KR101741912B1 - Image magnifier - Google Patents

Abstract

The present invention relates to an image magnifying apparatus, and more particularly, to an image magnifying apparatus comprising: a backlight member which converts an outgoing point light source into linear polarized light and converts the phase to output circularly polarized light; a panel member for emitting a displayed image to the front surface through the backlight member; A diffusing member positioned at a front surface of the panel member and diffusing the image; and a diffusing member for diffusing the image, after passing and reflecting light corresponding to the image diffused through the diffusing member, It is possible to provide an image enlarging device capable of enlarging a small image even with a simple configuration.

Description

IMAGE ENLARGEMENT APPARATUS {IMAGE MAGNIFIER}

The present invention relates to an image enlarging apparatus capable of enlarging an image displayed on a wireless terminal without distortion.

As is well known, a wireless terminal can transmit and receive data (e.g., voice, text, video, etc.) to and from a communication partner using wireless communication, for example, a mobile phone, a smart phone, or the like.

As wireless terminals become more generalized, users' demands for improvement of their performance and functions are gradually increasing. However, the size and volume of the wireless terminal are getting smaller and the size of a screen window for displaying an image is getting smaller.

However, as the size of the window decreases, the displayed image can not be viewed properly.

On the other hand, there is a projector for enlarging and projecting an image displayed on a large-sized liquid crystal panel on a large-screen screen. An apparatus for enlarging and displaying an image of a computer, a DVD player, a camcorder, a VCR, Is an apparatus in which an image obtained by passing an artificial lamp light source through a moving image panel is enlarged and projected on a screen through a lens.

Accordingly, in recent years, a wireless terminal equipped with a projector function has been developed and sold in order to enlarge and display an image of a conventional wireless terminal. When an image is outputted through the projector function of such a wireless terminal, There is a problem that the image of the wireless terminal is enlarged and emitted.

1. Published patent application No. 10-2012-0042404 (published on May 3, 2012): Mobile terminal 2. Registration No. 10-1189845 (Registered on April 4, 2012): Wireless terminal device

The present invention provides an image enlarging device capable of enlarging an image displayed on a wireless terminal without distortion.

The present invention also provides a simple configuration by emitting a point light source as circularly polarized light, diffusing an image positioned on the front surface thereof, and then outputting a diffused virtual image corresponding to the image through a concave mirror, a phase delay plate, An image enlarging device capable of enlarging a small image can be provided.

Meanwhile, the present invention converts an image displayed through a display device into a circularly polarized light and outputs it as a curved image through a convex lens, and outputs a diffused virtual image corresponding to the image through a concave mirror, a phase delay plate and a reflection type polarizing plate And to provide an image enlarging device capable of enlarging a small image even with a simple structure that can be detachably attached to a display device.

The objects of the embodiments of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description .

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a backlight member that converts an outgoing point light source into linear polarized light and converts the phase to output circularly polarized light; a panel member that outputs a displayed image to the front surface through the backlight member; A diffusing member positioned at a front surface of the panel member and diffusing the image; and a diffusing member for diffusing the diffusing member, after passing and reflecting light corresponding to the diffused image through the diffusing member, An enlarging device that emits an enlarged virtual image can be provided.

According to another aspect of the present invention, there is provided an image display apparatus including: an image output member that converts a phase of an image displayed through a display device and then outputs a curved image; And an enlarging member which emits an enlarged virtual image corresponding to the image through reflection and passing through the image enlarging device.

The present invention is characterized in that the diffused virtual image corresponding to the image is emitted through a concave mirror, a phase delay plate and a reflection type polarizing plate after the point light source is emitted as circularly polarized light, You can zoom in on a small image.

Further, the present invention converts an image displayed through a display device into a circularly polarized light and outputs it as a curved image through a convex lens, and outputs a diffused virtual image corresponding to the image through a concave mirror, a phase delay plate and a reflection type polarizing plate , A small image can be enlarged and viewed even with a simple configuration that can be detachably attached to a display device.

FIGS. 1A to 1C are views for explaining the operation principle of the image enlarging apparatus according to the embodiment of the present invention,
2A to 2C are views for explaining an image enlarging apparatus according to an embodiment of the present invention,
3A to 3D are views for explaining inverse distortion of the image of the panel member 120 according to an embodiment of the present invention,
4A to 4D are views for explaining an image enlarging apparatus according to another embodiment of the present invention.

