KR100945136B1 - Projector and mobile communication terminal there with - Google Patents

Abstract

A small projector and a mobile communication terminal having the same are provided. A small projector according to the present invention is a projector capable of projecting a screen of a resolution provided by a mobile communication terminal, comprising: a light source unit, a wave guide for shaping and applying light from the light source unit to an optical modulator unit, and a predetermined form from a wave guide. A light modulator unit for forming an image by controlling the degree of transmission or reflection of light by using the molded light, and a projection lens system for enlarging and projecting the image light passing through the light modulator unit onto an external screen. It is characterized in that it has a length that is incident into the wave guide can be reflected at least three times, the diffuser is installed in the wave guide.

Projection, projector, wave guide

Description

Small projector and mobile communication terminal having the same {Projector and mobile communication terminal there with}

In detail, the present invention relates to a small projector having a reduced volume by minimizing the number of optical elements and a mobile communication terminal having the same.

The small projector should be minimized in volume to a structure suitable for being embedded or mounted in the mobile communication terminal, and the present invention relates to a technique for minimizing the volume of the small projector.

Today's mobile phones are accelerating high functionality and complexity in addition to the basic features of voice calls.

In recent years, mobile phones have been increasingly used to process multimedia data in addition to wireless communication functions, and process various functions such as cameras, TV receivers, satellite broadcast receivers, and games to process the multimedia data. It is loaded with programs, and these mobile phones are increasingly becoming multifunctional terminals.

The various functions are provided with the image of the corresponding function on the display screen of the conventional portable terminal and provides audio along with the image.

For example, a user selects a broadcast of a TV channel through a conventional portable terminal, receives an image of the selected TV channel through a display screen of the portable terminal, and simultaneously connects the built-in speaker of the portable terminal or an earphone to the portable terminal. Audio is provided through.

In the conventional mobile terminal, since a display screen displaying an image is limited, there is a problem in that an image executed through the mobile terminal can only be provided to a user through a limited display screen of the mobile terminal.

In order to solve such a problem, a technology for miniaturizing a projector to be provided in a portable terminal to display a larger image has been developed.

12 is a block diagram showing a compact projector according to the prior art.

The conventional compact projector uses the light sources 110, 120, and 130 of R, G, and B, respectively, as shown in FIG. 12, and collects the light emitted from each color light source by using the condenser lenses 211, 212, and 213. Is synthesized on the same optical axis using a color synthesis system including dichroic mirrors 221, 222, and 223.

The synthesized light of the Gaussian beam profile is formed into the illumination light of the top hat profile using the beam shaper 230 and then sent to the light modulator 300 to form an image. The image light passing through the optical modulator 300 is projected to the screen through the projection lens 250.

 However, such a conventional small projector requires an optical element including various lenses, both an illumination system in front of the beam shaper and an imaging system in the rear of the beam shaper 230, and thus each optical part has a certain amount of light. It is accompanied by losses and, consequently, as the light path becomes longer, the light efficiency decreases. However, if there is no beam shaper 230 such as a fly's eye lens, the uniformity of the light incident on the optical modulator 300 is not good, and thus the image quality is not good as a whole. In order to send to the optical modulator 300, the existence of various optical elements has been inevitable.

Therefore, in developing a small projector having a minimum volume to be embedded in a mobile communication terminal, there is a need for a method of minimizing the number of optical elements.

The present invention is to solve all the disadvantages and problems of the prior art as described above, the technical problem to be achieved by the present invention, the number of optical elements can be reduced, the volume is minimized, the structure is suitable for embedding in a mobile communication terminal It is to provide a small projector and a mobile communication terminal having the same.

Another object of the present invention is to provide a compact projector having a small volume and a mobile communication terminal having the same in a structure suitable for being embedded or mounted in a mobile communication terminal having a thin and long form.

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

A small projector according to the present invention for achieving the above object is a projector capable of projecting a screen of a resolution provided by a mobile communication terminal, a light source unit, and a wave guide for shaping and applying light from the light source unit to the optical modulator unit; And a light modulator unit for forming an image by adjusting the degree of transmission or reflection of light by using the light molded in a predetermined shape from the wave guide, and a projection to enlarge and project the image light passing through the light modulator unit onto an external screen. It includes a lens system, wherein the wave guide is characterized in that the light has a length that can be reflected inside the wave guide at least three times.

