JP2010032653A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: the amount of light which is lost before being output from a panel surface is large in a conventional attachment structure; and a protection panel having a rigidity lower than that of an enclosure is easily deformed to cause distortion of a display image when being attached. <P>SOLUTION: A liquid crystal display module and a protection panel are filled with an optical elastic material and are integrated into a liquid crystal display panel module. The liquid crystal display panel module has the protection panel attached to an enclosure aperture. In this case, a material capable of absorbing stress occurring on an attachment surface of the protection panel, by deformation of the material itself is used as a fixing member which fixes the whole of an outer circumference of the protection panel to the enclosure in a circumferential edge part of the enclosure aperture or a supporting member attached to the enclosure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The invention described in this specification relates to a fixing structure between a casing and a protection panel when the surface of a liquid crystal display panel is protected by a protection panel.

  In recent years, liquid crystal display panels have been adopted as display devices in various electronic devices. For example, it is employed in display devices such as mobile phones, portable information terminals, digital still cameras, audio players, and portable game machines. Some portable electronic devices have a touch panel function added to the surface of a liquid crystal display panel.

  FIG. 1 shows an example of a mounting structure of a liquid crystal display panel 1 and a casing 3 that are conventionally employed. The liquid crystal display panel 1 is a device module in which a liquid crystal panel is assembled on the surface of a backlight (not shown). In the case of FIG. 1, the back surface of the liquid crystal display panel 1 is fixed to the inner surface of the housing (lower surface side) 3 with the double-sided tape 5 interposed therebetween. Since the purpose is fixing, the double-sided tape 5 is thin and has a strong adhesive force.

  On the other hand, the surface of the liquid crystal display panel 1 is fixed to the protective panel 9 with the cushion tape 7 interposed therebetween. The cushion tape 7 here is disposed for the purpose of protecting the surface of the liquid crystal display panel 1 from dust and mounting errors.

  In the mounting structure shown in FIG. 1, an air layer (gap) 11 is formed between the liquid crystal display panel 1 and the protective panel 9 so that the rear surface of the deformed protective panel 9 does not contact the surface of the liquid crystal display panel 1. ing. The air layer 11 is disposed to protect the liquid crystal layer of the liquid crystal display panel 1 from deformation of the protective panel 9 by stress or external force.

The outer peripheral edge of the protective panel 9 is welded to the housing (surface side) 3. That is, the protective panel 9 and the housing 3 are integrated.
Japanese Patent Laid-Open No. 2007-052183 JP 2007-102565 A

  Incidentally, the refractive index of the air layer 11 is significantly different from the refractive indexes of the liquid crystal display panel 1 and the protection panel 9. For this reason, at the boundary surface of the air layer 11, it is unavoidable that reflection occurs in the transmitted light, and there is a problem that visibility is deteriorated due to scattering due to reflection. The influence of this reflection causes the amount of reflected light to increase in proportion to the intensity of outside light when the electronic device is used outdoors, which causes a decrease in visibility.

FIG. 2 shows the cause of the decrease in visibility.
As shown in FIG. 2, external light is reflected on the front and back surfaces of the protective panel 9 and the surface of the liquid crystal display module 1, and reflects about 4% of the amount of light on each reflecting surface. That is, about 12% of the external incident light is output to the outside as reflected light. For this reason, in the outdoors where there is a large amount of light, the reflected light becomes strong and the visibility deteriorates.
For these reasons, it is necessary to mount an antireflection film and a backlight with a large amount of light generation on a liquid crystal display panel that is assumed to be used outdoors.

In the case of the panel structure shown in FIG. 1, the protective panel 9 is required to have high rigidity. This is because the protective panel 9 having low rigidity is deformed relatively easily.
Here, the deformation principle of the protection panel 9 will be described with reference to FIG. FIG. 3 shows a state in which stress is generated in the in-plane direction due to the expansion force of the protective panel 9.

  The stress here acts to compress the protective panel 9. As a result, when the rigidity of the protection panel 9 is low, the protection panel 9 is deformed so as to bend inward of the housing as indicated by arrows in FIG. FIG. 4 shows the relationship between the amount of deflection of the protective panel 9 and the in-plane distribution. 4A shows the distribution of the amount of deflection when the protective panel 9 is viewed from above, and FIG. 4B shows an end view when the protective panel 9 is broken at the II section. ing.

