JP2010085549A - Liquid crystal device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device which allows an optical sheet to be prevented from waving in a high-temperature test or a high-temperature high-humidity test without adding a member and without making the optical sheet thicker, and to provide an electronic apparatus including the liquid crystal device. <P>SOLUTION: In the liquid crystal device 100, a liquid crystal panel 1 and a step part 911 of a frame 9 are directly bonded by a double-sided tape 28, and a prism sheet 25 is disposed in a position lower than the step part 911. Accordingly, an outer circumferential edge 25f of the prism sheet 25 is not in contact with the double-sided tape 28 and is not fixed throughout a part to which the liquid crystal panel 1 is fixed by the double-sided tape 28, of the step part 911. Thus the prism sheet 25 can be prevented from waving in a high-humidity test or a high-temperature high-humidity test without adding a new member and without making the optical sheet thicker. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a liquid crystal device held on a liquid crystal panel inside a frame, and an electronic apparatus including the liquid crystal device.

In general, as shown in FIG. 10, a transmissive or transflective liquid crystal device has a reflective plate 27, a backlight light guide plate 6, a scattering plate 23, and a thickness of 62 μm inside a resin frame 91.
m prism sheet 24, prism sheet 25 having a thickness of about 65 μm, lower polarizing plate 42
In addition, the liquid crystal panel 1 and the upper polarizing plate 41 are sequentially stacked. On the inner peripheral side surface of the resin frame 91, a step 911 extends along the outer edge of the liquid crystal panel 1, and the back side end of the liquid crystal panel 1 is supported by the step 911. Further, a lower polarizing plate 42 is adhered to the back surface of the liquid crystal panel 1 by an adhesive layer 51, and the lower polarizing plate 42
A double-sided tape 28 is disposed between the back surface side of the paper and the step portion 911. Therefore, the liquid crystal panel 1 is fixed to the step portion 911 of the resin frame 9 via the double-sided tape 28 and the lower polarizing plate 42. Here, the lower surface of the double-sided tape 28 is also bonded to the outer peripheral end of the prism sheet 25. In the liquid crystal device having such a configuration, when the high temperature test or the high temperature and high humidity test is performed, the prism sheet 25 may swell due to thermal expansion or the like. Such waviness is not preferable because it disturbs the orientation angle of the emitted light by the prism sheet 25 and lowers the quality of the display image.

In view of this, it has been proposed to insert a non-polarizing optical sheet between the prism sheet 25 and the lower polarizing plate 42 (see Patent Document 1).
JP 2008-130233 A

However, as in the configuration described in Patent Document 1, the prism sheet 25 and the lower polarizing plate 42 are used.
If a non-polarizing optical sheet is added between the two, the thinning and cost reduction of the liquid crystal device will be hindered. As a measure for preventing the swell of the prism sheet 25, the prism sheet 25
It is conceivable to increase the thickness of the liquid crystal panel to about 140 μm.
This is not preferable because it obstructs the reduction in thickness and cost.

In view of the above problems, an object of the present invention is to provide a liquid crystal device capable of preventing undulation of an optical sheet in a high temperature test or a high temperature and high humidity test without adding a member or increasing the thickness of the optical sheet. And providing an electronic apparatus including a liquid crystal device.

In order to solve the above problems, a liquid crystal device according to the present invention accommodates a liquid crystal panel, a lower polarizing plate disposed on the back surface of the liquid crystal panel, the liquid crystal panel and the lower polarizing plate inside, The step part supporting the rear side edge of the liquid crystal panel has a frame extending along the outer edge of the liquid crystal panel, the lower surface is bonded to the upper surface of the step part, and the upper surface is bonded to the liquid crystal panel The double-sided tape is disposed inside the frame so as to overlap the lower surface of the lower polarizing plate, and at any one of the two locations where the outer peripheral ends face each other, at least one location is not in contact with the double-sided tape. It is characterized by that.

In the present invention, “adhesion” means “adhesion”. In the present invention, the “location facing each other at the outer peripheral edge of the optical sheet” refers to an imaginary line that touches an arbitrary outer peripheral edge of the optical sheet from a location in contact with the outer peripheral edge of the optical sheet. When the normal line is drawn, it means a portion that touches at the outer peripheral end of the other side. Accordingly, in the present invention, when the optical sheet is rectangular, at two sides facing each other at the outer peripheral edge of the optical sheet, at least one of the two sides facing each other is at least one with respect to the double-sided tape. In a non-contact state.

As a result of various studies by the inventors of the present invention on the causes and countermeasures of waviness of the optical sheet in the high-temperature test and the high-temperature and high-humidity test, two opposing portions at either end of the outer periphery of the optical sheet are fixed in contact with the double-sided tape. New findings have been obtained that swells occur. That is, it was found that undulation occurs when both ends of the optical sheet are fixed in contact with the double-sided tape. In the present invention, based on such knowledge, in the relationship between the double-sided tape for fixing the frame and the liquid crystal panel and the optical sheet, at least one of the two opposite positions at the outer peripheral edge of the optical sheet is at least one of them. A configuration in which the part is in a non-contact state is adopted.
According to such a configuration, the stress applied to the optical sheet can be absorbed by the displacement of the optical sheet during the high-temperature test and the high-temperature and high-humidity test, so that no undulation occurs in the optical sheet. Therefore, according to the present invention, the undulation of the optical sheet in the high temperature test and the high temperature and high humidity test can be prevented without adding a new member or increasing the thickness of the optical sheet. Therefore, the reliability of the liquid crystal device can be improved without hindering the thinning and cost reduction of the liquid crystal device.

