KR100224902B1 - Reflection type project - Google Patents

Abstract

Disclosed is a reflection type project device that enables the use of light of both polarization components branched from a polarization beam splitter to improve light efficiency.

The disclosed reflective project apparatus includes a light source for generating and projecting light; A color wheel having a plurality of color filters selectively positioned on the optical path so as to selectively transmit the light incident from the light source side according to the wavelength, and a driving unit rotating the color filter; Light mixing means for diverging / converging or diffusely reflecting the light incident from the light source to become uniform light; A relay lens unit for condensing the light passing through the light mixing means to be parallel light; A polarization beam splitter which transmits and reflects incident light according to a polarization component to change a traveling path of the incident light; First and second condenser lens units disposed adjacent to each of the two exit surfaces of the polarizing beam splitter to focus and diverge the incident light, respectively, to reduce the width of the incident light; First and second display elements disposed adjacent to each of the first and second capacitor lens units and driven independently for each pixel to selectively change polarization components; A projection lens unit disposed adjacent to another exiting surface of the polarizing beam splitter to project the first and second capacitor lens units in the first and second display elements and the light incident through the polarizing beam splitter onto the screen; To; It is characterized by including.

Description

Reflective project device {Reflection type project}

The present invention relates to a reflective project apparatus using reflective image generating means, and more particularly, to a reflective project apparatus in which light of two polarization components branched from a polarizing beam splitter can be used to improve light efficiency.

Generally, a projector apparatus is an apparatus for providing an image by projecting an image generated by the image generating means onto a screen using a separate light source. This projector apparatus is classified into a transmissive type and a reflective type according to the form of the image generating means described above.

1 is a schematic view showing an optical arrangement of a conventional reflective projector device. As shown, a light source 10 for generating and irradiating light, a color wheel 20 for selectively transmitting a predetermined color of incident light, a scrambler 30 for mixing incident light to make uniform light, and a focusing lens ( 32), a collimating lens 34, a polarizing beam splitter 40 for converting the traveling path of incident light, a display element 50 for selectively reflecting incident light and an incident light screen (not shown) And a projection lens unit (60) for projecting on.

The light source 10 includes a lamp 11 such as metal halide and xenon that generate light, and a reflector 13 which reflects the light emitted from the lamp 11 and guides its progress. The color wheel 20 is rotatably installed by the driving motor 21 on the optical path between the light source 10 and the scrambler 30, and is red (R), green (G), and blue (B). ) The three-color color filter is divided equally throughout the wheel. The color wheel 20 rotates corresponding to the response speed of the display element described later, and any one of R, G, and B color filters is disposed on the optical path according to the response speed of the display element.

The scrambler 30 is made to be uniform light by mixing the incident light by the diffuse reflection. The focusing lens 32 focuses and diverges the light passing through the scrambler 30 to enlarge the transmission width of the light. The collimating lens 34 converges divergent light incident to be parallel light.

The polarizing beam splitter 40 is disposed on an optical path between the collimating lens 34 and the display element 50, and passes through and reflects the incident light on the mirror surface 41 according to the polarization component of the incident light. To convert That is, the light incident from the light source 10 is selectively transmitted or reflected depending on the polarization component, that is, P polarization or S polarization. 1 shows an example in which light transmitted through the polarization beam splitter 40 is used as effective light. As the display device 50, a ferroelectric liquid crystal display (FLCD) having excellent response speed characteristics having a two-dimensional array structure is employed. The display element 50 has a plurality of reflective regions of a two-dimensional array structure, and is driven independently to form an image by modulating the polarization direction of incident light.

Light incident on the display device 50 is reflected back to the polarizing beam splitter 40. In this case, the light re-injected into the polarization beam splitter 40 is changed by the display element 50 in the polarization direction by 90 degrees, and is totally reflected on the mirror surface 41 of the polarization beam splitter 40 so as to project the lens. To the unit (60). This light passes through the projection lens unit 60 and is projected onto a screen (not shown).

