KR100920636B1 - 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, and is formed by applying a light source and light from the light source to an optical modulator unit and projecting image light passing through the optical modulator unit. And an optical modulator for projecting through the lens system and an optical modulator for adjusting an intensity of light using light formed from the optical processor to form an image. The projection lens system is designed to give an offset, and is designed to give an optical modulator front end. A lens located at may be configured to decenter vertically on the central optical axis.

Projection, Projector, Optical Modulator, Offset, Decenter

Description

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

The present invention relates to a small projector and a mobile communication terminal having the same, and more particularly, to a small projector having an increased light efficiency and a mobile communication terminal having the same.

The present invention relates to a technique for minimizing optical loss of optical elements such that the small projector is mounted in a mobile communication terminal so that the projector can have sufficient brightness to perform a projector function.

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.

Conventional projectors separate bright white light into red, blue, and green colors, and transmit the color light to each color-specific liquid crystal panel corresponding to each color to form an image of each color, and then synthesize the color image again. Was formed.

However, in order to reduce the size of the projector, it is necessary to remove a color separation system and use a light source that emits each color light. Such color light includes laser and LED. These light sources emit significantly brighter light than their power consumption and size, but they may not be bright enough to function as projectors.

This is because the amount of light lost is considerable because the efficiency of various optical elements is not 100%.

Therefore, in developing a compact projector having a minimum volume to be embedded in a mobile communication terminal, there is a need for a method of increasing optical efficiency of optical elements.

Accordingly, the present invention is to solve the above-mentioned disadvantages and problems of the prior art, the technical problem to be achieved by the present invention, to provide a small projector with increased light efficiency and a mobile communication terminal having the same.

Another object of the present invention is to provide a small projector and a mobile communication terminal having the same configured to minimize light loss that may occur when the projection lens system is offset.

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 compact 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, the light source, and shaping the light from the light source and applied to the optical modulator unit, An optical processing unit for projecting image light passing through the modulator unit through a projection lens system, and an optical modulator unit for forming an image by adjusting the contrast of the light using light formed from the optical processing unit, and the projection lens system includes an offset ( It is designed to give an offset, and the lens located in front of the optical modulator unit is decentered vertically on the central optical axis.

The lens positioned in front of the optical modulator may be a field lens, and the field lens may be decentered such that an average value of telecentric angles of the lens is equal to an emission angle of light exiting the field lens.

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

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

On the other hand, it is preferable that the said optical modulator part is comprised including the liquid crystal panel.

The apparatus may further include a signal processor configured to provide an electrical signal corresponding to an image to be acquired and a control signal required for driving the projector to the light source and the optical modulator.

In addition, a compact projector according to the present invention for achieving the above object is a projector capable of projecting a screen of the resolution provided by the mobile communication terminal, the light source and the light from the light source is molded and applied to the optical modulator unit, And an optical processing unit for projecting the image light passing through the optical modulator unit through a projection lens system, and the optical modulator unit forming an image by adjusting the contrast of the light using the light formed from the optical processing unit. The structure is designed by giving an offset, and may be configured such that the lens positioned in front of the optical modulator unit has an inclination in the optical axis direction on the central optical axis.

In this case, the lens located in front of the optical modulator portion is a field lens, the field lens has a tilt in the optical axis direction so that the average value of the telecentric angle of the lens is equal to the exit angle of the light exiting the field lens. It is preferable.

On the other hand, a mobile communication terminal according to the present invention for achieving the above object is a mobile communication terminal having a projector that can project a screen of the resolution provided by the mobile communication terminal, and performs wireless transmission and reception such as voice call and data communication And a communication unit in charge, 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. And shaping the light from the light source and applying the light to the optical modulator unit, and projecting the image light passing through the optical modulator unit through a projection lens system, and adjusting the contrast of the light using the light formed from the optical processor. The optical module forming an image The projection lens system, and includes a may be of a structure designed by a given offset (offset), the lens located in the optical modulator unit in the front end vertical center-di (decenter) on the central optical axis.

