where: Vpmax=the maximum value of the peak n

and: Vpmin = the minimum value of the peak video n

Up = +/-30% is selected from the greater absolute value of Upmax of Upmin. If

|Upmax| > |Upmin| then Up = +|Upmax| is selected, if |Upmin| > |Upmax| then Up =

-|Upmin| is selected. In either case, |Upmax| + |Upmin|

≤ 60%.

(5) Upadj = MAX[ | (Vp(n) - Vp(n+l) | / Vp(n)] x 100%

Upadj is the nonuniformity percentage pixel to pixel

(6) See the discussion on dark uniformity, Ud.

(7) See the section on MTF Discussion and Graph.

Dark Uniformity, Ud

Figure 3, Definition of the Video Pixel in the Light and in the Dark, exemplifies the

definitions of the terminology which are used to explain the video signal characteristics.

Dark uniformity is defined as Ud = Vdmax - Vdmin; Where Vdmax and Vdmin are the

maximum and minimum voltage of Vd, the average dark level of total pixels in scan line

when the LED light is turned off. Vd is measured from Reset Level and this amplitude

between the dark level and this reset level is call PEDESTAL. The pedestal level is

caused by resetting operation of pixel. Although the pedestal remains constant for a

constant clock frequency, the Reset Level will very from ground, because the dark level,

Vd, is factory adjusted to ground (zero volts).

Figure 3. Definition of the Video Pixel in the Light and in the Dark

CP

VIDEO

OUTPUT

Dark Level

PEDESTAL

PEDESTAL

Reset Level

Vp(n) in the light

VIDEO IN LIGHT AND IN

DARK

PAGE 6 OF 9 - PI324MC-A4, 11-15-00