In FIG. 4A, a region with a large amount of deflection is expressed darkly, and a region with a small amount of deflection is thinly represented. Therefore, the outer peripheral edge portion of the protective panel 9 integrated with the housing 3 is shown in white. From FIG. 4, it can be seen that the amount of deflection increases toward the center of the protective panel 9.
If the amount of bending is large, the protective panel 9 comes into contact with the liquid crystal display panel 1 near the center of the screen, and the liquid crystal layer is deformed. This deformation of the liquid crystal layer is visually recognized as a disturbance of the display screen, and there is a problem that the display quality is deteriorated.

Therefore, in the conventional case, highly rigid glass is used as the protective panel 9.
However, further reduction in manufacturing cost requires the use of a protective panel having low rigidity.

Therefore, the inventors propose a mounting structure that can suppress a decrease in the amount of transmitted light in the liquid crystal display panel module and that can use a protective panel having low rigidity for mounting the liquid crystal display panel module to the housing.
Specifically, an electronic device is configured by the devices and mounting structures shown in the following (a) to (d).

(A) Liquid crystal display panel module The liquid crystal display panel module has a structure in which (i) a liquid crystal display module, (ii) a protection panel, and an optical elastic body are integrated. The protective panel is a highly transparent protective panel that covers the entire display surface of the liquid crystal display panel, and is formed of a material that is less rigid than the housing. Further, the optical elastic body that fills the space between the display surface of the liquid crystal display panel and the back surface of the protective panel without a gap is composed of a member whose optical characteristics are equivalent to the optical characteristics of the liquid crystal display module and the protective panel described above. And By adopting this structure, it becomes possible to efficiently transmit the light beam emitted from the liquid crystal display module to the surface of the protective panel.

(B) System Control Unit The system control unit is a device that controls the entire system in the electronic device.
(C) Housing The housing is a case for housing the system control unit and the liquid crystal display panel module. Moreover, the housing according to the invention has an opening that exposes the protective panel constituting the liquid crystal display panel module to the surface of the housing.

(D) Fixing member A fixing member is a device which fixes the whole outer periphery of a protection panel to the housing located in the peripheral part of opening, or the support member attached to the housing. In addition, the fixing member has a function of absorbing stress generated on the mounting surface of the protective panel by its own deformation. With these functions, the fixing member reduces the propagation of stress to the protective panel. As a result, the deformation of the protective panel is suppressed, and an electronic device in which the display quality is hardly deteriorated can be realized.

  In the case of the invention proposed by the inventors, it is desirable that the above-described protective panel is formed of a resin material, and at least the peripheral portion of the opening of the housing is formed of a metal material. That is, it is desirable that the linear expansion coefficient of the protective panel is larger than the linear expansion coefficient of the housing. In this case, the effect of absorbing the deformation of the protective panel due to the deformation of the fixing member is most exhibited. However, the entire casing may be made of a metal material as in the exemplary embodiments described later.

  Furthermore, in the invention proposed by the inventors, it is desirable that a gap larger than the mounting tolerance is formed in the surface direction of the housing between the protective panel and the peripheral edge portion of the opening. Due to this gap, the effect of stress absorption of the protective panel due to deformation of the fixing member can be increased.

In the invention proposed by the inventors, the liquid crystal display module is attached to the housing or the housing in a state where the back surface of the liquid crystal display module is not fixed to the inner wall surface of the housing or the supporting member attached to the housing. It is desirable to be held on.
Further, in the invention proposed by the inventors, on the back side of the liquid crystal display module, there is an absorber that absorbs the shift of the liquid crystal display panel module to the back of the casing by its own deformation contacting the back surface of the liquid crystal display module. It is desirable to be arranged.

  In the case of the invention proposed by the inventors, the liquid crystal display panel module has a configuration in which a liquid crystal display panel, a protection panel, and an optical elastic body are integrated. For this reason, the liquid crystal display panel module has a sufficient thickness and has high rigidity that is difficult to deform itself.

Moreover, in the case of the invention proposed by the inventors, a fixing member that can absorb the stress generated between the protection panel and the casing by its own deformation is used for fixing the protection panel and the supporting member attached to the casing or the casing. use. For this reason, the stress which acts on a protection panel can be made remarkably small compared with the conventional structure.
For this reason, it becomes possible to use a protection panel with lower rigidity than the housing for attachment to the housing. In addition, since the stress on the protective panel can be made extremely small, the deformation itself can be eliminated or the amount of deformation can be minimized, so that an electronic device in which display quality hardly changes depending on the usage mode can be realized.

