JP2007121594A - Picture display module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a picture display module which can be made thin without increasing working man-hours, and which is very advantageous as a display of a mobile device that is strongly required to be thin. <P>SOLUTION: The picture display module is so constituted that: engaging hooks 14 are erected respectively on both of the longitudinal side plates 123 of a frame case 1 in which a liquid crystal display panel is stored and held; an FPC 4 conductively jointed to the liquid crystal display panel is folded back along the outer face of the bottom plate 11 of the frame case 1 and its ear part 41 is locked with the corresponding engaging hook 14; the frame case 1 in this state is covered with a shield case 2; and the ear part 41 is pressed and held by each of the inside faces of the shield case side plate 23a and 23c in a state in which the ear part 41 locked with the engaging hook 14 is housed in a groove part 1241 of the frame case side plate 123. Thus, the mounting state wherein the folded back FPC 4 lies along the bottom face of a recessed section 111 of the bottom plate 11 is surely maintained for a long period of time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image display module using a flexible wiring board.

  In recent years, image display modules using flat image display panels (hereinafter referred to as FPD (Flat Panel Display)) such as liquid crystal display panels and organic electroluminescence display panels are advantageous in reducing the thickness of applicable devices. It is often used as a display for mobile devices such as telephones and PDAs (Personal Digital Assistance). However, the demand for miniaturization and thinning is extremely strict for displays of mobile devices, and further thinning of the FPD module is also demanded.

As a measure for promoting thinning of the FPD module, a mounting structure as shown in Patent Document 1 has been proposed. In the mounting structure of the liquid crystal display device, the flexible wiring board bonded to the liquid crystal display panel is folded back to the back side of the frame body in which the panel is accommodated, and is locked by a protrusion standing on the bottom back surface of the frame body However, since the flexible wiring board may be detached from the protrusion due to its own elastic restoring force, the protrusion is melted after the flexible wiring board is locked to the protrusion and welded to the flexible wiring board. To prevent demounting.
JP-A-2003-90993

  However, in the case of the mounting structure in which the above-described locking protrusions are welded, a considerable man-hour is required for the welding work with the flexible wiring board having a difficulty in heat resistance. In order to reduce this man-hour, the protrusion may be an engagement hook whose tip is formed in a hook shape, but in this case, since the tip of the engagement hook protrudes relatively long from the surface of the flexible wiring board, This goes against the demand for thinning the FPD module.

  An object of the present invention is to provide an image display module that can realize a reduction in thickness without increasing the number of manufacturing steps and is extremely advantageous as a display of a mobile device that requires a reduction in thickness.

  An image display module of the present invention comprises an image display panel, a bottom plate and a side plate erected on the periphery thereof, a single-sided opening type case for housing and holding the image display panel, and an external circuit board on the image display panel. And a flexible wiring board for supplying a drive control signal from the case, wherein at least a pair of engaging protrusions are provided on the side plate of the case, and the flexible wiring board includes a plurality of A first connection terminal portion in which wiring and one connection terminal of the plurality of wires are disposed, and a second connection terminal portion in which at least a pair of locking pieces corresponding to the other connection terminal and the engagement protrusion are formed The flexible wiring board is electrically connected to a corresponding connection terminal portion of an image display panel in which the first connection terminal portion is accommodated at a predetermined position in the case. It is pulled out of the case, folded back to the back side opposite to the opening side of the case, and the pair of locking pieces are engaged with the corresponding engaging protrusions. is there.

  According to the image display module of the present invention, the engagement protrusion is provided on the side plate of the case that accommodates the image display panel, and the flexible wiring board joined to the image display panel and folded back along the back of the case is engaged with the engagement protrusion. Since it is configured to stop, the trouble that obstructs the thinning of the module, such as when the engaging projection is erected on the bottom of the case, is avoided, and the direction of the elastic restoring force of the bent flexible wiring board Since the engaging protrusions are erected in the direction intersecting with, the detached flexible wiring board is reliably prevented. Thereby, the flexible wiring board can be securely fixed along the back surface of the case by a simple operation of engaging the locking piece portion of the flexible wiring board with the protrusion. As a result, it is possible to easily manufacture an image display module that is extremely advantageous as a display for a mobile device or the like that is excellent in reliability and is greatly promoted in thinning, and that is strictly required to be thinned out with less man-hours.

  In the image display module of the present invention, the thickness is removed from the outer surface of the bottom plate of the case to form a recess, and at least the second connection terminal portion of the folded flexible wiring board is along the bottom surface of the recess. A configuration in which the image display module is mounted is preferable, and further reduction in thickness of the image display module is further promoted by the depth of the recess.

  The image display module of the present invention further includes a shield case that is mounted on a housing case of the image display panel, and the flexible wiring that is engaged with the engagement protrusion of the case by the shield case that is mounted on the case. It is preferable that the latching piece portion of the substrate is pressed and held, and thereby, the detachment of the flexible wiring substrate from the engagement protrusion is more reliably prevented.

  In addition, the present invention is preferably applied to a liquid crystal display module that is a liquid crystal display panel in which a liquid crystal is sandwiched between a pair of substrates. As a result, the liquid crystal display module is significantly reduced in thickness. Promoted.

  FIG. 1 is a schematic sectional view showing a liquid crystal display module as one embodiment of the present invention, FIG. 2 is a perspective view in which the liquid crystal display module is inverted and disassembled, and FIGS. 3 (a) and 3 (b) are respectively 2 is an enlarged perspective view of the Q portion in FIG. 2, an enlarged perspective view of the Q portion in a completed state, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

  As shown in FIG. 1, the casing of the present liquid crystal display module is configured such that a shield case 2 is mounted on a frame case 1 that serves as a chassis and a storage case. The frame case 1 is formed into a single-sided open type case in which a top plate of a box having a flat outer shape is removed using a resin material, for example, by an injection molding method or the like.

  The shield case 2 is formed into a shape obtained by processing a thin metal plate such as stainless steel and removing the bottom plate of a flat rectangular parallelepiped box having the same outer shape as the frame case 1 and a size larger than that. . A display window 22 for observing the display is formed in the top plate 21 of the shield case 2. As shown in FIG. 2, side plates 23 a to 23 d are individually cut and erected on the four edges of the top plate 21 in which the display window 22 is formed.

  Returning to FIG. 1, in the frame case 1, the front chamber 1 a and the rear chamber 1 b, both of which form a flat rectangular parallelepiped, are formed in two layers with the display viewing side as the front side. That is, a step 13 is formed at a predetermined height position of the side plate 12 erected on the peripheral edge of the rectangular bottom plate 11 (see FIG. 2), and the frame case 1 is divided into two steps with the step 13 as a boundary. The front chamber 1a and the rear chamber 1b overlap each other. Accordingly, the width (area) of the front chamber 1a is wider than the rear chamber 1b by the area of the step 13.

  A liquid crystal display panel 3 is accommodated in the front chamber 1 a of the frame case 1. In the liquid crystal display panel 3, a pair of rectangular glass substrates 31 and 32 on which electrodes (not shown) are formed are bonded to each other with a frame-shaped sealing material 33 so that the respective electrode forming surfaces face each other with a predetermined gap. The liquid crystal 34 is sealed between the opposing surfaces (hereinafter referred to as inner surfaces) of the glass substrates 31 and 32 surrounded by the frame-shaped sealing material 33. A pair of front and rear polarizing plates 35 and 36 are attached to the outer surfaces of the glass substrates 31 and 32, respectively. The liquid crystal display module of the present embodiment is a simple matrix type liquid crystal display module. Each of the opposed inner surfaces of the glass substrates 31 and 32 has a plurality of scanning electrodes (not shown) parallel to each other and orthogonal thereto. A plurality of display electrodes (not shown) parallel to each other are disposed.

  One glass substrate 31 of the glass substrates 31 and 32 has one short edge protruding outside the corresponding end surface of the glass substrate 32 to form a protruding edge 311. On the surface of the protruding edge 311 (extension surface of the electrode forming surface), connection terminals (not shown) of the lead wirings connected to the electrodes of the substrates 31 and 32 are arranged in parallel.

  A flexible wiring board (hereinafter referred to as FPC (Flexible Printed Circuit Board)) 4 for supplying drive control signals is conductively joined to the connection terminal row of the protruding edge 311 described above. The FPC 4 is pulled out of the frame case 1 and folded back to the back side of the bottom plate 11. As shown in FIG. 2, ears 41 are respectively provided on both sides of the end portion of the folded FPC 4. As shown in FIG. 3A, each ear portion 41 is provided with a U-shaped locking hole 412 provided with a tongue piece 411. The FPC 4 includes a driver chip 42 for driving liquid crystal, a connector 43 for electrically connecting a wiring board for electrical connection with an external circuit board, and other circuit elements not shown in the figure, such as a COF (Chip On Film) system. It is mounted directly.

