EP1550143A1 - Tube cathodique a profondeur reduite - Google Patents

Tube cathodique a profondeur reduite

Info

Publication number
EP1550143A1
EP1550143A1 EP03748091A EP03748091A EP1550143A1 EP 1550143 A1 EP1550143 A1 EP 1550143A1 EP 03748091 A EP03748091 A EP 03748091A EP 03748091 A EP03748091 A EP 03748091A EP 1550143 A1 EP1550143 A1 EP 1550143A1
Authority
EP
European Patent Office
Prior art keywords
cathode ray
ray tube
thickness
diagonal
screen
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.)
Withdrawn
Application number
EP03748091A
Other languages
German (de)
English (en)
Inventor
Paul Sterken
Mohammed Khalil
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.)
LG Philips Displays Netherlands BV
Original Assignee
LG Philips Displays Netherlands BV
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 LG Philips Displays Netherlands BV filed Critical LG Philips Displays Netherlands BV
Priority to EP03748091A priority Critical patent/EP1550143A1/fr
Publication of EP1550143A1 publication Critical patent/EP1550143A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/861—Vessels or containers characterised by the form or the structure thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/86—Vessels and containers
    • H01J2229/8613—Faceplates
    • H01J2229/8616—Faceplates characterised by shape
    • H01J2229/862—Parameterised shape, e.g. expression, relationship or equation

