KR960003746Y1 - L.c.d. projector - Google Patents

Abstract

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Description

Optical system of LCD projector

1 is a block diagram of a conventional liquid crystal projector optical system.

2 is a structural diagram of a liquid crystal panel.

FIG. 3 is an enlarged view showing an appealing part in the liquid crystal panel of FIG.

4 is a configuration diagram of the liquid crystal projector optical system of the present invention.

Figure 5 is a front view for explaining the principle of the engineering structure capable of special filtering applied to the present invention.

6 is a perspective view of FIG.

Model diagram of a light blocking mask located on the transform plane of FIG. 7 to enable special filtering.

A and b of FIG. 8 show changes in the image plane before and after the special filtering, and a is a state diagram before implementation.

b is a state diagram after implementation.

* Explanation of symbols for main parts of the drawings

11-1, 11-2, 11-3: light source 12-1, 12-2, 12-3: reflector

13 ', 13', 13 '': Pinhole 13-1, 13-2, 13-3: Condensing member

14-1, 14-2, 14-3: condenser lens 15-1, 15-2, 15-3: image forming unit

16: color synthesis system 16a, 16b: launch surface

17: special filtering device 18: projection lens

19: screen

The present invention relates to an optical system of a liquid crystal projector (PROJECTOR), in particular, by installing a special filtering (Spatial filtering) using a diffraction effect of the light in a certain portion of the front of the liquid crystal panel non-uniformity of the screen caused by the partition wall It relates to an optical system of a liquid crystal projector in which one condition is improved.

As shown in FIG. 1, the optical system of the conventional liquid crystal projector includes a light source 1, a reflector 2 reflecting light reflecting light emitted from the light source 1, and a reflector 2; Ultraviolet / infrared cutting filter (3) to remove the infrared / infrared rays of the light reflected from, and the light passing through the ultraviolet / infrared cutting filter (3). blue. A color separation system 4 having color selection reflecting surfaces 4a and 4b separating into green, and reflectors 5 for conveying light of each path separated and reflected by the color separation system 4 by 45 °. An image forming unit 6 through which light reflected from the reflector 5, 5 ', 5', and 5 'is passed. And a color combining system 7 having color-selective reflecting surfaces 7a and 7b through which light transmitted from the image forming unit 6 is incident, and a projection lens through which light reflected from the color combining system 7 passes. 8) and a screen 9 on which the light projected on the projection lens 8 is projected.

The image forming unit 6 is positioned in front of the color synthesis system 7 and is adapted to red, blue, and green separated from the color separation system 4 (6-1), 6-2, and 6 Each is divided into -3).

In the optical system of the liquid crystal projector configured as described above, an image formed by the chemical forming units 6-1, 6-2, and 6-3 is synthesized by the color synthesis system 7, and passes through the projection lens 8 to screen (9) is enlarged projection, wherein the image projected on the screen (9) is enlarged projection in the same shape as the image displayed on the image forming section (6-1) (6-2) (6-3) do.

However, conventionally, as shown in Figs. 2 and 3, in a matrix type image forming element, particularly in an active matrix type liquid crystal display device, a driving signal line for supplying a driving voltage to each pixel is a pixel. It is wired between (10) and the pixel, which is provided with a gate bus line (G) and a source bus line (S) as electrodes in a horizontal and vertical direction, and TFTs (T) are provided at the points of the two lines (B) and (S). Since the pixel electrode is connected to the drain shaft, the ratio of the pixel area in the screen is limited in the entire screen. When the LCD screen is viewed, the areas other than the appeal cannot pass through the light. An image with a wall corresponding to an area which cannot be made is formed.

Therefore, in the related art, the barrier rib structure of the LCD screen is enlarged and projected on the screen, thereby exhibiting an inhomogeneous property of the image, and thus causing a large obstacle in improving the quality of the screen.

