EP0574084A1 - Flache Bildwiedergabeanordnung mit Elektronenfortpflanzungskanälen - Google Patents

Flache Bildwiedergabeanordnung mit Elektronenfortpflanzungskanälen Download PDF

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Publication number
EP0574084A1
EP0574084A1 EP93201608A EP93201608A EP0574084A1 EP 0574084 A1 EP0574084 A1 EP 0574084A1 EP 93201608 A EP93201608 A EP 93201608A EP 93201608 A EP93201608 A EP 93201608A EP 0574084 A1 EP0574084 A1 EP 0574084A1
Authority
EP
European Patent Office
Prior art keywords
selection
fine
electrodes
preselection
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93201608A
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English (en)
French (fr)
Other versions
EP0574084B1 (de
Inventor
Nicolaas Lambert
Gerardus Gregorius Petrus Van Gorkom
Petrus Hubertus Franciscus Trompenaars
Siebe Tjerk De Zwart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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Publication date
Application filed by Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP93201608A priority Critical patent/EP0574084B1/de
Publication of EP0574084A1 publication Critical patent/EP0574084A1/de
Application granted granted Critical
Publication of EP0574084B1 publication Critical patent/EP0574084B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/08—Electrodes intimately associated with a screen on or from which an image or pattern is formed, picked-up, converted or stored, e.g. backing-plates for storage tubes or collecting secondary electrons
    • H01J29/085—Anode plates, e.g. for screens of flat panel displays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/126—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using line sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2329/00—Electron emission display panels, e.g. field emission display panels
    • H01J2329/18—Luminescent screens
    • H01J2329/30—Shape or geometrical arrangement of the luminescent material

