GB2292478A - Television apparatus - Google Patents
Television apparatus Download PDFInfo
- Publication number
- GB2292478A GB2292478A GB9416193A GB9416193A GB2292478A GB 2292478 A GB2292478 A GB 2292478A GB 9416193 A GB9416193 A GB 9416193A GB 9416193 A GB9416193 A GB 9416193A GB 2292478 A GB2292478 A GB 2292478A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electron gun
- screen
- video image
- video signal
- units
- 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- Withdrawn
Links
Classifications
-
- 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
- H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
- H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
- H01J31/203—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2231/00—Cathode ray tubes or electron beam tubes
- H01J2231/12—CRTs having luminescent screens
- H01J2231/125—CRTs having luminescent screens with a plurality of electron guns within the tube envelope
- H01J2231/1255—CRTs having luminescent screens with a plurality of electron guns within the tube envelope two or more neck portions containing one or more guns
Landscapes
- Transforming Electric Information Into Light Information (AREA)
Abstract
Television apparatus comprises a single glass envelope (21) providing on its front side a screen for displaying a video image and supporting on its rear side a plurality of three-beam electron gun units. The electron gun units are arranged at regular positions and adapted to produce corresponding portions of a video image on the screen (22) in order to form a complete and continuous video image. <IMAGE>
Description
TELEVISION APPARATUS
The present invention relates to television apparatus, namely television sets or receivers.
According to the invention, there is provided television apparatus which comprises a casing, a three-beam electron gun assembly provided within the casing, and internal electronic control circuitry for controlling the operation of the electron gun assembly, wherein the electron gun assembly comprises a single glass envelope providing on its front side a screen for displaying video image and supporting on its rear side a plurality of three-beam electron gun units which are arranged at regular positions and adapted to produce corresponding portions of a video image on the screen in order to form the complete and continuous video image.
Preferably, the electronic control circuitry includes a video signal switcher and a plurality of video signal receivers associated with the corresponding electron gun units, said video signal switcher being adapted to split up an incoming video signal into segments and feed the segments to the video signal receivers sequentially and repeatedly according to the portions of the video image to be produced by the corresponding electron gun units.
The invention will now be more particularly described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a partially broken away perspective view of a three-beam electron gun assembly of a conventional television set;
Figure 2 is a top plan view of four electron gun assemblies of the type as shown in Figure 1, which are stacked together in a two-by-two arrangement;
Figure 3 is a front view of a combined screen of the arrangement of Figure 2;
Figure 4 is a partially broken away perspective view of a three-beam electron gun assembly of an embodiment of television apparatus in accordance with the invention, which electron gun assembly incorporates four three-beam electron gun units arranged in a two-by-two manner;
Figure 5 is a top plan view of the electron gun assembly of
Figure 4; and
Figure 6 is a front view of the screen of the electron gun assembly of Figure 4;
Figure 7 is a schematic flow chart diagram illustrating how the television apparatus of Figure 4 works.
Referring firstly to Figure 1 of the drawings, a tri-colour or three-beam electron gun assembly 10 for a conventional television set is shown, which assembly 10 has a sealed glass envelope 11. The envelope 11 provides on its front side a screen 12 and supports centrally on its rear side an internal three-beam electron gun unit 13. The screen 12 is formed, from rear to front, by a shadow mask layer having an array of regularly spaced fine vertical slots, a screen layer bearing an array coating of regularly spaced discontinuous vertical phosphor stripes, and the front wall of the glass envelope 11. The electron gun unit 13 is formed by three separate electron guns for producing corresponding electron beams for colours red, blue and green.
The electron gun unit 13 further includes deflector coils positioned right in front of the three electron guns. The three electron beams pass through the deflector coils and are then directed through the shadow mask layer, which acts as a colour separator, and finally focused onto the phosphor stripes of a specific pixel (picture element) for the corresponding colours. The deflector coils cause the three electron beams to repeatedly scan the screen 12 sequentially at high speed across the pixels from left to right and top to bottom, thereby making the phosphor stripes glow red, blue and green at each pixel in order to form a video image occupying the complete screen 12.
The electron guns have a limited electron beam angular coverage. Because of this limitation, the electron gun unit 13 must be positioned behind the screen 12 over a certain minimum distance apart, said distance being proportional to the size of the screen 12. Accordingly, the screen size of existing television sets is normally limited to below about 127cm (50 inches).
In order to build a video display system having a relatively large screen but a restricted thickness, it is known and necessary to stack several such television sets or units together in, for example, a two-by-two arrangement as shown in Figures 2 and 3. The whole screen display is divided into four equal parts which are arranged to be covered by the corresponding television units under the control of a AV or video signal switcher. The video signal switcher splits up the video image sequentially for the four television units. Since the television units have a screen size or area equal to one quarter of that of the whole screen display, their thickness is considerably smaller than that would otherwise be required if the whole screen display were to be provided by a single over-sized television set.Accordingly, the thickness of the entire video display system is relatively much reduced.
Such a video display system, however, has a shortcoming in that the video image displayed on the screen is unavoidably interrupted by a cross "+" which is formed by adjoining sides of the individual television units.
Referring now to Figures 4 to 6 of the drawings, there is shown a three-beam electron gun assembly 20 for television apparatus, in the form of a television receiver or set, embodying the invention. The television set has a casing within which the electron gun assembly 20 is housed, and incorporates internal electronic control circuitry for controlling the operation of the electron gun assembly 20.
The electron gun assembly 20 has a single sealed glass envelope 21 which provides on its front side a screen 22.
On the rear side, the electron gun assembly 20 supports internally an array of four separate three-beam electron gun units 23. The electron gun units 23 have a construction essentially the same as that of the electron gun unit 13 of the conventional television set as described above.
