JPH07245733A - Image magnification device - Google Patents

Abstract

PURPOSE:To provide a simple device capable of magnifying an image on a liquid crystal display device or the like. CONSTITUTION:Plural paths 7 tying a light receiving face and its display image in the image magnification device 1 are provided to a base part 2 made of a light transmissive material having the light receiving face 3 installed opposite to the screen of an image display device 5 and the display screen 4 almost in parallel with the light receiving face 3 and whose area is larger than the area of the light receiving face and the optical paths are made of a 2nd light transmissive material whose refractive index is higher than that of the 1st transmissive material. As a result, a light being an image output of the display device is received from the light receiving face of the base part, the light is reflected at a critical angle on a boundary face between the 1st and 2nd transmissive materials and carried in the optical paths, and the light is carried up to the display screen whose screen area is larger than that of the light receiving face, on which the light is displayed on a magnified pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen enlarging device, and more particularly to a screen enlarging device for enlarging and displaying a screen of a flat panel type image display device such as a liquid crystal display device (LCD) with a simple structure. .

[0002]

2. Description of the Related Art In recent years, personal computers and other O
As home appliances such as A-equipment and televisions become lighter and thinner, display devices are also required to be lighter and thinner. Therefore, C which is more popular than before
As an alternative to RT, a liquid crystal display (LCD),
The magnetic fluid display according to the applicant (Japanese Patent Application No. 5-
Development of lightweight and thin flat panel displays such as No. 191787 and Japanese Patent Application No. 5-270063) is under way.

While such light weight and thinness are required,
For display devices, the demand for larger screens has been constantly exclaimed from the standpoint of improving visibility and realism.
Flat panel displays such as liquid crystal displays are no exception. However, in order to simultaneously meet the needs for large screens, light weight, and thinness, there is no choice but to perform uniform microfabrication in a much larger area than in LSI manufacturing, which is a large LCD manufacturing process yield. Has become a major factor in lowering. In particular, the difficulty of increasing the screen size is dramatically increased in the case of an active matrix liquid crystal display (AM-LCD) using a TFT (thin film transistor) which attracts attention with excellent operation performance, and therefore, its solution is desired. There is.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems associated with the enlargement of the screen of the conventional flat panel type display device, and its object is to provide an optical fiber. It is possible to easily manufacture with inexpensive materials without using expensive parts such as, and it is possible to enlarge the image displayed on the liquid crystal screen to the desired size without degrading the image quality. It is to provide a new and improved screen enlarging device.

Still another object of the present invention is to use a screen enlarging device in a block form even if a plurality of image display devices are combined to obtain a large screen.
To provide a new and improved screen enlarging device capable of constructing a 0-inch class large screen, and in that case, capable of obtaining a high-quality image in which the seam of each block does not affect the image quality. Is.

[0006]

In order to solve the above-mentioned problems, a screen enlarging device according to a first aspect of the present invention has a light-receiving surface which is installed so as to face a screen of an image display device, and a light-receiving surface which is substantially opposed to the light-receiving surface. A base made of a first light transmissive material having a display surface which is parallel and has an enlarged area larger than that of the light receiving surface is provided with one or a plurality of optical paths connecting the light receiving surface and the display surface, It is characterized in that the optical path is composed of a second light transmissive material having a refractive index higher than that of the first light transmissive material.

Further, according to a second aspect, each light path of the screen enlarging device according to the first aspect is arranged on the light receiving surface at each pixel at a position substantially corresponding to each pixel of the screen of the image display device. The light inlets arranged at substantially the same pitch as above and the light outlets arranged on the display surface at a larger pitch than the pitch on the light receiving surface are communicated with each other. Regarding the structure of the light path, according to claim 3, the light inlet and the light outlet are configured to have substantially the same diameter, and according to claim 4, the light outlet has a diameter smaller than that of the light inlet. It is configured to have a large diameter.

Further, according to a fifth aspect of the present invention, each light path of the screen enlarging device is formed as a through hole that opens in the light receiving surface and the display surface, and the second light that is a fluid is in each of the through holes. A configuration is provided in which a transparent material is filled and both open ends thereof are sealed by a sealing member made of a light-transmissive material. Further, according to claim 6, each light path of the screen enlarging device is formed as a blind hole opened on either of the light receiving surface or the display surface, and the second light transmission which is a fluid is passed through each blind hole. There is provided a configuration in which a conductive material is filled and the opening end thereof is sealed by a sealing member made of a light transmissive material. According to the seventh aspect, the sealing member that seals the through hole or the blind hole is composed of a plate-shaped member that covers the light receiving surface and / or the display surface.

According to another aspect of the present invention, for example, when it is desired to obtain a large screen by using a plurality of image display devices, a base portion constructed according to the present invention is used as described in claim 8. By dividing into a plurality of blocks and configuring so that the boundary surface of each adjacent block does not cut the optical path, further, as described in claim 9, the boundary surfaces of each adjacent block are complementarily combined. It is possible to configure.

Furthermore, as to the brightness adjustment for obtaining a clearer screen, as described in claim 10,
It is preferable to adjust the brightness of the light incident on the light entrances of the light paths distributed near the periphery of the base to be brighter than the brightness of the light incident on the light entrances of the light path distributed near the center of the base.

According to the present invention, the image display device for enlarging an image is a flat panel type display device such as a liquid crystal display device (LCD) or a magnetic fluid display as described above. Is more effective.

[0012]

The screen enlarging device of the image display device constructed according to the present invention as described above has the following excellent effects.

According to the first aspect of the invention, one or a plurality of optical paths made of water, acrylic or the like are provided on the base made of, for example, glass or transparent plastic.
Since the light transmissivity of the second light transmissive material forming the optical path is higher than the light transmissivity of the first light transmissive material, the base portion acts as a clad as well as the optical fiber as in the optical fiber. Because the path acts as a core, it is possible to critically reflect light at the interface and carry it in the optical path. As a result, it is possible to convey the screen of the image display device incident from the light receiving surface of the base to a display surface having an enlarged area than the light receiving surface and display it as an enlarged screen.

According to the second aspect of the invention, since the light entrances of the respective light paths are arranged at substantially the same pitch as the pitch of each pixel on the screen of the image display device, the light output from each pixel corresponds. It becomes possible to receive light through the optical path. Since the light outlets are arranged at the enlargement pitch rather than the pitch of each pixel on the screen, the screen can be enlarged by the enlargement ratio without degrading the image quality.

According to the third aspect of the invention, since the light entrance and the light exit of each light path are configured to have substantially the same diameter, the light exit can be performed without attenuating the intensity of the light received from the light entrance. A clear screen can be obtained by emitting light from.

According to the invention of claim 4, unlike the invention of claim 3, since the diameter of the light exit is larger than the diameter of the light entrance of each light path, the pixel density of the screen is increased. You can get an enlarged screen without dropping too much.

According to the invention of claim 5 or 6,
Each optical path is configured as a through hole or blind hole, and each through hole or blind hole is filled with a fluid such as water or liquid plastic to form an optical path. Therefore, it is possible to construct an optical path at a much lower cost. And claim 5 or claim 6
The through-hole or blind-hole opening described in [7] can simultaneously and easily seal a plurality of optical paths by using a plate-shaped sealing member as described in [7]. .

Further, as described in claim 8, by forming the base portion where the optical path is formed from a plurality of blocks, an image display device such as a small liquid crystal display device is combined and each image display device is combined. On the other hand, by associating each block with each other, a large screen can be easily obtained. At this time, according to the present invention, since the boundary surface of each adjacent block is configured not to cut the optical path, the boundary line of the block does not affect the image quality. Then, as described in claim 9, so as to complementarily combine the boundary surfaces of the adjacent blocks, for example, by combining honeycomb contours, combining semicircles, or forming a zigzag shape, Blocks can be easily combined.

When the area of the display surface is made larger than that of the light receiving surface of the base according to the present invention, it is closer to the peripheral portion of the base than the light path from the light receiving surface to the display surface in the central portion of the base. The length of the light path from the light receiving surface to the display surface is longer, and the peripheral portion of the display surface is darker than the central portion, which may cause a difference in brightness on the display surface. However, as described in claim 10, the brightness of the light incident on the light entrance of the light path distributed near the periphery of the base is larger than the brightness of the light incident on the light entrance of the light path distributed near the center of the base. By adjusting so as to be bright, it is possible to obtain a screen of good image quality with no difference in brightness.

