WO2006073792A1 - Ecran cathodique a balayage vertical multistandard - Google Patents

Ecran cathodique a balayage vertical multistandard Download PDF

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Publication number
WO2006073792A1
WO2006073792A1 PCT/US2005/046047 US2005046047W WO2006073792A1 WO 2006073792 A1 WO2006073792 A1 WO 2006073792A1 US 2005046047 W US2005046047 W US 2005046047W WO 2006073792 A1 WO2006073792 A1 WO 2006073792A1
Authority
WO
WIPO (PCT)
Prior art keywords
video signal
cathode ray
ray tube
incoming video
rate
Prior art date
Application number
PCT/US2005/046047
Other languages
English (en)
Inventor
Richard Hugh Miller
Max Artigalas
Original Assignee
Thomson Licensing
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomson Licensing filed Critical Thomson Licensing
Publication of WO2006073792A1 publication Critical patent/WO2006073792A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/27—Circuits special to multi-standard receivers

Definitions

  • the invention is related to a cathode ray tube (CRT) for a high definition television display operating in a vertical scan mode.
  • CTR cathode ray tube
  • HDTV high definition television
  • HDTV high definition television
  • HDTV high definition television
  • HDTV high definition television
  • CRT wide deflection angle CRT display
  • FIG. 1 shows the basic geometrical relationship between throw and deflection angle in a typical CRT. Increasing the deflection angle A is favorable since it reduces throw and allows for production of a shorter CRT and ultimately a slimmer television set. Because the general display market trend has been moving toward flatter displays which are thin, the CRT designers are being challenged to develop shorter CRTs. This means that for a CRT having only one electron gun assembly, the deflection angle must be increased to diminish depth. As the deflection angle increases, throw decreases and spot size decreases in a non-linear relationship. The relationship between spot size and throw can be approximated mathematically as follows:
  • Obliquity is the effect of a beam intercepting a screen at an oblique angle causing elongation of the spot in the radial direction.
  • a spot which is generally circular in shape at the center of the screen becomes radially oblong or elongated as it moves toward edges of the screen.
  • the spot is most elongated at the edges of the major axis and in the corners.
  • spot shape is further compromised by yoke deflection effects in self converging CRTs having horizontal gun orientation.
  • the horizontal yoke field having a pincushion shaped field is provided while the vertical yoke field is barrel shaped field.
  • These yoke fields cause the spot shape to be elongated. This elongation adds to obliquity effects further increasing spot distortion at the 3/9 and corner positions on the screen.
  • U.S. Patent No. 5, 170,102 describes a CRT with a vertical electron gun orientation such that the plane in which the undeflected beams are located is parallel to the short axis of the display screen.
  • the deflection system is connected to a signal generator for scanning the display screen in a raster having a plurality of lines oriented along the short axis of the display screen.
  • the deflection system has a first set of coils for generating a substantially pincushion shaped deflection field for deflecting the beams in the direction of the short axis of the display screen and a second set of coils for generating a substantially barrel shaped deflection field for deflecting the beams in the direction in the long axis of the display screen.
  • This system's yoke deflection effects generally distort spots by elongating them vertically. This vertical elongation compensates for obliquity effects, thereby reducing spot distortion at the 3/9 and corner positions on the screen.
  • a cathode ray tube display having a fast vertical scan rate and slow horizontal scan rate.
  • the display comprises a cathode ray tube having an electron gun for generating electron beams, a deflection yoke near the cathode ray tube, and a chassis equipped with at least one integrated circuit capable of receiving more than one incoming video signal rates and converting the incoming video signal rates to a specific output video signal rate.
  • the at least one integrated circuit being capable directing signals to circuits that drive the deflection yoke and the electron gun to scan the electron beams at the specific output video signal rate.
  • the cathode ray tube display is capable of processing incoming video signal rates at 24 Hz to 100 Hz with fast vertical scan rate near 51.56 kHz, whereby the number of a fast vertical scan lines is inversely proportional to the incoming video signal rates.
  • FIGURE 1 is a diagram depicting the basic geometrical relationship between the throw distance and deflection angle in a typical CRT;
  • FIGURE 2 is a block diagram of a first illustrative embodiment of the invention.
  • FIGURE 3 is a block diagram of a detailed illustrative embodiment of the associated signal processing and electronic drive system for the CRT display according to the invention.
  • FIGURE 4 is another block diagram of a detailed illustrative embodiment of the associated signal processing and electronic drive system for the CRT display according to the invention.
  • a cathode ray tube display comprises vertically oriented inline guns, a deflection yoke, and a means of implementing the vertical high frequency scan system for compatibility with 50Hz signals and 60Hz video signals as well as film frame rates 24 Hz (in the U.S.) and 25 Hz (in Europe).
  • the high frequency scan rate is intended to cover a number of signal sources, such as from 24 Hz to 100 Hz, which include the cinema modes around 24 Hz and 25 Hz input and 72Hz to 75Hz output.
  • the system could be further enhanced to sense the incoming video signal rate and then automatically adapted to show the incoming signal at one of the possibilities for that signal. This selection process could be fully automatic or provide a selection to the consumer when more than one display option is possible.
  • the number of high frequency scan lines and hence the active horizontal pixel count can be changed to accommodate a variety of input signals.
  • Table 1 below shows several specific low frequency scan rate implementations for a typical high frequency scan frequency 51.56 kHz.
  • a typical output format for a vertical scan CRT is 128Oi x 720 at 60 Hz.
  • This invention increases the pixel count at 60 Hz from 1280 at 41.25 kHz high frequency scan rate to 1600 at 51.56 kHz as shown in Table 1.
  • Other plausible high frequency vertical scan rates are conceivable in the 40 kHz to 60 kHz range output rates.
  • the invention also provides for a variety of other signal formats.
  • the implementation of the invention uses a pre-scaler and a post-sealer as shown in Figure 2 to adjust the input pixel counts to the selected output format as shown in the Table 1.
  • FIG. 3 is a more detailed block diagram of an implementation of the invention showing incoming signal feeding into a front end processor 500.
  • the front-end processor 500 also generates horizontal and vertical progressive sync.
  • the pre-scaler 510 receives the output signals from the front-end processor and initiates the adjustment of the pixel count.
  • the post-sealer completes the adjustments of the input pixel format to the selected output.
  • a format converter 530 can perform YPbPr to RGB format conversion to enable a video correction element 540 to accomplish video correction which ensures optimized convergence and geometry throughout the visible screen and ensures proper positioning of the individual red, green and blue sub-images.
  • the element 540 can include an integrated circuit or field programmable gate array to implement a video correction element and also accomplish a conversion from progressive to interlaced vertical scanning.
  • the digital RGB(i) interlaced vertical scan signal output by the video correction element 540 undergoes a conversion by a digital-to-analog (D/ A) converter 550 yielding analog RGB(i) signals.
  • An image processor 560 accomplishes final generation of the interlaced vertical scan signal by providing contrast, brightness, AKB, and ABL functions.
  • a video amplifier element 570 drives the three electron guns of CRT 580 in accordance with the RGB(i) signals from the image processor 560.
  • a sync processor 590 provides sync signals to the dynamic focus generator 600, quad drive 610, and deflection signal generator 620 in accordance with the H&V(i) signals received by the sync processor from the video correction element 540.
  • the image quality of all implementations is influenced by the quality of the algorithm utilized to do the motion compensation.
  • full motion compensation algorithms or motion adaptive algorithms can be employed in any embodiment of the invention to reduce image jitter, which can be created or enhanced because of the signal processing according to the invention.
  • the basic (e.g. frame insertion) quality level could be enhanced by further processing block 515 as shown in Fig 4.
  • This implementation of a vertical scan system with a single high-frequency scan rate and multiple low frequency scan rates will permit one common basic chassis design to be utilized all over the world, adaptable to both 50Hz and 60Hz standards, hence simplifying the chassis design requirements of such a display system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)

