JPS5991784A - Color picture display device - Google Patents

Abstract

PURPOSE:To display a color picture without flicker substantially by changing a timing of a video signal and its corresponding deflection at each chrominance component picture to shift the timing of picture display. CONSTITUTION:An R-Y signal in an output of a video signal processing circuit 21 is amplified to a prescribed level and applied to a cathode of a high luminance CRT41 for R signal. Since a normal deflecting current is applied to a vertical deflection coil 44 of the CRT41, an output of a signal source 10 is displayed normally. Further, a G-Y signal is applied to a cathode of a high luminance CRT42 for G signal in the timing delayed by 87H via a delay circuit 23. Since a deflection current delayed by 87H is applied to a vertical deflection coil 46 of the CRT42, the picture of the G signal component is displayed in the timing delayed by 87H from the normal timing. A B-Y signal is processed similarly. Thus, the picture of the R, G, B is displayed sequentially at the interval of about 1/3 field, then the picture is recognized as a color picture without any flicker visually.

Description

[Detailed description of the invention] (a) Industrial application field: Multi-tube video projector, color plasma display device,
A color image projection device, such as a color liquid crystal display device or a color liquid crystal display device, which can vary the scanning timing for image reproduction for each primary color or partial color.

((2) Conventional technology A color video signal 8 (digital information) that has been A-D converted and written frame by frame in a digital frame recorder 9 is read out at high speed in a field period, and a frame image is projected for each field. A color image projection device or a color image projection device that creates a video signal that interpolates from adjacent fields, and interpolates interpolation information between normal field information at a scanning speed of 1 and 2 times.

Are the horizontal and vertical scanning speeds changed in any of the conventional examples? In addition to complicating the deflection circuit and device, it is inevitable to double the speed at which digitized video information is output from the frame memory, so a digital circuit with a high processing speed must be used. This will force the video signal system to have even higher bandwidths. That is, in this type of digital circuit, the video signal is converted into a digital signal and processed by an analog-to-digital converter.
The sampling frequency for this digitization is generally selected to be 6 times or 4 times the color subcapacitor 97 frequency (hereinafter abbreviated as fsc). Then, if you perform double-speed reading as described above,
The logic circuit after reading has an fsc of 6 times or 8 times, respectively, which is significant and requires a high-speed logic circuit. Further, the signal circuit converted to analog requires a frequency band twice as large as the normal video signal band (approximately 4 MHz), and the technical IC is difficult and the cost is inevitably high.

(/→ Object of the present invention) In a color image projection device such as a multi-tube video projector that can vary the scanning timing for color image reproduction for each primary color, a color image can be produced at a low cost and with virtually no flicker. To provide a device 2 capable of projecting images.

B) A memory for storing a color television signal in units of constituent fields or frames according to the present invention, and a signal read out from this memory, for example, for each primary color by changing the timing of the field or frame period. and a means for scanning and forming an image in synchronization with the timing of the successive signal calls read out for each primary color, and configured such that the image forming means reproduces the composite image as a color image on the same screen. Color image projection device.

(e) Examples of the present invention Is this invention? Main parts of the 6-tube video projector (
(b) An embodiment of the present invention will be described with reference to FIG. 1 showing a circuit block diagram 3 and FIG. 2 showing a circuit block diagram #I5I.

In FIG. 1, the figure number (ship) indicates a baseband level color television signal source, and in the case of the embodiment, a television tuner equipped with a video detection circuit συ connected to a video intermediate frequency amplification circuit. However, a reproducing means such as a VTR or a video disc may also be used.

The main block diagram of FIG. 1 basically consists of high-brightness cathode ray tube lines (40) corresponding to colors.

The video signal system (2) is the video signal processing circuit (21)
and video signal delay circuits.

