LCD and LED
Liquid Crystal Display (LCD) and Light Emitting Diode (LED) are two major display technologies used in modern devices. LCDs use liquid crystals, sandwiched between two layers of glass, to form images by manipulating the alignment and transparency of the crystals. LED displays utilize diodes that emit light when electricity passes through them. LEDs can be used as backlighting for LCD panels, or create images directly on an LED matrix. Some benefits of these technologies include energy efficiency, compact size, and higher refresh rates compared to older display technologies like CRT.
Guide on LCD and LED for CompTIA A+ Exam
Importance:
LCD and LED technologies form a dominant part of the display technologies in the current technical landscape. Understanding these technologies are essential for the CompTIA A+ exam as they are invariably present in almost all modern devices.
What is LCD and LED:
LCD, stands for Liquid Crystal Display, and LED, stands for Light Emitting Diode, are types of display technologies. LCDs make use of liquid crystals to form images, whereas LEDs use diodes that emit light when current is applied.
How it Works:
In an LCD, light is projected on the liquid crystal cells which rotates the light to form images. In an LED, the diodes emit light when current passes through them. The colors are formed by combining different intensities of red, blue, and green light.
Exam Tips:
1. Understand the fundamental differences between LCD and LED technology.
2. Grasp how brightness, resolution, and contrast ratios can affect the quality of these displays.
3. Learn key terms associated with each technology.
4. Be familiar with the common problems associated with LCD and LED, and how to troubleshoot them.
Remember, real-world experience and understanding is as critical as textbook knowledge for the CompTIA A+ exam. Therefore, garner practical experience wherever possible in dealing with these technologies.
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