Display device and fabrication method thereof

A display device comprising:

• a back panel which includes a plurality of cathode lines, a plurality of electron sources which are arranged on the plurality of respective cathode lines, control electrodes which are arranged to face the cathode lines in an opposed manner and controls an emission quantity of electrons from the electron sources and a back substrate which holds the cathode lines;
• and
• a face panel which includes an anode and fluorescent materials, wherein
• the control electrode includes a plurality of small apertures which allow electrons emitted from the electron sources to pass therethrough to the face panel side at regions which respectively face the each electron source, and
• each respective electron source is divided into a plurality of small electron sources corresponding to the plurality of respective small apertures, and the small electron sources and the control electrodes contain boron.

A display device comprising:

• a back panel which includes a plurality of cathode lines, a plurality of electron sources which are arranged on the plurality of respective cathode lines, control electrodes which are arranged to face the cathode lines in an opposed manner and controls an emission quantity of electrons from the electron sources and a back substrate which holds the cathode lines;
• and
• a face panel which includes an anode and fluorescent materials, wherein
• the control electrode includes a plurality of small apertures which allow electrons emitted from the electron sources to pass therethrough to the face panel side at regions which respectively face the each electron source and projecting portions which extend to the back substrate side at portions which differ from portions which face the cathode lines,
• each respective electron source is divided into a plurality of small electron sources corresponding to the plurality of respective small apertures, and
• assuming a distance between top faces of the small electron sources and bottom surfaces of the small apertures as “a” and a distance between inner surfaces of the projecting portions and a side face of the small electron source closest to the inner surfaces of the projecting portions as “b”, a relationship b≧2a is established.

A method of manufacturing a display device which comprises a back panel which includes a plurality of cathode lines, a plurality of electron sources which are arranged on the plurality of respective cathode lines, control electrodes which are arranged to face the cathode lines in an opposed manner and controls an emission quantity of electrons from the electron sources and a back substrate which holds the cathode lines, and a face panel which includes an anode and fluorescent materials;

• and makes the fluorescent material to emit lights in response to electrons irradiated from the electron sources to perform a display, the method comprising following steps of:
• (i) forming the plurality of cathode lines on the back substrate;
• (ii) forming the plurality of electron sources to each cathode line;
• (iii) adhering boron to respective electron sources by way of masks each of which has a plurality of small openings corresponding to each electron source;
• and
• (iv) forming portions of each electron source which correspond to the small openings and to which the boron is adhered into small electron sources by heating each electron source.