Mulitple gated pixel per readout
A system for providing an improved image of daytime and nighttime scene for a viewer within a vehicle is provided herein. The system includes: a pixel array sensor having a fully masked gate-off capability at a single pixel level, wherein the pixel array sensor is provided with an inherent anti-blooming capability at the single pixel level; wherein each pixel is gated by a corresponding transfer gate transistor having high transfer gate efficiency. The system further includes a gating unit configured to control the transfer gate transistors with pulsed or continuous wave modulated active and passive light sources, to yield a synchronized sensing signal from the sensor, wherein a single pulse is sufficient to cover the entire field of view of the sensor and the entire depth of field of the illuminated scene; and a processing unit configured to receive the synchronized sensing signal and process it.
1. A system for providing an improved image of daytime and nighttime scene, the system comprising:
a pixel array sensor having a masked gate-off capability at a single pixel level, wherein the pixel array sensor is provided with an inherent anti-blooming capability at the single pixel level, wherein each pixel is gated by a corresponding transfer gate transistor having a high transfer gate efficiency; and
a gating unit configured to control the transfer gate transistors of the pixel array sensor so as to accumulate a sequence of multiple exposures per single readout of the pixel based on specified exposure parameters,
wherein the pixel sensor array is further configured to operate in at least one mode other than gating.
2. The system according to claim 1 , wherein the pixel array sensor is attached to a moving platform.
3. The system according to claim 1 , wherein the gating unit is configured to operate with a synchronized pulsed light source.
4. The system according to claim 1 , wherein the gating unit is configured to operate with an unsynchronized light source.
5. The system according to claim 1 , wherein the gating unit is further configured to simultaneously gate at least two pixel clusters with different gating parameters by independently controlling the transfer gate transistors of the pixels at the at least two pixel clusters.
6. The system according to claim 5 , wherein the different gating parameters comprise synchronization parameters in regard with one or more light source, to match a different scenery volume for the different pixel clusters.
7. The system according to claim 5 , wherein the different gating parameters are selected, so that an independent accumulation of the signal is carried out for each of the different pixel clusters.
8. The system according to claim 1 , wherein the inherent anti-blooming capability at the single pixel level exhibits a ratio of at least 60 dB between a saturated pixel at the pixel array and a second adjacent pixel.
9. The system according to claim 1 , wherein a low noise in the pixel is achieved by resetting its potential voltage during a period without a light source pulse or light source modulation thus reducing parasitic noise in the photodiode.
10. The system according to claim 1 , wherein the high transfer gate efficiency is achieved by setting a high potential voltage between the pixel to the floating diffusion of the transfer gate thus enabling an intense electrical field which electrical charge carriers have higher probability to be extracted to the floating diffusion.
11. The system according to claim 1 , wherein the high transfer gate efficiency is achieved by setting physical dimensions of the transfer gate, such that the transfer gate at the photodiode side is substantially larger than a transfer gate at the floating diffusion side.
12. The system according to claim 1 , wherein the high transfer gate efficiency is achieved by setting the transfer gate at the photodiode side to be substantially without holes.
13. The system according to claim 1 , wherein the pixel is configured to detect light within a range covering from 400 nm to 1100 nm.
14. The system according to claim 1 , wherein the pixel is configured to detect light within a range covering from 700 nm to 2 μm.
15. The system according to claim 1 , wherein the pixel array sensor configured to operate in conjunction with color filters.
16. The system according to claim 1 , wherein the active light source pulses or active light source modulation are NIR at approximately 800 nm.
17. The system according to claim 1 , wherein the pixel array sensor is sufficiently sensitive to detect reflections arriving from a distance of between approximately 20 m and 200 m wherein the reflection are attenuated prior to reaching the pixel array sensor at least two orders of magnitude.