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Notes of selecting LCD screen

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A, if you only need to display characters and numbers, and the contents of a screen does not exceed the maximum limit of character type liquid crystal (such as 40 x 4), you can choose a character type liquid crystal, directly connected to the MPU can be.
Second, if the need to dynamically display the Chinese characters and graphics, then, can only choose graphic dot matrix liquid crystal, next consider the problem is the need to choose STN (DSTN) monochrome, pseudo color or TFT true color. Under normal circumstances, if the use of single-chip control, due to restrictions on the ability to control the, only in the 640 x 480 monochromatic, 320 x 240 pseudo color range to choose; if the use of PC, IPC or other control ability strong main control module (such as video input control module), as long as have liquid crystal display part or external display control, you can have a greater choice, with built-in controller monochromatic, pseudo color and true color LCD can be. At the same time should take into account the size of the requirements.

Also note that the resolution of LCD is fixed in physics, full screen display generally only with its inherent resolution, this point and CRT somewhat different.
, select the backlight, backlight said and need to from another angle liquid crystal classification, namely transmissive and reflective, semi reflection and semi penetration type liquid crystal, because the liquid crystal as passive luminous display, so must be outside light source, LCD will display, transmission type liquid crystal must add background light, the reflection type liquid crystal need strong ambient light and semi penetration type liquid crystal for high ambient light and backlight.
Character liquid crystal, with the general backlight LED backlight, yellow color (red, green tone). Generally driven by +4.2V.
Monochrome STN small dot matrix LCD, multi use LED or EL backlight, EL backlight to yellow green (red, green, white tone) common. Generally with 400 - 800Hz, 70 - 100V AC drive, commonly used to drive the power of about 1W.
Medium large dot matrix STN LCD and TFT liquid crystal, mostly cold cathode backlight (CCFL/CCFT), backlight color is white (red, green, blue tone). General with 100kHz - 25K, 300V above the AC drive.
Please refer to DC variable AC, low voltage and high voltage inverter .

Four, temperature range, a lot of character type LCD and small graphic dot matrix liquid crystal is at room temperature and wide temperature type, and large graphic dot matrix liquid crystal wide temperature type in the mainland market is relatively rare, room temperature generally refers to operating temperature 0 - 50 DEG C, wide temperature to - 20 - 70 DEG C (individual to minus 30 DEG C, such as LQ5AW136 TFT video interface; also the humidity is also have certain requirements.
Five, the brightness of that unit of luminance for CD / m2 or called nit (NIT) and brightness (DSTN) most of TN and STN liquid crystal does not exceed 100 CD / m2, but now more commonly used 5 - 6 inches of pseudo color STN screen brightness all around 130cd/m2, Kyocera has a 5.7 "LCD brightness over 200cd / m2, and TFT LCD brightness is 150cd/m2 more common, our company also can provide part of the ultra high brightness LCD, brightness up to 1000cd / m2, even 1600cd/m2.
Six, accessories, due to liquid crystal specifications, interface, there is no international standard, so signal interfaces of different manufacturers, different types of liquid crystal are often inconsistent, so the choice of liquid crystal, pay attention to the purchase related accessories (including a signal connection device, inverter, etc.)