JP2008158268A - Liquid crystal module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem, wherein even though the guide for performing positioning of a liquid crystal panel is provided to a sheet metal-processed frame body on which the liquid crystal panel is placed as in the conventional manner, a curve to be a guide is needed and a large hole from which light is leaked is produced. <P>SOLUTION: In a liquid crystal module having the liquid crystal panel 20, a light source 171, the sheet metal-processed frame body 19 having a placing surface, on which the liquid crystal panel 20 is placed and disposed between the liquid crystal panel 20 and the light source 171 and a back case 11 in which the light source 171 is housed, a second guide 11h, extending over the placing surface of the frame body 19 and abutting against the side surface of the liquid crystal panel 20 to perform positioning of the liquid crystal panel 20 is provided to the back case 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal module in which a liquid crystal panel is placed on a sheet metal processing frame and the liquid crystal panel is positioned by bringing a side surface of the liquid crystal panel into contact with a guide.

  Liquid crystal modules are characterized by light weight, thinness, and low power consumption, and are incorporated in many electronic devices. Many of the liquid crystal modules have a backlight that emits light from behind the liquid crystal panel. For this reason, the display can be seen without relying on outside light, and the display screen can be brightened.

  As shown in Patent Document 1, a general configuration of a liquid crystal module having a backlight is disposed on a light source, a light guide plate that guides light from the light source from the side surface toward the liquid crystal panel, and a bottom surface of the light guide plate. It comprises a reflection sheet, a plurality of optical sheets that diffuse light emitted from the light guide plate, a frame body that restricts the area irradiated on the liquid crystal panel, a liquid crystal panel, and a front case and a back case that house these.

Since the base of the liquid crystal panel is made of glass, there is a high possibility of breakage when screwed with screws. As a holding method for preventing the liquid crystal panel from being damaged, a method of sticking to a frame with a double-sided tape is common. In a normal design, a guide for positioning the liquid crystal panel in contact with the side surface of the liquid crystal panel is provided on the frame on which the liquid crystal panel is placed.
JP-A-11-160681 JP 2002-17811 A Japanese Patent Laid-Open No. 5-66390

  However, when the frame is made of a metal sheet metal material in order to reduce the thickness of the liquid crystal module (see Patent Document 2), as shown in FIG. 12 of Patent Document 3, it is also referred to as cutting or lancing. At the same time, a hole is formed in order to form a bend in the guide, for example, by forming a bend. There was a problem that light leaked from this hole.

In order to solve the above problems, the liquid crystal module according to claim 1 of the present invention includes a liquid crystal panel, a light source, and a mounting surface on which the liquid crystal panel is mounted. In a liquid crystal module having a sheet metal processing frame disposed between and a back case in which the light source is stored,
The back case is provided with an extending portion that extends beyond the mounting surface of the frame and contacts the side surface of the liquid crystal panel to position the liquid crystal panel.

  Further, the invention of the liquid crystal module according to claim 2 of the present invention is characterized in that a square hole is provided in the frame body, and the extending portion of the back case passes through the frame body through the square hole. And

According to the first aspect of the present invention, the extending portion for positioning the liquid crystal panel is not mounted on the sheet metal processing frame on which the liquid crystal panel is mounted, but on the frame mounted by the back case separated from the liquid crystal panel. It extends beyond the mounting surface. Thereby, it can prevent that light leaks from the big hole for forming the extension part in a frame.

  According to claim 2 of the present invention, the hole in the sheet metal processing frame is not a large hole for forming a guide in contact with the liquid crystal panel, but a small square hole through which the extended portion of the back case passes. Thereby, the light which leaks from the hole of a frame can be decreased.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a liquid crystal module for embodying the technical idea of the present invention, and is not intended to specify the present invention for this liquid crystal module. Other embodiments within the scope are equally applicable.

  1 is a front perspective view of a liquid crystal module according to an embodiment of the present invention, FIG. 2 is a rear perspective view, FIG. 3 is a front view, and FIG. 4 is a right side view. 5 is a rear view, and FIG. 6 is a cross-sectional view taken along line AA of FIG. 3 or FIG. 1 to 5 are perspective views of the front case to show a second guide for positioning the liquid crystal panel. However, in FIG. 6, the front case is illustrated by a two-dot chain line.

  As shown in FIG. 6, the liquid crystal module 1 of the present invention includes a box-shaped back case 11 opened upward in FIG. 6, a reflection sheet 12, a light guide plate 13, a lens sheet 14 in the X direction, and a lens sheet 15 in the Y direction. The flexible printed circuit board 17 having the LED 171 serving as the light source is adhered to the side wall 11b of the back case 11 with a double-sided tape 18 having excellent thermal conductivity. The LED 171 is disposed so as to face the side surface 13 a that is the incident surface of the light guide plate 13. A frame 19 having an opening 19c as an exit window engages with the back case 11 and closes the storage of the back case 11.

  As shown in FIG. 6, the liquid crystal panel 20 is adhered to the frame body 19 with the double-sided tape 21, and the front case 22 is engaged with the frame body 19 so as to overlap the liquid crystal panel 20. A control board 23 is screwed to the outside of the bottom 11 a of the back case 11 with screws 24. The front case 22 is provided with a display window 22a.

  The control board 23 outputs a power supply voltage, a control signal, and RGB signals to the gate driver 20a and the source driver 20b of the liquid crystal panel 20 to control the image, and supplies power to the printed board 17 for the LED 171. As shown in FIG. 2, the control board 23 includes a first connector 23a to which the flexible printed board 20c of the liquid crystal panel 20 is connected, a second connector 23b to which the printed board 17 for the LED 171 is connected, and other electronic components. It has an I / F connector 23c connected to the device.

