FR2562744A1 - COMPOSITE VISUALIZATION DEVICE - Google Patents

Abstract

THE INVENTION RELATES TO A COMPOSITE DISPLAY DEVICE. THIS DEVICE INCLUDES A DEVICE 22 WHICH PRODUCES A GROUP OF AT LEAST THREE COMPONENT IMAGES OF A SUBJECT, EACH OF THESE IMAGES BEING INVERTED IN AT LEAST ONE ASPECT WITH RESPECT TO THE OTHERS AND A DEVICE 220 COUPLES WITH THE IMAGE PRODUCTION DEVICE AND THAT COMBINES THE IMAGES TO FORM A COMPOSITE IMAGE OF THE SUBJECT. THE INVENTION APPLIES IN PARTICULAR TO THE FORMATION OF COLOR TELEVISION IMAGES.

Description

The present invention relates generally to an apparatus for

  visualization, and more particularly relates to an image forming device for producing three or more color component images of a subject and combining the images to view a single multi-color image of that subject.

  A viewing tube of the cathode ray type

  The diques generally comprise a tubular casing that contains an electron gun arranged to direct an electron beam scanning on a portion of a fluorescent output screen to produce a visible light image. The fluorescent screen may carry a suitable fluorescent substance that emits a light of the desired color as it receives electrons from the scanning beam. Thus, several cathode ray tubes may include fluorescent screens

  respective fluorescent materials

  annuities that produce color component images

  different from the same subject, and who are willing to

  throw the different images in color, superimposed on a projection screen. This results in visualization on

  the projection screen of a single image in several

  including discrete regions colored

  relative intensities of different colors

  in corresponding discrete regions of the images

  respective ones produced by each of the tubes

cathode rays.

  But it has proved difficult to produce

  cathode ray tubes with devices

  producing identical images of the same subject and of

  hold the tubes in precise optical alignment to achieve color alignment of the discrete regions of the image in multiple colors. Therefore, in the prior art, different types of cathode ray tubes have been developed, including fluorescent screens

  with different fluorescent substances for

  to draw an image in several colors. A mask-type cathode ray tube, for example, has a fluorescent screen consisting of nested groups of fluorescent dots, the dots of each group being a different fluorescent material which emits a corresponding color light when it receives electrons. an associated beam passing through aligned openings of the mask. In another example, a beam positioning type cathode ray tube has a fluorescent screen consisting of nested groups of fluorescent bands, the bands of each group being a different fluorescent material for localized emission of a color light. corresponding when it receives the electrons

  from a properly positioned electron beam

  tioned. In a third example, a voltage penetration type cathode ray tube includes a fluorescent screen consisting of superimposed layers of different fluorescent materials, the material of each layer being activated for localized emission of a corresponding color light when she receives

  electrons with an associated energy level of a

electron beam in scanning.

  Thus, cathode ray tubes of the types mentioned above include fluorescent screens: imposing complex deposition techniques or special fluorescent materials during manufacture, which

  increases the production price of these previous tubes.

  The object of the invention is therefore to eliminate these disadvantages of the prior art as well as

  others, thanks to a visualization device

  a device that produces a group of three or more images, arranged on a surface, and arranged in a manner have been developed, including fluorescent screens

  with different fluorescent substances for

  to draw an image in several colors. A mask-type cathode ray tube, for example, has a fluorescent screen consisting of nested groups of fluorescent dots, the dots of each group being a different fluorescent material which emits a respective color light when it receives electrons. an associated beam passing through aligned openings of the mask. In another example, a beam-positioning type cathode ray tube carries a fluorescent screen consisting of nested groups of fluorescent bands, the bands of each group being a different fluorescent material for a localized emission of a color light. respective when it receives the electrons

  from a properly positioned electron beam

  tioned. In a third example, a voltage penetration type cathode ray tube comprises a fluorescent screen consisting of superimposed layers of different fluorescent materials, the material of each layer being activated for a localized emission of a respective color light. when it receives electrons from an associated energy level of a beam

of electrons in scanning.

  Thus, cathode ray tubes of the types mentioned above have fluorescent screens imposing complex deposition techniques or special fluorescent materials during manufacture, which

  increases the production price of these previous tubes.

  The object of the invention is therefore to eliminate these disadvantages of the prior art as well as

  others, thanks to a visualization device

  a device that produces a group of three or more images, arranged on a surface, in a manner

  similar around a predetermined part of the over-

  face. Images can be positioned to be similarly directed in directions

  different from the said pre-part

  determined from the surface and can constitute respective component images of a subject. Each of the images is inverted in at least one aspect relative to

other pictures of the group.

  This display device also includes

  a device associated with the group to combine the three or more images and to form a single combined image. Thus, when the three or more images constitute respective component images of a subject, the only combined image that results is a composite image of the subject. Also, when the three images

  components or more are of different colors

  the resulting composite image constitutes an image

in several colors of the subject.

  The device that produces the group of three

  images or more may include a visualization

  cathode ray type comprising a tubular casing in which is disposed an electron gun which directs an electron beam on an output screen

  aligned with an image transmission part of the

  develops. The output screen consists of quadrants of respective fluorescent substances similarly arranged from a central portion of the screen and which are suitable for locally emitting light of the desired color in response to electron reception.

beam.

  The device that produces the group of three or more images may also include a device

  beam control associated with the electrical harness

  trons to deflect it sequentially on each of the quadrants while modifying the beam intensity of

  to produce the respective images. But the

  The electron beam is deflected on each of the quadrants for example by a conventional raster scan in an inverse manner under at least one aspect of that of which the beam is deflected over the other quadrants. By

  Therefore, the respective component images pro-

  quadrants are reversed in at least one

  aspect compared to each other.

  The image combining device of this display device may comprise a set

  optical combination disposed outside the

  veloppe of the tube and optically coupled by its image transmission portion with the image output screen of the tube. The optical combination assembly may comprise a network of optical devices aligned with each other.

  others and supported to receive the light of each

  each quadrant of the output screen and to direct it along respective paths of optical lengths

  equivalent. As a result, the light rays cor-

  Respondents from the quadrants reach the observer's eye by identical light paths; the

  respective images produced on the quadrants are ame-

  to be superimposed on each other on a common virtual image surface. In addition, the optical devices of the combination of images are arranged so that the mutually reversed images on the quadrants are oriented in a similar manner,

  views on the surface of common virtual images. By con-

  the eye of an observer placed beyond the exit of the optical combination set and looking at the

  along the optical axis sees a single combined image.

  So when the respective component images of a subject

  are produced on the quadrants with different colors

  the eye of the observer sees a single image

  site in several colors containing not only the

  colors of the respective component images, but

  their intermediate color blends

received.

  Other features and benefits of

  the invention will become apparent during the description which

go follow.

  In the accompanying drawings, given solely by way of non-limiting example: FIG. 1 is a schematic axial section of a display device according to the invention,

  FIG. 2 is a schematic view in perspective.

  of the optical combination assembly on the end

  output of the viewing tube of FIG. 1, this optical combination assembly being shown exploded for clarity, FIG. 3 is a plan view of the exit end of the viewing tube of FIG. 1, following the

  line 3-3, seen in the direction of the arrow, but

  born of 90 for clarity, FIG. 4 is a schematic perspective view of a variant of the optical combination assembly of FIG. 2, showing the optical path of the red light from a quadrant of the output screen, FIG. 5 is a schematic view similar to that of FIG. 4 but illustrating the optical path of the green light from a second quadrant of the output screen, FIG. 6 is a schematic view similar to that of FIG. 4 but showing the optical path of the blue light from a third quadrant of the output screen, FIG. 7 is a schematic view similar to that of FIG. 4 but showing the optical path of the blue light coming from a fourth quadrant of the output screen,

2562744 '

  FIG. 8 schematically represents a single combined image of the four images produced on the quadrants of the output screen of FIG. 3, as viewed by the observer's eye positioned as shown in FIG. 2, -

  FIG. 9 is an electrical diagram of the cir-

  fired of a composite frame generator shown in FIG. 1, Figs. 10A to 10H show the waveforms

  electrical signals produced by the circuit

  felt in FIG. 9, and FIG. 11 represents another variant of

  the optical combination assembly of FIG. 2,

  the optical path of blue light from

  a third quadrant of the output screen.

  Among the figures, in which like references designate identical elements, FIG. 1 represents a display device 20 in several

  colors comprising a tube 22 of the cathode ray type

  diques. The tube 22 comprises a casing 24 in the form of a funnel made of a suitable dielectric material, for example glass, whose axis 25 passes through an end neck 26 of the envelope. The neck 26 terminates at one end of the casing 24 by a base 28 sealed on its periphery and through which connection pins 29 pass hermetically. The pins 29 constitute a means for supporting and establishing electrical connections with respective elements of the connector. an electron gun 30 disposed

  axially in the neck 26 of the envelope 24.

  The electron gun 30 comprises a heating filament 32 disposed axially near the base 28 and inside an inverted cathode cup 36 whose closed end carries an outer coating (not shown) of a material that emits electrons under

  the effect of heat. The cathode cup 36 is dis-

  placed axially at a distance from a first inverted gate cup 38 comprising a closed end with a central opening aligned with the close end adjacent to the cathode cup 36. The closed end of the first inverted gate cup 38 is disposed in close proximity and in alignment with the end

  closed, with a central opening, a second

  gate shovel 42 directed upwards. A closed end with a central opening of an elongate focusing cup 46 is spaced within

  the open end of the second grid cup 42.

  The open end of the focus cup

  46 is the exit end portion of the barrel 30 from which an electron beam 40 is axially directed toward the opposite end portion.

  of the envelope 24. The electrodes 38, 42 and 46 of

  Beam 30 of the barrel are assembled and isolated from each other in the form of a subassembly for example fixed on several insulating rods 34 arranged

  axially and spaced angularly around the barrel 30.

  Similarly, the subassembly of the beam forming electrodes 38, 42 and 46 can be held on the axis 25 by a plurality of axially spaced collars 44 which surround the

  electrodes of the barrel 30 and which are tight against the sur-

inner face of the collar 26.

