CN2728137Y - 100Hz line-by-line scanning CRT back projection television set - Google Patents
100Hz line-by-line scanning CRT back projection television set Download PDFInfo
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- CN2728137Y CN2728137Y CNU2004200726000U CN200420072600U CN2728137Y CN 2728137 Y CN2728137 Y CN 2728137Y CN U2004200726000 U CNU2004200726000 U CN U2004200726000U CN 200420072600 U CN200420072600 U CN 200420072600U CN 2728137 Y CN2728137 Y CN 2728137Y
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Abstract
The utility model relates to a 100Hz line-by-line scanning CRT back projection television set, comprising a present back projection screen, a video portion and a power source. The 100Hz line-by-line scanning CRT back projection television set also comprises a digital signal processing module, a digital convergent signal processing module, a deflection coil and an optical system. The input component signals of TV, AV and DVD are digitally processed and converted into the line-by-line scanning Y/U/V signals of 60Hz, 75Hz and 100Hz. Meanwhile, the line frequency is improved to 48KHz. The output Y/U/V signals of the digital signal processing module are processed to output three based color signals of RGB through a special module processed by the signal of small line field, the previewing playing and the pillow correction. The image quality of the 100Hz line-by-line scanning CRT back projection television set is greatly improved. The utility model doesn't flicker in a large area or in lines. The image is fluent and fine.
Description
Technical field
The utility model relates to the Digital Television treatment technology, the 100Hz that particularly is suitable for big display terminal such as large-screen CRT TV, the CRT rear-projection TV rear-projection TV set of lining by line scan.
Background technology
In recent years, the technical development of domestic back projection colour TV is rapid.From first generation 50Hz interlacing scan rear-projection, a few years time, Chinese rear-projection just passed by second generation 100Hz interlacing scan, third generation 60Hz lines by line scan, the 4th generation 75Hz lines by line scan rear-projection road.Image quality realizes tremendous development, but for large-screen CRT rear-projection TV, especially 38 " above, above-mentioned product can not allow the consumer very satisfied, because screen is big more high more to eliminating the required field frequency of large-area flicker.
Because at present CRT TV, CRT monitor, CRT rear-projection TV adopt 31.25KHz, 33.75KHz or 38KHz line frequency, such line frequency can only realize that 100Hz interlacing scan or 60Hz, 75Hz, 85Hz line by line scan, and can not realize that 100Hz lines by line scan.When adopting 100Hz interlacing scan (doubly speed scanning) mode, row structure line is comparatively rough, influences viewing effect.
Before this, because the reason of technical elements, mainly be that the 100Hz required process information amount of lining by line scan is very big, the clock frequency of digital processing IC, storage IC is lower, scanning circuit poor work stability under 100Hz field frequency 48KHz line frequency; The bandwidth of final video amplifier is narrower; Also have problems such as deflecting coil deflection sensitivity, temperature rise difficulty overcome, therefore, 100Hz lines by line scan and is considered to realize.
At present, has only the 100Hz digital health care color monitor (patent No.: 02134295.4), it includes CRT, a row driving, video section, CPU and DSP unit, power supply, DSP unit wherein carries out digital processing to incoming video signal, convert thereof into and line by line scan or the doubly fast vision signal that scans, the vision signal of amplifying circuit is carried out preposition amplification, and row, field sync signal behind the control deflection processing circuit, response conversion, the control row drives finishes demonstration.What its adopted is 100Hz interlacing scan and 60Hz progressive scanning technology, and concerning the little flat-screen CRT TV of screen, sweep speed is brought up to per second 100 field picture, and scan line reaches 1250 lines, does not glimmer picture exquisiteness, smooth effect thereby reach image.This technology is applicable to 21 " TV of picture tube, but for large screen back projection, this technical scheme can't be eliminated interline flicker, and its row structure line is also obviously rough, can not realize picture exquisiteness, smooth effect.
Summary of the invention
Therefore, the purpose of this utility model provides a kind of 100Hz CRT rear-projection TV set of lining by line scan, and the picture quality of this rear-projection TV set improves greatly, has not both had large-area flicker, does not have interline flicker again, picture smoothness, exquisiteness.
The utility model is achieved in that
A kind of 100Hz CRT rear-projection TV set of lining by line scan comprises existing rear projection screen, and video section and power supply is characterized in that, this television set also includes digital signal processing module, digit convergence signal processing module, deflecting coil and optical system.
