KR100686882B1 - Optical system of projection display - Google Patents

Optical system of projection display Download PDF

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Publication number
KR100686882B1
KR100686882B1 KR1020050028125A KR20050028125A KR100686882B1 KR 100686882 B1 KR100686882 B1 KR 100686882B1 KR 1020050028125 A KR1020050028125 A KR 1020050028125A KR 20050028125 A KR20050028125 A KR 20050028125A KR 100686882 B1 KR100686882 B1 KR 100686882B1
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South Korea
Prior art keywords
light
wavelength
wavelengths
optical system
emitted
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KR1020050028125A
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Korean (ko)
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KR20060105384A (en
Inventor
박종명
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엘지전자 주식회사
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/24Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G27/00Self-acting watering devices, e.g. for flower-pots
    • A01G27/02Self-acting watering devices, e.g. for flower-pots having a water reservoir, the main part thereof being located wholly around or directly beside the growth substrate
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G7/00Botany in general
    • A01G7/04Electric or magnetic or acoustic treatment of plants for promoting growth
    • A01G7/045Electric or magnetic or acoustic treatment of plants for promoting growth with electric lighting
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00Photometry, e.g. photographic exposure meter
    • G01J1/42Photometry, e.g. photographic exposure meter using electric radiation detectors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00Adaptations of thermometers for specific purposes
    • G01K13/10Adaptations of thermometers for specific purposes for measuring temperature within piled or stacked materials

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system of a projection display, wherein the light of a light source is time-divided, and some of the time-divided wavelengths of light are polarized and reflected by the optical part, and then input to the first micro display, and the other is transmitted through the optical part. By inputting into a micro display, a two-hole reflective projection system can be implemented, which can simplify manufacturing components, reduce manufacturing costs, and reduce weight and weight.
Optical system, micro, display, polarization, selection, reflection, transmission, emission

Description

Optical system of projection display

1 is a block diagram of a typical single plate optical system

2 is a block diagram of an optical system of a projection display according to the present invention

3 is a block diagram of an embodiment of an illumination unit used in the optical system according to the present invention

4A and 4B are conceptual views for explaining the function of the color divider used in the lighting unit according to the present invention.

5A through 5C are diagrams for explaining light time-division in a color splitter according to the present invention.

6 is a view for explaining the operation of the red light is emitted to the optical system of the projection display according to the present invention

7 is a view for explaining an operation of emitting green light or blue light to the optical system of the projection display according to the present invention;

8 is a graph of spectral transmittance in a color division in an optical system according to the present invention

9 is a graph of spectral transmittance before incident yellow light into a wavelength selective polarization transducer in an optical system according to the present invention.

10 is a graph of one spectral transmittance after yellow light passes through a wavelength selective polarization converting part in an optical system according to the present invention.

FIG. 11 is a graph of another spectral transmittance after yellow light passes through a wavelength selective polarization converting part in an optical system according to the present invention. FIG.

12 is a graph of spectral transmittance before magenta light enters a wavelength selective polarization transducer in an optical system according to the present invention.

13 is a graph of one spectral transmittance after magenta light passes through a wavelength selective polarization converting part in an optical system according to the present invention.

14 is a graph of another spectral transmittance after magenta light passes through a wavelength selective polarization converting part in an optical system according to the present invention;

15 is another configuration diagram of an optical system of the projection display according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: lighting unit 110: lamp

120: integrator 130: color division

131,132,133,134: color wheel 200,210: wavelength selective polarization converter

300, 310: dichroic prism 301: polarization beam splitter surface

400,410,500,510: Micro Display

600: projection lens 700: screen

The present invention relates to an optical system of a projection display, and more particularly, time-dividing light of a light source into a light emitting device, and some of the time-divided wavelengths of light are polarized and reflected from an optical component, and then input to the first micro display. The present invention relates to an optical system of a projection display that can be transmitted through an optical component and input to a second micro display to realize a two-plate reflective projection system, thereby simplifying components and reducing manufacturing costs, and making it light and thin. .