Here, the wave guide is in surface contact with one end surface of the light source unit, and one end of the wave guide is in surface contact with one surface of the optical modulator unit.

In addition, the wave guide has a long rod shape, the longitudinal direction of the wave guide may be at least twice the size of the width of the cross section of the wave guide.

In this case, the cross section of the wave guide is preferably a square.

The optical modulator may be a field sequential optical modulator.

In addition, the optical modulator may include a liquid crystal display.

In addition, the light source unit may include a laser light source.

In addition, the light source unit may include a light emitting diode (LED) light source.

On the other hand, the wave guide is preferably a hollow inside made of a reflective surface.

In this case, a diffuser may be installed inside the wave guide.

In addition, the optical modulator may include an elcos (LCOS) or a DMD (DMD).

In this case, a beam splitter may be further included between the wave guide and the optical modulator.

The optical modulator may be a reflective optical modulator, and further include a polarization separator in the wave guide.

Here, the phase difference plate for changing the phase of the image light between the light emitting portion of the wave guide and the projection lens system may be further included.

In addition, the wave guide has a hollow inside having a reflective surface, and a diffuser may be installed inside the wave guide.

The optical modulator may be a projection optical modulator, and may further include a phase difference plate for changing a phase of image light between the optical modulator unit and the projection lens system.

Here, the wave guide has a hollow inside having a reflective surface, and a diffuser may be installed inside the wave guide.

A mobile communication terminal according to the present invention for achieving the above object is a mobile communication terminal having a projector capable of projecting a screen of the resolution provided by the mobile communication terminal, which is responsible for wireless transmission and reception of voice calls and data communications, etc. And a communication unit, a memory for downloading and storing multimedia data including a video signal, a projector displaying the multimedia data, and an interface unit for communication between the projector and the mobile communication terminal, wherein the projector includes: a light source unit; A wave guide for shaping the light from the light source unit and applying the light to the optical modulator unit, an optical modulator unit for forming an image by adjusting the degree of light transmission using light formed in a predetermined form from the wave guide, and the optical modulator unit Zoom in on one image light Of a projection lens system for projecting to the screen, and wherein the guide-way bracket is characterized by having a length that is the light incident on the inside of the waveguide may be reflected at least three times.

Here, the projector may be a portable form detachable to the mobile communication terminal.

In addition, the projector may be embedded in the mobile communication terminal.

The compact projector of the present invention employs a wave guide to reduce the number of optical elements, thereby minimizing the volume to a structure suitable for embedding in a mobile communication terminal.

In addition, the compact projector of the present invention can be minimized in a structure suitable for embedding or mounting in a mobile communication terminal having a thin and long form.

Details of the above object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

First, Figure 1 is a block diagram of a mobile communication terminal having a small projector of the present invention.

As shown in FIG. 1, the mobile communication terminal 10 including the small projector according to the present invention is a mobile communication terminal having a small projector capable of projecting a screen having a resolution provided by the mobile communication terminal. Controls the communication unit 13 in charge of wireless transmission and reception such as voice call and data communication, a memory 12 for downloading and storing multimedia data including a video signal, and various operations for receiving, storing and managing the multimedia data. And a control unit 11, a small projector 14 as a display device for displaying the multimedia data, and an interface unit 15 for communication between the small projector 14 and a mobile communication terminal.

Here, the small projector 14 may be embedded in a portable form or a form embedded in the mobile communication terminal 10.

Hereinafter, a detailed configuration of a small projector according to embodiments of the present invention will be described in detail.

First, with reference to FIG. 2, the configuration of the small projector according to the first embodiment of the present invention will be described in detail.

2 is a block diagram of a compact projector according to a first embodiment of the present invention.

