LED TV´s

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by parsonmi
Last updated 5 years ago

Discipline:
Science
Subject:
Technology
Grade:
12

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LED TV´s

LED TV's

How they work...

Advantages:-energy efficient-thin screen and border

Disadvantages:-poor uniformity-hard to project black

Most LED TVs are edge-lit from the sidesfacing inwards towards the screen.

Some LED TVs have LED lights along the back of the screen.

3)How do edge-lit LED TV's work?

Top and Bottom lit

Left and Right lit

All side lit

The LED lights project from the side of the screen (yellow circle) and the light guides (white circles) project the light rays towards the screen. The light guides are taller towards the centre of the TV.

LED: Light Emitting Diode

Direct-lit

5)What is local dimming?

4) How do direct-lit LED TV's work?

7)What's next in the future for LED TV's?

http://www.ehow.com/list_6873245_advantages-led-tv.html

Local dimming increases the contrast of the picture by lighting the correct part of the screen and by turning off completely a dark section.

http://www.rtings.com/info/what-is-local-dimming

http://reviews.cnet.com/8301-33199_7-57572740-221/led-lcd-backlights-explained/

Edge-lit with local dimming

Direct-lit with local dimming

Most LED tvs use only red blue and green LED light. Now the latest version of sharp uses yellow also.

http://www.sharp.ca/en-CA/ForHome/HomeEntertainment/LEDTV.aspx

OLED TVs...

OLED's are organic light emmiting diodes.

OLED TVs are brighter, more energy efficient, thinner, have better refresh rates, have the best picture quality than any other TV, and can potentially be made flexable!

OLEDs are thin films of organic, carbon based materials placed between two conductors. When electrical current is applied, a bright light is created. The OLED TV does not require a backlight because each pixel is a light-emitting diode

http://www.oled-info.com/oled-tv

Curved OLED TV

2)Where are the LED lights located in a TV?

1)First of all, how does a single LED light work?

Direct-lit LED TVs use LED's along the back panel. The LED's then project outwards towards the screen.

As a result, the direct-lit TVs are wider, lack the local dimming feature, but they are cheaper and don't need light guides.

http://www.consumerreports.org/cro/news/2012/05/what-is-a-direct-lit-led-lcd-tv/index.htm

With local dimming

Without local dimming

6)What's new with LED TVs?

4k Ultra HD (UHD):4k Ultra delivers four times the resolution of full HD 1080p.

Please Watchhttp://www.youtube.com/watch?v=8RPwpxZ7J4QTo see a cutaway of an LED LCDTV

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