Patent ID: 6603450
Filing Date: 2003-08-05
Classification: G09G

Abstract:
An image forming apparatus comprising:a plurality of electron-emitting devices arranged in a matrix and including a plurality of first and second wirings; a light-emitting substance for emitting light by irradiation of electrons emitted by said electron-emitting devices; a first driving circuit for applying a scanning selection potential to selected first wirings and for applying a non-selection potential to said first wirings other than the selected first wirings; and a second driving circuit for applying a driving potential corresponding to an image signal to the plurality of second wirings, wherein said first and second driving circuits drive said plurality of electron-emitting devices in accordance with the following condition, Vxâ€² and Vyâ€²>Vth, â€ƒwhere Vth represents a threshold voltage to be applied to an electron-emitting device for emitting electrons needed for the light-emitting substance to emit light, Vx represents a potential difference between a maximum potential corresponding to a maximum luminance level and a minimum potential corresponding to a minimum luminance level among driving potentials selectable based on luminance of the image signal, and Vyâ€² represents a potential difference between the minimum potential and the scanning selection potential.