JPH11184400A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the image of a liquid crystal display panel longitudinally and laterally. SOLUTION: The incidence surface 32 of a 1st photoconductor 27 formed by closely gathering many optical divers 28 is provided on the top surface side of a liquid crystal display panel 21 which is arranged horizontally. On he side of the light-emitting surface 33 of the 1st photoconductor 27, the incidence surface 38 of a 2nd photoconductor 34 formed by closely gathering many optical fibers 35 is provided. On the side of the light-emitting surface 39 of the 2nd photoconductor 34, 1st and 2nd refraction bodies 40 and 41 and a screen 42 are provided. Then an image of the liquid crystal display panel 21 is enlarge double in the lateral (X) direction by the 1st photoconductor 27 and the image of the liquid crystal display panel 21 is enlarged double on the longitudinal (Y) direction as well by the 2nd photoconductor 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a liquid crystal display device, and more particularly to a display device capable of enlarging an image.

[0002]

2. Description of the Related Art Some display devices have a light guide for enlarging an image provided between a display such as a liquid crystal display panel and a screen. FIG. 12 is a partially cutaway perspective view of an example of such a conventional display device (see Japanese Patent Application No. 8-95879). This display device includes a liquid crystal display panel 1 that is appropriately inclined. The liquid crystal display panel 1 basically has a structure in which liquid crystal (not shown) is sealed between a pair of substrates 2 and 3. A backlight unit 4 is provided on the lower surface side of the liquid crystal display panel 1. The backlight unit 4 has a structure including a surface light source-forming light guide plate 5, a fluorescent tube 6, and the like. On the upper surface side of the display area of the liquid crystal display panel 1, there is provided a light guide 8 formed by a large number of optical fibers 7 into a right-angled triangular shape. The lower surface of the light guide 8 is an incident surface 9, and the slope is an emission surface 10 inclined at a predetermined angle with respect to the incident surface 9. A refractor 11 and a screen 12 are provided on the exit surface 10 side of the light guide 8.

In this display device, when light is emitted from the upper surface of the light guide plate 5 for forming a surface light source of the backlight unit 4,
Image light corresponding to the display drive of the liquid crystal display panel 1 is emitted from the upper surface of the display area of the liquid crystal display panel 1 and is incident on the incident surface 9 of the light guide 8. The incident image light is emitted from the emission surface 10 of the light guide 8, is then refracted by the refractor 11 in a predetermined direction, and is displayed on the screen 12. In this case, the image light emitted from the upper surface of the display area of the liquid crystal display panel 1 is expanded in one predetermined direction (vertical direction) according to the side shape of the light guide 8.

[0004]

However, in such a conventional display device, the image of the liquid crystal display panel 1 is enlarged only in one predetermined direction (vertical direction) in accordance with the side shape of the light guide 8. Therefore, if the structure of the liquid crystal display panel 1 is the same as that of a normal one (that is, one that normally displays one image by itself), the image cannot be enlarged in the horizontal direction, and There is a problem that the image becomes wide. In addition, there is a method in which the image is enlarged in the horizontal direction by the liquid crystal display panel 1 itself, but in this case, the structure of the liquid crystal display panel 1 is different from a normal one and is special. An object of the present invention is to make it possible to enlarge an image of a display body in a vertical direction and a horizontal direction.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a lateral length of an exit surface is set between a display and a light guide for enlarging an image of the display in the vertical direction. A light guide larger than the length is interposed, and the image of the display is enlarged in the horizontal direction by the interposed light guide.
Therefore, according to the present invention, the image of the display can be enlarged in the vertical and horizontal directions.

[0006]

