Latest LCD displays are backlit by LED diodes, in that case LCD connector have special input for LED power, usually along with BL(on/off) and ADJ(dimming) control if screen include LED driver, elsewhere there are only raw LED wires and we need to use external LED driver. Here we have CCFL lamps, those are driven by piece of electronic named CCFL High Voltage driver, usually controlled by BL(on/off) and ADJ(dimming) control, and powered usually by 12V-20V. It is not all, another important for LCD is supply power Voltage, most of screens works at 3.3V but there are some 5V and even 12V.īut it is not all, there is also backlight, it is ambient light behind the TFT screen, that made picture visible for us. Usually, GND pins are 'fingerprint' of type of cable we must use.

Many times you can use datasheet of similar display and then check for example positions of GND(using multimeter) to be sure, that order of signals are identical. Signals always should be check with datasheet of particular display. The same differences are for all types of connectors, like 14, 20, 30, 40 or other pin sockets. Unfortunate, various screens have various LVDS hardware connectors, like 14, 20, 30, 40 pins and various shapes.įor example 20 pins connectors can look different and use different sockets, but signal pin assignment is the same in both of them.Īlso for example, the same looking 20 pin socket in two displays, could have completely different signals at the same pin's numbers, they are scrambled in different way. In each LVDS pair exist Positive(+) and Negative(-) wire, and those Positive and Negative must match in LCD socket and controller socket for proper work. In short, LVDS is low cable count connection type, made as twisted pairs of data R G B (red, green, blue) plus clock data.

įor those who want to know better - please read this WikipediaĪlmost all modern laptop's (and monitor's) screens are LVDS types, it is type of serial connection to data source. Some words about LVDS interface to LCD TFT screens.

8bit single chanel lvds screen spec