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LED is a developed technology that is very similar to that of LCD display , except that it has a backlight source as a Light Emitting Diodes (LEDs) . It gives a thinner thickness of the screen and consumes a less amount power . Get an idea for displays also
An LED display consist of mainly pixels and each pixel is divided into many layers
1. Backlight (LED light source)
2. Horizontal polarizer
3. Liquid Crystals
4. Vertical polarizer
5. Light Filter (Red,Green,Blue).
BACKLIGHT
This is basically a light source that provides basic illumination required for the pixel . LED is the light source here
HORIZONTAL POLARIZER
This only allows horizontally polarized light , in simple words , light components oriented in horizontal direction
LIQUID CRYSTALS
This is the part which rotates horizontally polarized light into vertically polarized light by rotating . Angle of rotation is depended on the value supplied to that crystal .
VERTICAL POLARIZER
This filter only allows vertically polarized light to pass through it and blocks rest all components .
LIGHT FILTER
Light filter allows particular light to pass through . like Red filter allows only red light to pass through , similarly green and blue allows respective lights to pass through
Initially when backlight radiates only horizontal component is allowed and light coming out is horizontally polarized when it passes from horizontal polarizer , then light has to pass through liquid crystal and this crystal has property to rotate the polarized light . the amount of rotation of the light depends on the voltage supplied and then light passes through vertical polarizer .
Vertical polarizer only passes vertical components of the light. Say liquid crystal does not rotate the light . Then no light comes out of the vertical polarizer because light has no vertical component . But when light is rotated by say 90degrees then we have all components in vertical direction and the light coming out is maximum . If light is rotated to 45degrees then amount of light coming out is half the incident light . Thus by controlling the amount of rotation, amount of light coming out is controlled .
The variation in the intensity of different lights is done and different amount of RED ,GREEN BLUE lights are allowed to pass through to produce different colors . Say if we want to produce yellow colour then blue colour is not allowed to pass and red and green are allowed in equal amounts so Yellow is produced. Each pixel gives out a color and all the pixels work together to produce wonderful images on the screen .
LED displays have an advantage over LCD , that it consumes lesser power than LCD , gives better display quality , gives thinner displays , but this has higher manufacturing costs
LED is a developed technology that is very similar to that of LCD display , except that it has a backlight source as a Light Emitting Diodes (LEDs) . It gives a thinner thickness of the screen and consumes a less amount power . Get an idea for displays also
An LED display consist of mainly pixels and each pixel is divided into many layers
1. Backlight (LED light source)
2. Horizontal polarizer
3. Liquid Crystals
4. Vertical polarizer
5. Light Filter (Red,Green,Blue).
BACKLIGHT
This is basically a light source that provides basic illumination required for the pixel . LED is the light source here
HORIZONTAL POLARIZER
This only allows horizontally polarized light , in simple words , light components oriented in horizontal direction
LIQUID CRYSTALS
This is the part which rotates horizontally polarized light into vertically polarized light by rotating . Angle of rotation is depended on the value supplied to that crystal .
VERTICAL POLARIZER
This filter only allows vertically polarized light to pass through it and blocks rest all components .
LIGHT FILTER
Light filter allows particular light to pass through . like Red filter allows only red light to pass through , similarly green and blue allows respective lights to pass through
Initially when backlight radiates only horizontal component is allowed and light coming out is horizontally polarized when it passes from horizontal polarizer , then light has to pass through liquid crystal and this crystal has property to rotate the polarized light . the amount of rotation of the light depends on the voltage supplied and then light passes through vertical polarizer .
Vertical polarizer only passes vertical components of the light. Say liquid crystal does not rotate the light . Then no light comes out of the vertical polarizer because light has no vertical component . But when light is rotated by say 90degrees then we have all components in vertical direction and the light coming out is maximum . If light is rotated to 45degrees then amount of light coming out is half the incident light . Thus by controlling the amount of rotation, amount of light coming out is controlled .
The variation in the intensity of different lights is done and different amount of RED ,GREEN BLUE lights are allowed to pass through to produce different colors . Say if we want to produce yellow colour then blue colour is not allowed to pass and red and green are allowed in equal amounts so Yellow is produced. Each pixel gives out a color and all the pixels work together to produce wonderful images on the screen .
LED displays have an advantage over LCD , that it consumes lesser power than LCD , gives better display quality , gives thinner displays , but this has higher manufacturing costs