Definitions

  • the invention relates to a picture display device having a vacuum envelope which is provided with a transparent face plate with a display screen having a pattern of picture elements (pixels) luminescing in different colours, and with a rear plate, said display device comprising a plurality of juxtaposed electron propagation means extending substantially parallel to the face plate, and an addressing system, arranged between said means and the face plate, to selectively address desired pixels on the screen.
  • a picture display device having a vacuum envelope which is provided with a transparent face plate with a display screen having a pattern of picture elements (pixels) luminescing in different colours, and with a rear plate
  • said display device comprising a plurality of juxtaposed electron propagation means extending substantially parallel to the face plate, and an addressing system, arranged between said means and the face plate, to selectively address desired pixels on the screen.
  • the display device described above is of the flat-panel type, as disclosed in EP-A-464 937.
  • Display devices of the flat-panel type are devices having a transparent face plate and, arranged at a small distance therefrom, a rear plate, with the inner surface of the face plate being provided with a (hexagonal) pattern of phosphor dots. If (video information-controlled) electrons impinge upon the luminescent screen, a visual image is formed which is visible via the front side of the face plate.
  • the face plate may be flat or, if desired, curved (for example, spherical or cylindrical).
  • the display device described in EP-A-464 937 comprises a plurality of juxtaposed sources for emitting electrons, local electron-propagation means cooperating with the sources and each having walls of high-ohmic, electrically substantially insulating material having a secondary emission coefficient suitable for propagating emitted electrons, and an addressing system with electrodes (selection electrodes) which can be driven row by row for withdrawing electrons from the propagation means at predetermined extraction locations facing the luminescent screen, further means being provided for directing extracted electrons towards pixels of the luminescent screen for producing a picture composed of pixels.
  • the operation of the picture display device disclosed in EP-A-464 937 is based on the recognition that electron propagation is possible when electrons impinge on a wall of a high-ohmic, electrically substantially insulating material (for example, glass or synthetic material) if an electric field of sufficient power is generated over a given length of the wall (by applying a potential difference across the ends of the wall).
  • the impinging electrons then generate secondary electrons by wall interaction, which electrons are attracted to a further wall section and in their turn generate secondary electrons again by wall interaction, and so forth.
  • a flat-panel picture display device can be realised by providing each one of a plurality of juxtaposed "compartments", which constitute propagation ducts, with a column of extraction apertures at a side which is to face a display screen. It will then be practical to arrange the extraction apertures along "horizontal" lines extending transversely to the ducts.
  • an addressing means is provided with which electrons can be selectively withdrawn from the "compartments” and directed (and accelerated) towards the screen for producing a picture composed of pixels by activating the pixels.
  • the addressing system can be of the single-stage type, or of the multi-stage type.
  • EP-A-464 937 particularly describes a multi-stage addressing system.
  • a multi-stage addressing system using a number of preselection extraction locations, which number is reduced with respect to the number of pixels, and associated therewith a number of (fine-) selection apertures which corresponds to the number of pixels provides advantages with respect to the extraction efficiency and/or with respect to the required number of connections/drivers.
  • For controlling the preselection locations a pattern of preselection electrodes is used, and for controlling the (fine) selection apertures a pattern of fine-selection electrodes is used.
  • the pitch of the shadow mask is typically 2 to 3 times smaller than the spot size.
  • the resolution, i.e . definition of the display is then determined by the spot size, while the precise details of the colour dots within a shadow mask pitch are less important.
  • the pitch of the colour dot structure is of the same order as the resolution of the display. Since a too high resolution of the display is expensive, when using a given signal, it is important to choose the resolution of the display in the vicinity of the desired resolution. Hence, the details of colour dot structure are more important than in the traditional display tube.
  • the pixel arrangement is simple in itself and, in the case of a multi-stage addressing system, allows the use of a simple fine-selection electrode arrangement.
  • the pixels are arranged along paths extending transversely to the electron propagation means, the pixels of adjoining paths being staggered with respect to each other. (In a large number of applications this implies that the pixels are arranged in (horizontal) paths parallel to the long axis of the display screen.)
  • the invention is based on the following recognitions.
  • Each picture line is then written, for example across two horizontal R,C, B colour dot paths (which together form a row of adjoining dot triangles).
  • the drive scheme is such that consecutive (interlace) lines move up by only one colour dot (half a triangle) a time and thus overlap each other by half a line.
  • consecutive (interlace) lines move up by only one colour dot (half a triangle) a time and thus overlap each other by half a line.
  • such an overlap may cause (colour) artefacts at sharp, vertical contrast transitions which give rise to a colour flicker in the case of interlace.
  • overlap should be prevented, which is only possible if a screen with a larger number of (smaller) dots is used.
  • An embodiment of the display device is characterized in that the addressing system comprises a preselection structure having preselection locations which are connected by preselection (or coarse-selection) electrodes parallel to said paths, and a fine-selection structure having fine-selection apertures which are connected by fine-selection electrodes, each fine-selection aperture being associated with a pixel and the orientation of the fine-selection electrodes corresponding to the orientation of the preselection electrodes.
  • the electrode tracks which connect the fine selection apertures may have different orientations, for example "vertical” or "oblique” orientations.
  • the invention is based a.o. on the recognition that an optimal reduction of the number of groups of fine-selection electrodes is only possible if the electrode tracks which connect the fine selection apertures have the same orientation as the electrode tracks of the pre-selection selection structure.
  • a large reduction of the number of connections can be achieved by parallel interconnection of fine-selection tracks in groups.
  • the fine-selection electrode at each addressed coarse-selection aperture has a considerably higher potential at the desired colour than the other fine-selection electrodes associated with said coarse-selection aperture.
  • an apertured plate is arranged, in accordance with an embodiment of the invention, between the preselection structure and the selection plate, the aperture sizes and the distance to the selection plate being chosen in such a way that direct hits are substantially impossible (the plate being referred to as anti-direct hit plate).
  • Fig. 1 shows a flat-panel picture display device having a display panel (window) 3 and a rear wall 4 located opposite said panel.
  • Display screen 7 has a hexagonal pattern of red (R), green (G) and blue (B) luminescing phosphor elements arranged in triangles (traffic sign configurations) located on the inner surface of window 3.
  • R red
  • G green
  • B blue
  • luminescing phosphor elements arranged in triangles (traffic sign configurations) located on the inner surface of window 3.
  • the red, green and blue phosphor elements are arranged, in staggered relationship, in paths parallel to the long axis of the display screen (in other words, they are horizontally staggered, see inset).
  • An electron source arrangement 5 for example a line cathode which by means of electrodes provides a large number, for example 600, of electron emitters or a corresponding number of separate emitters, is arranged proximate to a wall 2 which interconnects panel 3 and rear wall 4. Each of these emitters is to provide a relatively small current so that many types of cathodes (cold or hot cathodes) are suitable as emitters.