Definitions

  • the invention relates to a cathode ray tube comprising an panel portion with a long axis, a short axis and a diagonal, a funnel portion and a neck portion comprising an electron gun for generating one or more electron beam(s), and a deflection system mounted on said funnel portion for generating electromagnetic fields for deflecting said electron beam(s).
  • the invention also relates to a panel portion for a cathode ray tube.
  • the invention also relates to a display apparatus comprising a CRT.
  • cathode ray tubes CRT's
  • cathode ray tubes with a shadow mask There exist various types of cathode ray tubes, the best known of which are cathode ray tubes with a shadow mask.
  • Other types of cathode ray tubes are e.g. index tubes and tubes in which a stretched mask is used.
  • Cathode ray tubes as a type of display device have to compete with various other types of display devices, such as LCD's PDP' etc. These various types all have their advantages and disadvantages.
  • One of the disadvantages of the CRT compared to other types of display devices is the depth of the CRT.
  • various approaches in reducing the depth of the CRT have been proposed.
  • the depth of a CRT has (expressed as a function of the diagonal D of the CRT) been greater than approximately 0.6 times D, i.e. approximately 1.5 cm depth per inch diagonal.
  • the depth reduction of the cathode ray tube is in particular of importance for CRT with a large diagonal D, above 27 inches.
  • the cathode ray tube has a diagonal of preferably more than 28 inches, that the panel portion has upstanding wall having a seal edge having a thickness at the end of the short axis of 0.019D to 0.0275D, preferably between 0.021D to 0.025D, where D is the length of the diagonal of the screen, and a front part having a thickness at least 10% smaller than the thickness of the seal edge of the panel portion and that the depth of the cathode ray tube at a point halfway between the centre of the screen and the end of the diagonal is smaller than 0.3D.
  • the aim of the invention is to provide a new type of cathode ray tube having a depth substantially smaller than conventional.
  • a cathode ray tube in general at least comprises a panel portion and funnel portion, which are joined at a seal edge.
  • the vacuum stress at the seal-edge is increased much above the allowed maximum limit (approximately 10 MPa).
  • the seal-edge thickness is in the range of 11-14 mm (i.e. between 0.013 and 0.017D, D expressed in cm).
  • the stress is also increasing above allowed limit [ 10 Mpa] at the funnel body.
  • the invention is based on the insight that by increasing substantially the thickness of the seal edge in particular at the end of the short axis relatively to the center face thickness, the weight of the tube as a whole may be kept within reasonable limits. This seems prima facie illogical, the thickness of the edge is increased substantially in comparison to standard design, by some 25-50%, which would seem to mean an substantial increase in weight, contrary to the object of the invention.
  • the bulk of the weight is formed by the front part of the panel portion.
  • the thickness of the front part may be kept the same or even reduced, which safes weight.
  • the funnel portion can be made much shorter than standard funnels, without substantial increase in thickness of the funnel which also reduces the weight of the tube further.
  • the weight of the tube is kept on pair or even reduced in comparison to standard designs, while the depth is strongly reduced without compromising the strength of tube.
  • the depth at the quarter diagonal of the resulting tube is less than 0.3D.
  • a 60 cm standard depth cupboard can accommodate, using the invention, a TV of up to approximately 42 inches (105 cm), whereas at present only TV sets up to approximately 28 to 30, maximum 32 inches may be accommodated.
  • the panel height [H pan ei see figure 2] is between 92 and 100 mm, preferably between 94 and 97 mm. This is substantially less than the conventional height that lies around 110-120 mm.
  • the appreciable increase in thickness of the seal edge enables the reductions of the height of the panel without compromising the strength of the tube. This leads to a further reduction in weight and tube depth , and also increases the thermal processing speed of CRT's.
  • the thickness of the seal edge is substantially uniform around the circumference of the tube.
  • the thickness of the seal edge is non uniform: highest at the ends of the short axis, smallest at the corners, and increasing from the corners, the thickness at the end of the long axis being smaller than at the end of the short axis. See figure 6.
  • the height H D/4 is equal or less than 0.25D (H D/4 ⁇ 0.25D)
  • Fig. 1 illustrates a cathode ray tube and a picture display device in accordance with the invention.
  • Fig.2 shows a front panel of a cathode ray tube.
  • Fig. 3 shows a cross-sectional view of a panel portion and a funnel portion.
  • Fig. 4 shows a panel portion
  • Fig. 5 shows thermal speed as a function of a ratio of panel portion parameters.
  • Fig. 6 shows uniform and not uniform seal edge thickness distribution.
  • FIG.1 A cathode ray tube and a picture display device according to a preferred embodiment of the invention is shown in FIG.1.
  • It comprises a cathode ray tube 1, which includes a panel portion, sometimes also called a display window 2, a funnel portion 3, and a neck portion 4 (or neck as it is called hereinbelow).
  • a means 5 for generating electron beam(s) in this example three in-line electron beams 6, the in-line plane being parallel to the long axis of the display screen, such means are herewithin in short described by the word "electron gun” .
  • a means for generating an electron beam is usually an in-line electron gun. Such designs are standard designs.
  • the inner surface of the panel portion 2 comprises a large number of phosphor elements which form a display screen 8.
  • the middle one of the electron beams 6 substantially coincides with the tube axis 7.
  • the direction of the tube axis is hereinbelow denoted by the z-direction.
  • the direction along the long axis of the display screen is denoted by the x-direction, the direction along the short axis of the display screen by the y-direction.
  • the line scanning direction i.e.
  • the direction in which scanning with the highest frequency takes place is usually parallel to the long axis (the x-direction) of the display screen.
  • the electron beams 6 are deflected by means of a deflection system 9 covering a part 3a of the funnel portion 3. It is in particular this part 3a of the outer contour that the invention relates to.
  • Said deflection system 9 comprises a line deflection subsystem 12 and a frame deflection subsystem 13, in order to create a two-dimensional picture on the display screen 8.
  • the deflection system 9 is made up of sets of coils, one set for the line deflection subsystem 12 and another set for the frame deflection subsystem 13.
  • the outer circumference of the funnel portion comprises a first section I near the neck and a second portion II further away from the neck, more towards the screen.
  • the figure shows a standard in-line CRT, it is remarked that, although the invention is very useful for such designs, other types of CRT, e.g. index tubes or CRT with stretched masks, or CRT in which the line scanning direction is along the short axis (so- called transverse scanning CRT's) exist and the present invention in equally applicable to such types of CRT's.
  • the figure also indicates the x-direction, i.e. the direction along the long axis of the display screen and the z-direction.
  • the z-coordinate of the deflection plane is usually (and hereinbelow) taken to be zero, with positive values of z being closer to the display screen.
  • the panel portion (8) has an elongated shape with two perpendicular axes of symmetry : a long axis whose length, measured from screen end to screen end, is Lscr and a short axis whose length is Sscr.
  • the panel portion comprises an upstanding wall 21 and a front part 22.
  • the upstanding wall has a seal edge 21a.
  • the seal edge is the position where the separately manufactured panel portion and funnel portion (which may form an integral unit with the neck portion) are sealed together.
  • the thickness of the edge is given as T, wherein the thickness at the end of the short axis is denoted Ts h o rt , the thickness at the end of the long axis as T ⁇ on and the thickness in the corners (end of diagonal) as Tcorner-
  • the height of the edge is denoted by H pan6 ⁇ , the thickness of the front part as T ⁇ -ont, wherein the thickness is taken at the centre of the screen.
  • Figure 2 also shows the maximum deflection angle ⁇ as being the angle between the tube axis (7) and the deflected electron beam (10) when the electron beam is deflected so as to hit a point on the display screen which is the furthest away from the intersection between the tube axis (7) and the display screen.
  • Ascr is usually 4/3 (1.333) or 16/9 (1.78)
  • Figure 3 shows a CRT in cross-sectional view.
  • the depth H D/4 which is the depth taken at a point D/4, i.e. a point on the diagonal a distance D/4 from the centre, i.e. halfway in between the centre and the comer of the screen.
  • Htotai the total depth of the cathode ray tube.
  • the present invention provides for a cathode ray tube having a reduced depth comparison to standard CRT's.
  • the cathode ray tube has an increased seal-edge thickness T at least at the end of the short axis.
  • the thickness is increased to a level between 15-22 mm, preferably 17-20 mm
  • the seal edge thickness when expressed as a function of diagonal dimension D is between 0.019D to 0.0275D, preferably 0.021 D to 0.025D.
  • the center face thickness is kept lower than the thickness of the seal edge at the end of the short axis, e.g. at the standard level of 12-16 mm. This results in a reduction of the seal-edge vacuum stress to allowed stress levels and in thermal speeds competitive with standard CRT products.
  • the depth of the cathode ray tube at a point halfway between the centre of the screen and the end of the diagonal, i.e. HD/4, is smaller than 0.3D. This enables a very small total depth H tota i of the CRT.
  • the height of the panel portion 2 H pane ⁇ lies between 92 and 100 mm, preferably between 94 and 97 mm. A reduction in weight and depth is thereby achieved.
  • the thickness at the seal edge may be uniform, i.e. everywhere the same around the cfrcumference.
  • the thickness is largest at the end of the short axis, smallest at the corners, and has an intermediate value at the end of the long axis, i.e. T S 0 rt > Tiong > T CO rner- A decrease in weight and making the picture view on pare with standard CRT as well as an increase in CRT thermal processing speed are possible. Table 1 shows this effect for a 32 inch tube.
  • Figure 6 illustrate at the left hand side in cross-section a panel for which it holds and on the right hand side a panel for which it holds T S hort > Tiong > T C orne r .
  • the invention is applicable to any type of CRT.
  • the funnel portion has, under the deflection unit, a substantially rectangular cross-section.
  • RAC RectAngular Coil
  • Such so-called RAC (RectAngular Coil)-type tubes allow the deflection coils of the deflection unit to come closer to the electron beam, thereby reducing energy consumption and reducing heat production.
  • a cathode ray tube (1) comprises an panel portion (2), a funnel portion (3) and a neck portion (4) with an electron gun (5).
  • the screen of the cathode ray tube has a diagonal D of preferably more than 27 inches.
  • the panel portion (2) has a seal edge (21a) with a thickness (Tshort ) at the end of the short axis of 0.019D to 0.0275D, where D is the length of the diagonal of the screen, and a front part (22) having a thickness (T& 0nt ) at least 10% smaller than the thickness (T S h 0r t) of the edge of the panel portion.
  • the depth of the cathode ray tube at a point halfway between the centre of the screen and the end of the diagonal is less than 0.3D (H D/4 ⁇ 0.3D).