In recent years, as satellite and digital broadcasting are promoted in earnest, demand and interest for large-screen displays having high resolution have increased, and expectations and roles for projection and projectors have become very important.

In addition, as the demand for high brightness and high definition image information has become stronger, research on high optical efficiency and inexpensive optical system is being conducted in various ways.

In recent years, display devices have tended to become lighter, lighter, and larger, and in particular, projection display devices have become an important issue.

In order to achieve such a light weight and light weight, there is a need for an optical system that reduces the number of micro displays instead of using three micro displays in a projection display.

Such optical systems include two-plate optical systems using two micro displays and single-plate optical systems using one micro display.

1 is a configuration diagram of a general single plate optical system, wherein the single plate optical system includes a lamp 1, an integrator 2, a color wheel 3, an illumination lens 4, It consists of a polarizing beam splitter (PBS) or a total internal reflection (TIR) prism 5 and a panel 6.

In this single plate optical system, the light emitted from the lamp 1 becomes light having a uniform spatial distribution while passing through the integrator 2, and the light passing through the integrator 2 becomes red (in the color wheel 3). It is divided into three colors temporally by three colors of red, green, and blue filters.

This split light passes through the illumination lens 4 and passes through the PBS or TIR prism 5 to the micro display 6.

Such a single plate optical system is inexpensive and simple in structure as compared to a two plate optical system, but has a problem that the amount of light is significantly smaller.

On the other hand, the three-plate optical system has a disadvantage in that the structure is complicated, and a large production cost is required.

In order to solve the problems described above, the present invention time-divides the light of the light source, and some of the time-divided wavelengths of light are polarized and reflected by the optical part, thereby inputting to the first micro display, and the other is transmitted through the optical part. Since it is possible to implement a two-plate reflective projection system by inputting to the second micro display, an object of the present invention is to provide an optical system of a projection display that can simplify manufacturing components to reduce manufacturing costs, and can be made light and thin.

A first preferred aspect for achieving the above objects of the present invention comprises a white light source, time-dividing the light of the white light source into light of the first and second wavelengths or the second and third wavelengths, An illumination unit for polarizing and time-dividing the light;

A wavelength selective polarization converting unit for converting a polarization direction of light having a second wavelength among the light emitted from the lighting unit;

A dichroic prism for reflecting light of the second wavelength whose polarization direction is converted by the wavelength selective polarization converting unit and transmitting light of the remaining wavelengths;

A first micro display which receives light having a second wavelength reflected from the dichroic prism and modulates the light according to a gray level of image information;

A second micro display configured to receive light having a first wavelength or a third wavelength transmitted from the dichroic prism and modulate the light according to a gray level of image information;

There is provided an optical system of a projection display comprising a projection lens for expanding and projecting light modulated and output from the first and second micro displays onto a screen.

A second preferred aspect for achieving the above objects of the present invention comprises a white light source, time-dividing the light of the white light source into light of the first and second wavelengths or the second and third wavelengths, An illumination unit for polarizing and time-dividing the light;

A wavelength selective polarization converting unit converting polarization directions of light having a first wavelength and a third wavelength among light emitted from the illumination unit;

A dichroic prism for reflecting light of the first and third wavelengths of which the polarization direction is converted in the wavelength selective polarization converting unit and transmitting the light of the second wavelength;

A first micro display which receives light having a second wavelength transmitted through the dichroic prism and modulates the light according to a gray level of image information;

A second micro display configured to receive light having the first and third wavelengths reflected from the dichroic prism and modulate the light according to the gray level of the image information;

There is provided an optical system of a projection display comprising a projection lens for expanding and projecting light modulated and output from the first and second micro displays onto a screen.