  In the case of the invention proposed by the inventors, the gap between the liquid crystal display panel constituting the liquid crystal display panel module and the protective panel is filled with an optical elastic body having optical characteristics completely equivalent to these. For this reason, the light quantity of the light emitted from the backlight proceeds without being lost until it is emitted from the protective panel to the outside. For this reason, even if the light quantity of the backlight is the same, the surface brightness can be increased as compared with the conventional structure. As a result, the visibility of the display image in the outdoors can be improved.

Hereinafter, an electronic device in which the liquid crystal panel module is mounted will be described.
In addition, the well-known or well-known technique of the said technical field is applied to the part which is not illustrated or described in particular in this specification. Moreover, the form example demonstrated below is one form example of invention, Comprising: It is not limited to these.

(A) Structural example 1
(A-1) Appearance Example FIG. 5 shows an appearance example of a digital camera that is an example of the electronic apparatus 21 according to the embodiment. FIG. 5A is an example of the external appearance of the digital camera viewed from the front side (subject side), and FIG. 5B is an external example of the digital camera viewed from the back side (photographer side).

  In the case of the digital camera shown in FIG. 5, a slide-type lens protection cover 25 and an imaging lens unit 27 are disposed on the housing 23 on the front side. A shutter button 29 is disposed on the housing 23 on the upper surface side. A liquid crystal display screen 31 and operation buttons 33 are arranged on the housing 23 on the back side.

(A-2) Example of decomposition structure FIG. 6 shows an example of the decomposition structure of a digital still camera. In FIG. 6, parts corresponding to those in FIG. 1 are denoted by the same reference numerals. The invention is also characterized by a structure for attaching the liquid crystal display panel module 41 to the housing 23. For this reason, in the case of FIG. 6, only the rear housing on which the liquid crystal display screen 31 is arranged is represented in the housing 23.

In the case of this embodiment, the housing 23 is made of metal or aluminum or magnesium. The linear expansion coefficient of aluminum is 23.6 × 10 ⁻⁶ / ° C. The linear expansion coefficient of magnesium is 27 × 10 ⁻⁶ / ° C. These metal materials are characterized by high rigidity and low linear expansion coefficient. In addition, the metal material should just be used about the peripheral part of the opening 25, and all the housings 23 do not necessarily need to be a metal material.

  6 has an opening 25 for exposing the protective panel 9 to the surface of the casing. In the case of FIG. 6, the central part of the protective panel 9 is formed thick, and the outer peripheral edge is formed thin. Therefore, the opening 25 in FIG. 6 is formed to be slightly larger than the area of the thick part of the protective panel 9 so that the thick part of the protective panel 9 can be fitted from the inside of the housing 23.

In the case of this embodiment, the protective panel 9 is made of a resin material having rigidity lower than that of the housing 23. As the resin material, for example, acrylic resin (for example, PMMA) or polycarbonate (PC) is used.
The linear expansion coefficient of acrylic resin and polycarbonate is 70 × 10 ⁻⁶ / ° C. In addition, although only the linear expansion coefficient with respect to a temperature change is given above, the resin material is larger than the metal material in terms of the linear expansion coefficient with respect to water absorption.

  These resin materials are known as highly transparent materials. In addition, these resin materials have a characteristic that the linear expansion coefficient is larger than that of the housing 23, while the rigidity thereof is smaller than that of the housing 23.

In the case of this embodiment, the protective panel 9 is fixed to the peripheral edge portion of the opening 25 in the housing 23 by the double-sided tape 27. This double-sided tape 27 corresponds to the fixing member in the claims. The double-sided tape 27 in this embodiment has a square shape (annular shape) and is attached along the outer edge portion (the attachment surface of the thin portion) of the protective panel 9.
The double-sided tape 27 in this embodiment employs a member having a sufficient thickness and flexibility as well as a pressure-sensitive adhesive surface formed on both sides of the substrate.

The reason why the double-sided tape 27 is required to have a sufficient thickness and flexibility is to absorb the following two types of stress by its own deformation.
One of the assumed stresses is a stress generated on the mounting surface of the protective panel 9 and the casing 23 due to manufacturing variations.

  Another assumed stress is a stress generated based on the difference in linear expansion coefficient between the protective panel 9 and the housing 23. As described above, the linear expansion coefficients of the protective panel 9 and the housing 23 are different by a factor of two or more. For this reason, the extension amount of the protection panel 9 and the extension amount of the housing 23 with respect to a temperature change are more than doubled. This difference in the amount of elongation generates stress on the mounting surfaces of the protective panel 9 and the housing 23.