Advantages and features of embodiments of the present invention and methods of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A to 1C are views for explaining the operation principle of an image enlarging apparatus according to an embodiment of the present invention.

Referring to FIGS. 1A to 1C, when an image is positioned between a concave mirror and an eye, a virtual image is generated by the concave mirror. When the image is positioned near the focus of the concave mirror The virtual image can be formed relatively far away, and the position where the virtual image is formed can be adjusted by adjusting the distance of the image.

1B shows an optical principle in which a virtual image is formed. Since Fig. 1C applies aberration to both right and left visual fields, there is no influence on image recognition without considering the spherical aberration of the concave mirror. .

In addition, it can be seen that the virtual image formed corresponding to the image through the concave mirror is not distorted at all. Of course, there may be a slight effect on the accuracy of the concave mirror, but it can be seen that the accuracy of the concave mirror manufactured according to the known technique is such that the human eye can not be detected.

Hereinafter, as shown in FIG. 1A, when an image is displayed through a display device, it is possible to prevent the image from being seen due to the display device. By using the optical principle as described above, Describe techniques that are not interrupted.

Next, an image enlarging apparatus according to an embodiment capable of enlarging an image using the above-described principle will be described.

2A to 2C are views for explaining an image enlarging apparatus according to an embodiment of the present invention.

2A to 2C, an image magnifying apparatus 100 according to an exemplary embodiment of the present invention includes a backlight 110, a panel 120, a diffuser 130, a magnifier 140, and the like.

The backlight member 110 converts the outgoing point light source into linearly polarized light and converts the phase to a circularly polarized light. The backlight member 110 includes a light box (LED box) 112, a polarizer 114, a first phase delay plate a quarter wave retarder 116, and the like.

The light source box 112 accommodates a plurality of white LED light sources and emits the point light source through an exit port provided in the light emitting direction.

The polarizing plate 114 is provided in an exit port of the light source box 112 to convert the point light source emitted through the light source box 112 to linearly polarized light.

The first phase delay plate 116 is provided on the front surface of the polarizing plate 114 to convert the phase of 1/4 wavelength and emit the circularly polarized light.

The panel member 120 displays an image including an LCD panel or the like, and can project an image to be displayed on the front surface through circularly polarized light emitted from the backlight member 110.

The diffusion member 130 may be positioned on the front surface of the panel member 120 to diffuse an image emitted from the panel member 120. The diffusion member 130 may be disposed such that the convex portion of the diffuser plate faces the front surface, so that the image can start and diffuse on the diffuser plate, which is a part of the sphere.

The magnifying member 140 emits an enlarged virtual image corresponding to the image through phase conversion, reflection and passage of light after passing and reflecting the light corresponding to the image diffused through the diffusion member 130, a half mirror 142, a quarter wave retarder 144, a reflective polarizer 146, a regular absorptive polarizer 148, and the like .

A thin glass substrate 147 for supporting thin films may be provided between the reflection type polarizing plate 146 and the absorption type polarizing plate 148.

The concave mirror 142 is mirror-coated with a translucent thin plate made of transparent plastic, and it is possible to reflect half of the light corresponding to the diffused image passing through the half.

Thereafter, the concave mirror 142 may reflect the half of the light passing through the second phase delay plate 144, which will be described later, while passing the light through the half mirror in the front direction.

The concave mirror 142 and the diffusion member 130 may be disposed such that the convex spherical surfaces face each other.

The second phase delay plate 144 is disposed perpendicularly to the first phase delay plate 116 provided on the backlight member 110 and is disposed in the front direction of the concave mirror 142 in the light output direction, It is possible to convert the phase as much as the wavelength and convert the circular polarized light into linear polarized light and emit it.

Thereafter, the second phase delay plate 144 transmits the light reflected through the reflection type polarizing plate 146, which will be described later, to the concave mirror 142, and the light reflected through the concave mirror 142 is again transmitted through the 1/4 It is possible to transmit linearly polarized light whose phase is shifted by a wavelength to the reflective polarizing plate 146

The reflection type polarizing plate 146 is provided adjacent to the second phase delay plate 144 for reflecting the linearly polarized light in one direction and passing the linearly polarized light perpendicular thereto, Reflected by the second phase delay plate 144 can be reflected again.

Thereafter, the reflection type polarizing plate 146 can again emit an enlarged virtual image corresponding to the image while passing the light transmitted from the second phase delay plate 144.

