JPH09135400A - Image column display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To observe images without lowering the resolution by providing optical filtering device-s, which are controlled for the observation of display device due to various observers, and controlling these filtering devices so that the filtering devices can be optically transmissible only during the image display of image sequence. SOLUTION: Observers 10 and 11 observe an image screen 8 through respective optical filtering means 12 and 13. The filtering means are controlled from control equipment 5 so that the filtering means 12 can be made transmissive when displaying the half image of 1st channel and the filtering means 13 can be made transmissive when displaying the half image of 2nd channel. The optical filters 12 and 13 are not transmissive to light during the display time interval of the other filter. Namely, the filters 12 and 13 are complementarily controlled. Therefore, only the half image of reception channel is made visible through the optical filtering means corresponding to one observer for that observer. The observer can sense the image just in the case of ordinary display without any reresolution loss.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a device for displaying at least two image sequences by means of a display device.

[0002]

2. Description of the Prior Art 2 on the image screen of a television device.
To display two image rows, devices for so-called image-in-image insertion have hitherto been used, for example as described in EP-A-0471871.
The row of images to be inserted is then inserted in the row part provided for the insertion of the image row of the main image. The image to be inserted has to be reduced and possibly transformed onto the raster position of the main image. Thereby the resolution is reduced. Further, the image information of the main image is hidden by the image to be inserted.

Furthermore, it is known to reduce two images respectively and display them side by side in format 4: 3 on an image screen for format 16: 9, again the image information being different parts of the same image row. Is displayed in. The resolution for both images is reduced by the image reduction and also by the raster position conversion, which may possibly be performed in relation to the phase position from the first image to the second image.

DE-A 3212021 describes a device by which the images of a first and a second image sequence can be displayed alternately on a display device. First and second
The image sequence of contains image information obtained from a common image plane from various viewing angles. The image train is made visible to the observer by means of a respective one optical filter means, in which one of the filter means is transparently switched only during the half-image of the image train associated with it. Each one filter means is provided for one of the eyes of a single observer.
This device produces a three-dimensional image impression.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a device for displaying at least two image sequences, which allows the image to be viewed in full size and without loss of resolution. To do.

[0006]

In order to solve this problem, according to the invention, a processing device for preparing an image sequence and the images of the first and second image sequences are displayed alternately for each image. Display device, each of which includes at least first and second optical filter devices controlled by the processing device for viewing the display device by a different observer, each of which includes an image train. Is optically transparent only during the display of the image. A preferred configuration is claim 2.
It is shown below.

With the device according to the invention, the conversion of the image into the reproduction raster position is no longer necessary. During processing of the half-images engaged in a row, it is expedient for them to be temporarily stored in each image memory associated with the image channel. If the read start for both image channels is chosen properly, only one half-image memory capacity is required for each channel.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 shows a television set for receiving from at least two transmitters which can be displayed on one image screen at the same time, and via suitable eyeglasses driven by the television set. Two observers are shown symbolically, observing the image screen.
The television device comprises a signal processing device 1 for a first reception channel, which signal processing device 1 is supplied with a first image signal and is then digitized in the base band, for example in the format YUV. Generates video signals and appropriate control signals. A corresponding device 2 is provided for the second image channel. At the output of the device 1 there is a half image which is engaged in a row for the first image channel. This means that the first half-images A1, A2, ... Include an odd number of rows and the second half images B1, B2, ... Include an even number of rows. At the output of the device 1 there is then a half-image sequence A1, B1, A2, B2, .... At the output of the processing device 2 are the columns C1, D1, C2, D
There are half-images engaged in a row for the second image channel with 2, ... The half images are temporarily stored in each one memory device 3, 4. The memory device generally serves to buffer the images received asynchronously so that they can subsequently be displayed synchronously in the required temporal order.
The controller 5 evaluates the temporal relative positions of the read half-images and their raster positions, ie to see if there are half-images with even rows or half-rows with odd rows. Image memory 3,
Arrange to read from 4 at the correct time.
For this purpose, the control unit 5 is supplied with horizontal and vertical synchronizing pulses via lines 6, 7. Half-image is memory 3, 4 to 2
It is read out at the doubled row frequency, digital-to-analog converted and provided to the image screen 8 for display.
Each complete half-image is read out from the memories 3, 4 alternately. From the control device 5 to the image screen 8 via the lead wire 9,
It is informed which raster the half-image just to be read belongs to, so that the deflection device of the image screen 8 provides an equal raster position.