The material, hardness, and thickness of the base material constituting the double-sided tape 27 are determined in consideration of the magnitudes of these two stresses. When the difference in linear expansion coefficient is large as in the combination of the protective panel 9 and the casing 23 described above, a flexible and thick structure is selected for the double-sided tape 27.
For reference, when the difference in linear expansion coefficient between the protective panel 9 and the housing 23 is small, there are few constraints and almost any material can be selected.

  Note that, when the difference in linear expansion coefficient is large as in this embodiment, the types of base materials that can be selected as the double-sided tape 27 include porous resins, gel-like resins, rubber-based materials, and the like. Among these, the porous resin includes urethane sponge, polyolefin foam, rubber sponge, and the like. Examples of the gel resin include a silicon sheet and a urethane gel sheet. Examples of rubber materials include silicon rubber and natural rubber.

  In the case of this embodiment, the optical elastic body 29 is filled between the protective panel 9 and the liquid crystal display module 1 without a gap. The optical characteristics of the optical elastic body 29 here are equivalent to the optical characteristics of the protective panel 9 and the liquid crystal panel 1A (specifically, a glass substrate). For example, the refractive index is equivalent.

  If the optical characteristics are the same, the light beam travels without reflection at both boundary surfaces of the optical elastic body 29 (the boundary surface between the protective panel 9 and the liquid crystal panel 1A). As a result, the decrease in the amount of light that occurs before the light beam emitted from the backlight (not shown) is emitted from the surface of the protective panel 9 to the outside is about 8% smaller than that in the conventional configuration (FIG. 1). can do. Similarly, the reflection of external light can be reduced by about 8% compared to the conventional structure (FIG. 1).

In the case of this embodiment, a photocurable resin material is used for the optical elastic body 29. For example, a resin composition containing the following three types of materials is used.
・ One or more polymers such as polyurethane acrylate, polyisoprene acrylate or ester compounds thereof, terpene hydrogenated resins, butadiene polymers, etc. 1 such as isobornyl acrylate, dicyclopentenyloxyethyl methacrylate, 2-hydroxybutyl methacrylate Photopolymerization initiators such as one or more kinds of acrylate monomers, 1-hydroxy-cyclohexyl-phenyl-ketone

In addition, the film thickness of the optical elastic body 29 shall be about 50 micrometers-200 micrometers. Further, a visible light region having a transmittance of 90% or more and a storage elastic modulus at 25 ° C. of 1 × 10 ⁷ Pa or less is used.
Meanwhile, on the lower surface of the optical elastic body 29, the liquid crystal display module 1 including a backlight (not shown) and the liquid crystal panel 1A is disposed.
However, in the case of this embodiment, the protective panel 9 and the liquid crystal display module 1 are structurally integrated with the optical elastic body 29 interposed therebetween to constitute a liquid crystal display panel module 41.

(A-3) Cross-sectional Structure Example Mounting Structure FIG. 7 shows a cross-sectional structure example of the electronic device 21 described above. In FIG. 7, the same reference numerals are given to the portions corresponding to those in FIG. 1.
As shown in FIG. 7, the protective panel 9 has a convex cross-sectional shape. The protective panel 9 is formed with a thick central portion facing the effective display area, and a thin protrusion on the outer peripheral edge thereof. Of the thin projection, the portion facing the housing 3 is the attachment surface 9A.

  As shown in FIG. 7, the position of the attachment surface 9 </ b> A is located outside the opening 25. Therefore, the liquid crystal display panel module 41 (protection panel 9, optical elastic body 29, liquid crystal display module 1) is attached so that the convex portion of the protection panel 9 is fitted into the opening 25 from the back side of the housing 23.

  In the case of the cross-sectional structure example shown in FIG. 7, a structure in which a cushioning material 43 having flexibility is disposed at a position facing the back surface of the liquid crystal panel module 41 is employed. The cushion material 43 corresponds to an “absorber” in the claims.

  This cushion material 43 is mainly for absorbing component tolerance and stress deformation. In the case of this embodiment, the cushion material 43 is assembled between the front surface of the cushion material 43 and the back surface of the liquid crystal display module 1 in the assembled state. A gap is formed. This gap is provided to absorb an impact when an external force that pushes the protective panel 9 into the housing is applied.

It should be noted that gaps 9B and 9C that take into account the deformation of the double-sided tape 27 are provided at the attachment portion of the protective panel 9 and the housing 23. The gaps 9 </ b> B and 9 </ b> C are both formed in the surface direction of the housing 23 with a length equal to or longer than the mounting tolerance.
In FIG. 8, the attachment part of the protection panel 9 and the housing 23 is expanded and shown.

