JP2003167231A - Display module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display module in which cost reduction is achieved in the fixing structure of the display module using a liquid crystal panel. <P>SOLUTION: The display module is provided with a front frame 1 having an opening part 11, the liquid crystal panel 2 facing the opening part 11, a light source 3 which illuminates the liquid crystal panel 2, a covering member 6 with which the back of the front frame 1 is covered, and an inverter substrate 7 which is arranged behind the covering member 6 and supplies electric power to the light source 3. A projecting part 67 projecting at a side opposite to the liquid crystal panel 2 is provided at the covering member 6, and a fixing part 69 for fixing the inverter substrate 7 is provided at the projecting part 67. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display module fixing structure using a liquid crystal panel.

[0002]

2. Description of the Related Art Conventionally, in a display (liquid crystal) module of this type, as disclosed in, for example, Japanese Patent Laid-Open No. 2000-42205, a front frame having an opening,
A liquid crystal panel facing the opening, a light source made of CFL for illuminating the liquid crystal panel with backlight, a plate-like member made of a light diffusing member interposed between the liquid crystal panel and CFL, and CFL
A metal cover member arranged behind the cover member, an inverter board arranged behind the cover member, and a mounting plate arranged between the inverter board and the cover member, and a penetrating hole formed in the mounting plate. The mounting plate is screwed to the cover member by screws that are screwed from behind the mounting plate through the holes, and the inverter substrate is screwed to the mounting plate by screws that are screwed from behind the inverter substrate through through holes formed in the inverter substrate. As a result, the inverter board is mounted behind the cover member via the mounting plate.

[0003]

However, in the case of the conventional display module, when mounting the inverter board on the back of the cover member, a dedicated mounting plate for mounting the inverter board is separately required, which constitutes the display module. Since the number of parts to be mounted is large, assembly costs and parts costs are high, which is a cause of cost increase.

The present invention has been made in view of this point,
Its main purpose is to provide a display module that can achieve cost reduction.

[0005]

In order to achieve the above object, the present invention has a front frame having an opening, a liquid crystal panel facing the opening, a light source for illuminating the liquid crystal panel, and a back of the front frame. A cover member that covers the cover member and an inverter substrate that is disposed behind the cover member and that supplies electric power to the light source. The cover member is provided with a protrusion that protrudes to the side opposite to the liquid crystal panel side. And a mounting portion for fixing the inverter board.

Further, the present invention is characterized in that the inverter board is fixed to the projecting portion with a screw, and a screwing portion into which the screw is screwed is provided in the mounting portion.

Further, the present invention is characterized in that a plurality of the protrusions are provided.

Further, the present invention is characterized in that the inverter board is arranged substantially parallel to the back surface of the cover member.

[0009]

1 to 5 show a first embodiment of the present invention. Based on these, the present invention will be described below in a display (liquid crystal) module mounted on an operation panel of a copying machine, for example. The case where it is applied will be described. 1 is an exploded perspective view of the display module according to the first embodiment of the present invention, FIG. 2 is a rear view of the display module after assembly in FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. C in FIG.
FIG. 5 is a sectional view taken along the line BB of FIG.

1 to 5, the display module according to the present embodiment includes a front frame 1, a liquid crystal panel 2 arranged behind the front frame 1, and a light source unit (light source) for illuminating the liquid crystal panel 2 with a backlight. ) 3 and
Behind the plate-like member 4, a plate-like member 4 arranged in the illumination path from the light source unit 3 to the liquid crystal panel 2, a resin frame 5 interposed between the plate-like member 4 and the liquid crystal panel 2, The cover member 6 is arranged and covers the back of the front frame 1, and the inverter board 7 is arranged behind the cover member 6.

The front frame 1 is formed by press-molding a plate material made of a metal material into a box shape, and includes a liquid crystal panel 2 and a frame body 5.
And a first caulking piece 12 that is formed in plural at the lower end of each side surface and extends in a substantially “L” shape on the cover member 6 side. And a first caulking portion 13 having a.

The liquid crystal panel 2 comprises a pair of glass substrates 21,2.
A liquid crystal is sealed between the two. On its side part, various circuit parts including a driving IC (not shown) and the TCP film 2
Two circuit boards 24 and 25 provided with 3 are provided so as to be orthogonal to each other. These circuit boards 24, 25 are provided with pattern connecting portions 26 for electrically connecting adjacent portions thereof by means such as soldering. The glass substrates 21 and 22 and the TCP film 23 are thermocompression-bonded and fixed by an anisotropic conductive film. Further, various circuit components including a driving IC on the TCP film 23 and the circuit boards 24 and 25.
And are electrically connected and fixed by means such as soldering.

