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Image sensing device with high dynamic range

An image sensor and pixel technology, applied in the direction of image communication, image signal generator, color TV parts, etc., can solve the problems of sacrificing resolution, brightness response and signal-to-noise ratio, etc., to minimize motion artifacts, improve Quality, time spent reduction effect

Inactive Publication Date: 2018-07-31
CISTA SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While NIR detection is possible with NIR filters, it sacrifices performance in resolution, luminance response, and signal-to-noise ratio

Method used

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  • Image sensing device with high dynamic range
  • Image sensing device with high dynamic range
  • Image sensing device with high dynamic range

Examples

Experimental program
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Embodiment 1

[0053] like figure 2 As shown, the present embodiment adopts an RGB quadrant pixel sensor structure, including: a Bell pattern cell array, wherein each Bell pattern cell includes four pixels, wherein each pixel further includes: a photodiode for detecting near-infrared light ( PD) and three photodiodes for detecting visible light, the four photodiodes are in a 2*2 configuration and have different integration times.

[0054] This embodiment includes: an array of optical filter combinations, where each optical filter combination corresponds to a pixel and its four photodiodes.

[0055] Each of the optical filters (Optical Filter) covers a photodiode, that is, a sub-pixel.

[0056] The pixels in the Bell pattern unit are arranged in 8 rows (0-7 marks) by 8 columns (0-7 marks), a total of 64, which are square, and each pixel is divided into 2*2 square sub-pixels, in the form of A checkerboard pattern in a 4*4 configuration, with a total of 256 sub-pixels.

[0057] The width of...

Embodiment 2

[0110] like Figure 11 As shown in (b) and (d), this embodiment adopts an RGB-NIR quadrant pixel sensor structure, including: an array of Bell pattern cells, wherein each Bell pattern cell contains 2*2 pixels, and each pixel further contains: One photodiode for near-infrared (NIR) detection and three photodiodes for visible light, with four photodiodes having different integration times.

[0111] Each pixel further includes three visible light filters and one NIR filter.

[0112] Each of said visible light filter and NIR filter covers a photodiode, ie a sub-pixel.

[0113] Each photodiode is further provided with a microlens for guiding incident light to reach the corresponding photodiode.

[0114] This embodiment includes an array of filter combinations, wherein each filter combination corresponds to a pixel and its four photodiodes, and the filter combination includes at least two different filters.

[0115] The filter combination array in one Bell mode unit includes: a r...

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Abstract

The invention provides an image sensing device with a high dynamic range. The device includes an array of Bayer pattern units. Each of the Bayer pattern units comprises a plurality of pixels and eachof the plurality of pixels comprises a plurality of photodiodes. At least one of the plurality of photodiodes in each pixel is configured to detect near infrared (NIR) light and at least one of the plurality of photodiodes in each of the plurality of pixels is configured to detect visible light. At least two photodiodes have different integral times and each photodiode is provided with a micro lens which can guide incident light to the corresponding photodiode. The device also comprises an array of optical filter combinations. Each of the optical filter combinations may correspond to a pixel and the multiple photodiodes thereof and has at least two different filters, and at least two photodiodes corresponding to each optical filter are corresponding to different integral times. The devicecan integrate the times-domain HDR function with minimized motion artifact and multiple integral times and can be applied to visible light sensing, non-visible light sensing and the combination thereof to acquire HDR images with improved quality.

Description

technical field [0001] The invention relates to a technology in the field of visible light-infrared light image sensors, in particular to an image sensor device with a high dynamic range. Background technique [0002] Charge-coupled device (CCD) sensors and complementary metal-oxide-semiconductor (CMOS) sensors are widely used in visible light and infrared (IR) imaging, and dynamic range is an important performance index of these two solid-state sensing devices. Dynamic range can be defined as the ratio of the highest brightness to the lowest brightness an image sensor can detect. HDR (High Dynamic Range) images are usually clearer and richer than normal images because they better preserve both highlight and shadow details. Some existing techniques (such as exposure bracketing) generate an HDR image by taking multiple images with different exposure times and combining the features of each image. Such methods take tens of milliseconds and are susceptible to object motion, g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/225H04N5/238H04N5/235H04N5/353H04N5/355H04N5/33H04N23/12H04N23/75H04N25/46
CPCH04N23/55H04N23/741H04N23/75H04N23/73H04N25/533H04N25/58H04N25/583H04N25/131G01J3/2803G01J3/36G01J2003/2806G01J3/0208H04N25/46H04N23/12H04N23/11
Inventor 不公告发明人
Owner CISTA SYST
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