JPS63185187A - Lcd projector device - Google Patents

Abstract

PURPOSE:To reduce the parts number of an expensive dichroic mirror by providing composite dichroic film formed the plural dichroic films of which dichroic characteristic are different on a common substrate. CONSTITUTION:The left half S1 and the right half S2 of the common glass substrate 13 of first and second composite dichroic mirrors 11 and 12 is respectively coated with coating of which characteristic is different. For example, the left half of the common glass substrate 13 of the second composite dichroic mirror 12 is coated with the coating 14 which reflects blue, the right half is coated with the coating 15 which reflects red. Then the left half composes the dichroic mirror which reflects blue and the right half composes the dichroic mirror which reflects red. The whole surface of the glass substrate 13 of the first composite dichroic mirror 11 is coated with the coating 14 which reflects blue and then, only the left half is coated again with the coating 15 which reflects red. Therefore, the right half composes the dichroic mirror which reflects blue and the left half composes the dichroic mirror which reflects blue and red.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention separates a video signal consisting of incident white light into three primary colors using a dichroic film, and then displays each color component on an LCD (liquid crystal display).
The present invention relates to an LCD projector device that projects a full-color image by modulating the color components using a play (liquid crystal display) and further synthesizing the modulated color components using a dichroic film.

[Prior Art] This type of LCD projector device separates incident white light into three primary colors using two spectroscopic dichroic mirrors with different properties, and then separates each color component into its respective L
It has been considered that a color component is modulated using a CD, and the modulated color components are combined using two combining dichroic mirrors with different properties and then projected.

FIG. 5 shows an example of this. Here, as a means to separate incident light A, which is white light, into three primary colors, red and blue color components R,
A first spectroscopic dichroic mirror 1 that reflects blue color component B and transmits green color component G; a second spectroscopic dichroic mirror 2 that reflects blue color component B of the reflected color components; A first synthesis dichroic mirror 3 that reflects color component B and a second synthesis dichroic mirror 4 that reflects red color component R are used. The second spectroscopic dichroic mirror 1.2 is
Total reflection mirrors 5.6 are disposed in parallel to each other on both sides thereof. Also, the first and second
The first and second combining dichroic mirrors 3 and 4 are arranged in the direction in which the spectroscopic dichroic mirrors l and 2 are extended, and the incident light A between the total reflection mirror 5 and the first combining dichroic mirror 3 is An LCD 7 is provided in a direction parallel to. Further, an LCD is installed between the first and second spectroscopic dichroic mirrors 1 and 2 in a direction perpendicular to the incident light A.
8 is provided between the second spectroscopic dichroic mirror 2 and the total reflection mirror 6 in a direction parallel to the incident light A.
9 is provided.

The incident light A enters the first spectroscopic dichroic mirror 1, the green color component G that has passed through the first spectroscopic dichroic mirror 1 passes through the total reflection mirror 5 and is sent to the LCD 7, and the other color components B and R are It is designed to be incident on LCD 8.9. Images of green, blue, and red color components are projected on each LCD 7.8.9, and this image is reflected on LCDs 7 and 8.
．． 9, each color component passing through the LCD 7.8.9 is modulated by the intensity of light.

The modulated color components G', B', and R' are again combined by the first and second combining dichroic mirrors 3.4. That is, the modulated green color component G'' is the first
When it passes through the second composition dichroic mirror 3, it is combined with the blue color component B', and when it passes through the second composition dichroic mirror 4, the red color component R' reflected by the total reflection mirror 6 is also combined. The lights are combined and output as full-color output light A', which is projected onto a screen by a projection lens (not shown).

Dichroic mirror for spectroscopy 1, 2, dichroic mirror for synthesis 3.4. The combination of total reflection mirrors 5, 6, etc. can be changed in various ways depending on the type of dichroic mirror, but in any case, two expensive dichroic mirrors are combined, one for spectroscopy and two for synthesis. Of course, it is disadvantageous in terms of cost since it requires four copies. Furthermore, since each dichroic mirror requires precise alignment and adjustment when attached, there is also the problem that a considerable amount of effort is required for assembly.

[Objective of the Invention] In order to improve such a problem, the object of the present invention is to focus on the fact that the spectroscopic dichroic mirror and the synthesis dichroic mirror are on the same surface, and to combine a plurality of dichroic mirrors located on the same surface. To provide an LCD projector device in which the number of expensive dichroic mirror parts is reduced by integrating mirrors, and alignment adjustment of the dichroic mirror during assembly is simplified.

[Summary of the Invention] The gist of the present invention to achieve the above-mentioned object is to separate incident white light into three primary colors using a dichroic film, modulate each light using an LCD, and transmit the modulated color components through the dichroic film. In an LCD projector device that projects a full-color image by combining the two images.

