Patent ID: 9292090
Filing Date: 2016-03-22
CPC Classification: G06F

Claim Text:
1. A haptic feedback device which provides haptic feedback to a user touching a panel, the haptic feedback device comprising: the panel; an image display unit configured to display an image on the panel; an image feature extraction unit configured to extract a feature of the image displayed on the panel, the feature of the image extracted being the spatial frequency of the image; a position obtaining unit configured to obtain a first touch position which is a position of a touch made on the panel by the user and a second touch position which is a position of a touch made on the panel by the user after the touch made at the first touch position; a speed calculation unit configured to calculate a speed of a touch starting at the first touch position and ending at the second touch position; a modulation signal generation unit configured to generate a modulation signal having a frequency component at a frequency that increases with the speed and is dependent on the feature of the image; a carrier frequency determination unit configured to determine a resonance frequency to be used for a frequency for the carrier signal from among a plurality of resonance frequencies of the panel, the determined resonance frequency increasing as the spatial frequency increases such that the higher the spatial frequency the higher the resonance frequency; a carrier signal generation unit configured to generate a carrier signal for vibrating the panel having a frequency component at the determined resonance frequency determined by the carrier frequency determination unit; a modulation unit configured to modulate the generated carrier signal using the modulation signal; and an actuator which provides haptic feedback to the user by vibrating the panel in accordance with the modulated carrier signal.