  The neck 26 is assembled jointly with a

  end portion 50 of larger diameter of the enve-

  loppe 24, with the interposition of a flared part 52 towards

  outside. The end portion 50 of larger diameter

  meter terminates with a front plate 54 sealed at its periphery, perpendicular to the axis 25 of the tube 22 and made of a transparent material, for example glass. An output image forming screen is deposited by any suitable means on the inner surface of the face plate 54 and consists of a layer of a material

2562744 '

  fluorescent light that emits light locally when

  that a basic region of this material receives

beam electrons 40.

  As more clearly shown in FIG. 2, the fluorescent layer of the screen 60 and the front plate 54 which supports it can have practically the same

  dimensions and corresponding rectangular shapes.

  Also, the fluorescent layer of the screen 60 and the front plate 54 may be considered as being divided into four sectors by two orthogonal planes

  53 and 55 which are perpendicular to the thicknesses

  of the fluorescent layer and the faceplate.

  The orthogonal planes 53 and 55 intersect at a central portion 61 of the screen 60 and define quadrants 56, 57, 58 and 59 of the fluorescent layer. The quadrants 56, 57, 58 and 59 therefore constitute corner portions

  of the rectangular fluorescent layer which have

  sides equal to each other and which are grouped symmetrically

  around a central portion 61 of the screen 60.

  The first quadrant 56 may be made of a suitable fluorescent material, such as europium-activated yttrium oxide, for example, which emits locally red light in response to the reception of electrons from the beam 40 The second quadrant 57 may be made of another fluorescent material, such as manganese-activated zinc silicate, which locally emits green light in response to incident electrons of the beam 40. The third quadrant 58 may be another fluorescent material, such as silver-activated zinc sulfide, which emits locally blue light when one of

  these regions is penetrated by electrons of the beam 40.

  The fourth quadrant may be made of another fluorescent material such as terbium-activated yttrium oxysulfide which locally emits blue light of longer wavelength than that emitted by the

  fluorescent material of quadrant 58 in response to the reception of

electron beam 40.

  Alternatively, the fourth quadrant 59 may be suitably fluorescent having persistence characteristics substantially different from those of the fluorescent substances of the other three quadrants 56, 57, and 58. As another alternative, the fourth quadrant 59 of FIG. Screen 60 may not be used because most of the colors perceived by the eye can be obtained by combining the primary colors, namely red, green and blue which are emitted by

  the fluorescent substances of quadrants 56, 57 and 58.

  On the inner surface of the screen 60 is an anode coating 62 of an electrically conductive material, such as aluminum which reflects visible light. The coating 62 extends not only over the entire inner surface of the end portion

  of larger diameter, but also extends axially-

  annular form in the flared portion 52 of the envelope 22. The anode coating 62 is connected

  electrically to a button 64 for working anode connection.

  hermetically pouring the wall of the flared portion 52 to establish an electrical connection with the electrode

anode of the tube 22.

  The anode connection button 64 and the cover

  Anode anode 62 is electrically connected to another anode coating 66 from the button 64 to the neck 26 of the envelope 24. The coating 66 is made of a suitable electrically conductive material by

  example in carbon, and it is arranged axially and annul-

  stretch along the inclined inner surface or

  flared 52 of the collar 26. Inside the collar 26, the covering

  anode 66 ends by surrounding it at a distance from the exit end portion of the barrel 30

  from which emanates the electron beam 40 directed axially.

  Thus, the anode coatings 66 and 62 form a

  anode electrode in the form of an inverted cup at the

  within which a field-free space is established.

  In operation, as schematically shown in FIG. 1, the cathode 36 of the barrel 30 may be electrically connected by a conductor 68 to a cathode voltage terminal of a polarized voltage source 70. The control gate electrode 38 of the barrel 30 may be electrically connected by a conductor 72. to one

  voltage terminal of the source 70 which is negative

  the second grid electrode 42 of the barrel 30 may be electrically connected by a conductor 74 to an associated voltage terminal of the source 70, with respect to the cathode voltage terminal. which is more positive than the cathode voltage terminal; and the focusing electrode 46 of the barrel 30 can be electrically connected by a conductor 76 to an associated voltage terminal of the source 70 which is even more positive than the cathode voltage terminal of the

  source 70. The anode terminal button 74 may be connected

  The electrode 70 is electrically biased by a conductor 78. An anode voltage terminal of the source 70 which is very electrically positive with respect to the cathode voltage terminal of the source 70. Thus, the beam forming electrodes 38, 42 and 46 of the barrel 30 and the cup-shaped anode electrode of the tube 22 are held at appropriate electrical potentials with respect to the potential of the cathode 36 to focus the beam electrons at a small dot on the image screen 60 and produce thus a localized emission of visible light by the elemental region penetrated with fluorescent substance

  in one of the quadrants 56, 57, 58 and 59 of the screen 60.

  A beam deflection assembly 80 has a coupling device with the beam consisting of an electromagnetic block. 82 which surrounds the outer surface of the neck 26 near the flared portion 52 of the envelope 24 so that the electron beam 40 exiting the barrel 30 passes through the block 82. The latter consists of an electromagnetic evasion device

  beam comprising two vertical deflection coils

  opposed and interconnected holdings (not shown) which

  are excited to deflect beam 40 'in directions

  contrasting vertical tios from Plan 53 as the

  indicate the co-linear vertical vectors 63 and 65. The vertical deflection coils of the block 82 are electrically connected by a conductor 81a to a conventional vertical deflection amplifier 85 which receives signals through a conductor 75 from a frame generator 86 composite. The generator 86 of composite frame

  receives attack signals from

  71a and 71b from a conventional circuit 88 of synchronization signals constituting an element of a

source 87 of control signals.

  Block 82 also has two opposed and interconnected horizontal deflection coils (not shown) which are energized to deflect electron beam 40 in opposite horizontal directions toward plane 55 (Fig. 2) as indicated by frizontal vectors. linear lines 67 and 69 which are perpendicular to the respective vertical vectors 63 and 65 respectively. The horizontal deflection bobbins 82 are electrically connected by a conductor 81b to a conventional horizontal deflection amplifier 83 which receives signals via a conductor 77 from the generator 86 of composite frame. The composite frame generator 86 also receives signals through a conductor 79 from a video signal circuit 89 constituting another element of the control signal source 87. The generator 86

2562744 '

  composite frame delivers output signals by an electrical conductor 194 to a video amplifier 84 which

  is connected in order to transmit corresponding signals

  The conductor 72 leads to the control gate electrode 38 of the tube 22. As shown in FIG. 9, in the composite frame generator 86, the output of the synchronization signal circuit 88 is electrically connected not

  71a and 71b conductors at the inputs of conventional generators

  90 and 92 vertical and horizontal scanning.

  Also, the conductor 71a is connected to an input of a counter-divider counter 94 whose driving output is connected to an input of another counter divide-by-two counter. As a result, an attack signal

  in the form of a clock signal is applied to the input of the gen-

  90 and the counter 94. As the

  shows FIG. 10A, the driving signal from the cir-

  bake 88 of synchronization signals may be represented by a waveform 91 containing clock pulses 93 uniform in the positive direction with respect to a baseline 91a with respect to time and regularly spaced,

  that is, appearing at equal periods. The frequency

  repetition rate or the frequency of the pulse

  box 93 is equal to the vertical scanning frequency

  read for each of the respective quadrants 56, 57, 58 and 59

of the screen 60.

  The vertical scanning generator 90 delivers at its output a vertical scanning voltage signal which, as shown in FIG. 0 IB, may be represented by a positive sawtooth waveform 95 whose period

  is equal to that of waveform 91 of FIG. 10A.

  The output of the vertical scan generator 90 is

  connected to the electrical earth by two resistance elements

  in parallel with potentiometers 98 and 99 of a vertical control unit 97. The potentiometers 98 and

  99 control the vertical dimension of the bal-

  by the electron beam 40 on the quadrants 56, 57, 58 and 59 of the screen 60. The ground end of the resistive element of the potentiometer 98 is connected by a resistor 100 to an inverting input (- ) of an amplifier 102 which is connected by another resistor

  103 at the output of the amplifier 102. Similarly,

  the earth end of the resistive element of the potentiometer 99 is connected by a resistor 101 to an inverting input (-) of an amplifier 104, which is connected by another resistor 105 to the output of

the amplifier 104.

  The non-inverting input (+) of the amplifier 102 is connected by a resistor 106 to the cursor of the vertical height control potentiometer 98 and by a resistor 107 to the slider of a potentiometer 108 of

  vertical position control. But unlike the

  102, the non-inverting input (+) of the amplifier

  104 is connected by a resistor 109 to the

  electrical ground. The inverting input (-) of the amplifier

  104 is connected by a resistor 110 to the slider of the vertical dimension control potentiometer 99 and a resistor 111 to the slider of a potentiometer 112.

  vertical position control. The same value of

  polarization can be applied to resistive elements

  potentiometers 108 and 112 for vertical position control

  hold or different values of polarized voltages

  may be applied across these

  at will. Potentiometers 108 and 112 provide the ability to vertically position the color images produced on the respective quadrants 56, 57, 58 and 59 of the screen 60 to optically overlap each other to display a single color image. Thus, the amplifier 102 is connected for

2562744 '

  producing at its output a vertical scanning voltage signal having the same polarity as the combined voltage input signals received at the non-inverting input (+) of the vertical dimension control potentiometer 98

  shim and potentiometer 108 of vertical position control. On the other hand, the amplifier 104 is connected to produce at its output a vertical scanning voltage signal having a polarity opposite to that of the combined input signals received at its inverting input (-) of the vertical dimension control potentiometer 99. and the vertical position control potentiometer 112. The

  amplifiers 102 and 104 can be a double amplifier

  operational semiconductor processor such as the model OP AMP MC 1747 distributed by Motorola Semiconductor Products,

Pheonix, Arizona.

