JPH01200795A - Color picture projection device - Google Patents

Abstract

PURPOSE:To prevent a color slurring without making necessary a synthesizing adjustment by successively outputting primary-colored or black colored color- separated pictures to a picture output device, synchronizing a primary colors filter with respective color pictures in a projection optical path, successively inserting and synthesizing the color picture on a projection surface. CONSTITUTION:A lamp 8 is turned on by pressing a switch 5b and its light is transmitted through a liquid crystal displaying device 6. The displayed picture of the device 6 passes through a filter holding plate 11 and a projection lens 10, is reflected by a reflection mirror 16 and projected on a screen 16. Pictures separated into R, G and B primary colors or black color are successively displayed on the device 6, the filter holding plate 11 is rotated in accordance with this order and the R, G and B filters are successively inserted into the optical path. The respective pictures are colored by the filters R, G and B corresponding to the colors of the pictures, projected on the screen 16 by the projection lens 10 and the color picture can be synthesized on the screen 16 by using the afterimage effect of eyes.

Description

[Detailed description of the invention] Emperor - Upper 'η') field 4. This invention relates to a color image projection device.

As shown in Figure 4, the conventional color image projection device
The filter 71, the G filter 72, and the B filter 73 are provided with image display devices 74, 75, 76, such as liquid crystal display boards, respectively.
Capacitors 77, 78, 79 and lamps 70, 80.9
0 is placed. Then, each color is projected onto the screen 85 in a composite manner using a color composition prism 93 and a composition lens 94.

Problems to be Solved by Bright Color LCD panels currently exist in color, but they have low contrast in transmittance and reflectance, and low resolution. For this reason, when using a liquid crystal display board, in color projection equipment, a lamp, a liquid crystal display board, and a filter are provided for each of the separated R, G, and B colors, and these are combined using a prism, half mirror, etc., and a lens is used. It is necessary to project a color image through.

Therefore, a 311 lamp (including a cooling device) or a high-output lamp must be separated into three optical paths, a liquid crystal display panel, and a composite optical system, which greatly increases the cost. In addition, it is very difficult to adjust the composition of images for each color, and color shifts are likely to occur due to differences in magnification, aberrations, etc., and a long adjustment time is required, and components also require high precision. Also, the entire device is very crowded.

``Nijomaru'' The object of the present invention is to provide a color image projection device that can be made compact, does not require synthesis adjustment, and does not cause color misregistration.

1” Marushihi The invention is summarized in the claims.

No way to solve the two problems Please refer to FIG.

The color image projection device 1 enlarges and projects an image of a liquid crystal display device I'f 6 onto a screen 16, which is a projection surface, through a projection lens 10.

A color image projection device 1 according to the present invention sequentially outputs color-separated images corresponding to the three primary colors of red, green, and blue and black.
, Zoshi-' (This color image projection device 1 arranges filters R, G, and B of each color of red, green, and blue corresponding to these images in the projection optical path. Filters R, G, and B are sequentially inserted into the optical path in synchronization with the appearance of the images, and images of each color are sequentially projected onto the screen 16 to synthesize a color image.

For this reason, it is possible to obtain a color image with no color shift even though it has a compact configuration.

1 round bill top Please refer to FIGS. 1 and 2.

An overhead projector type color image projection device 1 includes a main body 2, a support 3, and a head portion 4. A pillar 3 is provided vertically at the corner of the main body 2. A head portion 4 is set on this support 3 so as to be adjustable in vertical movement.

[Main body 2] The main body 2 is provided with buttons such as a reset button 5 and a liquid crystal display device 6.

Further, inside the main body 2, a light source 8 and a Fresnel lens 9 for M-column light are provided.

This light source 8 emits visible light, and preferably has a small amount of infrared light component. If necessary, a filter can also be installed at the center to remove infrared light.

[Head section 4] The head section 4 includes a projection lens 10, a filter holding plate 11,
Drive system 12, Fu A]-interrupter 13, base plate 14
and a reflecting mirror 15.

The reflecting mirror 15 can reflect the image of the liquid crystal display device 6 through the projection lens 10 and project it onto the screen 16. The reflecting mirror 15 is tilted at a predetermined angle with respect to the base plate 1/1. configurable.

The filter holding plate 11 is a disc-shaped rotating body and has three primary color filters R, G, and B arranged in equal divisions. The filter holding plate 11 has a gear 11a formed around it 1,
This gear 11a meshes with the gear V20 of the drive means 12. The gear A 20 is taken up by the output J axis 22 of the output 21.

By lighting the lamp 8, the image on the liquid crystal display device 6 is displayed through an opening in the base plate 14 (not shown), filters R, G, and BJ3 of any of the filter holding plates 11, and the projection lens 10. Screen 1 due to foul Mira~15
Projected onto G.

The control device shown in FIG. 2 matches the timing of image display on the liquid crystal display device 6 with the rotation timing of the filters R, G, and B.

The control device includes:) first to interrupter 13, differentiation circuit 30;
, microphone [1b[] setting unit 1-31 (hereinafter M
PU), a motor drive circuit 32 of the motor 21, and an interface 33 are shown on the right.

See Figure 2. No A1-interrupter 13 is one that is normally used. Light from the light emitting diode 25 is always received by the diode 26. Filter holding plate 1
A shield body 27 (two representatively shown in FIG. 2) is attached around the shield 1.
(When the router holding plate 11 rotates and U, L, and the shield 27 block the light from the light emitting diode 25, the light receiving diode 26 changes from on to instant A).

