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If these connections were to fail, the effect would be that an entire row or column of pixels would fail to activate. TAB faults require replacement of the LCD module itself. while wall-mounting or transporting a display face up/down) or simple failure of the adhesive holding the TAB against the glass. This failure is often caused by horizontally flexing the chassis (e.g. If an LCD is subjected to physical shock, this could cause one or more TAB connections to fail inside the display.
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TAB is one of several methods employed in the LCD-manufacturing process to electrically connect hundreds of signal paths going to the rows and columns of electrodes in layer 6 (the transparent electrode layer) in the LCD to the video integrated circuits (ICs) on the driver board that drives these electrodes. Tape automated bonding fault Ī tape automated bonding fault ( TAB fault) is caused by a connection failure from the TAB that connects the transparent electrode layers to the video driver board of an LCD.
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This allows all light to pass through to the RGB layer, creating a bright white pixel that is always on.Ī partial sub-pixel defect is a manufacturing defect in which the RGB film layer was not cut properly. Note: Must be viewed at full size.Ī bright dot defect or hot pixel is a group of three sub-pixels (one pixel) all of whose transistors are "off" for TN panels or stuck "on" for MVA and PVA panels.
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Hundreds of hot pixels appear in a 32-minute long exposure photograph taken in virtual darkness.