Optical touch system with brightness compensation and brightness compensation method thereof
AssigneePixart Imaging Inc.
InventorsCheng-Nan TSAI, Tzung-Min SU, Chih-Hsin LIN, Yaun-Yu PENG, Yu-Chia LIN, Chuan-Ching LIN, Teng Wei HSU
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Abstract
There is provided an optical touch system including a touch surface, a plurality of image sensors and a plurality or compensation light sources, wherein each of the image sensors is adjacent to one of the compensation light sources. When one of the image sensors is capturing an image frame, the compensation light source not adjacent to and within a field of view of the image sensor which is capturing the image frame irradiates so as to compensate a brightness distribution of the image frame.
Claims20
An optical touch system, comprising:
- a touch surface;
- a plurality of reflection light bars respectively disposed at a plurality of edges of the touch surface;
- a first image sensor configured to capture image frames looking across the touch surface;
- a first active light source disposed adjacent to the first image sensor;
- and
- a second active light source disposed at a corner of the touch surface and within a field of view of the first image sensor,
- wherein during an interval that the first image sensor captures a first image frame, the first active light source emits light with a first brightness value and the second active light source emits light with a second brightness value smaller than the first brightness value.
An optical touch system, comprising:
- a touch surface;
- a plurality of irradiation light bars respectively disposed at a plurality of edges of the touch surface;
- a first image sensor configured to capture image frames looking across the touch surface;
- and
- an active light source disposed at a corner of the touch surface and within a field of view of the first image frame,
- wherein during an interval that the first image sensor captures a first image frame, at least a part of the irradiation light bars and the active light source emit light.
A brightness compensation method of an optical touch system, the optical touch system comprising a touch surface, a plurality of light bars, a plurality of image sensors and a plurality of active light sources, and each of the image sensors being adjacent to one of the active light sources, the brightness compensation method comprising:
- a first working mode, in the first working mode a first image sensor capturing a first image frame and the active light source not adjacent to the first image sensor and within a field of view of the first image sensor emitting light to compensate a brightness distribution of the first image frame;
- and
- a second working mode, in the second working mode a second image sensor capturing a second image frame, and the active light source not adjacent to the second image sensor and within a field of view of the second image sensor emitting light to compensate a brightness distribution of the second image frame;
- wherein the first working mode and the second mode are executed sequentially.
Dependencies are inferred from the claim text.