The gap 9 </ b> B refers to a gap having a length D <b> 1 formed between the side wall of the central convex portion of the protective panel 9 and the side wall of the housing 23. The gap 9 </ b> C is a gap having a length D <b> 2 formed between the double-sided tape 27 and the side wall (step) of the housing 23.
These gaps are arranged to spatially absorb the expansion and contraction of the protective panel 9 and the casing 23. Further, these gaps define the maximum amount of deformation of the double-sided tape 27 in the horizontal direction.

(A-4) Effect Realized by Adoption of Structure FIG. 9 shows a case where the protective panel 9 expands in the direction of the arrow (the direction of the housing surface). Note that the expansion occurs due to temperature change and water absorption.
At this time, it is the elasticity of the gaps 9B and 9C and the double-sided tape 27 that exhibits the function of minimizing the deformation of the parts.

  The double-sided tape 27 is composed of a thick base material having high flexibility. For this reason, even if the protection panel 9 is deformed due to thermal expansion, the stress generated in the fixing portion between the protection panel 9 and the housing 23 is used for deformation of the double-sided tape 27.

That is, as shown in FIG. 10, the stress generated in the fixing portion between the protective panel 9 and the housing 23 is absorbed by the deformation of the double-sided tape 27.
In the initial state, a gap 9 </ b> B having a length D <b> 1 greater than the mounting tolerance is formed between the protective panel 9 and the housing 23 along the entire circumference of the opening 25. For this reason, unless the side wall of the center convex part of the protection panel 9 and the side wall of the housing 23 are in contact with each other due to the expansion of the protection panel 9 and the housing 23 due to thermal expansion, stress on the protection panel 9 is generated only on the mounting surface 9A.

  The stress generated on the mounting surface 9A of the protective panel 9 is attenuated by the deformation of the double-sided tape 27. Therefore, as shown in FIG. 11, the deformation of the protective panel 9 can be kept very small. 11A shows the distribution of the amount of deflection when the protective panel 9 is viewed from above, and FIG. 11B is an end view when the protective panel 9 is broken at the II portion. Represents.

  Moreover, in this embodiment, the liquid crystal display panel module 41 has a structure in which the liquid crystal display module 1, the optical elastic body 29, and the protective panel 9 are integrated. For this reason, the rigidity of the protection panel 9 in this embodiment is higher than that of the conventional structure (in the case of only the protection panel 9). Therefore, the stress deformation when the protective panel 9 expands can be very small. This means that the display quality is hardly deteriorated due to stress. As a result, it is possible to use the protective panel 9 made of a resin material for mounting the liquid crystal display panel module 41.

Moreover, if the double-sided tape 27 having a thickness rich in flexibility is used, variations in flatness of the attachment portion of the housing 23 can be absorbed. This eliminates the need for component selection and adjustment during assembly. In addition, deformation of the protective panel 9 due to variations in flatness can be prevented.
Incidentally, when the double-sided tape 27 having a large thickness with high flexibility cannot be used, the protective panel 9 is integrally fixed to the housing 23 as in the conventional structure. Then, since the stress generated with the deformation of the protective panel 9 and the housing 23 is concentrated on the protective panel 9 having a low rigidity and the liquid crystal layer is deformed, the presence of the double-sided tape 27 described in the embodiment is very important.

  In addition, since a gap (space) on the back side of the liquid crystal display module 1 is provided, even when an external force is applied from the surface side of the protective panel 9 to the inside of the housing, the double-sided tape is rich in flexibility and has a large thickness. 27 can be deformed in the depth direction of the housing. Therefore, even when an external force that pushes the protective panel 9 from the front side to the inside of the housing acts, this can be absorbed as a deformation of the double-sided tape 27. For this reason, deformation of the protection panel 9 can be minimized.

  In addition, a cushion material 43 is provided on the back side of the liquid crystal display module 1 with the gap (space) described above interposed therebetween. For this reason, even when the external force acting on the inside of the housing from the surface side of the protective panel 9 is large, most of the external force can be attenuated by the deformation of the cushion material 43. Thereby, not only the damage of the liquid crystal display panel module 41 and the housing 23 but also the damage to the built-in electronic circuit can be minimized.

  In the case of this embodiment, since the flexible double-sided tape 27 and the highly rigid liquid crystal display panel module 41 are used, an electronic device that is resistant to external force and stress can be realized even if there are few components. As a result, the electronic device can be thinned.