An object of the present invention is to improve the non-uniform state of the screen generated by the liquid crystal panel barrier by eliminating the non-uniformity caused by the liquid crystal panel barrier ribs with a special filtering device using the rotation effect of light.

In order to achieve the object of the present invention, a light source for emitting monochromatic light in the red, blue, and green areas, a reflector installed on each right side of the light source and reflecting light, and a pinhole for injecting light reflected from the reflector in parallel A condensing member having a condensing member, a condensing lens, an image forming unit for forming an image of red and blue green, a color synthesis system for forming a full color by combining images formed from the image forming unit, and the color synthesis system. And a special filtering device for removing a partition of an image element passing therethrough, a projection lens for magnifying and projecting an image from which the partition is removed in the special filtering device, and a screen on which an image to be enlarged and projected by the projection lens is formed. An optical system of a liquid crystal projector, a light source for emitting monochromatic light in red, blue and yellow regions, and a rear side of the light source A light collecting member having a reflector reflecting light and a pinhole for incident light reflected from the reflector in parallel, a light collecting lens, an image forming unit for forming an image of red, blue, and green, and light incident from the image forming unit. A color synthesis system having a dichroic coated reflecting surface to be synthesized and projected, a special filtering device for removing partitions of an image element passing through the color synthesis system, and an enlarged projection of an image from which the partition wall is removed by the special filtering device An optical system of a liquid crystal projector is provided, which comprises a projection lens and a screen on which an image is enlarged and projected from the projection lens.

Hereinafter, the present invention as described above will be described in detail by the accompanying drawings.

4 is a schematic view of the liquid crystal projector optical system of the present invention, and FIGS. 5 and 6 are front and perspective views for explaining the principle of an optical structure capable of special filtering applied to the present invention, and FIG. It is a schematic diagram of the light shielding mask which enables special filtering, and a, b of FIG. 8 is a state diagram which showed the change in the upper surface before and behind special filtering.

As shown in the drawing, the optical system of the liquid crystal projector of the present invention includes light sources 11-1, 11-2, and 11-3 that emit monochromatic light in red, blue, and green regions, and the light sources 11-1 and 11, respectively. Reflectors 12-1, 12-2, 12-3 provided on the rear side of each of -2) 11-3, and reflecting light, and the reflectors 12-1, 12-2, 12 Condensing members 13-1, 13-2, 13-3 and condensing lens 14 having pinholes 13 '(13') and 13 '' for inciding light reflected from -3 in parallel. -1) 14-2, 14-3, image forming units 15-1, 15-2, 15-3 for forming images of red, blue, and green, and the image forming unit 15 -1) (15-2) (15-3) synthesizes the light incident from the light color to form a full color (Full Color) to reflect the color synthesis system having a dichroic coating of the reflecting surface (16a, 16b) (16), a special filtering device (17) for removing partitions of the image elements passing through the color synthesis system (16), and an enlarged projection of an image from which the partitions have been removed from the special filtering device (17). It consists of a projection lens 18 and a screen 19 which is the image to be enlarged and projected formed in the projection lens 18.

The optical system of the liquid crystal projector according to the present invention configured as described above prevents the barrier rib structure of the liquid crystal screen from being projected on the screen by the special filtering device 17. The principle of the optical structure to enable special filtering will be described in detail with reference to FIGS. 5 to 8.

First, as shown in FIG. 5 and FIG. 6, parallel light passing through the matrix-shaped image plane F1 of the image element causes a diffraction effect, so that an image forming surface is formed on the front and rear focal planes of the lens L1. With the conversion plane F1 'and the change plane F1' = F2 'placed on the front and rear focal planes of the lens L2, the image forming unit and the image forming unit are arranged on the rear focal plane F2 of the lens L2. Image of one correspondence is reimaged. At this time, the diffracted light of the image forming part appears on the change surface, the zero-order diffracted light appears on D0 of the change surface, and the first diffracted light is imaged on D1 and D-1.

