KR100767671B1 - Optical system for portable projector - Google Patents

Abstract

The present invention relates to an optical system for a portable projector, comprising: a light transmissive member, a light source for emitting light over a first side of the member to transmit light into the member, the light source being supported on a second side of the member At least one DOE (Diffraction Optical Element) lens that diffracts the light incident from the light source and reflects the light into the member, and is supported on the first or second surface of the member to reflect back the light reflected into the member. It may be configured to include at least one or more optical elements that are reflected inside the member or emitted to the outside of the member.

Light transmissive member, light source, optical element, scan mirror, display element

Description

Optical system for portable projector

1 is a view showing the configuration of a typical single-plate projector

2 is a view showing the configuration of a typical three-panel projector

3A is a perspective view showing an optical system for a portable projector according to a first embodiment of the present invention;

3B is a cross-sectional view of FIG. 3A

4A-4E show a DOE lens usable in an optical system for a portable projector according to the present invention.

Fig. 5A is a perspective view showing an optical system for a portable projector according to a second embodiment of the present invention.

5B is a cross-sectional view of FIG. 5A

6 is a schematic view showing a mobile laser projector phone to which the optical system for a portable projector according to the present invention is applied.

Explanation of symbols for main parts of the drawings

50,60 light transmitting member 51,61 light source

52a-52g: Optical Element

62a to 62e: first optical element 63: display element

64a-64c: second optical element

TECHNICAL FIELD The present invention relates to a projector, and more particularly to an optical system for a portable projector.

Recently, display devices are becoming lighter and thinner, as well as larger screens, and among various display devices, a projector has been spotlighted as a display device for implementing a large screen of 100 inches or more.

Such a projector projects an image generated from a micro device such as a transmissive liquid crystal display (LCD) panel, a reflective liquid crystal on silicon (LCoS) panel, or a digital micromirror device (DMD) panel on a screen to display a screen. It is a device to form.

In general, projectors are classified into single-plate, two- and three-panel projectors according to the number of micro devices used.

Here, the single-plate projector is a method of illuminating a single micro device by separating the color from light in time, and the two-panel projector is a method of illuminating two micro devices by separating the color from light in space and time. Projectors illuminate three microelements by spatially separating colors from light.

1 is a view showing the configuration of a general single-panel projector, Figure 2 is a view showing the configuration of a general three-panel projector.

As shown in FIG. 1, the single-plate projector includes a light source 2, a color drum 3, a rod lens 4, illumination lenses 5.6, a micro element 7, a prism 8, and a projection lens. 1) and the like.

In a single-plate projector, the light generated from the light source is separated into red light, green light, and blue light through a color drum, and each light has a uniform brightness while passing through a rod lens, and then enters a micro device through illumination lenses and a prism. do.

The incident light has an image signal through the micro device, and is then projected onto the screen through the prism and the projection lens.

In addition, as shown in FIG. 2, the three-panel projector uses a dichroic mirror 9 to separate the light generated by the light source 2, and the separated red light, green light, and blue light respectively correspond. Incident on the LCD panel 10, the incident light is synthesized and projected onto the screen through the projection lens 1.

However, the existing projectors configured as described above require very large space because not only a large number of optical elements are required but also an optical system must be three-dimensionally constructed.

This configuration of the optical system has a limit to downsizing the size of the projector itself.

In addition, the conventional projector has a long path of light from the light source to the projection lens, so there is a limit in expressing bright and clear images due to light loss.

In addition, the conventional projector has a problem that the arrangement of the optical elements is unstable because the configuration of the optical system is three-dimensional.

An object of the present invention is to provide an optical system for a portable projector that can reduce the size of the projector by minimizing the space of the optical system by configuring the optical system in a new form.

It is another object of the present invention to provide an optical system for a portable projector that can reduce light loss by minimizing the light path.

Another object of the present invention is to provide an optical system for a portable projector that can stabilize the arrangement of optical elements.

An optical system for a portable projector according to the present invention is a light transmissive member, a light source for emitting light onto a first side of the member to transmit light into the member, supported on a second side of the member, and At least one DOE (Diffraction Optical Element) lens that diffracts the light incident from the light source and reflects it into the member, and is supported on the first or second surface of the member to reflect back the light reflected into the member to And at least one optical element that reflects into the member or exits out of the member.

