An array substrate for a liquid crystal display device and method of manufacturing the same are provided. The monitor comprises: a GRIN lens having a tap film for transmitting and reflecting an optical signal from an input and an output optical fiber with a predetermined ratio; and a photodiode having a lens for detecting and measuring part of the optical signal that has transmitted through the tap film. A transistor can be connected across the resistor to shunt current that would otherwise pass through the resistor during an overshoot mode. A resolution of P2 is set at a value greater than resolutions of P1 and P3. The present coating provides a scratch resistant coatings for use on plastic substrates, which are needed in a variety of applications such as, high index ophthalmic and sportswear lenses, as well as automobile side windows and aircraft cockpit applications. Improved pinning of a free-layer in a CIP GMR sensor stack is provided using dual in-stack biasing layers.