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20150623 - BenQ XL2730Z Blur Reduction vs CRT
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TFT Central Review for the BenQ XL2730Z
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+The BenQ XL2730Z is one of the best 2560x1440 LCDs on the market.
+This display has a blur reduction mode which
+enables a strobe back-light (which only works properly with fixed 120Hz or 144Hz refresh rates).
+Its sharpness control also enables a reduction of sharpness,
+which can cut out a lot of the hard exact square pixel LCD feel,
+leaving an image which is more pleasing to look at.
+And it provides an exact pixel mode which instead of enlarging lower resolution modes,
+keeps a 1:1 mapping of input to output pixel,
+and draws the outside borders with black.
+So 1920x1080 still looks good, just doesn't fully fill the screen.
+Compared to other LCDs this display is awesome,
+and running with a 1000Hz gaming mouse at 144Hz with a strobe back-light is a wonderful experience
+in comparison to what most people are used to.
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Compared to CRTs?
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+CRTs still easily surpass even these top of the line LCDs in quality.
+One of the core differences is that even the best LCDs
+cannot transition pixels fast enough for a true low persistence display.
+The BenQ for instance has frame cross-talk (seeing part of one or more frames).
+At the default "Area" setting (which controls the vertical position of minimal cross-talk),
+at 144Hz, up to 2 extra frames are partly visible at the top and bottom of the screen,
+however toward the center just 1 extra frame is partly visible.
+I have a feeling that variable cross-talk has to do with the fact that the back-light has to be a global strobe,
+but pixel rows are still scanned (changed) in the classic CRT scan order.
+So row to strobe timing is only best at one point on the screen.
+Likewise the LCD uses a column dither on the transition overdrive,
+even and odd pixel columns over-shoot then under-shoot respectively the transition
+such that the 2 column average is closer to the correct signal.
+The minimal 1 extra frame cross-talk is a product of the lack of ability to transition to the proper signal in one frame.
+This is quite distracting in comparison with the CRT.
+The CRT can easily offer low persistence at much lower frame rates without transition artifacts,
+while providing filtered pixels at a lower resolution while presenting a proper image instead of a lesson in cubism.
+So what would be 2560x1440x120Hz or 442 Mpix/s on the LCD,
+still does not compare to the quality of 1600x1200x76Hz or 146 Mpix/s on the CRT.
+And the CRT can use that 3x GPU performance for higher quality visuals.
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Other Technology?
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+OLED isn't yet cost effective for consumers for desktop displays.
+For example, for $26K it is possible to get a
+Sony BVME250A - 25" Trimaster EL OLED Master Monitor.
+Sony's pro OLEDs seem to max out at 75Hz, not sure they even have a global strobe?
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Prysm sells Laser Phosphor Display (LPD) Tiles:
+CRT like phosphor display driven instead by a laser.
+Each 4:3 aspect ratio tile is a near border-less 20"x15" (25" diagonal) with 320x240 or 427x320 resolution,
+scanned at 360 Hz according to their product sheet.
+I'm guessing these are also prohibitively expensive?
+If this is fixed 360 Hz scanning rate, that would also be a serious problem: a 90Hz input would be quad strobed,
+and that won't look good at all.
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