The video signal processing circuit (20) has a video detection output 2
Human power is used, and R-Y%G-Y and B-Y (or R
%G,B) Has a black box function that outputs signals.
Since this corresponds to a circuit including a brightness control circuit, a color signal multi-axis circuit, and a matrix circuit of a normal television receiver, I will omit the comment 3iJ.

The video signal delay circuit L2 is inserted into the C and -Y signal channels and outputs the G-Y signal. The first delay circuit (23I) delays the non-delayed RY signal by approximately -field equivalent time (87H, where H is the horizontal scanning period).

Is the B-Y signal inserted into the B-Y signal channel? RH)f
? It has a second delay circuit [241] which delays by .

Each of the delay paths is a magnetic disk type analog delay device, that is, a magnetic disk or magnetic drum or so-called magnetic disk with the time interval of the write and read heads set to one field to one field, respectively. C.O.
A digital delay circuit using D, etc. or a digital delay N circuit that sets the timing of writing and reading of the Lunomo 9 to the time equivalent to the τ or tt7 field? Yes. The latter will be explained later with reference to FIG. 2 of the VC.

The above-mentioned high-brightness cathode ray tube line (4Q) adopts a configuration in which high-brightness cathode ray tubes corresponding to the JFt colors (R, G, and B) are arranged in a delta or in-line arrangement, and are arranged in a delta or inline arrangement. 4υ(42) and (431 are
It is equipped with horizontal and vertical deflection coil pairs (44) (451, 146) (47) and I481+49) that can perform beam scanning with unique timing.

The deflection system t3f)l is a synchronization separation circuit (31) inputting the output of the video detection circuit circle, each of the R, G, and B high-intensity Sirawan tubes, (41), (42), and (43) horizontal Deflection coil (a (47) 14!31 VCC12
The horizontal deflection circuit 13 supplies a common deflection current synchronized with the horizontal synchronizing pulse being output from the synchronization separation circuit C31), and the vertical deflection coils (441t46) of each of the high-intensity cathode ray tubes (4υ and (43) The first, second and sixth vertical deflection circuits supplying deflection currents to +481F and the second vertical deflection circuit respectively at their own timings, and the second vertical deflection circuit diagram, the synchronous separation circuit (3) The output vertical synchronizing pulse of J is delayed from the normal timing by a delay time equivalent to the delay amount (87H) of the first video signal delay circuit (23) and is supplied by the first pulse delay circuit (similar to (2)). The normal timing of the vertical synchronization pulse is determined by the delay amount (1!, 5H) of the second bit g signal delay circuit (241).
) A second pulse delay spoon (9) or (37) is provided for supplying the pulse after delaying the pulse by a considerable delay time. These pulse delays t! l
l! A monostable multivibrator in which the above-mentioned delay time is a metastable time can be used as the J.

In such a configuration, among the outputs of the video signal processing circuit t21J, the R-Y signal is amplified to a predetermined level and then sent to the cathode of the high-intensity cathode ray tube (4) for the R signal without performing equivalent delay processing. Since the vertical deflection coil +441VC of this cathode ray tube (4) is supplied with a normal (non-delayed J deflection current), the output of the color television signal source 11a is normally displayed as far as the red signal is concerned. On the other hand, the G-Y signal is supplied to the cathode of the G signal high-intensity cathode ray tube (42) via the first video signal delay circuit (c) 2 at a timing delayed by a time equivalent to 87H. Since the vertical deflection coil (46) of the cathode ray tube (421) is supplied with a deflection current that is delayed by 87H compared to the output vertical synchronization pulse of the synchronization separation circuit 1311, the image of the G signal J8-component is not normal. The %B-Y signal is displayed at a timing delayed by 87H.The %B-Y signal passes through the second video signal delay circuit (2),
The signal is supplied to the cathode of the high-intensity cathode ray tube f43) for the B signal at a timing delayed by a time corresponding to 35H.

