MOVABLE TOUCHPAD WITH HIGH SENSITIVITY
First Claim
1. A highly sensitive movable touchpad for a digital apparatus having a cursor, comprising:
- a slidable template having a front surface exposed and a back surface with a specific texture;
a limiting member, for limiting the slidable template within a moving range and providing the slidable template with a low friction, surrounding the slidable template and exposing central portion of the front surface of the slidable template;
an optical displacement detecting device, located below the slidable template, for detecting movement of the slidable template, including;
a light source, for emitting light beams to illuminate the back surface of the slidable template;
an image sensor for receiving speckle images formed by light beams scattered by the back surface; and
an image processor for obtaining relative location, moving direction and speed of the slidable template by comparison of the speckle images; and
a control unit for controlling corresponding movement of the cursor of the digital apparatus according to the relative location, moving direction and speed obtained from the image processor.
2 Assignments
0 Petitions
Accused Products
Abstract
A highly sensitive movable touchpad is disclosed in the present invention. It is used for laptop computers and has a slidable template for users to move so that a cursor can be controlled by the touchpad. A resistive or capacitive detecting surface can be applied for detecting users'"'"' click, double click, drag, or scroll motion on any point of the surface. Additionally, there is an optical displacement sensor provided under the slidable template for detecting surface information on the back surface of the slidable template. A sequence of images of surface movement are processed by an image processing unit. Then, relative movement information is calculated and sent to an operating system in the computer. The operating system controls the cursor with the relative movement information. The present invention uses edge detectors for dynamically controlling the cursor and calibrating location of the cursor so that positioning of the touchpad is synchronous with the cursor.
-
Citations
20 Claims
-
1. A highly sensitive movable touchpad for a digital apparatus having a cursor, comprising:
-
a slidable template having a front surface exposed and a back surface with a specific texture; a limiting member, for limiting the slidable template within a moving range and providing the slidable template with a low friction, surrounding the slidable template and exposing central portion of the front surface of the slidable template; an optical displacement detecting device, located below the slidable template, for detecting movement of the slidable template, including; a light source, for emitting light beams to illuminate the back surface of the slidable template; an image sensor for receiving speckle images formed by light beams scattered by the back surface; and an image processor for obtaining relative location, moving direction and speed of the slidable template by comparison of the speckle images; and a control unit for controlling corresponding movement of the cursor of the digital apparatus according to the relative location, moving direction and speed obtained from the image processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification