WO2001050738A1 - Dispositif d'affichage a formats multiples - Google Patents

Dispositif d'affichage a formats multiples Download PDF

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Publication number
WO2001050738A1
WO2001050738A1 PCT/EP2000/012721 EP0012721W WO0150738A1 WO 2001050738 A1 WO2001050738 A1 WO 2001050738A1 EP 0012721 W EP0012721 W EP 0012721W WO 0150738 A1 WO0150738 A1 WO 0150738A1
Authority
WO
WIPO (PCT)
Prior art keywords
format
bands
dark bands
display device
displaying
Prior art date
Application number
PCT/EP2000/012721
Other languages
English (en)
Inventor
Jeffrey L. Johnson
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to KR1020017010979A priority Critical patent/KR20010103781A/ko
Priority to JP2001550992A priority patent/JP2003519972A/ja
Priority to EP00983325A priority patent/EP1173974A1/fr
Publication of WO2001050738A1 publication Critical patent/WO2001050738A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
    • H04N7/0122—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal the input and the output signals having different aspect ratios
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems

Definitions

  • This invention relates to a display device for color television, and more particularly relates to such a display device capable of displaying more than one format of television signal.
  • Cathode Ray Tubes (CRTs) for color television are generally designed to display the standard television format having a 4x3 aspect ratio, ie, the ratio of the width to the height of the display image is 4:3.
  • CRTs have been designed specifically to display the 16x9 format. However, since it is anticipated that television programming will include content in both the 4x3 and the 16x9 formats for the foreseeable future, a CRT capable of displaying both formats should appeal to a larger segment of the market.
  • a multi-format display device having a viewing area with an aspect ratio of approximately 13.4x9 to 13.5x9, which results in vertical and horizontal dark bands of approximately equal thickness when displaying the 4x3 and 16x9 formats, respectively.
  • a multi-format display device for displaying 4x3 and 16x9 formats centered in the viewing area in a manner to result in vertical dark bands of approximately equal thickness in the case of the 4x3 format and horizontal dark bands of approximately equal thickness in the case of the 16x9 format, the viewing area having an aspect ratio which results in vertical and horizontal dark bands of approximately equal thicknesses when displaying the 4x3 and 16x9 formats, respectively.
  • thickness means the shortest dimension, ie, the height in the case of the horizontal bands and the width in the case of the vertical bands. Such dark bands of equal thickness minimize the overall obtrusive impact of the black bars when viewers switch between different formats.
  • such dark bands of equal thickness minimize image distortion when the images are stretched to reduce or eliminate the dark bands.
  • such equal bands facilitate the design of electronic stretching means to stretch the 16x9 signals vertically and the 4x3 signals horizontally to reduce or eliminate the dark bands.
  • Figs. 1(a) and 1(b) show a multi-format CRT display of the prior art, displaying a 16x9 format and a 4x3 format, respectively;
  • Figs. 2(a) and 2(b) show a multi-format display of the invention, displaying a 16x9 format and a 4x3 format, respectively.
  • Figure 1(a) shows a multi-format CRT display 10 of the prior art having a width w and a height h, and an aspect ratio w:h of 13.86:9.
  • a 16x9 format image 12 has a width equal to w and a height equal to h - 2Ht, where Ht is the thickness of the dark horizontal bands 14 and 16.
  • Figure 1(b) shows the same multi-format CRT display 10 having a 4x3 format image 17 with a height equal to h and a width equal to w - 2Vt, where Vt is the thickness of the dark vertical bands 18 and 19.
  • Vt is the thickness of the dark vertical bands 18 and 19.
  • Figure 2(a) shows a multi-format display 20 of the invention having a width w and a height h, and an aspect ratio w:h of 13.44:9.
  • a 16x9 format image 22 has a width equal to w and a height equal to h - 2Ht, where Ht is the thickness of the dark horizontal bands 24 and 26.
  • Figure 2(b) shows the same multi-format display 20 having a 4x3 format image 27 with a height equal to h and a width equal to w - 2Vt, where Vt is the thickness of the dark vertical bands 28 and 29.
  • Vt and Ht are very nearly equal. This not only results in a less distracting appearance as a viewer switches from one format to the other, but it also minimizes the amount of image stretch needed to reduce the size of the bands or to eliminate the bands entirely, so as to fill the viewing area entirely. Such minimal stretch results in minimal image distortion.
  • dark bands of equal thickness greatly facilitate the design of the image-stretching circuitry.
  • an exemplary multi-format CRT display of the invention (equal bands) having a nominal diagonal measurement of 32 inches is compared to a multi-format CRT of the prior art (equal areas) having the same nominal diagonal measurement.
  • CTR displays While the invention has been described mainly in terms of CRT displays, it applies to any display type capable of displaying video information, including liquid crystal displays, plasma displays, plasma activated liquid crystal displays, foil displays and field emission displays.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Graphics (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Television Systems (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

