To provide a DA converter including a sampling circuit capable of suppressing a high-frequency component in an input signal without obstructing downsizing of electronic equipment. The lamp preferably is provided with a plurality of LEDs arranged with rows and columns on a circuit card or board. The method provides for patterning the cap layer, the gate metal layer and the gate dielectric layer to form a capped gate conductor. Each pixel region includes eight liquid crystal domains in total, consisting of two sets of four liquid crystal domains A, B, C and D of first, second, third and fourth types, in which an angle formed between any two tilt directions is approximately equal to an integral multiple of 90 degrees. The cooking oil quality sensor measures a cooking oil quality to obtain a cooking oil quality measurement during the predetermined amount time.