The interface 3 receives the video signal from the control unit (not shown).
3, a signal is given to the MPU 31 and the liquid crystal display device 6. 1, the MPU 31 gives a drive signal to the motor drive circuit 32 to rotate the motor 21. As a result, the filter holding plate 11 rotates, and the shield body 27 connects to the light emitting diode 2.
When the light of 5 is blocked, the light receiving diode 26 is turned from on to off. On the other hand, the liquid crystal display device 6 displays images corresponding to R, G, and B.

When the light receiving diode turns off, a negative pulse is generated in the differentiating circuit 30, turning on the transistor 36 and MPU 31
It then gives a signal to 15. When the MPU 31 counts this output signal, the rotation speed of the refilter holding plate 11 and the video signal applied to the liquid crystal display device 6 are synchronized. However, by dividing the period of the silence signal into three equal parts, it becomes clear when to insert the R, G, and B filters, and in synchronization with this, the R, G, and B filters are displayed on the LCD
The image corresponding to the image will be displayed. If the display period of each image is made sufficiently short, flickering will no longer be felt. Further, the rotation reference position of the filter holding plate 11 can be determined by the obstruction signal. .

Returning to FIG. 1, in use, the lamp 8 is turned on by pressing the switch 51), and the light is transmitted to the liquid crystal display device 6. As a result, the displayed image on the liquid crystal display device 6 passes through the filter holding plate 11 and the projection lens 10, and then passes through the reflection mirror 1.
5 and is projected onto the screen 16.

An image (black: monochrome image) separated into the three primary colors of R, G, and B or other colors as necessary is displayed on the liquid crystal display device 6, and the optical path is sequentially changed by rotating the -C filter holding plate 11 according to this order. Insert filters R, G, and B inside.

Light irradiated by the lamp 8 passes through the liquid crystal display device 6, and each image is colored by a filter R, G, or B corresponding to the image, and is projected onto the screen 16 through the projection lens 10.

By repeating this, 8 R, G, and 8 images are sequentially created on the screen 16, and by using the afterimage effect of the eyes, it is possible to display it as a color screen on the screen 16.

Circle 19 λ Refer to Figure 3. The color image projector shown in FIG. 3 has a filter holding plate 111 inside the main body 102 and a projection lens
An example is shown in which the aperture is set within 10 apertures.

Inside the main body 102, an anti-I mirror 101, a lamp 108, a Fresnel lens 109, a liquid crystal display device 106, a filter holding plate 111, a driving means 112, a projection lens 110, and a photo interrupter 113 are provided.

In this way, if the filter holding plate 111 is placed in the narrow part of the optical path of the projection optical system, such as within the aperture -10=, the area of the filters R, G, and B (only B is not shown in the drawing) can be reduced. However, you can only color it. Moreover, since it is small, high-speed rotation control is also possible.

These components are substantially the same as those in Example 1. However, the filter holding plate 111 has a gill 111b attached to the central axis 111a. mouth gear A7
1111) is meshed with the gear 120 of the motor 121. However, the present invention is not limited to the above embodiment. For example, although the lamp light is transmitted to the liquid crystal display device, it is also possible to reflect the lamp light to the liquid crystal display device and guide the image to the projection lens. Further, in addition to the liquid crystal display device, for example, a 08 display device or a plasma display device may be used.

Can be applied not only to enlarged projection but also to reduced projection equipment 3
From the above explanation, compared to conventional formats, image display devices such as liquid crystal display devices, illumination systems (lamps, condenser lenses), image synthesis optical systems (prisms, half mirrors, etc.) ) etc. can be reduced or eliminated. 'In other words, it is very simple, costs can be kept low, and the device can be made more compact.

Furthermore, since there is no need to combine multiple images, optical adjustment is simplified, and image quality is improved by eliminating misalignment of each color image, color blurring due to differences in magnification, etc.

Roughly speaking, one image display device such as a liquid crystal display device is J
As a result, there are fewer restrictions on size, and the number of pixels can be easily increased, resulting in a dense (high resolution) projection screen.

-12=Furthermore, since the image display device can be made larger, the amount of light irradiated per unit area of the liquid crystal surface can be reduced, making it possible to extend the life of the liquid crystal, which is sensitive to heat. Furthermore, if sufficient cooling is performed, the projection light weight can be increased and a bright projected image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of a color image projection device of the present invention, FIG. 2 is a diagram showing an example of a control device thereof, and FIG.
This figure is a schematic view showing a second embodiment of the color image projection apparatus of the present invention, and FIG. 4 is a first view showing a conventional example. 1... Color image projection device 2... Main body 4... Head section 6... Liquid crystal display device] 1... Filter holding plates R, G, B... Filter Fig. 1

Claims (1)

[Claims] In a color image projection device that projects an image outputted to the image output device onto a projection surface through a lens, the image output device includes a color separation device corresponding to the three primary colors of red, green, and blue or black. The red, green, and blue color filters corresponding to each image are placed in the projection optical path, and the filters of each color are sequentially output in the optical path in synchronization with the appearance of the images corresponding to each color. A color image projection device is configured to insert a color image and sequentially project images of each color onto a projection surface to synthesize a color image.