  • the emitters may be driven by a video drive circuit.
  • the electron source arrangement 5 is arranged opposite entrance apertures of a row of electron propagation ducts extending substantially parallel to the screen, which ducts are constituted by compartments 6, 6', 6'', ... etc .; in this case one compartment for each electron source.
  • compartments have cavities 11, 11', 11'', ... defined by the rear wall 4 and partitions 12, 12', ....
  • the cavities 11, 11', ... may alternatively be provided in the rear wall 4 itself.
  • At least one wall (preferably the rear wall) of each compartment should have a high electrical resistance which is suitable for the purpose of the invention in at least the propagation direction (suitable materials are, for example ceramic material, glass, synthetic material - coated or uncoated -) and have a secondary emission coefficient ⁇ > 1 over a given range of primary electron energies.
  • An axial propagation field is generated in the compartments by applying a potential difference V p across the height of the compartments 6, 6', 6'', ....
  • the electrical resistance of the wall material has such a value that a minimum possible total amount of current (preferably less than, for example 10 mA) will flow in the wails in the case of a field strength in the axial direction in the compartments of the order of one hundred to several hundred volts per cm required for the electron propagation.
  • the invention utilizes the aspect disclosed in EP-A-400 750 and EP-A-436 997 that vacuum electron propagation within compartments having walls of high-ohmic electrically substantially insulating material is possible if an electric field of sufficient power is applied in the longitudinal direction of the compartment.
  • the contents of EP-A-400 750 and EP-A-436 997 are herein incorporated by reference.
  • Structure 100 is separated from the luminescent screen 7 by a flu-spacer structure 101, for example an apertured plate of electrically insulating material.
  • Fig. 2 shows in a diagrammatical cross-section a part of the display device of Fig. 1 in greater detail, particularly the active colour selection plate structure 100 which comprises a preselection plate 10a with apertures 8, 8', 8'', ... and a fine-selection plate 10b with groups of apertures R, G, B.
  • the apertures R, G, B are in-line.
  • they are arranged in a triangular configuration, see, for example Fig. 3.
  • An anti-direct hit plate 10b having apertures 108, 108'', ..., constituting, as it were, "chicanes" in the electron paths is arranged between the preselection plate 10a and the fine-selection plate 10c.
  • Electron propagation ducts 6 with propagation cavities 11, 11', ... are formed between the structure 100 and rear wall 4.
  • addressable metal preselection electrodes 9, 9', etc. extending from aperture to aperture and surrounding the apertures are arranged in ("horizontal") rows parallel to the long axis of the display screen on the plate 10a.
  • the walls of the apertures 8, 8', ... may be metallized to enhance the effect of the electrodes.
  • the fine-selection plate 10c is provided with "horizontally oriented" addressable rows of (fine-)selection electrodes for realising fine selection.
  • the possibility of directly or capacitively interconnecting corresponding rows of fine-selection electrodes is important in this respect. In fact, a preselection has already taken place and, in principle, electrons cannot land at the wrong location. This means that only one group, or a small number of groups of three separately formed fine-selection electrodes is required for this mode of fine selection.
  • the rows of preselection electrodes are subjected to a linearly increasing DC voltage by connecting them to voltage-dividing resistors 50 (see Fig. 12). These voltage-dividing resistors may be arranged at the rim of the preselection plate, in vacuo.
  • the voltage-dividing resistors are connected to a voltage source in such a way that the preselection electrodes receive the correct potential to realise electron propagation in the ducts.
  • the drive is effected from a drive circuit 51, for example by applying a pulse (of, for example 250 V) for a short time to consecutive preselection electrodes and by applying shorter lasting pulses of, for example 200 V to the desired fine-selection electrodes. It should of course be ensured that the line selection pulses are in synchronism with the video information.
  • the video information is presented, for example to the individual G1 electrodes driving the emitters (Fig. 1), for example in the form of a time or amplitude-modulated signal.
  • the plate 10b may be combined to one assembly at both sides by means of one or both spacer plates 102, 103.
  • Fig. 4 shows an embodiment of a pre-selection plate 10a in which two preselection apertures for each extraction location with a pitch of (p/2) are provided in each (horizontal) row of preselection electrodes.
  • Each preselection electrode 42 is divided into two apertured sub-electrodes 43a and 43b in the manner shown, which simplifies contacting. In this way the horizontal resolution can be doubled, while, for example the width of the propagation ducts, which are localized between walls 12 and 12', remains the same and without having to change the mode of operating the propagation ducts 6, 6', 6'', ... (each cooperating with one electron emitter).
  • a plurality of fine-selection apertures is associated with each preselection aperture (44, 44', ...), for example, in the manner shown in Fig. 1.
  • the system described can be operated in the "multiplex" mode. This means that, for example 2 x 3 pixels can be consecutively driven (multiplexed) in one line period by means of one electron emitter. Other multiplex schemes are alternatively possible.
  • a basic embodiment is, for example a track through the centre of each triangle with which one of the apertures is driven, while the remaining two apertures are driven by a superjacent and a subjacent track, respectively.
  • the central track may give rise to negative charge during switch-off, but since the access aperture in the anti-direct hit plate is located right opposite this track, this has no serious consequences for addressing the other two apertures.
  • Figs. 8 to 11 show various embodiments using horizontal R, G, B colour dot paths.
  • Figs. 8 and 10 show examples of suitable "horizontally orientated" track patterns.
  • Figs. 12 and 13 show embodiments in which the track patterns are not oriented "horizontally” but “obliquely”, using column arrangements of fine-selection triangles which are not staggered and which are staggered, respectively, with respect to each other.
  • the drive symmetry is less satisfactory than in the case of selection of the type 3:1 or 2:1.
  • the location of the selection electrode tracks is favourable because there are now tracks which charge negatively, which may be caused during switch-off. This is an impediment to the route towards the outer apertures in a structure with horizontal R, G, B colour dot paths, a small distance between the tracks is necessary for a horizontal track pattern.
  • a multi-stage selection structure has been described hereinbefore in relation to two stages. However, the multi-stage selection structure can also be used to advantage with more than two stages.
  • the length of the electron propagation ducts or the quantity of juxtaposed propagation ducts is unimportant for the picture quality. Any aspect ratio for a display screen having a short axis and a long axis is thus possible, for example, 4:3; 14:9; 16:9.
  • the electron propagation ducts are generally parallel to the short axis of the display screen, but in some cases it may be advantageous if they are parallel to the long axis.
  • horizontal(ly) is used in a large part of this description. This term is understood to mean parallel to the coarse-selection electrodes, but if the display is rotated a quarter turn, it will of course also work. There are of course also various trivial modifications of the patterns shown in the Figures, for example, patterns derived via mirroring etc.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP93201608A 1992-06-12 1993-06-04 Flache Bildwiedergabeanordnung mit Elektronenfortpflanzungskanälen Expired - Lifetime EP0574084B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93201608A EP0574084B1 (de) 1992-06-12 1993-06-04 Flache Bildwiedergabeanordnung mit Elektronenfortpflanzungskanälen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92201720 1992-06-12
EP92201720 1992-06-12
EP93201608A EP0574084B1 (de) 1992-06-12 1993-06-04 Flache Bildwiedergabeanordnung mit Elektronenfortpflanzungskanälen

