JP2010085638A - Liquid crystal display module and electronic apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display module capable of preventing cracks of substrates even when the substrates clamping liquid crystal is thinned and to provide an electronic apparatus using the liquid crystal display module. <P>SOLUTION: In the liquid crystal display module, a liquid crystal display panel 1 and a backlight 2 are stored in a front room 3a and a rear room 3b of a frame 3, respectively. In the liquid crystal panel 1, the edge side of a rear polarizing plate 16 is supported by a step face 32 formed on a side plate 31 of the frame 3, and thereby a support space S1 with height corresponding to the thickness of the rear polarizing plate 16 is secured between a monolithic plate 121 of the liquid crystal display panel 1 and the step face 32 supporting the monolithic plate. Further in the liquid crystal display module, a corner C of the frame 3 on the outer surface of the monolithic plate side is chamfered like a triangular pyramid, and while liquid crystal display module is fitted into a recess 41 of a base plate 41 of a display of an applied apparatus, a chamfered space S2 is secured between the module and the recess 41. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display module and an electronic device such as a mobile phone to which the liquid crystal display module is applied.

  In recent years, liquid crystal display panels have been used as displays for mobile devices such as mobile phones and PDAs (Personal Digital Assistance) because they are advantageous for thinning applied devices.

Usually, in a liquid crystal display module that uses a liquid crystal display panel as a display, a single plate portion is formed by projecting a part of the end face of one of the pair of substrates holding the liquid crystal from the corresponding end face of the other substrate. Then, the wiring of each electrode for driving the liquid crystal is drawn out to this single plate portion, and the respective connection terminals are arranged in parallel. From this parallel terminal portion, an external member is connected via a wiring member such as an FPC (Flexible Printed Circuit). The wiring is connected to the drive control circuit board. Here, as shown in Patent Document 1, in the case of a COG (Chip On Glass) type liquid crystal display panel in which a glass plate is used as a substrate and a driver chip for driving a liquid crystal is directly mounted on the glass substrate, the above-mentioned one piece is used. Since the driver chip is directly mounted on the plate portion, the area of the single plate portion is secured as much.
JP 2006-235303 A

  Today, mobile devices are strongly demanded to be small and thin, and liquid crystal display modules as their displays are required to be further thinned. In order to reduce the thickness of the liquid crystal display module, it is inevitable to reduce the thickness of the substrate of the liquid crystal display panel, which has a large proportion of the total thickness.

  However, when the substrate is thinned, there is a problem that the substrate is easily broken when an external force is applied to the liquid crystal display module.

  In particular, in the case of a COG type liquid crystal display module in which a glass substrate is used as the substrate and the area of the single plate portion is relatively large, the glass substrate of the single plate portion is more likely to break.

An object of the present invention is to provide a liquid crystal display module that prevents a single plate portion of a substrate that sandwiches liquid crystal from cracking, and an electronic device using the liquid crystal display module.

  The invention of the liquid crystal display module according to claim 1 of the present invention is characterized in that the liquid crystal is sandwiched between the front substrate positioned on the display viewing side and the rear substrate positioned on the back side, and at least a part of the end surface of the rear substrate. A liquid crystal display panel provided with a single plate portion projecting from a corresponding end surface of the front substrate, and a frame body that accommodates and supports the liquid crystal display panel, and the frame body and at least the rear side A space is secured between the substrate and the single plate portion protruding from the front substrate.

  According to a second aspect of the present invention, in the liquid crystal display module according to the first aspect, a polarizing plate is disposed on an outer surface of the rear substrate opposite to a side where the liquid crystal is sandwiched, and an edge of the polarizing plate is the frame body. A space having a height corresponding to the thickness of the polarizing plate is secured between the single plate portion and the support surface of the frame.

  According to a third aspect of the present invention, in the liquid crystal display module according to the first aspect, the liquid crystal display panel has a rectangular shape at positions corresponding to at least four corners of the front substrate on the outer surface of the rear substrate. The frame body is provided with a protrusion that directly contacts the distal end surface.

  According to a fourth aspect of the present invention, in the liquid crystal display module according to any one of the first to third aspects, the front substrate and the rear substrate are both glass substrates. To do.

