CN100553288C - A kind of circuit of eliminating pillow-shape distortion of colour TV set - Google Patents
A kind of circuit of eliminating pillow-shape distortion of colour TV set Download PDFInfo
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- CN100553288C CN100553288C CNB2005101277525A CN200510127752A CN100553288C CN 100553288 C CN100553288 C CN 100553288C CN B2005101277525 A CNB2005101277525 A CN B2005101277525A CN 200510127752 A CN200510127752 A CN 200510127752A CN 100553288 C CN100553288 C CN 100553288C
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Abstract
The invention discloses a kind of circuit of eliminating pillow-shape distortion of colour TV set, this circuit comprises pwm signal generation circuit and PWM EW signal amplification circuit, described signal amplification circuit, mainly comprise the EW signal amplifier that connects the field deflection processor rear end of being expert at, described PWM EW signal generating circuit comprises an image current source circuit and a signal modulation circuit, this image current source circuit can provide stable parabolic shape output, described signal modulation circuit mainly comprises a triode and two diodes, the pwm signal that described triode utilization is added in base stage is modulated parabolic shape, the generation amplitude can controlled variation PWM EW signal, this signal amplifies through the EW signal amplifier, make deflection current big promotion deflecting coil of electrorheological when four jiaos in electron beam scanning picture tube produce the large area scanning of very big magnetic field controlling electron beam, correct distortion on the scanning of image with this.
Description
Technical field
The present invention relates to technical field of television sets, relate in particular to a kind of circuit of eliminating pillow-shape distortion of colour TV set.
Background technology
The television image distortion is an important indicator weighing the television set performance, large-screen CRT TV is when picture tube scanning yoke controlling electron beam scanning imagery, (can only satisfy the sweep limitss of 110 degree) because the physical characteristic of picture tube and coil itself and cause easily image in four bights of picture tube to extending out out the distortion that presents on how much, be also referred to as pincushion distortion.
Pincushion distortion is the intrinsic defective of CRT monitor, must could correct by the specific circuit of display interior.Scalloping is just as pincushion, and all limits all curve inwardly, and gain the name thus.It causes than the spherical naturally more flat surface production CRT display screen of reality by using.Screen is flat more, and this effect is just obvious more, just needs more pincushion distortion to correct.Television set is adjusted television image geometric distortion usually by the following method at present:
For low-grade machine: owing to only possess basic calibration function, and these calibration functions realize by resolution element, use adjustable resistance to adjust.
For middle-grade machine: possess basic calibration function and Premium Features, use integrated circuit to finish correction, therefore can adjust by the I2C bus.
For more high-grade machine: possess the above and adjust circuit, may also have meticulousr adjustment simultaneously, proofread and correct as M etc.
China's publication number is that CN1433218A discloses a kind of deflection current modulation circuit, mainly comprise deflecting apparatus, signal source, switching semiconductor, flyback capacitor, modulating input signal source, the modulated current that this modulation circuit produces provides the edge pillow distortion equalizing in Dong-Xi modulator.
Though the method and the circuit that have at present some to solve pincushion distortions, more complicated mostly, problem that can not the pincushion distortion of effectively solution television image.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective a kind of circuit of eliminating pillow-shape distortion of colour TV set is provided.
For achieving the above object, the present invention adopts following technical scheme:
The circuit of elimination pillow-shape distortion of colour TV set of the present invention, comprise horizontal deflection transformer (T401) and deflecting coil, it is characterized in that, comprise pulse-width modulation PWM EW signal generating circuit and PWM EW signal amplification circuit, described PWM EW signal generating circuit, comprise an image current source circuit and a signal modulation circuit, be connected with described PWM EW signal amplification circuit, described signal amplification circuit, comprise the EW signal amplifier of the rear end that connects the field deflection processor of being expert at, be connected with described deflecting coil; The PWM EW signal of modulating that described PWM EW signal generating circuit produces is after described signal amplification circuit amplifies, and the deflection current that outputs to described deflecting coil with described horizontal deflection transformer (T401) superposes, and outputs to described deflecting coil.
The circuit that this eliminates pillow-shape distortion of colour TV set is characterized in that described signal amplification circuit also comprises two electric capacity, and described electric capacity is line retrace electric capacity, utilizes its charge-discharge characteristic, produces the voltage that promotes the line output transformer concussion.
The circuit that this eliminates pillow-shape distortion of colour TV set is characterized in that described signal amplification circuit also comprises inductance, and described inductance is used for the horizontal pulse that filtering row circuit produces for pillow school coil.
