JP5271653B2 - Liquid crystal device and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device having a liquid crystal panel and a frame to be securely fixed by a double-sided tape and reducing the thickness and cost, 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 an optical sheet 40 such as a lower polarizing plate 42 is disposed at a position lower than the step part 911 in the frame 9. An outer circumferential edge 28e of the double-sided tape 28 overlaps an outer circumferential edge 1e of the liquid crystal panel 1. The double-sided tape 28 includes a protruding portion 281 protruding from the step part 911 toward the inside of the frame 9. A front surface of the protruding portion 281 is bonded to a rear surface of the liquid crystal panel 1, and a rear surface of the protruding portion 281 is bonded to an end part on the front surface side of the lower polarizing plate 42. <P>COPYRIGHT: (C)2010,JPO&amp;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.

As shown in FIG. 7, the transmissive or transflective liquid crystal device has a reflective sheet 27, a light guide plate 6 for backlight, a plurality of optical sheets 40, and a liquid crystal panel 1 inside a frame 9X.
The upper polarizing plate 41 has a structure in which the upper polarizing plate 41 is sequentially stacked. In the plurality of optical sheets 40, the lower polarizing plate 42 is positioned closest to the liquid crystal panel. The frame 9X is a metal frame 9
2X and a resin frame 91X, and a step portion 9 is provided on the inner periphery of the resin frame 91X.
11 is formed. Therefore, the liquid crystal panel 1 can be supported by the step portion 911 of the resin frame 91X. Further, among the optical sheet 40 on the back side, the lower polarizing plate 42 located closest to the liquid crystal panel 1 side is adhered to the back side of the liquid crystal panel 1 by the adhesive layer 51, and
If the double-sided tape 28 is disposed between the back surface side of the lower polarizing plate 42 and the step 911, the double-sided tape 2
The liquid crystal panel 1 can be fixed to the stepped portion 911 of the frame 9X through the 8 and the lower polarizing plate 42. Here, the lower polarizing plate 42 is smaller in size than the liquid crystal panel 1, and the outer peripheral edge of the lower polarizing plate 42 is located inside the outer peripheral edge of the liquid crystal panel 1.

Such a liquid crystal device 100X has a structure in which the liquid crystal panel 1 is fixed to the frame 9X via the lower polarizing plate 42 by the double-sided tape 28, but a flexible substrate (not shown) connected to the liquid crystal panel 1 The liquid crystal panel 1 may be peeled off from the step portion 911 of the frame 9X or may be lifted from the step portion 911 due to a reaction force when the frame is bent, vibration during transportation, a change in humidity, or the like. . Such inconvenience lowers display quality and is not preferable. For this reason, it is often the case that an upper metal frame (not shown) is covered on the upper surface of the frame 9X and the liquid crystal panel 1 is sandwiched between the upper metal frame and the frame 9X.

Further, for the purpose of preventing the liquid crystal panel 1 from peeling off or floating from the frame 9X, heat such as polyolefin or fluororesin is applied to the surface of the liquid crystal panel 1 from the end exposed from the upper polarizing plate 41 and the upper end of the frame 9X. The structure which provided the contractive fixing member is proposed (refer patent document 1).
JP 2007-219428 A

However, since the liquid crystal panel 1 is required to be thin, small, and low in cost,
Although it is desired to omit the upper metal frame that sandwiches the liquid crystal panel 1 with the frame 9X, if the upper metal frame is omitted, the liquid crystal panel 1 cannot be prevented from being peeled off or lifted from the frame 9X. In particular,
When the liquid crystal panel 1 is downsized or the frame is narrowed, the non-display area and the lower polarizing plate 42 are small. Therefore, the width dimension W11 of the bonding region between the lower polarizing plate 42 and the double-sided tape 28 is narrowed. Yes. For this reason, when the liquid crystal panel 1 is downsized, the fixing strength of the liquid crystal panel 1 by the double-sided tape 28 is reduced, and therefore it is increasingly difficult to omit the upper metal frame.