The screen 22 is functionally divided into four equal portions arranged in a two-by-two manner. Each electron gun unit 23 is centrally aligned with the corresponding screen portion, and is responsible for producing that portion of a complete video image to be displayed on the screen 22.
The electronic control circuitry includes a video signal switcher and four separate video signal receivers associated with the corresponding electron gun units 23.
Both the constructions and principles of operation of such video signal switcher and receivers are generally known in the art and therefore will not be herein described.
The operation of the television set is illustrated in
Figure 7. Television signal transmitted by, for example, a satellite (A) is received by a local ground receiver/ transmitter station (B) and subsequently re-emitted by the station to local air. The television signal is picked up by an antenna of the television set and is then decoded by a decoder. The decoded television image signal is processed by the video signal switcher (C), which splits up the image signal into segments and feed them sequentially and repeatedly to the video receivers (D) of the respective electron gun units 23 (E), according to the portions of the video image to be covered by the electron gun units 23.
The electron gun units 23 are controlled to scan the screen 22 (F) in turn and repeatedly line-by-line at high speed in order to form the complete video image on the screen 22.
The resulting video image on the screen 22 is continuous and not interrupted, as shown in Figure 6.
It is envisaged that up to twelve or more such three-beam electron gun units 23 may be integrated to form one single electron gun assembly 20. As each electron gun unit 23 is responsible for producing only a portion of the video image to be displayed on the screen 22, it can be positioned as close as possible behind the screen 22, thereby allowing the overall television set concerned to be made relatively thin. As the screen 22 is not formed by separate, relatively smaller screens but has an integral one-piece construction, the video image displayed is continuous and not interrupted.
It is also envisaged that the television apparatus of the invention may be manufactured to be a domestic size television set or receiver having a reduced thickness.
The invention has been given by way of example only, and various modifications of and/or alterations to the described embodiment may be made by persons skilled in the art without departing from the scope of the invention as specified in the appended claims.
Claims (3)
1. Television apparatus comprising a casing, a three-beam electron gun assembly provided within the casing, and internal electronic control circuitry for controlling the operation of the electron gun assembly, wherein the electron gun assembly comprises a single glass envelope providing on its front side a screen for displaying video image and supporting on its rear side a plurality of threebeam electron gun units which are arranged at regular positions and adapted to produce corresponding portions of a video image on the screen in order to form the complete and continuous video image.
2. Television apparatus as claimed in claim 1, wherein the electronic control circuitry includes a video signal switcher and a plurality of video signal receivers associated with the corresponding electron gun units, said video signal switcher being adapted to split up an incoming video signal into segments and feed the segments to the video signal receivers sequentially and repeatedly according to the portions of the video image to be produced by the corresponding electron gun units.
3. Television apparatus substantially as hereinbefore described with reference to Figures 4 to 7 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9416193A GB2292478A (en) | 1994-08-10 | 1994-08-10 | Television apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9416193A GB2292478A (en) | 1994-08-10 | 1994-08-10 | Television apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9416193D0 GB9416193D0 (en) | 1994-09-28 |
| GB2292478A true GB2292478A (en) | 1996-02-21 |
Family
ID=10759701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9416193A Withdrawn GB2292478A (en) | 1994-08-10 | 1994-08-10 | Television apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2292478A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0201865A2 (en) * | 1985-05-10 | 1986-11-20 | Kabushiki Kaisha Toshiba | Color cathode ray tube |
| EP0235894A1 (en) * | 1986-01-22 | 1987-09-09 | Kabushiki Kaisha Toshiba | Colour cathode ray tube device |
| US4714856A (en) * | 1985-05-10 | 1987-12-22 | Kabushiki Kaisha Toshiba | Color cathode ray tube with plural electron gun assemblies |
| EP0356823A1 (en) * | 1988-08-30 | 1990-03-07 | Kabushiki Kaisha Toshiba | Color cathode ray tube and envelope for use with the color cathode ray tube |
| EP0520795A1 (en) * | 1991-06-28 | 1992-12-30 | Kabushiki Kaisha Toshiba | Color cathode ray tube |
| EP0548467A1 (en) * | 1991-12-26 | 1993-06-30 | Kabushiki Kaisha Toshiba | Cathode-ray tube wherein plural regions of phosphor screen are scanned independently of one another |
| WO1993021651A1 (en) * | 1992-04-21 | 1993-10-28 | Kabushiki Kaisha Toshiba | Cathode ray tube apparatus and method of manufacturing the same |
-
1994
- 1994-08-10 GB GB9416193A patent/GB2292478A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0201865A2 (en) * | 1985-05-10 | 1986-11-20 | Kabushiki Kaisha Toshiba | Color cathode ray tube |
| US4714856A (en) * | 1985-05-10 | 1987-12-22 | Kabushiki Kaisha Toshiba | Color cathode ray tube with plural electron gun assemblies |
| EP0235894A1 (en) * | 1986-01-22 | 1987-09-09 | Kabushiki Kaisha Toshiba | Colour cathode ray tube device |
| EP0356823A1 (en) * | 1988-08-30 | 1990-03-07 | Kabushiki Kaisha Toshiba | Color cathode ray tube and envelope for use with the color cathode ray tube |
| EP0520795A1 (en) * | 1991-06-28 | 1992-12-30 | Kabushiki Kaisha Toshiba | Color cathode ray tube |
| EP0548467A1 (en) * | 1991-12-26 | 1993-06-30 | Kabushiki Kaisha Toshiba | Cathode-ray tube wherein plural regions of phosphor screen are scanned independently of one another |
| WO1993021651A1 (en) * | 1992-04-21 | 1993-10-28 | Kabushiki Kaisha Toshiba | Cathode ray tube apparatus and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9416193D0 (en) | 1994-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |