Philips BDL3210Q Dark Dot Defects, Proximity of Pixel Defects, Pixel Defect Tolerances, Mura

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BDL3210Q / BDL4210Q / BDL4610Q

6.4.Dark Dot Defects

Black dot defects appear as pixels or sub-pixels that are always dark or “off”.These are the examples of black dot defects:

One dark dot

Two adjacent dark dots = 1 pair of dark dots

Two dark dots, specifications defines the minimum distance between dark dots

6.5.Proximity of Pixel Defects

Because pixel and sub-pixels defects of the same type that are nearby one another may be more noticeable, Philips also specifies tolerances for the proximity of pixel defects. In the table below you can find specifications about:

Allowed amount of adjacent dark dots = (adjacent dark dots =1 pair of dark dots)

Minimum distance between dark dots

Total no. of all defective dots

6.6.Pixel Defect Tolerances

In order to qualify for repair due to pixel defects during the warranty period, a PDP / TFT panel in a Philips Plasma / LCD- display must have pixel or sub- pixel defects exceeding the tolerances listed in the following table.

BRIGHT DOT EFFECT

ACCEPTABLE LEVEL

 

 

1 lit sub pixel

2

 

 

BLACK DOT EFFECT

ACCEPTABLE LEVEL

1 dark sub pixel

10

 

 

TOTAL DOT DEFECTS OF ALL TYPES

12

NOTE: * 1 or 2 adjacent sub pixel defects = 1 dot defect

 

6.7.MURA

Dark spots or patches may occasionally appear on some liquid crystal display (LCD) panels.This is known within the industry as Mura, which is a Japanese term for “unevenness.” It is used to describe an irregular pattern or area in which uneven screen uniformity appears under certain conditions. Mura is a result of the deterioration of the liquid crystal alignment layer and is most commonly caused by long-term operation under high ambient temperatures. It is an industry- wide phenomenon and Mura is not repairable. It is also not covered by our warranty terms.

Mura has been around since the introduction of LCD technology and with screens getting bigger and in operation 24/7, many displays are running in low light conditions.This all adds to the possibility of Mura affecting displays.

HOW TO SPOT MURA

There are many symptoms of Mura and also multiple causes. Several of these are listed below:

Impurities or foreign particles in the crystal matrix

Uneven distribution of LCD matrix during manufacturing

Non-uniform luminance distribution of the backlight

Panel assembly induced stress

Flaws within the LCD cells

Thermal induced stress - high temperature operation over long periods of time

HOW TO AVOID MURA

Although we can not guarantee the complete eradication of Mura every time, in general the appearance of Mura can be minimized by these methods:

Lower the backlight brightness

Use a screen saver

Reduce the ambient temperature around the unit

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Contents BDL3210Q BDL4210Q BDL4610Q Know These Safety Symbols Safety InstructionsCE Declaration of Conformity Regulatory InformationFederal Communications Commission FCC Notice U.S. Only Electric, Magnetic and Electronmagnetic Fields EMF Polish Center for Testing and Certification NoticeInformation for U.K. only How to connect a plugChina RoHS 中国电子信息产品污染控制标识要求 中国RoHS法规标示要求 产品中有毒有害物质或元素 的名称及含量End-of-Life Disposal North Europe Nordic Countries InformationWaste Electrical and Electronie Equipment-WEEE VarningTable Of Contents Package Contents Unpacking and InstallationInstallation Notes UnpackingTo install table stands Installing and Removing Table Stands optionalTo remove table stands Mounting on a Wall Control Panel Parts and FunctionsInput/Output Terminals Remote Control HDMI2 HDMI1HDMI3 32 VGA 33 AV1Inserting the batteries in the remote control Connecting External Equipment DVD/VCR/VCD Connecting External EquipmentConnecting a PC Connecting AV Equipment Supported format Connecting USB deviceUSB operation BDL3210Q / BDL4210Q / BDL4610Q Navigating the OSD Menu OSD MenuOSD Menu Overview VGA Resolution BDL3210Q Input ModeSdtv Resolution Hdtv ResolutionPixels and Sub-Pixels Pixel Defect PolicyTypes of Pixel Defects + Dot Definition Bright Dot DefectsProximity of Pixel Defects Dark Dot DefectsPixel Defect Tolerances MuraCleaning Cleaning and TroubleshootingFront Panel Cleaning Instructions Cabinet Cleaning InstructionsSelected input has no connection Display is in standby mode TroubleshootingDisplay Technical SpecificationsInput Terminals Output TerminalsInternal Speaker General