FIG. 1 is a perspective view of a display device according to a first embodiment of the present invention, in which a main part of the display device is partially cut away. This display device includes a liquid crystal display panel 21 arranged horizontally. The liquid crystal display panel 21
Basically, it has a structure in which a liquid crystal (not shown) is sealed between a pair of substrates 22 and 23. Liquid crystal display panel 2
A backlight unit 24 is provided on the lower surface side of 1. The backlight unit 24 has a structure including a light guide plate 25 for forming a surface light source, a fluorescent tube 26 and the like. A first light guide 27 is provided on the upper surface side of the display area of the liquid crystal display panel 21.
Is provided. The first light guide 27 includes a lower front inverted trapezoidal portion 29 and an upper flat plate portion 30 which are continuously formed by a number of optical fibers 28. The lower surface of the front inverted trapezoidal portion 29 is an incident surface 32, and the upper surface of the flat plate portion 30 is an output surface 33 parallel to the incident surface 32. The first light guide 27 has a length in the horizontal (X) direction at the end of the optical fiber 28 on the side of the exit surface 33 that is longer than the length of the end of the optical fiber 28 on the side of the entrance surface 32, so that each of the optical fibers 28 emits light. The lateral length of the surface 32 is formed to be larger than the lateral length of the emission surface 33, and the forming method will be described later. A second light guide 34 is provided on the emission surface 33 side of the first light guide 27. Second light guide 3
4 is a lower flat plate portion 36 and an upper side right triangular portion 37 continuously formed by a number of optical fibers 35.
And The lower surface of the flat portion 36 is an incident surface 38, and the slope of the right-angled triangular portion 37 is the incident surface 38.
The light exit surface 39 is inclined at a predetermined angle with respect to. The inclined surface 39 is provided on the light exit surface 33 of the first light guide 27.
The image enlarged in the horizontal (X) direction by the first light guide 27 is enlarged in the Y direction along the inclined surface 39. The method for forming the second light guide 34 will also be described later. The entrance surface 38 of the second light guide 34 is the exit surface 3 of the first light guide 27.
3 is bonded via an adhesive made of an acrylic resin (not shown). Each of the optical fibers 28 constituting the flat plate portion 30 of the first light guide 27 is connected to the incident surface 3 of the second light guide 34.
8, each optical fiber 35 constituting the second light guide 34 is also perpendicular to the incident surface 38 of the second light guide 34. Therefore, each optical fiber 28 of the plate-shaped portion 30 of the first light guide 27 and each optical fiber 3 of the second light guide 34
5 is parallel. Emission surface 3 of second light guide 34
A first refractor 40, a second refractor 41, and a screen 42 are provided on the 9th side. Although not shown in detail, the screen 42 is formed of a diffusion plate formed by closely contacting a large number of extremely small lens portions on the entire one surface of the resin sheet. The first refractor 40 and the second refractor 41 will be described later.

The liquid crystal display panel 21 is an active matrix type liquid crystal display panel provided with a thin film transistor as a switching element, and has the same structure as a normal one. That is, the lower substrate 23 of the liquid crystal display panel 21 on which the thin film transistors and the like are provided has a structure as shown in an equivalent circuit in FIG. A large number of scanning lines 51 and selection lines 52 are arranged in a matrix on the upper surface side of the lower substrate 23, and a pixel electrode 53 is connected to both lines 51 and 52 via a thin film transistor 54 near each intersection. It is arranged. in this case,
A connection terminal 55 for the scanning line 51 is provided on the left side of the upper surface of the lower substrate 23, and a connection terminal 56 for the selection line 52 is provided on the lower side of the upper surface of the lower substrate 23. I have. The display area of the liquid crystal display panel 21 (the inner area surrounded by the outermost pixel electrode 53) is a normal TV.
As in the image display device, the ratio of the length to width is approximately 3: 4 or approximately 9:16, and the number of scanning lines 51 and selection lines 52 corresponding to this ratio is formed at a predetermined pitch. ing. As an example, the scanning line 51 and the selection line 52 are 48
0x640 lines provided, 600 in case of SVGA regulation
× 800 are provided, but in the present invention, the number of each line is not limited to this,
In short, what is necessary is just to have the number displayed as a normal image.