The light passing through the process as described above can be seen in a virtual image corresponding to the position of the diffusion member 130 while converging near the field of view of the observer and the diffusion member 130 can be focused on the focal point of the concave mirror 142 The enlarged virtual image can be seen without being visible to the panel member 120 where the image starts.

The absorption type polarizing plate 148 may be disposed adjacent to the reflection type polarizing plate 146 and may include a reflection type polarizing plate 146, And can absorb polarized light that is not reflected through the polarizer. Here, the reflection type polarizing plate 146 reflects one polarized light and passes the other polarized light, which can not be completely reflected by the one polarized light to be reflected, and thus can be used to completely absorb it.

The absorption type polarizing plate 148 can prevent the ambient light from being reflected by the reflection type polarizing plate 146. The ambient light becomes polarized through the absorption type polarizing plate 148 and is absorbed by the absorption type polarizing plate 148 Passes through the reflection type polarizing plate 146, passes through the second phase delay plate 144 once, passes through the concave mirror 142 and is half reflected, and the reflected light passes through the second phase delay plate 144 , The phase of the polarized light is converted by the quarter wavelength (90 ° rotation) and blocked by the reflection type polarizing plate 146 and the absorption type polarizing plate 148, so that the object along the ambient light is reflected by the reflection type polarizing plate 146 It is possible to prevent the observer's face from being reflected.

The panel member 120 displaying an image according to the configuration including the backlight member 110, the panel member 120, the diffusion member 130, and the enlargement member 140 as described above and the corresponding optical action, So that an enlarged virtual image corresponding to the image can be seen in the observer's view.

In the image enlarging apparatus 100 according to the embodiment described above, the image of the panel member 120 is projected onto the diffusion member 130 by the point light source, As shown in FIGS. 2c and 2c, a slight distortion occurs when the distortion of the image of the panel member 120 is reversed.

For example, FIGS. 3A to 3D are views for explaining the inverse distortion of the image of the panel member 120 according to an embodiment of the present invention. In the panel member 120, When a normal image is displayed, this normal image is slightly distorted as shown in FIG. 3B through the diffusing member 1340. In order to correct this distortion, the image of the panel member 120 is formed as shown in FIG. 3C If it is distorted inversely, it can be outputted as a normal image as shown in FIG. 3D.

Here, the diffraction phenomenon may occur while the light passes through the panel member 120 and reaches the diffusion member 130. However, since the distance between the panel member 120 and the diffusion member 130 is very close, And the viewing angle of the image magnifying apparatus 100 as described above can be realized up to about 84 상 in the up, down, left, and right directions.

Therefore, in one embodiment of the present invention, after the point light source is emitted as circularly polarized light and the image positioned on the front side thereof is diffused, a diffused virtual image corresponding to the image is emitted through the concave mirror, the phase delay plate and the reflection- So that a small image can be greatly enlarged even with a simple configuration.

Next, an image enlarging apparatus according to another embodiment capable of enlarging an image using the above-described principle will be described.

4A to 4D are views for explaining an image enlarging apparatus according to another embodiment of the present invention.

4A to 4D, an image magnifying apparatus 200 according to another embodiment of the present invention may include an image outputting member 210, an enlarging member 220, and the like.

The image output member 210 is mounted on the front surface of the display device and converts the phase of the image displayed through the display device to a curved image. The image output member 210 includes a first absorbing polarizer 212, a first phase delay plate 214, a convex lens 216, and the like.

The first phase delay plate 214 may be mounted on a front surface of an LCD panel or an OLED panel of a display device including a wireless terminal such as a smart phone, a mobile phone, etc., and may output a circularly polarized light by converting a phase of a quarter wavelength.

The convex lens 216 is a convex lens whose back surface is flat and which is convex in the light emitting direction (front direction) and which is provided on the front surface of the first phase delay plate 214 and has a curved surface image corresponding to the radius of curvature A curved surface image is formed as shown in Fig.

The first absorptive polarizer 212 may be disposed between the display device and the first retarder 214. The first absorptive polarizer 212 may further include a first absorptive polarizer 212, So that ambient light can be absorbed.

The relationship between the radius of curvature of one surface of the convex lens 216 and the radius of the image will be described with reference to FIG. 4B. A convex lens having a flat surface on one side and a curvature radius R on the other side is referred to as an LCD panel or an OLED panel The radius of curvature thereof is represented by the following Equation 1

Here, x ₀ , d, and d 'are shown and defined in FIG. 3B.

