Pixart Imaging Incorporated

Pixart Imaging (Penang) Sdn. Bhd.

Kwai-Lee Pang

Swee-Lin Thor

Sai-Mun Lee

Lee-Ling Teh

A pixel circuit including a photodiode, a first storage capacitor and a second storage capacitor is provided. The first storage capacitor discharges to a first output voltage in a first exposure time and to a third output voltage in a third exposure time. The second storage capacitor discharges to a second output voltage in a second exposure time and to a fourth output voltage in a fourth exposure time. The first and second exposure times are included in a first frame period. The third and fourth exposure times are included in a second frame period. The second frame period is a next frame period of the first frame period. In the first frame period, the first exposure time is subsequent to the second exposure time. In the second frame period, the third exposure time is prior to the fourth exposure time.

Operating method of pixel circuit and image system

Pixel circuit with low power consumption, image system including the same and operating method thereof

There is provided a BJT pixel circuit including a BJT transistor, a photodiode, a first storage capacitor and a second storage capacitor. The first storage capacitor is configured to discharge, via the BJT transistor, to a first output voltage in a first exposure time of the photodiode. The second storage capacitor is configured to discharge, via the BJT transistor, to a second output voltage in a second exposure time of the photodiode.

BJT pixel circuit capable of cancelling ambient light influence, image system including the same and operating method thereof

The present invention discloses an image processing method and an image processing system adopting the same. The method includes the steps of: (a) obtaining a pixel array representing an image; (b) segmenting the pixel array into two or more non-overlapping regions; (c) identifying a capacitor discharging rate of each of the regions; (d) generating a pulse width modulation (PWM) signal when a voltage level dropping of a capacitor exceeds a predetermined threshold; and (e) applying exposure parameters to the regions according to the capacitor discharging rate of the regions, respectively, wherein the exposure parameter applied to one of the regions is different from the exposure parameter applied to at least another one of the regions.

Image processing method and image processing system assigning different gains to different sections

The present invention discloses a method for pixel image non-uniformity compensation. The method including the steps of: first, receiving an input image by an image sensor having a plurality of pixels, wherein each pixel includes a variable capacitor; next, calculating brightness information of at least a portion of the pixels; and further, trimming the capacitances of the variable capacitors in the portion of pixels respectively according to the brightness information.

Pixel image non-uniformity compensation method based on capacitance trimming and image sensor having pixels with variable capacitors for non-uniformity compensation

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Penang, Malaysia

Kwai-Lee Pang