  The light emitted from the LED 171 of the flexible printed circuit board 17 held on the side surface of the back case 11 is incident from the side surface 13a of the light guide plate 13, reflected by the reflection sheet 12, and emitted from the output surface 13b of the light guide plate 13. The back surface of the liquid crystal panel 20 is irradiated through the opening 19 c of the frame 19 through the lens sheet 14 in the X direction, the lens sheet 15 in the Y direction, and the diffusion sheet 16.

FIG. 7 is a perspective view showing a state in which the frame body 19 is removed from the back case 11, and FIG. 8 is a perspective view of the back case 11 seen from the back side. The back case 11 is formed in a box shape with one side opened by sheet metal processing of an aluminum plate material, and includes a bottom portion 11a and a side wall 11b formed on the periphery of the bottom portion 11a. The bottom portion 11a has three first guides 11c (one on the top and two on the left and right in the direction of FIG. 8) for contacting and positioning the side surface of the control substrate 23. Three projections 11d for regulating the gap between the back cases 11 (one on the upper side and two on the left and right in the direction of FIG. 8), and a first attachment for screwing the control board 23 with screws 24 There are three parts 11e (two in the direction of FIG. 8 and one in the center), and there are two second attachment parts 11f for screwing the liquid crystal module 1 to other electronic devices with screws ( 8 in the direction of FIG. The side wall 11b has eight protrusions 11g (four in the vertical direction and four in the right and left in the direction of FIG. 8) for engaging with the frame body 19, and abuts the side surface of the liquid crystal panel 20 for positioning. There are three second guides 11h (two on the top and one on the left in the direction of FIG. 8).

  The frame body 19 is formed into a box shape with one side opened by sheet metal processing of a stainless steel plate material, and includes a top portion 19a and a side wall 19b formed on the periphery of the top portion 19a as shown in FIG. The top portion 19a has three openings 19c as the exit window and three first square holes 19d through which the second guide 11h extending from the back case 11 passes (two on the top and one on the left in the direction of FIG. 7). )is there. The side wall 19b has eight second square holes 19e that engage with the back case 11 (four vertically and four horizontally in the direction of FIG. 7), and six convex portions 19f that engage with the front case 22. There are two (two on the top and four on the left and right in the direction of FIG. 7).

  As shown in FIG. 6, the three second guides 11 h of the back case 11 pass through the first square holes 19 d of the frame body 19 and extend beyond the top portion 19 a of the frame body 19, and the liquid crystal panel 20 has a reference surface 11i for contact with the side surface of 20 for positioning. The liquid crystal panel 20 is attached by adhering the liquid crystal panel 20 to the top portion 19a of the frame 19 with the double-sided tape 21 while the liquid crystal panel 20 is in contact with the three reference surfaces 11i.

  A reference surface 19i 'for positioning the conventional liquid crystal panel 20 is provided on a frame 19' on which the liquid crystal panel 20 is placed, as shown in FIG. In this case, since the reference surface 19i 'is formed by bending, there is a problem that a hole 19j' is formed and light leaks from the hole 19j '.

  In the case of the present application, light leaks from the gap between the first square hole 19d of the frame body 19 and the second guide 11h of the back case 11. Then, the area where light leaks is very small.

  In addition, although the above-mentioned light source was LED, this application is applicable about a fluorescent discharge tube.

  In addition, the above-described liquid crystal panel holding method is adhesive with a double-sided tape, but the present invention can also be applied to other methods, for example, an urging means for urging in the reference surface direction and screwing with a screw. it can.

It is a perspective view of the front direction of the liquid crystal module concerning one embodiment of the present invention. It is a perspective view of the back direction which shows a liquid crystal module. It is a front view which shows a liquid crystal module. It is a right view which shows a liquid crystal module. It is a rear view which shows a liquid crystal module. It is AA sectional drawing of FIG. 3 or FIG. It is a perspective view which shows the state which removed the frame from the back case. It is the perspective view which looked at the back case from the back side. It is sectional drawing which shows the reference plane for positioning the conventional liquid crystal panel.

Explanation of symbols

1 Liquid crystal module 11 Back case 11e First mounting portion (for control board)
11f 2nd attachment part (for liquid crystal modules)
11h Second guide (for positioning LCD panel)
11i Reference surface (for positioning LCD panel)
12 Reflective sheet 13 Light guide plate 14 Lens sheet (X direction)
15 Lens sheet (Y direction)
16 Diffusion sheet 17 Flexible printed circuit board (LED)
171 LED
18 Double-sided tape 19 Frame 19d Square hole (for reference surface)
20 Liquid crystal panel 20c Flexible printed circuit board (liquid crystal panel)
21 Double-sided tape 22 Front case 23 Control board 23a First connector (for flexible printed circuit board of liquid crystal panel)

Claims (2)

A liquid crystal panel, a light source, a sheet metal processing frame having a mounting surface on which the liquid crystal panel is mounted and disposed between the liquid crystal panel and the light source, and a back case in which the light source is stored. In the liquid crystal module having
The liquid crystal module according to claim 1, wherein the back case is provided with an extending portion that extends beyond the mounting surface of the frame and contacts the side surface of the liquid crystal panel to position the liquid crystal panel.   The liquid crystal module according to claim 1, wherein a square hole is provided in the frame body, and the extending portion of the back case passes through the frame body through the square hole.

Images