On the other hand, a configuration in which a heat-shrinkable fixing member as proposed in Japanese Patent Application Laid-Open No. 2007-219428 is added alone causes an increase in cost, and the upper surface of the frame 9X and the surface of the liquid crystal panel 1 There is a design restriction that it is necessary to match the height position. For this reason, it is difficult to employ a configuration in which a heat-shrinkable fixing member is added.

Furthermore, in order to reduce the thickness of the liquid crystal panel 1, there is a demand for omitting portions that do not directly contribute to image display or the like. For example, since the adhesive layer 51 that bonds the lower polarizing plate 42 and the liquid crystal panel 1 occupies a thickness of about 10 μm, the adhesive layer 51 is preferably omitted, but the adhesive layer 51 is omitted. The liquid crystal panel 1 cannot be fixed to the step portion 911 of the frame 9X via the double-sided tape 28 and the lower polarizing plate 42.

In view of the above-described problems, an object of the present invention is to provide a liquid crystal device and a liquid crystal device that can securely fix a liquid crystal panel and a frame with a double-sided tape, and can be reduced in thickness and cost. The object is to provide an electronic device equipped.

In order to solve the above-described problems, a liquid crystal device according to the present invention includes a liquid crystal panel, a frame in which a step portion supporting the outer peripheral edge on the back side of the liquid crystal panel is formed on the inner periphery, and the step portion in the frame. One or more optical sheets disposed on the back side of the liquid crystal panel on the inner side, disposed between the stepped portion and the liquid crystal panel, and a side opposite to the liquid crystal panel is a reflective surface, a side of the liquid crystal panel and the double-sided tape that have a projecting portion projecting toward the inside of the frame from the stepped portion width dimension a larger than the stepped portions have become light-absorbing surface, the said The entire surface of the double-sided tape is adhered to the rear edge of the liquid crystal panel so that the outer peripheral edge overlaps the outer peripheral edge of the liquid crystal panel or the outer peripheral edge of the liquid crystal panel. Front side is front Together and is bonded to the stepped portion, the one rear face of the overhanging portion of the one or a plurality of optical sheets are adhered to the surface side end portion of the optical sheet positioned closest to the liquid crystal panel side, wherein the one or plurality in the optical sheet, a lower polarizing plate is an optical sheet positioned closest to the liquid crystal panel side, transparent filler is filled between the liquid crystal panel and the lower polarizing plate. In the present invention, “adhesion” means “adhesion”.

In the liquid crystal device according to the present invention, the liquid crystal panel and the step portion of the frame are directly bonded by a double-sided tape, and are not configured to be bonded via a lower polarizing plate . For this reason, even if the size of the optical sheet such as the lower polarizing plate is reduced along with the downsizing and narrowing of the liquid crystal panel, the region where the liquid crystal panel and the double-sided tape are bonded is not narrowed. Therefore, even if the liquid crystal panel is downsized, the liquid crystal panel can be securely fixed to the frame, so that the liquid crystal panel can be prevented from peeling off or floating. Accordingly, since the liquid crystal panel does not have to be held between the upper metal frame and the frame, the upper metal frame can be omitted, and the cost can be reduced. Further, the stepped portion of the liquid crystal panel and the frame are bonded directly by a double-sided tape, not in the adhesive to each other via the optical sheet such as the lower polarizing plate. For this reason, it is not necessary to fix a liquid crystal panel and a lower polarizing plate with an adhesive layer. Therefore, the number of manufacturing steps can be reduced, and the cost can be reduced. In addition, since the adhesive layer that fixes the liquid crystal panel and the lower polarizing plate can be omitted, the liquid crystal device can be made thinner accordingly.

In the present invention, the double-sided tape includes a protruding portion that protrudes from the step toward the inside of the frame, the surface of the protruding portion is adhered to the back surface of the liquid crystal panel, and the back surface of the protruding portion is Of the one or more optical sheets, it is bonded to the surface side end portion of the optical sheet located closest to the liquid crystal panel. This configuration can be done by projecting portions of the double-sided tape, a liquid crystal panel, the fixing of the lower polarizing plate. The double-sided tape has a reflective surface on the side opposite to the liquid crystal panel side and a light absorbing surface on the liquid crystal panel side. If comprised in this way, it can prevent that the light from a backlight apparatus is reflected by the reflective surface, leaks, and is radiate | emitted.