  According to a fifth aspect of the present invention, there is provided an electronic apparatus in which a liquid crystal is sandwiched between a front substrate positioned on a display viewing side and a rear substrate positioned on a back side, and at least a part of the end surface of the rear substrate. A liquid crystal display panel provided with a single plate portion projecting from a corresponding end surface of the front substrate, and a liquid crystal display module housed in a frame body having a substantially rectangular parallelepiped shape; and the liquid crystal display module is fitted A base having a recessed portion, and at least a corner portion of the outer surface of the frame corresponding to a single plate portion protruding from the front substrate of the rear substrate in the liquid crystal display panel, A space is secured between the inner surface of the concave portion.

  According to a sixth aspect of the present invention, in the electronic device according to the fifth aspect, between the frame body in the liquid crystal display module and a single plate portion that protrudes from at least the front substrate of the rear substrate. It is characterized in that a space is secured.

  According to a seventh aspect of the present invention, there is provided an electronic device in which a liquid crystal is sandwiched between a front substrate positioned on a display viewing side and a rear substrate positioned on a rear surface, and at least a part of the end surface of the rear substrate. A liquid crystal display panel provided with a single plate portion projecting from a corresponding end surface of the front substrate, a liquid crystal display module housed in a frame, the liquid crystal display module is installed, and the rear substrate And a base having an opening formed at a position corresponding to the single plate protruding from the front substrate.

  According to an eighth aspect of the present invention, in the electronic device according to the seventh aspect, a space is secured between the frame body and at least the one plate portion in the liquid crystal display module. Is.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid crystal display panel which prevented the crack of the board | substrate of a single-plate part, and the electronic device reduced in thickness using this structure can be provided.

  FIG. 1A is a plan view showing a display unit of a mobile phone equipped with a liquid crystal display module as one embodiment of the present invention, and FIG. 1B is a sectional view taken along the line BB in FIG.

  The liquid crystal display module of the present embodiment is accommodated and held at a predetermined position of the frame 3 in an arrangement in which the liquid crystal display panel 1 and the backlight 2 are superposed on each other.

  The liquid crystal display panel 1 has a pair of rectangular glass substrates 11 and 12 on which electrodes (not shown) are formed, and a predetermined gap is maintained by a frame-shaped sealing material (not shown) with the electrode forming surfaces facing each other. The liquid crystal (not shown) is sealed between the glass substrates 11 and 12 surrounded by a frame-shaped sealing material. Of these glass substrates 11 and 12, one end surface of the rear glass substrate 12 that is disposed on the side opposite to the viewing side of the display is made to protrude by an appropriate length from the corresponding end surface of the front glass substrate 11. Is formed.

  A driver chip 13 for driving the liquid crystal is directly mounted on the single plate portion 121 by a COG (Chip On Glass) method. Further, the flexible wiring board 14 is conductively joined to the connection terminal array portion of the input signal wiring formed on the protruding edge portion of the single plate portion 121. The other end of the flexible wiring board 14 is electrically connected to an external drive control circuit board (not shown). Therefore, a display drive control signal from the outside is input to the driver chip 13 via the flexible wiring board 14 and the input signal wiring on the single plate portion 121 (not shown), and is output from the driver chip 13 accordingly. Drive signal voltage is applied to each electrode through an output wiring (not shown) drawn from each electrode.

  A pair of front and rear polarizing plates 15 and 16 are attached to the outer surfaces of the pair of front and rear glass substrates 11 and 12 opposite to the liquid crystal sealing side, respectively.

  The backlight 2 of the present embodiment is a side-light type surface emitting irradiation panel, and an LED as a light source is provided on one short end face of a transparent light guide plate 21 having a rectangular shape substantially corresponding to the liquid crystal display panel 1 to be irradiated. (Light-Emitting Diode) 22 is mounted directly on a flexible wiring board (hereinafter referred to as a light source mounting FPC) 23 by a COF (Chip On Film) method, and is disposed on a front surface 211 of the light guide plate 21 facing the liquid crystal display panel 1. An optical sheet laminate 24 in which prism sheets 241 and 242 and a light diffusion sheet 243 are laminated is installed, and a light reflection sheet 25 is installed on the rear surface 212 on which minute concavities and convexities are formed on the opposite side. Has been.

  In the surface emitting irradiation panel 2 configured as described above, the light emitted from the LED 22 enters the light guide plate 21 from its facing end surface (light incident end surface), and this incident light forms minute irregularities. The inner surface is reflected by the rear surface 212 toward the front surface (light emitting surface) 211 and is emitted from the front surface 211 into a planar shape. The light emitted in a planar shape from the front surface 212 is transmitted through the prism sheets 241 and 242 and the light diffusion sheet 243, thereby becoming a planar light having a substantially uniform luminance distribution and a high luminance in the front direction. The panel 1 is irradiated.

