Circuit for eliminating pillow-shape distortion of colour TV set
A technology for pincushion distortion and TV sets, which is applied in the field of TV sets, can solve problems such as pincushion distortion and complexity, and achieve the effects of easy implementation, resolution of image distortion, and simple circuit structure.
Active Publication Date: 2009-10-21
HAIER GRP CORP +2
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Problems solved by technology
[0008] Although there are some methods and circuits for solving pincushion distortion, most of them are relatively complicated and cannot effectively solve the problem of pincushion distortion of TV images.
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[0019] figure 1 and figure 2 Respectively, the PWM EW signal generating circuit and the signal amplifying circuit of the embodiment of the present invention, refer to figure 1 and figure 2 The invention relates to a circuit for eliminating the pincushion distortion of a color TV set, including a PWM EW signal generating circuit and a PWM EW signal amplifying circuit.
[0020] refer to figure 1 : The PWM EW signal generation circuit includes a mirror current source circuit 1 and a signal modulation circuit 2. The mirror current source circuit 1 mainly includes two transistors Q101 and Q104, and three resistors R2, R3, R4, wherein R2=R4, and the mirror current source circuit can provide a stable parabolic output.
[0021] The signal modulation circuit 2 mainly includes a transistor Q103 and two diodes. The triode Q103 modulates the parabolic wave with the PWM signal applied to the base to generate a PWM EW signal whose amplitude can be controlled and changed.
[0022] Th...
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The invention discloses a circuit for eliminating the pincushion distortion of a color television set, the circuit includes a PWM signal generating circuit and a PWM EW signal amplifying circuit, and the signal amplifying circuit mainly includes an EW signal amplifier connected to the rear end of a line-field deflection processor , the PWM EW signal generation circuit includes a mirror current source circuit and a signal modulation circuit, the mirror current source circuit can provide a stable parabolic output, the signal modulation circuit mainly includes a triode and two diodes, the The triode uses the PWM signal added to the base to modulate the parabolic wave to generate a PWM EW signal whose amplitude can be controlled and changed. The signal is amplified by the EW signal amplifier to make the deflection current larger when the electron beam scans the four corners of the picture tube. The deflection coil generates a large magnetic field to control the large-scale scanning of the electron beam, so as to correct the distortion on the image scanning.
Description
technical field [0001] The invention relates to the technical field of televisions, in particular to a circuit for eliminating pincushion distortion of color televisions. Background technique [0002] TV image distortion is an important index to measure the performance of TV. When the large-screen CRT TV controls the electron beam scanning and imaging by the deflection coil of the picture tube, because of the physical characteristics of the picture tube and the coil itself (it can only meet the 110-degree Scanning range) is easy to cause the image to expand outward at the four corners of the picture tube, showing geometric deformation, also known as pincushion distortion. [0003] Pincushion distortion is an inherent defect of CRT monitors, which must be corrected by a specific circuit inside the monitor. The image warp is like a pincushion shape, with all sides curved inwards, hence the name. It results from the production of CRT displays with a surface that is flatter th...
Claims
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IPC IPC(8): H04N3/23
Inventor 刘强翟翌立陈宜龙杨立房
Owner HAIER GRP CORP