Patent ID: 6836062
Filing Date: 2004-12-28
Classification: H01J

Abstract:
A cathode ray tube, comprising:a tube including a face panel having an inner surface of which is formed a phosphor screen, a funnel connected to the face panel, and a neck connected to the funnel; a color selection apparatus including a shadow mask having a plurality of apertures passing electron beams formed in an effective area of the shadow mask, and a mask frame mounted to an inside of the face panel while fixedly supporting the shadow mask; an electron gun mounted within the neck and emitting the electron beams toward the phosphor screen; a deflection apparatus mounted to an outer circumference of the funnel and generating a deflecting magnetic field in a path of the electron beams to deflect the electron beams; and a moire compensation circuit included in a circuit portion connected to the deflection apparatus, the moire compensation circuit causing interference in a deflecting signal supplied to the deflection apparatus to perform moire compensation; wherein the color selection apparatus satisfies the following condition, 0.76&GreaterEqual;KeKo&GreaterEqual;0.85where Ko is a K value at a center point of the effective area and Ke is a K value at a horizontal end of the effective area, and wherein K satisfies the following condition, K=DLPvÃ—BsPswhere DL is a vertical length of the apertures, Pv is a vertical pitch of the apertures, Bs is vertical diameter of the electron beams landing on the effective area, and Ps is a vertical pitch of the electron beams landing on the effective area.