Patent ID: 6166483
Filing Date: 2000-12-26
Classification: H01J

Abstract:
A QPF electron gun for use in a color CRT for directing a plurality of electron beams on a display screen in said color CRT in forming a video image on said display screen, said color CRT including a sealed glass envelope containing said electron gun and display screen, said electron gun comprising:a prefocus lens for initial focusing of the electron beams, said prefocus lens including a G4 grid;a main focus lens disposed intermediate said prefocus lens and said display for focusing the electron beams on the display screen, said main focus lens including a G6 grid;a voltage source; andan internal bleeder resistor disposed within the sealed glass envelope and coupling said G4 and G6 grids to said voltage source for maintaining a fixed voltage differential between said G4 and G6 grids, wherein said G6 grid is maintained at a voltage greater than the voltage of said G4 grid.