LCDskjermen

LCDskjermen, or LCD screen, is a flat-panel display technology that generates images by modulating light with liquid crystals. In an LCD, liquid crystal molecules are trapped between two polarizing filters. An electric field, applied through drive electronics, changes the orientation of the crystals and thus controls how much light passes through. Since LCDs do not emit light themselves, they require a separate backlight, positioned behind the crystal layer.

Most contemporary LCDs use an active-matrix design with thin-film transistors (TFTs) to address individual pixels. Subtypes such as twisted nematic (TN), in-plane switching (IPS), and vertical alignment (VA) differ in color accuracy, contrast, and viewing angles. Backlighting has evolved from cold-cathode fluorescent lamps (CCFL) to light-emitting diodes (LEDs), reducing power consumption and enabling thinner panels. Some high-end screens employ full-array LED backlighting with local dimming.

LCDs come in a wide range of sizes and resolutions, and are common in computer monitors, televisions, smartphones, and other devices. Typical aspect ratios include 16:9 and 16:10, with resolutions from HD to 4K and beyond. Pixel density, response time, color accuracy, and viewing-angle characteristics are standard specifications used to compare models.

Advantages of LCDskjermen include low idle and active power consumption compared with older display technologies, compact form, and bright, consistent colors when paired with appropriate backlighting. Limitations include potential color and brightness shifts with viewing angle, slower response times on some panels, and historically limited black levels relative to OLED. Lifespan is typically tens of thousands of hours, with backlight wear being a common maintenance consideration.

Environmental aspects include reduced hazardous materials with LED backlights and widespread recycling programs, though earlier LCDs used materials such as mercury in CCFL backlights.