A third preferred aspect for achieving the above objects of the present invention is to time-divide the light of a white light source into a pair of synthetic light each containing light of a specific wavelength, and to polarize the time-divided light to emit it. An apparatus;

A first optical component for converting a polarization direction of light having a specific wavelength among light emitted from the device;

A second optical part for reflecting light having a specific wavelength converted from the polarization direction emitted from the first optical part and transmitting the light having the remaining wavelength;

A first panel which receives light having a specific wavelength reflected from the second optical component and modulates the light according to a gray level of image information;

Provided is an optical system of a projection display including a second panel that receives light of a wavelength transmitted from the second optical component and modulates and outputs the light according to a gray level of image information.

A fourth preferred aspect for achieving the above objects of the present invention is to time-divide the light of a white light source into a pair of synthetic light each containing light of a specific wavelength, and to polarize the time-divided light to emit it. An apparatus;

A first optical component for converting a polarization direction of light having a wavelength included in a pair of synthetic light except light having a specific wavelength among the light emitted from the device;

A second optical component for reflecting light having a wavelength converted by the polarization direction emitted from the first optical component and transmitting light having a specific wavelength;

A first panel which receives light having a wavelength reflected from the second optical component and modulates the light according to a gray level of image information;

Provided is an optical system of a projection display including a second panel that receives light of a specific wavelength transmitted from the second optical component and modulates and outputs the light according to a gray level of image information.

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

2 is a configuration diagram of an optical system of a projection display according to the present invention, including a white light source, time-dividing the light of the white light source into light of the first and second wavelengths or the second and third wavelengths, and time-dividing the light. An illumination unit 100 which is polarized and emitted; A wavelength selective polarization converting unit 200 for converting a polarization direction of light having a second wavelength among the light emitted from the lighting unit 100; A dichroic prism (300) for reflecting light of the second wavelength whose polarization direction is converted by the wavelength selective polarization converting unit (200) and transmitting light of the remaining wavelengths; A first micro display 400 which receives light having a second wavelength reflected from the dichroic prism 300 and modulates the light according to a gray level of image information; A second micro display 500 which receives light having a first wavelength or a third wavelength transmitted from the dichroic prism 300 and modulates the light according to a gray level of image information; And a projection lens 600 to enlarge and project the light modulated and output from the first and second micro displays 400 and 500 onto the screen 700.

Here, the wavelength selective polarization converting unit 200 is preferably a QWP (Quater wave plate).

In addition, the wavelength selective polarization converting unit 200 may convert a P wave (Primary wave) into an S wave (Secondary wave) or an S wave into a P wave.

In addition, the light of the first and second wavelengths is yellow light in which green light and red light are synthesized, and the light of the second and third wavelengths is red light and red light. Blue light is composed of synthesized magenta light.

Alternatively, the light of the first and second wavelengths is yellow light in which red light and green light are synthesized, and the light of the second and third wavelengths is made of green light. Blue light is composed of synthesized cyan light.

In another method, the light of the first and second wavelengths is magenta light in which red light and blue light are synthesized, and the light of the second and third wavelengths is blue light. ) Cyan light is composed of synthesized light and green light.

In addition, the micro display uses a liquid crystal on silicon (LCoS) panel which is a reflective LCD.

However, since the optical system of the present invention can be configured in various ways, the micro display can also be applied to a DMD (Digital Mirror Device) panel or a transmissive LCD panel. For this purpose, the optical system can be modified.

Therefore, the micro display may implement an optical system using any one of a liquid crystal on silicon (LCoS) panel, a digital mirror device (DMD) panel, and a transmissive LCD panel.

The illumination unit 100 of the optical system of the projection display according to the present invention configured as described above time-divides the light of the white light source into light of the first and second wavelengths or the second and third wavelengths, and polarizes the time-divided light and emits the light.

The polarization direction of the light having the second wavelength among the light emitted from the illumination unit 100 is converted by the wavelength selective polarization conversion unit 200.

In addition, the dichroic prism 300 reflects the light of the second wavelength whose polarization direction is converted by the wavelength selective polarization converter 200 and transmits the light of the remaining wavelengths.

In addition, the first micro display 400 receives light of the second wavelength reflected from the dichroic prism 300 and modulates the light according to the gray level, and the second micro display 500 is dichroic. The light of the first wavelength or the third wavelength transmitted from the prism 300 is input and modulated according to the gray level to output the light.

