KR0170984B1 - Optical system for projector - Google Patents

Abstract

According to the present invention, a three-color dichroic color filter is installed at the source stop and the projection stop, and the tilt angles of the mirror arrays of the optical path controllers are configured differently to simplify the manufacture of the device and reduce the noise of the image signal. An optical system of a display device includes a light source 11 emitting high brightness white light, a source lens 12 focusing the light emitted from the light source 11, and the source lens 12. A reflection mirror 14 for reflecting light transmitted through the source stop 23 and a light path controller for adjusting an optical path to correspond to pixels according to a predetermined signal. 40, a projection stop 25 through which the optical path is adjusted from the optical path controller 40 to transmit incident light, and a projection lens 16 to project the transmitted light transmitted through the projection stop 25 onto a screen. Configuration In the optical system of the projection image display apparatus, the source stop 23 and the projection stop 25 are provided with three-color dichroic filters 32 and 34, respectively, and the optical path controller 40 includes a mirror array thereof. 42c, 44c, and 46c are installed to reflect red, green, and blue light at different angles.

Description

Optical system of projection image display device

1 is a plan view schematically showing an optical system of a conventional general projection image display device.

2 (a) and (b) are perspective views showing the source stop and the projection stop of the optical system of the projection image display device according to the present invention.

3 (a) and 3 (b) show an optical path controller and a mirror array of an optical system of a projection image display device according to the present invention.

* Explanation of symbols for main parts of the drawings

10: projection image display device 23: source stop

14 reflection mirror 16 projection lens

25: projection stop 40: optical path controller

42c, 44c, 46c: red, green and blue mirror array

The present invention relates to an optical system of a projection image display apparatus, and more particularly, by installing a three-color dichroic color filter at a source stop and a projection stop, and configuring the tilting angle of each mirror array of an optical path controller differently. The present invention relates to an optical system of a projection image display device, which facilitates fabrication of a device and reduces noises of an image signal.

An image display apparatus is classified into a direct image display apparatus and a projection image display apparatus according to a display method.

The direct view type image display device includes a CRT (Cathode Ray Tube), but the CRT image display device has good image quality but has a problem such as an increase in weight and thickness as the screen is enlarged, and a price is expensive. There is.

Projection type image display devices include a large crystal display (hereinafter referred to as an LCD), and such a large screen LCD can be thinned to reduce the weight. However, the LCD has a high light loss due to the polarizing plate, and a thin film transistor for driving the LCD is formed for each pixel, so that there is a limit in increasing the aperture ratio (light transmission area).

Accordingly, a projection image display device using Actuated Mirror Arrays (hereinafter referred to as AMA) has been developed by Aura, USA.

The projection image display device is divided into one-dimensional AMA and two-dimensional AMA. The one-dimensional AMA has mirror surfaces arranged in an M × 1 array, and the two-dimensional AMA has mirror surfaces arranged in an M × N array. Therefore, a projection image display device using a 1D AMA pre-scans M × 1 rays using a scanning mirror, and a projection image display device using a 2D AMA projects M × N beams to produce an array of M × N pixels. Branches represent images.

FIG. 1 is a plan view schematically showing an optical system of a projection image display device including an optical path controller using a conventional AMA. As shown in FIG. 1, the projection image display device 10 includes a mandrel 11 and a source lens 12. And a source stop 13, a reflection mirror 14, a projection stop 15, a projection lens 16, a micro color filter 17, and an optical path controller 20.

The light source 11 emits high brightness white light, and the light emitted from the light source 11 is focused by the source lens 12 to pass through the source stop 13 and to the reflective mirror 14. Is reflected by.

The optical path controller 20 includes a mirror 20c that reflects a path of light to correspond to pixels incident from the reflective mirror 14, and an actuator 20b that allows the mirror 20c to have a predetermined path. It consists of the actuated mirror array panel 20a in which MxN pieces were mounted. The actuated mirror array panel 20a includes M × N transistors (not shown), and the actuator 20b is mounted on the actuated mirror array panel 20a so as to be electrically connected to the transistors. Deformed by the electric field generated by the image signal, the mirror 20c mounted on the top is inclined by a predetermined angle.

The projection lens 16 implements a color image by projecting the light amount adjusted by the optical path controller 20 and color separated by the micro color filter 17 and passing through the projection stop 15 onto the screen. .

In the conventional projection image display device configured as described above, in order to implement color, a micro color filter 17 must be installed in front of the optical path controller 20. The micro color filter 17 is a mirror of the optical path controller 20. Since the same number of pixels of the array should be manufactured, the manufacturing cost is expensive, and the installation of the optical path controller 20 has to be provided at intervals of several tens of micrometers.

The present invention has been made to solve the problems in the optical system of the conventional projection-type image display device as described above, it is possible to implement the color by installing a color filter in the source stop and projection stop and adjust the tilt angle of the optical path controller differently. It is an object of the present invention to provide an optical system of a projection image display device which is designed to simplify the installation of the device.