Therefore, when the light shielding mask as shown in FIG. 7 is provided on the conversion surface, the high frequency component representing the gratings of the image elements is removed so that the smooth image with the grating removed as shown in FIG. Then, if the magnification is projected through the projection lens, a high quality image can be realized.

Here, the principle of the special filtering device 17 will be described in more detail.

For example, as shown in FIG. 5, the lens L1 is positioned between the object plane F1 and the image plane F2 without the mask provided on the conversion planes F1 'and F2', and the lens L1 is positioned on the object plane F1. When the right focus is provided with the lens L2 positioned on the image plane F2 and the right focus of the lens L1 and the left focus of the lens L2 are arranged to coincide on the conversion planes F1 'and F2'. The image of the object plane can be seen as it is in the image plane F2. At this time, the barrier rib structure as described above is displayed on the image plane and the image quality is deteriorated.

As shown in FIG. 6, the special filtering device prevents the partition structure from appearing on the image surface F2 by providing the mask M on the change surfaces F1 'and F2'.

Here, when a hole is formed in the mask M, but the hole is formed small in size so that the 0th-order diffracted light can pass through, the first or more light other than the 0th-order diffracted light is blocked and the image plane ( In F2), no image is formed.

Next, assuming that a plurality of holes are formed in the mask M in the vertical direction, the mask M has a maxima extending in the vertical direction, which is the horizontal plane of the object plane F1. This is caused by the diffraction generated at, resulting in only the horizontal portion of the partition appearing on the image surface F2.

In the present invention, by forming a plurality of holes coincident with the maxima in the mask M described above, the maxima extending in the vertical and horizontal directions are blocked to form an image in which the image plane F2 has been removed in the vertical and horizontal directions. Will be.

In the above embodiments, an example in which three light sources emit monochromatic light has been described. However, the present invention is not necessarily limited thereto, and one light source emitting multicolor light may be used.

As described above, in the optical system of the liquid crystal projector according to the present invention, a special filtering device using a diffraction effect of light is installed at a predetermined portion in front of the liquid crystal panel to remove the uneven state of the screen caused by the partition wall of the liquid crystal panel. It is effective, so that the liquid crystal projector can be applied to a projector apparatus generally constructed by using a matrix type display element.

Claims (2)

(Correction) The light source 11, the reflector 12 which is provided in the rear of the said light source 11, and reflects light, and the light condensing structure 13 and 14 which injects the light reflected from the reflector 2 in parallel. ), A matrix type image forming unit 15 for forming an image, a color synthesis system 16 for forming a full color by combining images formed from the image forming unit, and the image forming unit 15 A special filtering device 17 for removing a partition of an image element, a projection lens 18 for magnifying and projecting an image from which the partition is removed by the special filtering device 17, and an image projected and enlarged by the projection lens 18 The optical system of the liquid crystal projector characterized by consisting of the screen 19 is formed. (Correction) rear sides of the light sources 11-1, 11-2, 11-3 and the light sources 11-1, 11-2, 11-3 that emit monochromatic light in the red, blue, and green regions, respectively. Reflection mirrors 12-1, 12-2, 12-3, which are installed at and reflect light, and light reflected from the reflection mirrors 12-1, 12-2, 12-3 in parallel Condensing members 13-1, 13-2, 13-3, and condenser lenses 14-1, 14-2, 14 having pinholes 13 ', 13', and 13 '. -3), and image forming units 15-1, 15-2, 15-3 for forming images of red, blue, and green, and the image forming units 15-1, 15-2, and 15 -3) by combining the light incident from the projections, the color synthesis system 16, in which the reflecting surfaces 16a and 16b are subjected to dichroic coating, and the partition wall of the image element passing through the color synthesis system 16, A special filtering device 17 for removing the projection lens, a projection lens 18 for magnifying and projecting an image from which the partition wall is removed from the special filtering device 17, and a screen on which an image to be enlarged and projected on the projection lens 18 is formed; Composed of 19) Optical system of the liquid crystal projector, characterized in that.