As shown in FIG. 2, the small projector 14 is a projector capable of projecting a screen having a resolution provided by the mobile communication terminal 10, and is detachable that can be mounted and used in a portable medium such as a mobile communication terminal. Is a portable projector or a small projector that can be embedded in the mobile communication terminal embedded.

The compact projector includes a light source unit 101, a wave guide 201 for shaping the light from the light source unit 101 into a predetermined form and applying it to the optical modulator unit 301, and the wave guide 201. The light modulator 301 for forming an image by controlling the degree of transmission of the light using the light formed in the form of a shape of the light, and to enlarge the image light passing through the light modulator 301 to be projected to an external screen. It is configured to include a projection lens system 401.

The light source unit 101 is configured to sequentially emit color light of each of R, G, and B, and a laser light source or a light emitting diode (LED) light source may be employed.

Light of a small beam size, such as the LED or laser, is formed into rectangular top hat beam profile light while passing through the wave guide 201.

The wave guide 201 has an elongated rod shape in which one side is in surface contact with the light source unit 101, and the light emitted from the light source unit 101 passes through one side of the wave guide 201 in contact with the surface. The incident light is incident on the wave guide 201 and the incident light is reflected at least three times and is emitted toward the other side opposite to the one side.

The emitted light is incident on the optical modulator unit 301 which is in surface contact with the exit port side. The image light passing through the optical modulator 301 is projected to the projection lens system 401.

In order to use the wave guide 201 as an integrator element, the present invention maintains a length at which light incident therein can be reflected three or more times.

This length may be reduced in proportion to the reduction in the cross section of the wave guide 201.

Therefore, the light emitted as close as possible to the light source is not diffused and designed to be incident on the wave guide 201 with a small beam size like the LED or the laser light source. The length of the wave guide 201 may be shortened.

The wave guide 201 reflected three or more times serves as a beam shaping as an integrator, and the light incident portion of the wave guide 201, which is a beam shaper, and the light output to the optical modulator 301 for light efficiency. If the parts are configured as close as possible, the light efficiency can be further increased.

Therefore, it is preferable that the cross section of the wave guide 201 is rectangular in order to increase the light efficiency, and the length direction of the wave guide 201 is preferably at least twice as large as the width of the cross section of the wave guide. .

Here, the integrator is a rod integrator that makes light uniform.

Meanwhile, the optical modulator 301 may be configured as a liquid crystal display. When an electrical signal corresponding to an image to be obtained is selectively applied to a plurality of electrodes to drive the liquid crystal, the optical modulator 301 may be filled on the selected electrode. The orientation of the liquid crystal is changed to control the degree of transmission of the light emitted from the wave guide 201 to generate an image.

The liquid crystal display of the optical modulator 301 may be a single plate field sequential liquid crystal display.

Here, the single-plate field sequential liquid crystal display device refers to a liquid crystal display device which displays color images with one liquid crystal panel by sequentially emitting each color light.

In addition, the projection lens system 401 is an aggregate of several lenses.

Therefore, according to the first embodiment of the present invention, the mobile communication terminal of the present invention is realized by adopting a wave guide to the small projector of the present invention and reducing other optical elements, focusing on the fact that the laser or LED light has a small beam size. It can be a structure suitable for embedded in the (Embedded).

In addition, since the small projector of the present invention has a small overall volume and a long rod shape, the small projector of the present invention may be a structure suitable for adopting a mobile communication terminal having a thin and long form.

Next, modified embodiments of the small projector according to the first embodiment of the present invention will be described with reference to FIGS. 3 and 4.

3 is a configuration diagram of a modified embodiment of the small projector according to the first embodiment of the present invention, and FIG. 4 is a configuration diagram of another modified embodiment of the small projector according to the first embodiment of the present invention.

3 and 4 are all the same as the first embodiment of the present invention except for the positions of the optical modulator unit and the projection lens system, and a detailed description thereof will be omitted.

According to modified embodiments of the present invention as shown in Figures 3 and 4, the

As embodiments in which the positions of the optical modulator 301 and the projection lens system 401 are changed, the emission position of the light from the wave guide 201 depends on the positions of the optical modulator 301 and the projection lens system 401. It can be seen that it will be different.