The light source unit 3 is formed in a line shape along the long side of the liquid crystal panel 2 and is formed of a synthetic resin material having a substantially H-shaped cross section (see FIG. 5).
1, a rubber holder 33 (see FIG. 1) made of, for example, silicon rubber arranged in the recess 32 of the lamp case 31, and a lamp 34 made of a CFL discharge tube held in the recess 32 via the rubber holder 33. And a cord 36 held in the recess 35 of the lamp case 31. In this embodiment, the cord 36 has one end connected to the lamp 34 through a hole provided in each rubber holder 33, and the other end connected to the inverter board 7 for backlight illumination through the connected member 37 (see FIG. 1). Electrically connected. Note that 38 are locking claws that are formed at three locations along the longitudinal direction of the lamp case 31 (see FIG. 2) and that fit with a locking portion of the resin frame 5 described later.

The plate member 4 is a light guide 41 made of an acrylic resin for guiding the light of the lamp 34 to the liquid crystal panel 2,
The light from the lamp 34 and a diffuser plate 42, which is arranged between the light guide 41 and the liquid crystal panel 2, and is made of a PET sheet for uniformizing the light from the lamp 34 from the light guide 41 to the liquid crystal panel 2, P that efficiently reflects the liquid crystal panel 2 side
The reflection plate 43 made of an ET sheet is provided.

The resin frame 5 is made of a synthetic resin material such as ABS and is formed into a frame body having an outer shape that fits with the inner wall surface of the front frame 1, and holds the front frame 1, the liquid crystal panel 2, and the plate member 4. It has a function as a holding body.

The resin frame 5 has an opening window portion 5 for introducing the light uniformized by the diffusion plate 42 to the back of the liquid crystal panel 2.
1 is formed, and a first positioning portion 52 for positioning four corner portions of each glass substrate 21, 22 of the liquid crystal panel 2 is formed outside the opening window portion 51.

A second positioning portion 53 for positioning the inner wall surface of the front frame 1 is formed outside the first positioning portion 52. A frame portion 54 (see FIG. 3) for positioning each plate member 4 on the opposite side of the first positioning portion 52 (on the side of the cover member 6) and the locking claw 38 of the light source unit 3.
And a locking portion 55 (see FIG. 5) that holds the light source unit 3 by being fitted.

Reference numeral 56 denotes two projecting pieces formed so as to be able to be inserted into penetrating portions of the cover member 6, which will be described later. Reference numeral 57 denotes a second caulking piece, which will be described later, of the cover member 6 and an opening step portion 51.
It is two first fixing portions that can be caulked to the side, and the cover member 6 is assembled to the back of the resin frame 5 through the projecting piece 56 and the first fixing portion 57, whereby each plate-shaped member 4 is made of resin. It is stably held between the frame 5 and the cover member 6.

2, 58 are formed corresponding to the four caulking pieces 12 formed on the upper side in FIG. 1 among the caulking pieces 12 of the front frame 1, and these caulking pieces 12 are provided on the cover member 6 side. It is the 2nd fixed part which enables crimping.

The cover member 6 is formed by pressing a plate material made of a metal material, and has a flat plate portion 61 extending in a plate shape so as to cover the back of the front frame 1 and the side of the inverter substrate 7 (the side opposite to the liquid crystal panel 2). To the rear of the lamp case 31 extending in a substantially “L” shape (see FIG. 2).
And a stepped portion 63 extending in a substantially “L” shape on the side opposite to the cutout stepped portion 62 (on the side of the liquid crystal panel 2).

A penetrating portion 64 for holding the stepped portion 63 by inserting projecting pieces 56 of the resin frame 5 in the vicinity of both ends of the stepped portion 63 facing the cutout stepped portion 62 of each stepped portion 63. Is provided.

A second caulking piece is provided on the cover member 6 so as to extend along the side surface of the first fixing portion 57 toward the front frame 1 and to open in a "U" shape with respect to the light source unit 3. The second caulking portion 66 having 65, and the two protruding portions 67 extending obliquely while being recessed toward the inverter board 7 side.
And a hole 68 (see FIG. 4) provided at a substantially central portion of the projecting portion 67.