In the present invention, the optical sheet is a prism sheet. Such a prism sheet improves the front luminance by adjusting the orientation angle of the emitted light.

In this invention, it is preferable that the whole outer peripheral edge part of the said optical sheet exists in a non-contact state with respect to the said double-sided tape. According to such a configuration, the undulation of the optical sheet in the high temperature test and the high temperature and high humidity test can be surely prevented.

In the present invention, at a location where the optical sheet is not in contact with the double-sided tape, the position where the inner edge of the double-sided tape overlaps the inner edge of the stepped portion, or the inner edge of the stepped portion. Preferably it is on the outside. If comprised in this way, since the inner edge of a double-sided tape does not protrude inside from the inner edge of a step part, a contact with an optical sheet and a double-sided tape can be avoided reliably.

In the present invention, the lower polarizing plate is disposed at least inside the stepped portion, the optical sheet is disposed at a position lower than the upper surface of the stepped portion, and the upper surface of the double-sided tape is a back surface of the liquid crystal panel. It is possible to adopt a configuration in which the side ends are directly bonded. When the lower polarizing plate is disposed on the inner side of the step portion, the optical sheet is disposed at a lower position, so that the contact between the optical sheet and the double-sided tape can be reliably avoided.

In this invention, it is preferable that the said step part is provided with the protrusion which protruded inward from the upper end part, and the outer peripheral edge part of the said optical sheet is contact | abutting on the lower surface of the said protrusion. If comprised in this way, a contact with an optical sheet and a double-sided tape can be avoided reliably. Further, since the optical sheet can be pressed by the protrusion, the optical sheet can be prevented from floating.

In this invention, you may employ | adopt the structure which the location which opposes the location which is in a contact state with respect to the said double-sided tape in the outer peripheral edge part of the said optical sheet is a non-contact state with respect to the said double-sided tape. .

A liquid crystal device to which the present invention is applied is used in electronic devices such as a mobile computer, a mobile phone, a car navigation system, and a personal computer.

Embodiments of the present invention will be described with reference to the drawings. In the drawings to be referred to in the following description, the scales are different for each layer and each member so that each layer and each member have a size that can be recognized on the drawing. Further, in the following description, common members are described with the same reference numerals so that the correspondence with the configuration shown in FIG. 10 can be easily understood.

[Embodiment 1]
First, a configuration in which both are in a non-contact state with respect to the double-sided tape at any two locations facing each other at the outer peripheral end of the prism sheet used as the optical sheet will be described.

(Overall configuration of liquid crystal device)
1 and 2 are a plan view and an exploded perspective view, respectively, of the liquid crystal device according to Embodiment 1 of the present invention. 3 (a) and 3 (b) show the liquid crystal device according to Embodiment 1 of the present invention.
It is sectional drawing which shows typically a mode when it cut | disconnects in the position corresponded to the A1-A1 'line and B1-B1' line. 4 shows the liquid crystal device according to Embodiment 1 of the present invention, as shown in FIG.
It is sectional drawing when cut | disconnecting in the position corresponded to 1 'line. In FIGS. 1A and 1B,
A pasting range of a double-sided tape 28 to be described later is shown as an area to which a group of three slanting lines on the right is attached. Further, in FIGS. 1A and 1B, an inner edge of a step portion 911 described later is indicated by a one-dot chain line.

As shown in FIGS. 1, 2, 3 (a) and 3 (b), a liquid crystal device 100 of this embodiment is arranged on a transmissive or transflective liquid crystal panel 1 and on the back side of the liquid crystal panel 1. The illumination device 8 (backlight device) is provided, and the illumination device 8 and the liquid crystal panel 1 are held inside a frame 9 having a planar rectangular shape. The frame 9 is a rectangular frame-shaped resin frame 9
1 and a box-shaped metal frame 92 that supports the resin frame 91 on the outside. The frame 9 having such a configuration can be configured by forming the resin frame 91 and the metal frame 92 separately and then superposing them. Further, the frame 9 can be configured such that the resin frame 91 and the metal frame 92 are integrated by insert molding or outsert molding of the metal frame 92. In this embodiment, the resin frame 9 is made of polycarbonate resin or the like.

The liquid crystal panel 1 has a rectangular planar shape, and the resin frame 91 includes four side plate portions 917 a, 917 b, 917 c, and 917 d along the outer edge of the liquid crystal panel 1. 4
Among the two side plate portions 917a, 917b, 917c, and 917d, a concave portion 914 is formed in one side plate portion 917d that is located on the drawer side of the flexible substrate 7, and the remaining three side plate portions 9 are provided.
On the inner side of 17a, 917b and 917c, a step portion 911 for supporting the liquid crystal panel 1 on the upper surface is formed. The stepped portion 911 includes three side plate portions 9 excluding the side plate portion 917d positioned on the pull-out side of the flexible substrate 7 among the four side plate portions 917a, 917b, 917c, and 917d.
17a, 917b and 917c are formed continuously on the inner peripheral side surface, and have a structure extending along the outer edge of the liquid crystal panel 1 with a certain width dimension. Note that, in the resin frame 91, the vicinity of the side plate portion 917 d located on the pull-out side of the flexible substrate 7 is a discontinuous portion 915 of the step portion 911, and the step portion 911 is not formed. In this embodiment, the step portion 911 has a shape that protrudes inward from a midway position in the height direction of the three side plate portions 917a, 917b, and 917c, and is provided at the lower end portion of the three side plate portions 917a, 917b, and 917c. ,
It is a recessed part which can receive the protrusion part 6s of the light-guide plate 6 mentioned later.