In the case of this embodiment, the space between the liquid crystal display module 1 and the protective panel 9 is filled with an optical elastic body 29 having the same refractive index as these. For this reason, as shown in FIG. 12, the external light reaches the surface of the liquid crystal display module 1 without being reflected by the boundary portion of the optical elastic body 29. As a result, the amount of light due to reflection of external light can be suppressed to only about 4% generated on the surface of the protective panel 9.
For this reason, it becomes possible to reduce the amount of light reflected compared with the conventional structure, and the visibility of a display image can be improved also outdoors.

(B) Structural example 2
Then, the 2nd structural example suitable for the electronic device which concerns on a form example is demonstrated. The basic external configuration and the example of the disassembly structure are the same as those of the structure example 1.
FIG. 13 illustrates a cross-sectional structure example of the electronic device 21 corresponding to the structural example 2. In FIG. 13, the same reference numerals are given to the portions corresponding to those in FIG. 7.

The difference between Structural Example 2 and Structural Example 1 is the insertion direction when the liquid crystal display panel module 41 is attached to the housing 23. The structural example 1 was a structure suitable for mounting the liquid crystal display panel module 41 so as to be fitted from the back side of the housing 23 on the display surface side.
On the other hand, in the case of Structural Example 2, it is assumed that the liquid crystal display panel module 41 is mounted so as to be fitted into the opening 25 from the surface side of the housing 23.

  For this mounting method, in the case of the casing 23 according to the structural example 2, the casing 23 located at the outer peripheral edge of the opening 25 is bent into an L-shaped cross section or an inverted L-shaped. In FIG. 13, the bent surface, which is a mounting surface used to support the protective panel 9 from the back surface, is denoted by reference numeral 23 </ b> A.

  In the case of this structural example, even when an external force that acts to push in the depth direction of the housing acts on the surface of the protection panel 9, the protection panel 9 can be supported from the back side by the highly rigid housing 23. For this reason, the intensity | strength with respect to the same external force can be raised rather than the structural example 1. FIG. Moreover, there is no worry that the protective panel 9 is peeled off from the housing 23 by an external force.

  In the case of this structural example, the protective panel 9 is fitted into the housing 23 so as to cover the entire opening 25 from the surface side. Therefore, the protective panel 9 is configured to be slightly larger than the opening 25. And the back surface of the outer edge part of the protection panel 9 is used as an attachment surface as it is. For this reason, the thin projection part like the structural example 1 is unnecessary for the protection panel 9 according to the structural example 2.

(C) Structural example 3
FIG. 14 shows a cross-sectional structure example of the electronic device 21 corresponding to the structure example 3. Also in FIG. 14, parts corresponding to those in FIG. 7 are denoted by the same reference numerals.
Similarly to the case of the structural example 1, the structural example 3 corresponds to the case where the protective panel 9 is attached so as to be fitted from the back side of the housing 23. Of course, the mounting method of the protective panel 9 and the casing 23 and the structure of the liquid crystal display panel module 41 are the same as those in the first structural example.

  One of the differences from Structural Example 1 is that the outer edge portion of the protection panel 9 is supported from the back side of the housing 23 by a first support plate 51 that is detachably attached to the housing 23. In the case of this embodiment, the first support plate 51 is configured as, for example, a square-shaped flat plate member. However, the support by the first support plate 51 is auxiliary. Accordingly, the first support plate 51 may be large enough to support only a part of the outer peripheral edge of the protective panel 9.

  One surface of the first support plate 51 is in contact with the end surface of the screw receiving portion 23C formed on the back surface of the housing 23 on the display surface side and the convex portion 23B having the end surface at the same height as the end surface. It is attached with. As described above, the first support plate 51 is used to reinforce the fixation by the double-sided tape 27, and in particular, to increase the strength against external force in the rear direction of the housing.

  Another one of the differences is that the cushion material 43 is attached not to the housing 23 but to the second support plate 53 that is detachably attached to the housing 23. In the case of this embodiment, the second support plate 53 is configured as a saucer-shaped member having a recessed central portion. The first and second support plates 51 and 53 are screwed to the housing 23 together with the first support plate 51 so as to be sandwiched between the head portions of the screws 55. A screw receiving portion 23 </ b> C in which a groove corresponding to the thread of the screw 55 is formed is disposed on the back side of the housing 23.

(D) Structural example 4
FIG. 15 illustrates a cross-sectional structure example of the electronic device 21 corresponding to the structural example 4. FIG. 15 shows parts corresponding to those in FIGS. 13 and 14 with the same reference numerals.
This structural example 5 corresponds to the case where the protective panel 9 is attached so as to be fitted from the front side of the housing 23 as in the case of the structural example 2.