In addition, 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, and performs wireless transmission and reception such as voice call and data communication And a communication unit in charge, 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. And shaping the light from the light source and applying the light to the optical modulator unit, and projecting the image light passing through the optical modulator unit through a projection lens system, and adjusting the contrast of the light using the light formed from the optical processor. The optical module forming an image The projection lens system has a structure designed by giving an offset, and the lens positioned in front of the optical modulator unit may be configured to have an inclination in the optical axis direction on the central optical axis.

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.

Accordingly, the present invention can improve the light efficiency by improving the alignment structure of the field lens to minimize the light loss that may occur when the projection lens system is offset.

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.

Meanwhile, the small projector 14 may be designed by giving an offset to the projection lens system.

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

2 and 3, the configuration of a small projector according to an embodiment of the present invention will be described in detail.

2 is a schematic configuration diagram of the small projector of FIG. 1, and FIG. 3 is an exploded perspective view for describing a detailed configuration of the small projector.

As shown in FIG. 2 and FIG. 3, the small projector 14 is a projector capable of projecting a screen having a resolution provided by the mobile communication terminal 10, and can be mounted and used in a portable medium such as a mobile communication terminal. A portable projector that can be attached or detached or a small projector that can be embedded in the mobile communication terminal.

The small projector is configured to apply the light source 100 of each of the R, G, and B (110, 120, 130) and the light from the light source 100 into a predetermined shape and apply it to the optical modulator unit 300. An optical processor 200 configured to project the image light that has passed through the optical modulator unit 300 onto the screen 1 through the projection lens system 250, and the light molded in a predetermined form from the optical processor 200. The optical modulator 300 to form an image by controlling the light intensity by controlling the degree of light transmission or the degree of reflection of the light, an electrical signal corresponding to the image to be obtained, and various control signals required for driving the projector. It includes a signal processor 400 for transmitting to the light source 100 and the optical modulator 300.

The light source 100 uses light sources 110, 120, and 130 of R, G, and B, respectively, and a laser light source or a light emitting diode (LED) light source may be employed.

The optical processor 200 collects light emitted from each of the R, G, and B light sources 110, 120, and 130 using the condensing lenses 211, 212, and 213, and collects the light again using a dichroic mirror ( Synthesis is performed on the same optical axis by using a color synthesis system including dichroic mirrors 221 and 222.

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 the light is sent to the optical modulator 300 through the field lens 240 to form an image.

The image light passing through the optical modulator 300 may be projected to the screen 1 through the projection lens system 250.

The projection lens system 250 is a collection of lenses.

In addition, the dichroic mirrors 221 and 222 reflect only light of the corresponding wavelength band and pass the rest. For example, the R dichroic mirror 222 reflects only light in the R wavelength band and transmits light in the remaining wavelength band.

Reference numerals 223 and 225 denote mirrors.

The optical modulator unit 300 may be configured as a liquid crystal panel. When an electrical signal corresponding to an image to be obtained is selectively applied to a plurality of electrodes by driving the liquid crystal, the alignment of the liquid crystal filled on the selected electrode is changed. In turn, the image may be generated by controlling the degree of transmission or reflection of the light emitted from the optical processor 200.

Specifically, the liquid crystal panel may be divided into a projection type liquid crystal panel and a reflective liquid crystal panel, and both the upper and lower electrodes of the projection type liquid crystal panel are transparent electrodes, and the reflective type liquid crystal panel is a reflective electrode and the upper plate is a transparent electrode. Has features.

Specific configurations of the projection type and the reflection type liquid crystal panel are well-known techniques, and detailed descriptions thereof are omitted.

The projection type liquid crystal panel may generate an image by controlling the intensity of light by controlling the degree of transmission of the light, and the reflection type liquid crystal panel may generate an image by adjusting the intensity of light by controlling the degree of reflection of the light.

Meanwhile, the small projector of the present invention is designed by giving an offset to the projection lens system 250.

The offset is a technique for changing the position of the light incident on the projection lens system 250 to represent a step and an image when the image formed on the screen does not give an offset.

4 is a diagram illustrating a general alignment structure of a liquid crystal panel and a field lens with respect to the projection lens system when the projection lens system is offset, and FIG. 5 is a diagram illustrating an incident angle of light incident to the projection lens in the alignment structure of FIG. 4. It is a figure shown.

