LCD lvds interface, change screen line, point screen - appliance repair - Huaqiang Electronic Network

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The most difficult thing to do with the dot screen is the screen interface circuit. It is very simple like a backlight circuit. The general backlight board only needs 3 lines. The brightness adjustment can be ignored, that is, the power, ground, and backlight turn-on signals are all right. Most of them are high level


LVDS interface is developed in TTL

Take a single six-digit TTL interface as an example. At least 20 lines are required. In addition to the power line, there are three primary color signal lines, R0~R5, G0~G5, B0~B5, and line-synchronous HS, VS, and data enable. DE clock CLK, etc., the number of screen lines is large, and it is easy to be interfered, so it is not a lot now. Most of the current LCD screens are LVDS interfaces.

LVDS is a low-dropout signal with a signal level of about 1v. It is usually a single row. It is usually 20-pin and 30-pin. Its data is paired.

Common digits are single 6 digits, letter D6L, SI6L means single 8 digits, letter D8L, SI8L means double 6 digits, letter S6L, D06L means double 8 digits, letter S8L, D08L


Screen power supply voltage is generally 3.3V, 5V and 12V, generally 15 inch and below screen power supply is 3.3V, 17 inch ~ 24 inch is generally 5V, 26 inch has 5V also has 12V, 26 inch or more is generally 12V, but there are exceptions, This is only the majority. When you use the screen to match the board, you should not easily try to jump the 12V screen power supply. Otherwise, it may make you unforgettable for life.

So how to distinguish this screen interface is single 6, single 8, or double 6, double 8, it is determined by its twisted pair, single 6 by 4 pairs of twisted pairs, single 8 with 5 pairs of twisted pair Line, double 6-bit with 8 twisted pairs, double 8-bit with 10 pairs of twisted pairs, single 6-bit 4 pairs of twisted pairs with 3 pairs of data lines and 1 pair of clock lines, single 8-bit 5 pairs of twisted pairs There are 4 pairs of data lines and 1 pair of clock lines, 8 pairs of 6 pairs of twisted pairs have 6 pairs of data lines and 2 pairs of clock lines, and 8 pairs of 8 pairs of twisted pairs have 8 pairs of data lines and 2 pairs of clock lines. .

Generally, the stocking is on the order of eight digits, because the single eight-digit screen line can be easily changed into a single six-digit, and the last pair of data lines can be reduced. If the single-digit six-digit is changed to eight, it is more difficult. If there is no suitable screen line at hand, it should be solved by changing the screen line. The order of changing the screen line is double 8 to double 6, double 6 to single 8 and single 8 to single 6. Be sure to pay attention to the pin position. Wrong, the general circuit board has a logo


If the original screen line is the kind of flat cable, it can also be identified by the logic board interface circuit. The power supply + needless to say, most of them are connected with a fuse resistor, the ground wire is not said, everyone knows, Connecting large areas of copper foil, data and clock are also well recognized, they are basically adjacent, and both enter the chip through a pair of small resistors, and each pair of data lines or clock lines have a resistance of 100 ohms. Nearby, so by counting the logarithm of the small resistance connected to the screen interface, you can also know that this screen is a few.

Do not only understand the definition of the screen interface, but also the connection of the data line, the ground line and the power supply line. It is necessary to figure out the resolution of the screen and the size of the screen. Important resolutions are right, some sizes are not important


Generally, as long as the screen line is connected correctly, the screen resolution of the motherboard program, the number of digits, suitable, most of them can be lit, but it is lit, and the program is not suitable. It should be considered in many aspects, such as characters, button functions, etc. If not, change the program again.

The above is my ignorance, I hope that my peers will not laugh, there are mistakes, welcome to correct me.