The metal frame 92 includes a rectangular bottom plate portion 925 and four side plate portions 927 that stand on the outer edge of the bottom plate portion 925, and one side plate portion 927 located on the drawer side of the flexible substrate 7 includes: A recess 924 is formed. An opening may be formed in the bottom plate portion 925 of the metal frame 92.

The liquid crystal panel 1 includes a rectangular element substrate 11 and a first surface 11a (one surface) of the element substrate 11.
And a rectangular frame-shaped sealing material 13 for bonding the element substrate 11 and the counter substrate 12 to each other at the periphery of the substrate. The element substrate 11, the counter substrate 12, and the sealing material The liquid crystal layer 14 held in the space formed by 13 is held. The element substrate 11 includes an overhang region 18 that protrudes from the end of the counter substrate 12. In this embodiment, both the element substrate 11 and the counter substrate 12 are translucent insulating substrates such as glass.

In the element substrate 11, an island-shaped ITO (Indi ITO) is formed on the first surface 11 a facing the counter substrate 12.
A pixel electrode 16 made of an um Tin Oxide (Ium) oxide film or an IZO (Indium Zinc Oxide) film, a pixel switching element, a signal line (not shown) such as a scanning line or a data line, and the like are formed.
An alignment film (not shown) made of polyimide or the like is formed so as to cover 6. In this embodiment, the liquid crystal panel 1 includes in-plane switching (hereinafter referred to as IPS (In Plane Switching)).
And fringe field switching (hereinafter referred to as FFS (Fringe Field Switc)
hing)), and the liquid crystal layer 14 is driven by a lateral electric field. Therefore,
A common electrode 17 made of an ITO film or an IZO film is also formed on the element substrate 11. For this reason, the common electrode 17 is not formed on the first surface 12 a of the counter substrate 12 that faces the element substrate 11. In the case of the IPS method, a configuration in which the pixel electrode 16 and the common electrode 17 face each other in the lateral direction is adopted. In the case of the FFS method, the pixel electrode 16 and the common electrode 17 are formed in different layers above and below the dielectric film. Configuration is adopted. However, in FIGS. 3A and 3B, the FF
In the case of the S method, similarly to the IPS method, the pixel electrode 16 and the common electrode 17 are schematically shown so as to face each other in the horizontal direction. A color filter (not shown) or the like may be formed on the first surface 12 a of the counter substrate 12. Further, in the liquid crystal device 100 of this embodiment, the liquid crystal panel 1 is TN (
In some cases, a liquid crystal panel of a Twisted Nematic (ECB) method, an ECB (Electrically Controlled Birefringence) method, or a VAN (Vertical Aligned Nematic) method is used. In this case, the pixel electrode 16 is formed on the element substrate 11 and the counter substrate 12 is formed. A common electrode is formed.

In the liquid crystal panel 1, the counter substrate 12 has a first surface 12 that faces the element substrate 11.
The upper polarizing plate 41 is disposed so as to overlap the second surface 12b on the side opposite to a, and the element substrate 11 has a second surface 11b opposite to the first surface 11a facing the counter substrate 12 (other than the element substrate 11). The lower polarizing plate 42 is disposed on the side of the (direction).

In the liquid crystal device 100 configured as described above, the light emitted from the illumination device 8 is emitted from the element substrate 11.
The incident light is modulated, and the incident light is modulated and emitted from the counter substrate 12 side to display an image.

As shown in FIGS. 1, 2, and 3 (a), a driving IC 98 is mounted on the projecting region 18 of the element substrate 11 with an anisotropic conductive film or the like. A flexible substrate 7 is connected to the end of the overhang region 18. Therefore, various signals and power supplied from the outside can be input to the liquid crystal panel 1 through the flexible substrate 7. In the flexible substrate 7, a band-shaped portion 72 extends from the main body portion 78, and a light source mounting portion 71 whose longitudinal direction is in the width direction of the liquid crystal panel 1 is formed at the tip of the band-shaped portion 72. The point light source 3 of the illumination device 8 is mounted on the light source mounting portion 71, and an electronic component 35 such as a surface mount capacitor is mounted on the surface of the flexible substrate 7 where the point light source 3 is mounted. ing. In this embodiment, the point light source 3 is a surface-mounted white LED, and a plurality of point light sources 3 are mounted at predetermined intervals with the outgoing optical axis L directed in a direction parallel to the surface of the light source mounting portion 71 of the flexible substrate 7. ing. The flexible substrate 7 is a multilayer substrate or a double-sided substrate, and overlaps the area where the point light source 3 is mounted in plan view when the light source mounting portion 71 is viewed from the side opposite to the side where the point light source 3 is mounted. A conductive pattern 742 is formed in the region. The conductive pattern 742 is a solid ground pattern, and is formed on one surface without a gap over a predetermined region. Such a conductive pattern 742 is used for light shielding, electromagnetic shielding, or heat dissipation for the point light source 3.

(Overall configuration of lighting device 8)
The illuminating device 8 includes a substantially rectangular light guide plate 6 with the light emission surface 6a facing the element substrate 11 of the liquid crystal panel 1.
And a plurality of point light sources 3 made of white LEDs arranged along the end portion 6 e of the light guide plate 6. In the illuminating device 8, the reflection plate 27 is disposed so as to overlap the back surface 6 b of the light guide plate 6 opposite to the light emitting surface 6 a. In the illuminating device 8, a rectangular scattering plate 23, a rectangular prism sheet 24, and a rectangular prism sheet 25 are sequentially stacked on the light emitting surface 6 a side of the light guide plate 6.