As shown in FIG. 4, when the projection lens system 250 is offset, the liquid crystal panel, which is the optical modulator 300, is positioned below the center line of the projection lens system 250.

Similarly, the field lens 240 is aligned with respect to the liquid crystal panel.

As described above, the angle of incidence of the light incident on the projection lens system 250 in the general alignment structure when the projection lens system 250 is offset may be represented as shown in FIG. 5.

As shown in FIG. 5, the angle of incidence of the light incident to the center of the projection lens and the angle of incidence of the light incident toward the lower side of the projection lens have a subtle difference, which is due to the shape of the lens and degrades the light efficiency. .

6 is a diagram illustrating an incident angle range distribution of incident light when the projection lens system is offset.

Specifically, as shown in FIG. 6, when the projection lens system is offset, the incident angle range of incident light is in the range of −10 degrees to +30 degrees.

However, the range of incidence angles that the projection lens can accept under the condition of F # of the projection lens is the range of A rectangle (a) in FIG.

Specifically, when the F # value of the projection lens is 2.8, the cone angle of incident light is 10.12 degrees or more, and the projection lens may not be accepted.

Therefore, the present invention aims to increase the light efficiency by decentering the field lens in the image direction and shifting the incident angle range of the incident light to the incident angle range of the B rectangle (b).

That is, the angle of incidence of the light incident on the projection lens should be similar.

Hereinafter, embodiments of the alignment structure of the liquid crystal panel 300 and the field lens 240 with respect to the projection lens system 250 designed to improve light efficiency when the projection lens system 250 is offset are described. do.

First, a small projector according to a first embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a view for explaining the structure of a compact projector according to a first embodiment of the present invention, and shows an alignment structure of a liquid crystal panel and a field lens for a projection lens system, and FIG. 8 is an alignment structure of FIG. The simulation shows the angle of incidence of the light incident on the projection lens at.

As shown in FIG. 7, according to the first embodiment of the present invention, the center of the field lens 240 is decentered, and the light passing through the field lens 240 into the projection lens system 250 is reflected. The angle of incidence was set to have a similar value.

Specifically, the field lens 240 is decentered in the upward direction with respect to the liquid crystal panel 300.

Here, the decenter means that the center of the lens is moved and arranged in such a manner that the center of the field lens is moved from the center to the upper direction.

The criterion for decentering the field lens 240 is as follows.

The field lens 240 is decentered so that the average value of the telecentric angles of the field lens 240 is equal to the emission angle of the light exiting the field lens 240.

In this case, the telecentric angle of the field lens 240 is an angle caused by a spherical lens, and the telecentric angle is slightly different for each lens field position, and the angle of the average value of the telecentric angle is emitted. The field lens 240 may be decentered to have the same exit angle.

If the exit angles of the light emitted from the decentered field lens 240 all have similar values, the angle is an average value of the telecentric angles.

8 illustrates that the field lens 240 is decentered by 1.5 mm so that the maximum value of the telecentric angle of the field lens 240 is 12 when the F # value of the projection lens is 2.8. The emission angle of the light emitted from the figure is an exemplary view showing an angle of 5.7 degrees.

That is, according to the first embodiment of the present invention, the center lens 240 is decentered so that the average value of the telecentric angle of the field lens 240 is equal to the exit angle of the light exiting the field lens 240. The angle of incidence of the light incident to the projection lens system 250 may have a similar value, thereby improving the light efficiency of the small projector.

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

FIG. 9 is a view for explaining the structure of a small projector according to a second embodiment of the present invention, and shows an alignment structure of a liquid crystal panel and a field lens with respect to the projection lens system.

As shown in FIG. 9, according to the second embodiment of the present invention, light is incident to the projection lens system 250 by passing the field lens 240 by tilting the field lens 240 in the optical axis direction. Their incidence angles have similar values.

Specifically, the field lens 240 is tilted in the direction of the optical axis of the light source, and the tilt degree is such that the average value of the telecentric angle of the field lens 240 exits the field lens 240. It is preferable to tilt the field lens 240 in the optical axis direction to be equal to the exit angle of light.

