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Фрагмент инструкции
This notice explains the different types of pixel defects and defines the acceptable defect level for the BDL4230E LCD screen. In order to qualify for repair under warranty, the number of pixel defects must exceed a certain level as shown in the reference table. If the LCD screen is within specification a warranty exchange / claim back will be refused. Additionally, because some types or combinations of pixel defects are more noticeable than others, Philips sets even higher quality standards for those. 6.1. Pixels and Sub-Pixels subpixelpixel 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. 6.2. Types of Pixel Defects + Dot Definition Pixel and sub-pixel defects appear on the screen in different ways. There are three categories of pixel defects and several types of sub-pixel defects within each category. Dot definition = What is a defective “Dot”? : One or more defective, adjacent sub-pixel are defined as one “dot”. The no. of defective sub-pixels are not relevant to define a defective dot. This means that a defective dot can consist of one, two or three defective sub-pixels which can be dark or lit. RRGB One dot = One Pixel; consists of three sub-pixels of Red, Green, and Blue. 6.3. Bright Dot Defects Bright dot defects appear as pixels or sub-pixels that are always lit or “on”. These are the examples of bright dot defects: One lit red, green or blue sub pixel Two adjacent lit sub pixels: Red + Blue = Purple Red + Green = Yellow Green + Blue = Cyan (Light Blue) Three adjacent lit sub pixels (one white pixel) 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 7. Cleaning and Troubleshooting 7.1. Cleaning Caution When Using the Display • Do not bring your hands, face or objects close to the ventilation holes of the display. The top of the display is usually very hot due to the high temperature of exhaust air being released through the ventilation holes. Burns or personal injuries may occur if any body parts are brought too close. Placing any object near the top of the display could also result in ...
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