Therefore, also in the case of the protection panel 9 according to the structural example 4, a plate-shaped one having no mounting projections on the outer peripheral edge of the protection panel 9 is used.
In addition, as in the case of the structural example 3, the structural example 5 employs a structure using the first and second support plates 51 and 53.

  One of the differences between the structural example 4 and the structural example 2 described above is that the mounting surface 23A having an L-shaped cross section or an inverted L-shaped cross section is not provided on the housing 23. For this reason, in the case of this structural example 4, the holding panel 9 is fixed to the first support plate 51 with the double-sided tape 27 interposed therebetween. Similarly, the housing 23 is also fixed to the first support plate 51 with the double-sided tape 27 interposed therebetween.

  That is, in the case of this structural example 4, the housing 23 and the protective panel 9 are indirectly fixed via the first support plate 51. However, stress and external force are absorbed by the double-sided tape 27 as described above.

  In the case of this structural example 4, a structure is adopted in which the surface of the cushion material 43 is brought into contact with the back surface of the liquid crystal display module 1 (specifically, the backlight). This is because the external force acting to push the protective panel 9 into the interior of the housing is absorbed by the deformation of the double-sided tape 27 and the cushion material 43. The surface of the cushion material 43 and the backlight are not fixed. This is because when the surface of the cushion material 43 and the backlight are fixed, new stress is applied to the liquid crystal display panel module 41.

(E) Other Embodiments (E-1) Other Structures In the structure examples described above, the case where the material of the housing 23 is basically a metal material and the material of the protective panel 9 is a resin has been described.
However, the housing 23 may also be formed of a resin material. That is, both the housing 23 and the protection panel 9 may be formed of a resin material. Examples of the resin material suitable for the housing 23 include polystyrene (PS) and ABS resin. Here, the linear expansion coefficient of polystyrene is 70 × 10 ⁻⁶ / ° C. The linear expansion coefficient of the ABS resin is 90 × 10 ⁻⁶ / ° C.

  Thus, when both the housing 23 and the protection panel 9 are made of a resin material, the difference in elongation due to temperature change and water absorption becomes small. Therefore, as described above, there is no restriction on the material of the double-sided tape 27. Of course, as in the case of the structure example described above, the double-sided tape 27 that is thick and flexible can also be used.

(E-2) Fixing member In the above-described structural example, the case where the double-sided tape 27 is used for fixing the protective panel 9 and the casing 23 or the protective panel 9 and the support plate 51 attached to the casing 23 has been described.
However, the double-sided tape 27 is an example, and any member may be used as long as it can absorb the stress generated between the mounting surface and the attachment surface by its own deformation.

(E-3) Product Example (a) Electronic Device In the above description, a digital camera is exemplified as an example of an electronic device in which the invention is mounted on the liquid crystal display panel module 41. Here, other electronic devices that can be mounted are exemplified.

  FIG. 16 shows a conceptual configuration example common to the electronic device 71. The electronic device 71 includes a liquid crystal display panel module 73, a system control unit 75, and an operation input unit 77 that are mounted on the housing 23 by the mounting structure described above. The processing content executed by the system control unit 75 varies depending on the product form of the electronic device 71. The operation input unit 77 is a device that receives an operation input to the system control unit 75. For the operation input unit 77, for example, a switch, a button, other mechanical interfaces, a graphic interface, or the like is used.

(B) Product Example Next, a product example of an electronic device will be exemplified.
FIG. 17 shows an example of an external appearance when the electronic apparatus is a television receiver. On the front surface of the housing 83 of the television receiver 81, a display screen 85 made of a front panel, filter glass, or the like is disposed. The display screen 85 here corresponds to the display surface of the liquid crystal display panel module 73.

  In addition, for example, a video camera is assumed as this type of electronic apparatus. FIG. 18 shows an example of the appearance of the video camera 91.

  The video camera 91 includes an imaging lens 95 that images a subject in front of the housing main body 93, a shooting start / stop switch 97, and a display screen 99 that is used to check a captured image. Among these, the display screen 99 corresponds to the display surface of the liquid crystal display panel module 73.

  Moreover, for example, a portable terminal device is assumed as this type of electronic apparatus. FIG. 19 shows an example of the appearance of a mobile phone 101 as a mobile terminal device. A cellular phone 101 illustrated in FIG. 19 is a foldable type. FIG. 19A illustrates an appearance example in a state where the housing is opened, and FIG. 19B illustrates an appearance example in a state where the housing is folded.

