| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a light emitting device with less uneven brightness and simple structure by spreading the emitting angle of electrons emitted from an electron emitting electrode, and accelerating many electron beams dispersed at wider angle, then irradiating the accelerated electron beams to a phosphor film. SOLUTION: Electrons emitted from a cold cathode 9 are spread in the lateral direction since the speed component parallel to a substrate on which the cold cathode 9 is formed is large. Electron beams 10 passed through a grid 17 are furthermore accelerated with a strong electric field between the grid 17 and a transparent anode 12, strike a phosphor layer 13, and light is emitted from the phosphor layer 13. Electrons are radiated to the phosphor layer 13 region far wider than the electron emitting region of the cold cathode 9, and light is emitted in the wider area. Equipotential surface 20 is formed in the space between the grid 17 and the transparent anode 12 with a grid 18, the direction of electron beams 10 in the periphery part is turned slightly inward, the angle that the electron beams 10 radiate the phosphor layer 13 is brought vertically close to the phosphor layer 13, reflection or radiation of the secondary electrons is prevented, and energy is effectively used in light emission.</p> |
