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NEC L1550V Resolution?
I have a flat screen monitor NEC L1550V whose manual says one of its
resolutions is 1024X768. That sounds digital to me. I thought since its only input is VGA that it is analog. ??? Thanks Big Fred |
#2
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NEC L1550V Resolution?
"Frederick" wrote in message
... I have a flat screen monitor NEC L1550V whose manual says one of its resolutions is 1024X768. That sounds digital to me. I thought since its only input is VGA that it is analog. You misunderstood. The manual lists a resolution of 1024X768 pixels, determined by display hardware. It does not matter whether the source signal is analogue or digital. (This reminds us why we need drivers, to interface between the source signal and the monitor's hard-wired circuitry.) -- Don Phillipson Carlsbad Springs (Ottawa, Canada) |
#3
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NEC L1550V Resolution?
Frederick wrote:
I have a flat screen monitor NEC L1550V whose manual says one of its resolutions is 1024X768. That sounds digital to me. I thought since its only input is VGA that it is analog. ??? Thanks Big Fred If you use Monitor Asset Manager (moninfo) from entechtaiwan.com, it shows the resolutions too. This is what my monitor shows (native format being 1280x1024). The program can actually probe the EDID table from the monitor, to get these values. Standard timings supported 720 x 400p at 70Hz - IBM VGA 640 x 480p at 60Hz - IBM VGA 640 x 480p at 67Hz - Apple Mac II 640 x 480p at 72Hz - VESA 640 x 480p at 75Hz - VESA 800 x 600p at 56Hz - VESA 800 x 600p at 60Hz - VESA 800 x 600p at 72Hz - VESA 800 x 600p at 75Hz - VESA 832 x 624p at 75Hz - Apple Mac II 1024 x 768p at 60Hz - VESA 1024 x 768p at 70Hz - VESA 1024 x 768p at 75Hz - VESA 1280 x 1024p at 75Hz - VESA 1152 x 870p at 75Hz - Apple Mac II 1152 x 864p at 75Hz - VESA STD 1280 x 1024p at 60Hz - VESA STD The 1024x768 is a VESA resolution (VESA is a standards body). The "p" stands for progressive, since LCD displays are normally progressive scan for computer monitors. If the letter "i" was there, that would be interleaved, meaning there are odd and even frames being displayed in succession. Interleaved, is what an old television used. There are multiple entries, because the display supports "multisync" and operates at more than one resolution. At the LCD panel itself, it supports only one resolution, the "native" resolution of 1280x1024. There are actually 1280 columns by 1024 rows of pixels, switched on and off. The intensity of a pixel, might be adjustable with a 6 bit or an 8 bit number for each color. The other resolutions are achieved by "scaling" the image to fit the native resolution. The image doesn't look as sharp at the non-native resolution, due to the scaling process. In terms of refresh rates, the panel has limits on that too. One of the sites, perhaps Xbitlabs, claims when operating at a higher refresh rate, the panel throws away "1 in N" frames, to drop the actual refresh rate down to 60Hz. But some modern panels (more modern than mine), support higher refresh rates than that, so may not need to throw anything away. These are the processes possible on the display path. DAC is digital to analog conversion. ADC is analog to digital conversion. Scaling is still needed on the VGA path, because the number of rows of pixels and the number of scan lines, don't match. --- Video card ---- ------ LCD monitor ------ GPU (digital) --- DAC --- analog,VGA --- ADC --- scale --- raw_panel GPU (digital) ----------- digital,DVI ---------- scale --- raw_panel The digital path would be "perfect", if the scaling step could be skipped, and if you select the native resolution value, which in my case is 1280x1024, then no scaling is needed and the scaler disappears from the picture. In the analog path, if you select native resolution, there is still some room for color inaccuracy due to the DAC and ADC steps. But the human eye is so accommodating, you'd hardly notice. ******* Inside the raw_panel, there are more analog processes involved. http://en.wikipedia.org/wiki/TFT_LCD "The column and row wires attach to transistor switches, one for each pixel. The one-way current passing characteristic of the transistor prevents the charge applied to the pixel from draining between refreshes to the display image. Each pixel is a small capacitor with a layer of insulating liquid crystal sandwiched between transparent conductive ITO layers." So there's "lots of digital *and* analog" in that picture. The capacitor for each pixel, holds an analog voltage level. HTH, Paul |
#4
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NEC L1550V Resolution?
Thanks guys.
Big Fred |
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