| 摘要 |
PURPOSE:To achieve the high resolution and the energy saving, by employing 7-8% of light reflection factor viewed from the outer face of the bulb front face wall thereby achieving the easy-to-see data display with reduced operation beam current. CONSTITUTION:The drawing shows an enlarged partial cross-section of the bulb front face wall of a color picture tube, and when an external light is projected to a front face wall 1 a portion of it will be reflected at the outer face to produce a reflected light 6. The remaining portion will pass through said wall 1 then partially reflected at the inner face to produce a reflected light 7. The reflected light 6 at the outer face of said wall 1 is approximately 4% of the external light 5 and constant, but the reflected light 7 at the inner face is determined by the light permeability of said wall 1 and the condition of a phosphor face 2, and it will decrease as the ratio of a light absorption matrix layer 3 against the phosphor face 2 will increase. The optimal beam current is minimized at 7-8% of the reflection factor. |
