Page 180 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

6 Long Lifespan: LCD TVs have a relatively long lifespan compared to CRT TVs, with many models lasting for
several years with proper maintenance and care.

Disadvantages of LCD TV
1 Limited Contrast Ratio: LCD TVs typically have lower contrast ratios compared to plasma or OLED TVs,
which can result in less dynamic and vibrant images, especially in dark scenes.

2 Motion Blur: Some LCD TVs may experience motion blur, especially in fast-paced action scenes, due to
slower response times of liquid crystal displays.
3 Limited Color Reproduction: While modern LCD TVs offer excellent color reproduction, they may not match
the deep blacks and rich colors produced by OLED or plasma displays.
4 Potential for Backlight Bleeding: LCD TVs may suffer from backlight bleeding, where light leaks around the
edges of the screen, leading to uneven brightness and reduced image quality, especially in dark scenes.

5 Limited Viewing Angles: While viewing angles have improved, LCD TVs still have limitations compared to
OLED and plasma displays, with color and contrast degradation when viewed from extreme angles.
6 Risk of Dead Pixels: LCD TVs are susceptible to dead pixels, where individual pixels on the screen may
become stuck or permanently off, affecting image quality.
The comparison between LCD and LED
The comparison between LCD (Liquid Crystal Display) and LED (Light Emitting Diode) TVs can be a bit nuanced
since LED TVs are essentially a subset of LCD TVs. Here’s a breakdown of the differences and similarities
between the two
LCD TVs
1 Backlighting: LCD TVs use a cold cathode fluorescent lamp (CCFL) or LED backlighting to illuminate the
liquid crystal display panel. The backlight provides the light source for the display.
2 Energy Efficiency: LCD TVs with LED backlighting are generally more energy- efficient compared to those
with CCFL backlighting. LED backlighting consumes less power and allows for thinner designs.

3 Thickness: LCD TVs with CCFL backlighting tend to be thicker compared to LED- backlit LCD TVs. LED
backlighting allows for slimmer designs and lighter weight.
4 Picture Quality: LCD TVs can offer good picture quality, but it may vary depending on factors like backlighting
technology, panel quality, and image processing capabilities.
5 Viewing Angles: Traditional LCD panels can have limitations in viewing angles, with color and contrast
degradation occurring when viewed from extreme angles.
LED TVs
1 Backlighting: LED TVs use light-emitting diodes (LEDs) as the backlight source. They are placed either
behind the entire screen (direct-lit) or around the edges (edge-lit) to illuminate the LCD panel.

2 Energy Efficiency: LED TVs are generally more energy-efficient than traditional LCD TVs with CCFL
backlighting. LED backlighting consumes less power and produces less heat.
3 Thickness: LED TVs are typically thinner and lighter compared to LCD TVs with CCFL backlighting. LED
backlighting allows for slimmer designs and more flexibility in form factor.
4 Picture Quality: LED TVs often offer better picture quality compared to traditional LCD TVs. They can achieve
higher brightness levels, better contrast ratios, and improved color accuracy.
5 Local Dimming: Some LED TVs feature local dimming technology, which allows certain areas of the backlight
to dim or turn off completely to enhance contrast and improve black levels.
Comparison
• LED TVs are essentially a type of LCD TV. The main difference lies in the backlighting technology.
• LED TVs generally offer better energy efficiency, thinner designs, and improved picture quality compared to
traditional LCD TVs with CCFL backlighting.

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CITS : E & H - Electronics Mechanic - Lesson 100 - 107