The light guide plate 6 is for uniformly irradiating the light emitted from the point light source 3 on the surface of the liquid crystal panel 1 and is made of a light-transmitting material such as acrylic resin or polycarbonate. Scatter plate 23
Is for making the luminance of light in the display screen more uniform. Prism sheet 24,
No. 25 improves the front luminance by adjusting the orientation angle of the emitted light. In this embodiment, the prism sheet 24 has a thickness of about 62 μm, and the prism sheet 25 has a thickness of 65 μm.
It is about μm. As the prism sheets 24 and 25, a trade name “BEF series” manufactured by Sumitomo 3M Co., Ltd. may be used.

In this embodiment, at the lower end portion of the light guide plate 6, three side plate portions 917a of the resin frame 91,
Protruding portions 6 s are provided at positions corresponding to 917 b and 917 c, and when the light guide plate 6 is mounted inside the resin frame 91, the protruding portions 6 s enter below the stepped portion 911. In the end portion 6e of the light guide plate 6, a notch-shaped light source arrangement hole 61 is formed at a predetermined interval along the side,
One of the inner walls serves as a light incident portion 61a on which light emitted from the point light source 3 enters. Therefore, in the flexible substrate 7, the band-shaped portion 72 is bent so that the surface of the light source mounting portion 71 on which the point light source 3 is mounted faces downward, and the light source mounting portion 71 is attached to the end portion 6 e of the light guide plate 6. When overlapped, the plurality of point light sources 3 are each arranged in the light source arrangement hole 61 with the light emitting surface 3a facing the light incident portion 61a. A light shielding sheet 29 is attached along the upper surface of the end portion 6 e of the light guide plate 6. A rectangular opening 291 is formed in the light shielding sheet 29 at a position overlapping the light source arrangement hole 61 of the light guide plate 6 in plan view. Accordingly, the flexible substrate 7 is placed on the light shielding sheet 29.
When the light source mounting portions 71 are stacked, the plurality of point light sources 3 are respectively arranged in the light source arrangement holes 61 through the openings 291. If an adhesive layer is formed on both sides of the light shielding sheet 29,
The light source mounting portion 71 of the flexible substrate 7 can be fixed to the end portion 6 e of the light guide plate 6.

(Fixing structure of the liquid crystal panel 1 to the frame 9)
5 (a) and 5 (b) respectively show the liquid crystal device according to Embodiment 1 of the present invention, indicated by E1-E in FIG.
It is sectional drawing when cut | disconnecting in the position corresponded to 1 'line, and sectional drawing when cut | disconnected in the position equivalent to F1-F1' line of FIG. Here, the E1-E1 'line in FIG. 1 and the F1-F line in FIG.
The 1 'line is in a positional relationship for cutting two opposite positions.

In the liquid crystal device 100 of this embodiment, when the liquid crystal panel 1 is fixed to the inside of the frame 9, as shown in FIGS. 1, 2, 3 (a), (b) and FIGS. 5 (a), (b). The back side edge of the liquid crystal panel 1 is supported by step portions 911 formed on the side plate portions 917a, 917b, and 917c of the resin frame 91, and the double-sided tape 28 is disposed between the step portion 911 and the liquid crystal panel 1. . The double-sided tape 28 includes side plate portions 917a, 917b of the resin frame 91,
Three strips 28a, 28b, 28c are provided on each of 917c, and the three strips 28a, 28b, 28c extend with a certain width dimension. Such a double-sided tape 28 includes an adhesive layer on both sides of a film substrate. Therefore, the lower surface of the double-sided tape 28 is bonded to the step 911 of the frame 9 and the upper surface is bonded to the liquid crystal panel 1 side.

As shown in FIGS. 5A and 5B, in the resin frame 91, the opposing side plate portions 91 are opposed to each other.
In both 7a and 917c, a small protrusion 911t protruding inward from the upper end portion of the step portion 911 is formed. Here, the lower polarizing plate 42 has a size that falls within a region surrounded by the inner edge 911 f of the step portion 911. On the other hand, the reflection plate 27, the light guide plate 6, the scattering plate 23, and the prism sheets 24 and 25, which are stacked on the lower surface side of the lower polarizing plate 42, are stepped portions 91.
The size is slightly larger than the area surrounded by the inner end edge 911f of one.

The prism sheet 25, the prism sheet 24, the scattering plate 23, and the light guide plate 6 are attached to the inside of the resin frame 91 in order from below. Alternatively, after the light guide plate 6 is mounted below the resin frame 91, the reflection plate 27 is placed on the lower surface of the resin frame 9, and then the scattering plate 23, the prism sheet 24, and the prism sheet 25 are slightly bent to protrude. Part 911t
The light guide plate 6 is overlaid on the upper surface of the light guide plate 6. In any of these assembling methods, the outer peripheral end portion 25f of the prism sheet 25, which is the uppermost layer of the scattering plate 23 and the prism sheets 24 and 25, abuts on the inner end portion of the protrusion 911t. This state is maintained.