In addition, the structure of the small projector according to the present invention is not limited to the above embodiments, and if the wave guide 201 structure of the present invention is adopted, the form may be variously modified.

Modified embodiments of the present invention have the same effect as the first embodiment of the present invention described above.

Next, with reference to FIG. 5, the configuration of a small projector according to a second embodiment of the present invention will be described in detail.

5 is a configuration diagram of a compact projector according to a second embodiment of the present invention.

As shown in FIG. 5, the small projector 14 is a projector capable of projecting a screen having a resolution provided by the mobile communication terminal 10. The small projector 14 may be attached to a portable medium such as a mobile communication terminal. It is a portable projector possible or a small projector which can be embedded in the mobile communication terminal.

The compact projector includes a light source unit 102, a wave guide 202 for shaping the light from the light source unit 102 into a predetermined form and applying it to the optical modulator unit 302, and the wave guide 202 from the wave guide 202. The optical modulator 302 for forming an image by adjusting the degree of transmission of the light by using the shaped light in the form of a shape of the light, and to enlarge the image light passing through the optical modulator 302 to be projected onto an external screen. And a projection lens system 402.

The light source unit 102 is configured to sequentially emit color light of each of R, G, and B, and a laser light source or a light emitting diode (LED) light source may be employed.

Light of a small beam size, such as the LED or laser, is shaped into rectangular top hat beam profile light as it passes through the wave guide 202.

The wave guide 202 has a long rod shape, one side of which is in surface contact with the light source unit 102, and the light emitted from the light source unit 102 passes through the one side of the wave guide 202 which is in surface contact. The incident light is incident into the guide 202, and the incident light is reflected at least three times and is emitted toward the other side opposite to the one side.

In addition, according to the second embodiment of the present invention, the wave guide 202 employs a hollow type instead of a solid element, and by forming an inner surface of the wave guide, a beam shaping effect such as a solid type can be seen. Is characteristic.

In addition, a diffuser 502 is installed inside the wave guide 202.

In this case, the diffuser 502 is disposed in the wave guide 202 perpendicular to the optical axis.

The diffuser 502 is a device for reducing such coherence because the coherence of the laser is large when the light source is used as a laser. The diffuser 502 is installed on the optical path in the hollow waveguide 202. It is.

The emitted light is incident on the optical modulator portion 302 which is in surface contact with the exit port side. The image light passing through the optical modulator unit 302 is enlarged and projected onto the projection lens system 402.

Meanwhile, the optical modulator 300 may be configured as a liquid crystal display. When an electrical signal corresponding to an image to be obtained is selectively applied to a plurality of electrodes to drive the liquid crystal, the optical modulator 300 is filled on the selected electrode. The orientation of the liquid crystal is changed to control the degree of transmission of light emitted from the wave guide 202 to generate an image.

The liquid crystal display of the optical modulator 302 may be a single plate field sequential liquid crystal display.

Here, the single-plate field sequential liquid crystal display device refers to a liquid crystal display device to display the color image with one liquid crystal panel so that each color light is sequentially emitted.

In addition, the projection lens system 402 is an aggregate of several lenses.

Therefore, according to the second embodiment of the present invention, the mobile communication terminal of the present invention is realized by employing a wave guide in the small projector of the present invention and reducing other optical elements, focusing on the fact that the laser or LED light has a small beam size. It can be a structure suitable for embedded in the (Embedded).

In addition, since the small projector of the present invention has a small overall volume and a long rod shape, the small projector of the present invention may be a structure suitable for adopting a mobile communication terminal having a thin and long form.

In addition, by installing a diffuser in the wave guide, it is possible to reduce the coherence of the laser.

Next, the configuration of the small projector according to the third embodiment of the present invention will be described in detail with reference to FIG. 6.

6 is a configuration diagram of a compact projector according to a third embodiment of the present invention.

