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VV6501

VGA CMOS Color Image Sensor

STMicroelectronics 

Defect Categorisation

VV6501

8.4.3

Couplet definition

A failing pixel at X with a failing pixel at position [0] or [1] or [2] or [3] or [4] or [5] or [6] or [7] such that

there is a maximum of 2 failing pixels from the group of 9 pixels illustrated in Figure 33 is described

as a couplet fail. The example shown on the right in Figure 33 has failing pixels at the centre

location and at position [7].

Figure 33: General couplet examples

[0] [1] [2]

[7] X [3]

[6] [5] [4]

[0] [1] [2]

X X [3]

[6] [5] [4]

The basic couplet definition is further subdivided into minor and major couplets. With respect to the

example in Figure 33, a minor couplet is defined as a defect pixel pair where one pixel can be an

extreme fail, that is a “stuck at black” or “stuck at white”, but the second pixel in the pair must differ

from the local pixel average by less than 15% of that average value. If the second pixel in the couplet

differs by more than 15% of the local pixel average value then this would be defined as a major

couplet.

Note that the test program considers a couplet as 2 independent pixels. If the test identifies two

independent pixel fails (pixels that differ by more than 15% from pixel average of neighbors) that

form a couplet with 2 minor pixel fails within the inner area, the device fails the test and is rejected.

If however the test identifies 2 couplets where the pixels span the border between the inner and

outer areas and where only one of the pixels in the inner area is determined as a major fail and the

other a minor fail, then this device passes the test.

8.4.4

Cluster definition

We define a cluster fail as a failing pixel with at least two adjacent failing pixels. In the example from

Figure 34, there are additional pixel fails in positions [0] and [7]. This example constitutes a cluster.

A sensor containing a cluster is always rejected.

Figure 34: Cluster example

[X] [1] [2]

[X] X [3]

[6] [5] [4]

8.5 Summary pass criteria

Table 25: Sensor pixel defect pass criteria

Single pixel fails

Minor Coupleta

Major Coupletb

Clusters

<=120

1 (2)

0

0

a. Test program will allow maximum of one minor couplet in inner zone of pixel array.

Test program will allow maximum of two minor couplets in outer zone of pixel array.

b. No major couplet allowed.

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