This cathode ray tube (431 vertical deflection coil (481 has a sync separation circuit) (compared to the 3D output vertical sync pulse
Since the deflection current delayed by 5H is supplied, B
The image of the signal component is displayed at a timing 165H apart from normal. Therefore, on the screen of a video projector: - Images of the R component, G component, and B component of the same color image are sequentially projected at one field interval, so that they are visually recognized as a sharp color image.

Next, the embodiment shown in FIG. 2 will be explained. In the embodiment of FIG. 2, the bidet has a signal delay l! ? 1. Field memory is used as 2.

The video delay circuit 1221 includes Fl-Y, C, -Y,
An A-D converter circuit 6 which converts each of the video signals B to Y into digital signals and the converted signals? A field memo 9f521 that stores each field in units of one field, a successive timing pulse generation circuit 53 that generates a pulse for reading out the stored contents of the field memo y at a preset timing, that is, every other field, and the field memory. 1st to 3rd D-A conversion l for converting each digital signal read out at different timings into analog;
! ll! It consists of circuit 6 (55166). With this kind of configuration, R, G, B of the color image of each field
(R-Y%G'Y%B-Y) Each acid component - the corresponding video output circuit 571 at the timing of each field
(Added to 581 or (59).

4Jfl for the first and second pulse delay circuits +23: If the monostable multivibrator is used, the time constants can be set to 6, which corresponds to the time equivalent to 1 field and -field, respectively, but the horizontal pulse counter In the case of configuring with
Note 1k'C' Successive timing pulse generation circuit (53) that generates a pulse that determines the timing of successive hidden signals.
) can be used to preset the 87H and 135HVC kakuntas, respectively, and to set y using the vertical synchronization signal. # Among the other constituent elements, the same constituent elements as those in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted.

In the above explanation, is it timing? Although the color components of the image to be shifted and displayed are R, G, and B5, they may be divided into the G component, which is visually highly recognizable, and two other phases, such as maze fern. One field is appropriate as a delay for seven. In the above explanation, a multi-color video projector was used as an example, but the regeneration of each color component image can be done using a color display device that can change the projection timing, such as a color plasma display device or an LED. Matrix panel? Needless to say, the present invention can also be applied to color display devices or color liquid crystal display devices.

(F) Effect According to the present invention, it is possible to substantially eliminate flicker by simply changing the video signal and the corresponding deflection (or scanning) timing for each color component image and shifting the image projection timing by 2. Therefore, it is possible to realize a flicker-free color image projection device at low cost without requiring higher speed of memory or other digital circuits or wider bandwidth of analog circuits.

[Brief explanation of the drawing]

The drawings all relate to the apparatus of the present invention, and FIG. 1 is a block diagram of the main circuit of one embodiment, and FIG. 2 is a block diagram of the main circuit of another embodiment. (1)...Video signal processing circuit, C+1241...
1st and 2nd video signal delay circuit, f31)... Synchronization separation circuit, (361C371... 1st, 2nd pulse delay circuit W! 1 parrot Gω... 1st, 2nd, 6 Vertical deflection circuit, B2...Horizontal deflection circuit.

Claims (1)

[Claims] flJ Record a color television signal in units of fields or frames '1, from a memory containing -? For each of the five primary colors or partial colors, signals are successively transmitted at different timings in the field or frame period, and each reading partner +j
1. A color image projecting device configured to synthesize and reproduce a color image on the same surface by separate means for scanning and forming an image in synchronization with the reading timing. (2) The vertical scanning timing for each primary color or each partial color is shifted by an integer multiple of the horizontal scanning period, and the horizontal scanning timing is made common.Color image according to claim 1 Projection device. (3J) The color image projection device according to claim @11, characterized in that the primary colors are red, green, and blue. (4) The color image projection device is characterized in that the partial colors are green and magenta. A color image projection device according to claim 1. (5) The means for scanning and forming an image in synchronization with the successive timing is configured as a part of a multi-tube video projector. Claim 1 characterized by different features
The color image projection device described in Section 1.