A light emitting diode backlight driving circuit includes a power supply, at least two connected-in-parallel LED lightbars coupled to an output end of the power supply, a power feedback assembly coupled to each of the LED lightbars, and an adjusting-power block coupled to the power feedback assembly. Electron beams emitted from electron emission elements of a multi-electron beam generating unit receive the lens effect of a lens electrode. Apparatus suitable for carrying out this process is also disclosed. The doped region below each trench is removed to form an opening such that the doped regions below the adjacent pillars are separated from each other. The method of preparing the heat-resistant magnesium alloy member is characterized in a semi-solid injection molding at a range between a solidus temperaaature of the alloy and a liquidus temperature of the alloy. The method for manufacturing a solid electrolyte cell includes a step of applying a paint containing an active material and a binder to a current collector to form a layer of an active material, and a step of impregnating a solid electrolyte in the layer of the active material formed by the active material layer forming step.