In such a structure, since the lower polarizing plate 42 is disposed inside the step portion 911, the scattering plate 23 and the prism sheets 24 and 25 are positioned below by the thickness thereof. For this reason, among the scattering plate 23 and the prism sheets 24 and 25, the prism sheet 2 stacked on the uppermost layer.
5, the upper surface is at a position lower than the upper surface of the stepped portion 911.

In this embodiment, the double-sided tape 28 is a light shielding tape having a thickness of 50 to 60 μm, and the lower surface side of the film base is a white or silver reflecting surface, while the upper surface of the film base is black light. It is an absorption surface. The double-sided tape 28 is smaller in width than the step 911,
The inner edge 28f of the double-sided tape 28 is located slightly outside the inner edge 911f of the step portion 911. The lower polarizing plate 42 is disposed inside the step portion 911. For this reason, double-sided tape 2
The upper surface of 8 is directly bonded to the back surface of the liquid crystal panel 1.

Further, the prism sheet 25 is located at a position lower than the upper surface of the stepped portion 911, and the outer peripheral end portion 25.
f is in a state of being in contact with the lower surface of the protrusion 911t. For this reason, in the side plate portions 917 a and 917 c located on the opposite sides of the resin frame 91, the outer peripheral end portion 25 f of the prism sheet 25 is in a non-contact state with the double-sided tape 28. In this embodiment, the same structure as that shown in FIGS. 5A and 5B is adopted over the entire length of the side plates 917a and 917c of the resin frame 91. For this reason, the side plate part 9 located in the side part which the resin frame 91 opposes mutually.
The outer peripheral end portion 25f of the prism sheet 25 is in a non-contact state with the double-sided tape 28 over the entire 17a, 917c. Further, in the side plate portion 917b of the resin frame 91 shown in FIG.
A structure similar to that shown in FIGS. 5A and 5B is employed. For this reason, in this embodiment, the outer peripheral end portion 25f of the prism sheet 25 is not in contact with the double-sided tape 28 and is fixed by the double-sided tape 28 over all the places where the liquid crystal panel 1 is fixed by the double-sided tape 28. Absent.

(Assembly method of liquid crystal device 100)
In order to assemble the liquid crystal device 100 of this embodiment, first, the reflecting plate 27, the light guide plate 6, the scattering plate 23, the prism sheet 24, and the prism sheet 25 are stacked inside the resin frame 91, and then the prism sheet 25. The lower polarizing plate 42 is overlaid on the top.

Next, the light shielding sheet 29 is overlapped so as to cover the end portion 6 e of the light guide plate 6. Such light shielding sheet 2
For 9, since it is a double-sided tape, the light shielding sheet 29 is bonded to the end 6 e of the light guide plate 6. Next, in the flexible substrate 7, the point light source 3 of the light source mounting portion 71.
The point light source 3 is arranged at the end 6e of the light guide plate 6 by bending the belt-like portion 72 so that the surface on which the light is mounted is directed downward. At that time, the light source mounting portion 71 is pressed against the light shielding sheet 29, and the light source mounting portion 71 is fixed to the end portion 6 e of the light guide plate 6. As a result, the lighting device 8 is completed.

On the other hand, the upper polarizing plate 41 is bonded to the surface of the liquid crystal panel 1. And after sticking the double-sided tape 28 along the outer edge on the back surface side of the liquid crystal panel 1, the liquid crystal panel 1 is placed on the step 911 so that the double-sided tape 28 overlaps the step 911 of the frame 9. Deploy. Then, the liquid crystal panel 1 is pressed against the step portion 911, and the lower surface of the double-sided tape 28 is bonded to the step portion 911, and the upper surface of the double-sided tape 28 is directly bonded to the back surface of the liquid crystal panel 1. Instead of the above method, the liquid crystal panel 1 may be disposed on the step portion 911 after the double-sided tape 28 is bonded onto the step portion 911. Even when this method is adopted, when the liquid crystal panel 1 is pressed against the step portion 911, the lower surface of the double-sided tape 28 adheres to the step portion 911 and the upper surface of the double-sided tape 28 directly adheres to the back surface of the liquid crystal panel 1.

(Main effects of this form)
As described above, in the liquid crystal device 100 of the present embodiment, the double-sided tape 2 is formed at the step portion 911.
8, the outer peripheral end 25 f of the prism sheet 25 is in a non-contact state with the double-sided tape 28 over all the places where the liquid crystal panel 1 is fixed by 8. Therefore, the condition that at least one of the two locations facing each other at the outer peripheral end portion 25 f of the prism sheet 25 is in a non-contact state with respect to the double-sided tape 28 is satisfied. For this reason, the swell of the prism sheet 25 in the high temperature test and the high temperature and high humidity test can be prevented without adding a new member or increasing the thickness of the optical sheet. Therefore, the reliability of the liquid crystal device 100 can be improved without hindering the reduction in thickness and cost of the liquid crystal device 100.

In particular, in this embodiment, the outer peripheral end portion 25f of the prism sheet 25 is not in contact with the double-sided tape 28 and is not fixed over the entire portion where the liquid crystal panel 1 is fixed by the double-sided tape 28 in the step portion 911. . Therefore, the swell of the prism sheet 25 in the high temperature test and the high temperature and high humidity test can be surely prevented.

In this embodiment, the inner end edge 28f of the double-sided tape 28 is outside the inner end edge of the stepped portion 911, and the inner end edge 28f of the double-sided tape 28 is completely overhanging from the inner end edge 911f of the stepped portion 911. Not. Further, since the lower polarizing plate 42 is disposed inside the step portion 911, the prism sheet 25 is disposed at a position lower than the upper surface of the step portion 911. Therefore, contact between the prism sheet 25 and the double-sided tape 28 can be reliably avoided.