The projecting portion 67 is formed with a tubular portion extending on the side opposite to the projecting direction (on the side of the liquid crystal panel 2), and a mounting portion 69 communicating with the hole 68 is formed in the tubular portion. As shown in FIG. 4, the mounting portion 69 is provided with a screwing portion 69a formed of a screw thread on the inner wall surface including the hole 68. Further, the mounting portion 69 only needs to be set such that the tip thereof does not come into contact with the reflection plate 43 of the plate member 4 arranged in front of the flat plate portion 61, and in the present embodiment, the height dimension of the protruding portion 67. It is set slightly lower than.

The inverter board 7 is arranged substantially parallel to the flat plate portion 61 of the cover member 6, and is made of, for example, a hard circuit board in which a wiring pattern (not shown) is formed on a glass epoxy base material. A connector (not shown) for converting the voltage, or a connector 7 that is connected to the connected member 37 of the light source unit 3 and supplies power from the transformer to the lamp 34.
1, various circuit parts such as resistors and capacitors (not shown)
Is provided. The connector 71 is arranged behind the inverter board 7, and 72 are two through holes provided corresponding to the holes 68 of the cover member 6 and through which the screws S penetrate, and are formed near both ends of the inverter board 7, respectively. Has been done.

Next, an example of assembling the display module in this embodiment will be described. First, the resin frame 5
The diffuser plate 42, the light guide body 41, and the reflector plate 43, which have substantially the same outer shape, are sequentially stacked in the frame portion 54 from behind.

Next, the back of the resin frame 5 in which the plate member 4 is housed is covered with the cover member 6. At this time, the protruding piece 5
The penetrating portion 64 is incorporated in the protruding piece 56 so that the penetrating portion 6 penetrates behind the stepped portion 63 of the cover member 6, and the second caulking portion 6 is formed.
6 is arranged corresponding to the side surface of the first fixing portion 57, whereby the second caulking piece 65 projecting to the front surface of the first fixing portion 57 is caulked to the opening step portion 51 side, so that the cover is formed. The member 6 is fixed to the resin frame 5.

Next, the liquid crystal panel 2 including the circuit boards 24 and 25 is mounted on the resin frame 5 by positioning the corners of the glass substrates 21 and 22 from the front side of the resin frame 5 to the first positioning portion 52. Held in.

Next, the front surface of the liquid crystal panel 2 is covered with the front frame 1. At this time, the rear corner portion of the front frame 1 is positioned on the second positioning portion 53, and at the same time, the resin frame 5 including the second crimping piece 65 crimped by the first fixing portion 57 is attached to the front frame 1. It will be covered by the inner wall surface. As a result, the first caulking portion 13 of the front frame 1 is connected to the stepped portion 63 of the cover member 6 and the resin frame 5.
The first caulking piece 12 which is disposed corresponding to the side surface of the second fixing portion 58 of the first projecting portion 63 and protrudes behind the step portion 63 and the second fixing portion 58 is located on the side of the inverter board 7 (opening 11).
And the front frame 1 is fixed to the cover member 6 (see FIG. 2).

Next, the lamp case 31 of the light source unit 3
Is installed along the notch step portion 62 of the cover member 6,
The light source unit 3 is housed and fixed in the space surrounded by the plate-shaped member 4, the resin frame 5, and the cover member 6 by engaging and fixing the locking claw 38 in the locking portion 55 (see FIG. 5).

Next, the inverter board 7 is fixed to the back of the cover member 6 by screwing the screw S into the mounting portion 69 through the through hole 72 of the inverter board 7. That is, in the present embodiment, a plurality of protrusions 67 are provided behind the flat plate portion 61 of the cover member 6, and the plate surface of the inverter substrate 7 is directly contacted behind these protrusions 67, whereby the inverter substrate 7 is formed. Is arranged at a position separated from the flat plate portion 61 in accordance with the protruding height dimension of the protruding portion 67, and the screw S
Through the through hole 72, and the mounting portion 69 including the hole 68.
The inverter board 7 is directly fixed to the projecting portion 67 by being screwed and fixed to the screwing portion 69a formed at (see FIG. 4). Then, by inserting the connected member 37 of the light source unit 3 into the connector 71, the assembly of the display module is completed.