As described above, the conventional reflective projecting device has a problem that the light efficiency is lowered because only the light of one polarization component among the light branched from the polarizing beam splitter uses the effective light. In addition, when high accuracy parallelism is not secured with respect to incident light, transmission / reflection characteristics according to polarization components are deteriorated, so that alignment of the optical system for forming parallel light positioned between the light source and the polarizing beam splitter is difficult. have.

The present invention has been made in view of the above-described problems, and it is possible to use the light of both polarization components branched from the polarizing beam splitter to improve the light efficiency, and also has good parallelism to the polarizing beam splitter, that is, optical axis It is an object of the present invention to provide a reflective project device having a structure that is to be incident at a relatively parallel angle with the.

1 is a schematic view showing an optical arrangement of a conventional reflective project apparatus.

2 is a schematic view showing an optical arrangement of a reflective project apparatus according to an embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

110 Light source 111 Lamp 113 Reflector

120 ... color wheel 130 ... light mixing means 131 ... scrambler

140.Relay lens unit 141 Focusing lens

143 ... collimating lens 150 ... polarization beam splitter

160 Capacitor Lens Unit 161 Convergence Lens

163 ... first diverging lens 165 ... first display element

170 Condenser Lens Unit 171 Convergence Lens

173 2nd diverging lens 175 2nd display element 180 Projection lens unit

In order to achieve the above object, a reflective project device according to the present invention comprises: a light source for generating and projecting light; A color wheel having a plurality of color filters selectively positioned on the optical path so as to selectively transmit the light incident from the light source according to the wavelength, and a driving unit rotating the color filter; Light mixing means for diverging / converging or diffusely reflecting the light incident from the light source to be uniform light; A relay lens unit for condensing the light transmitted through the light mixing means to be parallel light; A polarization beam splitter which transmits and reflects incident light according to a polarization component to change a traveling path of the incident light; First and second condenser lens units disposed adjacent to each of the two exit surfaces of the polarizing beam splitter to focus and diverge the incident light, respectively, to reduce the width of the incident light; First and second display elements disposed adjacent to each of the first and second capacitor lens units and driven independently for each pixel to selectively change polarization components; Disposed adjacent to the other emission surface of the polarization beam splitter to project light incident on the screen through the polarization beam splitter and the first and second capacitor lens units respectively in the first and second display elements; A projection lens unit; It is characterized by including.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a reflective project device according to the present invention;

2 is a schematic view showing an optical arrangement of a reflective project apparatus according to an embodiment of the present invention.

As shown, the reflective project device of the present invention includes a light source 110, a color wheel 120 for selecting a color required for color image realization, and a light mixing to diverge / converge or diffuse the incident light to be uniform light. A relay lens unit 140 for converging the light transmitted through the means 130 and the light mixing means 130 to be parallel light and increasing the width thereof, and a polarizing beam splitter 140 for converting the traveling path of the incident light. ) And first and second capacitor lens units 160 and 170 for focusing and diverting incident light to reduce the width of the incident light, and first and second displays operating in pixel units to generate and reflect an image. Elements 165 and 175 and a projection lens unit 180 for projecting incident light onto a screen (not shown).

The light source 110 includes a lamp 111 for generating light and a reflector 113 for reflecting the light emitted from the lamp 111 and guiding a path of the light. The reflector 113 is an ellipsoidal mirror having the position of the lamp 111 as one focal point and the point where light is focused as another focal point, or the lamp 111 as the focal point and the lamp 111 as the focal point. It may be a parabolic mirror that is emitted from the light reflected by the reflector 113 is parallel light.

The color wheel 120 is disposed on the optical path between the light source 110 and the light mixing means 130, and the color wheel 120 on the optical path to selectively transmit light incident from the light source 110 according to the wavelength. Optionally positioned red (R), green (G), blue (B) tricolor color filter or yellow (Y), cyan (C), magenta (M) tricolor color filter, and a drive unit for rotating the color filter Include. The color filters are equally disposed throughout the wheel. The color wheel 120 rotates three times while one screen is formed on the screen (not shown), and any one of three color filters corresponds to the response speed of the display elements 165 and 175. It is disposed on the light path.

