RPi Screens
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.)
Contents
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"):
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:
- $24.00 ASUS - Video adapter
- $27.77 HDMI Male to VGA RGB Female Video Converter
- $39.99 HDCP HDMI to VGA + SPDIF RGB Component Ypbpr Converter
- $48.00 HP HDMI to VGA Display Adapter
Potential RGB interfacing chips:
They emit Hsync, Vsync and RGB w/ about 8 bits each (sometimes, it's called "MIPI DPI")
- Toshiba TC358762XBG deserializer bridge chip
- Analog Devices HDMI Receivers
- Renesas µPD60800 Intelligent Buffer IC
- Renesas µPD60801 Intelligent Buffer IC
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).
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
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
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