As shown in FIG. 6, the small projector according to the third embodiment of the present invention forms a light source unit 103 and a wave guide for forming light from the light source unit 103 in a predetermined shape and applying the light to the beam splitter 603. 203, a beam splitter 603 disposed in surface contact with the other lower surface of the wave guide 203, and an amount of reflection of light reflected downward from the beam splitter 603 is adjusted to form an image. A projection lens system configured to magnify an image light passing through the beam splitter 603 to the external screen by reflecting light from the optical modulator unit 303 and the optical modulator unit 303 and having a phase change. 403).

The beam splitter 603 is in surface contact with the other lower surface of the wave guide 203 and is disposed between the wave guide 203 and the optical modulator 303.

In addition, the projection lens system 403 is disposed on one side of the beam splitter 603.

The compact projector according to the third embodiment of the present invention may include the optical modulator 303 as a reflective optical modulator such as a liquid crystal on silicon (LCOS) or a digital micro-mirror display (DMD).

When using a reflective optical modulator such as DMD or LCOS, a beam splitter 603 is added between the wave guide 203 and the optical modulator 303.

Specifically, when the reflective optical modulator is employed as the modulator 303, the beam splitter 603 is disposed in front of the reflective optical modulator.

Here, the beam splitter 603 is a structure having a polarization separator in the glass body of the cube. When light is incident from the side, only the P wave or the S wave passes through the polarization separator and the rest is reflected. Likewise, the light reflected downward from the beam splitter 603 is changed in phase as reflection occurs in the reflective optical modulator 303, and the light having the changed phase can pass through the beam splitter 603. It is a structure.

Here, the LCOS is a display in which a lower glass is replaced with a silicon wafer in a conventional liquid crystal display (LCD) device and a circuit is formed thereon.

In addition, DMD (Digital Micromirror Display) is an advanced technique that realizes high-definition images by using light reflecting elements, and selectively reflects light using a device integrating hundreds of thousands of reflective elements on one chip. It is a technology to express high resolution images.

Therefore, according to the third embodiment of the present invention, the mobile communication terminal of the present invention can be realized by employing a wave guide in the small projector of the present invention and reducing other optical elements in view of the fact that the laser or LED light has a small beam size. It can be a structure suitable for embedded in the (Embedded).

In addition, since the small projector of the present invention has a small overall volume and a long rod shape, the small projector of the present invention may be a structure suitable for adopting a mobile communication terminal having a thin and long form.

It can also be applied when employing a reflective optical modulator.

Next, the configuration of the small projector according to the fourth embodiment of the present invention will be described in detail with reference to FIG. 7.

7 is a configuration diagram of a compact projector according to a fourth embodiment of the present invention.

As shown in FIG. 7, the compact projector according to the fourth embodiment of the present invention

Since all configurations except for the configuration using the reflective optical modulator 304 and the polarization splitting film 604 are the same as those of the second embodiment of the present invention, a detailed description thereof will be omitted.

In the small projector according to the fourth embodiment of the present invention, the optical modulator unit 304 may employ a reflective optical modulator such as a liquid crystal on silicon (LCOS) or a digital micro-mirror display (DMD).

The reflective optical modulator 304 is in surface contact with the other lower surface of the wave guide 204, and a polarization separator 604 is disposed in the wave guide 204 instead of a general mirror.

In addition, a projection lens system 404 is disposed on the other upper surface of the wave guide 204.

Here, the LCOS is a display in which a lower glass is replaced with a silicon wafer in a conventional liquid crystal display (LCD) device and a circuit is formed thereon.

In addition, DMD (Digital Micromirror Display) is an advanced technique that realizes high-definition images by using light reflecting elements, and selectively reflects light using a device integrating hundreds of thousands of reflective elements on one chip. It is a technology to express high resolution images.

Accordingly, according to the fourth embodiment of the present invention, the mobile communication terminal of the present invention can be adopted by employing a wave guide in the small projector of the present invention and reducing other optical elements in view of the fact that the laser or LED light has a small beam size. It can be a structure suitable for embedded in the (Embedded).

In addition, since the small projector of the present invention has a small overall volume and a long rod shape, most of the small projectors may have a structure suitable for adoption in a mobile communication terminal having a thin and long form.

It can also be applied when employing a reflective optical modulator.

