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231E1 LCD
10
W
Definition of Pixel Defects
(PM)
The screen is too bright or
too dark
An after-image appears
An after-image remains
after
the power has been
turned off
Green, red, blue, dark,
and white dots remains
Adjust the contrast and brightness on On-Screen
Display.(The backlight of the LCD monitor has a fixed life
span. When the screen becomes dark or begins to flicked,
please contact your sales representative).
If an image remains on the screen for an extended
period of time, it may be imprinted in the screen and
leave an after-image. This usually disappears after a
few hours.
This is characteristic of liquid crystal and is not
caused by a malfunction or deterioration of the
liquid crystal. The after-image will disappear after a
peroid of time.
The remaining dots are normal characteristic of
the liquid crystal used in today’s technology.
Bright Dot Defects
Bright dot defects appear as pixels or sub pixels that are
always lit or 'on'. That is, a bright dot is a sub-pixel that
stands out on the screen when the monitor displays a dark
pattern. There are the types of bright dot defects:
One lit red, green or blue sub pixel
For further assistance, refer to the Consumer Information Centers list
and contact your local Philips distributor.
Definition of Pixel Defects
This section explains the different types of pixel defects and
defines acceptable defect levels of each type. In order to
quality for repair or replacement under warranty, the number
of pixel defects on a TFT LCD panel must exceed these
acceptable levels.
1. Definition of Pixels and Sub-pixels
A pixel, or picture element, is composed of three sub pixels in
the primary colors of red, green and blue. Many pixels
together form an image. When all sub pixels of a pixel are lit,
the three colored sub pixels together appear as a single white
pixel. When all are dark, the three colored sub pixels together
appear as a single black pixel. Other combinations of lit and
dark sub pixels appear as single pixels of other colors.
subpixel subpixel
subpixel
R
G
B
Two adjacent lit sub pixels:
Red + Blue = Purple
Red + Green = Yellow
Green + Blue = Cyan (Light Blue)
Three adjacent lit sub pixels
(one white pixel)
A red or blue bright dot must be more than 50
percent brighter than neighboring dots while a
green bright dot is 30 percent brighter than
neighboring dots.
Black Dot Defects
Black dot defects appear as pixels or sub pixels that are
always dark or 'off'. That is, a dark dot is a sub-pixel that
stands out on the screen when the monitor displays a light
pattern. These are the types of black dot defects:
One dark sub pixel
R G
B
Pixel
Two or three adjacent
dark sub pixels
2. Types of Pixel Defects
Pixel and sub pixel defects appear on the screen in different
ways. There are two categories of pixel defects and several
types of sub pixel defects within each category.
R
G
B
P
Y
C
Summary of Contents for 231E1SB/00
Page 12: ...231E1 LCD 12 Wiring diagram ME ...
Page 23: ...231E LCD 23 220EW9 LCD 23 Block Diagram ...
Page 24: ...231E1 LCD 24 Schematic Diagram Scaler Board Power ...
Page 25: ...231E LCD 25 220EW9 LCD 25 Schematic Diagram VGA Input ...
Page 26: ...231E1 LCD 26 Schematic Diagram DVI Input ...
Page 27: ...231E LCD 27 220EW9 LCD 27 Schematic Diagram Scaler Board Scaler ...
Page 28: ...231E1 LCD 28 Schematic Diagram Power Board ...
Page 29: ...231E LCD 29 220EW9 LCD 29 ...
Page 30: ...231E1 LCD 30 ...
Page 31: ...231E LCD 31 220EW9 LCD 31 ...
Page 32: ...231E1 LCD 32 Layout side View Scaler Board 1 ...
Page 34: ...231E1 LCD 34 Layout side View Power Board ...
Page 35: ...231E LCD 35 220EW9 LCD 35 Exploded View ...
Page 43: ...231E LCD 43 General Trouble Shooting Guide ...
Page 45: ...231E LCD 45 Continued 1 ...
Page 47: ...231E LCD 47 General Trouble Shooting Guide ...
Page 48: ...231E1 LCD 48 General Trouble Shooting Guide 5 ...
Page 49: ...231E LCD 49 General Trouble Shooting Guide 6 ...
Page 50: ...231E1 LCD 50 General Trouble Shooting Guide 7 ...
Page 51: ...231E LCD 51 General Trouble Shooting Guide 8 ...
Page 52: ...231E1 LCD 52 General Trouble Shooting Guide 9 ...
Page 53: ...231E LCD 53 General Trouble Shooting Guide 10 ...
Page 54: ...231E1 LCD 54 General Trouble Shooting Guide 11 ...
Page 55: ...231E LCD 55 General Trouble Shooting Guide 12 ...
Page 56: ...231E1 LCD 56 General Trouble Shooting Guide 13 ...
Page 73: ...231E LCD 73 END ...