发明名称 |
Dynamic focusing circuit, picture display device and method of generating a dynamic focusing voltage |
摘要 |
The invention relates to a dynamic focusing circuit (100) for generating a line-frequency dynamic focusing voltage (Vl1) which can be used to control a DAF section (220) of a cathode ray tube (CRT). The dynamic focusing circuit (100) receives a line deflection current (Id1) and transforms and integrates said current so as to obtain the line-frequency focusing voltage (Vl1). The dynamic focusing circuit also generates a further line-frequency focusing voltage (Vl2) and adds this voltage to the line-frequency focusing voltage (Vl1). By applying the invention, the line-frequency focusing voltage (Vl1) is suitable for dynamically focusing the electron beam (201) in a cathode ray tube (CRT) with a relatively large deflection angle of, for example, 120°. It has both a sufficient amplitude and a suitable shape, for example, a bathtub shape.
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申请公布号 |
US2003001527(A1) |
申请公布日期 |
2003.01.02 |
申请号 |
US20020180401 |
申请日期 |
2002.06.26 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
SLUYTERMAN ALBERTUS AEMILIUS SEYNO |
分类号 |
G09G1/00;H04N3/26;(IPC1-7):H01J29/70 |
主分类号 |
G09G1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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