The circuit that this eliminates pillow-shape distortion of colour TV set is characterized in that described image current source circuit comprises two triodes and three resistance, and this image current source circuit provides stable parabolic shape output.
This eliminates the circuit of pillow-shape distortion of colour TV set, it is characterized in that, described signal modulation circuit mainly comprises a triode and two diodes, and the pwm signal that described triode utilization is added in base stage is modulated parabolic shape, the PWM EW signal of the controlled variation of generation amplitude.
The present invention is by the application of PWM EW signal on color television set, and simple enforcement of circuit structure can also well solve the problem of TV images distortion easily.
Description of drawings
Fig. 1 is an embodiment of the invention PEM EW signal generating circuit
Fig. 2 is an embodiment of the invention PEM EW signal amplification circuit
Embodiment
Fig. 1 and Fig. 2 are respectively embodiment of the invention PWM EW signal generating circuit and signal amplification circuit, and with reference to figure 1 and Fig. 2: the circuit that this eliminates pillow-shape distortion of colour TV set comprises PWM EW signal generating circuit and PWM EW signal amplification circuit.
Comprise an image current source circuit 1 and a signal modulation circuit 2 with reference to figure 1:PWM EW signal generating circuit.Described image current source circuit 1 mainly comprises two triode Q101 and Q104 and 3 resistance R 2, R3, R4, R2=R4 wherein, and this image current source circuit can provide stable parabolic shape output.
Described signal modulation circuit 2 mainly comprises a triode Q103 and two diodes.Described triode Q103 utilizes the pwm signal that is added in base stage that parabolic shape is modulated, the PWM EW signal that the generation amplitude can controlled variation.
The cardinal principle of PWM EW signal generating circuit: the image current source circuit of being made up of triode Q101 and Q104 and three resistance R 2, R3 and R4 can provide stable parabolic shape output, the temperature compensation function that this image current source circuit itself has, can avoid because variations in temperature causes the drift of the operating state of device, to reduce the influence of parabolic shape change to visual rectification effect, 9V voltage is used for promoting the DC potential of entire circuit work in the circuit.Q103 utilizes the pwm signal be added in base stage to come parabolic shape is modulated, the PWM EW signal that the generation amplitude can controlled variation.
With reference to figure 2: this circuit is main to be characterised in that, the be expert at rear end of field deflection processor has increased a signal amplifier, in the original circuit of television set, the amplitude that is produced the EW correction signal by row field deflection processor can not meet the demands, be expert at after field deflection processor rear end adds amplifier, the EW correction signal is after amplifier amplifies, can provide more abundant deflection current to promote deflecting coil work to deflecting coil, be superimposed upon on the deflection current and correct, make the electric current that is added on the deflecting coil along with suitable variation is also carried out in the variation of electron beam scanning angle thereupon, correct defective on the deflection scanning with this.
The cardinal principle of PWM EW signal amplification circuit: the horizontal deflection signal of partly sending here from small-signal (Horizontal deflection signal) promotes triode (V403) through the amplification of horizontal deflection transformer T401 and makes it to be operated on off state, is producing the scanning that the line sawtooth electric current is delivered to controlling electron beam on the deflecting coil of picture tube under the acting in conjunction of diode VD409 and VD407.The EW signal that produces from the row-field scanning processor is superimposed upon line sawtooth adjustment through after the amplification of amplifier by the L401 inductance.Make the large area scanning of the very big magnetic field controlling electron beam of the generation of deflection current big promotion deflecting coil of electrorheological when four jiaos in electron beam scanning picture tube, correct distortion on the scanning of image with this.In the circuit, capacitor C 414 and C415 are line retrace electric capacity, utilize the charge-discharge characteristic of electric capacity, produce the voltage that promotes the line output transformer concussion.Inductance L 401 is used for the horizontal pulse that filtering row circuit produces for pillow school coil, the PEM EW signal of low frequency is introduced being carried in the horizontal pulse simultaneously, and C428 is a filter capacitor.
This eliminates the circuit of pillow-shape distortion of colour TV set, but produce modulation (PWM) EW signal and output to deflecting coil through the amplification of EW signal amplifier, make deflection current big promotion deflecting coil of electrorheological when four jiaos in electron beam scanning picture tube produce the large area scanning of very big magnetic field controlling electron beam, correct distortion on the scanning of image with this, effectively solve the problem of color television set image pincushion distortion.
