[1] Gu Wei, Yang Minyi, Zhao Hongping, Yang Xiaowei, et al. S-correction in very slim CRTs [J]. Journal of Southeast University (English Edition), 2005, 21 (3): 272-276. [doi:10.3969/j.issn.1003-7985.2005.03.006]
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S-correction in very slim CRTs(
)
超薄CRT的S校正
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 21
- Issue:
- 2005 3
- Page:
- 272-276
- Research Field:
- Electronic Science and Engineering
- Publishing date:
- 2005-09-30
Info
- Title:
- S-correction in very slim CRTs
- 超薄CRT的S校正
- Author(s):
- Gu Wei; Yang Minyi; Zhao Hongping; Yang Xiaowei; Lei Wei
- Department of Electronic Engineering, Southeast University, Nanjing 210096, China
- PACS:
- TN141
- DOI:
- 10.3969/j.issn.1003-7985.2005.03.006
- Abstract:
- To correct the S-distortion in large deflection angle cathode-ray tubes(CRTs), ideal deflection current waveforms are proposed to realize S-correction.Analysis was done for homogenous and non-homogenous magnetic fields, plane and curved screen.For the convenience of circuit design, high order sine waveforms are used to approach the ideal deflection current.After optimization, the deflection current is acceptably close to the ideal one, for a deflection angle range from 90° up to 140°.Harmonic current rank rises to four as the deflection angle reaches 140°.A ladder-type driving circuit to realize these sine wave series is also presented.Simulation and experiments prove the proposed method can correct the S-distortion in a very slim CRT.
- 为了对大偏转角下的超薄CRT图像S畸变进行校正, 针对匀强磁场和六极场以及理想纯平和实际曲率荧光屏的情况, 分别推导了进行S校正以实现匀速屏幕扫描所需的扫描电流理论形式.继而采用高阶正弦信号来逼近这一理论电流波形, 以便于电路实现.优化计算后的扫描电流可以在90°直到140°的偏转角范围内以足够精度逼近理论值, 谐波阶数随着角度增大而增加直至四阶.提出了一种梯形电路来实现这一方法, 模拟和实验结果证实了该方法对校正S畸变的效果.
References:
[1] Tong Linsu.Status quo and prospect of display [J].Optoelectronic Technology, 2001, 21(1):1-16.(in Chinese)
[2] Dasgupta Basab B.Magnetic field due to a thick infinitely long coil of arbitrary cross-section [A].In:SID Digest[C].2003.50-53.
[3] Wang Shifu, Ren Zhiyuan.Theoretical exploration on S-correction of deflection current [J].Television Technology, 1998(2):33-35.(in Chinese)
[4] Cao Yuxiu, Tong Xipeng, Yang Xiaosong, et al.A CSCW method for designing CRT correcting lens [A].In:Proceedings of the 7th International Conference on Computer Supported Cooperative Work in Design [C].Rio de Janeiro, Brazil, 2002.189-192.
[5] Elders.Concise manual deflection [M].Philips Co.Ltd, 1988.
[6] Hiratani T, Matsuoka H, Inoue T.Investigation of the magnetization behavior of tension band for CRT [A].In:Proceeding of 7th ASID [C].2002.143-146.
[7] Zhu Hongqing, Wang Miaokang, Huang Biaolin.Characteristics and scanning circuit of camel CRT [A].In:International Vacuum Electronics Conference [C].2002.276-277.
Memo
- Memo:
- Biographies: Gu Wei(1979—), male, graduate;Lei Wei(corresponding author), male, doctor, professor, lw@seu.edu.cn.