Specifically input TV, AV, DVD component signal are carried out digital processing (digital signal processing module is handled), convert 60Hz, 75Hz, the 100Hz Y/U/V signal of lining by line scan to, simultaneously line frequency is brought up to 48KHz; The Y/U/V signal of digital signal processing module output is handled through the special module that a row small-signal is handled, the school processing is put, rested the head on to previewing, output RGB tristimulus signals; Look to put and adopt the special use of high pressure broadband to look amplification module, guarantee image definition; Simultaneously, the convergence correction voltage signal that convergence yoke produces is transformed to current signal and is added on the convergence coil (Convergence Yoke) of projection tube, makes the distortion of picture obtain proofreading and correct.
The described 100Hz CRT rear-projection TV set of lining by line scan, it is looked and puts processing, adopts the special use of high pressure broadband to look amplification module, guarantees image definition;
And the described 100Hz CRT rear-projection TV set of lining by line scan uses convergence yoke, and the convergence correction voltage signal that this system produces is transformed to current signal and is added on the convergence coil (Convergence Yoke) of projection tube, makes the distortion of picture obtain proofreading and correct.
The described 100Hz CRT rear-projection TV set of lining by line scan, its digit convergence signal processing module includes osd generator, voltage controlled oscillator, programmable frequency divider and phase comparator, the external loop low pass filter of phase place relative error output becomes direct voltage after the phase-error pulse signal smoothing, import from the frequency of oscillation control input end, the frequency of oscillation of control voltage controlled oscillator, make it can work in the 48KHz line frequency, on the 100Hz field frequency.
The port of above-mentioned voltage controlled oscillator, it can pass through resistance, connects high-low level respectively, with the requirement of the high oscillation frequency that adapts to 48KHz line frequency needs.
Deflecting coil, its condition that satisfies 48Hz line frequency demand from the device aspect is that its work temperature rise is less than 60 ℃.
Power supply for adapting to the lifting of row, field frequencies range, is transformed existing power supply, and specific practice is as follows:
Because the lifting of line frequency, field frequency makes complete machine rated consumption power rise to the 260W scan power by 180W, maximum consumption power is more up to 320W.Former main power source can not be born, and therefore, the described 100Hz CRT rear-projection TV set of lining by line scan is changed to audio power amplifier power supply on the auxiliary power plate of assembling the power amplifier power supply by main power board, reduces the consumed power of main power source, promotes the auxiliary power power output plate simultaneously.
Simultaneously, supply harmonic inhibition index is satisfied in being improved to of above-mentioned power supply, and the auxiliary power plate increases a harmonic wave and suppresses inductance.
The described 100Hz CRT rear-projection TV set of lining by line scan, its optical system is digital lens assembly, it includes Fresnel lens, biconvex lens, adopts the surface reflection mirror simultaneously, makes that image definition, corner focus on, the whole-screen brightness uniformity is improved.
The described 100Hz CRT rear-projection TV set of lining by line scan adopts the jewel panel that drips, and preposition protection screen, and subsidiary wireless headset are particularly suitable for the dead of night and watch program or appreciate TV programme separately, satisfy the demand that numerous spectators watch TV programme at any time.
The described 100Hz CRT rear-projection TV set of lining by line scan, its picture processing path, adopt special broadband to hang down overshoot luminance delay circuit, this circuit makes the bandwidth of luminance delay line improve, overshoot reduces, can satisfy the processing requirements of picture quality well, particularly the image detail part can be shown well.
The 100Hz of the 48KHz line frequency CRT rear-projection TV of lining by line scan under TV (PAL/NTSC), AV (PAL/NTSC), DVD component input state, also has 60Hz, the 75Hz way of output of lining by line scan to select.Support 525P, 1080i (50Hz, 60Hz), multiple HDTV pattern of the inputs such as 720P, 1080P, support VGA (640*480), SVGA (800*600), the multiple VGA input signal of XGA (1024*768), can be used for multiple uses such as teaching, meeting, parlor.
The 100Hz described in the utility model CRT rear-projection TV set of lining by line scan, it moves under the 48KHz line frequency, make the CRT rear-projection TV, demonstration per second sweep speed is brought up to the progressive scanning picture of 100 field frequencies, image does not glimmer, image quality exquisiteness, smoothness, has eliminated the visual fatigue that human eye is watched easy generation for a long time.
Description of drawings
Fig. 1 is a system architecture diagram of the present utility model,
Fig. 2 is the utility model optical system configuration composition,
Fig. 3 is a digit convergence theory diagram of the present utility model,
Fig. 4 is a utility model small-signal plate structure block diagram,
Fig. 5 is that the utility model is assembled small-signal plate circuit diagram.
Embodiment
Fig. 1, Fig. 2 realize the line by line scan structural representation of CRT rear-projection of 100Hz.Comprise circuit, structure, several major parts of optical system.