The light mixing means 130 is disposed on an optical path between the color wheel 120 and the relay lens unit 140, and uniform light is emitted by diverging / converging or diffusely reflecting the light incident from the light source 110. Be sure to As shown, it is preferable to employ a scrambler 131 that diffuses the incident light into the light mixing means 130 to be uniform light. The scrambler 131 is a rectangular parallelepiped glass having an entrance plane and an exit plane perpendicular to the optical path. In the exit surface 131a of the scrambler 131, the aspect ratio thereof is proportional to the aspect ratio of the display elements 165 and 175 described later.

The relay lens unit 140 focuses the light transmitted through the light mixing unit 130 to be parallel light, and collects the incident light 141, the focusing lens 141, and the polarization beam splitter. Collimating lens 143 disposed on the optical path between the 150 to focus the incident divergent light to be parallel light. Therefore, the light incident from the light source 110 is incident on the polarizing beam splitter 150 in parallel with a wider width. Therefore, since the incident light is generally perpendicular to the incident surface of the polarization beam splitter 150, light may be prevented from being scattered.

The polarization beam splitter 150 transmits and reflects the propagation path of the incident light on the mirror surface 151 according to the polarization component of the incident light. That is, the light incident from the light source 10 is selectively transmitted or reflected depending on the polarization component, that is, P polarization or S polarization. The light reflected by the polarization beam splitter 150 is directed toward the first condenser lens unit 160, and the light transmitted through the polarization beam splitter 160 is directed toward the second capacitor lens unit 170.

The first condenser lens unit 160 is disposed on an optical path between the polarizing beam splitter 150 and the first display element 165, and includes a first converging lens 161 for converging incident light and the first condenser lens unit 161. And a first diverging lens 163 that emits light directed toward the first display element 165 to match the size of the first display element 165. Accordingly, the light incident from the polarization beam splitter 150 and transmitted through the first capacitor lens unit 160 is parallel to the first display while the width thereof is reduced to match the size of the first display element 165. Is incident on element 165.

The first display element 175 may be a first ferroelectric liquid crystal display (hereinafter referred to as FLCD). The first FLCD is composed of hundreds of thousands of pixels or more, and the polarization direction can be modulated by a signal applied to each pixel, or the polarization direction can be rotated 90 degrees in time.

The second condenser lens unit 170 is disposed on an optical path between the polarization beam splitter 150 and the second display element 175, and includes a second converging lens 171 for converging incident light, and the second condenser lens unit 170. And a first diverging lens 173 for emitting light directed toward the second display element 175 to match the size of the second display element 175. Here, the role and optical arrangement of the second condenser lens unit 170 is substantially the same as the first condenser lens unit 160, and thus a detailed description thereof will be omitted. Since the second display element 175 is disposed adjacent to the second capacitor lens unit 170 and has substantially the same optical configuration as the first display element 165, a detailed description thereof will be omitted.

Light whose polarization direction is selectively changed with respect to each pixel by a signal applied among the light reflected by the first display element 165 passes through the first condenser lens unit 160 and the polarization beam splitter 150 It passes through the mirror surface 151 and faces in the direction of the projection lens unit 180. In addition, light whose polarization direction is selectively changed with respect to each pixel by a signal applied among the light reflected by the second display element 175 passes through the second capacitor lens unit 170 and the polarization beam splitter 150. Reflected from the mirror surface 151 of FIG. 2), the light is directed toward the projection lens unit 180.

The projection lens unit 180 is disposed between the polarizing beam splitter 150 and a screen (not shown), and overlapped light incident from the first and second display elements 165 and 175 corresponds to the screen. The image is enlarged and projected so as to be directed to a screen (not shown).

Hereinafter, the operation of the reflective project apparatus according to the embodiment of the present invention will be described.