As described above, in this embodiment, the opening 11
, A liquid crystal panel 2 facing the opening 11, and a light source unit 3 for illuminating the liquid crystal panel 2.
A cover member 6 for covering the back of the front frame 1 and an inverter board 7 arranged behind the cover member 6 for supplying electric power to the light source unit 3, and the cover member 6 is provided on the side opposite to the liquid crystal panel 2 side. Is provided with a protruding portion 67 protruding to
Mounting portion 6 for fixing the inverter board 7 to the protruding portion 67
By providing 9, the inverter board 7 can be directly fixed to the back of the cover member 6, and a dedicated mounting plate for mounting the inverter board, which has been conventionally required as a component of the display module, is unnecessary. Therefore, the number of parts can be reduced and the cost can be reduced.

Further, in the present embodiment, the inverter board 7 is fixed to the projecting portion 67 with the screw S, and the mounting portion 69 is provided with the screwing portion 69a with which the screw S is screwed. By devising, the inverter board 7 can be fixed to the projecting portion 67 without using the mounting plate, and the work of fixing the mounting plate to the cover member with a screw is unnecessary, so that the number of assembling steps can be reduced. .

When fixing the inverter board 7 to the protruding portion 67, any fixing means other than the screw S can be adopted, and it may be fixed by caulking, for example.

Further, in this embodiment, since the two projecting portions 67 are provided, the inverter board 7 is formed in accordance with the projecting portions 67.
Since the screws are fixed at two locations, the reliability of fixing the inverter board 7 to the cover member 6 can be improved.

Further, in this embodiment, the inverter board 7 is disposed substantially parallel to the back surface of the flat plate portion 61, so that the inverter board 7 can be stably fixed and held behind the cover member 6. .

In this embodiment, the two protruding portions 67 are formed behind the flat plate portion 61, respectively.
The shape of is not limited to this.
The flat plate portions 61 located between the seven may be formed in a substantially trapezoidal shape so as to come into contact with the front surface of the inverter board 7, or may be formed into a convex shape so as to come into contact with the entire front surface of the inverter board 7. May be.

FIG. 6 shows a second embodiment of the present invention. In this embodiment, two cylindrical projecting portions 67 are provided behind the flat plate portion 61, and these projecting portions 67 communicate with the through holes 72. The mounting portion 69 is formed, the inverter board 7 is arranged behind the cover member 6, and the screw S is screwed into the mounting portion 69 from the backside of the inverter board 7 through the through hole 72, whereby the inverter board 7 is formed. The structure is fixed to the cover member 6. In this embodiment as well, the inner wall surface of the mounting portion 69 has a threaded portion 6 made of a screw thread as in the first embodiment.
9a is formed, which allows the screw S to be attached to the mounting portion 69.
Can be fixed by screwing with a screwing portion 69a formed on
The same effects as those of the first embodiment can be expected.

In each of the above-described embodiments, the mounting portion 69 is provided at two places behind the flat plate portion 61, but it may be provided at one place or three or more places in consideration of the outer shape of the inverter board 7. May be.

[0039]

As described above, according to the present invention, it is possible to provide a display module which can achieve the initial object and can achieve cost reduction.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a display module according to a first embodiment of the present invention.

2 is a rear view of the display module after assembly in FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part showing a region C in FIG.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a sectional view of an essential part of a display module according to a second embodiment of the present invention.

[Explanation of symbols]

1 Front frame 2 LCD panel 3 light source unit 4 Plate members 5 resin frame 6 Cover member 7 Inverter board 31 lamp case 34 lamp 36 code 37 Connected member 61 Flat plate part 67 Projection 68 holes 69 mounting part 69a screwing part 71 connector 72 Through hole S screw

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2H089 HA40 KA15 QA12 TA01 TA18                       TA20                 5C094 AA43 AA44 BA43                 5G435 AA17 BB12 BB15 EE02 EE08                       EE23 EE25 EE50 KK02

Claims (4)

[Claims] 1. A front frame having an opening, a liquid crystal panel facing the opening, a light source for illuminating the liquid crystal panel, a cover member for covering the back of the front frame, and a rear member arranged behind the cover member. An inverter board for supplying electric power to the light source is provided, and a projecting portion projecting to the side opposite to the liquid crystal panel side is provided on the cover member, and a mounting portion for fixing the inverter board is provided on the projecting portion. Characteristic display module. 2. The display module according to claim 1, wherein the inverter board is fixed to the protruding portion with a screw, and a screwing portion into which the screw is screwed is provided in the mounting portion. 3. The display module according to claim 1, wherein a plurality of the protrusions are provided. 4. The display module according to claim 1, wherein the inverter board is arranged substantially parallel to the back surface of the cover member.