Difference between revisions of "Rpi Screens"

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[[Category: RaspberryPi]]
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#REDIRECT [[RPi Screens]]
The following display outputs are supported on the board:
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* Composite video (NTSC and PAL) via an RCA plug. (the yellow plug on your tv)
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* HDMI 1.3a standard output.
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* Display Serial Interface (DSI) - via unpopulated 15-way flat flex connector.
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These interfaces allow the use of a broad range of displays, including:
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* Televisions (HDMI or composite).
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* Computer monitors (HDMI/DVI-D cable) (VGA monitors would require either a composite or HDMI to VGA scan converter box).
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* DLP/Laser Pico Projectors (HDMI/DVI-D cable).
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* RAW LCD panels (DSI + interfacing hardware)
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* Composite and HDMI outputs can not be used at the same time (one or the other.)
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==HDMI==
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Directly from the board.
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==DVI==
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With a passive HDMI to DVI convertor or cable.
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==Composite video==
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Composite video (NTSC and PAL) via an RCA plug, directly from the board.
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==VGA==
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The Broadcom BCM2835 only provides HDMI output and composite output. RGB and other signals needed by RGB, S-VIDEO or VGA connectors are however not provided.
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A couple of options for VGA or component RGB outputs, bridging from either HDMI or the MIPI DSI interface:
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Firstly, the following *might* work. Beagleboard people have reported various levels of success (mainly "issues"):
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[http://www.hdfury.com/ http://www.hdfury.com/]
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Something similar:
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[http://www.fit-pc.com/web/fit-pc2/accessories/fit-vga/ http://www.fit-pc.com/web/fit-pc2/accessories/fit-vga/]
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...it may need to be modified as described here:
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[http://blog.galemin.com/2011/03/dvi-d-to-vga-converter-for-beagleboard-xm/ http://blog.galemin.com/2011/03/dvi-d-to-vga-converter-for-beagleboard-xm/]
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Alternatively, it may be possible to design an expansion board that plugs into the LCD headers on the R.Pi. Here is something similar for Beagleboard:
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[http://boardzoo.com/product_info12.php http://boardzoo.com/product_info12.php]
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Some more converters that '''should''' work:
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[http://www.google.com/products/catalog?q=hdmi+to+vga+converter&hl=en&show=dd&cid=4579096882877853234&ei=V8cGT5XtHoim-gbO5YSYAQ&ved=0CCUQ8wIwBDgK#scoring=p $24.00 ASUS - Video adapter]
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[http://www.ebay.com/itm/HDMI-Male-VGA-RGB-Female-Video-Converter-adapter-Cable-PC-HDTV-PS3-1080P-/150731861202?pt=LH_DefaultDomain_0&hash=item231851acd2 $27.77 HDMI Male to VGA RGB Female Video Converter]
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[http://www.amazon.com/SPDIF-Component-Ypbpr-Converter-v1-3b/dp/B002SFT3ZI/ref=cm_cr_pr_product_top $39.99 HDCP HDMI to VGA + SPDIF RGB Component Ypbpr Converter]
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[http://www.google.com/products/catalog?q=HP+HDMI+to+VGA&oe=utf-8&rls=org.mozilla:en-GB:official&client=firefox-a&um=1&ie=UTF-8&tbm=shop&cid=4243749406268537354&sa=X&ei=mH0JT5jWHIuO4gS0h6ndCw&ved=0CDkQ8wIwAA $48.00 HP HDMI to VGA Display Adapter]
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*The SOC(system on a chip) does not support any kind of analog component video, including VGA, since the SOC is designed for mobile phone use where this would not be a requirement.
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*Additional componenty would be needed to generate RGB signals. Additional componentry would push the price beyond the $25 target and therefore won't happen.
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==interfacing to Raw LCD panels==
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Nokia N900 has 800x480 DCS LCD [http://e-ditionsbyfry.com/Olive/ODE/ECN/default.aspx?href=ECN%2F2009%2F08%2F02&pageno=5&entity=Pc00502&view=entity (afaik its like DSI, but has build in framebuffer)].
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Replacement screen is about ~$40 (~$50 with 4pin resistive touchscreen).
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Nokia N8 has AMOLED 360x640 pixels DSI LCD.
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Replacement screen is about ~$35, another ~$25 for Multitouch Synaptics T1021A touchscreen (I2C + interrupt IO, no docs/drivers).
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Potential LVDS interfacing chips :
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[http://www.toshiba-components.com/mobile/data/Toshiba_TC358764_65XBGA.pdf TC358764/5 Display Bridge (MIPI® DSI to LVDS)]
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[http://e2e.ti.com/cfs-filesystemfile.ashx/__key/CommunityServer-Discussions-Components-Files/130/3252.DVI_3B00_HDMI_2D00_to_2D00_LVDS-Bridge-Application-Note.doc DVI receiver TFP401A, TFP403, or TFP501 + LVDS transmitter SN75LVDS83B or SN65LVDS93A] (Mentioned earlier fit-VGA is build around TFP401A, probably many more "active" DVI2VGA cables are build the same way) 
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I2C/SPI ADC can be used to interface 4 pin resistive Touch Screens, For example [http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00291197.pdf STMPE812A]
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===16x2 LCD Displays===
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The old-style 2-line, 16-character LCD displays can be commonly controlled over UART, thus providing a cheap way to display values for sensors etc.
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==References==
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<references/>
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Latest revision as of 20:20, 28 January 2012

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