  The horizontal scanning generator 92 delivers at its output a horizontal scanning voltage signal which, as shown in FIG. 10H, can be represented by

  sawtooth waveforms 174 and 175 respectively

  each having a suitable period to scan once any of the respective quadrants 56, 57,

  58 and 59 of the screen 60. The output of the generator 92 of

  The horizontal wiring is connected to a conductor 73 itself connected to the electrical ground by two respective resistive elements of potentiometers 114 and 115 in the horizontal control unit 116. The potentiometers 114 and 115 control the horizontal dimension of the regions swept by the electron beam 40 on the quadrants 56, 57,

  58 and 59 of the screen 60. An end to the mass of the

  resistive state of the potentiometer 114 is connected by a

  resistor 118 to an inverting input - (-) of an amplifier

  120, which is connected by another resistor 123 to the output of the amplifier 120. Similarly, the ground end of the resistive element of the potentiometer 115 is connected by a resistor 121 to an inverting input (-) an amplifier 122, connected by another

  resistor 125 at the output of amplifier 122.

  The non-inverting input (+) of the amplifier is connected by a resistor 126 to the slider of the horizontal dimension control potentiometer 114 and by a resistor 127 to the slider of a potentiometer

  128 horizontal position control. But contrary

  At the amplifier 120, the non-inverting input (+) of the amplifier 122 is connected to the electrical ground

  by a resistor 129. The inverting input (-) of the

  plifier 122 is connected by a resistor 130 to the slider of the potentiometer 115 of. dimension control

  horizontal and by a resistance 131 to the potentials cursor.

  tiometer 132 horizontal position control. A polarized voltage of the same value can be applied to the resistive elements of the potentiometers 122 and 138 of horizontal position control or different values of polarized voltages can be applied at will to each of these resistive elements. The 128 knobs

  and 132 give the possibility to position horizontal-

  images produced on the respective quadrants 56, 57, 58 and 59 of the screen 60 so that they can be optically superimposed on each other in order to

  view a single image in multiple colors.

  Thus, the amplifier 120 is connected for

  produce at its output a horizontal scanning voltage signal

  zontal having the same polarity as the combined voltage input signals received at its non-inverting input (+)

  from the control potentiometer 114 of horizontal dimension

  zontal and potentiometer 128 horizontal position control. On the other hand, the amplifier 122 is connected to produce at its output a horizontal scanning voltage signal having the inverse polarity of that of the combined input signals received at its inverting input (-) of the horizontal dimension control potentiometer 115 and

  of the horizontal position control potentiometer 132.

  The amplifiers 120 and 122 may also be a dual operational semiconductor amplifier as

* the model OP AMP MC 1747 broadcast by Motorola Semiconduc-

  tor Products of Phoenix, Arizona. The outputs of the non-inverting amplifier 102 and the inverting amplifier 104 of the vertical control unit 97 are connected by leads 134 and 135 to the moving contacts of scan switches.

  142 and 143 of a switching unit 140. Egale-

  The outputs of the non-inverting amplifier 120 and the inverting amplifier 122 of the horizontal control unit 116 are connected by leads 136 and 137 to the moving contacts of the horizontal scanning switches 144 and 145 of the control unit. switching 140. The elements

  actuating the vertical scanning switches 142 and 143

  cal are connected by leads 146 and 147 to respective outputs of counter divide-counter 94 which is driven by the clock signal from synchronization signal circuit 88. In addition, the control elements of switches 144 and 145 of horizontal scanning are connected by leads 148 and 149 to the respective outputs of the other counter divide counter 96 which receive the output signals of the counter 94. The fixed contacts of the switches 142 and 143 are connected in common to an output conductor 151 vertical scanning. In addition, the fixed contacts of the switches 144 and 145 are connected

  in common with a horizontal scan output driver 152

  zontal. The counter 94 therefore applies on the output conductors 146 and 147 voltage signals which, as shown in FIG. 10C, may be represented by rectangular waveforms 153 and 154. Each of the waveforms 153 and 154 contains positive voltage pulses 155 and 157 appearing regularly and which are separated by zero voltage intervals 156 and 158. Also, each of the waveforms 153 and 154 has a period that is substantially equal to the period of the clock signal 91 of FIG. 10A. But unlike the clock pulses 93 of the waveform 91, each of the positive voltage pulses 155 and 157 as well as each of the

  zero voltage intervals 156 and 158 which are

  stalled to a length or duration that is practically

  equal to an entire period. Moreover, when an impulse

  Clock 93 appears in waveform 91 and a corresponding positive voltage pulse 157 appears in waveform 154, a zero voltage interval 156 lasting one period appears in the form Conversely, when a next clock pulse 93 appears in the waveform 91 and a corresponding positive voltage pulse 155 appears in the waveform 153, a zero voltage interval 158 of a duration of one period appears in the form

wave 154.

  When the counter 94 receives a pulse of

  clock voltage of the circuit 88 of synchronization signals

  tion, it therefore suppresses the corresponding excitation voltage signal of one of its output conductors, such as the conductor 146, and applies it to the other output conductor 147. At the end of a period, the counter 94 receives a next pulse of clock voltage from circuit 88

  synchronization signals and transfers the correct signal

  respondent of excitation voltage of the output conductor 147 to the output conductor 146. This results from the reception of the circuit 88 of synchronization signals of a permanent train of clock voltage pulses spaced a period, that the counter 94 alternately applies the corresponding excitation voltage signal as respective pulses of duration of one period to each of these output leads 146 and 147, sequentially and

2562744 '

  repeatedly. Thus, when the conductor 94 applies an excitation voltage pulse to the lead 147, for example, the connected control element of the switch 143 is energized to keep the moving contact electrically disconnected from the fixed contact of the switch 143. This results that the output of the vertical inverter amplifier 104 is disconnected from the vertical scan output conductor 151. At the same time, the counter 94 suppresses the excitation voltage pulse of the output conductor 146, so that the connected control element

  of the switch 142 is de-energized. Therefore, the

  The movable tact of the switch 142 can come into electrical contact with its fixed contact and connects the output of the vertical non-inverting amplifier 102 to the vertical scan output conductor 151. Therefore, the

  amplified vertical scanning voltage produced by the

  non-reversing ply 102 is applied to the driver

  151 for the duration of a period.

  At the end of the period, when the counter 94 clears the excitation voltage signal from the output lead 147 and applies it to the output lead 146, the control element of the switch 142 is energized to maintain its disconnected moving contact. electrically from the fixed contact of this switch. As a result, the exit

  of the vertical non-inverting amplifier 102 is decon-

  connected to the vertical scan output conductor 151.

  At the same time, the control element of the switch 143

  is de-energized and allows the mobile contact of this switching

  143 to come into electrical contact with his contact

  fixed. Therefore, the output of the invert amplifier

  vertical speaker 104 is connected to the output conductor 151

  vertical scanning. Therefore, the tension of

  The inverted vertical yage produced by the amplifier 104 is applied to the vertical scan output conductor 151. Thus, the counter 94 is driven by the clock voltage signal from the synchronization signal circuit 88 to alternately apply the excitation voltage signal corresponding to the driving signals.

  outlets 146 and 147. As a result, the

  vertical scanner 142 and 143 are de-energized

  every other period to connect the outputs of the amplifiers

  102 and 104 alternatively to the driver of

  vertical scan output 151. Therefore, the

  The driver 151 receives a composite vertical scan voltage signal which, as shown in FIG. 10F, can be represented by a waveform 166 with a line

  the basic time 167 from which are directly

  reverse and non-inverted vertical scan voltage pulses, 168 and 169. The voltage pulses of

  non-inverted vertical sweeps 168 increase progressively

  from base line 167 to a positive peak and then decrease abruptly to baseline 167. On the other hand, inverted vertical scan voltage pulses 169 have been progressively decreasing since

  baseline 167 to a negative peak and increase

  then move sharply to base line 167.

  The counter 96 controlled by output pulses of the counter 94 apply on its output leads 148 and 149 voltage signals which, as shown in FIG. 10D, may be represented by waveforms 159 and 160 containing positive voltage pulses 161 and 163 appearing regularly and which are

  separated by zero voltage intervals 162 and 164.

  Each of the waveforms 159 and 160 has a respective period

  which is substantially equal to twice the periods of the waveform 91 of FIG. 10A and waveforms 153 and 154 of FIG. 10C. Also, each of the pulses 162 and 164 has a length or duration that is equal to an integer period of the associated waveforms 159 and 160. Moreover, when a positive voltage pulse 163 appears in the waveform 160, a zero voltage interval 162 with a duration of one period appears in the waveform 159; and when a next positive voltage pulse 161 appears in the waveform 159, a next zero voltage interval 164 of a duration of one second.

  period appears in waveform 162.

  Therefore, when the counter 96 receives successive pulses from the counter 94, it suppresses an excitation voltage signal from one of these output conductors, such as the conductor 148, and applies the excitation voltage signal to the counter. other output conductor

  149. As a result, the control element of the switching

  horizontal driver 145 is excited to maintain contact

  mobile disconnected electrically from its fixed contact.

  Thus, the output of the inverting amplifier 122 of the uni-

  horizontal control unit 116 is disconnected from the

  152 horizontal scan output. Simultaneously, the control element of the horizontal switch 144 is de-energized, thus allowing the moving contact to come into operation.

  electrical contact with the fixed contact of this switch.

  Therefore the output of the non-inverting amplifier of the horizontal control unit 116 is connected to the horizontal scan output lead 152 during

a period of double length.

