JPH01209482A - Liquid crystal image projecting mechanism - Google Patents

Abstract

PURPOSE:To project clear, enlarged images without distortion by additionally providing the front surface of a liquid crystal with a condenser and the back surface with a total reflection mirror. CONSTITUTION:A light source 2 possessing a reflection mirror 3 and a condenser 4 lens is arranged in the front side part of the liquid crystal panel 1. The front side of the liquid crystal panel 1 is additionally provided with the condenser 5' of the semi-convex lens. The back surface is additionally provided with the appropriate total reflection mirror 8 without the condenser and the effective space is additionally provided with a liquid cooling device 9 with a space. A front specified distance position is provided with a screen 7 and a projecting lens 6 is inserted between the screen 7 and the condenser 5'. The back part of the liquid crystal panel 1 is additionally provided with the total reflection mirror 8, therefore, image information is picked up in double by transmitting light. In addition, transmitting light are parallel light beams. Thus, clear images without distortion can be projected on the screen 7.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the technical field of the mechanism of a device that enlarges and projects a colored image formed on a liquid crystal panel onto a screen.

Summary of the gist> The invention of this application is a liquid crystal image projection system in which a liquid crystal panel for image formation connected to an electronic driving device is interposed between a light source such as a halogen lamp and a projection lens for a screen. This invention relates to a mechanism, and in particular, a condensing lens such as a Fresnel lens is attached to the front surface of a liquid crystal panel having a cooling device on the screen side, while a total reflection mirror is attached to the back surface. This invention relates to a liquid crystal image projection mechanism in which a polarizing beam splitter and a dichroic prism are attached in front of a condensing lens.

<Prior Art> As is well known, the recent information society owes much to the development of electronic optics, as exemplified by the so-called 0-AI device.
Image processing such as graphs and videos has made an extremely large contribution to the means of information transmission. Through advanced research and development of technology, the light transmittance of the liquid crystal panel allows color images formed on the liquid crystal panel by an electronic drive device etc. to be enlarged and projected onto the screen.
Information is transmitted to an unspecified number of viewers, and in recent years, high-intensity screens or so-called high-definition screens have been used to project clear, enlarged images with good contrast onto screens to perform highly accurate information transmission processing. ing.

The transmission of such a large amount of high-precision image information is largely dependent on the physical characteristics of the liquid crystal panel, but as mentioned above, it is possible to display a high-precision enlarged image with good contrast, clarity, and brightness on the screen. In order to project high-definition images onto LCD panels, the light that passes through the LCD panel must be parallel rays perpendicular from the incident side to the output side. There are problems such as the occurrence of images and poor contrast.

Furthermore, regarding the emitted light beam, it is necessary to concentrate as much light as possible to the projection lens for forming an enlarged image on the screen. In the prior art, for example, as shown in FIG. 6, light from a light source 2 such as a halogen lamp set behind a liquid crystal panel 1 is reflected to the rear side of the liquid crystal panel 1 by a reflecting mirror 4 and a condenser lens 3. A parallel light beam is made incident on the liquid crystal panel 1 through a condensing lens 5 provided, and is outputted as a parallel light beam with image information formed by a predetermined electronic drive device (not shown), and is projected by a front condensing lens 5'. The lens 6 is narrowed down to project an enlarged image onto the screen 7,
Alternatively, as shown in FIG. 7, a Fresnel lens 5' is arranged as a condensing lens on the rear side of the liquid crystal panel 1 to make the emitted light rays parallel to the liquid crystal panel 1 and narrow the light to the projection lens 6. was aiming for

<Problems to be Solved by the Invention> However, in the conventional liquid crystal image projection mechanism as shown in Figure 7.3, the liquid crystal panel 1
It is necessary to attach a pair of condensing lenses before and after the LCD panel. Therefore, the structure becomes even more complicated because the condensing lens is attached in addition to the precise and complicated liquid crystal panel drive mechanism. This makes maintenance, inspection and maintenance extremely cumbersome, and in addition, the optical path becomes long, which naturally increases the size of the entire mechanism, which is disadvantageous in terms of operability and economy. The disadvantage is that a large cooling device is required to prevent temperature rise, which is a major obstacle to the operation of the liquid crystal panel, due to the narrowing of the light by the condensing lens used in the liquid crystal panel.