The different half-images of the program are displayed alternately on the image screen. The image trains supplied to the devices 1, 2 contain image contents which are completely independent of one another. The image sequences are accepted independently of each other. For example, these are two different feature films of course with irrelevant content. An observer will not be able to see either of the image content of both channels with the naked eye. Therefore, two observers 1
0, 11 observe the image screen 8 via the respective one optical filter means 12, 13. The filter means is displayed from the control device 5 such that one of the filter means, eg 12 is transparent when the half-image of the very first channel is displayed, and also the half-image of the second channel exactly. Sometimes the other of the filter means, for example 13, is controlled to be transparent. During the respective other display time interval, the optical filters 12, 13 are not transparent to light. That is, the filters 12 and 13 are controlled complementarily to each other. Therefore, only one half image of the reception channel is visible to one observer via the optical filter means associated with the observer. The observer can perceive the image without resolution loss as in a normal display. It is expedient for the observer to be provided with the corresponding audio channels via headphones.

As the optical filter means 12 and 13,
So-called shutter eyeglasses are suitable which include an LCD screen which can be electronically controlled in the form of eyeglasses for each eye to be transparent or opaque to light. further,
Mechanical means are also conceivable, for each eye providing a mechanical lens which is opened or closed by the control device 5 in an image-indicating rhythm with respect to the image channel desired by the observer. In principle, however, any optical filter means which can be switched transmissive or opaque to light by a signal having a half-image reproduction frequency emitted by the control device 5 is suitable. The attenuation between transmissive and opaque states must then be optimized in relation to the display medium in order to minimize the crosstalk between the two channels.

The states and the time course of the signals in the device of FIG. 1 are illustrated by FIGS. 2 (a) to 2 (f). FIG.
In (a) and (b), the read image rows and the read image rows in the memories 3 and 4 are shown. For example, the ray 20 indicates the read pointer for the first read half-image A1 in the memory 3 for the first image channel. The reading ray 21 corresponds to reading of the half image B1 or the like. In a corresponding manner, the half-images C1, D1, C are shown in FIG. 2 (b).
2, the read pointer for D2 is shown. Furthermore, both figures contain the respective read pointers for the memories 3, 4. For example, the pointer 22 indicates the reading of the previously read half-image A1 marked A1 '. Since the reading is performed at the doubled row frequency, the pointer 2
2 has a double rising slope compared to the pointer 20. The reading of the half image C1 'starts when the reading of the half image A1' is completed. Vertical blanking gaps have been ignored for simplicity and clarity.

The start of the read-out for the half-image A1 ', ie the start of the ray 22, must be positioned so that no cross-over of the read-in and read-out processes takes place in any of the half-image memories 3,4. Thereby it is achieved that only the motion stage is displayed in the reproduced image and no disturbing image cutting occurs. The permissible range for the start of the reading process in the image memories 3, 4 is indicated by the time intervals 24 or 25 in FIG. The pointers 22a, 22b and 23a, 23b marked with dashed lines indicate the earliest possible read pointer and the slowest possible read pointer for a read in the memory 3 or 4, respectively. Readout is done at doubled line speed, so
The earliest possible start for reading in the half-image memories 3, 4 lies when half of the rows of the half-images to be read subsequently have already been written into the respective memories.

By means of the logic circuit means in the read control device 5, it is possible to easily determine which read times are necessary so that crossing of the read and read pointers in the memories 3, 4 is avoided. The half-image reading of the image channel then directly follows the end of the half-image reading of the other channel. Vertical blanking gaps should also be taken into account in practical configurations. The control device 5 therefore evaluates the address counters associated with the image memories 3, 4 for reading in the respective image memory controlled by the vertical sync pulse. By observing the above conditions, each of the image memories 3 and 4 is a single one.
It is sufficient to have the memory capacity for one half image.

The image screen 8 is shown in FIGS. 2 (a) and 2 (b).
The half-image train shown in FIG. 2C is supplied at the phase position shown in FIG. This row raster information is communicated to the image screen 8 via leads 9 so that the half images are displayed in their respective row rasters. FIG.
The half image A1 'is displayed in the row raster α for odd rows as shown in (d). The same applies to the half image C1 '. Half-image B1 'is displayed in raster β for even rows (and so on). 2 (e) and (f) drive signals S1, S2 for the filter means 12 or 13, for example shutter glasses, are shown. The shutter glasses are light transmissive when the respective control signal S1 or S2 has a logic H level. The shutter glasses 12 driven by the signal S1 are each light transmissive when an image belonging to the first channel, ie A1 ′, B1 ′, ... Is displayed on the image screen 8. The shutter glasses 13 have second image channels C1 ′, D1 ′, ...
Is switched to light transmissive when a half-image of is displayed.