Thus, an image can be formed on a part of the spherical surface having the radius of curvature as shown in Equation (1). That is, the light can start in the direction of the radiation at this point on the spherical surface.

The result of the calculation of the points formed on the front of the actual LCD panel or the OLED panel and the result of the comparison of the spherical surfaces are as shown in FIG. 4C, and the two data are similar to each other so that they are almost indistinguishable It can not be distinguished by overlapping).

In addition, when an image seen from an LCD panel or an OLED panel is viewed as a virtual image, a slight distortion (barrel distortion) occurs. When an original LCD image is distorted in consideration of the distortion, The image due to the chromatic aberration generated by the convex lens 216 can be corrected inversely.

For example, as described with reference to FIGS. 3A to 3D, a normal image from the display device is slightly distorted through the convex lens 216. In order to correct the distortion, the center of the image of the display device is moved from the origin 0 , 0). If the absolute value of the x coordinate is larger, the larger the absolute value of the y coordinate is, the larger the absolute value of the y coordinate is increased.

The magnifying member 220 emits an enlarged virtual image corresponding to the image through the phase conversion, reflection and passage of light after passing and reflecting the light corresponding to the curved image. The magnifying member 220 includes a concave mirror 222, A plate 224, a reflection type polarizing plate 226, a second absorption type polarizing plate 228, and the like.

A thin glass substrate 227 may be provided between the reflection type polarizing plate 226 and the second absorption type polarizing plate 228 to support thin films.

The concave mirror 222 is mirror-coated with a semi-transparent film while being thinly made of transparent plastic, so that half of the light corresponding to the projected curved image can be reflected while passing through the half.

Thereafter, the concave mirror 222 can reflect the half of the light passing through the second phase delay plate 224, which will be described later, while passing the light in the half direction and back direction.

The concave mirror 222 and the convex lens 216 may be arranged so that the convex spherical surfaces face each other.

The second phase delay plate 224 is disposed perpendicularly to the first phase delay plate 214 provided in the image output member 210 and provided in the front direction of the concave mirror 222 in the light output direction, It is possible to convert the phase by four wavelengths to convert the circular polarized light into linear polarized light and output it.

Thereafter, the second phase delay plate 224 transmits the light reflected through the reflection type polarizing plate 226, which will be described later, to the concave mirror 222, It is possible to transmit linearly polarized light obtained by converting the phase as much as the wavelength to the reflection type polarizing plate 226

The reflection type polarizing plate 226 is provided adjacent to the second phase delay plate 224 to reflect the linearly polarized light in one direction and to pass the linearly polarized light perpendicular thereto and to transmit the linearly polarized light from the second phase delay plate 224 Reflected by the second phase delay plate 224 can be reflected again.

Thereafter, the reflection type polarizing plate 226 can again emit an enlarged virtual image corresponding to the image while passing the light transmitted from the second phase delay plate 224.

The light passing through the process as described above can be seen in a virtual image corresponding to the position of the diffusion member 130 while converging near the field of view of the observer and the diffusion member 130 can be focused on the focal point of the concave mirror 142 The enlarged virtual image can be seen without being visible to the panel member 120 where the image starts.

The absorption type polarizing plate 228 may be disposed adjacent to the reflection type polarizing plate 226 and may include a reflection type polarizing plate 226. The reflection type polarizing plate 226 may include a second absorption type polarizing plate 228, To absorb the unpolarized polarization. Here, the reflection type polarizing plate 226 reflects one polarized light and passes the other polarized light, which can not be completely reflected by 100% of the one polarized light to be reflected, so that it can be used to completely absorb it.

The absorption type polarizing plate 228 can prevent the ambient light from being reflected by the reflection type polarizing plate 226. The ambient light is polarized through the absorption type polarizing plate 228 and is incident on the absorption type polarizing plate 228 Passes through the reflection type polarizing plate 226, passes through the second phase retardation plate 224 once, passes halfway through the concave mirror 222, is half reflected, and the reflected light passes through the second phase delay plate 224 The phase of the polarized light is converted by 1/4 wavelength (90 ° rotation) and blocked by the reflection type polarizing plate 226 and the absorption type polarizing plate 228 so that the object along the ambient light is reflected by the reflection type polarizing plate 226 It is possible to prevent the observer's face from being reflected.

A display device that displays an image in accordance with the configuration including the image output member 210 and the enlargement member 220 as described above and the corresponding optical action can display an enlarged virtual image corresponding to the image It can be seen in the observer's view.