That is, the light of the second wavelength emitted from the illumination unit 100 proceeds along the path 'a' shown in FIG. 2, and the polarization direction is converted in the wavelength selective polarization conversion unit 200 so that the dichroic prism 300 Is reflected at the polarization beam splitter (PBS) surface 301.

The reflected light of the second wavelength is input to the first micro display 300, and modulated according to the gray level of the image information in the first micro display 300.

Light of the modulated second wavelength is transmitted from the polarization beam splitter surface 301 of the dichroic prism 300 and input to the projection lens 600.

In addition, the light of the first wavelength or the third wavelength which is time-divided and emitted from the illumination unit 100 proceeds along the path 'b' shown in FIG. 2, so that the wavelength selective polarization conversion unit 200 and the dichroic prism Passed through 300 is input to the second micro display 500.

At this time, as described above, the second micro display 500 modulates the light having the first wavelength or the third wavelength according to the gray level of the image information.

The modulated first or third wavelength light is reflected from the polarization beam splitter surface 301 of the dichroic prism 300 and input to the projection lens 600.

As a result, the projection lens 600 projects the light of the first to third wavelengths, which are modulated and output from the first and second micro displays 300 and 500, onto the screen 700.

On the other hand, it is preferable that the light of the second wavelength is any one of red light, green light and blue light, and the light of the first and third wavelengths is light other than the light of the second wavelength.

That is, when the light of the second wavelength is red light, the light of the first and third wavelengths is green light and blue light.

3 is a block diagram of an embodiment of an illumination unit used in the optical system according to the present invention, and includes a lamp 110 for emitting white light; An integrator 120 for uniformizing the distribution of the white light emitted from the lamp 110; A color dividing unit (130) for time-dividing the white light uniformed by the integrator (120) into light having first and second wavelengths or light having second and third wavelengths; The polarization plate 160 is configured to polarize the light of the first and second wavelengths or the second and third wavelengths emitted from the color dividing unit 130.

The lighting unit emits white light from the lamp 110, and the emitted white light is transmitted to the color splitter 130 after the light distribution is uniform in the integrator 120.

Thereafter, the white light is time-divided and emitted by the light of the first and second wavelengths or the light of the second and third wavelengths in the color dividing unit 130, and only light having a specific polarization is emitted from the polarizer 160.

Here, the illumination lens 150 as shown in FIG. 3 may be provided between the color splitter 130 and the polarizer 160.

The installation of the polarizing plate 160 includes a function of polarizing incident light in order to transmit desired light to the rear stage and filtering of noise light.

As such, when the noise light is removed from the polarizer 160, contrast is enhanced in the image to be finally projected.

On the other hand, the configuration of the lighting unit of FIG. 3 is only one embodiment of the present invention, it can be implemented in various configurations and methods.

4A and 4B are conceptual views illustrating the function of the color divider used in the lighting unit according to the present invention. The color divider used in the lighting unit according to the present invention is a conventional color wheel as shown in FIG. 4A. 131 can be used, which is divided into a first color filter 131a for transmitting yellow light and a second color filter 131b for transmitting magenta light. have.

In this case, as shown in FIG. 4B, when the color wheel 131 is being rotated, the white light incident on the color wheel 131 passes through the first color filter 131a, and yellow light is emitted. After that, when the color wheel 131 is further rotated, magenta light is emitted through the second color filter 131b.

According to the above description, the color dividing part of the present invention is time-divisionally divided into yellow light and magenta light.

For reference, the yellow light is light in which red light and green light are synthesized, and the magenta light is light in which red light and blue light are synthesized.

That is, green and blue are time-divided and emitted.

5A through 5C are diagrams for explaining light time-division in the color splitter according to the present invention. First, as shown in FIG. 5A, the color filter 132a and the magenta for transmitting the yellow wheel to the yellow wheel are transmitted. (Magenta) When the color filter 132b which transmits light is divided and configured, the color wheel 132 is time-divided and emitted yellow light and magenta light.