The light irradiated from the light source 110 passes through the color filter 120, and the color is selected. Incident. The relay lens unit 140 enlarges the width of the incident light and makes parallel light. This parallel light is incident on the polarization beam splitter 150. Light incident on the polarization beam splitter 150 is branched according to the polarization component at the mirror surface 151 and transmitted or reflected. The light of one polarization reflected by the polarization beam splitter 151 is incident on the first display element 165 via the first capacitor lens unit 160 and of the other polarization transmitted through the polarization beam splitter 151. Light is incident on the second display element 175 via the second capacitor lens unit 170. Each of the first and second display elements 165 and 175 has a plurality of pixels having a two-dimensional array structure, and the first and second condenser lens units are determined with the polarization direction determined according to the driving signal for each pixel. 160 and 170 are reflected back to the polarizing beam splitter 150. The polarization beam splitter 150 transmits or reflects light according to the polarization component of each incident light of the two incident lights to overlap the light directed toward the projection lens unit 180. This superimposed light is simultaneously projected onto a screen (not shown) via the projection lens unit 180.

As described above, the reflective project apparatus according to the embodiment of the present invention can increase the amount of light by using all the light of each polarization component branched from the polarization beam splitter as the effective light. In addition, by employing a relay lens unit, the parallelism of light can be increased by increasing the width of light incident on the polarizing beam splitter.

Claims (7)

A light source for generating and projecting light; A color wheel having a plurality of color filters selectively positioned on the optical path so as to selectively transmit the light incident from the light source according to the wavelength, and a driving unit rotating the color filter; Light mixing means for diverging / converging or diffusely reflecting the light incident from the light source to be uniform light; A relay lens unit for condensing the light transmitted through the light mixing means to be parallel light; A polarization beam splitter which transmits and reflects incident light according to a polarization component to change a traveling path of the incident light; First and second condenser lens units disposed adjacent to each of the two exit surfaces of the polarizing beam splitter to focus and diverge the incident light, respectively, to reduce the width of the incident light; First and second reflective display elements disposed adjacent to each of the first and second capacitor lens units and driven independently for each pixel to selectively change polarization components; Disposed adjacent to the other exiting surface of the polarizing beam splitter, the light incident through the polarizing beam splitter and the first and second condenser lens units in the first and second reflective display elements, respectively, to the screen; A projection lens unit for projecting; Reflective project device, characterized in that included. The reflective project apparatus according to claim 1, wherein the light mixing means is a rectangular parallelepiped scrambler having a glass having an incident surface and an exit surface perpendicular to the optical path so that the incident light is diffusely reflected to become uniform light. 2. The relay lens unit of claim 1, wherein the relay lens unit focuses parallel to the focusing lens for emitting light transmitted through the light mixing means, and the diverging light incident on the optical path between the focusing lens and the polarizing beam splitter. Reflective project device, characterized in that it comprises a collimating lens to be light. 2. The first ferroelectric liquid crystal display of claim 1, wherein the first display element is a linearly polarized light having a polarization direction independently selected according to each region of the light incident through the first capacitor lens unit. Reflective project device, characterized in that it comprises a. 2. The second ferroelectric liquid crystal display device of claim 1, wherein the second display element is a linearly polarized light having a polarization direction independently selected for each region of the incident light via the second capacitor lens unit, and reflects it. Reflective project device, characterized in that it comprises a. 2. The first condenser lens unit of claim 1, wherein the first condenser lens unit is disposed on an optical path between the polarizing beam splitter and the first reflective display element to converge incident light. And a first diverging lens disposed between the first reflective display elements to emit light directed toward the first reflective display element so as to match the size of the first reflective display element. . The second condenser lens unit of claim 1, wherein the second condenser lens unit is disposed on an optical path between the polarizing beam splitter and the second reflective display element to converge incident light; And a second diverging lens disposed between the second reflective display elements to emit light directed to the second reflective display element so as to match the size of the second reflective display element. .

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