CN1277407C - Method for adjusting non-linear image of CRT rear-projection television receiver - Google Patents
Method for adjusting non-linear image of CRT rear-projection television receiver Download PDFInfo
- Publication number
- CN1277407C CN1277407C CN 200310110864 CN200310110864A CN1277407C CN 1277407 C CN1277407 C CN 1277407C CN 200310110864 CN200310110864 CN 200310110864 CN 200310110864 A CN200310110864 A CN 200310110864A CN 1277407 C CN1277407 C CN 1277407C
- Authority
- CN
- China
- Prior art keywords
- linear
- scanning
- nonlinear
- crt
- projection television
- 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.)
- Expired - Fee Related
Links
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
The present invention relates to a method for adjusting a non-linear image of a CRT rear-projection television, which realizes the non-linear change of the image by non-linear convergence scanning. The non-linear convergence scanning is realized according to the method comprising the following procedures: a red, green and blue convergence line/field scanning drive circuit of the rear-projection television generates non-linear electric current; the non-linear electric current generates non-linear magnetic fields in deflection coils of three monochromatic CRTs; each non-linear magnetic field causes a CRT electron beam to generate corresponding non-linear horizontal/ vertical scanning to realize the non-linear change of the image. The present invention has the advantage of saving cost because non-linear convergence scanning directly using an original convergence scanning circuit of the rear-projection television instead of a professional digital processing chip. Meanwhile, the present invention has higher image definition than before and favorable motion image effect because the present invention carries out non-linear convergence scanning to each control scanning zone instead of carrying out digital sampling.
Description
[technical field]
The present invention relates to CRT rear-projection TV set field, refer in particular to a kind of in order to adjust the method for CRT rear-projection TV set nonlinear images.
[background technology]
Existing cathode ray tube back projection television has two kinds of screen proportions: 4: 3 and 16: 9.Simultaneously our the signal proportion form that can see also has two kinds: 4: 3 (for example: PAL, TSC-system formula analog video signal) and 16: 9 (for example: HDTV 1080I high-definition signal), will occur following several situation like this:
A: vision signal of watching 4: 3 all over the screen on 16: 9 screen;
B: vision signal of watching 16: 9 all over the screen on 4: 3 screen;
C: vision signal of watching 4: 3 all over the screen on 4: 3 screen:
D: vision signal of watching 16: 9 all over the screen on 16: 9 screen.
For two kinds of situations of above-mentioned C, D, the image that we see is identical with the practical video signal, just vision signal do not have distortion but 1: 1 reproduction on screen; The anamorphose of then seeing for two kinds of situations of A, B, the object in A situation hypograph becomes very wide, and the object in B situation hypograph becomes very narrow.
In order to improve the above-mentioned deformation effect of image when all over the screen, just need carry out nonlinear transformation to image.Because when spectators see TV generally speaking to the attentiveness of middle section much larger than attentiveness to the zone, image border, so at the image under above-mentioned A, the B situation, can adopt the mode of nonlinear transformation and guarantee that as far as possible the distortion of center Screen area image is smaller, the fringe region distortion is big.Above-mentioned nonlinear transformation all is to obtain after by the picture signal digital processing element of television set laggard line number word algorithm being handled in image digitazation basically at present, yet this way need be used expensive digital processing chip, and because image is carried out digital sampling, so the effect of image definition after the conversion and moving image all is affected.
[summary of the invention]
The object of the present invention is to provide a kind of cost lower and have a method of the adjustment CRT rear-projection TV set nonlinear images of better images definition.
The object of the present invention is achieved like this: the method for this a kind of CRT of adjustment back projection television nonlinear images is: assemble row/field scan drive circuit and produce non-linear current under the control of CPU, this non-linear current produces non-linear magnetic field in the deflecting coil of three CRT monochromatic projection pipes, this non-linear magnetic field makes the CRT electron beam produce corresponding non-linear horizontal/vertical scanning, thereby makes image realize nonlinear transformation.
Described nonlinear scanning is regional nonlinear scanning.
Described nonlinear scanning is that nonlinear scanning is carried out in the some independent scan control zone of full screen.
Described nonlinear scanning is that nonlinear scanning is carried out in the independent scan control zone in the middle of the screen.
Compared with prior art, the present invention has following advantage: owing to be directly to utilize the original convergence scanning circuit of rear-projection TV set, and saved professional digital processing chip, so can save cost; Simultaneously,, but non-linear convergence scanning is carried out in each gated sweep zone, so image definition is better and have a good moving image effect because it does not carry out digital sample.
[description of drawings]
Fig. 1 is the circuit block diagram of the method for a kind of CRT of adjustment rear-projection TV set of the present invention nonlinear images.
[embodiment]
See also Fig. 1, a kind of method of adjusting CRT rear-projection TV set nonlinear images of the present invention is to utilize the original convergence scanning circuit of CRT rear-projection, reaches the effect of image non-linear conversion by zonal nonlinear scanning.This CRT rear-projection TV set has redness, green and blue three CRT monochromatic projection pipes, and it has deflecting coil respectively, and this deflecting coil produces controlling magnetic field, controls the level and the vertical scanning characteristic of CRT electron beam with this.This each deflecting coil is controlled by red, the green and blue row/field scan drive circuit of assembling respectively.Should adopt existing chip for driving by each convergence row/field-scanning circuit, as Pioneer Electronic Corp.'s model is the chip of CM0021, this chip can have may command row (field) electric current at 9 (10) control point in each row (field) cycle generation, by controlling this 9 (10) individual row (field) Current Control point, can go up at every row (field) and produce any waveform, such as linear waveforms such as dc waveform, sawtooth waveforms waveforms, also can produce 2 times or the nonlinear waveform of higher power time.Should each convergence row/field scan drive circuit be to be controlled by control bus by existing C PU, this CPU also be a prior art, and its need adopt different logics to get final product at different television circuit schemes.