According to a preferred embodiment of the present invention to achieve the above object, a light source for emitting high brightness white light, a source lens for focusing the light emitted from the light source, and a source stop is focused by the source lens A reflection mirror for reflecting the transmitted light, an optical path adjuster for adjusting the optical path to reflect the reflected light reflected from the reflective mirror according to a predetermined signal, and a projection stop for projecting light incident by adjusting the optical path from the optical path controller. And an optical system of a projection-type image display device configured to project transmitted light transmitted through the projection stop onto a screen, wherein the source stop projects the light from the light source into red, green, and blue light separately in its transmission hole. The tricolor dichroic filter is attached to make it possible, and the optical path controller has its mirror The ray is installed to reflect red, green and blue light at different angles, and the projection stop is a three-color dichro to project red, green and blue light reflected by each mirror array of the optical path controller. Provided is an optical system of a projection image display device, wherein the color filter is adhesively installed.

According to the embodiment of the present invention configured as described above, the light source radiated from the light source is separated into red, green and blue fields by the source stop and reflected to the optical path controller. Each mirror array of the optical path controller has a different angle of red, By reflecting the blue and green light and then the red, green and blue light is transmitted by the projection stop and projected on the screen through the projection lens to obtain a predetermined image information.

Hereinafter, an optical system of a projection image display device according to the present invention will be described in detail with reference to the accompanying drawings.

2 (a) and 2 (b) show a source stop and a projection stop in the optical system of the projection image display device according to the present invention. As shown therein, the source stop 23 according to the present invention is initially shown. A three-color dichroic color filter 32 is attached to the transmission hole 23a so as to separate the red, green, and blue light components from the high luminance white light emitted from the light source 11.

In addition, the projection stop 25 is reflected from each mirror array of the optical path controller 40, the three-color dichroic in the transmission hole (25a) so as to separate and transmit the red, green and blue light components of the angle is adjusted, respectively. Color filter 34 is adhesively installed.

Also, as shown in (a) and (b) of FIG. 2, the projection stop (when the horizontal to vertical ratio of the size of the three-color dichroic color filter 32 of the source stop 23 is a: b). The ratio of width to length of the size of the three-color dichroic color filter 34 of 25) is set to 3a: b.

3 (a) and 3 (b) are schematic diagrams showing an optical path controller in the projection image display device according to the present invention. As shown therein, the optical path controller 40 has red, green and The blue mirror arrays 42c, 44c, and 46c are formed in a stripe shape, and the mirror arrays 42c, 44c, and 46c each have blue, green, and red light transmitted from the source stop 23 to form an optical path. They are installed with different angles of reflection so that they can be reflected and projected to the projection stop 25. That is, each of the mirror arrays 42c, 44c, and 46c has an initial driving voltage such that the angles of reflection have 0 °, θ, and 2θ. Is set.

The operation in the optical system of the projection image display device according to the present invention configured as described above is as follows.

First, high brightness white light is emitted from the light source 11, and then separated into red, green, and blue light while passing through the source stop 23 to reach each mirror array 42c, 44c, 46c of the optical path controller 40. Each mirror array 42c, 44c, 46c of the optical path controller 40 is tilted at different angles according to the image information to reflect red, green, and blue light. Then, the light reflected from each mirror array 42c, 44c, 46c of the optical path controller 40 passes through the projection stop 25 to implement a color image on the screen through the projection lens 16.

According to the projection image display device configured as in the above embodiment, since the micro color filter that is to be installed on the front of the optical path controller is unnecessary to realize the conventional color, the manufacturing of the device is simplified and the noise generation of the image information is eliminated. It is effective.

Although the present invention has been described and illustrated with reference to the preferred embodiments, those skilled in the art will be capable of various modifications without departing from the gist of the present invention.

Claims (2)

A light source 11 emitting high luminance white light, a source lens 12 condensing the light emitted from the light source 11, and light focused by the source lens 12 and transmitted through the source stop 23. A reflection mirror 14 for reflecting the light, an optical path controller 40 for adjusting an optical path so that the reflected light reflected from the reflection mirror 14 corresponds to a pixel according to a predetermined signal, and an optical path from the optical path controller 40. In the optical system of a projection image display device, the source stop 23 comprises a projection stop 25 for transmitting incident light and a projection lens 16 for projecting the transmitted light transmitted through the projection stop 25 onto a screen. The three-color dichroic filter 32 is attached to each of the transmission holes so that the light from the light source can be separated and projected into red, green and blue light, and the optical path controller 40 has its mirror array ( 42c, 44c, 46c) are red, green and blue It is provided to reflect the field at different angles, and the projection stop 25 projects the red, green, and blue light reflected by the mirror arrays 42c, 44c, and 46c of the optical path controller 40, respectively. Optical system of a projection-type image display device, characterized in that the three-color dichroic color filter (34) is adhesively installed. The three-color dichroic color of the projection stop 25 according to claim 1, wherein the three-color dichroic color filter 32 of the source stop 23 is provided with a: b. The optical system of the projection image display device, characterized in that the width of the filter 34 is set to 3a: b.