Further, as described in claim 11, the present invention has the most excellent effect when enlarging the screen of a flat panel type display device such as a liquid crystal display device or a magnetic fluid display.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a screen enlarging device constructed according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan view showing a display surface portion of a base 2 of a screen enlarging device 1 constructed according to the present invention, and FIG. 2 is a bottom view of the base 2 of the screen enlarging device 1. FIG. 3 is a side view of the base portion 2 of the screen enlarging device 1.
As shown in the figure, the base portion 2 of the screen enlarging device 1 has a cross section substantially in the shape of an inverted isosceles trapezoid, and its short side is formed as a light receiving surface 3 and its long side is a display surface 4. Is configured as.

The base 2 of the screen enlarging device 1 can be composed of a first transparent member such as acrylic or styrene, and a plurality of, preferably a plurality of, light-receiving surfaces 3 to a display surface 4 shown in FIG. The number of light paths 7 corresponding to the pixels of the screen 6 of the liquid crystal display device 5 shown is provided. This optical path 7 is composed of a second transparent member having a higher refractive index than the first transparent member. Therefore, the base 2
And the optical path 7 as a core, the light received from each light inlet 8 on the light receiving surface is conveyed to the corresponding light outlet 9 on the display surface by the same principle as an optical fiber. It is possible.

The first transparent member forming the base 2 and the second transparent member forming the light path 7 of the screen enlarging device 1 constructed according to the present invention have, for example, a refractive index of 1.49, respectively. Delpet of 1.60, polystyrene of 1.60, AS resin of 1.57, polycarbonate of 1.59, hard vinyl chloride of 1.54 and the like can be appropriately combined and configured.

5 and 6 show a method of manufacturing the screen enlarging device 1. In the example shown in FIG. 5, a plurality of through holes are formed as an optical path 7 ′ in the base 2 made of the first transparent member. Then, for example, after the light inlet 8'opened in the light receiving surface 3'is sealed with a plate-like member such as glass or transparent plastic, a second transparent member which is a fluid such as water is injected into each through hole, Further, it is possible to seal the light outlet 9'opened on the display surface 4'with a plate member such as glass or transparent plastic.

On the other hand, in the example shown in FIG. 6, a plurality of blind holes are formed as the optical path 7 "in the base 2 made of the first transparent member. Then, each blind hole is shown in FIG. After injecting a second transparent member, which is a fluid such as water, as in the example,
The light outlet 9 ″ opening on the surface 4 ″ can be configured by sealing with a plate member such as glass or transparent plastic.

As described above, whichever manufacturing method is adopted, the screen enlarging device constructed according to the present invention is
In contrast to the case of manufacturing optical fibers, for example, in a much cheaper material and in a much simpler way, the base 2 made of the first transparent member, which acts as a clad, and the second transparent material, which acts as a core. Since it is possible to form an optical path made of a member, it is possible to reduce the manufacturing cost.

The optical paths 7 formed in the base portion 2 can be formed in any number, any size, and any distribution, but it is preferable that the optical path 7 of an image device in which the screen is enlarged is used. With the same pitch as the pixels distributed on the screen,
That is, the number of light inlets 8 substantially equal to the number of pixels is formed at the position of the light receiving surface 3 substantially corresponding to the position of each pixel.
From each light entrance 8 of the light receiving surface 3, a light path 7 is formed toward the display surface 9 so as to linearly expand in a radial manner. Thus, on the display surface 4, the light distributed at the expansion pitch with respect to the pixels distributed on the screen to be expanded, that is, at the intervals substantially larger than the intervals between the pixels but substantially equal to the number of pixels. Since the outlet 9 is formed, it is possible to enlarge the screen of the liquid crystal display device or the like.

