Abstract: A touch panel including a first substrate, a second substrate, a first electrode layer, a second electrode layer, a third electrode layer, and a transparent piezoelectric material layer is provided. The first substrate is opposite to the second substrate. The first electrode layer, the second electrode layer, and the third electrode layer are sequentially arranged and located between the first substrate and the second substrate. The first electrode layer, the second electrode layer, and the third electrode layer are separated from one another. The transparent piezoelectric material layer is disposed between the second electrode layer and the third electrode layer.

Abstract: A food tray adjustment structure for a high chair to adjust the position of the food tray to suit children of different sizes includes a handle with longitudinal sections at two sides to form a biased sliding rail with a skew angle to couple with sliding docks that have coupling troughs formed with the same type of biased surfaces. The sliding docks may form a released or a latched position with coupling sections formed on the armrests at two sides of the chair. Thereby the distance between the backrest and the food tray may be adjusted to suit children of different sizes sitting on the chair.