  The cellular phone 101 includes an upper housing 103, a lower housing 105, a connecting portion (in this example, a hinge portion) 107, a display screen 109, an auxiliary display screen 111, a picture light 113, and an imaging lens 115. Among these, the display screen 109 and the auxiliary display screen 111 correspond to the display surface of the liquid crystal display panel module 73.

Also, for example, a computer is assumed as this type of electronic apparatus. FIG. 20 shows an example of the appearance of the notebook computer 121.
The notebook computer 121 includes a lower housing 123, an upper housing 125, a keyboard 127, and a display screen 129. Among these, the display screen 129 corresponds to the display surface of the liquid crystal display panel module 73.
In addition to these, an audio playback device, a game machine, an electronic book, an electronic dictionary, and the like are assumed as the electronic apparatus according to the embodiment.

(E-4) Others Various modifications can be considered for the above-described embodiments within the scope of the gist of the invention. Various modifications and applications created or combined based on the description of the present specification are also conceivable.

It is a figure which shows an example of the conventional structure used for attachment of a liquid crystal display panel and a housing. It is a figure explaining the reflection which generate | occur | produces in the interface of an air layer and each member. It is a figure explaining the relationship between generation | occurrence | production of stress, and a deformation | transformation. It is a figure explaining the in-plane distribution of bending amount. It is a figure which shows the external appearance structural example of an electronic device. It is a figure which shows the decomposition | disassembly structure example of an electronic device. It is a figure which shows the example of a cross-section according to an example. It is a fragmentary sectional view which expands and shows the attachment part of a protection panel and a housing. It is a figure explaining the expansion | swelling direction assumed during use. It is a figure explaining the absorption of the stress by a deformation | transformation of a double-sided tape. It is a figure explaining the in-plane distribution of bending amount. It is a figure explaining advancing and reflection of light at the time of using the liquid crystal display panel module which concerns on an example. It is a figure which shows the other structural example. It is a figure which shows the other structural example. It is a figure which shows the other structural example. It is a figure which shows the example of a conceptual structure of an electronic device. It is a figure which shows the example of goods of an electronic device. It is a figure which shows the example of goods of an electronic device. It is a figure which shows the example of goods of an electronic device. It is a figure which shows the example of goods of an electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display module 1A Liquid crystal panel 3 Housing 7 Cushion tape 9 Protection panel 9A Mounting surface 9B Clearance 9C Clearance 11 Air layer 23 Housing 23A Mounting surface 25 Opening 27 Double-sided tape 29 Optical elastic body 41 Liquid crystal display panel module 43 Cushion material 51 1st Support member 53 Second support member

Claims (8)

A liquid crystal display module, a highly transparent protective panel that covers the entire display surface of the liquid crystal display panel, the protective panel formed of a material that is less rigid than the housing, the display surface of the liquid crystal display panel, and the protection A liquid crystal display panel module that is an optical elastic body that fills a gap between the back surface of the panel without any gap, the optical characteristics of which are integrated with the liquid crystal display module and an optical elastic body equivalent to the optical characteristics of the protective panel;
A system control unit for controlling the entire system;
A housing having an opening exposed on the surface of the housing, the protective panel constituting the liquid crystal display panel module;
A fixing member that fixes the entire outer periphery of the protective panel to a casing located on the peripheral edge of the opening or a support member attached to the casing, and absorbs stress generated on the mounting surface of the protective panel by its own deformation. An electronic device having a fixing member. The protective panel is formed of a resin material,
The electronic device according to claim 1, wherein at least a peripheral portion of the opening of the housing is formed of a metal material. The electronic device according to claim 2, wherein a gap greater than a mounting tolerance is formed in a surface direction of the housing between the protective panel and a peripheral edge portion of the opening. In a state where the back surface of the liquid crystal display module is not fixed to the inner wall surface of the housing or the support member attached to the housing,
The electronic device according to claim 3, wherein the liquid crystal display module is held by the casing or a support member attached to the casing. On the back side of the liquid crystal display module,
The electronic device according to claim 3, wherein an absorber that absorbs a shift in a depth direction of the housing of the liquid crystal display panel module by its deformation contacting the back surface of the liquid crystal display module is disposed. The electronic device according to claim 3, wherein the fixing member is a porous resin. The electronic device according to claim 3, wherein the fixing member is a gel-like resin. The electronic device according to claim 3, wherein the fixing member is a rubber-based material.