A conventional cathode ray image screen tube can be used as the display means. In such an image screen tube, the luminescent material is excited by the electron beam to emit light,
The image point continues to shine due to the afterglow effect even after the electron beam advances. In the device according to the invention, the projection image screen offers the advantage that no afterglow occurs. On a projection image screen the image information is visualized by projecting it onto a reflective, non-afterglow medium by means of a light beam, for example a laser. When very bright image information is displayed in one image channel and dark image information is displayed in the other image channel, a projection image screen without afterglow avoids crosstalk between both channels. In principle, the invention is applicable to any projection screen, ie any projection of an image sequence on the screen. In particular it is applicable in connection with motion picture film projection.
The illumination of the filmstrip then projects the image onto a single projection screen that is viewed by multiple movie spectators. For the form according to the invention, the filmstrip must have alternating second row images and first row images. The shutter glasses are then driven by the projection device according to the image shown. A movie spectator may observe one or the other film, ie two different films or image contents. A movie spectator utilizing the first shutter glasses then sees the first film. A movie spectator utilizing the second shutter glasses views the second film independently of and unaffected by it. That is, both image sequences of the film are completely different from each other and contain image information that is unrelated to each other.

[Brief description of the drawings]

1 is a schematic circuit diagram of an embodiment of the device according to the invention.

2 (a) to 2 (f) are a row progress diagram for explaining a reading and reading process in an image memory, a signal diagram of a control signal for an optical filter means, and an explanatory diagram concerning an image content.

[Explanation of symbols]

 1, 2 Signal processing device 3, 4 Memory device 5 Control device 8 Image screen 10, 11 Observer 12, 13 Filter device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Manfred Pittschäider Federal Republic of Germany 81667 Miyunchen Sankt-Wolffgangs-Praztu 9ha (72) Inventor Gujunter Schiefler Federal Republic of Germany 80939 Miyunchen Karl-Olf-Bogen 83 (72) Inventor Ciutte Juan Prange Germany 81476 Miyunchen Forsten Leader Array 134

Claims (8)

[Claims] 1. A device for displaying at least two image sequences of unrelated content by a display device, a processing device (1 ... 7) for preparing the image sequences, and a first and a second image sequence. Display device (8) capable of alternately displaying the images of each of the images, the at least first and second optical filters being controlled by the processing device for viewing of the display device by different observers. An image train display device comprising devices (12, 13), each of which is optically transparent only during the display of the image of the image train. 2. A first video signal (Q1) having image information for a first image sequence (A1, B1, ...) And a first video signal having image information for a second image sequence (C1, D1, ...). A video signal processing device (1 ... 7), to which two video signals (Q2) can be applied, is provided, and image information for the first and second image columns is displayed on a display device for each image. Device according to claim 1, characterized in that it is applied alternately. 3. A half image (A) in which the video signals (Q1, Q2) are each divided into rows and which are engaged in the rows.
, B1, ...; C1, D1, ...), the video signal processing device includes video information (Q1, Q1).
2) each of which comprises means for alternately displaying each half-image, one half-image (A) of each of the first and second video signals.
1, C1, A2, C2, ...; B1, D1, B2, D2,
The device according to claim 2, wherein ...) are displayed alternately. 4. At least one for each of the video signals
4. Device according to claim 3, characterized in that it comprises one memory (3, 4) for each half-image and a read-out controller (5) for alternately reading one half-image completely from the memory. . 5. A half-image having a doubled row frequency is read out, and after the reading of one half-image of one video signal is completed, one half-image of the other video signal is read in each image. A read-out control device such that the read-out of the first and second video signals is started only from the memory and only after the half-images to be read have been read into each image memory by at least half. The device according to claim 4, wherein (5) is configured. 6. A row raster (α, β) is associated with each of the half images, the video signal processing device corresponding to the half image during the display of one of the half images of the display device. The device according to any one of claims 3 to 5, characterized in that it is arranged to be prepared. 7. Device according to claim 1, characterized in that the display device (8) is a projection image screen. 8. The optical filter device (12, 13) is a pair of glasses for one of the observers, the light transmission of which is controlled in relation to the control signals (S1, S2) generated by the processing device. Device according to any one of the preceding claims, characterized in that it is possible.