VD66GY datasheet(24/37 Pages) STMICROELECTRONICS

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7.3

Color pattern

The VD66GY is a color image sensor featuring a classic 2x2 Bayer pattern, which is composed of red, green and

blue pixels as illustrated in the figure below. This pattern enables host processors to extrapolate the frames of

RAW data output by the VD66GY into an RGB colored image

Figure 15. VD66GY 2x2 pattern

7.4

Microlenses and CRA matching

Each pixel of the matrix has its own microlens covering it.

The purpose of the microlens is to concentrate and optimize photon capture by passing through the module lens

down to the photo diode to increase sensor light sensitivity and to maximize the amount of light received by each

pixel.

The light beam has an incidence angle change when passing through the module lens, increasing from center to

periphery. This is the chief ray angle (CRA).

To compensate for the change of CRA over the matrix, the microlens position over the pixels progressively shifts

from matrix center to matrix borders.

The design of the sensor microlens shift is optimized for matching a lens with CRA of 30° at corners and follows a

linear shift shape.

It is recommended to match the CRA of the lens with the CRA of the image sensor to maximize image quality.

Featuring advanced BSI pixel technology, the VD66GY provides high relative illumination (RI) uniformity up to the

image corners, which enables users to select lenses with different CRA with limited impact.

The following figure presents the CRA tolerance range in lens selection for maintaining a RI uniformity over 90%

across the image.

VD66GY

Pixel performance

DS13838 - Rev 7

page 24/37

VD66GY Fiches technique(PDF) 24 Page - STMicroelectronics