Next, the second light guide 34 and the first refractor 4
The zero and second refractors 41 will be described with reference to FIG. The second light guide 34 is formed by densely arranging a large number of optical fibers 35 each having a core 61 made of an acrylic resin having a high refractive index covered with a clad 62 made of a fluororesin having a low refractive index. . In this case, the second light guide 34
The angle θ between the entrance surface 38 and the exit surface 39 is about 60 °. Therefore, the length of the exit surface 39 is twice as long as the length of the incident surface 38 on the side surface of the second light guide 34. A first refractor 40 is adhered to the emission surface 39 of the second light guide 34. The first refractor 40 is made of the same material or the same core 61 as the core 61 of the second light guide 34.
This sheet is made of a material having a refractive index similar to the following, and has a number of exit surfaces 63 perpendicular to the long axis of each optical fiber 35 and a number of prism portions 64 having surfaces perpendicular to the exit surface 63. The prism portion 64 is formed in a linear shape or a dot shape arranged in a matrix shape perpendicular to the paper surface, and is made of the same material as the core 61 of the second light guide 34 or a material having a refractive index similar to the core 61. Prism section 6
4 is the optical fiber 35 of the second light guide 34
Is bonded to the inclined surface 39 of the second light guide 34 so as to be perpendicular to the optical axis (long axis). The function of the first refractor 40 is that the light guided by the optical fiber 34 and traveling
The core 6 is totally reflected by the inclined exit surface 39 of the light guide 34 of FIG.
1 is prevented from returning to the inside, and is made to enter the first refractor 40. On the exit surface 63 side of the first refractor 40, the second refractor 41 is arranged in close contact. Second
Is formed of the same material as the core 61 of the second light guide 34 or a material having a refractive index similar to that of the core 61, and is formed in a large number of lines or dots on the incident surface side. Is a sheet having prism portions 65 arranged in a matrix. The exit surface 66 of the second refractor 41 is a plane parallel to the exit surface 39 of the second light guide 34. Each prism section 65 has an incident surface 67 and a reflection (refraction) surface 68.
Are arranged so as to face the respective exit surfaces 63 of the prism portion 64 of the first refractor 40, and the exit surface 66 is parallel to the exit surface 39 of the second light guide 34 in this state. Light that travels along the optical fiber 35 of the second light guide 34 and the first refractor 40 and is emitted from the exit surface 63 of the first refractor 40 is transmitted from the entrance surface 67 of the second refractor 41. The light enters, is totally reflected by the reflection surface 68, and is emitted in a direction substantially perpendicular to the emission surface 66.

Next, an example of a method of forming the first light guide 27 and the second light guide 34 will be described. In the case of forming the first light guide 27, first, as shown in FIG. 4A, a rectangular parallelepiped optical fiber block 71 in which a large number of optical fibers 28 having the same diameter over the entire length are densely packed. prepare. In this case, the length of the optical fiber block 71 in the horizontal (X) direction is twice the length of the display area of the liquid crystal display panel 21 in the same direction, and the length in the vertical (Y) direction is equal to the length of the liquid crystal display panel. The length of the display area 21 in the same direction is the same, and the length in the height (Z) direction is an appropriate length.
Next, although not shown, the front surface heating member, the rear surface heating member, the lower surface heating member, the upper surface heating member, the left side heating member, and the right side heating member are brought into contact with the respective surfaces of the optical fiber block 71, and 100 to 120. Heat at a temperature of about ° C for about 30 minutes. Next, the both-side heating member and the lower-surface heating member are removed, and then, as shown in FIG. While maintaining the temperature at about ° C., the respective predetermined portions on both side surfaces of the optical fiber block 71 are equally laterally (X) in the horizontal direction by a predetermined distance (that is, the length of the optical fiber block 71 in the horizontal (X) direction). 1/4 of each)
Compress (see FIG. 4C). Then, the upper portion of the optical fiber block 71 becomes a flat portion 71a without being deformed,
The central portion is deformed into a front inverted trapezoidal portion 71b, and the lower portion is extended to become a rectangular parallelepiped portion 71c. In this case, the cross section of each of the optical fibers 28 constituting the front inverted trapezoidal portion 71b and the rectangular parallelepiped portion 71c is initially circular, but has an elliptical major axis in the Y direction. Next, when the rectangular parallelepiped part 71c is cut and removed, the first light guide 27 shown in FIG. 1 is obtained. In the first light guide 27 thus obtained,
The length of the exit surface 33 in the horizontal (X) direction is twice the length of the incident surface 32 in the same direction, and the length of the exit surface 33 in the vertical (Y) direction is the same as the length of the incident surface 32 in the same direction. It has become. On the other hand, when the second light guide 34 is formed, as shown in FIG. 5, a rectangular parallelepiped optical fiber block 74 formed by densely arranging a large number of optical fibers 35 is formed into a trapezoidal side surface along an alternate long and short dash line. When cut, two second light guides 34 are obtained.

Next, an enlarged display of an image by the display device will be described. When light is emitted from the upper surface of the light guide plate 25 for forming a surface light source of the backlight unit 24, image light corresponding to the display drive of the liquid crystal display panel 21 is emitted from the upper surface of the display area of the liquid crystal display panel 21 and the first light is emitted. Light guide 27
Is incident on the incident surface 32. This incident image light is
Optical fiber 28 of first light guide 27 and second light guide 3
After passing through the fourth optical fiber 35, the light is emitted from the emission surface 39 of the second light guide 34. In this case, the liquid crystal display panel 2
First, the image light emitted from the upper surface of the first display region has a length in the lateral direction of the emission surface 33 of the first light guide 27 that is equal to the incidence surface 3.
Since the length of the first light guide 27 is twice the length in the same direction, the first light guide 27 enlarges the width twice in the horizontal direction.
Next, when the image light enlarged twice in the horizontal direction passes through the optical fiber 35 of the second light guide 34, for example, as shown by an arrow in FIG. Each core 6
1 along the optical axis, and travels through the first refractor 40 from the exit surface 39 of the second light guide 34 to the first refractor 40.
The light exits from the exit surface 63 of each prism section 64 and enters the entrance surface 67 of the second refractor 41. The incident image light is reflected (refracted) by the reflection surface 68 of the second refractor 41, and is emitted from the output surface 66 of the second refractor 41 (that is, the second refractor 41).
The image light is substantially perpendicular to the emission surface 39) of the light guide 34 and is enlarged in the vertical direction. That is, the second
The angle θ between the entrance surface 38 and the exit surface 39 of the light guide 34
Is about 60 °, the image light enlarged twice in the horizontal direction by the first light guide 27 is also doubled in the arrangement direction of the reflection surfaces 68 of the second refractor 41, that is, in the vertical direction. It is enlarged. Then, the enlarged image light is emitted from the emission surface 66 of the second refractor 41 in a direction substantially perpendicular to the emission surface 66. The emitted image light passes through the screen 42 and is diffused by the minute lens portion of the screen 42. Then, the diffused image light is visually recognized. As described above, in this display device, even when a normal liquid crystal display panel 21 is used, the image on the liquid crystal display panel 21 can be enlarged twice in both the vertical and horizontal directions.

Here, the first and second light guides 2
The role of the flat portions 30, 36 of 7, 34 will be described. The first light guide 27 does not have the flat portions 30 and 36.
When the exit surface side of the front inverted trapezoidal portion 29 of the first light guide 27 is in contact with the incident surface side of the right side triangular portion 37 of the second light guide 34, the front inverted trapezoidal portion of the first light guide 27 is The light emitted from the emission surface side of the light-emitting device 29 travels in the direction away from each other, the viewing angle becomes extremely narrow, and a region where the liquid crystal display panel 21, for example, the left and right sides and the center image can be viewed with the same brightness is substantially formed. Will no longer exist. On the other hand, when the flat portions 30 and 36 are provided, the light emitted from the output surface side of the front inverted trapezoidal portion 29 of the first light guide 27 transmits the optical fibers of the flat portions 30 and 36. The traveling directions are changed by 28 and 35 so as to be substantially parallel light, and the viewing angle characteristics are made substantially the same. Therefore, in this display device, for example, the left and right sides and the center image of the liquid crystal display panel 21 can be viewed with the same luminance without the viewing angle becoming narrow.

In the above embodiment, the first light guide 2
7 has been described as having a structure including a lower front inverted trapezoidal portion 29 and an upper flat plate-shaped portion 30 continuously formed by a large number of optical fibers 28, but is not limited thereto. . For example, the second embodiment of the present invention shown in FIG.
As in the embodiment, the first light guide 27 may have a structure in which a flat plate portion 29 a is integrally formed on the lower surface of the front inverted trapezoidal portion 29. When the first light guide 27 is formed, for example, the first light guide 27 may be cut at an appropriate portion of the rectangular parallelepiped-shaped portion 71c shown in FIG.

In the above embodiment, for example, FIG.
As shown in (C), an optical fiber block 71 having a predetermined inclined surface 72 is used as the heating / pressing member 73.
Flat portion 71a and front inverted trapezoidal portion 71 on both side surfaces of
b and the front inverted trapezoidal portion 71b and the rectangular parallelepiped portion 71
The space between the first and the second c is formed to be a surface that is bent in a substantially U-shape, but is not limited thereto. For example, as shown in FIG. 7, as the heating / pressing member 73, a member having a predetermined inclined surface 72 a and predetermined curved surfaces 72 b and 72 c respectively continuous with upper and lower portions of the inclined surface 72 a is used. Flat portions 71a on both sides
And between the front inverted trapezoidal portion 71b and the front inverted trapezoidal portion 71b
The space between b and the rectangular parallelepiped portion 71c may be a predetermined curved surface.