As shown in FIG. 5B, when the color wheel 133 is configured by dividing the color filter 133a for transmitting magenta light and the color filter 133b for transmitting cyan light, the color wheel 133 is formed. ) Is time-divisionally divided by magenta light and cyan light.

5C, when the color wheel 134 is configured by dividing the color filter 134a for transmitting yellow light and the color filter 134b for transmitting cyan light, the color wheel 134 is formed. ) Is time-divided yellow light and cyan light.

Here, the cyan light is light in which blue light and green light are synthesized.

Therefore, the color dividing unit according to the present invention is time-divided by any one of yellow light and magenta light, magenta light and cyan light, and yellow light and cyan light. It is coming out.

At this time, in the color dividing unit, when the time is divided into the yellow light and the magenta light, the yellow light and the red light, which are red and green light, are synthesized. Magenta light, which is a light in which blue light is synthesized, is time-divisionally emitted.

Therefore, since the color dividing unit is time-divided into light of the first and second wavelengths or light of the second and third wavelengths, the light of the first and second wavelengths is red light and green light. The light of the second and third wavelengths becomes red light and green light.

Accordingly, the color dividing unit is time-divided into light in which red light and green light are synthesized or light in which red light and green light are synthesized.

FIG. 6 is a view for explaining an operation in which red light is emitted to the optical system of the projection display according to the present invention. As described above, the lamp 110, the color splitter 130, and the polarizer 160 may be an illumination unit. 100.

The white light emitted from the lamp 110 of the lighting unit 100 is time-divided into light of the first and second wavelengths or the second and third wavelengths in the color dividing unit 130.

That is, when the color splitter 130 is time-divided into yellow light and magenta light, yellow light or magenta light is emitted from 'A' of FIG. 6.

In this case, when yellow light is emitted from 'A' of FIG. 6, the polarizer 160 passes light of P or S wave, which is a specific polarization of yellow light.

If the polarizing plate 160 is a polarizing plate 160 that polarizes the light of the P wave, yellow light of the P wave is emitted at 'B' of FIG. 6.

Thereafter, the yellow light of the P-wave is red light included in the yellow light in the wavelength selective polarization converting unit 200 is converted to the S-wave red light in the 'C' of FIG. 6, the green light is polarized direction This is not converted and is emitted as P-wave green light.

Here, the P-wave green light will be described with reference to FIG. 7.

Then, the S-wave red light is reflected from the polarization beam splitter (PBS) surface 301 of the dichroic prism 300 and input to the first micro display 300. do.

The first micro display 300 modulates the input S-wave red light according to the gray level of image information, and outputs the modulated S-wave red light to a projection lens (not shown) through the dichroic prism 300. .

FIG. 7 is a view for explaining an operation in which green light or blue light is emitted to the optical system of the projection display according to the present invention. In the description of FIG. 6, the P-wave whose polarization direction is not converted in the wavelength selective polarization converter 200 is illustrated. The green light passes through the polarization beam splitter (PBS) surface 301 of the dichroic prism 300 and is input to the second micro display 500.

The second micro display 500 modulates the input P-wave green light according to the gray level of the image information, and outputs the modulated light to a projection lens (not shown) through the dichroic prism 300. .

8 is a spectral transmittance graph in the color splitter in the optical system according to the present invention, when magenta (Magenta) light is transmitted in the color splitter, the spectral transmittance graph is 'MA' in FIG. If yellow light is transmitted, the spectral transmittance graph is 'YE' and green and red light are transmitted.

9 is a spectral transmittance graph of yellow light before incident to a wavelength selective polarization transducer in an optical system according to the present invention, and is a spectral transmittance of P-wave yellow light polarized in a polarizing plate before incident to a wavelength selective polarization transducer. It is a graph.

That is, in 'B' of FIG. 6, P-wave yellow light, which is a synthetic light of green light and red light, is transmitted.

