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Panel manufacturers set limits as to how many defective dots (or sub-pixels) are deemed to be acceptable on any LCD panel.
BenQ’s manufacturer warranty covers any defects that exceed the defect specifications described in this document.
LCD displays are made of pixels. Each pixel is made up of a red, green and blue sub-pixel, each sub pixel are driven by an individual transistor. If a transistor becomes defective, the corresponding dot may be permanently light (bright) or may not light (dark). Independently of the brand and the manufacturer, it is common for one or more sub-pixels to become fixed in an unchanging state.
The defective pixel/sub-pixel phenomenon is as follows:
(1) Color white - a bright/hot sub-pixel (always ON)
(2) Color black - a dark sub-pixel (always OFF)
(3) Color red, green or blue - a stuck sub-pixel (always ON or always OFF)
A full pixel consists of one red, green, and blue sub-pixel.
A bright sub-pixel is one that is fully lit. In the following example the blue sub-pixel remains lit even when the surrounding sub-pixels are unlit.
A sub-pixel that is always colored on a white background.
Bright sub-pixel
Dark sub-pixel
The specifications for the number of defects that are deemed to be acceptable for each size of LCD panel are:
|
Panel Type |
Native Resolution |
Bright sub-pixel |
Dark sub-pixel |
Total Allowable Sub-pixel |
|
Smaller
than FHD |
Smaller
than 1920x1080 |
3 |
3 |
5 |
|
Full
HD (FHD) |
1920x1080
(1080p) |
2 |
5 |
5 |
|
Quad
HD (QHD) |
2560x1440
(1440p) |
2 |
5 |
5 |
|
Ultra
HD (UHD) |
3840x2160
(4K) |
2 |
5 |
5 |
Note: Specification is subject to change without notice and may vary from different regions.