Moreover, since the upper surface of the double-sided tape 28 is directly bonded to the rear surface side end portion of the liquid crystal panel 1, even if the lower polarizing plate 42 is disposed inside the step portion 911, the double-sided tape 28.
Thus, the liquid crystal panel 1 can be securely fixed to the stepped portion 911. Therefore, it is possible to reliably prevent the liquid crystal panel 1 from being peeled off or lifted from the frame 9. Therefore, since the liquid crystal panel 1 does not have to be sandwiched between the upper metal frame and the frame 9, the upper metal frame can be omitted. In addition, since it is not necessary to fix the liquid crystal panel 1 and the lower polarizing plate 42 with an adhesive layer, the number of manufacturing steps can be reduced, so that the cost can be reduced. Further, since the adhesive layer for fixing the liquid crystal panel 1 and the lower polarizing plate 42 can be omitted, the liquid crystal device 10 correspondingly.
It is possible to reduce the thickness to zero.

Further, in this embodiment, the step portion 911 is a protrusion 911t protruding inward at the upper end portion.
The outer peripheral end 25f of the prism sheet 25 is in contact with the lower surface of the protrusion 911t.
For this reason, it is possible to reliably avoid contact between the prism sheet 25 and the double-sided tape 28. Further, since the prism sheet 25 can be pressed by the protrusions 911t, the prism sheet 25 can be prevented from floating.

[Embodiment 2]
With reference to FIGS. 6-8, the outer peripheral edge part 25f of the prism sheet 25 used as an optical sheet
A configuration in which a portion facing a portion in contact with the double-sided tape 28 is in a non-contact state with respect to the double-sided tape 28 will be described.

FIG. 6 is a plan view of the liquid crystal device 100 according to Embodiment 2 of the present invention. 7 (a), (
b) is an exploded perspective view of members such as the frame 9 used in the liquid crystal device according to the second embodiment of the present invention as viewed from the side plate portion 217c, and an exploded perspective view as viewed from the side plate portion 217a on the opposite side. FIG. 8A and 8B are cross-sectional views when the liquid crystal device according to Embodiment 2 of the present invention is cut at a position corresponding to the line E2-E2 ′ of FIG. 6, and F2 of FIG. -F2 '
It is sectional drawing when cut | disconnecting in the position corresponded to a line | wire. Here, the E2-E2 ′ line in FIG. 6 and the F2-F2 ′ line in FIG. 6 are in a positional relationship of cutting two opposite positions. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

As shown in FIGS. 6, 7A and 7B, and FIGS. 8A and 8B, the liquid crystal device 100 according to the present embodiment is also transmissive or transflective as in the first embodiment. Liquid crystal panel 1 and a lighting device 8 disposed on the back side of the liquid crystal panel 1. The lighting device 8 and the liquid crystal panel 1 are held inside a frame 9 having a rectangular shape. The frame 9 includes a rectangular frame-shaped resin frame 91 and a box-shaped metal frame 92 that supports the resin frame 91 on the outside.
It consists of. The resin frame 91 has four side plate portions 917a, 917b, 917c, 917.
d, and a step portion 911 for supporting the liquid crystal panel 1 on the upper surface is formed inside the side plate portions 917a, 917b, and 917c.

In the liquid crystal panel 1, in the counter substrate 12, the upper polarizing plate 41 is disposed on the second surface 12 b opposite to the first surface 12 a facing the element substrate 11.
On the side of the second surface 11 b opposite to the first surface 11 a facing 2, a lower polarizing plate 42 is disposed so as to overlap. In this embodiment, the lower polarizing plate 42 is fixed to the back surface of the liquid crystal panel 1 with an adhesive layer 51.

Also in the present embodiment, as in the first embodiment, the illumination device 8 includes a rectangular scattering plate 23, a rectangular prism sheet 24, and a rectangular prism plate 24 on the upper surface (light emitting surface 6a) side of the substantially rectangular light guide plate 6. A rectangular prism sheet 25 is sequentially stacked. The thickness of the prism sheet 24 is about 62 μm, and the thickness of the prism sheet 25 is about 65 μm.

In the liquid crystal device 100 of this embodiment, when the liquid crystal panel 1 is fixed to the inside of the frame 9, the step portions 911 formed on the side plate portions 917 a, 917 b, and 917 c of the resin frame 91.
As a result, the back side edge of the liquid crystal panel 1 is supported, and a double-sided tape 28 is disposed between the step 911 and the liquid crystal panel 1 side. Therefore, the upper surface of the double-sided tape 28 is bonded to the liquid crystal panel 1 side, and the lower surface of the double-sided tape 28 is bonded to the upper surface of the step portion 911. However, in this embodiment, the lower polarizing plate 42 is bonded to the back surface of the liquid crystal panel 1, and the outer peripheral end portion of the lower polarizing plate 42 overlaps the stepped portion 911. For this reason, the upper surface of the double-sided tape 28 is bonded to the liquid crystal panel 1 via the lower polarizing plate 42. The double-sided tape 28 is a light shielding tape having a thickness of 50 to 60 μm,
The lower surface side of the film substrate is a white or silver reflecting surface, while the upper surface side of the film substrate is a black light absorbing surface.

