Optical touch panels and methods of driving the same
First Claim
1. An optical touch panel, comprising:
- a plurality of light-sensing areas; and
an image sensor controller configured to read signals from the light-sensing areas;
wherein the plurality of light-sensing areas is integrally formed with pixels in a display panel or formed on the display panel, in order to sense incident light originating outside the optical touch panel, andwherein the image sensor controller is configured to;
sense a change in an output from a specific light-sensing area between two time points;
compare information on predicted light intensity of an image displayed on at least one pixel around a corresponding light-sensing area with information on light intensity actually measured in the corresponding light-sensing area; and
determine that there is an optical input to the optical touch panel when the change in the output according to time is greater than or equal to a first reference value or when the measured light intensity is greater than the predicted light intensity of the image by a second reference value.
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Accused Products
Abstract
An optical touch panel may include a plurality of light-sensing areas. The plurality of light-sensing areas may be integrally formed with pixels in a display panel or may be formed on the display panel, in order to sense incident light from outside the optical touch panel. A method of driving an optical touch panel may include sensing a change in an output from a plurality of light-sensing areas between two time points and determining that there is an optical input when the change in the output is greater than or equal to a first reference value that is defined in advance. The light-sensing areas may be integrally formed with pixels in a display panel or formed on a surface of the display panel, for sensing incident light from outside the optical touch panel.
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Citations
19 Claims
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1. An optical touch panel, comprising:
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a plurality of light-sensing areas; and an image sensor controller configured to read signals from the light-sensing areas; wherein the plurality of light-sensing areas is integrally formed with pixels in a display panel or formed on the display panel, in order to sense incident light originating outside the optical touch panel, and wherein the image sensor controller is configured to; sense a change in an output from a specific light-sensing area between two time points; compare information on predicted light intensity of an image displayed on at least one pixel around a corresponding light-sensing area with information on light intensity actually measured in the corresponding light-sensing area; and determine that there is an optical input to the optical touch panel when the change in the output according to time is greater than or equal to a first reference value or when the measured light intensity is greater than the predicted light intensity of the image by a second reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An optical touch panel, comprising:
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a plurality of light-sensing areas; and an image sensor controller configured to read signals from the light-sensing areas; wherein the plurality of light-sensing areas is integrally formed with pixels in a display panel or formed on the display panel, in order to sense incident light originating outside the optical touch panel, and wherein the image sensor controller comprises; a control unit configured to calculate location information of the light-sensing areas and intensity information in the light-sensing areas; a time variation determiner configured to determine whether the change in the output from the light sensing areas according to time is greater than or equal to a first reference value; an input/output variation determiner configured to determine whether the light intensity measured in the light-sensing areas is greater than the predicted light intensity of the image by a second reference value; a logic sum circuit configured to calculate a logic sum of an output from the time variation determiner and an output from the input/output variation determiner; and a weight logic circuit configured to count a time of maintaining an optical input to the optical touch panel.
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15. A method of driving an optical touch panel, the optical touch panel comprising a plurality of light-sensing areas and an image sensor controller configured to read signals from the light-sensing areas, wherein the light-sensing areas are integrally formed with pixels in a display panel or formed on a surface of the display panel, in order to sense incident light originating outside the optical touch panel, the method comprising:
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sensing a change in an output from the plurality of light-sensing areas between two time points; comparing information on predicted light intensity of an image displayed on at least one pixel around a corresponding light-sensing area with information on light intensity actually measured in the corresponding light-sensing area; and determining that there is an optical input when the change in the output is greater than or equal to a first reference value or when the measured light intensity is greater than the predicted light intensity by a second reference value. - View Dependent Claims (16, 17, 18, 19)
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Specification