The 100Hz that the utility model the is implemented CRT rear-projection color television set of lining by line scan, its movement circuit adopts input processor TDA9321, shows treatment circuit TDA9332, video amplifier TDA6120Q, Digital Television Sound Processor Unit TDA9875A etc.; Digital signal panel adopts PW1235 special digital signal processing IC, YUV, various frequency HDTV signal (28.25KHz, 31.5KHz, 33.75KHz, 45KHz), the VGA (VGA/SVG/AXGA) of the 15.625KHz that TV, AV, DVD input signal are converted to, and unification is the YUV signal of 48KHz line frequency, under TV, AV, DVD input signal pattern, can carry out 60Hz, 75Hz, the 100Hz field frequency conversion of lining by line scan, be fixed as 60Hz under HDTV, the VGA input pattern and line by line scan.Wherein machine core board also comprises public passage, sound channel, vision signal treatment channel, AV/TV commutation circuit, reaches remote control circuit etc.
Video amplifies employing high voltage broadband Wide, and (100Vpp, application-specific integrated circuit 30MHz) is as TDA6120Q.Can work in the line-field sweep circuit of 100Hz field frequency 48KHz line frequency.
Digital lens assembly of the present utility model; the numeral lens assembly includes Fresnel lens, biconvex lens; adopt the surface reflection mirror simultaneously; the preposition protection screen of band black surround of novel fashion; add the cooling fluid cooling of adopting original creation, image definition, corner focusing, whole-screen brightness uniformity are improved.
Accompanying drawing 3 digit convergence theory diagrams, from principle, because 3 picture tubes of CRT projection TV separate on the geometric position, and the wavelength difference of 3 kinds of colors, therefore, each pixel on the piece image arrives projection screen with different angles, different light path, and in order to guarantee the focusing registration of each point on the screen, the magnetic field energy that requires deflecting coil to produce in projection TV reaches the purpose of correcting image distorsion; In addition, because that the material that deflecting coil uses can not be accomplished is evenly absolute, also can exists between mutually perpendicular capable field deflection coil and crosstalk etc.These factors have all caused the distortion of picture, and the distortion of diverse location all has nothing in common with each other again on different colours and the screen.Therefore, requiring in the CRT rear-projection TV has special distortion Adjustment System, Here it is digital convergence system.
Digital convergence system will be proofreaied and correct respectively the distortion of three kinds of colors, every kind of color has level, vertical two yawing moments again, therefore, 6 tunnel correction signals need take place in it, and they are respectively red vertical (RV), red level (RH), green vertical (GV), green level (GH), blue vertical (BV), blue level (BH) correction signal.The correction signal that convergence yoke produces is fully synchronous with the vision signal of input, by the isolated row of vision signal, field sync signal (HS, VS) to introduce in the convergence yoke as phase-locked, sequential is distributed and the baseband signal of osd generator, wherein line synchronizing signal is also as the reference signal of phase-locked loop.The core of whole digital convergence system is full digital processing convergence correction control integrated circuit CM0021AF.Inside is made up of voltage controlled oscillator (VCO), programmable frequency divider and phase comparator, one of them pin (PDOUT48 pin) is a phase place relative error output, external loop low pass filter becomes direct voltage after the phase-error pulse signal smoothing, from frequency of oscillation control input end VCOIN (47 pin) input, the frequency of oscillation of control voltage controlled oscillator.Pin VCOSEL (43 pin) port is selected the frequency range of voltage controlled oscillator, and this pin can pass through resistance as required, connects high-low level respectively, to adapt to the requirement of 48khz line frequency needs high oscillation frequency.And developed special-purpose convergence software, adapt to the needs of 60HZ, 75HZ, 100Hz progressive scanning mode respectively.
Assemble small-signal plate circuit diagram then as shown in Figure 5.
Accompanying drawing 4 is small-signal plate theory diagrams of row-field scanning, adopts the frequency synthesis tuner, and microprocessor is not exported the tuning voltage of simulation and supplied with tuner, but directly by I
2The C bus transmissioning data, tuning in tuner inside through frequency synthesis, select corresponding radio station.
Filtering Processing has adopted the digital dynamic comb filter of TDA9181, can support PAL-B, G, H, D, I, M and NTSC-M standard to carry out comb filtering and separate, and has reduced the light tone influence of string mutually effectively.
The 50 pin output U signal of IC1001 (TDA9321), 49 pin output Y-signal, 51 pin output V signal, Y, U, V signal after IC1001 handles enter times andante and definition and improve circuit.The image definition improvement that the utility model adopts is made up of TDA9178 and peripheral circuit, and TDA9178 adopts in the ranks to compare, and the mode of statistics is improved the integrated circuit of picture quality between.Signal to input carries out luminance vector processing (histogram processing, variable r control, black level extend), chrominance vector handles (comprising green enhancing, blue extension, flesh correction, saturation correction), frequency spectrum processing (comprise brightness moment improve, colourity moment improves, intelligent details strengthens), and the A/D conversion and the I of 3 road video input signals
2The total line traffic control of C, function treatment such as adjustable luminance delay, standard identification, pattern recognition.
