CN2595108Y - Cathode-ray tube rear-projection color Tv-set for supporting multiple scanning form - Google Patents
Cathode-ray tube rear-projection color Tv-set for supporting multiple scanning form Download PDFInfo
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- CN2595108Y CN2595108Y CN 01230881 CN01230881U CN2595108Y CN 2595108 Y CN2595108 Y CN 2595108Y CN 01230881 CN01230881 CN 01230881 CN 01230881 U CN01230881 U CN 01230881U CN 2595108 Y CN2595108 Y CN 2595108Y
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Abstract
The utility model discloses a color back-projection type television which supports multiple scanning formats, and solves the defects of the existing and color back-projection type television, for example, interline flicker and image flicker with large area are eliminated. The color back-projection type television can support multiple media displays, also has the function of the image processing, and can form economically and respectively a combined display screen system. The utility model is formed by that a digital scan format converter is additionally arranged in the existing back-projection type television, different scan formats which come from different media are changed into the same scan format through the digital scan format converter, and thereby, the purpose of the utility model is realized.
Description
Technical field
The utility model relates to the colored back projection type television set of a kind of cathode ray tube, especially relates to a kind of colored back projection type television set of cathode ray tube of supporting multiple scan format.
Background technology
Along with the sustainable development of modern society and the continuous progress of scientific and technological level, various household electrical appliance are come into huge numbers of families gradually.Now, color television set has had very high popularity rate in China town-dweller-rural-family, and the research of relevant television set is also constantly being carried out.The colored back projection type television set of cathode ray tube is as a kind of newer image display device, owing to have large-screen, high-resolution, high-contrast, good characteristics such as colour reproduction, progressively be widely used in various public arenas and the increasing family.But as a kind of product, also inevitably there are some shortcomings in the colored back projection type television set of cathode ray tube, and these shortcomings have hindered this television set to have better effect and used widely.
Mainly there is following shortcoming in the colored back projection type television set of existing cathode ray tube:
1 is the same with common television set, the colored back projection type television set of existing cathode ray tube also is to adopt interlace mode, and the line number of scanning is less, thereby cause the defective that between different scan lines, has interline flicker and scan line rustic, especially when viewing distance is nearer, even the capable structure of visual scan.Obviously, screen size is big more, and this defective is just outstanding more, and large-sized solor back projection type television set is because its relative viewing distance (with respect to screen height) is nearer, so this problem is also more obvious.
2, because the scanning field frequency of the colored back projection type television set of existing cathode ray tube near the critical flicker frequency of human eye, thereby can be seen the large-area flicker of image when watching this television set.
3, the colored back projection type television set of existing cathode ray tube just designs as a kind of family expenses color television set of more large-screen, therefore also just can only receive common colour TV signal, can not use as the display terminal of multiple medium, and its scan format can not be supported the demonstration of multiple medium.
4, the same one reason is the same, and the colored back projection type television set of existing cathode ray tube also only possesses the signal processing and the Presentation Function of general television set, does not have as special signal processing functions such as pantographies.If when adopting the colored back projection type television set of cathode ray tube to make the combined display screen system like this as display unit, just must in system, increase a digital picture dispenser, and the digital picture dispenser costs an arm and a leg, and makes the cost of system increase greatly accordingly.
The purpose of this utility model is: propose a kind of colored back projection type television set of cathode ray tube that can support multiple scan format, make it have accurate scan line structure, so that can eliminate large-area image flicker on interline flicker and the screen, support the display mode of multiple medium, and have graphics processing function, can be combined into the combined display screen system easily with lower cost.
The purpose of this utility model is achieved in that
A kind of colored back projection type television set of cathode ray tube of supporting multiple scan format comprises high-frequency tuner, intermediate frequency amplification and video demodulator, machine system controller, digit convergence circuit, line-field sweep circuit,
And,
Above-mentioned a kind of colored back projection type television set of cathode ray tube of multiple scan format of supporting also comprises
One AV conversion switch is used for vision signal, component signal are selected to switch, and the unified component signal that is converted to;
One digital scan format converter, the different scanning format conversion that is used for multiple medium is with a kind of scan format;
Video decode and treatment circuit are used for the TV component signal that described digital scan format converter transform is same scan format is decoded and image processing.