Here, the light transmissive member may be a glass, plastic, or a hollow type member having air or vacuum therein.

The cross section of the light transmissive member may be a circle, a semicircle, a triangle, or a polygon, and the light transmissive member may have a linear and flat surface.

In addition, a region of the entire surface of the light transmissive member on which the optical element is supported may be projected or hollow, and the first and second surfaces of the light transmissive member may be faces facing each other.

The light source may be any one of a laser diode, a light emitting diode, and an organic electroluminescent device, and the light source may be a light emitting device or an array of light emitting devices that irradiate beams having a single wavelength or different wavelengths.

In addition, the light source may be supported on the first surface or positioned at a predetermined distance from the first surface, and the light source includes a red light source that generates red light, a green light source that generates green light, and a blue light source that generates blue light. The red light source, the green light source, and the blue light source may be arranged in parallel with each other on the same surface.

The optical device may be at least one of a diffraction optical element, a hologram optical element, a plane mirror, a micro display, and a scan mirror. The optical element may be a flat plate type.

Next, the optical elements supported on at least one of the first and second surfaces of the light transmissive member may be arranged in parallel with each other, and the optical elements and the light transmissive supported on the first surface of the light transmissive member. The optical elements supported on the second surface of the member may be arranged to be offset from each other by a predetermined angle.

Then, optical elements having a drive circuit may be disposed on the first surface of the light transmissive member, and optical elements having no drive circuit may be disposed on the second surface of the light transmissive member.

Further, an optical system for a portable projector according to the present invention includes a light transmitting member, a light source for emitting light to the first surface of the member according to an external image signal so that light is transmitted into the member, and At least one optical element supported on at least one of the first and second surfaces and diffracting and reflecting the light incident from the light source into the member, and the light diffracted and reflected from the optical element according to an external control signal And at least one scan mirror for scanning onto a screen outside the member.

In addition, the optical system for a portable projector according to the present invention includes a light transmitting member, a light source for emitting light to the first surface of the member so that light is transmitted into the member, and at least one of the first and second surfaces of the member. At least one first optical element which is supported on either side and which combines the light incident from the light source and increases the cross-sectional area of the light, and is supported on at least one of the first and second sides of the member and from the first optical element A display element configured to receive the synthesized light to implement an image, and at least one second optical element supported on at least one of the first and second surfaces of the member and magnifying and outputting an image generated from the display element; Can be configured.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

The concept of the present invention is to provide an optical system suitable for a portable projector by arranging optical elements on both sides of the light transmissive member to stabilize the arrangement of the optical elements, and by transmitting light through the light transmissive member to reduce the length of the optical path. have.

3A is a perspective view showing an optical system for a portable projector according to a first embodiment of the present invention, and FIG. 3B is a sectional view of FIG. 3A.

As shown in Figs. 3A and 3B, the optical system of the present invention is largely composed of a light transmitting member 50, a light source 51, and optical elements 52a to 52g.

Here, the light transmissive member 50 may be glass, plastic, a hollow type member having an air or a vacuum therein, or any material that can transmit light well, and may be light transmissive according to an optical design. The size of the member 50 is determined.

In some cases, the cross section of the light transmissive member 50 may be manufactured as a circle, a semicircle, a triangle, a polygon, or the like.

In the embodiment of the present invention, the light transmissive member 50 is manufactured to have a linear and flat surface.

In addition, depending on the design, a region in which the optical elements 52a to 52g are supported among the entire surfaces of the light transmissive member 50 may be manufactured so that the surface is projected or hollowed out.

The light source 51 emits light onto the first surface of the member so that the light passes through the light transmitting member.

Here, the light source 51 may be a laser diode, a light emitting diode, an organic electroluminescent device, or the like. Preferably, the optical system may be configured using the laser diode to further reduce the size of the projector.

In some cases, a light emitting device for irradiating a beam of a single wavelength or a light emitting device for irradiating beams of different wavelengths may be manufactured and used in an array form.

In the embodiment of the present invention, the light source 51 includes a red light source 51a for generating red light, a green light source 51b for generating green light, and a blue light source 51c for generating blue light. The 51a, the green light source 51b, and the blue light source 51c were manufactured so as to be arranged in a line on the same surface.

The light source 51 may be supported on the first surface of the light transmissive member 50 or on another member spaced apart from the first surface by a predetermined distance.

Next, the optical elements 52a-52g are supported on at least one of the first and second surfaces of the light transmissive member 50, and the light incident from the light source 51 is transferred into the light transmissive member 50. The light is reflected and imaged to exit the light transmitting member 50.

In the embodiment of the present invention, the first and second surfaces of the light transmissive member 50 are formed to face each other.

Here, the optical element 52 may use a diffraction optical element, a hologram optical element, a plane mirror, a micro display, a scan mirror, or the like. In addition, the optical element 52 is preferably used to produce a flat plate (flat plate) type.

In the first embodiment of the present invention, the optical element supported on the first surface of the light transmissive member 50 is composed of at least one DOE lens 52d and at least one scan mirror 52f, and the light transmissive member 50 The optical element supported on the second surface of the () is composed of at least one DOE lens (52a-52c) and at least one plane mirror (52e) may be further composed of at least one scan mirror (52g).

Here, the optical elements supported on at least one of the first and second surfaces of the light transmissive member 50 are configured to be arranged in line with each other in parallel with each other, and are supported on the first surface of the light transmissive member 50. The optical elements 52d and 52f and the optical elements 52a, 52b, 52c, 52e and 52g supported on the second surface of the light transmissive member 50 may be arranged to be offset from each other by a predetermined angle.

This is because the light transmission path can be minimized.

In order to optimize the configuration of the optical system of the present invention, optical elements having a driving circuit are disposed on the first surface of the light transmissive member 50, and a drive circuit is not provided on the second surface of the light transmissive member 50. It is desirable to arrange optical elements that do not.

The reason for this is that if the components that require circuit configuration are configured on one side, the spatial utilization is useful, which further reduces the size of the optical system.

4A-4E show DOE lenses usable in the optical system for a portable projector according to the present invention, which may use various DOE lenses depending on the design of the optical system.

Thus, the operation method of the portable projector optical system according to the first embodiment of the present invention is as follows.

As shown in FIGS. 3A and 3B, first, the red light source 51a, the green light source 51b, and the blue light source 51c are formed on the first surface of the light transmitting member 50 according to an external image signal. To emit light.

Light emitted from the light source 51 passes through the light transmissive member 50 and enters into DOE lenses, which are optical elements 52a, 52b, 52c, which are supported on the second surface, which is the opposite side of the light transmissive member 50.

At this time, the DOE lenses, which are the optical elements 52a, 52b, 52c, are arranged to deviate by a predetermined angle from the light source 51, so that the light source 51 tilts the light at a predetermined angle and emits the light.

Then, DOE lenses, which are optical elements 52a, 52b, 52c, respectively, diffract incident light and exit to DOE lenses, which are other optical elements 52d supported on the first surface of the light transmissive member 50.

The DOE lens, which is another optical element 52d, combines the light diffracted from the optical elements 52a, 52b, 52c, and is another optical element 52e formed on the second surface of the light transmissive member 50. Exit to the mirror.

The plane mirror which is the optical element 52e reflects the light synthesized from the optical element 52d to the scan mirror which is another optical element 52f formed on the first surface of the light transmissive member 50.

The scan mirror, which is another optical element 52f, scans the light reflected from the plane mirror, which is the optical element 52e, to the left and right directions in accordance with an external control signal and exits to the scan mirror, which is another optical element 52g.

Subsequently, the scan mirror, which is the optical element 52g, scans the light scanned in the left and right directions in the vertical direction according to an external control signal and emits the light onto the screen outside the light transmitting member 50.

FIG. 5A is a perspective view showing an optical system for a portable projector according to a second embodiment of the present invention, and FIG. 5B is a sectional view of FIG. 5A.

As shown in FIGS. 5A and 5B, the optical system of the present invention includes a light transmitting member 60, a light source 61, first optical elements 62a-62e, display element 63, and a second optical element. (64a-64c).

Here, the light source 61 is composed of a red light source 61a for generating red light, which is a laser diode, a green light source 61b for generating green light, and a blue light source 61c for generating blue light. As in the first embodiment, various light sources may be used.

In addition, the first optical elements 62a to 62e are supported on at least one of the first and second surfaces of the light transmissive member 60, synthesize the light incident from the light source 61, and increase the cross-sectional area of the light. Play a role of

Here, the first optical elements 62a to 62e may use a plate type diffraction optical element, a hologram optical element, a plane mirror, or the like.

In the embodiment of the present invention, a DOE lens which is a diffractive optical element is used as the first optical elements 62a to 62c formed on the second surface of the light transmissive member 60, and each DOE lens corresponds to the light source 61 respectively. The laser light generated from the diffraction is diffracted.

The other first optical element 62d formed on the first surface of the light transmissive member 60 used a DOE lens, which is a diffractive optical element, and synthesizes light diffracted from the first optical elements 62a to 62c. .

Subsequently, another first optical element 62e formed on the second surface of the light transmissive member 60 used a DOE lens which is a diffractive optical element, and the light synthesized from the first optical element 62d was used as a display element. 63).

In some cases, only one first optical element may be configured.

Next, the display element 63 is formed on the first surface of the light transmitting member 60 and receives the synthesized light from the first optical element 62e to implement an image.

Subsequently, the second optical elements 64a to 64c are formed on at least one of the first and second surfaces of the light transmissive member 60 and serve to enlarge and output an image generated from the display element 63. do.

Here, the second optical elements 64a to 64c may use a plate type diffraction optical element, a hologram optical element, a plane mirror, or the like.

In the embodiment of the present invention, a plane mirror is used as the second optical element 64a formed on the second surface of the light transmitting member 60, and the plane mirror reflects light including an image from the display element 63. .

The other second optical element 64b formed on the first surface of the light transmissive member 60 uses a DOE lens, which is a diffractive optical element, and diffracts the light reflected from the second optical element 64a.

Next, another second optical element 64c formed on the second surface of the light transmissive member 60 is a DOE lens, which enlarges the light diffracted from the second optical element 64b and outputs it to an external screen.

Thus, the operation method of the portable projector optical system according to the second embodiment of the present invention is as follows.

As shown in FIGS. 5A and 5B, first, the red light source 61a, the green light source 61b, and the blue light source 61c are the first surface of the light transmitting member 60 according to an external image signal. To emit light.

The light emitted from the light source 61 passes through the light transmissive member 60 and enters into DOE lenses, which are optical elements 62a, 62b, 62c supported on the second surface, which is the opposite side of the light transmissive member 60.

At this time, the DOE lenses, which are the first optical elements 62a to 62c, are arranged to be shifted by a predetermined angle from the light source 61, so that the light source 61 tilts the light at a predetermined angle and emits the light.

Then, the DOE lenses, which are the first optical elements 62a to 62c, respectively diffract incident light and exit to DOE lenses, which are other first optical elements 62d formed on the first surface of the light transmissive member 60.

The DOE lens, which is another first optical element 62d, synthesizes light diffracted from the first optical elements 62a to 62c, and another first optical element formed on the second surface of the light transmissive member 60. Exit with DOE lens.

The DOE lens, which is another first optical element 62e, diffracts the light synthesized from the first optical element 62d into the display element 63 formed on the first surface of the light transmissive member 60.

Next, the display element 63 receives the synthesized light from the first optical element 62e to implement an image, and outputs to a plane mirror which is the second optical element 64a formed on the second surface of the light transmissive member 60. do.

The plane mirror, which is the second optical element 64a, reflects light from the display element 63 to the DOE lens, which is another second optical element 64b formed on the first surface of the light transmissive member 60. .

The DOE lens, which is another second optical element 64b, diffracts the light reflected from the second optical element 64a and is another second optical element 64c formed on the second surface of the light transmissive member 60. Reflect with DOE lens.

The DOE lens, which is another second optical element 64c, diffracts and enlarges the light diffracted from the second optical element 64b and outputs it to an external screen.

The optical system for a portable projector according to the present invention operated in this way not only stabilizes the arrangement of the optical elements, but also reduces the length of the optical path by transmitting light through the light transmitting member, thereby miniaturizing and reducing the weight. It is suitable for portable projectors.

FIG. 6 is a schematic view showing a mobile laser projector phone to which the optical system for a portable projector according to the present invention is applied. As shown in FIG. 6, it is easily applied even in an environment having a small space such as a mobile phone. can do.