  When the counter 96 has received two more successive pulses from the counter 94, it suppresses the excitation voltage signal from the output conductor 149 and transfers it to the output conductor 148. As a result, the control element of the switch horizontal 144 is excited to maintain its movable contact electrically disconnected from its fixed contact. Thus, the output of the non-inverting amplifier 120 of the horizontal control unit 116 is disconnected from the horizontal scan output lead 152. Simultaneously the control element of the horizontal switch 145 is de-energized thus allowing its moving contact to come into electrical contact with its fixed contact. Therefore, the output of the inverting amplifier 122 of the horizontal control unit 116 is connected to the horizontal scan output lead 152 for a period of double length. Therefore, the counter 96 is controlled by a pulse train from the counter 94 and alternately applies an excitation voltage signal corresponding to these output leads 148 and 149 for periods of double length. As a result, the horizontal switches 144 and 145 are actuated

  alternatively to connect the non-inverting amplifier

  120 and the inverter amplifier 122 to the driver of

  output 152 during repetitive periods of double

  LATIONS. Thus, the output conductor 152 receives a horizontal scanning signal which, as shown in FIG. lOG,

  can be represented by a horizontal scanning waveform

  composite zontal 170 with a baseline 171 in time from which envelopes are directed

  alternating positive and negative 172 and 174. A comparison

  sound of the composite horizontal sweep waveform of FIG. 10G with vertical sweep waveform

  composite 166 of FIG. 10F indicates that the positive envelope

  172 of the waveform 170 corresponds to inverse and non-inverted successive pulses 168 and 169 of the waveform 166. Also, the following negative envelope 173 of the waveform 170 corresponds to successive pulses not reversed and reversed 168 and 169 of the

  waveform 166. In FIG. 10H, it appears that

  along the base line 171 of the waveform 170 of FIG. 10G, that each of the positive envelopes 172 consists of a succession of positive sawtooth pulses 174 having a period suitable for scanning any of the respective quadrants 56, 57, 58 and 59 of FIG.

2562744 '

  the screen 60. Also, each of the negative envelopes 173 consists of a succession of negative pulses in

  saw teeth 175 of opposite polarity to that of the im-

  positive pulses 174 and a suitable period to scan any of the respective quadrants 56, 57,

58 and 59 of the screen 60.

  To return to Fig. 9, the conductors 151 and 152 transmitting the scanning signals are connected to respective inputs of a geometric correction module 150. Since screen 60 is

  placed on the flat inner surface of the frontside

  In the output channel 52, which is scanned by the electromagnetically deflected electron beam 40, it may be necessary to incorporate in the scanning signals carried by the conductors 152 and 153 corrections for the non-linearity and the scanning distortions. in frame on the respective quadrants 56, 57, 58 and 59. The geometric correction module 150 may be of the type

  INTRONICS C104 distributed by Intronics, Newton, Massachu

  setts for example, used to regularly synthesize a correction function that gives an approximation

  close of an exact mathematical correction function.

  Thus, the geometric correction module 150 consists of a linearity compensation circuit which eliminates bunching and other distortion that can occur non-uniformly from one image to another in the images.

  sequentially produced on the quadrants of the screen 60.

  The geometric correction module 150 comprises outputs

  connected by conductors 75 and 77 to amplifiers

  85 and 83 of vertical and horizontal deflection.

  The vertical deflection amplifier 85 is connected by a conductor 81a to the vertical deflection coils of the block 82; the horizontal deflection amplifier 83is connected by a conductor 81b to the deflection coils

horizontal block 82.

2562744 1

  Thus, the vertical scanning signals and

  applied to the respective winding coils

  vertical and horizontal 82 cause the electron beam 40 is electromagnetically deflected for a scan, line by line for example on regions

  predetermined levels of quadrants 56, 54, 58 and 59.

  as shown in Fig. 3, on quadrants 56,

  57, 58 and 59 of the screen 60 have produced light frames

  176, 177, 178 and 179 each of which is defined by a distinct color light emitted locally by increments receiving electrons from the associated fluorescent substance. Thus, red light is emitted by the frame 176; of the green light is emitted by the

  frame 177; and blue light in long strips

  The shorter and longer wavelengths are emitted by frames 178 and 179. The persistence of the light emitted by the respective fluorescent substances and the rate of regeneration of the electron beam 40 deviated from the persistence of the vision help to

  ensure that frames 176 to 179 are visible simultaneously

  on the respective quadrants 56 to 59 of the screen 60.

  In addition, to produce symmetrical component images of the same subject on the respective quadrants 56 to 59, the vertical and horizontal scan signals cause the beam 40 to be deflected in a predetermined manner to scan each of frames 176 to 179 of a different way. As shown in FIG. 10F, the composite vertical scan waveform 160 contains

  a first sawtooth pulse 168 directed positively

  Starting from the base line 167 of the waveform 160 when the electron beam 40 can be considered as lying in the plane 53 shown in FIG. 3. Therefore, the frame 176 of the quadrant 56 is scanned vertically by the electron beam 40 deflected from the plane 53 in the direction of the vertical vector 63. Also, as shown in FIG. 10G, the composite horizontal scan waveform 170 contains a

  first envelope 172 in the positive direction to

  firing from the base line 171 of the waveform 170 and having an initial half-length appearing simultaneously with the complete sawtooth pulse 168 of the

  waveform 166. As shown in FIG. 10H, the enve-

  loppe 172 consists of a repetitive series of uniform sawtooth pulses 174 having sloped rear flanks from a uniform positive maximum value and ending on the base line 171 of the waveform, which can be considered as corresponding to the position of the electron beam in the plane 55 of the

  Fig. 3. Thus, the frame 176, although scanned vertically

  in the direction of the vertical vector 63, is

  yee repetitively in the horizontal direction of the horizontal vector 67. Therefore, since the

  frame 176 is scanned in the usual manner.

  reading a page of a book, it can be used as a standard for scanning other frames 177 to 179

  can be compared for illustration.

  As shown in FIG. 10F, when the first complete sawtooth pulse 168 reaches its maximum positive value, it rapidly decreases to the base line 167 of the waveform 166 which corresponds to the

  return of the electron beam 40 to the plane 53. An impulse

  next saw tooth 169 is negatively directed from the base line 167 of the waveform 166 and appears simultaneously with the other half-length of the first full envelope 172 of the waveform 170. therefore, returning to the positive sawtooth pulses 174 of FIG. 10H and in FIG. 3, it appears that the frame 177 on the quadrant 57 is scanned by the electron beam 40 deflected vertically from the plane 53 in the direction of the vertical vector 65 while it is

  deviated repeatedly in the horizontal direction

  In this way, the frame 177 is scanned horizontally in the same direction as that used for the horizontal scanning of the frame 176, but it is scanned vertically in the opposite direction.

  relative to the vertical scanning of the frame 176.

  To return to Fig. 10F, when the negative sawtooth pulse 169 reaches a minimum value, it rapidly increases to the base line 167 of the waveform 160 which corresponds to the return of the beam of

  scan 140 in the plane 53 of FIG. 3. Thus, it appears

  In the waveform 160, a second sawtooth pulse 168 is positively directed with respect to the base line 167 of the waveform 166. As a result, the frame 178 of the quadrant 58 is scanned vertically by the beam. of electrons 40 deflected from the plane 53 in the direction of the vertical vector 63. Also, as

  shown in FIG. 10G, the horizontal scanning waveform

  composite zontal 170 contains a first complete envelope 173 in the negative direction from the base line 171 of the waveform 170 and has an initial half-length occurring simultaneously with the second sawtooth pulse 168 of the form As shown in FIG. 10H, the envelope 173 consists of a repetitive series of uniform sawtooth pulses 175 having rear flanks inclined from uniform negative peak values and terminating on the

  base line 171 of the waveform 170 when the

  Electron beam 40 may be considered as being in plane 55 of FIG. 3. Therefore, the frame 178, although scanned vertically in the direction of the vertical vector 63, is repetitively scanned in the horizontal direction by the electron beam 40 deflected repetitively towards the plane 55 in the direction of the vector

  horizontal 69. Thus, the frame 178 is scanned vertically

2562744 '

  in the same direction as the vertical scan

  frame 176 but it is scanned horizontally in the opposite direction of the horizontal scanning of the frame 176. As shown in FIG. 10F, when the second sawtooth pulse 168 reaches a positive peak value, it rapidly decreases to the base line 167 of the waveform 166 which corresponds to the return of the electron beam 40 in the plane 53 of FIG. 3. Then, it appears in waveform 166 a

  next pulse sawtooth 169 directed negative-

  from the base line 167 of the waveform

  166 and simultaneously with the other half-length of the

  A complete negative envelope 173 of the waveform 166. Therefore, returning to the negative sawtooth pulses 175 of FIG. 10H and in FIG. 3, it appears

  that the frame 179 of the quadrant 59 is scanned by the

  electron beam 40 deflected vertically from the plane 53 in the direction of the vertical vector 65 while being

  deviated repeatedly in the horizontal direction of the

  horizontal rotor 69. Thus, the frame 179 is scanned vertically

  radially and horizontally in directions opposite to those of the vertical and horizontal scanning of the frame 176. Therefore, considering the vertical vectors 63 and 65, it appears that all the frames 176 to 179 are scanned vertically from the plane 53 and towards the outside of the screen 60, towards one or other of the opposite ends. Also, referring to the horizontal vectors 67 and 69, it appears that all the frames 176 to 179 are scanned horizontally from one or other of the opposite sides of the screen 60 and inwardly, in the Accordingly, all the frames 176 to 179 are symmetrically grouped around the center 61 of the screen 60 at the location where the planes 53 and 55 intersect. In addition, the frames 177 and 179 are scanned inversely in the vertical direction from the plane 53, compared to the vertical scanning of the frames 176 and 178. In addition, the frames 178 and 179 are scanned in the horizontal direction towards the plane 55 , compared to the horizontal scanning of the frames 176 and 177. Therefore, each of the frames 176 to 179 is scanned at least in a direction which is opposite

  to those of scanning the other three frames.

  As shown in FIG. 9, in addition to being connected

  to the control elements of the vertical switches

  142 and 143, the output leads 146, 147 are also

  connected to the respective inputs of a decoder 180 of the current type. In addition, the output leads 148, 149 of the counter 196 in addition to being connected to the control elements of the horizontal switches 144 and 145, are also connected to the respective inputs of the decoder

  180. The latter has four electrically connected outputs

  by drivers 182, 183, 184 and 185 to

  control elements of the light control switches

  186, 187, 188 and 189. The fixed contacts of the

  brightness controllers 186, 187, 188 and 189

  are connected in common by the driver 194 to the amplifier

  video indicator 84 whose output is connected by the conductor 72 to the control grid 38 of the tube 22. The movable contacts of the switches 186, 187, 188 and 189 are electrically connected by conductors to the sliders of the brightness control potentiometers 190, 191 , 192 and 193. The ends of the resistive elements of the brightness control potentiometers 190 to 193 are connected in common by the conductor 79 to the output of the video signal circuit 89 in the control signal source 87. In addition, the ends opposing resistive elements of the brightness control potentiometers at 193 are connected in common to the electrical ground

by a driver 195.