In the above embodiment, the second light guide 3
4 has been described in which a large number of optical fibers 35 are densely formed. However, the present invention is not limited to this, and a thin plate-shaped light guide element having a clad or a reflective film on the front and rear surfaces may be formed so that the emission surface is inclined. It may be formed by laminating in the vertical direction. However, many optical fibers 28 constituting the first light guide 27
Must have a function of causing image light to enter the incident surface 38 of the second light guide 34, and it is not preferable to use a thin plate-shaped light guide element.

In the above embodiment, the display image of the liquid crystal display panel 21 is enlarged twice in the X direction by the first light guide 27, and the second light guide 34, the first and second light guides are formed. The enlarged image is doubled in the Y direction by the refractors 41, 41, but the enlargement ratio can be 3 to 10 times. In this case, the second light guide 34, the first and second refractors 40, 4
Although expansion in the Y direction by 1 is relatively easy, expansion in the X direction by the first light guide 27 requires uniform deformation as the compression ratio of each optical fiber increases. Although it becomes difficult, in this case, a display image of the liquid crystal display panel 21 reduced in the Y direction may be used. For example, if a liquid crystal display panel in which the pitch of the scanning lines 51 is reduced to 1/5 is used, the displayed image becomes 1/5 in the Y direction.
Is reduced to 2 in the X direction by the first light guide.
If the magnification is doubled, the image emitted from the emission surface of the first light guide is magnified 10 times in the X direction. Therefore, if the second light guide and the first and second refractors magnify 10 times in the Y direction, an image magnified 10 times in the X and Y directions is projected on the screen.

Further, in the above embodiment, the case where one liquid crystal display panel 21 is arranged has been described, but two or more liquid crystal display panels 21 may be arranged. For example, FIG. 8 is a perspective view of a main part of a display device according to a third embodiment of the present invention. This display device includes six liquid crystal display panels 21 and six first light guides 27. In this case, the six liquid crystal display panels 21 are arranged on the same horizontal plane at predetermined intervals. Then, in order to make the gaps and the like between the six liquid crystal display panels 21 invisible on the screen 42, the respective plate-shaped portions 30 of the six first light guides 27 are in close contact with each other. . In this display device, a color liquid crystal display panel 21 having an almost normal structure is provided with six
In this case, the image of the single color liquid crystal display panel is enlarged 12 times in the vertical and horizontal directions, which will be described below.

First, the lower substrate 23 of the liquid crystal display panel 21 on which the thin film transistors and the like are provided has a structure as shown in an equivalent circuit in FIG. This lower substrate 23
2 is different from the lower substrate 23 shown in FIG. 2 in that connection terminals 55A and 55B for the scanning lines 51 are provided on the left side and right side on the upper surface side of the lower substrate 23, respectively. The connection terminals 55A and 55B for the adjacent scanning lines 51 of the adjacent liquid crystal display panels 21 of the six liquid crystal display panels 21 shown in FIG. Further, for example, only the left connection terminal 55A of the left liquid crystal display panel 21 is connected to the flexible wiring board 82 for inputting a scanning signal.

Next, the selection line 5 of the liquid crystal display panel 21
The flexible wiring board 83 (see FIG. 8) connected to the second connection terminal 56 will be described with reference to FIG. On the upper surface of the flexible wiring board 83, three
The set of common signal lines _{R 1, G 1, B 1} , the common signal line _{R 2, G 2, B 2} ......... common signal line R _n, G _n, B _n is,
In the case of VGA regulation, 640 sets (640 x 3 pieces)
Is provided. On the lower surface of one end of the flexible wiring board 83, as a representative, the first set of three common signal lines R
The first set of 18 signal lines R ₁₁ , G ₁₁ , B ₁₁ , R ₁₂ , G ₁₂ , B ₁₂ , R ₁₃ , G ₁₃ , B ₁₃ correspond to ₁ , G ₁ , B _{1.
13, R 14, G 14,} B 14, R 15, G 15, B 15, R 16,
G ₁₆ and B ₁₆ are provided in this order. Of these, the signal lines R ₁₁ , R ₁₂ , R ₁₃ , R ₁₄ , R ₁₅ , R ₁₆ are connected to the common signal line R ₁ via through holes, and the signal lines G ₁₁ , G ₁₂ , G ₁₃ , G ₁₄ , G _15, G ₁₆ is connected via a through hole to the common signal lines G _1, the signal line _{B 11, B 12, B 13} , B 14, B 15, B 16 is via a through hole to the common signal line B ₁ Connected. And
The first set of 18 signal lines R _{11 to} B ₁₆ is connected to the first to eighteenth selection lines 5 of the liquid crystal display panel 21 shown in FIG.
2 are connected to the respective connection terminals 56. Therefore, in the case of the second set of 18 signal lines R _{21 to} B ₂₆ , they are connected to the connection terminals 56 for the selection lines 52 in the 19th to 36th columns of the liquid crystal display panel 21, respectively. The flexible wiring board 83 has a number of signal lines corresponding to the connection terminals 56 for all the selection lines 52 of the six liquid crystal display panels 21, and as described above, every three signal lines are 6 Since each line is connected to one common signal line, in the case of the VGA regulation, 640 common signal lines are formed for each of R, G, and B colors.

