Samsung Sdi Co., Inc.

Tae-il Yoon

Chang-Seok Rho

Wan Kim

Chong-In Chung

Do-hun Pyun

Jeong-in Yoo

A cathode ray tube with a panel that has a thickness of the central portion of an effective area of a screen surface that is TC, a thickness of a vertical edge that is TV, a thickness of a horizontal edge portion that is TH, and a thickness of an edge in a diagonal direction that is TD. The respective values of TC, TV, TH and TD satisfy the expression (TH&minus;TC)&plus;(TV&minus;TC)&plus;(TD&minus;TC)<TC/3, and the radius of curvature in the diagonal direction of the outer surface of the effective area is 1450 mm or more. Thus, by limiting the difference in thickness of the central portion and the peripheral portion of the effective screen area of the panel and the curvature radius of the inner and outer surfaces of the effective screen, the weight of the panel is reduced and an increase of an incident angle caused by flatness of the screen panel is prevented so that a convergence feature of an electron beam is improved. Also, emotional sense of flatness according to the flatness of the screen surface can be improved.

Panel of cathode ray tube

A cathode ray tube (CRT) having a phosphor screen in which red, green, and blue phosphors are located in a black matrix in a pattern, at the inside of a panel, a low-reflectivity coating layer located at the outside of the panel, the low-reflectivity coating layer having a reflectivity of 2.0% or less near 480&tilde;600 nm, wherein the panel is glass containing neodymium (Nd) in a concentration of 0.1&tilde;1.5 wt % and praseodymium (Pr) in a concentration of 0.1&tilde;0.7 wt %. The CRT has improved brightness and contrast characteristics, and has an enlarged color reproduction range. Also, the problem of the unattractive color of the CRT itself under an external illumination is solved.

Growing community of inventors

Suwon, South Korea

Tae-il Yoon