Next, a configuration of a compact projector according to a fifth embodiment of the present invention will be described in detail with reference to FIG. 8.

8 is a configuration diagram of a compact projector according to a fifth embodiment of the present invention.

As shown in FIG. 8, the small projector 14 according to the fifth embodiment of the present invention is a projector capable of projecting a screen having a resolution provided by the mobile communication terminal 10, and is a portable medium such as a mobile communication terminal. A portable projector that can be mounted and used on a back, or a small projector that can be embedded and embedded in the mobile communication terminal.

The compact projector includes a light source unit 105, a wave guide 205 for shaping light from the light source unit 105 into a predetermined shape and applying it to the reflective optical modulator unit 305, and the wave guide 205. The reflective optical modulator unit 305 for forming an image by adjusting the degree of reflection of the light using light molded in a predetermined form from the light guide; and the reflective optical modulator unit 305 disposed in the wave guide 305. ) To enlarge the polarization separator 605, the phase difference plate 705 for changing the phase of the image light, and the image light passing through the reflective optical modulator 305 to be projected onto an external screen. And a projection lens system 405.

The light source unit 105 is configured to sequentially emit color light of each of R, G, and B, and a laser light source may be employed.

Light of a small beam size, such as the laser, is formed into rectangular top hat beam profile light while passing through the wave guide 205.

The wave guide 205 has a long rod shape in which one side is in surface contact with the light source unit 105, and the light emitted from the light source unit 105 passes through the one side of the wave guide 205 in contact with the surface. The incident light is incident on the guide 205 and the incident light is reflected at least three times and is emitted toward the other side opposite to the one side.

The emitted light is reflected through the reflective optical modulator 305 which is in surface contact with the lower end of the exit port, and the image light reflected from the reflective optical modulator 305 is passed through the polarization separation layer 605 to the projection lens system 405. To zoom in.

The present invention maintains a length at which light incident therein can be reflected three or more times so that the wave guide 205 can be used as an integrator element.

This length may be reduced in proportion to the reduction in the cross section of the wave guide 205.

Therefore, the light emitted as close as possible to the light source is not diffused and is designed to be incident on the wave guide 205 with a small beam size like the laser light source, so that the wave guide having a small cross section can be adopted. 205 can be reduced in length.

The wave guide 205 reflecting three or more times serves as a beam shaping as an integrator, and the incident portion of the light to the wave guide 205 which is a beam shaper for the light efficiency and the reflective light modulator 305. If the light exit portion is configured as closely as possible can further increase the light efficiency.

Therefore, the cross section of the wave guide 205 is preferably a quadrangle so that the light efficiency is increased, and the length direction of the wave guide 205 is preferably at least twice as large as the width of the cross section of the wave guide. .

Here, the integrator is a rod integrator that makes light uniform.

The reflective optical modulator 305 may be configured as a liquid crystal display, and when an electrical signal corresponding to an image to be obtained is selectively applied to a plurality of electrodes to drive a liquid crystal, the reflective optical modulator 305 may be disposed on the selected electrode. The orientation of the filled liquid crystal is changed to control the degree of reflection of light emitted from the wave guide 205 to generate an image.

In addition, the retardation plate 705 is installed between the wave guide 205 and the projection lens system 405, and is connected to an external drive unit (motor, etc.) to perform linear or circular motion in a direction perpendicular to the optical axis of the image light. It is configured to be.

Meanwhile, when the light source unit 105 is used as a laser, various methods may be employed as a method for reducing such coherence because of coherence of the laser light.

As a method for reducing the coherence of the laser light, any one of the incident angle change, the wavelength change, and the phase change of the light may be used.

The role of reducing the coherence characteristic by changing the incident angle of the light may be performed by the above-described diffuser, and the wavelength change may reduce the coherence characteristic by changing the wavelength of the light source to a minute difference.

The rotating retardation plate 705 may reduce coherence by randomly changing the phase of the light beam.

´위상차판(705)을 광축에 수직한 방향으로 움직임으로써 통과하는 광빔의 위상을 변화시킬 수 있다. Specifically, '1/2

The phase of the light beam passing through can be changed by moving the phase difference plate 705 in a direction perpendicular to the optical axis.