In the present invention, the outer peripheral edge of the double-sided tape, a position overlapping the outer peripheral edge of the liquid crystal panel, or Ru near the outside position of the outer periphery of the liquid crystal panel. By adopting such a configuration, the entire width direction of the region where the liquid crystal panel and the stepped portion overlap can be used as an adhesive region between the liquid crystal panel and the frame using the double-sided tape.

In the present invention, the optical sheet located closest to the liquid crystal panel among the one or more optical sheets is the lower polarizing plate.

In the present invention, between the liquid crystal panel and the lower polarizing plate that has a light-transmitting filler is filled. If comprised in this way, since an air layer does not intervene between a liquid crystal panel and a lower polarizing plate , generation | occurrence | production of the reflection and Newton ring in an interface can be prevented.

In the present invention, the frame includes a bottom portion that supports the one or more optical sheets on the back surface side, and a reflective sheet, a light guide plate for backlight, and the one or more optical sheets are disposed on the bottom portion. It is preferable that they are arranged one on top of the other in order. With this configuration, the reflection sheet, the backlight light guide plate, and one or more optical sheets can be sequentially dropped onto the bottom of the frame, so these members are arranged inside the frame. Work can be performed efficiently.

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 will be described with the same reference numerals so as to easily understand the correspondence with the configuration shown in FIG.

[Embodiment 1]
(Overall configuration of liquid crystal device)
1A and 1B are a plan view of a liquid crystal device according to Embodiment 1 of the present invention and a plan view in which a part thereof is enlarged. FIG. 2 is an exploded perspective view 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 a region where a group of three slanting lines on the right is attached. 1A and 1B, the outer peripheral edge of the lower polarizing plate 42 described later is indicated by a long dotted line, and the inner peripheral edge of a step portion 911 described later is indicated by a one-dot chain line.

As shown in FIGS. 1A, 2 and 3A, 3B, a liquid crystal device 100 according to the present embodiment includes a transmissive or transflective liquid crystal panel 1 and a back surface of the liquid crystal panel 1. The lighting device 8 and the liquid crystal panel 1 are held inside a frame 9 having a planar 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. 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. In addition, the frame 9 can be configured integrally with the resin frame 91 and the metal frame 92 by insert molding or outsert molding of the metal frame 92. In this embodiment, the frame 9 is made of an insert molded product of a resin frame 91 made of polycarbonate resin or the like and a metal frame 92.

The resin frame 91 has a notch 914 formed in one side plate portion 917a located on the drawer side of the flexible substrate 7 among the four side plate portions 917, and the inside of the remaining three side plate portions 917 (inner circumference of the frame 9). Further, a step portion 911 for receiving the liquid crystal panel 1 on the upper surface is formed. In this embodiment, the stepped portion 911 is formed continuously on the inner periphery of the three side plate portions 917 excluding the side plate portion 917a located on the drawing side of the flexible substrate 7 among the four side plate portions 917. In the resin frame 91, the vicinity of the side plate portion 917 located on the pull-out side of the flexible substrate 7 is an interrupted portion 915 of the step portion 911, and the step portion 911 is not formed.

The metal frame 92 includes a rectangular bottom plate portion 925 (bottom portion) and four side plate portions 927 that stand on the outer edge of the bottom plate portion 925, and one side plate portion 927 a located on the drawer side of the flexible substrate 7 is The height dimension is lower than that of the side plate portion 927 located on the other side.
A rectangular opening 925 a is formed in the bottom plate portion 925 of the metal frame 92. Also,
The side plate portion 927 of the metal frame 92 has a structure in which the tip end portion is folded back except for one side plate portion 927a located on the drawer side of the flexible substrate 7.

