Manual

114
IND100351-2
Appendix
Pixel Defect Policy
PIXEL DEFECT POLICY
Dot-defects (Bright or dark spots on the panel)
Due to the effect that dot failures are part of the TFT technology such failure occurrence cannot be prevented basically. Even though
dot defects usually occur during production process, new defects can appear within the lifespan of a TFT display. Neither the production
at LCD-supplier nor the use of a LCD-Monitor after shipment can be inuenced by Hatteland Display. Hence Hatteland Display cannot be
made responsible for such dot failures. However Hatteland Display understand and accepts the responsibility towards the customers for
the delivery of new displays, therefore accepts a limitation on dot defect’s occurrence on new displays delivered to the customer.
PRINCIPLES
a. One pixel consists of 3 dots (Red, Green and Blue)
b. Dot defects are differentiated between:
• Bright dot defects: Spot on the panel appear as pixels or sub pixels that are always lit. Non-extinguishing dot.
• Dark dot defects: Spot on the panel appear as pixels or sub pixels that are always dark (off). Non-lightening dot.
c. Inspector observes the LCD from normal direction at a distance of 50cm above the worktable. Dark dots are counted
under entire white screen. Bright dots are counted under entire black screen.
d. Dot failures within tolerances below do not qualify for warranty claims.
PIXEL DEFECT TOLERANCES
Bright dot ≤ 4 dots
Two adjacent bright dots * ≤ 2
Distance between 2 dot defects * ≥ 15mm
Dark dots ≤ 8
Total number of bright or dark dot defects. * ≤ 8
* 1 or 2 adjacent dot defects considered as 1 defect.
EXTRAORDINARY CIRCUMSTANCES
Possible cases which cannot be inuenced either by customer or Hatteland Display.
Examples for extraordinary circumstances:
• Allocation from LCD-Supplier
• Outstanding high number of LCD-panels with bright dots but within LCD-suppliers Specication.
• Sharply increased demand by customer
In such cases a mutual agreement is inevitable.
Examples:
• Acceptance of bright dots in “non-critical” display areas.
• Acceptance of bright dots with dened color.
Last Revised July 2007