Are screensavers needed with today's monitors?

Thanks for your reply Jim!

I'm sure it varies, but would there be a usual minimum time required, such as 10 hours without a screensaver, and not changing the screen to another program or leaving it static, or is a matter of a few hours perhaps? Maybe days?

I suppose there would be a way to check out a monitor for this, a blank white screen, and look for what, ghost images that won't go away I suppose...?

Hey Jim, What do you think of that new hyundai image quest Q910 for 218? It looks cool. If you had 225 bucks what monitor would you buy?

Thanks for the reply.

And just wondering, under windows 98 in powermanagement, what do you suggest as a setting for Turning Off Monitor in minutes?

I heard that if u turn it off too often you can destroy the electronic components inside, but if you never turn off monitor, you wear out the tube.

As an expert in monitors, what do you suggest as a good setting?

I turn mine off every 25 mins using the power management.

Ok thanks. One last question, is there ANY chance at all that an inexperienced end user like me can fix a miscovergence of electron guns (on Trinitron), or fuzziness at corners, without special equipment? Im pretty good with electronics but have never tried openning up a monitor before. Yes, I do know about the shock hazards

Im very curious about this, and I had to ask you since you are an engineer.

Thanks for all the tips.

Does the rgb color temp. settings affect the life of the monitor?

<i><font color=blue>The only difference between 200 fps and 300 fps is the blink of the eyes.</font color=blue></i>

Really?! Isn't increasing the color temp really just increasing the brightness of color(s) and doesn't increasing brightness decrease phosphor life? I've noticed that increasing rgb together at the same rate definitetly produced brighter images. Could you expound the not so simple answer to color temperature increasing? Thanks.

Quality is better than name brand, even regarding beloved AMD.

I already know that 9300K, 6500K, and 5000K are some of the most common temperature standards. There are two things going on when you talk about the overall temperature. First is the relative ratios of red, green, and blue (this causes tints and is what you mean by "mixing" ). This mixing creates tints as you emphasize or de-emphasize either r, g, or b. Secondly, the higher the overall temperature value, the higher absolute temperature per color. My question deals with the second notion of temperature.

I didn't ask about the brightness and contrast defs also, as I already read that somewhere.

You still haven't answered my question. Keeping the rates of each color rise constant (take the ratios out), what is the effect of increasing temeperature? Obviously, the color becomes "brighter" and if raised collectively results in bright colors of the same tint (since the ratio hasn't changed), but what causes this?? I think the overall strength of emitted light (sorry I don't know the technical term but I think it's brightness or luminescense), per color, is increased as you increase the temperature. Is this wrong? Please explain technically what, for just one color such as red, happens when you increase the temperature. As I said, I suspect you are increasing the intensity of that component color, which is tantamount to increasing brightness. Now, if you mess with the ratios, you'll have different tints. But if you raise all at the same time everything becomes brighter at the same rate and a brighter image is achieved similar to just raising overall "brightness" (not the technical definition, just as in higher light output).

Please ask me questions if my question isn't clear.

Thank ya.

Quality is better than name brand, even regarding beloved AMD.

Here is a writeup I did on color temp, this may help explain.

The Correlated Color Temperature of a light source is usually referred to in the specs as CCT, and in common speech as “color temperature.” This rating indicates the color of a tube or bulb when it’s lit. It also indicates the general atmosphere (warm or cool) created by a particular bulb or tube.

Color Temperature is measured on the Kelvin scale. Zero degrees Kelvin is equal to minus 273 degrees Centigrade. Without getting into the more boring details, the CCT basically refers to what temperature in degrees Kelvin an iron bar would have to be heated in order to duplicate the color of a particular bulb or computer monitor tube.

Strangely, a higher color temp indicates a “cooler” color. This of course is due to the fact that you heat iron first to red-hot (around 1500 to 2000 K) and later to white-hot (3000 to 5000 K) and finally to a bluish-hot (6500K and above).

Incandescent bulbs have color temps between 2000K and 3000K. The most common incandescent color temp is 2700K. Halogens have a CCT of 3000K. That’s why Halogens look a little “whiter” than standard incandescent. Fluorescent bulbs can be manufactured with almost any CCT - depending on which phosphors are used, and their relative proportions.

The color of the light used to view an image is probably the most important factor affecting its appearance. If you have ever compared a paint chip in a hardware store to the actual paint in the can versus the same paint on the wall, you know they all look different. One of the biggest factors affecting these variations is different light sources. Typical store light is a cool florescent, while home light is a warm incandescent and daylight streaming through open window changes according to the time of day.