The liquid crystal panel 1 includes an element substrate 11, a counter substrate 12 disposed to face the first surface 11 a (one surface) of the element substrate 11, and a rectangular frame that bonds the element substrate 11 and the counter substrate 12 at the peripheral edge of the substrate. And the element substrate 11, the counter substrate 12, and the seal material 1.
The liquid crystal layer 14 held in the space formed by 3 is held. The element substrate 11 is
An overhanging region 18 protruding from the end of the counter substrate 12 is provided. 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 horizontal direction is adopted, and 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 pixel electrode 16 and the common electrode 17 are schematically shown so as to face each other in the horizontal direction as in the IPS method in the FFS method. A color filter (not shown) is provided on the first surface 12a of the counter substrate 12.
May be formed. In the liquid crystal device 100 of the present embodiment, the liquid crystal panel 1 is TN.
(Twisted Nematic) type, ECB (Electrically Controlled Birefringence) type, or VAN (Vertical Aligned Nematic) type liquid crystal panel may be configured. In this case, the pixel electrode 16 is formed on the element substrate 11, and the counter substrate 12. 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 opposite side to a, and the element substrate 11 has a lower surface on the second surface 11b opposite to the first surface 11a facing the opposing substrate 12. A plurality of optical sheets 40 including the polarizing plate 42 are disposed so as to overlap each other.

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 FIG. 1A, FIG. 2 and FIG. 3A, a driving IC 98 is mounted on the projecting region 18 of the element substrate 11 with an anisotropic conductive film or the like.
The flexible substrate 7 is connected to the end of the. 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 unit 71, and a light source driving voltage is supplied to the point light source 3 through the flexible substrate 7. On the surface of the flexible substrate 7 on which the point light source 3 is mounted, an electronic component 35 such as a surface mount type capacitor is provided.
Has also been implemented. 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. For this reason, the 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. Moreover, the illuminating device 8 is the back surface 6 on the opposite side to the light emission surface 6a in the light-guide plate 6. FIG.
A reflection sheet 27 is provided so as to overlap with b. Further, the lighting device 8 includes a rectangular scattering plate 23, a rectangular prism sheet 24, and a rectangular prism sheet 25 as the optical sheet 40 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. The scattering plate 23 is for making the luminance of light in the display screen more uniform. The prism sheets 24 and 25 are for adjusting the orientation angle of the emitted light and improving the front luminance.

A light source arrangement hole 61 having a notch shape is formed at a predetermined interval along the side of the end portion 6e of the light guide plate 6. Light emitted from the point light source 3 is incident on one of the inner walls thereof. Light incident part 6
It is 1a. Therefore, in the flexible substrate 7, the point light source 3 of the light source mounting portion 71.
When the band-like portion 72 is bent so that the surface on which the light source is mounted faces downward and the light source mounting portion 71 is overlaid on the end portion 6e of the light guide plate 6, each of the plurality of point light sources 3 has a light emitting surface 3a. Is arranged in the light source arrangement hole 61 with the light incident portion 61a facing the light incident portion 61a. For the purpose of maintaining such a state, a light shielding sheet 29 having an adhesive layer formed on the lower surface is attached along the end 6e 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. Therefore, when the light source mounting portion 71 of the flexible substrate 7 is overlapped on the light shielding sheet 29, the plurality of point light sources 3 are respectively arranged in the light source arrangement holes 61 through the openings 291.

(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 | disconnected in the position corresponded to 1 'line, and its expanded sectional view.

In the liquid crystal device 100 of the present embodiment, when the liquid crystal panel 1 is fixed to the inside of the frame 9, FIGS. 1 (a), 1 (b), 2, 3 (a), (b) and 5 (a), As shown in (b), the liquid crystal panel 1 is formed by a step portion 911 formed on the side plate portion 917 of the resin frame 91.
The double-sided tape 28 is supported between the step 911 and the liquid crystal panel 1.
Place.

Such a double-sided tape 28 includes an adhesive layer on both sides of a film substrate. For this reason, the front side of the double-sided tape 28 is adhered to the liquid crystal panel 1, and the back side is the step 9 of the frame 9.
Adhere to 11. Therefore, in this embodiment, the lower polarizing plate 42 is formed to have a size that enters the inside of the inner peripheral edge of the step portion 911. The lower polarizing plate 42 includes the reflective sheet 27, the light guide plate 6, the scattering plate 23, and the prism sheet. Similar to 24 and 25, the liquid crystal panel 1 is disposed so as to overlap the back side of the liquid crystal panel 1 inside the step portion 911. In this state, the surface of the lower polarizing plate 42 is at a height position substantially equal to the step portion 911. For this reason, a gap 19 corresponding to the thickness of the double-sided tape 28 is formed between the liquid crystal panel 1 and the lower polarizing plate 42, and the gap 19 is an air layer.

