Field emission plane light source and preparing method thereof

Abstract

The invention provides a field emission plane light source which comprises the components of: an anode, a focusing electrode, a gate electrode, a cathode and an isolator. The anode, the focusing electrode, the gate electrode, the cathode and the isolator form a vacuum sealed chamber. The anode comprises an anode substrate, an anode conducting layer and a light emitting layer successively. The isolator comprises an isolator body and a side wall supporting member. The isolator body is provided with a funnel-shaped through hole. The large opening end of the isolator body is connected with the light emitting layer, and the small opening end is connected with the focusing electrode through the side wall supporting member. The focusing electrode is provided with a focusing through hole which can focus electrons. The gate electrode is provided with a gate electrode through hole which allows passing-through of electrons that are transmitted by the cathode. The gate electrode is sandwiched between the focusing electrode and the cathode through the side wall supporting member. The cathode comprises a circular sheet-shaped cathode emitter, a cathode conducting layer and a cathode substrate successively. The upper surface of the cathode conducting layer is provided with a plurality of cathode emitters. The invention further provides a preparing method for the field emission plane light source.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a field emission planar light source and a preparation method thereof. Background technique [0002] The principle of the field emission planar light source is: a voltage is introduced in the vacuum zone between the cathode and the anode to generate an electric field, so that the electric field stimulates the cathode emitter to emit electrons and hits the phosphor coated on the anode under the accelerated attraction of the positive voltage on the anode. , resulting in a luminescent effect. [0003] Field emission planar light sources can be widely used in various lighting fields due to their advantages of energy saving, environmental protection, ability to work in harsh environments (such as high-temperature and low-temperature environments), and thinness. Compared with the traditional backlight module, the field emission planar light source not only has a simple structu...

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Problems solved by technology

[0004] In the actual working process, the anode will produce a certain amount of residual gas under the bombardment of the electron beam emitted from the cathode. The ionization energy of some of these gases is less than the energy of the electron beam emitted from the cathode, so ionization will occur. The ionized positive ions will bombard the cathode surface perpendicular to the cathode surface under the action of a strong electric field, resulting in damage to the cathode electron emission material, resulting in a decline in emission capability, which seriously affects the stability and life of the field emission planar light source.

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