Liquid Crystal Display on Glass is the newest in LCD technology. The display’s are very compact, it measures 55×27 mm and the height is only 2mm without LED backlight and 5.8mm with LED backlight. The display’s can have different LED background light instead of only the green and blue of the normal LCD modules.There are 5 monochrome colors available: white, green/yellow, blue, red, amber and there is even a full color RGB background possible. The contrast of the display can be set with a command. This is done using software. The display’s series consists of 3 types:
- 3*16 with 3.6 mm character height.
- 2*16 with 5.6 mm character height.
- 1*8 with 12 mm character height.
The display and the corresponding back light are clipped together and inserted into a PCB and soldered.
The display has a build-in character set of 248 European and Japanese characters, in addition you can also define 8 characters. The integrated controller, the ST7036, has build in commands to control the display.
In this project the display is connected to an AVR AT2313 microcontroller.
For the ease of use i have designed a small PCB. The board has two rows of 20-pins socket connectors, in which the display can be inserted, it has also a resistor to limit the current through the background LEDs. For connection with the microcontroller the board has a 5×2-pin connector, so the board can easily connected to the STK500 board or to the AT2313 project board with a 10-pole flat cable. In this project the 4-mode is used so ther are only 4 datalines and 2 control lines.
The software is made in assembler program code. It is made with the Studio4 program wich you can download for free from the Atmel website. Before you can send characters to the display, it has to be initialized. First you have to switch the display to the 4-bit mode.
For more details, click: LCD Display On Glass Interface Using AT2313