Accordingly, in the second embodiment of the present invention, the field lens 240 is moved in the optical axis direction such that the average value of the telecentric angle of the field lens 240 is equal to the emission angle of the light exiting the field lens 240. By having the tilt, the incident angle of the light incident to the projection lens system 250 may have a similar value, thereby improving the light efficiency of the small projector.

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 can be applied to a mobile communication terminal having a projector.

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

FIG. 2 is a schematic configuration diagram of the small projector of FIG. 1.

3 is an exploded perspective view for explaining a detailed configuration of a small projector.

4 is a diagram illustrating a general alignment structure of a liquid crystal panel and a field lens with respect to the projection lens system when the projection lens system is offset.

FIG. 5 is a diagram schematically illustrating an incident angle of light incident to a projection lens in the alignment structure of FIG. 4.

6 is a diagram illustrating an incident angle range distribution of incident light when the projection lens system is offset.

FIG. 7 is a view for explaining the structure of a compact projector according to a first embodiment of the present invention, and shows an alignment structure of a liquid crystal panel and a field lens for a projection lens system.

FIG. 8 is a simulation diagram illustrating an incident angle of light incident to a projection lens in the alignment structure of FIG. 7.

FIG. 9 is a view for explaining the structure of a small projector according to a second embodiment of the present invention, and shows an alignment structure of a liquid crystal panel and a field lens with respect to the projection lens system.

<Description of Symbols for Main Parts of Drawings>

100: light source 200: optical processing unit

210: condenser lens 221, 222: dichroic mirror

230: beamshaper 240: field lens

250: projection lens system 300: optical modulator unit

400: signal processing unit

Claims (12)

A projector capable of projecting a screen of a resolution provided by a mobile communication terminal, Light source; An optical processor for shaping and applying light from the light source to an optical modulator unit, and projecting the image light passing through the optical modulator unit through a projection lens system; And The optical modulator unit for controlling the contrast of the light using the light formed from the optical processing unit to form an image, The projection lens system is designed to give an offset (offset), And a lens positioned in front of the optical modulator unit so as to be decentered vertically on a central optical axis. In claim 1, The lens positioned in front of the optical modulator part is a field lens, and the small lens is decentered so that the average value of the telecentric angle of the lens is equal to the exit angle of the light exiting the field lens. . In claim 1, The light source is, Compact projector including a laser light source. In claim 1, The light source is, Compact projector comprising a light emitting diode (LED) light source. In claim 1, The optical modulator unit, Small projector comprising a liquid crystal panel. In claim 1, And a signal processor for providing an electrical signal corresponding to an image to be acquired and a control signal for driving the projector to the light source and the optical modulator. A projector capable of projecting a screen of a resolution provided by a mobile communication terminal, Light source; An optical processor for shaping and applying light from the light source to an optical modulator unit, and projecting the image light passing through the optical modulator unit through a projection lens system; And The optical modulator unit for controlling the contrast of the light using the light formed from the optical processing unit to form an image, The projection lens system is designed to give an offset (offset), And a lens positioned in front of the optical modulator unit to be inclined in the optical axis direction on the central optical axis. In claim 7, The lens positioned in front of the optical modulator part is a field lens, and the field lens has an inclination in the optical axis direction such that an average value of telecentric angles of the lens is equal to an exit angle of light exiting the field lens. Compact projector. 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, Light source; An optical processor for shaping and applying light from the light source to an optical modulator unit, and projecting the image light passing through the optical modulator unit through a projection lens system; And The optical modulator unit for controlling the contrast of the light using the light formed from the optical processing unit to form an image, The projection lens system is designed to give an offset (offset), And a lens positioned in front of the optical modulator unit, decentered vertically on a central optical axis. 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, Light source; An optical processor for shaping and applying light from the light source to an optical modulator unit, and projecting the image light passing through the optical modulator unit through a projection lens system; And The optical modulator unit for controlling the contrast of the light using the light formed from the optical processing unit to form an image, The projection lens system is designed to give an offset (offset), And a lens positioned in front of the optical modulator unit inclined in the optical axis direction on a central optical axis. The method of claim 9 or 10, The projector, A mobile communication terminal, characterized in that the portable form detachable to the mobile communication terminal. The method of claim 9 or 10, The projector, And a mobile communication terminal embedded in the mobile communication terminal.

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