  As shown in FIG. 1, the liquid crystal display panel 3 configured as described above is installed by being fixed by a double-sided pressure-sensitive adhesive sheet 16 at the corresponding step 13 at both longitudinal edges of the rear glass substrate 32.

  A backlight unit 5 is installed in the rear chamber 1b of the frame case 1. The backlight unit 5 of the present embodiment has an LED (Light-Emitting Diode) as a point light source on one short end face 511 side of a transparent light guide plate 51 that has a rectangular shape that roughly corresponds to the liquid crystal display panel 3 to be irradiated. 52 is arranged, an optical sheet laminate 53 is installed on the front surface 512 of the light guide plate 51 facing the liquid crystal display panel 3, and a light reflecting sheet 54 is installed on the rear surface 513 on the opposite side. Yes.

  The LED 52 is mounted directly on the FPC 55 by the COF (Chip On Film) method with its light emission surface 521 in close contact with the light incident surface 511 of the light guide plate 51, and the light source FPC 55 is light on the frame case bottom plate 11. It is arranged adjacent to the reflection sheet 54. The light source FPC 55 is conductively connected to a predetermined portion of the FPC 4 joined to the liquid crystal display panel 3 described above.

  On the light emitting surface (front surface) 512 of the light guide plate 51, an optical sheet laminate 53 as a light control member is installed. The optical sheet laminate 53 is formed by sequentially laminating a lower diffusion sheet 531, a prism sheet 532, and an upper diffusion sheet 533 on the light emitting surface 512.

  On the rear surface 513 of the light guide plate 51, a concentric concave / convex pattern (not shown) for uniformly reflecting the light emitted from the LEDs 52 and incident on the light guide plate 51 toward the front surface 512 is formed. A light reflecting sheet 54 made of a white PET (polyethylene terephthalate) sheet is installed on the rear surface 513.

  In the backlight unit 5 configured as described above, the light emitted from the LED 52 enters the light guide plate 51 from the opposite end surface 511, and this incident light enters the concentric uneven pattern on the rear surface 513. Here, the light is totally reflected toward the front surface 512 and emitted from the front surface 512 in a planar shape. The emitted light passes through the optical sheet laminate 53 and is irradiated onto the liquid crystal display panel 3 as planar irradiation light having a uniform luminance distribution and high front luminance. Note that there is also light that exits the light guide plate 51 after entering the concentric pattern, but the emitted light is reflected by the light reflecting sheet 54 and re-entered into the light guide plate 71, thereby causing the LED 52. The usage efficiency of the light emitted from is greatly improved.

  As shown in FIG. 2, the FPC 4 in which one connection terminal portion is conductively joined to the liquid crystal display panel 3 is outside the frame case 1 from the first notch portion 122 provided on the short side plate 121 of the frame case 1. It is pulled out and folded back to the back side of the bottom plate 11. The first cutout portion 122 is formed by cutting out the central portion of the short side plate 121 over about half of the length, and the bottom plate 11 portion connected to the first cutout portion 122 is cut out over a little width.

  A second notch 124 having a width slightly larger than the width of the ear 41 of the FPC 4 is formed at each predetermined position near the first notch 122 in the pair of long side plates 123. As shown in FIG. 4 and a perspective view corresponding to FIG. 3 showing only the frame case 1, these second notches 124 are formed in the entire leg portion 1231 protruding from the bottom plate 11 of the long side plate 123 and the rear chamber 1 b. Is formed in a shape in which the wall thickness of the chamber wall portion 1232 is removed from the outside by a depth d1. The depth d1 of the groove 1241 formed by removing this thickness is set to a dimension slightly larger than the thickness t of the FPC 4.

  Engagement hooks 14 are erected on the bottom surfaces of the groove portions 1241 in the respective second cutout portions 124. Each engagement hook 14 is fitted with a locking hole 412 of the corresponding ear 41 on the frame case 1 side, and the end of the folded FPC 4 is locked to the outer surface of the frame case 1. Thus, by engaging the engaging hook 14 on the side plate 12 of the shield case 1, the engaging hook 14 is folded in a direction perpendicular to the direction in which the folded FPC 4 returns to its original shape. 14 extends, and as a result, the ear 41 of the FPC 4 is not easily detached from the engagement hook 14.

The front end collar 141 in the engagement hook 14 of the present embodiment is provided so as to protrude toward the foot 1231 side of the side plate 123. The height h of the engagement hook 14 is p, where p is the thickness of the side plate 23a of the shield case 2 to be mounted.
h ≦ d1 + p (1)
Is set to

  In addition, locking claws 15 are provided at both end portions of each long side plate 123 so as to project the shield case 2 mounted thereon. These four locking claws 15 (two on one side are not shown) each have a rectangular parallelepiped shape whose height is substantially the same as the thickness p of the side plates 23a to 23d of the shield case 2. 1 is formed integrally.

  On the outer surface (back surface) of the bottom plate 11, a recess 111 into which an end portion of the folded FPC 4 is fitted is formed by removing the thickness of the bottom plate 11 over a predetermined area on the first notch portion 122 side. ing. The concave portion 111 of the present embodiment is formed in a planar shape that substantially matches the outer shape of the end portion of the FPC 4 to be fitted, and the depth d2 is set to be approximately the same as the thickness t of the FPC 4. In this manner, the depth F2 formed by removing the thickness of the bottom plate 11 from the folded FPC 4 is fitted in the recess 111 substantially the same as the thickness t of the FPC 4 so that the outer surface of the bottom plate 11 is fitted. Compared with the case of superposing and mounting as it is, the thinning of the liquid crystal display module is promoted by the thickness t of the FPC 4.

  In contrast to the frame case 1 formed as described above, in the shield case 2, the pair of long side plates 23a and 23c among the four side plates 23a to 23d are each provided with one slit 24 and two square holes. 25 is formed.

  Each slit 24 is provided in order to avoid contact between the side plates 23a and 23c when the shield case 2 is mounted on the frame case 1 and the respective engagement hooks 14 standing on the corresponding long side plate 123. Therefore, it is formed slightly wider than that at a position corresponding to each engagement hook 14.

  Each square hole 25 is formed in a rectangular shape into which a rectangular parallelepiped locking claw 15 can be fitted at a position corresponding to the four locking claws 15 on the frame case 1 side. When the case 1 is mounted, the four locking claws 15 are fitted into the corresponding square holes 25, so that the shield case 2 is securely fixed to the frame case 1.

Next, a manufacturing and assembling process of the liquid crystal display module configured as described above will be described.
First, after the backlight unit 5 is installed in the rear chamber 1b of the frame case 1, the liquid crystal display panel 3 in which the FPC 4 is conductively bonded is installed in the front chamber 1a.

  Next, the FPC 4 is pulled out from the first notch 122 to the outside of the frame case 1, the drawn-out part is folded back to the back side of the frame case 1, and its end is fitted along the bottom surface of the recess 111 of the bottom plate 11, Each locking hole 412 of both ears 41 is extrapolated to the corresponding engaging hook 14. At this time, each ear portion 41 is bent along the groove portion 1241 of the corresponding second notch portion 124 while being appropriately pulled in a direction away from each other, and each locking hole 412 is extrapolated to the corresponding engagement hook 14. Since the hook part 141 of the engagement hook 14 is projected toward the opening side of the second notch part 122, the hook part 141 corresponds to each locking hole 412 without being obstructed when extrapolated. The engaging hook 14 can be easily extrapolated and engaged. Further, after the extrapolation, as shown in FIG. 3 (a), since the flange 141 overlaps the tongue piece 411, the ear portion 41 bent along the side plate groove portion 1241 is detached. Is blocked. As a result, each locking hole 412 is fully engaged with the corresponding engagement hook 12 by the elastic restoring force of the FPC 4 itself, and the state where the end portion of the folded FPC 4 is fitted in the recess 111 is reliably maintained. Is done.

  Next, the shield case 2 is mounted on the frame case 1 to which the FPC 4 is mounted as described above. In this work, the square holes corresponding to the four locking claws 15 can be obtained by simply sliding the inner surfaces of the side plates 23a to 23d of the shield case 2 corresponding to the outer surfaces of the side plates 121 and 123 of the frame case 1. As shown in FIG. 3 (b), the distal end flange 141 protruding from the ear 41 of the pair of engagement hooks 14 is accommodated in the corresponding slit 24. Thereby, as shown in FIG. 4, each ear 41 of the FPC 4 is pressed and held by the side plates 23 a and 23 c of the corresponding shield case 2 while being accommodated in the corresponding groove 1241 of the frame case 1. Thus, the removal of the ear portion 41 from the engagement hook 14 is reliably prevented. Further, since the height h of the engagement hook 14 is set as in the above formula (1), the tip of the corresponding engagement hook 14 protrudes from the outer surface of each of the shield case side plates 23a, 23c, and the liquid crystal display module of the present invention. Occurrence of a problem that increases the installation space of the applied product is also prevented.