However, since the polarization of light beams passing through the rotating retardation plate 705 changes in real time, when the optical modulator 305 is a liquid crystal display device, when the retardation plate 705 is positioned in front of the liquid crystal panel, the light beam passes through the panel. Since the phenomenon that the brightness of one light continues to change occurs, when the liquid crystal display device is used as the optical modulator 305, it is preferable to position the retardation plate 705 at the rear end of the optical modulator 305 on the optical axis.

In addition, the projection lens system 405 is a collection of several lenses.

Therefore, according to the fifth embodiment of the present invention, the laser light is embedded in the mobile communication terminal of the present invention by adopting a wave guide to the small projector of the present invention and reducing other optical elements in view of having a small beam size. (Embedded) It may be a structure suitable for the following.

In addition, since the small projector of the present invention has a small overall volume and a long rod shape, the small projector of the present invention may be a structure suitable for adopting a mobile communication terminal having a thin and long form.

In addition, by installing the retardation plate, it is possible to reduce the coherence of the laser.

Next, modified embodiments of the small projector according to the fifth embodiment of the present invention will be described with reference to FIGS. 9 through 11.

9 is a configuration diagram of a modified embodiment of the small projector according to the fifth embodiment of the present invention, FIG. 10 is a configuration diagram of another modified embodiment of the small projector according to the fifth embodiment of the present invention, and FIG. 4 is a configuration diagram of another modified embodiment of the compact projector according to the fifth embodiment of FIG.

9 to 11 have the same configuration as that of the fifth embodiment of the present invention except that the optical modulator unit and the diffuser are installed, and a detailed description thereof will be omitted.

As shown in FIG. 9, the modified embodiment of the compact projector according to the fifth embodiment of the present invention has a structure in which a diffuser 505 is added to further reduce the coherence characteristic of the laser light.

In addition, the wave guide 205 employs a hollow type instead of a full-size device. The wave guide 205 has a beam shaping effect such as a solid type by forming an inner surface of the wave guide.

In this case, the diffuser 505 is disposed perpendicular to the optical axis inside the wave guide 205.

In addition, as shown in FIG. 10, another modified embodiment of the compact projector according to the fifth embodiment of the present invention is a projection light modulator unit 306 instead of the reflective light modulator unit 305 shown in FIG. 8. ) Was adopted.

Accordingly, the projection type optical modulator 306 is in surface contact with the upper surface of the other side of the wave guide 205, and a phase difference plate 705 is provided thereon.

Detailed description of the retardation plate 705 has been described above.

In addition, as shown in FIG. 11, another modified embodiment of the small projector according to the fifth embodiment of the present invention includes a diffuser (a diffuser) in the structure of the small projector employing the projection type optical modulator unit 306 shown in FIG. 10. 505) is added.

Detailed description of the diffuser 505 has been described above.

Modified embodiments of the present invention have the same effect as the fifth embodiment of the present invention described above.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

The present invention described above may be applied to a mobile communication terminal having a projector, and specifically, may be applied to a small projector having a size suitable for detachable or embedded in the mobile communication terminal and a mobile communication terminal having the same.

1 is a configuration diagram of a mobile communication terminal including a small projector of the present invention.

2 is a block diagram of a compact projector according to a first embodiment of the present invention.

3 is a configuration diagram of a modified embodiment of the compact projector according to the first embodiment of the present invention.

4 is a configuration diagram of another modified embodiment of the compact projector according to the first embodiment of the present invention.

5 is a configuration diagram of a compact projector according to a second embodiment of the present invention.

6 is a configuration diagram of a compact projector according to a third embodiment of the present invention.

7 is a configuration diagram of a compact projector according to a fourth embodiment of the present invention.

8 is a configuration diagram of a compact projector according to a fifth embodiment of the present invention.

9 is a configuration diagram of a modified embodiment of the compact projector according to the fifth embodiment of the present invention.

10 is a configuration diagram of another modified embodiment of the compact projector according to the fifth embodiment of the present invention.