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Abstract

L'invention porte sur un tube cathodique (1) comprenant un panneau (2), un cône (3) et un col (4) pourvu d'un canon électronique (5). L'écran du tube cathodique a une diagonale D supérieure à 28 pouces. Le panneau (2) a un bord d'étanchéité (21a) d'une épaisseur (Tshort), à l'extrémité de l'axe court, comprise entre 0,019D et 0,0275D, D représentant la longueur de la diagonale de l'écran, et une partie frontale (22) ayant une épaisseur (Tfront ) d'au moins 10 % inférieure à l'épaisseur (Tshort ) du bord du panneau. La profondeur du tube cathodique a un point médian entre le centre de l'écran et l'extrémité de la diagonale inférieur à 0,3D (HD/4<0,3D).
EP03748091A 2002-10-02 2003-09-20 Tube cathodique a profondeur reduite Withdrawn EP1550143A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03748091A EP1550143A1 (fr) 2002-10-02 2003-09-20 Tube cathodique a profondeur reduite

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP02079576 2002-10-02
EP02079576 2002-10-02
PCT/EP2003/010697 WO2004032173A1 (fr) 2002-10-02 2003-09-20 Tube cathodique a profondeur reduite
EP03748091A EP1550143A1 (fr) 2002-10-02 2003-09-20 Tube cathodique a profondeur reduite

Publications (1)

Publication Number Publication Date
EP1550143A1 true EP1550143A1 (fr) 2005-07-06

Family

ID=32050084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03748091A Withdrawn EP1550143A1 (fr) 2002-10-02 2003-09-20 Tube cathodique a profondeur reduite

Country Status (4)

Country Link
EP (1) EP1550143A1 (fr)
CN (1) CN100343940C (fr)
AU (1) AU2003267412A1 (fr)
WO (1) WO2004032173A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100624993B1 (ko) * 2004-06-26 2006-09-20 엘지.필립스 디스플레이 주식회사 음극선관
ITMI20041929A1 (it) * 2004-10-12 2005-01-12 Videocolor Spa Involucro in vetro per tubo a raggi catodici
CN101246798B (zh) * 2008-03-12 2010-06-02 河南安彩高科股份有限公司 彩色阴极射线管用减薄型全平玻屏

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW373214B (en) * 1996-12-18 1999-11-01 Toshiba Corp Color cathode ray tube and its fabricating method
JPH11288676A (ja) * 1997-12-10 1999-10-19 Toshiba Corp カラー受像管
US6417613B1 (en) * 1998-12-28 2002-07-09 Nippon Electric Glass Co., Ltd. Cathode ray tube glass panel
KR100600892B1 (ko) * 2001-07-23 2006-07-14 엘지.필립스 디스플레이 주식회사 음극선관

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004032173A1 *

Also Published As

Publication number Publication date
CN100343940C (zh) 2007-10-17
WO2004032173A1 (fr) 2004-04-15
AU2003267412A1 (en) 2004-04-23
CN1708825A (zh) 2005-12-14

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