Pixart Imaging Incorporated

Joon-Chok Lee

Kevin Len-Li Lim

Zi-Hao Tan

There is provided an optical sensor including a photodiode, a wave converter, a pixel array and a processor. The photodiode detects ambient light flicker to generate sine waves. The wave converter converts the sine waves to square waves. The processor uses a sampling frequency to count the square waves, and identifies whether the ambient light flicker is well detected according to a counting value of each square wave and a counting value variation of multiple square waves within a count period to accordingly determine whether to adjust an acquiring phase of the image frame.

Optical sensor synchronizing to ambient light flicker and operating method thereof

There is provided an optical navigation device including an image sensor and a processing unit. The image sensor outputs successive image frames. The processing unit calculates a contamination level and a motion signal based on filtered image frames, and determines whether to update a fixed pattern noise (FPN) stored in a frame buffer according to a level of FPN subtraction, the calculated contamination level and the calculated motion signal to optimize the update of the fixed pattern noise.

Navigation device capable of estimating contamination and determining update threshold

Navigation device capable of estimating contamination and denoising image frame

Optical sensor capable of synchronizing to ambient light flicker

There is provided a navigation device including an image sensor, an analog to digital converter and a processor. The image sensor is used to output an analog image using an exposure time. The analog to digital converter is used to convert the analog image to a digital image using a resolution. The processor is used to identify an image quality of the digital image, and adjust at least one of the exposure time of the image sensor and the resolution of the analog to digital converter according to the image quality thereby adjusting the operation power by changing data length actually processed by the processor.

Sensor chip with reduced operation power

Navigation device with adaptive fixed pattern noise update and operating method thereof

There is provided a navigation device including an image sensor and a processing unit. The image sensor is configured to capture reflected light of a work surface with a low-speed period to generate image frames, wherein the image sensor captures a pair of image frames in each low-speed period. The processing unit is configured to calculate acceleration according to the pair of image frames to accordingly identify whether to adjust the low-speed period to a high-speed period.

Navigation device with adjustable sample period

There is provided an interactive system including a mouse device having a mouse case, a detection switch and a control chip. The mouse case is held by a user and operated on a work surface. The detection switch is arranged on the mouse case and configured to output a detected signal according to user operation. The control chip is electrically coupled to the detection switch and configured to enable or disable an angle snapping function according to the detected signal.

Interactive system having angle snap

Navigation device with low power consumption

There is provided a mouse device including a mouse case, a detection switch and a control chip. The mouse case is held by a user and operated on a work surface. The detection switch is arranged on the mouse case and configured to output a detected signal according to user operation. The control chip is electrically coupled to the detection switch and configured to enable or disable an angle snapping function according to the detected signal.

Growing community of inventors

Penang, Malaysia

Joon-Chok Lee