Image-1b RGB Everywhere
Here is a few more examples of RGB in daily life.
RGB
- Key RGB fact:
- Make any color with a mixture of red/green/blue lights
LCD Display
- LCD - "Liquid Crystal Display" is a very common type of display
- Those typical gray back with black letter displays
- May or may not have a light source
- e.g. a calculator, digital thermostat
- Small voltage flips a layer between clear and black/opaque
- These are cheap and use little power
Pixels In Real Life - DPI - Retina
- Historically, displays had 70-100 dots-per-inch (dpi)
- 100 dpi looks good, more is better but with diminishing returns
- e.g. my laptop display is 1440 pixels wide, and 11.5 inches
1440 / 11.5 = 99.1 dpi
- The trend has been for pixels to get smaller, i.e. larger dpi
- Apple "retina" term, 300 dpi, claimed beyond the limit of human vision
LCD Color Display
- To make color:
1. Have a white backlight
2. 1 pixel = areas with red/green/blue filters covered with LCD material
3. Adjust the LCD opaqueness for each pixel to vary the RGB lights
Demo!
Here is the flowers image:
And here is a picture of my 99 dpi display of the rightmost flower:
AMOLED Display
- Another way is to have tiny LEDs (recent tech)
active-matrix organic light-emitting diode
- Brighter
- Problem: LEDs can dim with use
- e.g. "blue" gets used up first .. things don't look quite right
- AMOLED (wikipedia)
- Don't need to make RGB elements all the same size
RGB Digital Camera Sensor
- Bayer (wikipedia) digital camera sensor pattern
- There's more green than red or blue, more close to the human vision system
RGB Human Vision