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Exposure Control for Image Sensors

An image sensor and sensor technology, applied in the field of image sensors, can solve problems such as hindering halo mitigation technology, less than ideal signal-to-noise ratio, and shortening effective exposure

Active Publication Date: 2018-11-02
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, shortening the effective exposure of other less sensitive color pixels may lead to less than ideal results (possibly low signal-to-noise ratio for those colors, since signal-to-noise ratio is usually related to the amount of charge accumulated in the photodiode)
Additionally, applying anti-halation control uniformly across all differently colored pixels prevents more fine-tuned halo mitigation techniques from being applied

Method used

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  • Exposure Control for Image Sensors
  • Exposure Control for Image Sensors
  • Exposure Control for Image Sensors

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Experimental program
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Embodiment Construction

[0031] overview

[0032] In some embodiments herein, apparatus and methods for controlling effective exposure in electronic image sensors are disclosed. In one embodiment, the total effective exposure of one or more frames may be divided or partitioned into multiple sub-exposures. In another embodiment, the effective exposure of the photodiodes in the color filter array can be varied between the different color channels of the array. In yet another embodiment, the total effective exposure for one or more frames may be divided or partitioned into multiple sub-exposures for pixels in one or more color channels, the sub-exposures having different durations between different color channels .

[0033] Turning now to the drawings, image sensors and exemplary electronics for incorporating image sensors will be discussed in greater detail. Figure 1A is a front view of electronic device 100 including an image sensor. Figure 1B is a rear view of the electronic device 100 . The e...

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Abstract

The invention discloses a method of operating an image sensor. Charges accumulated in the photodiode during the first sub-exposure may be selectively stored in the storage node in response to the first control signal. Charges accumulated in the photodiode during the first reset period may be selectively released in response to the second control signal. Charges accumulated in the photodiode during the second sub-exposure may be selectively stored in response to the first control signal. Charges stored in the storage node from the first sub-exposure and the second sub-exposure may be transferred to the floating diffusion node in response to the third control signal.

Description

[0001] Cross References to Related Applications [0002] This Patent Cooperation Treaty patent application claims priority to US Nonprovisional Application No. 13 / 782,532, filed March 1, 2013, and entitled "Exposure Control for Image Sensors," the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates generally to image sensors, and more particularly to exposure control in image sensors. Background technique [0004] Electronic image sensors such as charge-coupled device (CCD) and complementary metal-oxide-semiconductor (CMOS) sensors typically include one or more photodiodes for each pixel that, when exposed, accumulate light that is incident on the pixel's photodiode. The brightness is proportional to the charge. Some electronic image sensors are used with a mechanical shutter to help control the duration of exposure of the photodiodes to the light source, while others (including, for example, some ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/3745H01L27/146H04N5/359H04N5/355H04N23/12
CPCH01L27/14641H04N25/58H04N25/621H04N25/771H04N25/77
Inventor A·K·沙玛范晓峰李向利温宗晋C·李T·L·吉尔腾
Owner APPLE INC