S-correction in very slim CRTs

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.

基于孟塞尔系统的阴极射线管特性化新方法

提出了一种新的阴极射线管特性化的方法。该方法的特点是采用“视觉匹配”方法 ,在反射体表面色和自发光体之间映射一些色貌因素 ,但没有使用任何复杂的色貌模型。是一种考虑了一些色貌因素的阴极射线管特性化方法。由于该问题的个性因素较多 ,采用BP神经网络实现色空间的非线性映射。实验结果表明 ,只要阴极射线管被标定 ,在办公室环境下 ,该方法可以改进在不同的阴极射线管上重现的颜色。采用 3 7 7 3简单的网络结构 ;分色相样本训练。训练样本平均色差可以达到 3.0 7L u v 色差单位 ,测试样本平均色差可以达到 4 .5 5L u v 色差单位 ,小于阴极射线管的最大可接受色差 ,结果是令人满意的。这在电子商务和办公自动化方面有广泛的用途。