VX6854LC datasheet(105/114 Pages) STMICROELECTRONICS

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VX6854LC

Defect categorization

110

13.5

Couplet definition

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

there is a maximum of two failing pixels from the group of nine pixels illustrated in Figure 46.

The example shown in Figure 46 has the centre pixel and the pixel at position [7] failing the

test criteria.

Figure 46. General couplet example

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

respect to the example in Figure 46, 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 25% of that average

value. If the second pixel in the couplet differs by more than 25% of the local pixel average

value then this would be defined as a major couplet.

In addition, couplets will be classified as being in the inner or outer area.

13.6

Physical aberrations

A specific test algorithm is also applied in production to identify and reject samples that

display defocused artefacts often referred to as blemishes or shapes. These artefacts are

caused by scratches or contamination in the optical path away from the focal plane for

example, on the IR glass or lens.

The test requires two regions to be defined:

•

a small area: 9 by 9 pixels with the pixel under test at the centre of this area (shaded

blue in Figure 47)

•

a large region, 31 by 31 pixels (shaded red in Figure 47)

Figure 47. Test region definition

[0]

[1]

[2]

[X]X

[3]

[6]

[5]

[4]

9 pixels

31 pixels

Small

area

Large area

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