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Welcome to HP Customer Support

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  • Information
    Information regarding recent vulnerabilities

    HP is aware of the recent vulnerabilities commonly referred to as "Spectre" and "Meltdown". HP has published a security bulletin with patches for these issues and a list of impacted systems. We will continue to update the bulletin as more information becomes available and encourage customers to check the bulletin frequently.

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HP Notebook PCs and Tablets - About LCD Panel Defects and Terminology for Notebook PCs and Tablets

This document provides definitions of industry standard terminology related to the various cosmetic conditions of liquid crystal display (LCD) panels.
Clean the display
LCD screens accumulate smudges and scratches all the time. To clean these, choose a non-abrasive cloth or towel. Plastic and glass cleaners containing ammonia may leave a glare-causing film, so use a computer monitor specific cleaner from a computer store. Spray the cleaner onto the cloth, then wipe the screen with it.
LCD panel quality
All HP and Compaq notebook LCDs adhere to strict quality and reliability specifications. A small percentage of LCD panels may have minor cosmetic manufacturing anomalies or irregularities such as bright or dark dots in the viewable area. These cosmetic imperfections are common to all LCD panel types and are not specific to any HP model or product line.
Definition of LCD terms
Pixel
Picture element. A pixel consists of 1 red (R), 1 green (G), and 1 blue (B) sub-pixel, each of which are commonly referred to as dots.
Dot
Elements that make up a pixel. Dots are one of three colors; R, G, or B. Sub-pixel transistor or dot failures may appear in several different ways.
Always On
Bright dot on a dark background.
Always Off
Dark dot on a bright background.
Spot
A spot generally refers to an optical distortion due to foreign material contamination inside the cell. Spots are usually seen as small irregular dark areas.
Lines
Lines appearing in the display pattern of the LCD. Lines may appear dark or bright and may be displayed in a horizontal or vertical position.
Polarizer dent
Physical damage to the Polarizer, which does not damage the glass. Dents may be observed when the LCD is illuminated and may appear as ghosted white lines or with dark display patterns. Polarizer dents are most likely to appear as pockmarks caused by a strike to the display.
Polarizer bubble
Tiny air pockets behind the Polarizer.
Polarizer scratch
Physical damage to the Polarizer that does not damage the glass.
LCD Replacement Criteria
HP uses the following set of criteria when damaged LCDs are submitted for warranty coverage.
  note:
All LCD panel defects should be examined at the highest possible resolution using both the brightest and darkest possible backgrounds, as some sub-pixel failures may not be readily visible under certain conditions.
For dots always on or off:
  • 720p, HD, SD, SD+, SVGA, VGA, WSVGA, WXGA, and XGA Panels, <1.05M pixels
    • 6 or more dots in any combination and any color that are always on or off
    • Any 2 dots within 25mm of each other that are always on
    • Any 2 dots within 15mm of each other that are always off
  • HD+, SXGA+ and WXGA+ Panels, <1.6M pixels
    • 7 or more dots in any combination and any color that are always on or off
    • Any 2 dots within 25mm of each other that are always on
    • Any 2 dots within 15mm of each other that are always off
  • FHD, UXGA, and WSXGA+ Panels, <2.1M pixels
    • 8 or more dots in any combination and any color that are always on or off
    • Any 2 dots within 25mm of each other that are always on
  • WUXGA Panels, >=2.1M pixels
    • 9 or more dots in any combination and any color that are always on or off
    • Any 2 dots within 25mm of each other that are always on
    • Any 2 dots within 15mm of each other that are always off

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