This nonlinear scanning realizes in the following way: assemble row/field scan drive circuit and produce non-linear current, this non-linear current produces non-linear magnetic field in the deflecting coil of three CRT monochromatic projection pipes, this non-linear magnetic field makes the CRT electron beam produce corresponding non-linear horizontal/vertical scanning, thereby makes image realize nonlinear transformation.
In the convergence sweeping scheme of this implementation method, horizontal direction has 9 scan control zones, vertical direction has 10 scan control zones, thereby make full screen have 90 zones to assemble scan control, and because these 90 scan control zones are separate, so can be easier to the controlled point in these this control areas is carried out the nonlinear scanning adjustment.Simultaneously at spectators to the attentiveness of television image central area much larger than attentiveness, so can only carry out non-linear convergence scanning to the control area in the middle of the screen to the zone, image border.Because the present invention only utilizes the non-linear convergence scanning of original convergence scan drive circuit, and saved proprietary digital processing chip, so reduced cost, simultaneously because it carries out nonlinear scanning to the controlled point in the control area, rather than the employing digital sampling, so the definition of image and the effect of moving image have been guaranteed.
Claims (4)
1. method of adjusting CRT back projection television nonlinear images, it is characterized in that: assemble row/field scan drive circuit and under the control of CPU, produce non-linear current, this non-linear current produces non-linear magnetic field in the deflecting coil of three CRT monochromatic projection pipes, this non-linear magnetic field makes the CRT electron beam produce corresponding non-linear horizontal/vertical scanning, thereby makes image realize nonlinear transformation.
2. a kind of method of adjusting CRT back projection television nonlinear images as claimed in claim 1 is characterized in that: described nonlinear scanning is regional nonlinear scanning.
3. a kind of method of adjusting CRT back projection television nonlinear images as claimed in claim 1 is characterized in that: described nonlinear scanning is that nonlinear scanning is carried out in the some independent scan control zone of full screen.
4. a kind of method of adjusting CRT back projection television nonlinear images as claimed in claim 3 is characterized in that: described nonlinear scanning is that nonlinear scanning is carried out in the independent scan control zone in the middle of the screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110864 CN1277407C (en) | 2003-10-31 | 2003-10-31 | Method for adjusting non-linear image of CRT rear-projection television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110864 CN1277407C (en) | 2003-10-31 | 2003-10-31 | Method for adjusting non-linear image of CRT rear-projection television receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1612602A CN1612602A (en) | 2005-05-04 |
| CN1277407C true CN1277407C (en) | 2006-09-27 |
Family
ID=34759252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310110864 Expired - Fee Related CN1277407C (en) | 2003-10-31 | 2003-10-31 | Method for adjusting non-linear image of CRT rear-projection television receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1277407C (en) |
-
2003
- 2003-10-31 CN CN 200310110864 patent/CN1277407C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1612602A (en) | 2005-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1277407C (en) | Method for adjusting non-linear image of CRT rear-projection television receiver | |
| US7064791B2 (en) | Display apparatus having format converter | |
| EP0714200B1 (en) | High definition television receiver | |
| CN101253767A (en) | Multi-standard vertical scan CRT system | |
| US4954901A (en) | Television receiver with two electron beams simultaneously scanning along respective verticaly spaced apart lines | |
| CN1751523A (en) | Processing signals for a color sequential display | |
| US5523789A (en) | High definition television monitor for displaying video images reproduced from normal standard video signals | |
| CN2676532Y (en) | Compatible receiver for high-definition digital television | |
| CN2728137Y (en) | 100Hz line-by-line scanning CRT back projection television set | |
| CN1165156C (en) | Adaptable raster distortion correction system for multiple horizontal scanning frequencies | |
| CN2595108Y (en) | Cathode-ray tube rear-projection color Tv-set for supporting multiple scanning form | |
| US20070262918A1 (en) | Video displaying apparatus and method thereof | |
| CN2691194Y (en) | Dynamic focusing circuit saitable for multiple display modes | |
| CN201247576Y (en) | Drive circuit for flat black and white display | |
| CN200950624Y (en) | Ultrathin color television set | |
| US6667588B1 (en) | Multi standard television display | |
| CN2733776Y (en) | Circuit displaying image of 16:9 format on terminal of 4:3 format | |
| CN1057185C (en) | Image convergence adjuster for colour projector | |
| CN2580711Y (en) | Device for calibrating screen brightness homogeneity of cathode-ray tube projection system | |
| US5621276A (en) | Cathode ray tube | |
| CN2694659Y (en) | Cathode-ray tube projection TV scanning velocity modulation circuit | |
| CN2531523Y (en) | Anti-burning device for CRT screen | |
| Huqiang et al. | 32.4: New Driving Scheme for the Camel CRT | |
| JPH0430792B2 (en) | ||
| US6570625B1 (en) | Display apparatus and display method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20060927 Termination date: 20111031 |