  Thus, the decoder 180 is connected for detecting

  ter at its inputs if the excitation voltage signals are removed from the respective driver combinations

  146 to 149 to close an associated combination of

  vertical and horizontal scanning probes 142, 143 and 144, 145. As a result, the decoder 180 is used.

  to simultaneously suppress an excitation voltage signal

  the respective one of these output conductors

  at 185 to close the one associated with the com switches

  Accordingly, when an appropriate combination of vertical and horizontal scan signals are applied by the output leads 151 and 152 to scan a particular one of the frames 176 to 179, a corresponding control signal of brightness

  is applied by the output conductor 194 to the amplifier

video editor 84.

  Consequently, the decoder 180 delivers on its output conductors 182 to 185 respective voltage signals which, as shown in FIG.

  be represented by waveforms 196 to 199. In combination

  parant the waveforms of Figs. 10C, 10D and 10E, it appears that a zero voltage interval 200 of a duration

  of a periodereproduct in the simultaneous waveform 196

  nally with the first full zero voltage interval 156 in waveform 153 and with an initial half-length of the first full zero voltage interval 162 in waveform 159. Also, a zero voltage sequential interval 201 a period of one period appears in the waveform 197 simultaneously with a first complete zero voltage interval 158 in the

  Waveform 154 and with the other half length of inter-

  Zero voltage value 158 in waveform 159. In addition, a zero voltage sequential interval 202 of one period duration appears in waveform 198 simultaneously with a second zero voltage interval.

  156 in waveform 153 and with an initial half

  the first full zero voltage interval

  164 in waveform 160. Then another

  time period zero voltage sequence 203 appears in waveform 199 concurrently with a second zero voltage interval 158 in the

  waveform 154 and with the other half-length of

  Zero voltage value 164 in the waveform 160. At the end of the zero voltage interval 203 of the waveform 199, another zero voltage interval 200 of a duration of one period appears in the waveform 199 simultaneously with a third voltage interval

  zero 156 in waveform 153 and with one half

  initial length of a second zero voltage interval

  162 appearing in waveform 159. Thus, the

  sequential generation of the zero voltage gaps 200, 201, 202, and 203 in the respective waveforms 196, 197, 198, and 199 are repeated continuously during the

scanning frames 176 to 179.

  Also, comparing the waveforms of Figs. 10E, 10F, and 10G, it appears that the zero voltage gap 200 in waveform 196 occurs simultaneously with the first full sawtooth pulse 168 in the composite vertical scan waveform 166 and with the initial half-length of the first complete envelope 176 of the composite horizontal scan waveform 170. Further, the zero voltage range 201 of the waveform 197 appears simultaneously with the first full sawtooth pulse 169 in the composite vertical scan waveform 166 and

  with the other half-length of the first envelope

  plete 172 of the composite horizontal scan waveform 170. In addition, the zero voltage gap 202 of the waveform 198 appears simultaneously with the second complete sawtooth pulse 168 in the composite vertical scan waveform 166 and with the initial half of the first full envelope. 173 in the composite horizontal scan waveform 170. On the other hand, the zero voltage gap 203 of the waveform 199 appears simultaneously with the second full sawtooth pulse 169 in the composite vertical scan waveform 166 and with the other half-length of the first complete envelope

  173 in the horizontal scan waveform 170 consisting of

site.

  Thus, according to FIG. 9, when the vertical and horizontal scan switches 142 and 144 are closed for scanning the frame 176, the brightness control switch 186 is closed simultaneously so that the setting of the potentiometer 190 sets the average brightness level of the red light emitted by the weft

  176. Also, when the switches 143 and 144 of

  vertical and horizontal yage are closed for scanning

  of the frame 177, the light control switch 187

  sity is closed simultaneously so that the setting of the potentiometer 191 controls the average brightness level of the green light emitted by the frame 177. Moreover, when

  the switches 142 and 145 for vertical and horizontal scanning

  zontal are closed for scanning the frame 178, the

  188 brightness control switch is closed simul-

  Meanwhile, the setting of the potentiometer 192 controls the average brightness level of the blue light emitted by the frame 178. When the switches 143 and vertical and horizontal scanning are closed for scanning the frame 179, the control switch brightness 189 is closed simultaneously so the

  setting of the potentiometer 193 controls the level of

  average of the blue light emitted by the frame 179.

  It should be noted with reference to FIG. 9 that an input video signal can be provided by a video signal circuit 89 in the control signal source 87 and by

  driver 79 to be applied to the resistance elements

  Accordingly, instantaneous variations of the input video signal are detected at the brightness control potentiometer sliders 190 to 192 and produce corresponding instantaneous variations in the signal provided by the one of the brightness control potentiometers 190 to 192. closed switches 186 to 189 on the

  common output conductor 194 which is connected to the

  As a result, the output signal containing the corresponding instantaneous variations is amplified and applied by the driver 72 to the control gate 38 of the electron gun 30. The resulting instantaneous variations of the electrical potential of the the control gate 38 cause corresponding instantaneous variations in the intensity of the beam

  40 outgoing from the barrel 30. Thus, when the

  Electron beam 40 scans a particular frame 176 to 179, its average intensity is controlled by the setting of the associated one of the brightness control potentiometers 190 to 193 while the instantaneous intensity of the beam 40 is controlled by the variations snapshots of the associated parts of the input video signal that contains

information data.

  Therefore, and as shown in FIG. 3; when

  the electron beam 40 scans the frame 176, its inten-

  The character 204 represents a completely red R portion of a subject to be displayed and the character 205 represents a red component of a yellow part. The character 204 may be modified to produce alphanumeric characters 204, 205, 206 and 207 on the frame 176. Y of the subject. Similarly, the character 206 represents a red component of a white portion W of the subject and the character 207 represents a red component of a purple portion P of the subject. In addition, when the electron beam 40 sweeps

2562744 '

  the frame 177, its instantaneous intensity can be modified

  The character 208 represents a wholly green portion G of the subject and the character 209 represents a green component of the yellow part Y of the subject; the character 210 represents a green component of the white part W of the subject. But

  since frame 177 is scanned in one direction

  vertically opposite that of the vertical sweep of the

  frame 176, the characters 208 to 210 are vertically inverted

  compared with characters 204 to 207. Also, in the vertical direction, characters 209 and 210 of

  frame 177 consist of vertically inverted replicas

  calais characters 205 and 206 of the frame 176.

  Moreover, when the electron beam 40 scans the frame 178, its instantaneous intensity can be modified

  to produce in this frame 178 alphanumeric characters

  212, 213 and 214. The character 212 represents a completely blue part P of the subject, the character 213 represents a blue component of the purple part P of the subject and the character 214 represents a blue component of the white part W of the subject. Since the frame 178 is scanned in the horizontal direction opposite to

  that of the horizontal scanning of the frame 176, the characters

  212 to 214 of the frame 178 are inverted horizontally

  relative to the respective characters 204 to 207 of the frame 176. Also in the horizontal direction, the respective characters 213 and 214 of the frame 178 are symmetrical images of the characters 207 and 206 of the frame

176.

  In a similar way, when the elec-

  trons 40 scans the frame 179, its instantaneous intensity can be modified to produce in this frame 179 alphanumeric characters 216, 217 and 218. The character 216 represents the entirely blue part B of the subject; the character 217 represents the blue component of the part

2562744'-

  purple P of the subject and the character 218 represents the blue component of the white part W of the subject. But since the frame 179 is scanned vertically and horizontally in opposite directions to that of the vertical and horizontal scanning of the frame 176, the characters 216 to 218 in the frame 179 are vertically and horizontally inverse to the characters 204 to 207 of FIG. the frame 176. Also, the characters 216

  at 218 of the frame 179 are vertically inverted replicas

  cal character equivalent 212 to 214 of the frame 178. In addition, the character 218 is a symmetrical image

  the equivalent character 210 of the frame 177.

  Thus, in addition to each of the frames 176 to 179 being scanned in at least one direction relative to the scan coordinates of the other three frames, the characters produced on each of frames 176 to 179 are oriented correspondingly with respect to characters produced on the other three frames. In addition, each of the frames 176 to 179 is scanned by the beam 40 relative to the center 61 of the screen 60 so that corresponding increments of the frames 176 to 179 are addressed in the same sequential order and at equal intervals of the scanning period. Thus, the respective characters common to several frames 176 to 179 are positioned symmetrically with respect to the center 61 of the screen 60. Also, unique characters for any one of the frames 176 to 179 are positioned by

  center 61 of screen 60 so that

  corresponding parts of the other three frames are left

  blocked. As a result, the screen 60 can be optically folded along the lines defined by the intersection planes 53 and 55 so that duplicate components of the characters produced on several frames overlap and unique characters for a frame do not.

  do not cover a character of another frame.

  As shown in Figs. 1 and 2, the provision

  visualization system 20 comprises for this purpose an

  There appear to be 220 optical combinations which is disposed outside the tube 22 and which is optically coupled with the screen 60 through the front plate 54. The set of optical combinations 220 may comprise a mirror 224.

  aligned with quadrant 56 and whose reflective surface

* health is disposed at an acute angle with respect to the front plate 54, for example 45, measured in sense

  counter clockwise from the front plate

  tale 54 to the reflecting surface of the mirror 224.

  The mirror 224 is especially reflective for the red light, as that emitted by the fluorescent substance of the quadrant 56. The set of optical combinations 220 may also include a mirror 225 aligned with the quadrant 58 and a reflective surface made with the front plate. 54 an acute angle, for example 45, measured counterclockwise from the front plate 54 to the reflecting surface of the moiroir 225. The mirror 225 is especially reflectivefor the

  blue light, such as that emitted by the fluorescent substance

quadrant 58.

  The use of separate mirrors 224 and 225 in

  the set of optical combinations 220 may be advantageous

  when independent angular adjustment of the mirrors with respect to the front plate 54 is necessary. But if the set of optical combinations 220 is made so that the two mirrors 224 and 225 make the same acute angle with the front plate 54, the separate mirrors 224 and 225, as shown in the embodiment 220a in Figs. 4 to 6, can be replaced by a single mirror 222

  making the specified acute angle with the faceplate 54.

  Mirror 222 has halves 224a and 225a that are aligned with quadrants 56 and 58 and function in the same manner as separate mirrors 224 and 225.

  therefore, half 224a of mirror 222 preferably reflects light

  red re emitted by frame 176 and half 225a mirror 222 reflects

  especially the blue light emitted by the frame 178.

  The set of optical combinations 220 may comprise a filament

  dichroic 228 which is coplanar with the plane 53 between the quadrants 56 and 57, and oriented perpendicularly to the front plate 54. The filter

  dichroic 228 preferably transmits red light and reflects

  the green light. The set of optical combinations 220 comprise

  Also a filter 229 disposed in the plane 53 between the quadrants 58 and 59 and oriented perpendicularly to the front plate 54. The dichroic filter 229 preferably transmits the short wavelength blue light and preferably reflects the blue light of large size. wave length. Alternatively, as shown in the set of optical combinations 220a of Figs; 4 to 6, the separate dichroic filters 228 and 229 respectively can be replaced by a single filter 226. The filter 226 is disposed substantially coplanar with the plane 53 and is oriented perpendicularly to the front plate 54. The filter 226 consists of halves 228a and 229a which function similarly to separate filters 228 and 229, respectively. Therefore the half 228a of the filter essentially transmits the red light and reflects

  basically the green light. In addition, the half 229a of the filter trans-

  basically sets the blue light of short wavelength and reflects

  preferably shine blue light of long wavelength.

  The set of optical combinations 220 may also comprise

  ter a beam splitter 232 aligned with the quadrant 57 of the screen and disposed with respect to the frame 177 at an acute angle, for example e, opposite to the angular disposition of the mirror 224 and measured in the clockwise direction of a shows from the front plate 54. The beam splitter 232 which preferably transmits the red light, has a transmission power of about 50% and a reflection power of

  % for green light, such as that emitted by the fluorescent substance

  The optical combiner assembly 220 may also include a beam splitter 233 aligned with the quadrant 59 of the screen 60 and at an appropriate angle, e.g. 45- opposite to the angular disposition of the mirror 225 and measured clockwise

  of a watch from the front plate 54. The separator of

  233 has a transmission power of about 50% and a reflectance of about 50% for the long wavelength blue light as that emitted by the fluorescent substance of quadrant 59, and preferably better transmitting light. blue short wave

  same as that emitted by the fluorescent substance of quadrant 58.

  Alternatively, and as shown by the set of optical combinations 220a of Figs. 4 to 6, the beam splitters 232 and 233 may be replaced by a single beam splitter 230 aligned with the quadrants 57 and 59, and disposed at the appropriate angle, such as for example, opposite to the angular disposition of the mirror 222 and measured in a clockwise direction

  from the front plate 54. The separator 230 is con-

  staged by respective halves 232a and 233a which are

  generated with quadrant 57 and quadrant 59 and operates similarly to mirrors 232 and 233. Therefore,

  the separator half 232a preferably transmits the light

  red and it has a transmission power of about 50% and a reflection power of 50% for green light. In addition, the beam splitter half 233a preferably transmits the short wavelength blue light and it

  has a transmission power of about 50% and a power

  50% bending for long wave blue light.

  The set of optical combinations 220 can also

  there is also a recovery mirror 238 aligned with the beam splitter 232 and disposed on its far side,

  parallel to the front plate 54. The mirror recovers

  tion 238 preferably reflects green light like

  from the fluorescent substance of quadrant 57 and trans-

  In addition, the set of optical combinations 220 may comprise a recovery mirror 239 aligned with the beam splitter 233 and disposed on its remote side, parallel to the front plate 54. The recovery mirror 239 preferably reflects blue light, such as that emitted by the fluorescent substance of quadrant 59 and 2s62744

  transmitted by beam splitter 233.

  Alternatively, according to the set of combinations

  optics 220a of Figs. 4 to 6, the recovery mirrors

  238 and 239 may be replaced by a single recovery mirror 236 aligned with the respective halves 232a and 233a of the single beam splitter 230, and disposed on its far side parallel to the front plate 54. The beam splitter 236 is constituted by halves 238a and 239a which are aligned with beam splitter halves 232a and 233a and which

  works in the same way as mirrors

  238 and 239. Therefore, the half 238a of the recovery mirror reflects the light

  green and its half reflects the blue light.

  Thus, in the set of optical combinations 220, the set of optical elements comprising the mirror 224, the filter 228 and the beam splitter 232 form a tent-like subassembly which is mounted on the front plate 54 that filter 228 constitutes

  an extension of plane 53 between quadrants 56 and 57.

  In addition, mirror 224 and beam splitter 232 aligned with quadrants 56 and 57 are oriented from

  to form with the filter 228 acute angles oppo-

  which are complementary to the angles formed by the mirror 224 and the beam splitter 232 with the faceplate 54. Also, the group of optical elements including the mirror 225, the filter 229 and the beam splitter 233 form a subassembly. tent shape which is mounted on the front plate 54 so that the filter 229 is an extension of the portion of the plane 53 between the quadrants 58 and 59. In addition, the mirror 225 and the beam splitter 223 aligned with the quadrants 58 and 59 are oriented to form with the filter 229 opposite acute angles which are complementary to the angles formed by the mirror 225 and the beam splitter 233

with the front plate 54.

  From an edge of the front plate 54

  find a similar subset in the form of a tent

  taking a mirror 240, a filter 241 and a second mirror 242. The mirror 240 is arranged in alignment with the tent-like subassembly comprising the mirror 224, the filter 228 and the beam splitter 232 and is oriented under a mirror. acute angle to the filter 241 which

  is an extension of Plan 55. In a similar way,

  2, the second mirror 242 is arranged in alignment with the tent-like subassembly comprising the mirror 225, the filter 229 and the beam splitter 233 and, compared to the mirror 240, it is oriented at an acute angle with respect to the filter 241. The opposite acute angles formed by the mirrors 240 and 242 with the filter 241 may be complementary to the angles formed by the mirrors 240 and 242 with the adjacent edge of the faceplate 54. The mirror 240 instead reflects the light

  red, green light and inter

  mediates of the visible light spectrum. The filter 241 which preferably transmits the red light, the green light

  and the intermediate color lights reflect more

  early blue light. The mirror 242, which instead transmits the red light, the green light and the intermediate color lights, has a transmission power of about 50% and a reflection power of about 50% for the blue light. As shown by the set of optical combinations 220a of Figs. 4 to 6, the single mirror 222, the unique filter

  226 and the single beam splitter 230 also form

  a tent-like subassembly mounted on the plate

  front end 54 so that the filter 226 forms an extension

  The mirror half 224a and the beam splitter half 232a aligned with the quadrants 56 and 57 are oriented to form with the filter half 228a opposite acute angles that are complementary to the mirror half angles. 224a and the

  half of separator 232a with front plate 54.

  Also, the mirror half 225a and the half of the mirror

  Beamer 233a form with the filter half 229a opposite sharp angles which are complementary to the angles formed by the mirror half 225a and the

  half of separator 233a with front plate 54.

  As already described, from an edge of the front plate 54 is the tent-like subassembly comprising a first mirror 240, a filter 241 and a beam splitter 242. The mirror 240 is disposed in aligning with the tent-like subassembly optical elements comprising mirror half 224a, filter half 228a and separator half 232a. In a similar way, the separator of

  beam 242 is disposed in alignment with the

  tent-like assembly of optical elements comprising

  half mirror 225a, half filter 229a and half separator 233a. In addition, the mirror 240 and the beam splitter 242 make with the filter 241 sharp opposite angles which can be complementary to the

  angles formed by the mirror 240 and the splitter

  242 with the adjacent edge of the front plate 54. Therefore, in the variant shown in Figs. 4 to 6, mirror 240 and beam splitter 242 and filter 241 are arranged to operate in a manner similar to that of the embodiment of FIG.

Fig. 2.

  In operation, the red light emitted by the frame 176 of the quadrant 56, represented by the red light beam 250 in FIG. 4, is reflected by the mirror half 224a in the direction of the filter half 228a. Therefore, the red light beam 250 is transmitted by the filter half 228a and by the

  separator half 232a to meet the mirror 240.

  As a result, the red light beam 250 is reflected by the mirror 240 in the direction of the axis

  optical 245 to pass through the filter 241 and the separators

  As a result, the red light beam 250 passes through an exit plane indicated at 246 of the set of optical combinations 220a to the observer's eye 247 positioned on the optical axis 245 or

in the vicinity of it.

  Thus, the red light coming from the weft

  176, represented by the radius 250, is propagated in the

  Apparently there are optical combinations 220 from frame 176 to output plane 246 along an optical path equivalent to four times a unit length "d" which can be defined as the center-to-center distance of neighboring quadrants 56 to 59 Therefore, the observer's eye 247 sees a virtual image of the red frame 176 in a plane designated 248 located at an equivalent optical distance of four times "d" from the output plane 246 of the assembly 220. It should also be noted that because of reflections of red light from frame 176 to mirror half 224a and mirror 240, the observer's eye 247 sees the image of frame 176 at the plane.

  248 as vertical and arranged in the left-hand orientation

  conventional right, such as the one suitable for reading

the page of a book.

  The green light emitted by the frame 177 of the

  57, represented by the green light radius 252 on

  FIG. 5, is reflected by about 50% and transmitted from

  50% by half beam splitter 232a.

  Therefore, the reflected portion of the green light beam 252 is reflected by the filter half 228a to

  half beam splitter 232a in which envi-

  About 50% of light is reflected to the frame 177 and about 50% is transmitted by the separator half 232a in the direction of the mirror 240. Also, the portion of green light initially transmitted by the beam splitter half 232a is reflected by half

  recovery mirror 238a to half of separation

  Beam driver 232a in which about 50% is transmitted in the direction of the frame 177 and 50% is reflected in the direction of the mirror 240. Therefore, the green light that encounters the mirror 240, as illustrated by the light beam green 252, is reflected by the mirror 240 in the direction of the optical axis 245 to

  go through the filter 241 and the beam splitter 242.