FIG. 10 is a spectral transmittance graph after yellow light passes through a wavelength selective polarization converting part in the optical system according to the present invention. In the wavelength selective polarization converting part, yellow light of P wave is represented by red light included in yellow light. The polarization direction is converted and emitted as S-wave red light in 'C' of FIG. 6 after passing through the wavelength selective polarization conversion unit, and the green light is emitted as P-wave green light because the polarization direction is not converted.

At this time, 'PG' in Fig. 10 is a spectral transmittance graph of P-wave green light after passing through the wavelength selective polarization converting unit.

11 is a graph of spectral transmittance of S-wave red light after passing through the wavelength selective polarization converting unit.

12 is a spectral transmittance graph before magenta light is incident to a wavelength selective polarization transducer in an optical system according to the present invention, and before magenta light is incident on a wavelength selective polarization transducer, magenta light is polarized. Since P wave magenta light is emitted, it is a spectral transmittance graph of this P wave magenta light.

From this spectral transmittance graph, it can be seen that magenta light, which is a synthetic light of blue light and red light, is emitted.

13 is a spectral transmittance graph after magenta light passes through a wavelength selective polarization converting part in the optical system according to the present invention. In the wavelength selective polarization converting part, magenta light of P wave is represented by red light included in magenta light. The polarization direction is converted and emitted as S-wave red light in 'C' of FIG. 6 after passing through the wavelength selective polarization conversion unit, and the blue light is emitted as P-wave blue light because the polarization direction is not converted.

Meanwhile, in FIG. 13, 'PB' is a spectral transmittance graph of P-wave blue light after passing through the wavelength selective polarization converting unit, and 'SR' in FIG. Is a graph of spectral transmittance.

15 is another configuration diagram of an optical system of a projection display according to the present invention, comprising: a white light source, time-divided and time-divided light of the white light source into first and second wavelengths or second and third wavelengths; An illumination unit 100 for polarizing and emitting the light; A wavelength selective polarization converting unit 210 for converting a polarization direction of light having a first wavelength and a third wavelength among light emitted from the illumination unit 100; A dichroic prism (310) for reflecting light of the first and third wavelengths of which the polarization direction is converted by the wavelength selective polarization converting unit (210) and transmitting the light of the second wavelength; A first micro display 410 which receives light having a second wavelength transmitted from the dichroic prism 310 and modulates the light according to a gray level of image information; A second micro display 510 which receives the light having the first and third wavelengths reflected by the dichroic prism 310 and modulates it according to the gray level of the image information and outputs the modulated light; And a projection lens 600 to enlarge and project the light modulated and output from the first and second micro displays 410 and 510 onto the screen 700.

Here, the lighting unit 100 includes a lamp 110 for emitting white light; An integrator 120 for uniformizing the distribution of the white light emitted from the lamp 110; A color dividing unit (130) for time-dividing the white light uniformed by the integrator (120) into light having first and second wavelengths or light having second and third wavelengths; The polarization plate 160 is configured to polarize the light of the first and second wavelengths or the second and third wavelengths emitted from the color dividing unit 130.

2 and 3, the illumination unit 100 of the optical system of the projection display divides the light of the white light source into light of the first and second wavelengths or the light of the second and third wavelengths, and polarizes the time-divided light. Let it out.

However, unlike the description of FIGS. 2 and 3, the wavelength selective polarization converting unit 210 converts the polarization directions of the light having the first and third wavelengths among the light emitted from the illumination unit 100.

The first and third wavelengths of which the polarization direction is converted by the wavelength selective polarization converter 210 are reflected by a dichroic prism 310 and input to the second micro display 510. The second micro display 510 receives light of the first and third wavelengths, modulates the light according to the gray level of the image information, and emits the light to the projection lens 600.

In addition, light of a second wavelength in which the polarization direction is not converted in the wavelength selective polarization converter 210 is transmitted through a dichroic prism 310 to be input to the first micro display 410. The first micro display 410 receives the light having the second wavelength and modulates the light according to the gray level of the image information and outputs the light to the projection lens 600.