In this embodiment, of the side plate portions 917a and 917c facing each other in the resin frame 91,
The step portion 911 formed in the side plate portion 917c has three notches 917x, 91 recessed outward.
7y and 917z are formed. Further, in the prism sheet 25, the prism sheet 24, and the scattering plate 23, protrusions 25x, 2x are formed on the outer peripheral end portion located on the side plate portion 917c side.
4y and 23z are formed. Therefore, when the scattering plate 23, the prism sheet 24, and the prism sheet 25 are stacked inside the resin frame 91, if the protrusions 25x, 24y, and 23z are fitted into the notches 917x, 917y, and 917z, the scattering plate 23 and the prism sheet 24,
And the direction of the prism sheet 25 can be matched.

However, when such a configuration is adopted, the upper surface of a part (projection 25x) of the outer peripheral end portion 25f of the prism sheet 25 is exposed inside the notch 917x in the stepped portion 911. Also,
In this embodiment, since the upper surface of the double-sided tape 28 is bonded to the lower surface of the lower polarizing plate 42, the upper surface of the outer peripheral end portion 25f of the prism sheet 25 is at the same height as the upper surface of the step portion 911. Furthermore, although the width dimension of the double-sided tape 28 is smaller than the width dimension of the step portion 911, the inner edge 28f of the double-sided tape 28 is formed in the region where the notches 917x, 917y, 917z are formed.
However, it is located inside the inner end edge 911f of the step portion 911. For this reason, a part (projection 25x) of the outer peripheral end 25f of the prism sheet 25 comes into contact with and adheres to the lower surface of the double-sided tape 28 inside the notch 917x.

However, in this embodiment, the notch 917x is formed in the step portion 911 formed in the side plate portion 917c, but the prism sheet 25 is provided in the side plate portion 917a facing the side plate portion 917c.
The notch 917x into which the protrusion 25x enters is not formed. Therefore, the side plate portion 917
On the side a, the inner end edge 28f of the double-sided tape 28 is located outside the inner end edge 911f of the stepped portion 911, and therefore the outer peripheral end portion 25f of the prism sheet 25 is not in contact with the double-sided tape 28.

Thus, in this embodiment, the outer peripheral end 25 of the prism sheet 25 is provided on the side plate 917c side.
Part of f (protrusion 25x) contacts and adheres to the lower surface of the double-sided tape 28 inside the notch 917x, but contact between the prism sheet 25 and the double-sided tape 28 occurs at the side plate portion 917a side. do not do. Therefore, even in the liquid crystal device 100 of the present embodiment, the condition that at least one location is in a non-contact state with respect to the double-sided tape 28 in any two locations facing each other at the outer peripheral end portion 25f of the prism sheet 25 is satisfied. . For this reason, the swell of the prism sheet 25 in the high temperature test and the high temperature and high humidity test can be prevented without adding a new member or increasing the thickness of the optical sheet. Therefore, the reliability of the liquid crystal device 100 can be improved without hindering the reduction in thickness and cost of the liquid crystal device 100.

[Other embodiments]
Also in the first embodiment, the notch 917x described with reference to FIGS. 7 and 8 is formed in the step portion 911 of the resin frame 91, and the protrusion 25x is formed in the outer peripheral end portion 25f of the prism sheet 25. May be. At that time, there are no restrictions on the number and formation positions of the notches 917x and the protrusions 25x. That is, in Embodiment 1, since the prism sheet 25 is located at a position lower than the upper surface of the step portion 911, the outer peripheral end portion 25f of the prism sheet 25 is in contact with the double-sided tape 28 even if the notch 917x and the protrusion 25x are formed. There is nothing.

In the second embodiment, the notch 917x is formed in the step portion 911 in the side plate portion 917c of the resin frame 91, and the notch 917x is formed in the side plate portion 917a facing the side plate portion 917c.
Is not formed. However, the notch 917x may also be formed in the side plate portion 917a as long as it is shifted from the location facing the notch 917x of the side plate portion 917c. Even when such a configuration is adopted, any two facing each other at the outer peripheral end 25f of the prism sheet 25 can be used.
The location satisfies the condition that at least one location is not in contact with the double-sided tape 28. Therefore, without adding new members or thickening the optical sheet,
Swelling of the prism sheet 25 in a high temperature test or a high temperature and high humidity test can be prevented.

In the first and second embodiments, the double-sided tape 28 has a width dimension smaller than that of the step portion 911, and the inner end edge 28f of the double-sided tape 28 is positioned slightly outside the inner end edge 911f of the step portion 911. However, a configuration in which the inner end edge 28f of the double-sided tape 28 overlaps with the inner end edge 911f of the stepped portion 911 may be adopted.

In the first and second embodiments, since the prism sheet 25 is rectangular, the prism sheet 2
The two locations facing each other at the outer peripheral end 25f of No. 5 try to be at locations facing each other at the two opposing sides. However, the present invention can be applied even when the prism sheet 25 has a shape other than a rectangle. In such a case, the opposite position at the outer peripheral end portion 25f of the prism sheet 25 is the outer peripheral end portion 25f of the prism sheet 25 with respect to a virtual line that is in contact with any one of the outer peripheral end portions 25f of the prism sheet 25. When a virtual normal line is drawn from a location in contact with, this means a location in contact with the outer peripheral end 25f on the other side. For example, prism sheet 25
In the case where there is an arc portion at the outer peripheral end portion 25f, for a virtual line in contact with one place of the arc portion,
When a virtual normal is drawn from a location in contact with the outer peripheral end 25f of the prism sheet 25, a location in contact with the outer peripheral end 25f on the other side is a “facing location”.