In this embodiment, the double-sided tape 28 is a light shielding tape having a thickness of 50 to 60 μm. The double-sided tape 28 has a white or silver reflecting surface on the lower surface side, and a black light absorbing surface on the upper surface side.

As shown in FIGS. 5A and 5B, the liquid crystal panel 1 includes a side plate portion 917 of the resin frame 91.
The size is slightly smaller than the area surrounded by, and the gap S1 is disposed between the outer peripheral edge 1e of the liquid crystal panel 1 and the inner peripheral surface of the side plate portion 917 of the resin frame 91. Also,
The outer peripheral edge 28e of the double-sided tape 28 is in a position overlapping the outer peripheral edge 1e of the liquid crystal panel 1. For this reason, the outer peripheral edge 1 e of the double-sided tape 28 is separated from the inner peripheral surface of the side plate portion 917 of the resin frame 91 by a gap S 1 as in the liquid crystal panel 1.

Here, the double-sided tape 28 has a width dimension larger than that of the step portion 911, and the double-sided tape 28 includes a protruding portion 281 that protrudes from the step portion 911 toward the inside of the frame 9. The surface side of the overhanging portion 281 of the double-sided tape 28 is bonded to the back surface of the liquid crystal panel 1, and the back surface of the overhanging portion 281 is bonded to the surface side end portion of the lower polarizing plate 42.

Therefore, the double-sided tape 28 is bonded to the step portion 911 with the width dimension W1, is bonded to the liquid crystal panel 1 with the width dimension W2, and is bonded to the lower polarizing plate 42 with the width dimension W3.

When the liquid crystal device 100 is mounted on an electronic device to be described later, as shown in FIG. 5A, the liquid crystal device 100 is covered with a frame-shaped frame 2 having a window-shaped opening 21. Therefore, an area corresponding to the opening 21 is an image display area 22 through which the display light emitted from the liquid crystal panel 1 passes. Therefore, in this embodiment, the inner peripheral edge 28f of the double-sided tape 28 is positioned outside the inner peripheral edge of the opening 21 (the outer peripheral edge of the image display region 22), and the inner peripheral edge 28f of the double-sided tape 28 and the opening 21 A margin S5 of about 0.5 mm in a plan view is secured between the inner periphery (the outer periphery of the image display area 22).

Note that the cross-sectional configuration described with reference to FIG.
The cross-sectional configuration when cut along line 1 ′ and the cross-sectional configuration when cut along line G1-G1 ′ of FIG. Therefore, the cross-sectional configuration when the liquid crystal device 100 is cut along the line F1-F1 'in FIG. 1A and the cross-sectional configuration when cut along the line G1-G1' in FIG. Omitted.

(Assembly method of liquid crystal device 100)
In order to assemble the liquid crystal device 100 of the present embodiment, first, as shown in FIG.
1, the reflective sheet 27, the light guide plate 6, and the optical sheet 40 (the scattering plate 23, the prism sheets 24 and 25, and the lower polarizing plate 42) are sequentially stacked on the bottom plate portion 925, and then the end of the light guide plate 6. The light shielding sheet 29 is stacked so as to cover the portion 6e. For the light shielding sheet 29,
You may employ | adopt the structure which adhere | attached itself to the edge part 6e of the light-guide plate 6 as a double-sided tape. Next, in the flexible substrate 7, the band-like 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 point light source 3 is attached to the end 6 e of the light guide plate 6. Deploy. At that time, the light source mounting portion 71 is pressed against the light shielding sheet 29 and fixed. As a result, the lighting device 8 is completed.

On the other hand, an upper polarizing plate 41 is bonded to the surface of the liquid crystal panel 1. And Fig.1 (a), (
b) As shown in FIGS. 3, 5A and 5B, the outer peripheral edge 1 with respect to the back side of the liquid crystal panel 1
After the double-sided tape 28 is applied along e, 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. Then, the liquid crystal panel 1 is pressed against the step portion 911 and the double-sided tape 28 is bonded to the step portion 911. At that time, double-sided tape 2
The eight protruding portions 281 are bonded to the upper surface of the lower polarizing plate 42.