<Object of the Invention> The object of the invention of this application is to solve the problem of image projection on a screen using a liquid crystal panel having the advantage of light transmittance of liquid crystal based on the above-mentioned prior art, and to solve the problem of the device structure. While being compact and economical without being complicated,
It is an object of the present invention to provide an excellent liquid crystal image projection mechanism that can form a clear image with high definition, brightness, and good contrast on a screen, thereby benefiting the field of image transmission processing technology in the information industry.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the invention of this application, which is based on the scope of the above-mentioned patent claims, is to solve the above-mentioned problem. A condensing lens enters the liquid crystal panel as a parallel beam of light, and the image information formed on the liquid crystal panel is surely loaded onto the liquid crystal panel and the beam is emitted as a parallel beam.The condenser lens in front of the condensing lens concentrates the beam onto the projection lens, resulting in bright and precise light. A highly magnified image can be projected onto the screen, and at that time, the light that enters the liquid crystal panel from the front enters the front condensing lens through a total reflection mirror attached to the rear of the liquid crystal panel. In this way, the number of condensing lenses can be reduced and the device structure can be made more compact.Furthermore, a polarizing beam splitter is installed in front of the condensing lens to reduce the number of P waves and S waves. We can collect independent image information to form a clear enlarged image on the screen, and we can also add a dichroic prism to convert the high-precision image into a clear color image consisting of red, green, and blue. We have taken technical measures to enable clear images to be formed on the screen, and to effectively provide a sufficient cooling device in the space on the back side of the liquid crystal panel where the condensing lens is omitted. It is something.

<Embodiments - Configuration> Next, embodiments of the invention of this application will be described as follows based on the drawings of FIGS. 1 to 5. Note that the same parts as in FIG. 6.7 will be explained using the same reference numerals.

The embodiment shown in FIG. 1 is an embodiment of a basic mode, and a liquid crystal panel 1 connected to an electronic drive device (not shown) similar to a conventional mode is configured to form a predetermined color image, and the front side thereof is A set of a light source 2 such as a halogen lamp, a reflecting mirror 3, and a condenser lens 4 is installed at a predetermined location, and a condensing lens 5', which is a semi-convex lens, is attached to the front side of the liquid crystal panel 1. In addition, an appropriate total reflection mirror 8 is attached to the rear surface without a condensing lens, and a liquid cooling type cooling device 9 is attached with plenty of space in the effective space of the total reflection mirror 8 without a condensing lens. A screen 7 is provided, and a predetermined projection lens 6 is interposed between the screen 7 and the condenser lens 5'.

<Embodiment - Effect> In the above-described configuration, light from the light source 2 is reflected by the reflecting mirror 3, condensed by the condenser lens 4 onto the liquid crystal panel 1, and then directed to the liquid crystal panel 1 by the condensing lens 5' as parallel rays. The incident light is totally reflected by the total reflection mirror 8 on the rear surface and returns to the condensing lens 5 as a parallel light beam.
', the light is condensed and narrowed down to the projection lens 6, and midway through the process, the image information is picked up twice as it passes through the liquid crystal panel 1 to form a highly clear image, and the projection lens 6 transmits it to the screen 7. Projects a clear enlarged image with good contrast and no distortion.

The next basic embodiment shown in FIG. 2 is an embodiment in which a lightweight resin Fresnel lens 51 is added in place of the above-mentioned condensing lens 5', which reduces the weight and makes it compact. This is a liquid crystal image projecting device that has been further developed and is easy to handle, and its effects are substantially the same as those of the above-mentioned embodiments.

The embodiment shown in FIG. 3 is an embodiment in which the light separation property is improved, and a prism 9 is attached in front of the Fresnel lens 5' of the condensing lens of the liquid crystal panel 1, and a halogen film is attached in front of the prism 9. In this embodiment, the light source 2 of the lamp is attached to a set of a reflecting mirror 3 and a condenser lens 4, and an enlarged image is projected from the projection lens 6 onto the screen 7, and the light separation provides a clear and high contrast image. This allows images to be projected.

Further, the embodiment shown in FIG. 4 is also an applied embodiment, and for convenience of illustration, a light source, a reflecting mirror, and
Although the condenser lens is omitted, a pair of liquid crystal panels 1.
A polarizing beam splitter 11 is attached to the front of these panels to transmit P waves and reflect S waves.
In this embodiment, the P wave and the S wave are each independent images. In order to be able to obtain 1q of information, the screen 7 displays an image of P waves and an image of S waves.
The images created by the waves are combined and projected, thus projecting the images for left vision and six vision respectively, and the viewer can use polarized glasses for left vision and right vision to see clear and contrasty images. This is a mode in which a stereoscopic image without distortion can be visually recognized.