[Example of mounting on electronic devices]
Next, an electronic apparatus to which the liquid crystal device 100 according to the above-described embodiment is applied will be described.
FIG. 9A shows the configuration of a mobile personal computer including the liquid crystal device 100. The personal computer 2000 includes a liquid crystal device 100 as a display unit and a main body 2010. A main body 2010 includes a power switch 2001 and a keyboard 2002.
Is provided. FIG. 9B shows a configuration of a mobile phone provided with the liquid crystal device 100. The cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the liquid crystal device 100 as a display unit. By operating the scroll button 3002, the screen displayed on the liquid crystal device 100 is scrolled. FIG. 9C shows the configuration of a personal digital assistant (PDA) to which the liquid crystal device 100 is applied. The information portable terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002,
In addition, a liquid crystal device 100 as a display unit is provided. When the power switch 4002 is operated, various kinds of information such as an address book and a schedule book are displayed on the liquid crystal device 100.

As electronic devices to which the liquid crystal device 100 is applied, in addition to those shown in FIG. 9, a digital still camera, a liquid crystal television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator Electronic devices such as word processors, workstations, videophones, POS terminals and bank terminals. And the liquid crystal device 100 mentioned above is applicable as a display part of these various electronic devices.

It is a top view of the liquid crystal device which concerns on Embodiment 1 of this invention. 1 is an exploded perspective view of a liquid crystal device according to Embodiment 1 of the present invention. (A), (b) each schematically shows a state where the liquid crystal device according to the first embodiment of the present invention is cut at positions corresponding to the A1-A1 ′ line and the B1-B1 ′ line in FIG. FIG. FIG. 2 is a cross-sectional view of the liquid crystal device according to Embodiment 1 of the present invention when cut at a position corresponding to the line C1-C1 ′ of FIG. (A), (b) is sectional drawing when the liquid crystal device based on Embodiment 1 of this invention is cut | disconnected in the position equivalent to the E1-E1 'line of FIG. 1, respectively, and F1-F1 of FIG. It is sectional drawing when cut | disconnecting in the position corresponded to a line. It is a top view of the liquid crystal device which concerns on Embodiment 2 of this invention. (A), (b) is the exploded perspective view which looked at members, such as a frame used for the liquid crystal device concerning Embodiment 2 of the present invention from the side of one side plate part, and it looked from the side of the opposite side plate part It is a disassembled perspective view. FIGS. 6A and 6B are a cross-sectional view of the liquid crystal device according to the second embodiment of the present invention cut at a position corresponding to the line E2-E2 ′ of FIG. 6, and F2-F2 of FIG. It is sectional drawing when cut | disconnecting in the position corresponded to a line. It is explanatory drawing of the electronic device using the display apparatus with an input function which concerns on this invention. It is sectional drawing of the conventional liquid crystal device.

Explanation of symbols

1 .... Liquid crystal panel, 3 .... Point light source, 6 .... Light guide plate, 7 .... Flexible substrate, 8 .... Lighting device, 9 .... Frame, 23..Scatter plate, 24..Prism sheet, 25 .. · Prism sheet (optical sheet), 25f · · Outer edge of prism sheet, 28 · · Double-sided tape, 4
1 .... Upper polarizing plate, 42 ... Lower polarizing plate, 91 ... Resin frame, 92 ... Metal frame, 1
00 .... Liquid crystal device, 911..Step part of resin frame

Claims (9)

LCD panel,
A lower polarizing plate disposed on the back surface of the liquid crystal panel;
A frame in which the liquid crystal panel and the lower polarizing plate are accommodated inside, and a stepped portion that supports a back side edge of the liquid crystal panel extends along an outer edge of the liquid crystal panel;
A double-sided tape having a lower surface bonded to the upper surface of the stepped portion and an upper surface bonded to the liquid crystal panel;
An optical sheet that is disposed inside the frame so as to overlap the lower surface of the lower polarizing plate, and at any one of the two locations where the outer peripheral ends face each other, is in a non-contact state with respect to the double-sided tape. When,
A liquid crystal device comprising: The optical sheet is rectangular,
2. The two sides facing each other at the outer peripheral edge of the optical sheet, wherein at least one of the two sides facing each other is not in contact with the double-sided tape. The liquid crystal device described. The liquid crystal device according to claim 1, wherein the optical sheet is a prism sheet. 4. The liquid crystal device according to claim 1, wherein the entire outer peripheral edge of the optical sheet is in a non-contact state with respect to the double-sided tape. Where the optical sheet is in a non-contact state with respect to the double-sided tape, the inner edge of the double-sided tape overlaps with the inner edge of the stepped portion or is located outside the inner edge of the stepped portion. The liquid crystal device according to claim 1, wherein the liquid crystal device is a liquid crystal device. The lower polarizing plate is disposed at least inside the stepped portion,
The optical sheet is disposed at a position lower than the upper surface of the stepped portion,
6. The liquid crystal device according to claim 1, wherein an upper surface of the double-sided tape is directly bonded to a rear surface side end portion of the liquid crystal panel. The step portion includes a protrusion protruding inward from the upper end portion,
The liquid crystal device according to claim 1, wherein an outer peripheral end portion of the optical sheet is in contact with a lower surface of the protrusion. The portion of the outer peripheral edge of the optical sheet facing the portion in contact with the double-sided tape is in a non-contact state with respect to the double-sided tape. The liquid crystal device according to any one of the above. An electronic apparatus comprising the liquid crystal device according to claim 1.

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