Regarding the dimensions of the light path 7 formed in the base 2, as shown in FIG. 7, the light receiving surface and the display surface are formed to have substantially the same diameter to suppress the attenuation of light and provide a clear screen. Alternatively, as shown in FIG. 8, a magnified image in which the pixel pitch of the screen to be magnified is maintained as it is, is configured such that the diameter gradually increases from the light receiving surface to the surface as shown in FIG. It is also possible to obtain it. In any case, the enlargement ratio of the image is the area ratio between the light receiving surface and the display surface, more precisely, the distance between the centers of the adjacent light entrances formed on the light receiving surface and the adjacency formed on the display surface. Is determined by the ratio of the distance between the centers of the light outlets, and the brightness of the magnified image obtained is determined by the material of the light path 7 to be used and the length and diameter of the light path 7. It is possible to adopt arbitrary dimensions depending on

Since the longer the optical path 7 is, the greater the attenuation is, the brightness of the obtained magnified image is weaker in the peripheral portion than in the central portion of the screen enlarging device 1. In such a case, the brightness of the light entering the light entrances of the light paths distributed near the center of the base 2 becomes brighter than the brightness of the light entering the light entrances of the light paths distributed near the center of the base 2. By making such adjustments, it is possible to obtain a screen with good image quality with no difference in brightness.

Next, referring to FIG. 9, regarding the actual operation of the screen enlarging device 1 constructed according to the present invention,
The case of enlarging the screen of the FT type liquid crystal display device will be described as an example. The illustrated TFT liquid crystal display device has a structure in which two glass substrates 10a and 10b are opposed to each other with a space of several μm therebetween and fixed, and a liquid crystal 11 is sealed in the gap. The signal lines and the scanning lines are arranged in a matrix on the lower glass substrate 10b, and the pixel electrodes 12 are arranged at the intersections thereof.
Are arranged. A common electrode 13 and a color filter 14 are arranged on the lower side of the upper glass substrate. This TFT type liquid crystal display device is provided with two deflection plates 15a and 15b.
It is sandwiched by and is made to enter white light to form a transmissive display device. The color filters are R (red), G (green), and B.
It consists of three primary colors (blue) and is arranged corresponding to each pixel electrode.

When the screen of the TFT type liquid crystal display device constructed as described above is to be enlarged by the screen enlarging device 1 constructed according to the present invention, the screen enlarging device 1 is closely attached to the deflection plate 15. Arrange to do. At that time, according to the present invention, since the light entrances 8 of the respective light paths 7 are arranged at substantially the same pitch as the pixels of the TFT type liquid crystal display device, the light entrances 8 correspond to the positions of the respective pixels. The light output from each pixel can be efficiently received by positioning so as to come to the position.

By thus combining the TFT type liquid crystal display device and the screen enlarging device 1, the liquid crystal display device is driven to output from the upper deflection plate 15a,
The light received from the light entrance 8 reaches the light exit 9 while repeatedly undergoing critical reflection at the boundary surface between the first transparent material of the base 2 and the second transparent material of the light path 7. 4, it is possible to obtain a magnified screen enlarged by the area ratio of the light receiving surface 3 and the display surface 4, more precisely, the pitch ratio of the light inlet 8 and the pitch ratio of the light outlet 9 without degrading the image quality. is there.

Next, referring to FIGS. 10 to 13, an embodiment in which the screen enlarging device 1 constructed according to the present invention is divided into a plurality of blocks and a plurality of liquid crystal display devices are combined to obtain a large screen of 100-inch class. Will be described.

FIG. 10 is a plan view of one block when the screen enlarging device 1 constructed according to the present invention is divided into blocks and viewed from the display surface side. As shown in the figure, in this block, a plurality of optical paths 9 are aggregated in a honeycomb shape, and the aggregates are regularly arranged in a staggered manner throughout. Then, according to the present invention, the boundary surface of the block is processed into a concavo-convex shape in which semicircles having opposite directions are alternately continuous so that the light paths 9 arranged alternately are not cut by the boundary surface. There is. By constructing the boundary surface in this way, each block is
Even in the case of the combination as shown in FIG. 1, it is possible to prevent the situation in which the optical path is blocked at the boundary surface, pixels are skipped on the boundary surface, and missing lines remain, which deteriorates the image quality. is there.

In the embodiment shown in FIGS. 10 and 11, the boundary surface is constituted by the concavo-convex shape in which the semicircles whose directions are opposite to each other are alternately continuous, but the present invention is not limited to this embodiment. For example, as shown in FIG. 12, the honeycomb-shaped partial contours can be formed in an alternating concavo-convex shape, or as shown in FIG. 13, can be configured in a concavo-convex shape in which straight lines are simply continuous in a zigzag. The point is that any boundary surface can be adopted as long as the optical path 7 formed on the base 2 is not cut and the adjacent blocks complementarily combine with each other. It is possible. By adopting the above-mentioned configuration, it is possible to obtain a large screen image without interruption by combining a plurality of liquid crystal display devices and installing a screen enlarging device for each liquid crystal display device. Become.