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 such a method is adopted, when the liquid crystal panel 1 is pressed against the step portion 911, the double-sided tape 28 can be adhered to the liquid crystal panel 1, and the protruding portion 281 of the double-sided tape 28 is attached to the upper surface of the lower polarizing plate 42. Glued.

(Main effects of this form)
As described above, in the liquid crystal device 100 of the present embodiment, the liquid crystal panel 1 and the step portion 911 of the frame 9 are directly bonded by the double-sided tape 28 and are bonded via the optical sheet 40 such as the lower polarizing plate 42. Not configured. For this reason, even when the size of the non-display area and the lower polarizing plate 42 is reduced due to the downsizing and narrow frame of the liquid crystal panel 1, the area where the liquid crystal panel 1 and the double-sided tape 28 are bonded is not narrowed. .

That is, when the liquid crystal panel 1 is bonded to the step portion 911 of the frame 9 with the double-sided tape 28,
When the configuration described with reference to FIG. 7 is adopted, it can only be bonded with a width dimension W11 corresponding to the overlapping width of the step portion 911 and the lower polarizing plate 42, but according to this embodiment, as shown in FIG. The liquid crystal panel 1 has a width dimension W1 corresponding to the overlapping width of the step portion 911 and the liquid crystal panel 1.
And the step portion 911 of the frame 9 can be bonded by the double-sided tape 28. Therefore, according to this embodiment, compared with the configuration described with reference to FIG. 7, the liquid crystal panel 1 is bonded to the step portion 911 of the frame 9 with the double-sided tape 28 so as to correspond to the width dimension W12. can do.

In addition, since the outer peripheral edge 28e of the double-sided tape 28 is positioned so as to overlap with the outer peripheral edge 1e of the liquid crystal panel 1, the entire width direction of the region where the liquid crystal panel 1 and the step 911 are overlapped is liquid crystal. It can be used as an adhesion region between the panel 1 and the step portion 911 of the frame 9.

Therefore, according to the present embodiment, the liquid crystal panel 1 can be securely fixed to the frame 9 even if the liquid crystal panel 1 is downsized. Therefore, the reaction force and the vibration during transportation caused by bending the flexible substrate 7. Even when stress such as stress due to humidity change is applied to the liquid crystal panel 1, there is a problem that the liquid crystal panel 1 is peeled off from the step portion 911 of the frame 9X, or the liquid crystal panel 1 is stepped 91.
The problem of floating from 1 does not occur. Accordingly, 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, and the cost can be reduced.

Further, since the liquid crystal panel 1 and the step portion 911 of the frame 9 are directly bonded by the double-sided tape 28, it is not necessary to fix the liquid crystal panel 1 and the lower polarizing plate 42 with an adhesive layer. For this reason, since the number of manufacturing steps can be reduced, cost reduction can be achieved. In addition, since the adhesive layer for fixing the liquid crystal panel 1 and the lower polarizing plate 42 can be omitted, the liquid crystal device 1 correspondingly.
00 can be reduced in thickness.

The double-sided tape 28 includes an overhanging portion 281 that protrudes from the step portion 911 toward the inside of the frame 9, and the surface of the overhanging portion 281 is adhered to the back surface of the liquid crystal panel 1. Of the optical sheet 40, it is bonded to the surface side end of the lower polarizing plate 42 located on the liquid crystal panel 1 side. For this reason, the protruding portion 2 of the double-sided tape 28
By 81, the liquid crystal panel 1 and the lower polarizing plate 42 can be fixed.

Further, the frame 9 has a bottom plate portion 925 (bottom portion) that supports the optical sheet 40 and the like on the back surface side.
It has. For this reason, since the reflection sheet 27, the light guide plate 6 for backlight, and the optical sheet 40 can be sequentially dropped onto the bottom plate portion 925, the work of arranging these members inside the frame is efficiently performed. Can be done.

