An exemplary embodiment of the present invention relates to a liquid crystal display having a display area and a non-display area which includes a first substrate and a second substrate facing the first substrate, a layer having a first opening, a spacer disposed in the first opening, and a first light blocking member disposed in the non-display area. The first layer 9 is not thinner than 50 nm. The finger hold is formed in a shape that, when the outer needle is moved in the direction of its tip relative to the inner needle, causes force applied in the direction in which the finger hold projects relative to the center axis of the outer needle to act on the finger hold. Example circuits including zero voltage switching flyback and forward converters which require only one magnetic circuit element are revealed. The length of the sampling period determines the number of samples needed to get an acceptable detection probability.