In the above embodiments, the case of enlarging the screen obtained by the TFT type liquid crystal display device has been described as an example, but the present invention is not limited to such embodiments. In addition to this, a flat panel type display device such as a magnetic fluid display device according to the applicant of the present application, and a CR
It can also be used to enlarge the screen of a display device such as T. Furthermore, in the case of using a block-type screen enlarging device, it is possible to combine the blocks and the display device in a one-to-one correspondence as in the above-described embodiment, or a plurality of blocks may be combined depending on required conditions. It is also possible to use the block for one display device, or conversely, use one block for a plurality of display devices.

[0038]

According to the first aspect of the invention, the light path made of the second light transmissive material is provided on the base made of the first light transmissive material. Since the light transmittance of the second light transmissive material forming the light path is higher than the light transmittance of the first light transmissive material, the base portion should act as a clad and the light path should act as a core. Thus, it is possible to carry out critical reflection of the received light at the boundary surface and carry it in the optical path with a much cheaper and simpler structure than the optical fiber. As a result, it is possible to convey the screen of the image display device, which is incident from the light receiving surface of the base portion, to the display surface with an enlarged area larger than that of the light receiving surface and display the enlarged screen.

According to the second aspect of the present invention, since the light entrances of the respective light paths are arranged at substantially the same pitch as the pitch of each pixel of the screen of the image display device, the light output from each pixel corresponds. It becomes possible to receive light through the optical path. Since the light outlets are arranged at the enlargement pitch rather than the pitch of each pixel on the screen, the screen can be enlarged by the enlargement ratio without degrading the image quality.

According to the third aspect of the present invention, the light entrance and the light exit of each light path have substantially the same diameter, so that the intensity of the light received from the light entrance is not attenuated and the light exits from the light exit. It is possible to emit light and obtain a clear screen. Alternatively, as in the invention of claim 4, by configuring the diameter of the light outlet to be larger than the diameter of the light inlet of each light path,
It is possible to obtain an enlarged screen without significantly reducing the pixel density of the screen.

As in the invention of claim 5 or claim 6,
Compared to conventional optical fiber etc. by configuring each optical path as a through hole or blind hole and filling each through hole or blind hole with a fluid such as water or liquid plastic to configure the optical path. Therefore, it is possible to construct an optical path much cheaper and easier. The opening of the through hole or the blind hole according to claim 5 or 6 uses a plate-shaped sealing member as described in claim 7, so that a plurality of optical paths can be easily and simultaneously formed. Can be sealed.

Further, as described in claim 8, by forming the base portion where the optical path is formed from a plurality of blocks, an image display device such as a small liquid crystal display device is combined, and each image display device is combined. On the other hand, by associating each block with each other, a large screen can be easily obtained. At this time, according to the present invention, since the boundary surface of each adjacent block is configured not to cut the optical path, the boundary line of the block does not affect the image quality. Then, as described in claim 9, so as to complementarily combine the boundary surfaces of the adjacent blocks, for example, by combining honeycomb contours, combining semicircles, or forming a zigzag shape, Blocks can be easily combined.

When the area of the display surface is made larger than that of the light receiving surface of the base according to the present invention, it is closer to the peripheral portion of the base than the light path from the light receiving surface to the display surface in the central portion of the base. The length of the light path from the light receiving surface to the display surface is longer, and the peripheral portion of the display surface is darker than the central portion, which may cause a difference in brightness on the display surface. However, as described in claim 10, the brightness of the light incident on the light entrance of the light path distributed near the periphery of the base is larger than the brightness of the light incident on the light entrance of the light path distributed near the center of the base. By adjusting so as to be bright, it is possible to obtain a screen of good image quality with no difference in brightness.

Further, as described in claim 11, the present invention has the most excellent effect when enlarging the screen of a flat panel type display device such as a liquid crystal display device or a magnetic fluid display.

