Liquid crystal displays and modules classification

First, the color classification: monochrome and color. Monochrome classification are:
(1) twisted nematic type (TN): The type low voltage, the viewing angle is small, black and white display, low cost and price.SPI LCD
(2) ultra-distorting effects of type (STN): This type of perspective than the TN type, operating voltage slightly higher, mostly green and yellow background or blue background, the cost price is higher than TN type.

Second, from the display:
(1) Just as the display: the display dark on a light background, such as: yellow and green screen, yellow-green, font black
(2) a negative image: dark background Mr. light, such as blue screen, blue background, white font.

Third, from the functional:
(1) segment: only display numbers and characters,i2c lcd
(2) Character: You can only display numbers, letters,
(3) graphics: only display graphics and numbers and letters,
(4) Chinese graphic: Chinese, numbers, graphics, letters, and a built-in Chinese standard Chinese character.