LCD Resin Printer – Testing Screen

IMG_20160728_185210527

Got the ipad mini 2 screen working. The setup was simple. To output a video signal to the screen a display port controller board is used. I want for a controller board from a site called abusemark.

Controller board – iPad Mini Retina 2048×1536 7.9″ LCD to Mini DisplayPort Adapter 

Board Link:

http://abusemark.com/store/index.php?main_page=product_info&cPath=3&products_id=53&zenid=2fmma8havtm8fpgrcoe99otki1

The board takes a 5v power input and mini display port for the video signal. The ipad screen has a ribbon cable connector which connects to the board. Te board requires a minimum of 0.5A. A mobile supply suited the current supply requirements. The total wattage is 5 * 0.5 = 2.5 watt. Which is a relatively low power usage.

The board uses a STM32F103CB 32-bit Cortex M3 from st microelectronics which can updated through a native USB using the program link below:

Board Programming Software:

http://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/stsw-stm32080.html

The board specs:

  • USB or 5V-powered (separate connector). 0.5A total current draw at max brightness.
  • Mini DisplayPort connector [rev1 update]
  • STM32F103CB 32-bit Cortex M3 MCU with native USB for firmware update and power/brightness/etc control
  • TI TPS61187 WLED driver
  • Buck DC/DC converter for panel power
  • Dimmable/controllable RGB led
  • One push button (power + overloaded function on long press)
  • Firmware upgrade over USB (DFU)
  • 52x34mm PCB
  • Pushbutton can be connected externally, to make it easier to mount inside case/etc.
  • Designed and assembled in Japan

Setup

Creative works software was used to slice and control. A model taken from thingiverse: http://www.thingiverse.com/thing:763622. Was sliced at 100 micron layer height. In creative works you can set the timing for the image exposure, i set it for 6000 milliseconds to allow me to see if the rotation of the stepper motor correlated with the flashing of the screen images.

Preparing Model

IMG_20160728_185225027

You can see from the picture that supports were added to the model.

Image Displayed on Ipad Screen

IMG_20160728_185218091

Image displayed looked very sharp on the screen. It looks blurry since the photo was taken from my camera.

What’s Next

  • Need to finish printing of prototype chassis
  • Assemble and test prototype

 

 

 

 

 

 

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