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Search: Keyword(s): ; Posts Made By: xrox
Forum: OLED Technology and Flat Panels General   11-21-2015, 11:47 PM
Replies: 37
Views: 3,494
Posted By xrox
The rise time of PDP phosphors is ultra fast in...

The rise time of PDP phosphors is ultra fast in the blue but a little laggy in the yellow and green IIRC. The slow fall time you speak of has nothing to do with PWM noise (I don't even know what...
Forum: OLED Technology and Flat Panels General   11-08-2015, 08:27 AM
Replies: 13,157
Views: 1,240,304
Posted By xrox
The statement was referring to the larger blue...

The statement was referring to the larger blue subpixel with lower current density (not the 90% example). Viewing up close the subpixel will look dimmer. From a far the display will not look any...
Forum: OLED Technology and Flat Panels General   11-08-2015, 12:28 AM
Replies: 13,157
Views: 1,240,304
Posted By xrox
Just confusion. I read that you were making...

Just confusion. I read that you were making conclusions about the subpixel as an extended source and applying that towards what the average viewer sees.

I don't agree. I think we tackle problems...
Forum: OLED Technology and Flat Panels General   11-07-2015, 11:40 PM
Replies: 13,157
Views: 1,240,304
Posted By xrox
Of course you can. Take an extended source, cover...

Of course you can. Take an extended source, cover 90% of it up, then move far enough away until it is observed as a point source and see how it looks. I'm a little confused at this statement.

I...
Forum: OLED Technology and Flat Panels General   11-07-2015, 11:17 PM
Replies: 13,157
Views: 1,240,304
Posted By xrox
This is a great study as well. If you watch a...

This is a great study as well. If you watch a single white pixel on a black screen and move further away the pixel will absolutely start to look dimmer (less bright) as it is acting like a point...
Forum: OLED Technology and Flat Panels General   11-07-2015, 10:45 PM
Replies: 13,157
Views: 1,240,304
Posted By xrox
A true point source does not exist. Like I said,...

A true point source does not exist. Like I said, at a certain distance or area, your eye begins to treat an extended source as a point source. Luminance becomes intensity as only one angle exists....
Forum: OLED Technology and Flat Panels General   11-07-2015, 12:55 PM
Replies: 13,157
Views: 1,240,304
Posted By xrox
No you can't treat them as extended sources...

No you can't treat them as extended sources unless you are close enough that the subpixel area is resolvable to your eye.

Extended source = If you block 90% of the area the luminance and...
Forum: OLED Technology and Flat Panels General   11-07-2015, 10:52 AM
Replies: 13,157
Views: 1,240,304
Posted By xrox
The eye sees luminance. It is not concerned with...

The eye sees luminance. It is not concerned with luminous flux.

I think everyone here is not understanding the role the eye plays. I tried explaining it in my last post.

When the light source...
Forum: OLED Technology and Flat Panels General   11-06-2015, 10:23 PM
Replies: 13,157
Views: 1,240,304
Posted By xrox
The way I think of it is that the human eye has...

The way I think of it is that the human eye has millions of detectors all fed by a single set of optics.

The display can be thought of as a compilation of millions of point sources that we...
Forum: OLED Technology and Flat Panels General   11-06-2015, 01:40 PM
Replies: 13,157
Views: 1,240,304
Posted By xrox
The discussion about larger blue subpixels and...

The discussion about larger blue subpixels and perception is a really good study on photometry IMO. My good friend is a photometry/OLED professor and researcher and I will love to ask him this when...
Forum: OLED Technology and Flat Panels General   10-14-2015, 09:10 PM
Replies: 97
Views: 6,372
Posted By xrox
A little off topic but this example is a great...

A little off topic but this example is a great study in photometry IMO. I had to relearn this stuff after a similar concept came up in the OLED ABL thread.

The human eye is a luminance meter (ie -...
Forum: OLED Technology and Flat Panels General   10-01-2015, 08:09 PM
Replies: 37
Views: 3,639
Posted By xrox
But if the "other" examples are also not...

But if the "other" examples are also not realistic then you really haven't demonstrated anything?

Peak brightness? At what APL? As the plot suggests for power on demand displays the peak...
Forum: OLED Technology and Flat Panels General   09-29-2015, 09:42 PM
Replies: 37
Views: 3,639
Posted By xrox
IMO you are not understanding the plots regarding...

