LCD overview Sample Clauses

LCD overview. Liquid crystal displays (LCD) are the most commercialized type of electronic displays. In the last decade, LCDs mainly used cold cathode fluorescent (CCFL) tubes as a backlight system. However, CCFL technology has progressively being replaced by light emitting diodes (LED) due to the lower efficiency and quality of the image as well as the absence of mercury, a substance catalogued as hazardous by the RoHS directive14 which is the main depollution for screen flow (see part 3.3). Besides the change of the type of backlight, the general structure of the electronic displays has been maintained. Although there is a large variety in the design of electronic displays, generally the main parts included are: - a front cover and a plastic frame - a main printed circuit board (PCB) - speakers - an inverter board - a switched mode power supply (SMPS) board and a timing controller (TCON15) All are assembled to a steel sheet, and the screen which contains the backlight system. Other parts can include connections (such as cables and thin films), secondary PCB, fans (optional), and several different frames and supports. The place of the backlight system varies for each type of screen. Generally, in CCFL screens, the backlight is placed behind the screen, whereas the backlight is on the side of the screen for LED. Below is a description of these two technologies. Figure 6: Parts of typical CCFL and LED screen (Perspex is PMMA). Adapted from Xxxx et al. (2013) 14 Analysis of material efficiency aspects of Energy related Product for the development of EU Ecolabel criteria - Product groups: personal computers and electronic displays, JRC (2016), page 40 15 One of the main causes of screen breakdown, together with the capacitor of the PCB and the LED diodes
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