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Passive matrix displays are a low-cost form of LCD that were used widely when color displays were first appearing on mobile phones. They have been replaced by newer TFT LCD technologies that, while more expensive, offer far superior performance. Passive matrix displays tend to look washed out when compared to their active matrix cousins. The most common type of passive matric technology is STN.

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Q: What is the concept of Passive-matrix and active-matrix addressed LCDs Briefly write down how is the LCD in a laptop computer so bright?
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