Force detection apparatus

A display apparatus with a touch detection function comprising:

• a display panel that displays an image toward an input surface;
• a first electrode facing the input surface to which an object to be detected applies a force, the first electrode being provided in the display panel;
• a backlight apparatus;
• a first layer disposed between the display panel and the backlight apparatus, the first layer being deformed by the force;
• a second electrode that faces the first electrode across the first layer and that is provided under the backlight apparatus;
• a second layer that is disposed under the backlight apparatus, the second layer being deformed by the force;
• a conductor facing the second electrode across the second layer;
• and
• a force detection controller calculates a force signal value indicating the force, based on a first influence amount and a second influence amount,
• wherein only the first layer becomes thin without deforming the second layer that is farther to the input surface than the first layer when applying the force less than a predetermined magnitude to the input surface, and
• wherein the first layer and the second layer become elastically deformed when applying the force no less than the predetermined magnitude to the input surface causes.