Common element pixel architecture (CEPA) for fast speed readout
View Patent ↗The present invention relates to a common element pixel architecture (CEPA) imager. The CEPA includes a first column of pixels and a second column of pixels. The CEPA also includes a first column line and a second column line. A first group of pixels is arranged including pixels from the first column and the second column coupled to the first column line. A second group of pixels is arranged including other pixels from the first column and the second column coupled to the second column line.
1. A common element pixel architecture (CEPA) imager comprising:
a first column of pixels;
a second column of pixels;
a first column line;
a second column line;
a first group of pixels including pixels from the first column and the second column coupled to the first column line;
a second group of pixels including other pixels from the first column and the second column coupled to the second column line;
a color filter array having a color pattern arranged on both the first group of pixels and the second group of pixels;
a controller configured to simultaneously output pixel values from pixels of a first color in the first column and in the first group over the first column line and from pixels of the first color in the first column and in the second group over the second column line;
a first readout circuit coupling the pixels in the first group of pixels to the first column line; and
a second readout circuit coupling the pixels in the second group of pixels to the second column line, wherein the first readout circuit and the second readout circuit respectively include a source follower transistor including a drain terminal coupled to a reference voltage line and a reset transistor including a drain terminal coupled to the reference voltage line.
2. The CEPA imager of claim 1 , including a third column line coupled to a third group of pixels including pixels from the first column and the second column.
3. The CEPA imager of claim 2 , including a controller configured to control the first group of pixels, the second group of pixels and the third group of pixels to simultaneously output pixel values on the first column line, the second column line and the third column line.
4. A common element pixel architecture (CEPA) imager comprising:
a first column of pixels and a second column of pixels, each of the pixels including a photodiode and a transfer transistor, wherein the transfer transistor of each pixel in the first column of pixels is controlled by a respective transfer line and wherein each transfer line is coupled exclusively to pixels in a common row;
a first column line;
a second column line;
a first group of pixels including pixels from the first column and the second column;
a second group of pixels including other pixels from the first column and the second column;
a first readout circuit coupling each of the transfer transistors in the first group of pixels to the first column line; and
a second readout circuit coupling each of the transfer transistors in the second group of pixels to the second column line, wherein the first readout circuit and the second readout circuit respectively include a source follower transistor including a drain terminal coupled to a reference voltage line and a reset transistor including a drain terminal coupled to the reference voltage line.
5. The CEPA imager of claim 4 , wherein the first readout circuit and the second readout circuit respectively include:
a plurality of respective transfer transistors coupling the photodiode of each respective pixel to a floating diffusion,
a row select transistor outputting a voltage to the respective column lines based on electric charge in the floating diffusion, and wherein the CEPA imager includes:
a controller configured to control the transfer transistors to transfer electric charge from the respective photodiodes to the floating diffusion, and to control the respective row select transistors to simultaneously output the respective voltages to the respective column lines based on the respective transferred electric charge.
6. The CEPA imager of claim 5 , wherein the reset transistor includes a gate terminal coupled to a reset line and a source terminal coupled to the floating diffusion.
7. The CEPA imager of claim 5 , wherein the reset transistor includes a gate terminal coupled to a respective column line and a source terminal coupled to the floating diffusion.
8. The CEPA imager of claim 4 , wherein the first readout circuit and the second readout circuit respectively include a plurality of respective transfer transistors coupling the photodiode of each respective pixel to a floating diffusion, wherein the source follower transistor outputs a voltage to the respective column lines based on electric charge in the floating diffusion, and wherein the CEPA imager includes:
a controller configured to control the respective transfer transistors to transfer electric charge from the respective photodiodes to the floating diffusion allowing the respective source follower transistors to output the respective voltages to the respective column lines based on the respective transferred electric charge.
9. The CEPA imager of claim 8 , wherein the reset transistor includes a gate terminal coupled to a reset line and a source terminal coupled to the floating diffusion.
10. The CEPA imager of claim 1 , wherein the color pattern is a Bayer color pattern.
11. The CEPA imager of claim 1 , wherein each pixel in the first column of pixels comprises an associated transfer transistor, wherein each transfer transistor is controlled by a respective transfer line, and wherein each transfer line is coupled exclusively to pixels in a common row.