Simultaneously,
Above-mentioned digital scan format converter is provided with one and selects circuit, is used for selecting from the TV component signal of described AV conversion switch and from the SVGA signal R.G.B.H.V of outside.
Above-mentioned digital scan format converter is provided with a up conversion circuit, is used for carrying out the TV component signal that up conversion is same scan format from the TV component signal of described AV conversion switch and from the SVGA signal RGBHV of outside.
Above-mentioned digital scan format converter is set to have the circuit of digitlization figure treatment technology.
By above-mentioned technical scheme, and selection has the number of scanning lines of enough scanning line densities, the utility model has just had accurate scan line structure, has also just eliminated the flicker of interline flicker and picture of large image scale accordingly, effectively can not differentiate the scan line structure in the viewing distance; Imaging signal processing circuit designs with the highest picture signal of sweep speed in the multiple media signal, also can avoid the reduction of picture quality after the scan format conversion.Support the display mode of multiple medium simultaneously, and, make to the utlity model has graphics processing function, can form the combined display screen system easily by less expensive owing in the digital scan format converter, introduce the digitlization image processing techniques.
Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing,, can more clearly find out advantage of the present utility model place by detailed description to the utility model preferred embodiment.
Description of drawings
Fig. 1 is the system block diagram of the colored back projection type television set of cathode ray tube of the present utility model.
Embodiment
As Fig. 1, the radio television signal that antenna 18 receives is selected channel through high-frequency tuner 1, and after being converted to medium-frequency TV signal (IF), sending into intermediate frequency and amplify and video demodulator 2.After intermediate frequency amplification and 2 pairs of signals of video demodulator carry out intermediate frequency amplification and video demodulator, form vision signal (VIDEO-TV) and second accompanying sound intermediate frequency signal (SIF), this vision signal (VIDEO-TV) is admitted to AV conversion switch 4, and second accompanying sound intermediate frequency signal (IF) is sent into acoustic processing and amplifying circuit 3, second accompanying sound intermediate frequency signal (SIF) is carried out fm demodulation or carry out the demodulation of NICAM digital stereo and form audio signal by it, select this audio signal then or carry out Audio Processing and amplification by the external audio signal that AV conversion switch 4 is sent here, last power output audio signal is to left channel loudspeaker 16 and right channel loudspeaker 17.
Still as Fig. 1, AV conversion switch 4 will be selected and switch from the vision signal (VIDEO) of outside input, component signal and by the vision signal (VIDEO-TV) that intermediate frequency amplifies and video demodulator 2 is sent here, and unify to be converted to component signal, then this component signal is sent into digital scan format converter 5.
Still as Fig. 1, TV component signal for the different scanning form of sending here by AV conversion switch 4, and by the SVGA signal R.G.B.H.V of outside input, digital scan format converter 5 is selected them and up conversion is sent into video decode and treatment circuit 6 after becoming the TV component signal of same scan format, carry out video decode and image processing and tristimulus signals are sent to the red, green, blue three primary colors video amplifier 20,21,22 respectively by it, drive red, green, blue three primary colors projection tube 13,14,15 again after amplifying respectively by them.Here after it may be noted that digital scan format converter 5 is converted to same scan format with the picture signal of different scanning form, in order to avoid the critical flicker frequency of human eye, its number of scanning lines should be selected enough scanning line densities.Simultaneously, sweep speed also should be near the highest picture signal of speed in the multiple media image signal, the image signals corresponding treatment circuit also should design according to the highest picture signal of sweep speed in the multiple medium, and conversion reduces picture quality later on through scan format can to avoid multiple media signal like this.
