Search found 66 matches

by blargg
29 Dec 2014, 16:35
Forum: Input Lag / Display Lag / Network Lag
Topic: Inherent click delay found in mice.
Replies: 47
Views: 47459

Re: Inherent click delay found in mice.

This part is what threw me off: In mice, debounce has to be of the "call state stable after Xms" type as opposed to the "call state unstable for Xms after event" type sometimes found in keyboards. I interpreted this as the mouse waiting until it gets multiple like reads of the button before reportin...
by blargg
29 Dec 2014, 14:00
Forum: Input Lag / Display Lag / Network Lag
Topic: Inherent click delay found in mice.
Replies: 47
Views: 47459

Re: Inherent click delay found in mice.

Debounce doesn't have to delay the initial pressed status, and if the button is held by the user for more than 10-20ms, then release doesn't have to be delayed by debounce either. In both cases, the controller waits for a button state change, immediately reports it, and then ignores changes for 10ms...
by blargg
22 Dec 2014, 17:33
Forum: General — Displays, Graphics & More
Topic: Laser projectors general? [zero lag & zero blur!!!]
Replies: 241
Views: 227114

Re: Laser projectors general? [zero lag & zero blur!!!]

As I understand it, VGA, DVI, HDMI, DisplayPort, etc. all send the image in the usual scanline fashion, thus there is no need for any lag for any format. The display buffer size determines lag. If it only buffers one scanline at most, then added display lag is at most a fraction of a millisecond. Pa...
by blargg
22 Dec 2014, 14:30
Forum: General — Displays, Graphics & More
Topic: Laser projectors general? [zero lag & zero blur!!!]
Replies: 241
Views: 227114

Re: <

I imagine that a multi-faceted (e.g. polygonal) mirrored spinning cylinder would easily be able to scan a laser beam back and fourth 135,000 times a second while spinning far more slowly. i'm not so sure about the "far more slowly" part. even with a six sided prism/mirror you'd need 135000/6 = 2250...
by blargg
16 Dec 2014, 12:17
Forum: Area 51: Display Science, Research & Engineering
Topic: Pixel behaviour in sample and hold, in unchanging image.
Replies: 24
Views: 22206

Re: Pixel behaviour in sample and hold, in unchanging image

The alternating polarity is to avoid migration of the ionic substances to one electrode and damage as a result (electroplating).
by blargg
16 Dec 2014, 01:30
Forum: Area 51: Display Science, Research & Engineering
Topic: Pixel behaviour in sample and hold, in unchanging image.
Replies: 24
Views: 22206

Re: Pixel behaviour in sample and hold, in unchanging image

My obvious google search found something describing TN operation that makes sense. My understanding of that page: Normally the crystals form a twist, which twists the polarization of the light. When a field is applied, the crystals align end-to-end between the two electrodes, eliminating the polariz...
by blargg
15 Dec 2014, 14:29
Forum: Area 51: Display Science, Research & Engineering
Topic: Pixel behaviour in sample and hold, in unchanging image.
Replies: 24
Views: 22206

Re: Pixel behaviour in sample and hold, in unchanging image.

There's a stepped behavior in LCD response. Each voltage pass (LCD scanout) is a kick of momentum that pushes the LCD pixel closer to its final color value. Doesn't the LCD hold the voltage between passes? What causes there to be a kick each pass if the same voltage is held each time? Perhaps the a...
by blargg
13 Dec 2014, 14:43
Forum: BENQ Zowie Tweaking — Strobe Utility / Blur Reduction / DyAc
Topic: XL2411Z V2, my findings so far [settings, VT1500 trick, etc]
Replies: 120
Views: 160170

Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Higher VT allows a longer strobe without increasing top/bottom LCD artifacts, so in a way it makes things brighter. It doesn't of course mitigate the inherent tradeoff between strobe length and eye-tracking-induced motion blur (only higher LED backlight current can escape this tradeoff).
by blargg
12 Dec 2014, 21:59
Forum: General — Displays, Graphics & More
Topic: Laser projectors general? [zero lag & zero blur!!!]
Replies: 241
Views: 227114

Re: Laser projectors general?

Laser technology also seems such that it's quite approachable by the hobbyist. You need some laser diodes, a brightness modulator circuit (high bandwidth so perhaps tricky), an X/Y mirror (also pretty high speed), and an FPGA and CPU combination for the controlling software. It's nothing like trying...
by blargg
12 Dec 2014, 21:54
Forum: Offtopic Lounge
Topic: Motion blur in old photography - long exposures 19th century
Replies: 3
Views: 8923

Re: Motion blur in old photography - long exposures in 1800s

Oh nice, this sets up a continuum between that image above of the eerily empty city, and a monitor with strobing. As the strobe gets longer, things get blurry (more faint at the edges). As persistence lengthens, the blurry edge consumes the object and thus the whole object gets more faint. Keep incr...