  As a result, the green light transmitted by the sepa-

  beam driver 242 passes through output plane 246

to the observer's eye 247.

  So, the green light that reaches the eye of

  the observer 247 propagates in the set of combinations

  Optical sounds 220a from the frame 177 to the output plane 246 along a total optical path equivalent to four times the unit length "d". Therefore, the eye of the operator 247 sees a virtual image of the green frame 177 on the plane 248 located at an equivalent optical distance of four times "d" from the exit plane 246. It should also be noted that because reflections of the green light by the beam splitter half 232a and the mirror 240, the observer's eye 247 sees the image of the frame 177 at the plane 248 as vertical and oriented from left to right as the image from the frame 176 to the plane 248. Therefore, the images of the frames 176 and 177 on the plane 248 appear superimposed on the eye of

  the observer 247 as superimposed on each other.

  On the other hand, the blue light emitted by the frame 178 of the quadrant 58, represented by the blue light ray 253 in FIG. 6 for example is reflected by the mirror half 225a in the direction of the filter half 229a. Therefore, the blue light ray 253 is transmitted through the filter half 229a and the separator half 233a to meet the beam splitter 242. As a result, about 50% of the radius

  of blue light is transmitted by the separator of

  242 and is lost for the system. About 50% of the blue light ray 253 is reflected by the beam splitter 242 in the direction of the optical axis 245 and to the filter 241. Therefore, the portion of the beam radius

  blue light 253 incident on the filter 241 is reflected

  shifts to beam splitter 242 in which about 50% is reflected in the direction of half

  beam splitter 233a and about 50% is trans-

  put by the beam splitter 242 and the exit plan

  246 to the eye of the observer 247.

  Thus, the part of the blue light ray 253

  from the frame 177 and which reaches the eye of the ob-

  Servo 247 propagates through the set of optical combinations 220a from the frame 177 to the output plane 246 over an optical path of total length equivalent to four times the unit length "d". Consequently, the observer's eye 247 sees a virtual image of the blue frame 178 at the plane 248 situated at an optical distance equivalent to four times "d" of the exit plane 246. It also appears that because of the reflections on the mirrors 225a and 242, the eye of the observer 247 sees

  the image of the frame 178 in the plane 248 in the vertical position

  This results in the image of the frame 178 in the plane 248 appearing in the eye of the observer 247 superimposed on the images of the same orientation of the images, and is oriented in the same way as the images of the frames 176 and 177.

frames 176 and 177.

  In addition, the blue light emitted by the frame 179 of the quadrant 59, illustrated by the ray of light

  blue 254 of FIG. 7 for example, is reflected in

  50% and transmitted to about 50% by the half beam splitter 233a. Therefore, the reflected portion of the blue light beam 254 is reflected by the filter half 229a to the beam splitter half 233a in which about 50% is reflected to the frame 179 and 50% is transmitted by the half of

  beam splitter 233a in the direction of the separator

  242. Also, the transmitted portion of the blue light beam 254 is reflected by the recovery mirror half 239a to the separator half 233a in which about 50% is transmitted by the beam splitter half 232a to the frame 179 and 50% is reflected by the beam splitter half 233a in the direction of the splitter 242. Therefore, with respect to the portions of the blue light beam 254 reaching the beam splitter 242, about 50% is

  transmitted by the separator 242 and is lost to the system

  while the portion of the blue light beam 254 meeting the filter 241 is reflected back to the beam splitter 242 in which about 50% is reflected in the direction of the optical axis 246 to the filter 241. half of separator

  beam level 233a and about 50% is transmitted by the sepa-

beam generator 242.

  Thus, the portion of the blue light ray 254 transmitted by the beam splitter 242 and the exit plane 246 to the observer's eye propagates through the set of optical combinations 220 from the frame 179 to the plane of the beam. output 246 on a total optical path

  equivalent to four times the unit length "d". By con-

  Sequentially, the eye of the operator 247 sees the image of the frame 179 at the plane 248, situated at an optical distance equivalent to four times "d" of the exit plane 246. Also, because of the reflections at half of beam splitter

  233a and the beam splitter 242, the eye of the observer

  Fig. 247 sees the image of the frame 179 in the plane 248 in a vertical position and with the same left-to-right orientation as the images of the frames 176, 177 and 178. Thus, and as shown in FIG. 8, the observer's eye 247 sees a single color image 260 which consists of a composite of the superimposed images of the frames 176, 177, 178 and 179. The single image 260 contains the entire red part comprising a red character R 262 which corresponds to the whole of the red character R 204 of the frame 176 of FIG. 3. Also, the single image 260 contains the entire green part constituting a character G towards 264 which corresponds to the whole of the green character G 208 in the frame 177 of FIG. 3. In addition, the image

  260 contains all the blue part constituting a characteristic

  B blue tare 266 which corresponds to the combination of short wavelength and long wavelength blue light 212 and 216 in frames 178 and 179 of FIG. 3. In addition, the single image 260 contains a yellow Y character 268, a purple P character 270 and a white W character 272. The yellow Y character 268 in the image 260 corresponds to the combination and mixing of the character 205 of red component in frame 176 and green component character 209 in frame 177 of FIG. 3. Also, the purple character 270 in the image 260 corresponds to the combination and mixing of the red component character 207 in the frame 176, the blue component character 213 in the frame 178 and the character

  217 of blue component in the frame 179 of FIG. 3.

  Similarly, the white W character 272 in the image 260 corresponds to the combination of the white component characters 206, 210, 214 and 218 in the frames 176,

177, 178 and 179 of FIG. 3.

  As shown in FIG. 2, the mirror 224, the filter 228 and the beam splitter 232 operate in the same manner as the mirror half 224a, the filter half 228a and the separator half 232a. Thus, the red light beam 250 emitted by the frame 176 is reflected by the mirror 224 to pass through the filter 228 and the beam splitter 232 in order to meet the mirror 240. Also, the green light beam 252 emitted

  the frame 177 is partially reflected by the separator

  beam portion 232 in the direction of the filter 228 and is partially transmitted by the splitter 232 in the direction of the recovery mirror 238. The portion of the green light beam 252 meeting the filter 228 is reflected to the beam splitter 232 in which it is partially reflected in the direction of the frame 177 and partially transmitted by the beam splitter 232 in the direction of the mirror 240. The portion of the green light beam 252 meeting the recovery mirror 238 is reflected back to the beam splitter 232 for be partially transmitted in the direction of the frame 177 and be partially reflected

in the direction of the mirror 240.

  As a result, the portions of the red light beam 250 and the green light beam 252 meeting the mirror 250 are reflected in the direction of the optical axis 245 to pass through the filter 241 and the beam splitter 242. Therefore, the parts of the radius of

  red light 250 and the green light beam 252 trans-

  placed by the beam splitter 242 pass through the exit plane 246 to the eye of the observer 247 disposed on the optical axis 245 or in the vicinity. Therefore, these parts of the red light ray 250 and the radius of

  green light 252 propagate throughout the set of

  Optical outputs 220 from the frames 176 and 177 to the output plane 246 on a total optical path equivalent to four times the unit length "d". Therefore, the observer's eye 247 sees virtual images of the red frame 176 and the green frame 177 in the plane 248 located at an optical distance equivalent to four times "d" along the optical axis 245. from the exit plane 246. In addition, because of the aforementioned reflections of the red light and the green light, the observer's eye 247 sees the respective virtual images

  of the red frame 176 and the green frame 177 in position

  vertical orientation and arranged in conventional

  from left to right so as to appear superbly

  posed and forming a single combined image.

  Also, as shown in FIG. 2, the mirror

  225, the filter 229 and the beam splitter 233 function.

  in the same way as the mirror half 225a,

  filter half 229a and separator half 233a.

  Thus, the blue light beam 253 emitted by the blue frame 178 is reflected by the mirror 225 to pass through the filter 229 and the beam splitter 233, thus meeting the beam splitter 242. Also, the beam

  blue light 254 emitted by the blue frame 179 is par-

  actually reflected by the beam splitter 233 in the direction of the filter 229 and is partially transmitted

  by the separator 233 in the direction of the reflection mirror

  239. The portion of the blue light ray 254 meeting the filter 229 is reflected to the beam splitter 233 in which it is partially reflected.

  in the direction of the frame 179 and partially trans-

  in the direction of the beam splitter 242. The portion of the blue light beam 254 meeting the recovery mirror 239 is reflected to the beam splitter 233 in which it is partially transmitted in the direction of the frame 179 and partially reflected

  in the direction of the beam splitter 242.

  As a result, some parts of

  253 and 254 blue light encountering the beam splitter

  242 are transmitted and lost to the system. other

  parts of the blue light rays 253 and 254 are

  by the separator 242 to the filter 241 in which they are reflected to the beam splitter 242. Parts of these blue light rays

  reflected back to beam splitter 242 are reflected

  in the direction of the beam splitter 233 and other portions of these blue rays reflected by the filter 241 pass through the beam splitter 242.

  therefore, the parts of the blue 253 and 254 trans-

  put by the separator 242 pass through the exit plane 246 to the eye of the observer 247. Thus, these portions of the blue light rays 253 and 254 propagate through the set of optical combinations 220 from the frames 178 and 179 until 'to the exit plan 246 on a trip

  total optical equivalent to four times the uniform length

  hide "d". Therefore, the observer's eye 247 sees respective virtual images of the blue frames

  178 and 179 in plan 248, at a balanced optical distance

  four times "d" along the optical axis 245, from the exit plane 246. In addition, because of

  described reflections of the blue light, the eye of the observer

  vateur sees virtual images of the blue vertical 178 and 179 frames arranged in the usual orientation from left to right, like the virtual images of the frames

178 and 179.

  Therefore, with the set of combinations

  220 shown in FIG. 2, the eye of the observer

  Vateur 247 sees the four virtual images of the frames 176 to 179 in the plane 248, with the same orientation and superimposed. As a result, the observer's eye 247 sees in the plane 248 a single multi-color image, such as the image 260 shown in FIG. 8. Thus, the

  the only combined image 260 produced by the set of combinations

  Optical Figures 220 shown in FIG. 2 also includes an all-red portion R 262, an all-green portion G 264 and a completely blue portion B 266. The red R portion 262 of image 260 corresponds to the entire red portion R 204 of frame 176 and

  the green part G 264 of the image 260 corresponds to the

  appears from the green part G of the frame. In addition, the blue part B 266 of the image 260 corresponds to the part

  B completely blue 212 and 2-16 frames 178 and 179.