11 is a configuration diagram of still another modified embodiment of the compact projector according to the fifth embodiment of the present invention.

12 is a block diagram showing a compact projector according to the prior art.

<Description of Symbols for Main Parts of Drawings>

101: light source 201: wave guide

301: optical modulator 401: projection lens system

502: diffuser 603: beam splitter

Claims (25)

A projector capable of projecting a screen of a resolution provided by a mobile communication terminal, A light source unit; A wave guide shaping the light from the light source unit and applying the light to the optical modulator unit; An optical modulator unit configured to form an image by adjusting a degree of transmission or reflection of light formed into a predetermined shape from the wave guide; And And a projection lens system for enlarging and projecting image light passing through the optical modulator to an external screen. The wave guide has a length that the light is incident to the inside of the wave guide can be reflected at least three times, Small projector, characterized in that the diffuser is installed inside the wave guide. In claim 1, The wave guide, A small projector, characterized in that the one end is in surface contact with one end surface of the light source unit, and the other end of the wave guide is in surface contact with one surface of the optical modulator unit. In claim 1, The wave guide, The projector is rod-shaped, wherein the length direction of the wave guide is at least twice as large as the width of the cross section of the wave guide. In claim 2, Miniature projector, characterized in that the cross section of the wave guide is a square. In claim 1, And said optical modulator portion is a field sequential optical modulator. In claim 1, The optical modulator unit, Small projector comprising a liquid crystal display device. In claim 1, The light source unit, A compact projector comprising a laser light source. In claim 1, The light source unit, A compact projector comprising a light emitting diode (LED) light source. In claim 1, The wave guide is a small projector, characterized in that the hollow interior consisting of a reflective surface. delete In claim 1, The optical modulator unit Small projector comprising Elcos (LCOS) or DMD (DMD). In claim 11, And a beam splitter between the wave guide and the optical modulator unit. In claim 1, The optical modulator portion is a reflective optical modulator, Small projector further comprises a polarization separator in the wave guide. In claim 13, And a phase difference plate for changing the phase of the image light between the light exit portion of the wave guide and the projection lens system. The method of claim 14, The wave guide is a small projector, characterized in that the hollow interior consisting of a reflective surface. In claim 1, The optical modulator unit is a projection optical modulator, And a retardation plate for changing a phase of image light between the optical modulator unit and the projection lens system. The method of claim 16, The wave guide is a small projector, characterized in that the hollow interior consisting of a reflective surface. A mobile communication terminal having a projector capable of projecting a screen of a resolution provided by a mobile communication terminal, Communication unit for wireless transmission and reception, such as voice call and data communication; A memory for downloading and storing multimedia data including a video signal; A projector for displaying the multimedia data; And An interface unit for communication between the projector and the mobile communication terminal, The projector, A light source unit; A wave guide shaping the light from the light source unit and applying the light to the optical modulator unit; An optical modulator unit configured to form an image by adjusting a degree of transmission or reflection of light formed into a predetermined shape from the wave guide; And a projection lens system for enlarging and projecting image light passing through the optical modulator to an external screen. The wave guide has a length that the light is incident to the inside of the wave guide can be reflected at least three times, A mobile communication terminal, characterized in that a diffuser is installed inside the wave guide. The method of claim 18, The projector, A mobile communication terminal, characterized in that the portable form detachable to the mobile communication terminal. The method of claim 18, The projector, And a mobile communication terminal embedded in the mobile communication terminal. The method of claim 18, The optical modulator portion is a reflective optical modulator, The mobile communication terminal further comprises a polarization separator in the wave guide. The method of claim 21, And a phase difference plate for changing the phase of the image light between the light emitting portion of the wave guide and the projection lens system. The method of claim 22, The wave guide is a mobile communication terminal, characterized in that the hollow interior consisting of a reflective surface. The method of claim 18, The optical modulator unit is a projection optical modulator, And a phase difference plate for changing a phase of image light between the optical modulator unit and the projection lens system. The method of claim 24, The wave guide is a mobile communication terminal, characterized in that the hollow interior consisting of a reflective surface.

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