Next, display driving of the liquid crystal display panel 21 will be described with reference to FIGS. 9 and 10 as a representative of the first set of three common signal lines R ₁ , G ₁ and B ₁ . Of the first set of three common signal lines R ₁ , G ₁ , and B ₁ , only the common signal line R ₁ receives an image signal for R (red) from an image signal input unit including a normal LSI driver or the like (not shown). When a predetermined television signal is input, the six signal lines R ₁₁ , R ₁₁ connected to the common signal line R ₁
The selection lines 52 of the first, fourth, seventh, tenth, thirteenth, and sixteenth columns of the liquid crystal display panel 21 are provided via the lines ₁₂ , R ₁₃ , R ₁₄ , R ₁₅ , and R _16. The same R image signal is input (that is, to every three selection lines 52 every three lines). At this time, it is assumed that a scanning signal is supplied to the first scanning line 51, for example. Then, the first line, the first
The R thin film transistor 54 in the column, the fourth column, the seventh column, the tenth column, the thirteenth column, and the sixteenth column is turned on, and the R pixel electrode connected to the turned on R thin film transistor 54 The same R image signal is input to 53.
That is, the same image signal for R is input from _one common signal line R1 to predetermined six pixel electrodes 53 for R. Then, display driving according to this input is performed. Therefore, in this case, one pixel is substantially constituted by the eighteen pixel electrodes 53 in the first row, first column to eighteenth column. That is,
In the normal case, one pixel is constituted by the three pixel electrodes 53 in the first row, first column to third column. In this case, the normal six pixels constitute the one pixel. Is configured. Therefore, the one pixel constituted by the ordinary six pixels is used as the scan line 5 by itself.
As described above, the first light guide 27 enlarges the image by 6 times in the same direction, and the image is enlarged 12 times in the horizontal direction as a whole. On the other hand, the enlargement of the image in the vertical direction is performed by the second light guide 34, and when the angle formed between the incident surface and the output surface of the second light guide 34 is about 85.2 °, the same applies. It becomes 12 times.

As described above, since the same image signal is input to each of the six lines on each of the selection lines 52 of the six liquid crystal display panels 21, the six liquid crystal display panels 21 are selected.
Even if the number and arrangement pitch of each of the selection lines 52 are the same as the normal ones, the substantial number of selection lines and the arrangement pitch of the six liquid crystal display panels 21 as a whole are reduced to 1/6.
And 6 times. Therefore, even if one image on the six liquid crystal display panels 21 is enlarged and displayed 12 times in the vertical and horizontal directions, almost normal liquid crystal display panels 21 can be used. Further, since the six first light guides 27 are the same, it is possible to easily cope with a change in the number of the liquid crystal display panels 21 arranged.

In the above embodiment, a color liquid crystal display panel has been described. However, the present invention can be applied to a monochrome display. When the present invention is applied to a monochrome display liquid crystal display panel, one common signal line 84 provided on the lower surface of the flexible wiring board 84 is divided into six lines as in a fourth embodiment of the present invention shown in FIG. The signal lines 86a, 86b, 86c, 86d, 86e, and 86f are branched, and the six signal lines 86a, 86b, 86c,
86d, 86e, 86f through the first of the liquid crystal display panel.
The same image signal may be input to the selection lines in the columns to the sixth column (that is, six adjacent selection lines).

Further, in the above embodiment, for example, as shown in FIG. 1, the case where the first light guide 27 has a left-right symmetrical shape has been described. , The length in the horizontal (X) direction of the exit surface 33 is equal to the entrance surface 3.
It suffices that the length is larger than the length of 2 in the same direction.