  In addition, the combined single image 260 produced by the set of optical combinations 220 of FIG. 2 also includes a yellow Y portion 268, a purple P portion 270 and a white W portion 272. The yellow Y portion 268 of the image 260 corresponds to the combination and mixing of the red component 205 of the frame 176 and the green component 209 of the frame 177. The purple portion P 270 of the image 260 corresponds to the combination and to the mixing of the red component 207 of the frame 176 and of

  the blue component 213 and 217 of frames 178 and 179.

  Also, white portion 272 of image 260 corresponds to

  to the combination and mixing of the red component 206 of the frame 176, the green component 210 of the frame 177 and the blue component 217 and 218 of the frames

178 and 179.

  Fig. 11 shows another embodiment 220b whose structure is similar to that of the variant 220a of FIGS. 4 and 6 and which further comprises a mirror 274 blue light recovery. The mirror 274 is

  disposed beyond the beam splitter 242 and parallel-

  to the optical axis 245 for receiving the portions of the blue light rays 253 and 254 that are transmitted by the beam splitter 242 as shown in FIGS. 6 and 7. Those portions of the blue light rays 253 and 254 transmitted by the beam splitter 242 and which are described as lost for the system together with the set of optical combinations 220a are substantially entirely reflected by the recovery mirror 274 to the beam splitter 242. Therefore, at the beam splitter 242, the blue light reflected by the recovery mirror 274 is partially transmitted by the beam splitter 242 to the splitter half 233a and partially reflected by the splitter 242 in the direction of the optical axis 245. As a result, this part of blue light reflected in the direction of the optical axis 245 passes through the plane

  output 246 to the observer's eye 247.

  Thus, the blue light reflected by the mirror 274 and the beam splitter 242 to the eye 247 propagates from the respective frames 178 and 179 to the output plane 246 over an equivalent total optical path

  at four times the unit length "d". The eye of the observer

  247 therefore sees virtual images of the blue frames 178 and 179 produced by this blue light in the plane 248 located at an optical distance equivalent to four times "d" along the optical axis 245 from the exit plane 246. In FIG. furthermore, because of reflections of blue light from mirror 274 and beam splitter 242, as described, the associated virtual images of frames 178 and 179 seen in plane 248 are oriented in the same manner as images virtual signals produced by the blue light reflected by the beam splitter 242 and the filter 241. As a result, the virtual images of the frames 178 and 179 produced by the blue light reflected by the mirror 274 and the beam splitter 242 appear superimposed, which improves the virtual images produced by the blue light reflected by the beam splitter 242 and the filter 241. Therefore, by using the combination set 220b shown in FIG. 11, the observer's eye 247 can see a single color image

  as the image 260 shown in FIG. 8.

  A display device has thus been described above comprising a device that produces a group

2562? 44

  three or more component images of a subject, each

  any of these images being arranged symmetrically from a central part of the group and being inverted under

  at least one aspect compared to the other composite images

  group. The described display device also includes a paired device with the group to combine the three or more component images by producing a single combined image of the subject. Thus, if the three or more component images have different colors, the only resulting combined image

  is a color image of the subject.

  Although the viewing tube 22 of the cactoid-ray type described above has a plate

  rectangular outlet, it is also possible to

  use a circular exit faceplate or any other desired configuration. In addition, although the front plate 54 shown is planar, it is also possible that it has a symmetrical curvature with respect to the four quadrants,

  in which case the composite virtual image presents a

  identical bure. Furthermore, although the deflection assembly shown is of the raster scan type, it can

  also be a leg-type type that includes

  a device that produces the desired alphanumeric character contours, vectors and other shapes at any desired location on each of the quadrants 56 to 59 without having to scan the entire quadrant. Switches 142 to 145 and 186 to 189 of the composite frame generator circuit shown in FIG. 9 are described as being of the mechanical control type, such as relay switches for example, they can also be of the type to

  electronic control, such as semiconductor switches

  DF201 released by Analog Devices of Norwood, Massa-

  chussetts. The mirrors and beam splitters of optical combination assemblies 220, 220a and 220b have

2562? 44

  have been described as being of the plate type, but alternatively, each of the mirrors and separators of

  beam may consist of a surface with a coating

  appropriately or in a straight prism. Furthermore, the optical devices of the respective sets of optical combinations 220, 220a and 220b can be held in position relative to one another and with respect to the output front plate 54 by filling the intermediate space with index matching and

  optically transparent, like an epoxy resin used

  to bond plates against the implosion on the end faces of the viewing tubes, for

  form a rigid set. In addition, each of the separa-

  Beam beams of the respective sets of optical combinations 220, 220a and 220b may be of the improved plate-shaped type as described in United States Patent Application No. 513,939 filed in the name of the Applicant. Furthermore, the quadrants 56, 57, 58 and 59 are not necessarily made with the respective fluorescent substances specified to produce the

  associated colors, but they may be

  with other fluorescent substances to produce light of the same or a different color

  desired. Moreover, the device 20 described can function

  practically as explained, although with a lower efficiency, if the fluorescent screen 60 is constituted by an intimate and uniform mixture of fluorescent substances which emit the four colored lights described and if each of the mirrors and separators of

  beam is more appropriately

  chir and / or transmit the light of the particular color

wanted.

  In addition, the sets of optical combinations 220, 220a and 220b can operate in the manner described if the single viewing tube 22 is replaced by four viewing tubes whose output screens are made of respective materials which emit light from the light. 'a distinct color and which are arranged in the same plane in close juxtaposition. With four separate tubes, each having its own deflection device, the fluorescent screens can be addressed simultaneously by respective electron beams, in the well-known manner of the light spot scanning.

  colored mobile phones used in the broadcasting industry.

  television. In addition, the visualization device

  described can work satisfactorily if another imaging device, such as an array of light emitting diodes addressed in a matrix by

  This example replaced the viewing tube 22 of FIG. 1.

  It is understood that many changes

  can be made to the embodiments which have been described and illustrated by way of example, in no way

  without departing from the framework and spirit of the invention.

tion.

Claims (20)

  1. Composite visual display device,   characterized in that it comprises a device (22) which produces a group of at least three images, each of which is inverted   in at least one aspect compared to the others, and a   positive (220) combination of said images. 2. Device according to claim 1, characterized in that said images are disposed in a common surface (62) and grouped around a portion (61) of the surface. 3. Device according to claim 2, characterized in that said surface is constituted by quadrants   (56, 57, 58, 59) with respectively respective angles   contiguous to said part of the surface, said images being arranged in respective quadrants of the surface.   4. Device according to claim 3, characterized in that one of said images comprises a first and a second adjacent sides arranged in contiguity with respect to each other. other pictures of the group.   5. Device according to claim 1, characterized   in that said images consist of composite images respective health of a subject.   6. Device according to claim 5, characterized in that said component images have colors. respectively.   7. A display device, characterized in that it comprises a device (22) which produces a group of at least three component images of a subject, each of said images being inverted in at least one aspect relative to the others, and a device (220) coupled with   said image producing device for combining the   said images and forming a composite image of said subject.   8. Device according to claim 7, characterized in that said image production device comprises a device (56, 57, 58, 59) which produces each   said images in a respective color.   9. Device according to claim 7,   characterized in that said image producing device (22) comprises a device which produces said component images in a common surface (62), said images being arranged in respective quadrants (56, 57, 58, 59) of the surface.   10. Device according to claim 9, characterized   in that a first of said images in a first des-   said quadrants is oriented in the conventional manner   from left to right and from top to bottom, that a second des-   said images in a second one of said quadrants is oriented opposite to said left-to-right orientation of said first one of the images and a third of said images in a third of said quadrants is oriented opposite said top-down orientation of said first images.   11. Device according to claim 10, characterized in that the first of the images and the second of the images comprise similar parts of the same subject arranged   in mirror images of each other.   Device according to claim 10, characterized   in that the first of said images and the third of   said images comprise similar parts of said subject arranged as replicas vertically inverted one the other.   13. Device according to claim 10, characterized in that a fourth of said images in a fourth of said quadrants is oriented opposite to the orientation from left to right and the orientation from top to bottom of said first of said images.   Device according to claim 13, characterized   in that the second of said images and the fourth of   said images comprise similar parts of said subject arranged as replicas vertically inverted one the other.   15. Device according to claim 13, characterized   in that the third of said images and the   third of said images comprise similar parts of said subject arranged in mirror images of each other 16. A display device, characterized in that   it includes an image forming screen (62) comprising   a fluorescent layer with quadrants (56, 57, 58, 59) of which at least three are made of respective fluorescent substances which emit light from   different colors, a production device   an image forming screen (80) coupled to said image forming screen for exciting transmission of said   different colors by said three quadrants and produce   these three quadrants of the respective color component images of a subject, each of said component images being inverted in at least one aspect by   compared to the other images and a device (220) for combi-   picture frame coupled with said training screen   images for combining said component images into   theirs and to form a single image in multiple colors.   The device of claim 16, characterized in that said image forming screen (62) comprises said fluorescent layer with a fourth quadrant (59) made of a fluorescent material similar to the fluorescent material of any one of three other quadrants   to emit an improved color light.   Device according to claim 16, characterized in that said image generating device comprises a quadrant addressing device (80) for addressing each of the three quadrants in an inverse manner under at least   an aspect in relation to the addressing of some other quadrants.   The device of claim 16, characterized in that said image combining device (220) comprises an optical device which directs said lights of different colors emitted by said three quadrants along equivalent optical paths to   an output of said image combining device.   Device according to claim 19, characterized   in that said optical device comprises devices   light direction beams (224, 228, 232, 238) project light beams emitted from said three quadrants to said output of the image combining device, as emanating from a single virtual image in a surface located from said exit at a distance   substantially equal to said equivalent optical paths slow.