SU1215194A1 - Final device for projection-type colour television receiver - Google Patents

Abstract

The invention provides a simplification of the device by reducing. the number of light sources. Beam source 1 light. The BOI U radiation is defocused by a de-oping optical system 2 and falls on a block of 3 electro-optical modulators (EOM) of the main colors of the reproduced image. Amplitude modulated light beams with an EOM of 4-6 through the staining light filters 7-9 are fed to a focusing optical system 10, which forms one light flux. Using a vertical and horizontal scanning unit 11, the light beam forms a TV raster, which is projected onto the screen 13 by means of the optical system 12. 2 ill. main colors. This unit contains three EOM 4-6 and three light filters 7-9 (blue, green, and red scales), made, for example, in the form of a phosphor film. The EOM is supplied with the control colors of the reproduced image colors. Amplitude modulated light beams with an EOM 4-6 through the staining filters 7-9 are fed to a focusing optical system 10, which forms one light flux. Using the vertical and horizontal scanning unit 11, the light beam forms a TV raster, which is projected onto the screen 13 by means of the optical system 12. 2 ill. i (L s /

Description

one

The invention relates to color television, more precisely to color television TV) receivers of the projection type, as well as to the end devices of color video terminals and information boards of the EU computer

The aim of the invention is to simplify the device.

Figure 1 shows a structural electrical circuit of a color TV terminal device of a projection type receiver; Fig. 2 shows the variants of mutual arrangement of the EOM for the case of implementing the color monoscopic version of the terminal device (a) and the case of implementing color stereoscopy of the celled version of the terminal device C "S).

The color TV receiver terminal of the projection-type ika (Fig. 1) contains a light source 1, a defocusing optical system 2, a unit 3 of electro-optical modulators SEOM) primary colors, consisting of an EOM 4-. 6 and light filters 7 to 9 of the main colors, focusing the optical system 10, block II of vertical and horizontal scanning, optical system 12 and screen 13.

The device works as follows.

Source 1 continuously generates a light beam, which is defocused by the Defocusing optical system 2, after which it hits the working surfaces of the EOM 4, 5 and 6 of the block 3. Each of the received three light beams is modulated at an intensity by one of the EOM 4-6, which receive control signals proportional to the signals of blue, green and red primary colors of the reproduced image (not shown. Modulated in amplitude by signals of primary colors, light beams of the same spectral composition with output EO 4,5 and 6 come to the blue, green and red primary colors installed on their external working surfaces, each of the three light beams modulated in intensity is colored in the corresponding primary color — blue, green or red, after which all three light beams promo15194

The radiation intensity and wavelength dulled are assembled into one light beam by a focusing optical system 10.

5 Next, using a block I1, a TV raster is formed, which is projected using the optical system 12 as a color TV image onto the screen 13.

 О The introduction of an additional fourth electro-optic modulator and a light filter into unit 3 of the EOM allows to obtain a stereoscopic version of a color TV terminal device.

 5 receivers.

In this case, the control inputs of the EOM 4-6 are given signals proportional to the signal of the right half-frame of the stereo pair, and to the control input

On the 20th of the fourth EOM, a control signal is supplied that is proportional to the luminous signal of the left half-frame of the stereo pair. It should be noted that, when implemented, source 1 can be used as a source of coherent radiation with a monochromatic radiation spectrum, such as a laser, or any source of achromatic radiation of sufficient power with a continuous radiation spectrum. However, light filters 7-9 are required both when using sources of coherent monochromatic radiation (for example, lasers, quantoscopes, high-frequency electrodeless lamps, etc.J) and when using sources of achromatic radiation spectrum (for example, xenon lamps 40). light filters 7 to 9 are significantly different when using monochromatic and achromatic light sources. So, using 45 achromatic light sources, such as xenon lamps, could t be used as passive filters carriers colors, for example of colored glass,

5Q are also active, for example, of quartz glass, coated on the outside. Layers of photoluminescent phosphors, for example, water-polymer fluorescent paints of primary colors of radiation.

55

In the case of using monochromatic light sources, it is necessary to use active light filter:

3

These filters provide a change in the wavelength of the radiation from the source 1. In this case, the presence of all three light filters 7–9 is only necessary when implementing the stereoscopic version of the target device. When implementing a monoscopic version of the terminal device, it is necessary and sufficient to use two active light filters 8 and 9, respectively, of red and green colors and source I with a blue emission wavelength.

The design feature of the invention is the possibility of combining electro-optical modulators 4-6 and light filters 7-9 on a single chip in the form of a single unit 3 EOM. In particular, in the practical implementation, all EOM 4-6 can be performed using a single technology on a single garnet film of a 5d5d501g structure on a light plane with applying photolumi- num-shaped light filters 7–9 directly to external control electrodes with 4-6 ePT that will provide 10% modulation of each of the four light fluxes in the frequency range from 0 to 300 MHz with control fields x 6E.

In turn, the execution of all 1 electro-optical modulators of the light flux on one garnet film greatly simplifies the white balance adjustment both during the initial setup and during operation, since white balance control in the range from 0 to 100% is provided by: adjusting the diameter of the light beam falling on the working surface15194

EOM 4-6, changing the distance to the defocusing optical system 2, as well as adjusting the relative position of the geometric centers of the working surface of the EOM 4-6 and defocusing optical system 2 horizontally and vertically.

Claims (1)

10 claims A projection-type color television receiver, containing a source of light radiation and a unit of electro-optical modulators of primary colors, as well as a vertical and horizontal scanning unit, an optical system and a screen sequentially arranged on one optical axis, in order to simplify the device of reducing the number of light sources, between the light source and the vertical and horizontal scanning unit, after Optically located on 1 / one optical axis are defocusing and focusing optical systems, between which a block of electro-optical modulators of primary colors is placed, which is made in the form of cylinder segments placed on the main axis of symmetry on the optical axis, and between each segment of the block of electro-optical modulators and the input optical filters of the corresponding primary colors, made, for example, in the form of a photoluminescent film, are located by the focusing optical system. VNIIPI Order 912/60 Circulation 624 Subscription Branch PPP Patent, city 1, Proektna str., 4 FIG. 2