Electrostatic detection apparatus and method, and coordinate detection program
A shielding member is provided as an electrostatic protection device in extension lines that extend from a sensing area to switching devices via extension areas correspondingly. As a result, even if a body to be detected such as a finger contacts the extension area, it is possible to reduce the amount of the change of an electrostatic capacitance with respect to the movement of the body to be detected. Therefore, it is possible to reduce influences exerted on data to be detected, and an electrostatic detection apparatus having improved coordinate detection accuracy can be provided.
1. An electrostatic detection apparatus comprising:
a sensing area for detecting that a body to be detected contacts or approaches the sensing area;
a plurality of sensor electrodes wired in the sensing area;
a routing-purpose extension line for connecting a section between individual sensor electrodes and an external circuit provided outside the sensing area; and
an extension area that is provided in the vicinity of the sensing area and in which the extension lines are arranged densely;
wherein an electrostatic protection member that suppresses the change of an electrostatic capacitance formed between the body to be detected and the extension line when the body to be detected contacts or approaches the extension area is provided in the extension area, and
wherein the sensing area and the extension area are integrally covered with a cover sheet, and said electrostatic protection member is formed such that a plate thickness dimension of the cover sheet in the sensing area is formed thinner than a plate thickness dimension of the cover sheet in the extension area.
2. The electrostatic detection apparatus according to claim 1 , wherein a step difference is formed between the cover sheet provided in the sensing area and the cover sheet provided in the extension area, and the step difference is formed in at least one of an obverse surface and a rear surface of the cover sheet.