YUV signal after definition is improved processing of circuit enters digital signal panel and carries out frequency-conversion processing line by line, under TV, AV, DVD input state, and the exportable 60Hz of digital signal panel, 75Hz, 100Hz progressive-scan signal; Under HDTV, VGA input state, the YUV signal that exportable 60Hz lines by line scan.The YUV signal line frequency of digital signal panel output is fixed as 48KHz.
The demonstration treatment circuit is made up of TDA9332 (IC1301) and peripheral circuit, comprises the selection of picture signal and show handling, reach synchronously the processing of deflection small-signal, geometry distrotion correction, D/A conversion and I
2C bus interface etc.
The selection of picture signal and demonstration are handled and comprised: RGB-YUV, YUV select, black level extends and colourity control, primary colours matrix, contrast control, primary colours selection, white peak and brilliance control, peak value amplitude limit and beam electronic current are controlled, secretly balance is regulated automatically, blue level extends and output is amplified.TDA9332 controls by iic bus, can realize the parameter adjustment of picture geometry.Deliver to 1,7 pin of a power amplifier output integration block IC3501 (STV9379F) through 1,2 pin of conversion terminal P3006 from forward and reverse sawtooth current of 1,2 pin output through the field frequency sawtooth waveforms of TDA9332 demonstration treatment circuit generation.
Claims (9)
1, a kind of 100Hz CRT rear-projection TV set of lining by line scan comprises existing rear projection screen, and video section and power supply is characterized in that, this television set also includes digital signal processing module, digit convergence signal processing module, deflecting coil and optical system.
2, the 100Hz as claimed in claim 1 CRT rear-projection TV set of lining by line scan, it is special to be that it is looked and to put processing, adopts the special use of high pressure broadband to look amplification module, guarantees image definition; And this television set uses convergence yoke, and the convergence correction voltage signal that this system produces is transformed to the convergence coil that current signal is added to projection tube.
3, the 100Hz as claimed in claim 1 CRT rear-projection TV set of lining by line scan, its special its digit convergence signal processing module that is includes osd generator, voltage controlled oscillator, programmable frequency divider and phase comparator, the external loop low pass filter of phase place relative error output becomes direct voltage after the phase-error pulse signal smoothing, imports from the frequency of oscillation control input end.
4, the 100Hz as claimed in claim 3 CRT rear-projection TV set of lining by line scan, its special port that is above-mentioned voltage controlled oscillator, it can pass through resistance, connects high-low level respectively.
5, the 100Hz as claimed in claim 1 CRT rear-projection TV set of lining by line scan, its special this television set that is is changed to the audio power amplifier power supply on the auxiliary power plate of assembling the power amplifier power supply by main power board.
6, the 100Hz as claimed in claim 5 CRT rear-projection TV set of lining by line scan, it is special to be that auxiliary power plate increases a harmonic wave and suppresses inductance.
7, the 100Hz as claimed in claim 1 CRT rear-projection TV set of lining by line scan, its special its optical system that is is digital lens assembly, it includes Fei Nie lens, biconvex lens again, adopts the surface reflection mirror simultaneously.
8, the 100Hz as claimed in claim 1 CRT rear-projection TV set of lining by line scan, it is special to be to adopt the jewel panel that drips, preposition protection screen, and subsidiary wireless headset.
9, the 100Hz as claimed in claim 1 CRT rear-projection TV set of lining by line scan, its special its picture processing path that is adopts special broadband to hang down overshoot luminance delay circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200726000U CN2728137Y (en) | 2004-08-13 | 2004-08-13 | 100Hz line-by-line scanning CRT back projection television set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200726000U CN2728137Y (en) | 2004-08-13 | 2004-08-13 | 100Hz line-by-line scanning CRT back projection television set |
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| Publication Number | Publication Date |
|---|---|
| CN2728137Y true CN2728137Y (en) | 2005-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2004200726000U Expired - Fee Related CN2728137Y (en) | 2004-08-13 | 2004-08-13 | 100Hz line-by-line scanning CRT back projection television set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100566376C (en) * | 2005-12-29 | 2009-12-02 | 康佳集团股份有限公司 | A kind of circuit that improves the cathode ray tube television receiver high-pressure line scanning output power |
-
2004
- 2004-08-13 CN CNU2004200726000U patent/CN2728137Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100566376C (en) * | 2005-12-29 | 2009-12-02 | 康佳集团股份有限公司 | A kind of circuit that improves the cathode ray tube television receiver high-pressure line scanning output power |
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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: 20050921 Termination date: 20100813 |