JP4910672B2 - Display module, display device, and electronic device - Google Patents

Description

  The present invention relates to a display module in which a display panel is supported by a panel frame, a display device including the display module, and an electronic device including the display device.

  Generally, in a liquid crystal display device or the like, one display module is configured by fixing a display panel to a panel frame. As a structure for fixing the display panel to the panel frame, a structure using a double-sided adhesive tape is known (see, for example, Patent Document 1).

  In recent years, display devices used in electronic devices such as digital cameras and mobile phones have become thinner, and accordingly, the thickness of display panels has become very thin. For this reason, the panel frame that supports the display panel is also referred to as a frame structure that supports the display panel from one side (hereinafter referred to as “one-side frame structure”) from a pair of frame structures that sandwich and support the display panel from both sides (up and down). ), The display device can be made thinner.

  In a liquid crystal display device adopting a one-side frame structure, a notch is formed at a plurality of locations on the outer edge of the panel frame that supports the liquid crystal display panel, and a backlight unit is formed using these notches. There is something that can be attached.

  The backlight unit includes a backlight frame (hereinafter also referred to as “backlight frame”) that supports a backlight light source, a light guide plate, a lens sheet, and the like. A plurality of locking portions corresponding to the notches are formed on the outer edge portion of the backlight frame. By locking these locking portions to the corresponding notches, the display module can be A backlight unit can be attached.

  Here, of the panel frame and the backlight frame, the panel frame is formed in a rectangular ring shape corresponding to the panel size of the display panel in order to take in the light supplied from the backlight light source through the light guide plate to the display panel. . For this reason, conventionally, the panel frame and the display panel are fixed (adhered) using a square annular double-sided adhesive tape along the outer periphery of the panel frame. In addition to the notches described above, a bent portion for increasing the frame strength is formed on the outer edge of the panel frame.

JP 2006-195316 A

  By the way, in the conventional display apparatus, as a structure of a display module, the thickness of a display panel or a panel frame is very thin, and it has a structure which is easy to bend. For this reason, when a static load in the thickness direction (hereinafter simply referred to as “load”) is applied to the display panel, the display panel is cut off due to the difference in relative strength between the notch and the bent portion formed on the outer edge of the panel frame. The notch is locally bent.

  In such a case, if the display panel and the panel frame are firmly bonded, the display panel and the panel frame are bent together at the notch forming portion. For this reason, local stress concentration occurs in the display panel due to the bending of the notch, which may cause damage to the display panel.

  A display module according to the present invention includes a panel frame having a bent portion for increasing the frame strength and a notch for attaching a backlight unit, and a display panel attached to the panel frame by an adhesive means. As the adhesive force of the adhesive means, the adhesive force of the portion corresponding to the notch portion is smaller than the adhesive force of the portion corresponding to the bent portion.

  The display device according to the present invention is a panel frame having a backlight unit, a bent portion for increasing the frame strength, and a notch for attaching the backlight unit, and is attached to the panel frame by an adhesive means. The adhesive means has an adhesive force of a portion corresponding to the notch, which is smaller than an adhesive force of a portion corresponding to the bent portion.

  An electronic apparatus according to the present invention is a panel unit having a backlight unit, a bent portion for increasing the frame strength, and a notch for attaching the backlight unit, and is attached to the panel frame by an adhesive means. A display device, wherein the adhesive means has a display device in which the adhesive strength of the portion corresponding to the notch is smaller than the adhesive strength of the portion corresponding to the bent portion. To do.

  In the display module, the display device, and the electronic apparatus according to the present invention, the adhesive force of the portion corresponding to the notch portion of the panel frame is made smaller than the adhesive force of the portion corresponding to the bent portion, thereby being applied to the display panel. When the panel frame is bent by a load, the display panel can be detached from the panel frame at a portion corresponding to the notch.

  According to the display module, the display device, and the electronic device according to the present invention, when a load is applied to the display panel, the display panel is detached from the panel frame at a portion corresponding to the notch portion of the panel frame. Local stress concentration can be avoided. For this reason, it is possible to prevent the display panel from being damaged due to the stress concentration.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  1A and 1B show a configuration example of a liquid crystal display device according to an embodiment of the present invention, in which FIG. 1A is a side view thereof and FIG. 1B is a cross-sectional view thereof. The illustrated liquid crystal display device 1 is largely configured to include a display module 2 and a backlight unit 3.

  The display module 2 is configured using a liquid crystal display panel 4 and a panel frame 5. The liquid crystal display panel 4 includes a pair (two) of panel substrates 6 and 7 facing each other with a liquid crystal material layer (not shown) interposed therebetween, a polarizing plate 8 provided on the outer surface of one panel substrate 6, and the other A polarizing plate 9 provided on the outer surface of the panel substrate 7 is used. The pair of panel substrates 6 and 7 are configured based on, for example, a transparent glass substrate. Although not shown, a thin film transistor is formed on one panel substrate 6 together with a transparent electrode and an alignment film, and a color filter is formed on the other panel substrate 7 together with a transparent electrode and an alignment film.

