Abstract: A polishing apparatus includes a polishing device, a polishing fixing device, and a controller. The polishing fixing device includes a rotating mechanism, a sensor, a movement compensation assembly, a first moving assembly and a second moving assembly. The sensor in the polishing fixing device senses pressure applied to the workpiece during polishing, the movement compensation assembly can drive the rotating mechanism to move in compensation, so as to keep the polishing pressure within a certain range for uniformity in polishing, improving the polishing quality and production efficiency of the workpiece.

Abstract: An exemplary apparatus (20) for testing liquid crystal display panels includes an angle adjusting device (21) and a supporting plate (22) mounted on the angle adjusting device for supporting at least one liquid crystal display panel. The angle adjusting device includes a base (211) and a ball-and-socket joint (213) mounted on the base. The ball-and-socket joint includes a rocker (2131) with a spherical end, a first connecting rod (2132) with a groove (2134) and a second connecting rod (2133) with a complementary groove. The grooves of the first and second connecting rods cooperatively define a socket for containing the spherical end of the rocker therein. The first connecting rod is movable relative to the second connecting rod so that the spherical end of the rocker is either locked in a desired position or frees to be manually rotated to a desired position.