Though the present invention with preferred embodiment openly as above; right its is not in order to limiting the present invention, anyly is familiar with this operator, without departing from the spirit and scope of the invention; when doing a little change and retouching, the change of doing still belongs within the accompanying Claim protection range of the present invention with retouching.
Claims (6)
1, a kind of circuit of eliminating pillow-shape distortion of colour TV set, comprise horizontal deflection transformer (T401) and deflecting coil, it is characterized in that, also comprise PWM EW signal generating circuit and PWM EW signal amplification circuit, described PWM EW signal generating circuit, comprise an image current source circuit and a signal modulation circuit, be connected with described PWM EW signal amplification circuit, described signal amplification circuit, mainly comprise the EW signal amplifier of the rear end that connects the field deflection processor of being expert at, be connected with described deflecting coil; The PWM EW signal of modulating that described PWM EW signal generating circuit produces is after described signal amplification circuit amplifies, and the deflection current that outputs to described deflecting coil with described horizontal deflection transformer (T401) superposes, and outputs to described deflecting coil.
2, the circuit of elimination pillow-shape distortion of colour TV set according to claim 1, it is characterized in that, described signal amplification circuit also comprises electric capacity (C414 and C415), described electric capacity (C414 and C415) is line retrace electric capacity, utilize its charge-discharge characteristic, produce the voltage that promotes the line output transformer concussion.
3, the circuit of elimination pillow-shape distortion of colour TV set according to claim 1 is characterized in that, described signal amplification circuit also comprises inductance (L401), and described inductance is used for the horizontal pulse that filtering row circuit produces for pillow school coil.
4, the circuit of elimination pillow-shape distortion of colour TV set according to claim 1, it is characterized in that, described image current source circuit comprises two triodes (Q101, Q104) and three resistance R 2, R3, R4, and this image current source circuit provides stable parabolic shape output.
5, the circuit of elimination pillow-shape distortion of colour TV set according to claim 1, it is characterized in that, described signal modulation circuit mainly comprises a triode (Q103) and two diodes, described triode (Q103) utilization is added in the pwm signal of base stage and parabolic shape is modulated the PWM EW signal of the controlled variation of generation amplitude.
6, the circuit of elimination pillow-shape distortion of colour TV set according to claim 4 is characterized in that, described resistance R 2=R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101277525A CN100553288C (en) | 2005-12-06 | 2005-12-06 | A kind of circuit of eliminating pillow-shape distortion of colour TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101277525A CN100553288C (en) | 2005-12-06 | 2005-12-06 | A kind of circuit of eliminating pillow-shape distortion of colour TV set |
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| Publication Number | Publication Date |
|---|---|
| CN1980315A CN1980315A (en) | 2007-06-13 |
| CN100553288C true CN100553288C (en) | 2009-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005101277525A Active CN100553288C (en) | 2005-12-06 | 2005-12-06 | A kind of circuit of eliminating pillow-shape distortion of colour TV set |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0700199A2 (en) * | 1994-08-01 | 1996-03-06 | Kabushiki Kaisha Toshiba | Horizontal output circuit |
| CN1234162A (en) * | 1996-10-21 | 1999-11-03 | 汤姆森消费电子有限公司 | Pincushion control circuit |
| CN1474592A (en) * | 1995-11-21 | 2004-02-11 | ���µ�����ҵ��ʽ���� | Image distortion correcting device |
-
2005
- 2005-12-06 CN CNB2005101277525A patent/CN100553288C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0700199A2 (en) * | 1994-08-01 | 1996-03-06 | Kabushiki Kaisha Toshiba | Horizontal output circuit |
| CN1118962A (en) * | 1994-08-01 | 1996-03-20 | 东芝株式会社 | Line output circuit |
| CN1474592A (en) * | 1995-11-21 | 2004-02-11 | ���µ�����ҵ��ʽ���� | Image distortion correcting device |
| CN1234162A (en) * | 1996-10-21 | 1999-11-03 | 汤姆森消费电子有限公司 | Pincushion control circuit |
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| Publication number | Publication date |
|---|---|
| CN1980315A (en) | 2007-06-13 |
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Effective date of registration: 20170527 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Co-patentee after: Qingdao Haier Electric Appliance Co., Ltd. Patentee after: haier group corporation Co-patentee after: QINGDAO HAIER MULTI-MEDIA CO., LTD. Address before: 266101 Haier Industrial Park, 1 Haier Road, Shandong, Qingdao Co-patentee before: Qingdao Haier Electric Appliance Co., Ltd. Patentee before: haier group corporation |