This is an LCD projector device characterized by comprising a composite dichroic film in which a plurality of dichroic films having different dichroic characteristics are formed on a common substrate.

[Embodiments of the Invention] The present invention will be described in detail based on embodiments illustrated in FIGS. 1 to 4.

FIG. 1 shows a configuration diagram of an LCD projector device according to the present invention, in which a first spectroscopy dichroic mirror 1 and a first synthesis dichroic mirror 3 located on the same plane in FIG. 5 are integrated. A second composite dichroic mirror that integrates the first composite dichroic mirror 11 that has been made into a single unit, and the second spectroscopic dichroic mirror 2 and the second synthesis dichroic mirror 4 that are also on the same plane in FIG. 12 is used, and all other components are the same as those in FIG.

They have the same sign.

The first composite dichroic mirror 11 and the second composite dichroic mirror 12 are provided on a common glass substrate 131, for example, as shown in FIG. For example, in the case of the second composite dichroic mirror 12, coatings with different properties are applied to the left half S1 and the right half S2.
As shown in the figure, a coating 14 that reflects blue is applied to the left half of a common glass substrate 13, a coating 15 that reflects red is applied to the right half, the left half is a dichroic mirror that reflects blue, and the right half is red. It consists of a dichroic mirror that reflects In the case of the first composite dichroic mirror 11, as shown in FIG. 4, a blue reflecting coating 14 is applied to the entire surface of the glass substrate 13, and then a red reflecting coating 15 is overlaid only on the left half. A dichroic mirror that reflects blue on the right half,
The left half consists of a dichroic mirror that reflects blue and red.

That is, the first composite dichroic mirror 11 has the functions of both the first spectroscopic dichroic mirror 1 and the first synthesis dichroic mirror 3 shown in FIG. Since it has the functions of both the second spectroscopy dichroic mirror 2 and the second synthesis dichroic mirror 4 shown in FIG. 5, the operating principle is exactly the same as that shown in FIG.

That is, in FIG. 1, the red color component R and the blue color component B of the incident light A are reflected by the left half of the first composite dichroic mirror 11, and the green color component G continues straight.
The light passes through the total reflection mirror 5 and enters the LCD 7. Also, the first
Of the red and blue color components reflected by the left half of the second composite dichroic mirror 11, the blue color component B is reflected by the left half of the second composite dichroic mirror 12 and enters the LCD 8. The component R goes straight and enters the LCD 9. The color components G', B'', and R are incident on the LCD 7.8°9 and modulated.

Of these, the color component G° is transmitted through the right half of the first composite dichroic mirror 11 and the right half of the second composite dichroic mirror 12. First composite dichroic mirror 1
1, it is combined with the blue color component B', and the second
When passing through the composite dichroic mirror 12, it is combined with the red color component R° reflected by the total reflection mirror 6, and the full-color output light A° is a composite of the three color components G', B', and R'. The image is then projected onto the screen by the projection lens.

Of course, in the embodiments described above, the red and blue characteristics of the dichroic mirror may be interchanged.

[Effects of the Invention] As explained above, the LCD projector device according to the present invention can reduce the cost significantly by using two expensive dichroic mirrors instead of four, which was conventionally required. can. Also, when assembling 1, 2
Since only the alignment adjustment of the dichroic mirrors is required, the adjustment is easy and the number of steps required for assembly can be reduced. Furthermore, because the alignment factor is reduced,
Another advantage is that quality is stable and product variations can be reduced.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the LCD projector device according to the present invention, and FIG. 1 is a configuration diagram, and FIG.
The figure is a perspective view of the composite dichroic mirror, Figure 3.
FIG. 4 is a partially enlarged view of a configuration example of a composite dichroic mirror, and FIG. 5 is a configuration diagram of another LCD projector device. Symbols 5 and 6 are total reflection mirrors, 7.8.9 is an LCD, and 11
．． 12 is a composite dichroic mirror, 13 is a glass substrate, and 14 and 15 are coatings. Patent applicant: Canon Co., Ltd.

Claims (1)

[Claims] 1. Separate incident white light into three primary colors using a dichroic film, modulate each light using an LCD, and synthesize the modulated color components using a dichroic film to create a full-color image. What is claimed is: 1. An LCD projector device for projecting images, comprising a composite dichroic film in which a plurality of dichroic films having different dichroic properties are formed on a common substrate. 2. The LCD projector according to claim 1, wherein the composite dichroic film has a coating that reflects one color component and a coating that reflects another color component provided in separate areas on the same substrate. Device. 3. The composite dichroic film is such that a coating that reflects one color component is applied to the entire surface of the same substrate, and a coating that reflects another color component is overlaid on a part of the same substrate. The LCD projector device described in .