Further, an EL display, an LED display, a plasma display, a CRT display, or the like may be used as the display in addition to the liquid crystal display panel.

[0024]

As described above, according to the present invention, the image of the display is enlarged in the horizontal direction by the first light guide and is enlarged in the vertical direction by the second light guide. A normal display can be used.

[Brief description of the drawings]

FIG. 1 is a perspective view of a display device according to a first embodiment of the present invention, in which a part of a main part is cut away.

FIG. 2 is a view showing an equivalent circuit of a lower substrate of the liquid crystal display panel shown in FIG. 1;

FIG. 3 is a vertical sectional side view of a part of a second light guide and a refractor shown in FIG. 1;

FIGS. 4A to 4C are perspective views each illustrating an example of a method for forming the first light guide shown in FIG. 1;

FIG. 5 is a perspective view illustrating an example of a method for forming the second light guide shown in FIG. 1;

FIG. 6 is a perspective view of a main part of a display device according to a second embodiment of the present invention.

FIG. 7 is a perspective view for explaining another example of the second light guide.

FIG. 8 is a perspective view of a main part of a display device according to a third embodiment of the present invention.

FIG. 9 is an equivalent circuit diagram showing a lower substrate of the liquid crystal display panel shown in FIG. 8;

10 is a plan view showing a part of an example of a flexible wiring board connected to a connection terminal for a selection line of the liquid crystal display panel shown in FIG. 8;

FIG. 11 is a plan view showing a part of an example of a flexible wiring board connected to a connection terminal for a selection line of a liquid crystal display panel when the fourth embodiment of the present invention is applied to a liquid crystal display panel for monochrome display.

FIG. 12 is a perspective view in which a part of an example of a conventional display device is cut away.

[Explanation of symbols]

 Reference Signs List 21 liquid crystal display panel 24 backlight unit 27 first light guide 34 second light guide 40 first refractor 41 second refractor 42 screen 51 scan line 52 selection line

Claims (10)

[Claims] 1. A first light guide in which a lateral length of an exit surface is larger than a lateral length of an incident surface, and a display disposed on the incident surface side of the first light guide. A display device comprising: an entrance surface corresponding to the exit surface of the first light guide; and a second light guide having an exit surface inclined with respect to the entrance surface. 2. The light-emitting surface side is arranged close to each other,
N first light guides in which the lateral length of the exit surface is greater than the lateral length of the incident surface, and each of the n first light guides are disposed on the respective incident surface side. n display bodies, and n
A display device comprising: an entrance surface corresponding to an exit surface of each of the first light guides; and a second light guide having an exit surface inclined with respect to the entrance surface. 3. The light-exiting surfaces are arranged close to each other,
N first light guides in which the lateral length of the exit surface is greater than the lateral length of the incident surface, and arranged on each of the entrance surfaces of the n first light guides, A second display body having n display bodies each having a large number of scanning lines and selection lines, an entrance surface corresponding to the exit surface of the n first light guides, and an exit surface inclined with respect to the entrance surface; A light guide, and the n
A display device, comprising: image signal input means for inputting the same image signal to each of a predetermined number of selected lines of each of the display bodies. 4. The invention according to claim 1, wherein the second light guide is inclined in a direction crossing a length direction of the first light guide. Display device. 5. The invention according to claim 1, wherein each of the first light guides has a lateral length at an end on the exit surface side and a lateral length at an end on the incident surface side. A display device comprising: a plurality of light guide elements that are longer than a length in a direction and are closely attached to each other. 6. The invention according to claim 5, wherein the first
Each light guide element constituting the light guide of the present invention is characterized in that the cross section of the exit surface side end is substantially circular, and the cross section of the incident surface side end is substantially elliptical with the transverse direction as a short axis. Display device. 7. The display device according to claim 3, wherein connection terminals are provided at both ends of the scan lines of the display body, and each of the n display bodies has a corresponding scan line of an adjacent display body. The display device is connected to each other via a connection member. 8. The invention according to any one of claims 2 to 7, wherein each of the display bodies is capable of displaying the same image as the image of the n display bodies by itself. Display device. 9. The display device according to claim 2, wherein the second light guide enlarges an image of each of the display bodies by n times in a vertical direction. 10. The invention according to claim 1, wherein the ratio of the length to width of the display area of the display is approximately 3: 4 or approximately 9:16. Display device.