Furthermore, since the double-sided tape 28 is a light-shielding double-sided tape, light from the illumination device 8 (backlight device) enters the liquid crystal panel 1 without passing through the optical sheet 40, or light from the illumination device 8. Can be prevented from leaking without passing through the optical sheet 40 or the liquid crystal panel 1.

[Embodiment 2]
In the first embodiment, an air layer (gap 19) corresponding to the thickness of the double-sided tape 28 is formed between the liquid crystal panel 1 and the lower polarizing plate 42. A light-transmitting filler, for example, a filler such as an acrylic resin is filled. According to such a configuration, since no air layer is interposed between the liquid crystal panel 1 and the lower polarizing plate 42, it is possible to prevent reflection at the interface and generation of Newton rings.

[Embodiment 3]
In the first embodiment, the step portion 911 in the frame 9 is configured to continuously extend over the three side plate portions 917 of the four side plate portions 917.
The present invention may be applied to a case in which 11 is configured to be separated. For example, the step 91
The present invention may be applied to the case where 1 is formed only in the middle part in the length direction of the side plate part 917 or only in the corner part.

[Other embodiments]
In Embodiment 1, the outer peripheral edge 28e of the double-sided tape 28 and the outer peripheral edge 1e of the liquid crystal panel 1 overlap each other. However, the outer peripheral edge 28e of the double-sided tape 28 is positioned outside the outer peripheral edge 1e of the liquid crystal panel 1. May be adopted.

Further, in the first embodiment, among the optical sheets 40 arranged on the back side of the liquid crystal panel 1, the optical sheet arranged closest to the liquid crystal panel 1 is the lower polarizing plate 42. The present invention may be applied to a liquid crystal device that does not use a polarizing plate, such as liquid crystal (PDLC / Polymer Dispersed Liquid Crystals).

[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. 6A shows a 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. 6B 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. 6C shows a 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.

Electronic devices to which the liquid crystal device 100 is applied include, in addition to those shown in FIG. 6, 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, and 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.

(A), (b) is the top view of the liquid crystal device which concerns on Embodiment 1 of this invention, respectively, and the top view which expanded the part. 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 of 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 which concerns on Embodiment 1 of this invention is cut | disconnected in the position corresponded to the E1-E1 'line of FIG. 1, respectively, and its expanded sectional view. . 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 (optical sheet), 24, 25. · Prism sheet (optical sheet), 28 · · Double-sided tape, 41 · · Upper polarizing plate, 42 · · Lower polarizing plate (optical sheet), 91 · · Resin frame, 92 · · Metal frame, 100 · · Liquid crystal device, 281,
・ A projecting part of the double-sided tape, 911 ..Step portion of the resin frame, 917 ..Side plate portion of the resin frame, 927 ..Side plate portion of the metal frame,

Claims (3)

LCD panel,
A frame in which a step portion supporting the outer peripheral edge on the back side of the liquid crystal panel is formed on the inner periphery;
One or more optical sheets disposed on the back side of the liquid crystal panel inside the step in the frame; and
It is arranged between the step and the liquid crystal panel, the side opposite to the liquid crystal panel is a reflecting surface, the liquid crystal panel side is a light absorbing surface, and the width dimension is larger than the step. has a double-sided tape from the stepped portion that provides an overhang portion projecting inwardly of said frame, and
The entire surface of the double-sided tape is adhered to the rear edge of the liquid crystal panel so that the outer peripheral edge overlaps the outer peripheral edge of the liquid crystal panel or the outer peripheral edge of the liquid crystal panel. And the back surface of the projecting portion is bonded to the surface side edge of the optical sheet located closest to the liquid crystal panel among the one or more optical sheets,
Of the one or more optical sheets, the optical sheet located closest to the liquid crystal panel is a lower polarizing plate,
A liquid crystal device in which a light-transmitting filler is filled between the liquid crystal panel and the lower polarizing plate.   The frame includes a bottom portion that supports the one or more optical sheets on the back surface side,
  The liquid crystal device according to claim 1, wherein a reflection sheet, a backlight light guide plate, and the one or more optical sheets are sequentially stacked on the bottom portion. An electronic apparatus comprising the liquid crystal device according to claim 1.

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