As described above, the present invention time-divides the light of the light source, and some of the time-divided wavelengths of light are polarized and reflected by the optical part, thereby inputting to the first micro display, and the remaining light is transmitted through the optical part to the second micro display. In order to implement a dual reflection type projection system, the components can be simplified to reduce manufacturing costs, and can be made thinner and lighter.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (20)

  1. A lamp for emitting white light, a color splitter for time-dividing the white light emitted from the lamp into light of a first wavelength and a second wavelength or light of a second wavelength and a third wavelength; An illumination unit including a polarizing plate configured to receive and polarize light having first and second wavelengths or light having second and third wavelengths;
    A wavelength selective polarization converting unit for converting a polarization direction of light having a second wavelength among the light emitted from the lighting unit;
    A dichroic prism for reflecting light of the second wavelength whose polarization direction is converted by the wavelength selective polarization converting unit and transmitting light of the remaining wavelengths;
    A first micro display which receives light having a second wavelength reflected from the dichroic prism and modulates the light according to a gray level of image information;
    A second micro display configured to receive light having a first wavelength or a third wavelength transmitted from the dichroic prism and modulate the light according to a gray level of image information;
    And a projection lens to enlarge and project the light modulated and output from the first and second micro displays onto a screen.
  2. A lamp for emitting white light, a color splitter for time-dividing the white light emitted from the lamp into light of a first wavelength and a second wavelength or light of a second wavelength and a third wavelength; An illumination unit including a polarizing plate configured to receive and polarize light having first and second wavelengths or light having second and third wavelengths;
    A wavelength selective polarization converting unit converting polarization directions of light having a first wavelength and a third wavelength among light emitted from the illumination unit;
    A dichroic prism for reflecting light of the first and third wavelengths of which the polarization direction is converted in the wavelength selective polarization converting unit and transmitting the light of the second wavelength;
    A first micro display which receives light having a second wavelength transmitted through the dichroic prism and modulates the light according to a gray level of image information;
    A second micro display configured to receive light having the first and third wavelengths reflected from the dichroic prism and modulate the light according to the gray level of the image information;
    And a projection lens to enlarge and project the light modulated and output from the first and second micro displays onto a screen.
  3. delete
  4. The method according to claim 1 or 2,
    The light of the first and second wavelengths,
    Yellow light is a combination of green light and red light.
    The light of the second and third wavelengths,
    An optical system of a projection display, characterized in that the magenta light is a combination of red light and blue light.
  5. The method according to claim 1 or 2,
    The light of the first and second wavelengths,
    Yellow light, which is a combination of red light and green light,
    The light of the second and third wavelengths,
    An optical system of a projection display, wherein the green light and the blue light are cyan light.
  6. The method according to claim 1 or 2,
    The light of the first and second wavelengths,
    It is magenta light that red light and blue light are synthesized,
    The light of the second and third wavelengths,
    An optical system of a projection display, wherein blue light and green light are synthesized cyan light.
  7. The method according to claim 1 or 2,
    The light of the second wavelength is any one of red light, green light and blue light,
    The light of the first and third wavelengths is light other than the light of the second wavelength, the optical system of the projection display.
  8. The method according to claim 1 or 2,
    The wavelength selective polarization converter,
    An optical system of a projection display, characterized by converting a P wave (Primary wave) into a S wave (Secondary wave), or a S wave into a P wave.
  9. The method according to claim 1 or 2,
    The wavelength selective polarization converter,
    Optical system of a projection display, characterized in that it is a QWP (Quater wave plate).
  10. The method according to claim 1 or 2,
    The micro display,
    An optical system of a projection display, which is a liquid crystal on silicon (LCoS) panel that is a reflective LCD.
  11. The method of claim 1,
