FPD-Link: Difference between revisions
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'''Flat Panel Display Link (FPD-Link)''' by National Semiconductor is a high-speed interface connecting the output of a [[video controller]] in a [[laptop]] computer, computer monitor or LCD television set to the [[display panel]]. Most laptops, LCD computer monitors and LCD TVs use this interface internally. (Laptops produced before around 1995 and some devices with much lower display resolutions use a [[Transistor-transistor logic|TTL]] or [[CMOS]] voltage interfaces instead.) |
'''Flat Panel Display Link (FPD-Link)''' by National Semiconductor is a high-speed interface connecting the output of a [[video controller]] in a [[laptop]] computer, computer monitor or LCD television set to the [[display panel]]. Most laptops, LCD computer monitors and LCD TVs use this interface internally. (Laptops produced before around 1995 and some devices with much lower display resolutions use a [[Transistor-transistor logic|TTL]] or [[CMOS]] voltage interfaces instead.) |
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FPD-Link uses [[Low voltage differential signaling|LVDS]], and it was the first large-scale application of the LVDS signaling standard. It uses LVDS on one [[twisted pair]] in order to transmit a clock signal, and on the three or four remaining wire pairs it uses LVDS to transmit video data at a bit rate that is seven times the frequency of the clock signal. Since FPD-Link was the first use of LVDS, many display engineers use |
FPD-Link uses [[Low voltage differential signaling|LVDS]], and it was the first large-scale application of the LVDS signaling standard. It uses LVDS on one [[twisted pair]] in order to transmit a clock signal, and on the three or four remaining wire pairs it uses LVDS to transmit video data at a bit rate that is seven times the frequency of the clock signal. Since FPD-Link was the first use of LVDS, many display engineers use the terms FPD-Link and LVDS synonymously. |
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FPD-Link II is the new version of FPD-Link. The FPD-Link II enhancement embeds the clock signal in the data signal and therefore uses only one differential pair to transmit both the clock and data. |
FPD-Link II is the new version of FPD-Link. The FPD-Link II enhancement embeds the clock signal in the data signal and therefore uses only one differential pair to transmit both the clock and data. |
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Revision as of 21:17, 3 September 2009
Flat Panel Display Link (FPD-Link) by National Semiconductor is a high-speed interface connecting the output of a video controller in a laptop computer, computer monitor or LCD television set to the display panel. Most laptops, LCD computer monitors and LCD TVs use this interface internally. (Laptops produced before around 1995 and some devices with much lower display resolutions use a TTL or CMOS voltage interfaces instead.)
FPD-Link uses LVDS, and it was the first large-scale application of the LVDS signaling standard. It uses LVDS on one twisted pair in order to transmit a clock signal, and on the three or four remaining wire pairs it uses LVDS to transmit video data at a bit rate that is seven times the frequency of the clock signal. Since FPD-Link was the first use of LVDS, many display engineers use the terms FPD-Link and LVDS synonymously.
FPD-Link II is the new version of FPD-Link. The FPD-Link II enhancement embeds the clock signal in the data signal and therefore uses only one differential pair to transmit both the clock and data.
Other systems
Automotive infotainment displays are another application that started using FPD-Link. Now many of the infotainment applications are using FPD-Link II to take advantage of the benefits provided by the embedded clock signal; one being the reduce cable size and weight due to the single wire pair for all the data and the clock.
There is another display interface which uses LVDS: OpenLDI. It is based on FPD-Link, but allows longer cable lengths, and is a rarely used method to connect external display panels to computers. Modern stand-alone LCD display panels for desktop computers use a completely different interface such as DVI.
External links
- An Introduction to FPD Link
- LVDS Display Interface (LDI) TFT Data Mapping for Interoperability with FPD-Link
- LVDS based FPD-Link spans industries with gigabits @ milliwatts – detailed description of the interface
- FPD-Link II Display SerDes Overview
See also
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