IMO you are not understanding the plots regarding eye fatigue and average brightness. It is not necessarily the magnitude that is the issue. It is overexposure due to iris being open from low apl to...
Forum: OLED Technology and Flat Panels General   09-29-2015, 06:08 PM
Replies: 37
Views: 3,639
Posted By xrox
Old but familiar topic. Power, luminance...

Old but familiar topic. Power, luminance efficiency, and lifetime really govern the ABL strength.

As for other benefits, the ABL enables higher contrast in power on demand devices and reduces eye...
Forum: OLED Technology and Flat Panels General   01-31-2015, 09:36 PM
Replies: 123
Views: 3,581
Posted By xrox
Based solely from single or anecdotal experiences...

Based solely from single or anecdotal experiences of myself and friends the Lg reputation is poor as a brand. Our Lg fridge literally caught fire (thankfully we were home). They had no service...
Forum: OLED Technology and Flat Panels General   01-24-2015, 10:07 AM
Replies: 13,157
Views: 1,240,304
Posted By xrox
It is complex but fascinating. PDP cells...

It is complex but fascinating.

PDP cells have a combination of electrodes and dielectric material that enable control of on/off state by controlling wall charge above and below the discharge...
Forum: OLED Technology and Flat Panels General   01-23-2015, 06:57 PM
Replies: 13,157
Views: 1,240,304
Posted By xrox
Not trying to confuse the issue here but OLED and...

Not trying to confuse the issue here but OLED and LCD are similar in that they both use a TFT to control light output. PDP does not have any TFTs and relies on wall charge to control the on/off...
Forum: OLED Technology and Flat Panels General   01-09-2015, 10:30 PM
Replies: 13,157
Views: 1,240,304
Posted By xrox
Changing the shape of the strobe intensity isn't...

Changing the shape of the strobe intensity isn't going to accomplish much. The benefit is coming from increasing the effective duty cycle. Anyways, this gradual strobe shape is inherent to PDP and...
Forum: OLED Technology and Flat Panels General   01-06-2015, 11:27 AM
Replies: 13,157
Views: 1,240,304
Posted By xrox
It is absolutely possible. In fact it is...

It is absolutely possible. In fact it is inherent.

Plasma displays have at least three distinct mechanisms that caused retention of an image including wall charge imbalace, MgO sputtering, and...
Forum: Plasma Flat Panel Displays   01-01-2015, 11:03 AM
Replies: 147
Views: 71,156
Posted By xrox
DFC is only present when your eyes track motion...

DFC is only present when your eyes track motion on a PDP. If you see this artifact on still or paused images then it is not DFC and probably just banding/posterization.

Posterization can be...
Forum: OLED Technology and Flat Panels General   12-31-2014, 11:58 PM
Replies: 49
Views: 1,794
Posted By xrox
I would think that lifetime numbers read in OLED...

I would think that lifetime numbers read in OLED papers are quite specific to the material in a ITO glass slide configuration.

Note that the quoted lifetime numbers of a full production flat panel...
Forum: OLED Technology and Flat Panels General   12-31-2014, 11:40 PM
Replies: 18
Views: 891
Posted By xrox
IIRC (a big if since it has been years) the blue...

IIRC (a big if since it has been years) the blue PDP phosphors were 1000 times faster than the red/green. So a 0.3ms phosphor would still be 100 times slower than blue?
Forum: OLED Technology and Flat Panels General   12-31-2014, 11:37 PM
Replies: 18
Views: 891
Posted By xrox
Thanks for this. Quite interesting as there is...

Thanks for this. Quite interesting as there is only mention of 14 subfields in all Pioneer patents AFAIK. The fact that it is exactly double has me wondering if a misinterpretation is occurring on...
Forum: Plasma Flat Panel Displays   12-31-2014, 11:01 PM
Replies: 147
Views: 71,156
Posted By xrox
Aside from Pioneers driving method that...

Aside from Pioneers driving method that eliminates the possibility of DFC, the same artifact can also be reduced by altering the subfields weights to compensate for the viewers eye movement during...
Forum: Plasma Flat Panel Displays   12-31-2014, 10:45 AM
Replies: 147
Views: 71,156
Posted By xrox
DFC on plasmas is a motion artifact. Nothing to...

DFC on plasmas is a motion artifact. Nothing to do with too few subfields. Pioneer uses contiguous subfields in its CLEAR driving method and this method is free of DFC.

What you are describing is...
Showing results 1 to 25 of 1000

 
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