Therefore, in another embodiment of the present invention, an image displayed through a display device is converted into a circularly polarized light, and is output as a curved image through a convex lens, and diffused light is emitted through a concave mirror, a phase delay plate, By emitting a virtual image, a small image can be greatly enlarged even with a simple configuration that can be detached and attached to a display device.

That is, according to another embodiment of the present invention, unlike the embodiment, there is no need to newly create a backlight, and although the angle of view is small, the angle of view of the image can be further enlarged when another lens is further mounted on the panel , The maximum angle when the refractive index of the lens is 1.48 is 25.7 ㅀ, and the maximum angle when the refractive index is 1.9 is 40.5 ㅀ. As a result, the angle of view The radius of curvature that maximizes the radius of curvature can be found.

For example, as shown in FIG. 3D, when two convex lenses are disposed in front of the LCD panel or the OLED panel of the smart phone, the image displayed on the LCD panel or the OLED panel is positioned at a position And this image is produced by the reflective polarizer 226 in the vicinity of the focal distance of the concave mirror 222 and the image again becomes a virtual image at a long distance, I will see.

In this case, when the refractive index of the lens is 1.48, the viewing angle is 40.3 상, and when the refractive index is 1.9, the viewing angle is 63.1 ㅀ. When the lens is further added, It can be seen that it can be expanded further.

On the other hand, in the above-described embodiment and other embodiments, the use of the translucent concave mirrors 142 and 222 can reduce the brightness of the light by a factor of four, which can be solved by adding a reflective circular polarizer have.

For example, the light incident on the concave mirror is a circularly polarized light. When a reflection type circularly polarized light polarizing plate is attached to the inside of the concave mirror instead of the mirror coating, circularly polarized light rotating in one direction is passed, After passing through the 1/4 wavelength phase retardation plate, the linearly polarized light is reflected, and again the circularly polarized light passes through the 1/4 wavelength phase retardation plate and has the rotation direction opposite to the original circularly polarized light.

The circularly polarized light is reflected by the reflective circular circular polarized light polarizing plate attached inside the concave mirror, and the reflected circularly polarized light again passes through the quarter-wave retardation plate to be linearly polarized light, and the light perpendicular to the first linearly polarized light And is allowed to pass through the reflection type polarizing plate, whereby the brightness of the light can be prevented from decreasing.

It is possible to provide a useful device that allows an observer to enlarge an image of a smart phone by using the image enlarging device as described above and to have a feeling of seeing a screen of a movie theater even with a simple configuration.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be readily apparent that such substitutions, modifications, and alterations are possible.

100, 200: image magnifying apparatus 110: backlight member
120: panel member 130: diffusion member
140, 220: Enlargement member 210: Image output member

Claims (11)

delete delete delete delete delete An image output member for converting a phase of an image displayed through the display device and outputting the converted image as a curved image,
And a magnifying member for emitting an enlarged virtual image corresponding to the image through the phase conversion, reflection and passage of the light after passing and reflecting light corresponding to the curved image,
Wherein the image output member comprises:
A first phase delay plate mounted on a front surface of the display device for converting a phase of 1/4 wavelength and outputting the circularly polarized light,
And a convex lens provided on a front surface of the first phase delay plate and emitting the curved surface image corresponding to a radius of curvature,
The enlarged member
The half mirror reflects the light corresponding to the curved surface image through the semi-transparent concave mirror and reflects the half of the light through the second phase retardation plate provided on the concave mirror in the light output direction And the light is reflected through a reflection type polarizing plate provided adjacent to the second phase delay plate, passes through the second phase delay plate and passes halfway through the concave mirror And a phase shifter for shifting the phase by a quarter wavelength through the second phase delay plate to emit an enlarged virtual image corresponding to the image while passing through the reflective polarizer.
delete The method according to claim 6,
Wherein the image output member comprises:
A first absorption type polarizing plate provided between the display device and the first phase delay plate and absorbing ambient light;
Wherein the image enlarging device further comprises:
delete The method according to claim 6,
The enlarged member
A second absorption type polarizing plate disposed adjacent to the reflection type polarizing plate and absorbing polarized light not reflected through the reflection type polarizing plate,
Wherein the image enlarging device further comprises:
11. A method according to any one of claims 6, 8 and 10,
Wherein the convex lens and the convex spherical surface of the concave mirror face each other.

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