Abstract

La présente invention a trait à un écran cathodique présentant une cadence de balayage vertical rapide et une cadence de balayage horizontal lente. L'écran comporte un tube cathodique comprenant un canon électronique pour la génération de faisceaux d'électrons, un bloc de déviation à proximité du tube cathodique, et un châssis équipé d'au moins un circuit intégré apte à la réception de plusieurs débits de signaux vidéo entrants et la conversion des débits de signaux vidéo entrants en un débit spécifique de signaux vidéo en sortie . Ledit au moins un circuit intégré étant apte à diriger le signal vers des circuits qui commandent le bloc de déviation et le canon électronique pour le balayage des faisceaux d'électrons au débit spécifique de signaux vidéo en sortie. L'écran cathodique est capable de traiter des taux de signaux vidéo entrants à 24 Hz en 100 Hz avec une cadence de balayage vertical rapide proche de 51,56 kHz, selon lequel le nombre de lignes de balayage vertical rapide est inversement proportionnel aux débits de signaux vidéo entrants.
PCT/US2005/046047 2004-12-31 2005-12-20 Ecran cathodique a balayage vertical multistandard WO2006073792A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64043704P 2004-12-31 2004-12-31
US60/640,437 2004-12-31

Publications (1)

Publication Number Publication Date
WO2006073792A1 true WO2006073792A1 (fr) 2006-07-13

Family

ID=36169173

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/046047 WO2006073792A1 (fr) 2004-12-31 2005-12-20 Ecran cathodique a balayage vertical multistandard

Country Status (1)

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WO (1) WO2006073792A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111861857A (zh) * 2020-07-06 2020-10-30 Oppo广东移动通信有限公司 一种显示模组、显示设备、图像显示方法及存储介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989092A (en) * 1988-12-07 1991-01-29 U.S. Philips Corporation Picture display device using scan direction transposition
EP0523792A2 (fr) * 1991-07-19 1993-01-20 Koninklijke Philips Electronics N.V. Dispositif multinormes de reproduction d'images
EP0803855A2 (fr) * 1996-04-23 1997-10-29 Hitachi, Ltd. Processeur pour convertir le nombre de pixels d'un signal vidéo et appareil d'affichage utilisant ce processeur
US5812210A (en) * 1994-02-01 1998-09-22 Hitachi, Ltd. Display apparatus
WO2003085950A2 (fr) * 2002-04-04 2003-10-16 Thomson Licensing S.A. Balayage bidirectionnel transpose dans un tube cathodique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989092A (en) * 1988-12-07 1991-01-29 U.S. Philips Corporation Picture display device using scan direction transposition
EP0523792A2 (fr) * 1991-07-19 1993-01-20 Koninklijke Philips Electronics N.V. Dispositif multinormes de reproduction d'images
US5812210A (en) * 1994-02-01 1998-09-22 Hitachi, Ltd. Display apparatus
EP0803855A2 (fr) * 1996-04-23 1997-10-29 Hitachi, Ltd. Processeur pour convertir le nombre de pixels d'un signal vidéo et appareil d'affichage utilisant ce processeur
WO2003085950A2 (fr) * 2002-04-04 2003-10-16 Thomson Licensing S.A. Balayage bidirectionnel transpose dans un tube cathodique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111861857A (zh) * 2020-07-06 2020-10-30 Oppo广东移动通信有限公司 一种显示模组、显示设备、图像显示方法及存储介质

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