Publications (2)

Publication Number Publication Date
EP0574084A1 true EP0574084A1 (de) 1993-12-15
EP0574084B1 EP0574084B1 (de) 1996-09-18

Family

ID=8210682

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EP93201608A Expired - Lifetime EP0574084B1 (de) 1992-06-12 1993-06-04 Flache Bildwiedergabeanordnung mit Elektronenfortpflanzungskanälen

Country Status (6)

Country Link
EP (1) EP0574084B1 (de)
JP (1) JPH08106868A (de)
CN (1) CN1080432A (de)
AT (1) ATE143174T1 (de)
DE (1) DE69304802T2 (de)
ES (1) ES2093355T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998032151A1 (en) * 1997-01-20 1998-07-23 Koninklijke Philips Electronics N.V. Display device, a connection element for use in said display device, and a strip provided with such connection elements
WO2002051213A1 (en) * 2000-12-20 2002-06-27 Koninklijke Philips Electronics N.V. Electroluminescent color display panel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369468A2 (de) * 1988-11-18 1990-05-23 Sanyo Electric Co., Ltd. Flache Anzeigevorrichtung
EP0464937A1 (de) * 1990-07-05 1992-01-08 Koninklijke Philips Electronics N.V. Flache Bildwiedergabevorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369468A2 (de) * 1988-11-18 1990-05-23 Sanyo Electric Co., Ltd. Flache Anzeigevorrichtung
EP0464937A1 (de) * 1990-07-05 1992-01-08 Koninklijke Philips Electronics N.V. Flache Bildwiedergabevorrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998032151A1 (en) * 1997-01-20 1998-07-23 Koninklijke Philips Electronics N.V. Display device, a connection element for use in said display device, and a strip provided with such connection elements
WO2002051213A1 (en) * 2000-12-20 2002-06-27 Koninklijke Philips Electronics N.V. Electroluminescent color display panel
CN1295945C (zh) * 2000-12-20 2007-01-17 皇家菲利浦电子有限公司 场致发光彩色显示屏

Also Published As

Publication number Publication date
EP0574084B1 (de) 1996-09-18
DE69304802T2 (de) 1997-03-20
JPH08106868A (ja) 1996-04-23
ES2093355T3 (es) 1996-12-16
CN1080432A (zh) 1994-01-05
DE69304802D1 (de) 1996-10-24
ATE143174T1 (de) 1996-10-15

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