Patent ID: 9575215
Date: 2017-02-21
CPC Classifications: G02B,H01J

Claim:
1. A method for making a light blocking plate, comprising: providing a light pervious member being flat-plate-shaped; forming a plurality of spaced ceramic power layers on the light pervious member, wherein each of the plurality of spaced ceramic power layers is made of a composition comprising silicon dioxide in an amount by weight from 40 percent to 45 percent, aluminum phosphate in an amount by weight from 5 percent to 10 percent, and water in an amount by weight from 45 percent to 50 percent; forming a light blocking layer over the light pervious member, and top portions and side faces of the plurality of spaced ceramic power layers; forming an electromagnetic shielding layer having a uniform thickness over the light blocking layer; removing the top portions of the plurality of spaced ceramic power layers with remaining portions of the plurality of spaced ceramic power layers exposed to an outside; removing the remaining portions of the ceramic power layers.