La présente invention concerne un dispositif d'affichage à formats multiples, tel qu'un tube cathodique (cathode ray tube / CRT), servant à afficher des formats 4x3 et 16x9. Ledit dispositif a un rapport hauteur/largeur de sorte que les bandes sombres verticales associées au format 4x3 ont approximativement la même largeur que les bandes sombres horizontales associées au format 16x9, ce qui permet de minimiser l'obstrusivité des bandes sombres et la distorsion d'image lorsque les images sont étirées pour remplir la zone de visualisation.
PCT/EP2000/012721 1999-12-30 2000-12-14 Dispositif d'affichage a formats multiples WO2001050738A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020017010979A KR20010103781A (ko) 1999-12-30 2000-12-14 다중-포맷 디스플레이 디바이스
JP2001550992A JP2003519972A (ja) 1999-12-30 2000-12-14 マルチフォーマット表示装置
EP00983325A EP1173974A1 (fr) 1999-12-30 2000-12-14 Dispositif d'affichage a formats multiples

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47673499A 1999-12-30 1999-12-30
US09/476,734 1999-12-30

Publications (1)

Publication Number Publication Date
WO2001050738A1 true WO2001050738A1 (fr) 2001-07-12

Family

ID=23893032

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/012721 WO2001050738A1 (fr) 1999-12-30 2000-12-14 Dispositif d'affichage a formats multiples

Country Status (5)

Country Link
EP (1) EP1173974A1 (fr)
JP (1) JP2003519972A (fr)
KR (1) KR20010103781A (fr)
TW (1) TW515202B (fr)
WO (1) WO2001050738A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI464666B (zh) * 2012-05-03 2014-12-11 Asustek Comp Inc 顯示方法與可攜式裝置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269955A (en) * 1992-08-07 1994-02-23 British Broadcasting Corp Method of showing 16:9 pictures on 4:3 displays
JPH06275213A (ja) * 1993-03-17 1994-09-30 Asahi Glass Co Ltd 陰極線管

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269955A (en) * 1992-08-07 1994-02-23 British Broadcasting Corp Method of showing 16:9 pictures on 4:3 displays
JPH06275213A (ja) * 1993-03-17 1994-09-30 Asahi Glass Co Ltd 陰極線管

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"WIDE-SCREEN-SIGNALISIERUNG", FERNSEH UND KINOTECHNIK,DE,VDE VERLAG GMBH. BERLIN, vol. 49, no. 7/08, 1 July 1995 (1995-07-01), pages 429 - 434,436-437, XP000525913, ISSN: 0015-0142 *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 681 (E - 1649) 21 December 1994 (1994-12-21) *

Also Published As

Publication number Publication date
KR20010103781A (ko) 2001-11-23
JP2003519972A (ja) 2003-06-24
TW515202B (en) 2002-12-21
EP1173974A1 (fr) 2002-01-23

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