[Brief description of drawings]

FIG. 1 is an enlarged view showing a display surface portion of a screen enlarging device configured according to the present invention.

FIG. 2 is an enlarged view showing a light receiving surface portion of a screen enlarging device constructed according to the present invention.

FIG. 3 is a side view of a screen enlarging device configured according to the present invention.

FIG. 4 is a schematic cross-sectional view showing a combination of a screen enlarging device and a display device configured according to the present invention.

FIG. 5 is a schematic cross-sectional view of a first embodiment illustrating a method of forming an optical path of a screen enlarging device configured according to the present invention.

FIG. 6 is a schematic cross-sectional view of a second embodiment showing a method of forming an optical path of a screen enlarging device configured according to the present invention.

FIG. 7 is a schematic cross-sectional view of the first embodiment showing the structure of the optical path of the screen enlarging device configured according to the present invention.

FIG. 8 is a schematic cross-sectional view of a second embodiment showing the structure of the optical path of the screen enlarging device configured according to the present invention.

FIG. 9 is an explanatory diagram showing an operation of the screen enlarging device configured according to the present invention.

FIG. 10 is a plan view showing a screen enlarging device divided into blocks according to the present invention.

FIG. 11 is an explanatory diagram showing an embodiment of a screen enlarging device which is divided into blocks according to the present invention.

FIG. 12 is an explanatory diagram showing another embodiment of a screen enlarging device which is divided into blocks according to the present invention.

FIG. 13 is an explanatory diagram showing still another embodiment of the screen enlarging device which is divided into blocks according to the present invention.

[Explanation of symbols]

 1 Screen Enlarging Device 2 Base 3 Light-Receiving Surface 4 Display Surface 5 Display Device 6 Screen 7 Optical Path 8 Optical Inlet 9 Optical Outlet

Claims (11)

[Claims] 1. A first light having a light receiving surface which is installed to face a screen of an image display device, and a display surface which is substantially parallel to the light receiving surface and has an enlarged area larger than that of the light receiving surface. In a screen magnifying device including a base made of a transparent material, one or a plurality of optical paths connecting the light receiving surface and the display surface of the base are provided, and the optical path is provided more than the first light transmissive material. A screen magnifying device comprising a second light transmissive material having a high refractive index. 2. The light entrances in which the respective light paths are arranged at positions substantially corresponding to the respective pixels of the screen on the light receiving surface at substantially the same pitch as the respective pixels, and the pitch on the display surface. The screen enlarging device according to claim 1, wherein the screen enlarging device communicates with light outlets arranged at an enlarging pitch. 3. The screen enlarging device according to claim 2, wherein the light inlet and the light outlet have substantially the same diameter. 4. The diameter of the light outlet is made larger than the diameter of the light inlet.
Screen enlargement device described in. 5. Each of the light paths is formed as a through hole that opens in the light receiving surface and the display surface, and each of the through holes is filled with the second light transmissive material that is a fluid, The both open ends are sealed by a sealing member made of a light transmissive material.
The screen magnifying device according to any one of 2, 3 and 4. 6. Each of the light paths is formed as a blind hole that opens on either the light receiving surface or the display surface, and each of the blind holes is filled with the second light transmissive material that is a fluid. The screen enlarging device according to claim 1, wherein the opening end is sealed by a sealing member made of a light transmissive material. 7. The screen enlarging device according to claim 5, wherein the sealing member is a plate-like member that covers the light receiving surface and / or the display surface. 8. The substrate according to claim 1, wherein the base portion is composed of a plurality of blocks, and the boundary surface of each adjacent block is configured not to cut the optical path.
The screen enlargement device according to any one of 3, 4, 5, 6 and 7. 9. The screen enlarging apparatus according to claim 8, wherein the boundary surfaces of the adjacent blocks are configured so as to be complementarily assembled with each other. 10. The brightness of the light incident on the light entrance of the light path distributed near the periphery of the base becomes brighter than the brightness of the light incident on the light entrance of the light path distributed near the center of the base. The screen enlarging device according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the screen enlarging device is adjusted as follows. 11. The image display device is a flat panel type display device, as claimed in claim 1,
The screen enlargement device according to any one of 4, 5, 6, 7, 8, 9 and 10.