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提出一种具有凹面阴极结构的电子束自会聚型后栅场发射显示器(FED)。利用Ansys软件模拟此器件的电场分布和电子束轨迹,研究凹面阴极不同曲率半径对阳极光斑尺寸的影响,并与平面阴极型后栅FED进行比较。仿真结果表明此器件可有效减小电子束的发散角和阳极光斑尺寸,阳极光斑尺寸随着凹面阴极曲率半径的减小而减小,同时可获得更高的电流密度。利用丝网印刷技术制备10cm×10cm的电子束自会聚型后栅FED,对其场发射性能进行测试。结果表明此器件可有效减小阳极光斑尺寸,提高显示器的分辨率;阳极电压为600V,栅极电压在100～250V范围内对电子发射有良好的调控作用。
An electron beam self-convergence type rear gate field emission display (FED) with a concave cathode structure is proposed. The electric field distribution and electron beam trajectory of this device were simulated by Ansys software to study the influence of different curvature radii of concave cathode on the anode spot size, and compared with planar cathode FED. The simulation results show that the device can effectively reduce the divergence angle of the electron beam and the anode spot size. The anode spot size decreases with the decrease of the radius of curvature of the concave cathode, and a higher current density can be obtained at the same time. A 10 cm × 10 cm electron beam self-converging back gate FED was prepared by screen printing technology and its field emission performance was tested. The results show that the device can effectively reduce the anode spot size and improve the display resolution. The anode voltage is 600V, and the gate voltage is in the range of 100 ~ 250V with good regulation of electron emission.