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jmig

Cheap LCDs

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I don't know if this will help anybody? However, I noticed in the most recent catalog of All Electronics LCDs that might work as MFDs. On page 85 they have a 256X128 panel for $18.50. It measures 5.8"X4.58" A 640X400 8.25"X5.2" panel is $7.75. They also have several others.You can find them online at www,allelectronics.comJohn

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-> CAT # LCD-103 $ 7.75 each-> CAT # LCD-104 $ 11.00 eachBut how to connect these things to a VGA output (or RGB) ?Maybe it needs a separate custom IC ?-Jerome

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I have taken a look before at these and I'm afraid I'll dissapoint you. The circuitry needed to drive them requires a symmetrical powersupply (or even worse - an assymetrical one) with strange voltage defined by manufacturer, like +8.5V, - 14.5V, +5V plus a driver IC to do the fast line/row transitions (usually in the order of tenths of kilohertz) and a microcontroller to interface it.The driver ICs are only sold in 1000+ quantities, usually in QFTP packages that are SMD and can only be soldered with special equipment. The PCB in order to be small in size has to be a double to six layered one!This is why they are so inexpensive.

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I have bought two of these displays. You cannot directly connect them to your PC video output. I have connected mine to the LPT port and wrote a VB program to drive them. The only problem with this particular display is it does not have a backlight. It is hard to see without a light source directed into it.I have bought other graphic displays that I now use. The have a built in backlight. If you are not electronically inclined I would pass on this type of display.To use these you need various voltages +5v, +12v, and a negative supply -9v to -24v. You can not display video or an RGB signal.I have attached a picture of my setup. The large display on the right side is a 320X200 display with a builtin controller. The second display was not installed yet

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