Led Matrix: Unterschied zwischen den Versionen
(found some nice setup of ICs for the MetaMatrix) |
(cleanup) |
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For the columns we take almost the same components except that we don|t need the mosfets. the mosfet drivers (which consists of mosfets of course - in fact its a half bridge and so contains one pMOS and one nMOS FET) are strong enough to drive a high current led with a constant current of 0.5A and peak currents of 1.5A | For the columns we take almost the same components except that we don|t need the mosfets. the mosfet drivers (which consists of mosfets of course - in fact its a half bridge and so contains one pMOS and one nMOS FET) are strong enough to drive a high current led with a constant current of 0.5A and peak currents of 1.5A | ||
chips that might be usefull for this | chips that might be usefull for this | ||
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** [http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=analog&familyId=356&uiTemplateId=NODE_STRY_PGE_T TPIC6C595, TPIC6B595, TPIC6A596] all simmilar to the above, ALL switch to ground | ** [http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=analog&familyId=356&uiTemplateId=NODE_STRY_PGE_T TPIC6C595, TPIC6B595, TPIC6A596] all simmilar to the above, ALL switch to ground | ||
** [http://focus.ti.com/docs/prod/folders/print/tps1120.html TPS1120] Dual P-channel Enhancemenent-Mode MOSFET | ** [http://focus.ti.com/docs/prod/folders/print/tps1120.html TPS1120] Dual P-channel Enhancemenent-Mode MOSFET | ||
* On Semi | * On Semi | ||
** [http://www.onsemi.com/PowerSolutions/parametrics.do?id=809 MOSFETs] I think we|ll use one of thes for the rows | |||
** [http://www.onsemi.com/PowerSolutions/parametrics.do?id=809 MOSFETs] | ** [http://www.onsemi.com/PowerSolutions/parametrics.do?id=557 Shifting Registers] cheap :) | ||
** [http://www.onsemi.com/PowerSolutions/parametrics.do?id=557 Shifting Registers] | |||
=== FPGA LED Matrix Controller === | === FPGA LED Matrix Controller === | ||
an FPGA producing the correct signals to drive the above driver module, or drive many modules in paralell :) for each module we need 3pins | an FPGA producing the correct signals to drive the above driver module, or drive many modules in paralell :) for each module we need 3pins | ||
Version vom 3. Juli 2007, 01:36 Uhr
For the LED Matrix we want to build on the CCCamp2007 we decided to design our own LEDMatrix Controller/Driver setup. It will consist of two parts.
LED Matrix Driver Boards
Our Matrix should have a resolution of 48x72 pixels. So there will be 48 rows and 72 columns. The basic building block of our ledmatrix will consist of an 8x8 pixel module (or 8x48 or 8x76 depending on the levels of grayscale steps you want).
for our matrix we need 6x9 = 54 modules.
So how is such basic building block connected? The cathode (GND) pins of all LEDs in each of the 8 rows are connected to each other. Also all the annode (+) pins of all lesds in each column are connected. Sowe get 8 rows and 8 columns. each column intersects each row and the intersections are the leds. To lighten up one specific led we have to set the row the led is connected to to GND and the column to +5V (we also need a resistor to limit the current). TODO: das besser erklaeren rasteransteuerung etc.
The 8 rows are each connected to a powermosfet and are driven to ground one at a time (so the matrix is 8times multiplexed). For driving the mosfets we use 2x Quad-mosfetdriver which in turn are controlled by a 8bit shifting register.
For the columns we take almost the same components except that we don|t need the mosfets. the mosfet drivers (which consists of mosfets of course - in fact its a half bridge and so contains one pMOS and one nMOS FET) are strong enough to drive a high current led with a constant current of 0.5A and peak currents of 1.5A
chips that might be usefull for this
- Texas Instruments
- TPIC6595 8-Bit Power shifting register (250mA continious current per channel)
- TPIC6C595, TPIC6B595, TPIC6A596 all simmilar to the above, ALL switch to ground
- TPS1120 Dual P-channel Enhancemenent-Mode MOSFET
- On Semi
- MOSFETs I think we|ll use one of thes for the rows
- Shifting Registers cheap :)
FPGA LED Matrix Controller
an FPGA producing the correct signals to drive the above driver module, or drive many modules in paralell :) for each module we need 3pins