Next, the embodiment shown in FIG. 5 is an embodiment of another application mode, in which the liquid crystal panels 1' and 11.1" for red (R), green (G), and blue (B) are A dichroic prism 12 is set in front of condensing lenses 5'', 5'', and 5I of Fresnel lenses attached to each of these liquid crystal panels, with the phase changed by 90', and the dichroic prism 12 is set on the side where the liquid crystal panel is not provided A projection lens 6 is provided in front of the screen to display clear and distortion-free R, G, B (
The embodiment shown in FIG. 6 is a composite embodiment of the embodiment shown in FIG. 4.5. can be,
Dichroic prisms 12 and 12 are provided on both sides of the polarizing beam splitter 11, and each dichroic prism 12 has R (red), G (green), and B (blue) liquid crystal panels 1', 1', and 1M, respectively. Condensing lens Fresnel lens 5
This is a mode in which the clear left-view color image without distortion and the left-view color image can be enlarged and projected from the projection lens 6 onto the screen. In each of the embodiments shown in FIG. 3 and below, a predetermined simple cooling device 9 is provided in an effective space behind the total reflection mirror on the back of the liquid crystal panel 1, so that double transmission is achieved. It is possible to reliably prevent the temperature rise of the liquid crystal panel 1 through which light passes, and to maintain the image forming function.

Therefore, in each of the above-mentioned embodiments, parallel light is transmitted through each liquid crystal panel, picks up clear image information with no distortion and good contrast, and is focused on the projection lens to project an enlarged image onto the screen. There is.

Further, since a condensing lens such as a Fresnel lens is provided only in front of each liquid crystal panel 1, the mechanism is simple and lightweight, and the optical path can be halved.

<Effects of the Invention> As described above, according to the invention of this application, a color image or a monochrome image formed on a liquid crystal panel is basically enlarged and projected onto a screen by a projection lens using the light transmittance of the liquid crystal panel. In the mechanism, each liquid crystal panel has a total reflection mirror attached to its rear, so that the passing light picks up image information twice, and since the transmitted light is parallel rays, there is no distortion. Excellent effects are achieved in that a clear image can be projected onto the screen, and image information can be transmitted reliably.

In addition, since only one condensing lens needs to be attached to the front of the liquid crystal panel, it has the advantage of being economical, which not only simplifies assembly and manufacturing, but also reduces maintenance, inspection, etc. It has the excellent effect of being easy to use.

Furthermore, since the optical path is halved, the device mechanism can be made more compact and the operability can be improved, which is an excellent effect.

In addition, since a flat total reflection mirror is installed in one variable part of the liquid crystal panel, there is no need to install a condenser lens, etc., so the space can be used effectively and a cooling device can be attached to prevent the temperature of the liquid crystal from rising. This has the effect of maintaining performance.

In addition, by installing a polarizing beam splitter, dichroic prism, or even a prism in front of the liquid crystal panel, it is possible to use the separation and composition properties of light, and to achieve optical characteristics extremely economically. This has the excellent effect of making it possible to maintain the device mechanism that utilizes it.

[Brief explanation of the drawing]

1-6 are detailed explanatory diagrams of the invention of this application, FIGS. 1.2 are sectional side views of the basic embodiment, FIGS. 3-5 are partial sectional side views of the applied embodiments, Figure 7.8 is a partially sectional side view of a conventional liquid crystal image projection mechanism. 2... Light source, 7... Screen, 6... Projection lens, 1... Liquid crystal panel for image formation, 8...
total reflection mirror, 11...polarizing beam splitter,

Claims (4)

[Claims] (1) In a liquid crystal image projection mechanism in which an image forming liquid crystal panel is interposed between a light source and a projection lens for a screen, a condensing lens is attached to the front side of the liquid crystal panel and a total reflection mirror is attached to the back side. A liquid crystal image projection mechanism characterized by: (2) The liquid crystal image projection mechanism according to claim 1, wherein a polarizing beam splitter is provided in front of the condenser lens. (3) Claim 1, characterized in that a dichroic prism is attached in front of the condensing lens.
The liquid crystal image projection mechanism described in Section 2. (4) The liquid crystal image projection mechanism according to claim 1, further comprising a cooling device attached to the rear side of the liquid crystal panel.