As described above, the optical system for a portable projector according to the present invention can stabilize the arrangement of the optical elements by disposing the optical elements on both sides of the light transmissive member, and reduce the length of the optical path by transmitting the light through the light transmissive member. Can be.

Therefore, the present invention can be miniaturized and lightened in the projector, and can be applied to portable devices such as a mobile phone, and various applications can be made as necessary, so that the application field is wide.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (20)

Light transmissive member; A light source emitting light onto the first surface of the member to transmit light into the member; At least one DOE (Diffraction Optical Element) lens supported on the second surface of the member and diffracting the light incident from the light source to reflect into the member; And And at least one optical element supported on the first surface or the second surface of the member and reflecting light reflected back into the member to reflect inside the member or exit from the member. Optical system for portable projectors. 2. The optical system of claim 1, wherein the light transmissive member is a hollow type member which is glass, plastic, air or vacuum inside. The optical system for a portable projector according to claim 1, wherein the cross section of the light transmissive member is a circle, a semicircle, a triangle, or a polygon. 2. The optical system of claim 1, wherein the light transmissive member has a linear and flat surface. The optical system for a portable projector according to claim 1, wherein an area of the entire surface of the light transmissive member on which the optical element is supported is projected or hollow. The optical system of claim 1, wherein the first and second surfaces of the light transmissive member face each other. The optical system of claim 1, wherein the light source is any one of a laser diode, a light emitting diode, and an organic electroluminescent element. The optical system of claim 1, wherein the light source is a light emitting element or an array of light emitting elements for irradiating beams of a single wavelength or different wavelengths. The optical system of claim 1, wherein the light source is supported on the first side of the member or is spaced a predetermined distance from the first side of the member. The optical system of claim 1, wherein the light source comprises a red light source for generating red light, a green light source for producing green light, and a blue light source for generating blue light. The optical system of claim 10, wherein the red light source, the green light source, and the blue light source are arranged side by side on the same plane. The optical device of claim 1, wherein the optical device comprises at least one of a diffraction optical element, a hologram optical element, a plane mirror, a micro display, and a scan mirror. The optical system for a portable projector, characterized in that any one. The optical system for a portable projector according to claim 1, wherein the DOE lens and the optical element are of a flat plate type. 2. The optical element of claim 1, wherein the optical element supported on the first side of the light transmissive member is comprised of at least one DOE lens and at least one scan mirror, and the optical element supported on the second side of the light transmissive member is at least An optical system for a portable projector comprising one DOE lens and at least one plane mirror. The optical element supported on the first side of the light transmissive member comprises at least one DOE lens and a micro display, and the optical element supported on the second side of the light transmissive member comprises at least one DOE. An optical system for a portable projector comprising a lens and at least one plane mirror. The optical system for a portable projector according to claim 1, wherein the optical elements supported on at least one of the first and second surfaces of the light transmitting member are arranged in line with each other. The portable device according to claim 1, wherein the optical elements supported on the first surface of the light transmissive member and the optical elements supported on the second surface of the light transmissive member are arranged to be offset from each other by a predetermined angle. Optical system for projectors. 2. The portable device according to claim 1, wherein optical elements having a drive circuit are disposed on the first side of the light transmissive member, and optical elements having no drive circuit are arranged on the second side of the light transmissive member. Optical system for projectors. Light transmissive member; A light source emitting light to a first surface of the member according to an external image signal so that light is transmitted to the inside of the member; A DOE lens supported on the second surface of the member and diffracting and reflecting light incident from the light source into the member; At least one optical element supported on one of the first or second surfaces of the member to diffract and reflect light reflected into the member into the member; And And at least one scan mirror for scanning the light diffracted and reflected from the optical element onto a screen outside of the member in accordance with an external control signal. Light transmitting member; A light source for emitting light to the first surface of the member so that light is transmitted to the inside of the member; At least one first optical element supported on at least one of the first side and the second side of the member, the at least one first optical element including at least one DOE lens for synthesizing light incident from the light source and increasing the cross-sectional area of the light; A display device supported on at least one of the first and second surfaces of the member and configured to receive an image synthesized from the first optical device to implement an image; And, And at least one second optical element which is supported on at least one of the first side and the second side of the member and which enlarges and outputs an image generated from the display element. Optical system.

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