  The above-described liquid crystal display panel 1 and the above-described surface-emitting irradiation panel 2 are accommodated at predetermined positions of the frame 3 and are held by a double-sided adhesive sheet or the like (not shown). The frame 3 is made of a resin material and is collectively molded into a two-stage accommodation chamber type in which a rectangular parallelepiped front chamber 3a and rear chamber 3b are overlapped and formed with a flat space outline.

  As shown in the perspective view of FIG. 2 showing the frame 3, in this frame 3, the step surface 32 is formed at a predetermined height position of the side plate 31 surrounding the space of the rectangular parallelepiped. It is formed wider than the rear chamber 3 b by the area of the stepped surface 32. Thus, the rigidity of the frame 3 is enhanced by providing the step surface 32 on the side plate 31.

  In addition, one short side plate portion 311 of the side plate 31 is formed in an L-shaped cross-sectional shape having substantially no step, and the height thereof is a predetermined dimension than the side plate portion 312 surrounding the other three sides. A notch 313 is formed at one end of the low-profile side plate 311. Further, a notch portion 314 is also formed in the center portion of the side plate portion facing the low-back side plate portion 311 in the side plate portion 312 surrounding the three sides.

  Then, both lower corners C and C on the low-back side plate portion 311 side are cut out in a triangular pyramid shape on the outer surface of the frame 3 whose outer shape is substantially a rectangular parallelepiped shape. The chamfered corner portion C cut into a triangular pyramid shape is provided in order to secure an escape space for allowing deformation such as bending due to an external force of the liquid crystal display module.

  The liquid crystal display panel 1 is accommodated and held in the upper front chamber 3a having a large area of the frame 3 formed as described above, and the surface emitting panel 2 is accommodated and held in the lower rear chamber 3b. Necessary gaps are ensured. Then, as shown in FIG. 1A, the flexible wiring board 14 for inputting an external drive control signal is provided from the upper part of the low-profile side plate part 311, and the light source mounting FPC 23 is provided outside the frame 3 from the notch part 313. The end portion of the light source mounting FPC 23 that has been drawn out and drawn out is conductively connected to the flexible wiring board 14. Note that the notch 314 on the opposite side accommodates a protrusion 17 made of a sealing material that seals the liquid crystal inlet of the liquid crystal display panel 1 accommodated and supported in the front chamber 3a.

  Here, the liquid crystal display panel 1 is accommodated in the front chamber 3 a in a state where the three edge portions excluding the single plate portion 121 are supported by the corresponding step surfaces 32 of the frame 3. Specifically, the arrangement is such that the three edges excluding the edge facing the single plate portion 121 of the rear polarizing plate 16 are in contact with the corresponding step surface 32. Therefore, the single plate portion 121 of the glass substrate 12 is not entirely in contact with the step surface 32, and the height corresponding to the thickness of the rear polarizing plate 12 is between the step surface 32 that supports the liquid crystal display panel 1. A space S1 is secured.

  In this way, the supporting surface S 1 is not brought into contact with the single plate portion 121 of the glass substrate 12, and the supporting space S 1 is secured between the single plate portion 121 and the supporting surface, that is, the stepped surface 32. It is possible to effectively prevent cracking due to the external force of the single plate portion 121 that is likely to occur due to the thinning. That is, when the liquid crystal display panel 1 is bent by an external force, there is a space S1 on the rear side of the single plate portion 121 that is most vulnerable to deformation, so that even if the frame corresponding to the single plate portion 121 is deformed, The single plate portion 121 is prevented from cracking without being deformed in the space S <b> 1 and an external force not being transmitted to the single plate portion 121.

  As described above, the liquid crystal display module in which the liquid crystal display panel 1 and the surface emitting irradiation panel 2 are accommodated and held in the front and rear chambers 3a and 3b, respectively, as described above is a base plate provided in a display unit of a mobile phone. 4 is fitted in the recess 41. Here, when an external force such as bending is applied to the mobile phone, a triangular pyramid-shaped chamfering space S2 is formed between the double-sided corner C of the outer surface of the liquid crystal display module and the corresponding corner of the base plate recess 41. Therefore, the deformation of the liquid crystal display module is absorbed by the chamfering space S2, the deformation of the single plate portion 121 in the liquid crystal display panel 1 is relaxed, and the crack of the single plate portion 121 is effectively prevented. .

