JP2006235135A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a display element falls from a frame holder in a display device using the frame holder storing the display element and an FPC substrate as a force is applied to bonded portions of the frame holder and display element owing to a reaction force generated at a folded portion of an FPC. <P>SOLUTION: The external shape of a polarizing plate 10 to be stuck on the top surface of a liquid crystal panel is made large and the liquid crystal panel is bonded and fixed to the top surface of the external shape of the frame holder 30 by using the polarizing plate. Consequently, the adhesive strength increases without making the frame holder large to prevent the bonded portions from peeling. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device such as a simple matrix or an active matrix used for a mobile phone, for example.

A conventional display device uses a liquid crystal panel in which a liquid crystal is sandwiched between two glass substrates and an optical film of a polarizing plate is attached to the surface thereof. A driver IC is COG mounted on the liquid crystal panel, and an input signal to the driver IC is supplied from an FPC connected to a circuit board. A backlight composed of a light guide plate, a lens and a film having a diffusion function is housed in a frame holder, a liquid crystal panel is fixed to the area including the outer periphery of the backlight and the frame holder with a double-sided tape, and an FPC is bent on the back surface of the circuit. The board was fixed with double-sided tape. The display device has been required to have a narrower frame than the size of the mobile phone. As an assembling method, a structure in which a liquid crystal panel, a circuit board, and the like are assembled by bonding and fixing to a frame holder with a double-sided tape is known (for example, see Patent Document 1).
Japanese Unexamined Patent Publication No. 2004-157471 (page 7, FIG. 1)

  In the conventional configuration, the repulsive force generated at the FPC bending portion applies force to the double-sided tape and the liquid crystal panel bonding portion that are bonded to the frame holder. There has occurred. In other words, in the configuration in which the liquid crystal panel and the circuit board are bonded to the frame holder with the double-sided tape, the double-sided tape has a narrow adhesive width, and thus peeling occurs, resulting in incomplete assembly of the display device and frequent failures. Increasing the width of the double-sided tape leads to an increase in the size of the frame holder, making it impossible to achieve the outer shape required from a mobile phone.

  In the present invention, the outer shape of the polarizing plate attached to the upper surface of the liquid crystal panel is enlarged and directly bonded and fixed to the upper surface of the outer shape of the frame holder. By bonding and fixing the polarizing plate and the frame holder, the force for suppressing the repulsive force of the FPC is increased, and it becomes possible to prevent the frame holder and the liquid crystal panel or the circuit board from being peeled off.

  Adhering and fixing the outer shape of the polarizing plate affixed to the glass substrate of the display panel and the outer shape of the frame holder increases the area of the adhesive part, solves the problem of peeling of the liquid crystal panel and peeling of the circuit board, and is stable Assembling becomes possible and the yield is improved.

  According to the configuration in which the FPC connected to one end of the liquid crystal panel is bent and the repulsive force of the bent portion affects the display device, the liquid crystal panel is bonded and fixed to the frame holder using a polarizing plate as in the present invention. The effective area of adhesion is expanded, the internal repulsion force is suppressed, the liquid crystal panel is not lifted, and the display quality is stabilized. Furthermore, if the deflection plate covers the entire upper surface of the frame holder, it is possible to prevent light from entering and prevent erroneous display of the display device. As described above, according to the method of assembling by bonding and fixing the polarizing plate to the frame holder at the end of the assembly part, it is possible to stably assemble the display device even if there is a repulsive force generated at the bent portion of the FPC. .

  The configuration of the display device of this example is schematically shown in FIGS. As shown in FIG. 1, the first liquid crystal panel 20 is incorporated in the frame holder 30. The first polarizing plate 10 is bonded and fixed so as to cover the upper surfaces of the three outer sides of the frame holder 30. According to such a configuration, the repulsive force of the first FPC 70 can be pressed into the frame holder 30 by the adhesive force of the first polarizing plate 10, and the first liquid crystal panel 20 can be prevented from floating.

  Next, a method for manufacturing the display device described above will be described. First, as shown in FIG. 2, the first liquid crystal panel 20, the first FPC 70, the circuit board 50, and the light guide plate 40 are set in the frame holder 30. The first polarizing plate 10 is cut in advance to the same size as the three sides of the outer size of the frame holder 30, and is bonded and fixed to the three sides of the frame holder 30.

  The configuration of the display device of this embodiment is shown in FIG. As illustrated, the first polarizing plate 10 is bonded and fixed so as to cover the upper surfaces of the four outer sides of the frame holder 30 in which the first liquid crystal panel 20 is incorporated. According to such a configuration, there is an effect of preventing light from entering and preventing erroneous display of the display device. Since other configurations are the same as those of the first embodiment, details are omitted.

  The configuration of the display device of this example is shown in FIG. As shown in FIG. 4, the first liquid crystal panel 20 and the second liquid crystal panel 60 are incorporated in the frame holder 30. The first polarizing plate 10 and the second polarizing plate 80 are bonded and fixed so as to cover the upper and lower surfaces of the four outer sides of the frame holder 30. According to such a configuration, the first liquid crystal panel 20 and the second liquid crystal panel 60 do not float due to the repulsive force of the first FPC 70 and the second FPC 90 and can simultaneously realize the light shielding of the driver IC.

  It can be used for a display device in which a display panel is fixed by using a frame holder, and it is possible to achieve both downsizing of portable electronic devices such as mobile phones and improvement of display quality.

It is sectional drawing which shows typically the structure of the liquid crystal display device of this invention. It is a top view which shows typically the structure of the liquid crystal display device of this invention. It is a top view which shows typically the structure of the liquid crystal display device of this invention. It is sectional drawing which shows typically the structure of the liquid crystal display device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st polarizing plate 20 1st liquid crystal panel 30 Frame holder 40 Light guide plate 50 Circuit board 60 2nd liquid crystal panel 70 1st FPC
80 Second polarizing plate 90 Second FPC

Claims (3)

LCD panel,
A film substrate for supplying a driving signal to the liquid crystal panel;
While incorporating the liquid crystal panel, a frame holder with the film substrate fixed to the back surface,
A polarizing plate provided on the surface of the liquid crystal panel,
A liquid crystal display device, wherein the liquid crystal panel and the frame holder are bonded and fixed using the polarizing plate.   The liquid crystal display device according to claim 1, wherein the polarizing plate is provided so as to cover the entire surface of the frame holder.   A second liquid crystal panel on the back side of the liquid crystal panel and a second polarizing plate provided on the surface of the second liquid crystal panel, and the second liquid crystal panel and the frame using the second polarizing plate The liquid crystal display device according to claim 1, wherein the holder is bonded and fixed.

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