  The panel frame 5 supports the liquid crystal display panel 4 and is made of, for example, a metal such as stainless steel. The panel frame 5 is formed in a square ring shape having a square opening corresponding to the panel size of the liquid crystal display panel 4. The panel frame 5 has a panel attachment surface 5A that is parallel to the panel surface of the liquid crystal display panel 4.

  2A and 2B show a state before the liquid crystal display panel 4 is attached to the panel frame 5. FIG. 2A is a plan view thereof, and FIG. 3 shows a state after the liquid crystal display panel 4 is attached to the panel frame 5. FIG. 3A is a plan view thereof, and FIG. 3B is a cross-sectional view taken along line N-N ′ in FIG.

  A liquid crystal display panel 4 (panel substrate 6) is attached to the panel mounting surface 5A of the panel frame 5 via a double-sided adhesive tape 10. The double-sided adhesive tape 10 is one in which, for example, adhesive layers are formed on both surfaces of a resin tape base material having a thickness of several tens of μm. The double-sided adhesive tape 10 serves as an adhesive means for attaching the liquid crystal display panel 4 to the panel frame 5. However, the adhesive means is not limited to the double-sided adhesive tape 10 and may be, for example, an adhesive applied to the panel mounting surface 5A.

  A bent portion 11 for increasing the strength (frame strength) of the panel frame 5 and a notch portion 12 for attaching the backlight unit 3 are formed at the outer edge of the panel frame 5. The bent portion 11 is formed in a state where the outer edge portion of the panel frame 5 is bent at a substantially right angle so that the cross section is L-shaped. For this reason, the angle formed by the panel mounting surface 5A and the bent portion 11 is substantially a right angle.

  The bent portions 11 are provided on the four sides of the outer periphery of the panel frame 5, respectively. On the other hand, the notch 12 is provided in the long side part mutually parallel among four sides of the outer periphery of the panel frame 5. FIG. Moreover, in each long side part of the panel frame 5, the bending part 11 is formed so that the notch part 12 may be pinched | interposed in the direction along the said long side part. For this reason, in each long side part of the panel frame 5, the notch part 12 is formed in the shape where the bending part 11 interrupts on the way. Each notch 12 is formed with a projection 13 for locking a later-described backlight frame. Further, a board mounting portion 14 for mounting the flexible printed wiring board 13 is provided on the outer peripheral portion of the panel frame 5.

  The backlight unit 3 includes a backlight light source (not shown), a light guide plate 15, a lens sheet 16, a backlight connector 17, and a backlight frame 18. The light guide plate 15 guides light generated by the backlight light source in the light guide. The lens sheet 16 is for efficiently extracting the light guided by the light guide plate 15 to the outside (the liquid crystal display panel 4 side).

  The backlight connector 17 is for electrically connecting a backlight light source and a backlight drive circuit (not shown). Further, the backlight unit 3 is provided with a brightness enhancement film or the like as required in addition to a reflection sheet and a diffusion film (not shown). The reflection sheet reflects light guided by the light guide plate 15 on the opposite side of the lens sheet 16. The diffusion film diffuses the light guided by the light guide plate 15. The diffusion film is provided on one surface of the light guide plate 15 so as to overlap the lens sheet 16.

  The backlight frame 18 integrally supports the backlight light source, the light guide plate 15, the lens sheet 16, and the like. The backlight frame 18 is made of a metal such as stainless steel. The outer peripheral edge of the backlight frame 18 is appropriately bent, and a locking portion 19 corresponding to the cutout portion 12 of the panel frame 5 is provided at a part of the bent portion. A through hole is formed in each of the locking portions 19, and the backlight frame 18 and the panel frame 5 are connected to each other by locking the through holes to the protrusions 13 formed in the cutout portion 12. It is the composition which is combined.

  A double-sided adhesive tape (hatched portion) 10 is annularly provided on the panel mounting surface 5 </ b> A of the panel frame 5 so as to surround the opening of the panel frame 5. The double-sided adhesive tape 10 is partially narrowed in the vicinity of the notch 12 corresponding to the notch 12 provided on the outer edge of the panel frame 5.

  More specifically, the width of the double-sided adhesive tape 10 in each long side portion of the panel frame 5 is compared with the tape width W1 of the portion corresponding to the bent portion 11 as shown in FIGS. 4 (A) and 4 (B). Thus, the tape width W2 of the portion corresponding to the notch portion 12 is narrowed. For example, with respect to the tape width W1 in the vicinity of the bent portion 11, the tape width W2 in the vicinity of the notch 12 is set to “W2 = W1 / 2”.

  Here, when the liquid crystal display panel 4 is affixed to the panel frame 5 with the double-sided adhesive tape 10, the adhesive force acting between the liquid crystal display panel 4 and the panel frame 5 is dependent (proportional) on the adhesion area. . Further, the adhesive area increases as the width of the double-sided adhesive tape 10 increases. For this reason, when comparing the adhesive force of the double-sided adhesive tape 10 relative to the two parts such as the bent part 11 and the notch part 12 of the panel frame 5, from the tape width relationship (W1> W2) described above, The adhesive force of the part corresponding to the notch 12 is smaller (weak) than the adhesive force of the part corresponding to the bent part 11.

