Technical Field
The present disclosure relates to a contact sensitive device, a display apparatus including the same, and a method of manufacturing the same, including a contact sensitive device which includes an electroactive layer formed of an electroactive polymer, a display apparatus including the same, and a method of manufacturing the same.
Description of the Related Art
Recently, a touch type display apparatus which inputs information by touching a display apparatus is in common use because of an increase in demand for such devices from users using various display apparatus, including liquid crystal display devices and organic light emitting display devices. In response to this, there is ongoing study related to the use of haptic devices, which provide direct and various touch feedbacks to the user. In related art, a haptic device is generally attached to a rear surface of a display panel. Thus, it is difficult to provide immediate and minute feedback in response to the touch of the user. As a result, there is interest in providing a variety of direct feedbacks which are sensitive to the touch of the user by disposing the haptic device above the display panel.
In related art, a vibration motor such as an eccentric rotating mass (ERM) or a linear resonant actuator (LRA) is used as a haptic device in a display apparatus. However, the size of such devices needs to be increased to increase the intensity of the vibrations, because the vibration motor is configured to vibrate the entire display apparatus. Further, is difficult to modulate a frequency of the vibration motor to adjust the level of the vibrations, and a response speed is very low, which are problematic. Furthermore, the eccentric rotating mass and the linear resonant actuator are formed of opaque materials, and thus, it is difficult to dispose the eccentric rotating mass and the linear resonant actuator above the display panel.
In order to solve the above-described problems, a shape memory alloy (SMA) and electro-active ceramics (EAC) are being considered as potential materials for the haptic device. However, the shape memory alloy (SMA) has a low response speed, a short life-span, and is formed of an opaque material. On the other hand, electro-active ceramics (EAC) have low durability against the external impact, and are easily broken due to external impact. The electro-active ceramics are also opaque. Further, it is difficult to manufacture a thin electro-active ceramic.