    And an integrator for uniformizing the distribution of the white light emitted from the lamp and outputting the same to the color dividing unit.
  12. The method of claim 1,
    The color splitter,
    An optical system of a projection display, characterized in that it is a color wheel.
  13. A lamp for emitting white light, a color dividing unit for time-dividing the white light emitted from the lamp into first or second synthetic light each containing light of a specific wavelength, and the color dividing unit An apparatus comprising a polarizing plate which receives and polarizes the first or second synthetic light emitted from the light;
    A first optical component for converting a polarization direction of light having a specific wavelength among light emitted from the device;
    A second optical component for reflecting light having a specific wavelength converted from the polarization direction emitted from the first optical component and transmitting the light having the remaining wavelength;
    A first panel which receives light having a specific wavelength reflected from the second optical component and modulates the light according to a gray level of image information;
    And a second panel configured to receive light having a wavelength transmitted from the second optical component and modulate the light according to the gray level of the image information.
  14. A lamp for emitting white light, a color dividing unit for time-dividing the white light emitted from the lamp into first or second synthetic light each containing light of a specific wavelength, and the color dividing unit An apparatus comprising a polarizing plate which receives and polarizes the first or second synthetic light emitted from the light;
    A first optical component for converting a polarization direction of light having a wavelength included in a pair of synthetic light except light having a specific wavelength among the light emitted from the device;
    A second optical component for reflecting light having a wavelength converted by the polarization direction emitted from the first optical component and transmitting light having a specific wavelength;
    A first panel which receives light having a wavelength reflected from the second optical component and modulates the light according to a gray level of image information;
    And a second panel which receives light having a specific wavelength transmitted from the second optical component and modulates the light according to the gray level of the image information.
  15. The method according to claim 13 or 14,
    The light of the specific wavelength,
    One of red light, green light and blue light,
    The pair of synthetic light,
    An optical system of a projection display, which is selected from among yellow light, magenta light, and cyan light.
  16. The method according to claim 13 or 14,
    In the first optical component, the light change direction is
    Optical system of a projection display, characterized in that the P wave (Primary wave) or S wave (Secondary wave).
  17. The method according to claim 13 or 14,
    The first optical component,
    Optical system of a projection display, characterized in that it is a QWP (Quater wave plate).
  18. The method according to claim 13 or 14,
    The second optical part,
    The polarization direction emitted from the first optical component is an optical component having a polarization beam splitter (PBS) surface that reflects the light of the converted wavelength and transmits light of a specific wavelength. Optical system of projection display.
  19. The method according to claim 13 or 14,
    The first and second panels,
    An optical system of a projection display, which is any one of a liquid crystal on silicon (LCoS) panel, a digital mirror device (DMD) panel, and a transmissive LCD panel.
  20. delete
KR1020050028125A 2005-04-04 2005-04-04 Optical system of projection display KR100686882B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020055381A (en) * 2000-12-28 2002-07-08 엘지전자 주식회사 Image Projector
KR20020064101A (en) * 2001-02-01 2002-08-07 엘지전자 주식회사 Optical system of liquid crystal projector
JP2004101826A (en) 2002-09-09 2004-04-02 Fuji Photo Optical Co Ltd Optical system for projector, and projector device using same
KR20040082393A (en) * 2002-01-28 2004-09-24 톰슨 라이센싱 소시에떼 아노님 Brighter light engine architecture for a liquid crystal display projection system
KR20040107298A (en) * 2003-06-13 2004-12-20 삼성전자주식회사 High efficiency projection system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020055381A (en) * 2000-12-28 2002-07-08 엘지전자 주식회사 Image Projector
KR20020064101A (en) * 2001-02-01 2002-08-07 엘지전자 주식회사 Optical system of liquid crystal projector
KR20040082393A (en) * 2002-01-28 2004-09-24 톰슨 라이센싱 소시에떼 아노님 Brighter light engine architecture for a liquid crystal display projection system
JP2004101826A (en) 2002-09-09 2004-04-02 Fuji Photo Optical Co Ltd Optical system for projector, and projector device using same
KR20040107298A (en) * 2003-06-13 2004-12-20 삼성전자주식회사 High efficiency projection system

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