  Thus, by making a difference in the adhesive force of the double-sided adhesive tape 10 between the bent portion 11 and the notch portion 12, the bonding strength between the liquid crystal display panel 4 and the panel frame 5 is relatively weak at the portion where the notch portion 12 is formed. Become. For this reason, when the adhesive force of the part corresponding to the notch part 12 is weakened appropriately, when a load is applied to the liquid crystal display panel 4 and the panel frame 5 is bent at the notch part 12, FIG. As shown in FIG. 3, the liquid crystal display panel 4 comes off from the panel frame 5 at a portion corresponding to the notch 12 having a weak adhesive force (bonding strength).

  On the other hand, if the adhesive force of the double-sided adhesive tape 10 is made equal between the bent portion 11 and the notch portion 12 and a load is applied to the liquid crystal display panel 4, the liquid crystal display panel 4 and the panel frame 5 are brought together. When the connection between the two is strong enough to bend, as shown in FIG. 5B, when the panel frame 5 is bent at the notch 12, stress concentration occurs in the liquid crystal display panel 4 at the bent portion. The liquid crystal display panel 4 may be damaged.

  Therefore, as in the embodiment of the present invention, even if a load is applied to the liquid crystal display panel 4 and the panel frame 5 is locally bent at the notch portion 12, the liquid crystal display panel 4 is not curved as a result. By weakening the adhesive force of the part corresponding to the notch part 12, local stress concentration does not occur in the liquid crystal display panel 4 due to the separation from the panel frame 5 described above. For this reason, damage to the liquid crystal display panel 4 can be prevented.

  Further, since the double-sided adhesive tape 10 has a partially narrowed width, the adhesive force of the entire double-sided adhesive tape 10 can be sufficiently secured when the liquid crystal display panel 4 is attached to the panel frame 5. For this reason, it becomes possible to prevent damage to the liquid crystal display panel 4 due to stress concentration while maintaining a high coupling strength between the liquid crystal display panel 4 and the panel frame 5.

  In the above embodiment, the width of the double-sided adhesive tape 10 is partially narrowed to make a difference in the adhesive force between the bent portion 11 and the notch portion 12 of the panel frame 5. For example, as shown in FIG. 6, the double-sided adhesive tape 10 has the same width at the bent portion 11 and the cutout portion 12, and a hole 10 </ b> A is formed in the tape portion corresponding to the cutout portion 12. By providing it, you may make it make a difference in adhesive force by the bending part 11 and the notch part 12. FIG.

  As another example, when the display panel is thick enough not to bend, a double-sided adhesive tape 10 is provided on the portion corresponding to the bent portion 11 and the cutout portion 12 is provided, as shown in FIG. By adopting a configuration in which the double-sided adhesive tape 10 is not provided in the portion, the bending force 11 and the cutout portion 12 may make a difference in adhesive strength.

  Further, as another example, although not shown, a coating agent that can reduce the adhesive strength of the double-sided adhesive tape 10 on the part corresponding to the notch 12 on the panel mounting surface 5A of the panel frame 5, such as petrolatum (product Name: Vaseline) or the like may be applied to make a difference in adhesive strength between the bent portion 11 and the cutout portion 12.

  The present invention also provides an electronic device having a liquid crystal display device having the above-described configuration, for example, a mobile phone, a digital camera, a video phone, an AV (audio and visual) device, a TV, a car navigation device, a video phone, an electronic notebook, a mobile phone. It can also be realized as an electronic device such as an information terminal.

It is a figure which shows the structural example of the liquid crystal display device which concerns on embodiment of this invention. It is a figure which shows the state before sticking a liquid crystal display panel to a panel frame. It is a figure which shows the state after bonding a liquid crystal display panel to a panel frame. It is the figure which expanded a part of panel frame. It is a comparison figure of the panel deformation state by the difference in adhesive force. It is a figure which shows the 1st modification of this invention. It is a figure which shows the 2nd modification of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Display module, 3 ... Backlight unit, 4 ... Liquid crystal display panel, 5 ... Panel frame, 10 ... Double-sided adhesive tape, 11 ... Bending part, 12 ... Notch part, 18 ... Backlight frame

Claims (3)

A panel frame having a bent portion for increasing the frame strength and a notch for attaching the backlight unit;
A display panel attached to the panel frame by an adhesive means,
The display module, wherein an adhesive force of a portion corresponding to the notch is smaller than an adhesive force of a portion corresponding to the bent portion as an adhesive force of the adhesive means. A backlight unit;
A panel frame having a bent portion for increasing the frame strength and a notch for attaching the backlight unit;
A display panel attached to the panel frame by an adhesive means,
The display device according to claim 1, wherein the adhesive force of the part corresponding to the notch is smaller than the adhesive force of the part corresponding to the bent part. A backlight unit;
A panel frame having a bent portion for increasing the frame strength and a notch for attaching the backlight unit;
A display panel attached to the panel frame by an adhesive means,
An electronic apparatus comprising: a display device in which an adhesive force of a portion corresponding to the notch portion is smaller than an adhesive force of a portion corresponding to the bent portion as an adhesive force of the adhesive means.

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