Display Device Provided With Optical Input Function
First Claim
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1. A display device comprising:
- an image display unit configured to display an image on a display screen;
an optical input unit configured to pick up an image of an object adjacent to the display screen;
a coordinate calculator configured to calculate position coordinates of the object by using the picked-up image;
a driver configured to apply any of an electric signal and physical vibration to the display screen;
a detector configured to detect a change in any of the electric signal and the vibration applied to the display screen; and
a contact determination unit configured to determine, based on the change, whether or not the object touches the display screen.
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Abstract
In a display device, an object approaching a display unit is detected by referring to an image picked up by the display unit. An alternating current drive circuit drives an alternating current signal to the display unit, so that a detection circuit detects an amplitude change or a phase shift. Alternatively, a liquid crystal panel is vibrated at a predetermined frequency, so that the strength of the frequency of the vibration sound is detected. This makes it possible to more accurately detect the timing when the object touches the display unit.
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Citations
7 Claims
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1. A display device comprising:
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an image display unit configured to display an image on a display screen; an optical input unit configured to pick up an image of an object adjacent to the display screen; a coordinate calculator configured to calculate position coordinates of the object by using the picked-up image; a driver configured to apply any of an electric signal and physical vibration to the display screen; a detector configured to detect a change in any of the electric signal and the vibration applied to the display screen; and a contact determination unit configured to determine, based on the change, whether or not the object touches the display screen. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification