the mold frame. The cover is held and fixed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-305205

  In such a liquid crystal display device composed of a liquid crystal display panel, a mold frame, and a double-sided fixing tape, there is a problem that the liquid crystal display panel and the mold frame are easily peeled off. That is, in the configuration of such a liquid crystal display device, the liquid crystal display panel and the mold frame are fixed and held only at the peripheral edge of the lower surface of the liquid crystal display panel, so when subjected to external stress such as vibration and twisting, Regulatory power against upward peeling does not work. Therefore, it is easy to peel off. Furthermore, along with the narrowing of the frame required for liquid crystal display devices in recent years, the adhesive area between the double-sided fixing tape and the liquid crystal display panel is reduced, resulting in a problem that the adhesive force is reduced and the separation becomes easier. Was. In addition, in the structure in which a part of the mold frame is hook-shaped, it is possible to suppress the liquid crystal display panel from being lifted upward, but since the hook-shaped mold frame and the liquid crystal display panel are locally in contact with each other, there is no stress when dropped. There was a problem that the liquid crystal display panel made of glass was easily broken, because it was easy to concentrate. Furthermore, in the liquid crystal display device having the structure as disclosed in Patent Document 1, since the metal frame is covered from above the liquid crystal display panel, it is possible to prevent peeling upward, but the liquid crystal display device has the thickness of the metal frame. Had the problem of becoming thicker. Moreover, since the member is added, there is a problem that the cost increases. Accordingly, an object of the present invention is to realize a liquid crystal display device characterized by a compact and robust structure while suppressing an increase in cost.

  In the present invention, the mold frame and the liquid crystal display panel are arranged so as to straddle with a heat shrinkable fixing member, and are bonded and fixed by heating. By fixing and holding the heat shrinkable fixing member in this manner, the upward movement of the liquid crystal display panel is restricted by the fixing member even when subjected to external stress such as vibration or torsion. There is no uplift.

  The display device of the present invention has an effect of preventing the display panel from being peeled upward by arranging the mold frame and the display panel so as to span the heat-shrinkable fixing member and bonding and fixing by heating. ing. In addition, since it is not necessary to cover the metal frame from above, the display device can be thinned. Further, since the fixing means having an extremely simple configuration is used, an increase in cost can be suppressed.

The display device of the present invention includes a non-self-luminous display element, a light source, a light guide that guides light from the light source to the display element, and a frame that holds the light guide, and the display element and the frame are thermally contracted. It is the structure fixed with the fixing member which has property. According to such a configuration, since the frame and the display element are simultaneously fixed by the fixing member, peeling of the display element can be effectively prevented.

Furthermore, the frame is formed with a recess in a portion where the fixing member is provided. As the fixing member, a sheet material containing at least one of polyolefin and fluororesin can be used.

  Furthermore, the manufacturing method of the display device of the present invention includes a step of storing the light guide in the frame, a step of disposing the display element above the light guide, and a fixing member having heat shrinkability on the frame and the display element. It was decided to include a step of straddling and a step of heating only the fixing member. According to such a method, since the heat applied to cure and shrink the fixing member does not affect the liquid crystal display panel, high display quality can be maintained.

  The configuration of the liquid crystal display device of this example is schematically shown in FIG. As shown in the figure, this liquid crystal display device includes a liquid crystal display panel 1 in which films such as polarizing plates are disposed on the upper and lower surfaces of a liquid crystal cell, and a backlight device. The backlight device includes a light guide 4 for irradiating a liquid crystal display element with light from an LED. An optical film 3 is disposed on the upper surface of the light guide 4, and a reflective sheet 7 is disposed on the lower surface. And stored in frame 2. Here, the frame 2 is manufactured by injection molding a white resin such as polycarbonate to which a filler is added, and has a structure with a stepped shape or the like so that a light guide plate or the like can be held. The light guide plate 4 is produced by injection molding a transparent resin such as acrylic or polycarbonate, and fine irregularities are formed on the surface thereof. An optical film 3 such as a diffusion sheet or a prism sheet is disposed on the light guide 4 for the purpose of increasing the front luminance of the LCD. Under the light guide 4, light is efficiently transmitted into the light guide. For this purpose, a reflecting plate 7 having a surface coated with a material having a high reflectance such as silver is disposed. The frame 2 and the periphery of the lower surface of the liquid crystal display panel 1 are bonded and fixed with a double-sided fixing tape 5 having a square shape. At the same time, the double-sided fixing tape 5 fixes the light guide 4 and the optical films 3, and also fixes the frame 2 and the light guide 4. The liquid crystal display panel 1 and the frame 2 are fixed so as to straddle both by a fixing member 6 having heat shrinkability. The fixing member 6 is a member obtained by processing, for example, a resin made of polyolefin, fluororesin, or the like, which has a characteristic of being cured and contracted by heating into a sheet shape.

  Here, a method for assembling the liquid crystal display device of this embodiment will be described. First, it arrange | positions so that the reflective film 7, the light guide 4, and the optical films 3 may fall in order on the mold frame 2, and it fixes by sticking the double-sided fixing tape 5 from upper direction. Next, the liquid crystal display panel 1 is dropped, and the peripheral edge of the lower surface is bonded and fixed to the double-sided fixing tape 5. Next, the heat-shrinkable fixing member 6 is installed so as to straddle the mold frame 2 and the liquid crystal display panel 1, and only the fixing member is heated and shrink-hardened to be bonded and fixed. By heating only the fixing member in this way, it is possible to prevent the heat effect on the liquid crystal display panel due to heating.

  As described above, according to the configuration of the present embodiment, even if an external force is applied to the liquid crystal display device and the liquid crystal display panel 1 is peeled upward to be moved, the mold frame 2 and the liquid crystal display panel 1 are applied. Are fixed by the fixing member 6 at the same time, so that lifting is suppressed. That is, even when external stress is applied to the liquid crystal display device, the fixing member can effectively prevent peeling. Further, according to the configuration of the present embodiment, it is not necessary to cover the metal frame from above, so that the liquid crystal display device can be thinned and the cost can be reduced.

  In the above-described embodiments, the resin member is used as the fixing member. However, the material is not limited to the resin, and the same effect can be obtained with a material having heat curing shrinkage characteristics.

  Since a thin and robust liquid crystal display device can be provided, it can contribute to thinning of a mobile phone or the like.

It is sectional drawing which shows typically the structure of the liquid crystal display device which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Frame 3 Optical films 4 Light guide 5 Double-sided fixing tape 6 Fixing member 7 Reflective film

Claims (4)

  Non-self-luminous display element, light source, light guide for guiding light from the light source to the display element, a frame for holding the light guide, and heat shrinkability for fixing the display element and the frame And a fixing member.   The display device according to claim 1, wherein a concave portion is formed in a portion of the frame where the fixing member is provided.   The display device according to claim 1, wherein the fixing member is a sheet material including at least one of polyolefin and fluororesin. Storing the light guide in the frame;
Disposing a display element above the light guide;
Arranging a fixing member having heat shrinkage so as to straddle the frame and the display element;
And heating only the fixing member. A method for manufacturing a display device.

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