Still as Fig. 1, video decode and treatment circuit 6 will be sent to digit convergence circuit 8 and line-field sweep circuit 9 respectively through the new corresponding capable field sync signal of scan format behind digital scan format converter 5 up conversions, wherein digit convergence circuit 8 produces above-mentioned capable field sync signal and assembles current drives convergence correction coil 11 as benchmark, thereby realizes the three primary colors convergence; And line-field sweep circuit 9 is that benchmark produces row-field scanning current drives row-field scanning coil 12 with above-mentioned capable field sync signal, realizes row-field scanning, and line-field sweep circuit 9 also provides anode high voltage to red, green, blue three primary colors projection tube 13,14,15 simultaneously.
Still as Fig. 1, by bus mode the each several part circuit is carried out system's control by machine system controller 7 in the present embodiment.
It is pointed out that on the basis that does not break away from the utility model essence those of ordinary skill in the art can make various suitable distortion or replacement, still, all these distortion or replacement all should belong within the protection range of the present utility model.
Claims (4)
1, a kind of used circuit of the colored back projection type television set of cathode ray tube of supporting multiple scan format, comprise high-frequency tuner, intermediate frequency amplification and video demodulator, machine system controller, digit convergence circuit, line-field sweep circuit, it is characterized in that: described a kind of colored back projection type television set of cathode ray tube of multiple scan format of supporting also comprises following a kind of annexation: intermediate frequency amplifies and video demodulator is directly connecting the AV conversion switch, be used for vision signal, component signal are selected to switch, and the unified component signal that is converted to; This circuit is connecting acoustic processing and amplifying circuit again, also be directly connected to the digital scan format converter simultaneously, the different scanning format conversion that is used for multiple medium is with a kind of scan format, this circuit is directly connected to video decode and treatment circuit, be used for described be that the TV component signal of same scan format is decoded and image processing by the digital scan format converter transform, and tristimulus signals are sent to red, green, the blue three primary colors video amplifier respectively, drive the three primary colors projection tube again after amplifying respectively by them.
2, a kind of used circuit of the colored back projection type television set of cathode ray tube of supporting multiple scan format according to claim 1, it is characterized in that: described digital scan format converter is provided with one and selects circuit, be used for selecting to from the TV component signal of described AV conversion switch and from the SVGA signal R.G.B.H.V of outside.
3, a kind of used circuit of the colored back projection type television set of cathode ray tube of supporting multiple scan format according to claim 1, it is characterized in that: described digital scan format converter is provided with a up conversion circuit, is used for carrying out the TV component signal that up conversion is same scan format from the TV component signal of described AV conversion switch and from the SVGA signal RGBHV of outside.
4, a kind of used circuit of colored back projection type TV of supporting multiple scan format according to claim 1, it is characterized in that: described digital scan format converter is set to have the circuit of digitlization figure treatment technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01230881 CN2595108Y (en) | 2001-07-25 | 2001-07-25 | Cathode-ray tube rear-projection color Tv-set for supporting multiple scanning form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01230881 CN2595108Y (en) | 2001-07-25 | 2001-07-25 | Cathode-ray tube rear-projection color Tv-set for supporting multiple scanning form |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2595108Y true CN2595108Y (en) | 2003-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01230881 Expired - Fee Related CN2595108Y (en) | 2001-07-25 | 2001-07-25 | Cathode-ray tube rear-projection color Tv-set for supporting multiple scanning form |
Country Status (1)
| Country | Link |
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| CN (1) | CN2595108Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100493172C (en) * | 2004-03-23 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Method for scanning TV video frequency signal |
| CN100493173C (en) * | 2004-03-23 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Method for scanning TV video frequency signal |
-
2001
- 2001-07-25 CN CN 01230881 patent/CN2595108Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100493172C (en) * | 2004-03-23 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Method for scanning TV video frequency signal |
| CN100493173C (en) * | 2004-03-23 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Method for scanning TV video frequency signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20031224 |