  As described above, in the liquid crystal display module of this embodiment, the engagement hook 14 is erected on the side plate 12 of the frame case 1 that accommodates and holds the liquid crystal display panel 3, and the FPC 4 that is conductively joined to the liquid crystal display panel 3 is attached to the frame case. 1 is folded back and the ear 41 is locked to the corresponding engagement hook 14, so that the engagement hook does not interfere with the thinning of the module unlike the case where the engagement hook is erected on the bottom plate 11, and Since the engaging hook 14 extends in a direction orthogonal to the direction in which the elastic restoring force of the folded FPC 4 is applied, the FPC ear 41 engaged is reliably prevented from being detached, and the folded FPC 4 is used as the case. A mounting state in which the desired thinning along the back surface of the bottom plate 11 is promoted can be easily obtained with good workability and can be securely held for a long time. Further, only by mounting the shield case 2 on the frame case 1, the ear 41 engaged with the engagement hook 14 is pressed and held by the corresponding side plates 23a and 23c of the shield case 2 in a state where the ear 41 is accommodated in the groove 1241. Since the configuration can be made, the mounting state of the FPC 4 in which the above-described thinning is promoted can be reliably maintained for a long time. As a result, it is possible to easily obtain a liquid crystal display module which is excellent in reliability and greatly promoted in thickness reduction and is extremely advantageous as a display for mobile devices that are required to be thinner without increasing the number of manufacturing steps.

In addition, this invention is not limited to said embodiment.
For example, in the above embodiment, the height h of the engagement hook 14 is set as shown in the equation (1) and the tip thereof is not projected from the outer surface of the shield case side plate 23a. In the invention, the engagement protrusion may be protruded from the outer surface of the corresponding shield case side plate, and this may be used as a positioning boss of the installation position in the application device of the image display module.

  The liquid crystal display module of the above embodiment is a transmissive liquid crystal display module having a backlight. However, the present invention is not limited to this, and the present invention is also effective for a reflective liquid crystal display module having no backlight. Applied.

  Furthermore, the frame case is not limited to resin molding, but can be formed by processing a sheet metal material or wood. In the case of processing the sheet metal material, the engagement protrusion may be a simple upright protrusion instead of the hook shape having the collar portion, and the FPC may be bent and then bent to prevent the removal.

  In addition, it goes without saying that the present invention is not limited to the liquid crystal display module but is also effectively applied to other various FPD modules such as an organic EL display module.

It is typical sectional drawing which shows the liquid crystal display module as one Embodiment of this invention. It is a disassembled perspective view which shows the state which turned the said liquid crystal display module upside down and removed the shield case. (A) is the Q section detailed perspective view of Drawing 2, (b) is a perspective view showing the state where the shield case was covered to the Q section. It is the IV-IV sectional view taken on the line in FIG.3 (b). FIG. 4 is a partial detailed perspective view corresponding to FIG. 3 showing only a frame case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame case 11 Bottom plate 12 Side plate 14 Engagement hook 15 Locking claw 2 Shield case 21 Top plate 22 Display window 23a-23d Side plate 24 Slit 25 Square hole 3 Liquid crystal display panel 4 Flexible wiring board (FPC)
41 Ear part 412 Locking hole

Claims (4)

An image display panel;
A single-sided opening type case that accommodates and holds the image display panel, comprising a bottom plate and side plates erected on the periphery thereof;
An image display module comprising a flexible wiring board for supplying a drive control signal from an external circuit board to the image display panel,
At least a pair of engaging protrusions are provided on the side plate of the case, respectively,
The flexible wiring board includes a first connection terminal portion in which a plurality of wires and one connection terminal of the plurality of wires are disposed, at least a pair of locking pieces corresponding to the other connection terminal and the engagement protrusion. A second connection terminal portion formed,
In the flexible wiring board, the first connection terminal portion is conductively joined to a corresponding connection terminal portion of an image display panel accommodated in a predetermined position in the case, and is drawn out of the case. What is the opening side of the case? An image display module, wherein the image display module is folded back to the opposite back side and the pair of locking pieces are engaged with the corresponding engaging protrusions.   A recess is formed on the outer surface of the bottom plate of the case by removing the thickness, and at least the second connection terminal portion of the folded flexible wiring board is mounted along the bottom surface of the recess. The image display module according to claim 1.   A shield case mounted on the case, wherein the locking piece portion of the flexible wiring board engaged with the engagement protrusion of the case is pressed and held by the shield case mounted on the case; The image display module according to claim 1, wherein:   The image display module according to any one of claims 1 to 3, wherein the image display panel is a liquid crystal display panel in which liquid crystal is sandwiched between a pair of substrates.

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