An edge narrowing method for a display panel is disclosed. The method includes the steps of providing the display panel, a grinding apparatus and a polishing apparatus; tilting the display panel so that the first substrate and a grinding member of the grinding apparatus have a first grinding angle therebetween; grinding the first substrate and the light-shielding area with the grinding apparatus while the display panel is tilted at the first grinding angle, thereby forming a first grinding end surface; stopping grinding of the first substrate and the light-shielding area when the width of the light-shielding area is between 0.35 and 1 mm; and polishing the first grinding end surface with the polishing apparatus to form a first end surface.

An ultra-high vacuum seal assembly includes a circuit board, a first ring, and a second ring. The first ring and the second ring include indium. The circuit board includes a first surface and a second surface that is opposite the first surface. The circuit board also includes a via array that is in electrical communication with the first surface and the second surface of the circuit board. The first ring is positioned directly on the first surface of the circuit board and the second ring is positioned directly on the second surface of the circuit board.