Difference between revisions of "RPi Screens"

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m (Removed one "no longer available" item)
m (VGA/RGB analog)
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* [http://www.ebay.de/itm/New-HDMI-Male-to-VGA-RGB-Female-HDMI-to-VGA-Video-Converter-adapter-1080P-for-PC-/140625458879?pt=LH_DefaultDomain_0&hash=item20bdee36bf $24.00 "Video Converter adapter" from china]
 
* [http://www.ebay.de/itm/New-HDMI-Male-to-VGA-RGB-Female-HDMI-to-VGA-Video-Converter-adapter-1080P-for-PC-/140625458879?pt=LH_DefaultDomain_0&hash=item20bdee36bf $24.00 "Video Converter adapter" from china]
 
* [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] requires additional miniHDMI to standard HDMI adapter
 
* [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] requires additional miniHDMI to standard HDMI adapter
 +
* [http://www.dealextreme.com/p/hdmi-to-vga-video-converter-71816 $32.50 HDMI to VGA Video Converter]
 
* [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]
 
* [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]
 
* [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]
 
* [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]

Revision as of 13:12, 2 February 2012


RaspPi.png Back to the Hub


Hardware & Peripherals:

Hardware - detailed information about the Raspberry Pi boards.

Hardware History - guide to the Raspberry Pi models.

Low-level Peripherals - using the GPIO and other connectors.

Expansion Boards - GPIO plug-in boards providing additional functionality.

Screens - attaching a screen to the Raspberry Pi.

Cases - lots of nice cases to protect the Raspberry Pi.

Other Peripherals - all sorts of peripherals used with the Raspberry Pi.


Supported Standards

The following display outputs are supported on the board:

  • Composite video (NTSC and PAL) via an RCA plug (the yellow socket on your TV) or SCART socket.
  • HDMI 1.3a standard output.
  • Display Serial Interface (DSI) - via unpopulated 15-way flat flex connector.

These interfaces allow the use of a broad range of displays, including:

  • Televisions (HDMI or composite).
  • Computer monitors (HDMI/DVI-D cable) (VGA monitors would require either a composite or HDMI to VGA or component scan converter box).
  • DLP/Laser Pico Projectors (HDMI/DVI-D cable).
  • RAW LCD panels (DSI + interfacing hardware)
  • Composite and HDMI outputs can not be used at the same time (one or the other.)

HDMI

Directly from the board.

DVI

With an inexpensive passive HDMI to DVI-D cable or convertor.

Composite video

Composite video (NTSC and PAL) via an RCA plug, directly from the board.

VGA/RGB analog

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.

A couple of options for VGA or component RGB outputs, bridging from either HDMI or the MIPI DSI interface:

Firstly, the following *might* work. Beagleboard people have reported various levels of success (mainly "issues"):

http://www.hdfury.com/

Something similar:

http://www.fit-pc.com/web/fit-pc2/accessories/fit-vga/

...it may need to be modified as described here:

http://blog.galemin.com/2011/03/dvi-d-to-vga-converter-for-beagleboard-xm/

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:

http://boardzoo.com/product_info12.php

Some more converters that should work:

Potential RGB interfacing chips:

They emit Hsync, Vsync and RGB w/ about 8 bits each (sometimes, it's called "MIPI DPI")

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. Additional componenty would be needed to generate RGB signals. Additional componentry would push the price beyond the $25 target and therefore won't happen.

interfacing to Raw LCD panels

Nokia N900 has 800x480 DCS LCD (afaik its like DSI, but has build in framebuffer). Replacement screen is about ~$40 (~$50 with 4pin resistive touchscreen).

Nokia N8 has AMOLED 360x640 pixels DSI LCD. Replacement screen is about ~$35, another ~$25 for Multitouch Synaptics T1021A touchscreen (I2C + interrupt IO, no docs/drivers).

The schematics for apples iPhone 3gs and 4g suggest they speak DSI, thus they can probably be connected directly. The older iPhones use a "Mobile Pixel Link" connection from National Semiconductor. The 3GS panel (480×320) goes as low as US $14.88, while the 4G one (960×640) can be had for US $17.99.

Other panels with MIPI DSI: www.panelook.com

Potential LVDS interfacing chips:

TC358764/5 Display Bridge (MIPI® DSI to LVDS)

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)


I2C/SPI ADC can be used to interface 4 pin resistive Touch Screens, For example STMPE812A. Texas Instruments has a solution for 4 or 8 wire touchscreens using their rather cheap MSP4309.


16x2 LCD Displays

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.

References