  As described above, in the present embodiment, the three side edges excluding the single plate portion 121 of the liquid crystal display panel 1 accommodated in the front chamber 3 a of the frame 3 are stepped via the edge portion of the rear polarizing plate 16. 32, a space S1 having the same height as the thickness of the rear polarizing plate 16 is secured between the single plate portion 121 and the support surface (step surface) 32 of the frame 3, and further, the one of the liquid crystal display modules is provided. Since the chamfering space S2 is secured between the frame outer surface corner portion C on the plate plate portion 121 side and the corresponding corner portion of the module fitting recess 41, even if an external force such as bending acts on an applicable device such as a cellular phone. The deformation of the liquid crystal display module due to the external force is absorbed and relaxed by the chamfering space S2, and the deformation of the liquid crystal display panel 1 via the liquid crystal display module due to the external force is absorbed and relaxed by the support space S1, so that the external force is a single plate. It is not transmitted to part 121.

  Therefore, even when the liquid crystal display module in which the glass substrate of the liquid crystal display panel is further thinned and the electronic device such as a mobile phone using the same is thinned, the glass substrate is prevented from being cracked due to deformation such as bending due to external force. Both improvement and robustness can be achieved.

  Next, another embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the component same as the said embodiment, and the description is abbreviate | omitted.

  In the present embodiment, the three edges other than the edge facing the single plate portion 121 of the rear polarizing plate 16 in the liquid crystal display panel 1 are not supported by the corresponding step surfaces 52 of the frame 5, and the liquid crystal display panel 1. The four projections 53 erected on the step surface 52 so as to correspond to the four corners of the front glass substrate 11 are configured to directly support the four points on the edge of the rear glass substrate 12.

  Therefore, also in the present embodiment, the support space S3 is secured between the single plate portion 121 and the step surface 52. The height of the support space S3 is determined by the height of the protrusion 53. Yes. That is, the height of the support space S3 for absorbing the relative displacement of the single plate portion 121 due to the deformation of the frame can be set to a desired height regardless of the thickness of the rear polarizing plate 16. It becomes.

  And the said liquid crystal display module is installed on the base board 6 of the display part in application apparatuses, such as a mobile telephone. An opening 61 is formed at a position corresponding to the single plate portion 121 of the base plate 6.

  A drive control circuit board 62 for driving the liquid crystal display module is installed on the back surface of the base plate 6 opposite to the liquid crystal display module installation side, and the flexible wiring board 14 drawn out from the liquid crystal display module It is folded back to the back side of the base plate 6 through the opening 61, and its end is electrically connected to the drive circuit control 62 via the connector 63.

  Also in the case of the liquid crystal display module application device of the present embodiment configured as described above, as in the above-described embodiment, cracking due to external force of the single plate portion 121 that is likely to occur due to thinning of the glass substrate 12 is effective. Can be prevented. That is, even if bending deformation occurs in the base plate 6 due to an external force applied to the applied device, the bending stress acts on the portion on the single plate portion 121 side of the liquid crystal display module due to the presence of the opening 61. Furthermore, since the bending deformation of the single plate portion 121 that is most likely to be deformed even if bending deformation occurs in the liquid crystal display module due to the external force is absorbed by the support space S3, the glass substrate 12 that has been promoted to be thinned. Even if it exists, the crack is effectively prevented. Furthermore, in the case of the present embodiment, as shown in FIG. 4C, the contact portion of the protrusion 53 is also provided between the edge other than the single plate portion 121 of the rear glass substrate 12 and the step surface 52. Except for the support space S4 having the same height as the support space S3, the bending deformation of the entire liquid crystal display panel 1 is absorbed by the support spaces S3 and S4, and the glass substrates 11 and 12 are more reliably broken. Is prevented.

In addition, this invention is not limited to said embodiment.
For example, as shown in FIG. 4, the present invention is also effective when the liquid crystal display panel 7 is of a type in which the end surfaces of two adjacent sides of the rear glass substrate 72 are protruded from the corresponding end surfaces of the front glass substrate 71. Applies to

  In this embodiment, a plurality of driver chips 73 are COG mounted at predetermined positions on a single L-shaped plate portion 721, and external drive control is performed on each edge portion provided with input wiring terminals to the driver chips 73. The flexible wiring boards 74 and 74 for circuit connection are each conductively joined.

  A step surface 82 that protrudes inward from the side plate 81 of the frame 8 is provided over the entire periphery of the frame 8 having a rectangular planar outer shape, and the entire peripheral edge of the rear polarizing plate 76 of the liquid crystal display panel 7 is formed by the step surface 82. It is supported.

  In the liquid crystal display module of the present embodiment configured as described above, a height corresponding to the thickness of the rear polarizing plate 76 between the L-shaped single plate portion 721 and the step surface 82 supporting the liquid crystal display panel 7. Space is secured.

  Therefore, also in the case of the liquid crystal display module of the present embodiment, cracking due to the external force of the single plate portion 721 that is likely to occur due to the thinning of the glass substrate 72 is effectively prevented as in the above embodiment.

  Further, the present invention is not limited to the COG type liquid crystal display module using a rectangular glass substrate, but also widely applied to a COF type liquid crystal display module using a substrate having a shape other than a rectangle whose material is fragile and thinning is promoted. Applicable.

(a) is the top view which showed the display part in the application apparatus of the liquid crystal display module as one Embodiment of this invention, (b) is the BB sectional drawing. It is a perspective view which shows the frame single-piece | unit in the said liquid crystal display module. (a) is the top view which showed the display part in the application apparatus of the liquid crystal display module as other embodiment of this invention, (b) is the BB sectional drawing, (c) is CC sectional view FIG. It is the top view which showed the liquid crystal display module as other embodiment of this invention.

Explanation of symbols

1, 7 Liquid crystal display panel 11, 71 Front glass substrate 12, 72 Rear glass substrate 121, 721 Single plate portion 15, 75 Front polarizing plate 16, 76 Rear polarizing plate 2 Backlight (side light type surface emitting irradiation panel)
21 Light guide plate 22 LED
3, 5, 8 Frame 31, 51, 81 Side plate 32, 52, 82 Step surface 4, 6 Base plate 41 Recess 61 Open

Claims (8)

A single plate in which liquid crystal is sandwiched between a front substrate positioned on the display viewing side and a rear substrate positioned on the back side, and at least a part of the end surface of the rear substrate protrudes beyond a corresponding end surface of the front substrate. A liquid crystal display panel provided with a section;
A frame that houses and supports the liquid crystal display panel;
2. A liquid crystal display module according to claim 1, wherein a space is secured between the frame and at least a single plate portion protruding from the front substrate of the rear substrate.   A polarizing plate is installed on the outer surface of the rear substrate opposite to the side sandwiching the liquid crystal, and an edge of the polarizing plate is supported by the frame, and the single plate portion and the support surface of the frame 2. A liquid crystal display module according to claim 1, wherein a space having a height corresponding to the thickness of the polarizing plate is secured between the liquid crystal display module and the liquid crystal display module.   The liquid crystal display panel has a rectangular shape, and the frame body is provided with protrusions that directly contact the front end surface at positions corresponding to at least four corners of the front substrate on the outer surface of the rear substrate. The liquid crystal display module according to claim 1.   The liquid crystal display module according to any one of claims 1 to 3, wherein both the front substrate and the rear substrate are glass substrates. A single plate in which liquid crystal is sandwiched between a front substrate positioned on the display viewing side and a rear substrate positioned on the back side, and at least a part of the end surface of the rear substrate protrudes beyond a corresponding end surface of the front substrate. A liquid crystal display module in which a liquid crystal display panel provided with a portion is housed in a frame body whose outer shape forms a substantially rectangular parallelepiped;
A base with a recess into which the liquid crystal display module is fitted;
At least a corner of the outer surface of the frame corresponding to a single plate protruding from the front substrate of the rear substrate in the liquid crystal display panel is cut out, and a space is secured between the inner surface of the recess. Electronic equipment characterized by   6. The electronic apparatus according to claim 5, wherein a space is secured between the frame body in the liquid crystal display module and at least a single plate portion protruding from the front substrate of the rear substrate. A single plate in which liquid crystal is sandwiched between a front substrate positioned on the display viewing side and a rear substrate positioned on the back side, and at least a part of the end surface of the rear substrate protrudes beyond a corresponding end surface of the front substrate. A liquid crystal display module in which a liquid crystal display panel provided with a portion is housed in a frame;
An electronic apparatus comprising: a base on which the liquid crystal display module is installed and an opening is formed at a position corresponding to a single plate portion protruding from the front substrate of the rear substrate.   The electronic device according to claim 7, wherein a space is secured between the frame body and at least the single plate portion in the liquid crystal display module.

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