Color temperature is a way to define the illumination of a light source. The color temperature or chromaticity of a computer monitor is usually described in terms of its color temperature or, more accurately, by its "X" and "Y" coordinates on the CIE Chromaticity Diagram. We can measure a computer monitor “X” and “Y” color coordinates vary accurately with a color meter

Color adjustments give the user the flexibility to customize color settings for different types of applications. Text based applications text based applications that use light backgrounds with black text benefit from cooler bluish white “paper like” colors. Color / graphics applications like web page development and pre press benefit from warmer reddish color adjustments. Optimizing the monitors color settings will provide for more accurate color reproduction and accuracy.

So bottom line is, color temp has does not have a real affect or degrade the phosphors, it is the beam current applied by the contrast and brightness controls that will have a larger affect.

Jim Witkowski
Chief Hardware Engineer
Monitorsdirect.com


<A HREF="http://www.monitorsdirect.com" target="_new">MonitorsDirect.com</A>

Thanks for the details on what color temp means, how they are used, and how they apply to light bulbs. But you still haven't answered my question.

Ligth bulbs are more akin to the just the cathode of monitor. They are designed with certain materials that give off certain wavelenghts of light at certain current. Generally speaking (depending on the material), increasing the thermal temperature of a material will increase energy and shift the wavelenghts towards the ultraviolet area (shorter wavelengths). Now, if you use a dimmer switch, you are basically controlling the current that runs through the bulb. By decreasing it, you effectively lower the current (less resistance to the filament, less heat), which not only lowers the brightness but causes it's color spectrum to emit more red relative to other visible colors. This simple analogy makes me consider that this also happens in the cathode of the monitor.

Now, in computer monitors, color isn't strictly defined by wavelength emitted by the cathode. The phosphor triads emisson, which is affected by the cathode of each component color, determine the color on the screen. What I'm asking is what physically happens when you increase or decrease the temperature of, say red? Does the red cathode increase in brightness (as if dimmer switch is increased), or something else? Also, what is the relationship between the phosphors and cathode beam? Can each phosphors emit slightly different hues (wavelenghts)depending on the energy level of the electrom beam, or does it increase or decrease the intensity of the same hue? Also, is the phosphor sensitive to different wavelengths from the cathode, that is, does it change it's emission(intensity and/or hue) based on the excitation wavelenght (intensity and/or hue)?


Thanks


Quality is better than name brand, even regarding beloved AMD.

Sorry, it doesn't answer my question. You are not reading carefully.

Color temperature is controlled by three hue controls (some monitor just have a single temperature control, while others have individual hue controls that make up what is known as temperature). Adjusting the ratio will give different tints, but what if you kept the ratio constant and just increased or decreased all colors at the same rate? What is happening when the ratio is controlled for? I've noticed that tint looks the same, when ratios are constant, but the whole image looked brighter or darker depending if you increased or decreased the hues at a constant ratio.

I was hoping you could answer my question as you are expert, though your aversions suggest otherwise.

This statement is ambiguous.

"At this temp, with the contrast set at max, the monitor luminance output is max"

Are talking about the contrast, temperature, or both as contributing to max luminance? If it is either the temp. or both, then you are saying that color temperature does indeed at least contribute to increase of the luminance, and therefore will technically increase screen wear, much as just turning up the contrast (white) will. What if the color temp is low (for each of the hues)and contrast is set to high? Will the monitor luminance output be less or more that scenario you described? If less, then, assuming by luminance you mean the increased emission of light by the phosphors, you have to admit that increasing temperature, to what significant degree unknown to me, will affect negatively affect the phosphor life relative to decreased temperature (assuming all else equal).

The statement below is not true strictly true if I understand it correctly.

"When you change color temp and want a more reddish color, the monitor simply decreases the beam current that hits the blue and green phosphors"

5000K is reddish, but the red hue in absolute value lower than in 9300K, though in proportion to blue and green is higher to 9300K! I have a feeling you are not so familiar with the component nature of temperature color, or else you are deliberately misleading.

Now, it could be that each component color control doesn't affect one color, but that it controls a ratio itself, namely subtracting other hues to relativley raise its own hue. So increasing the red hue, is in fact lowering the green and blue. Let's say it's by -1 each per hue. If this is true, then increasing blue and green by the same amount will actually result in r of -2, g of -2, and b of -2. The ratio will be the same after increasing the hue by the same amount for all component hues, but since it is subtractive for "adversary" hues, the overall luminance has gone down! Isn't white light based on combinations of r, g, and b and doesn't increasing the luminance of the hues at the same rate increase in a brighter white (of the same ratio)? By your explanation above, the highest temperature will will result in the lowest luminance.

Maybe you could just answer this one repeated question.

When adjusting the hue (of which three make up "temperature" ), what physical parts of the monitor of the involved (please, talk about cathodes, phosphors, or whatever is relevant) and how do they change?

Again, I value your expert knowledge for my selfish curiosity.

Quality is better than name brand, even regarding beloved AMD.

I'm asking for a really technical (physics, mechanics, etc.)answer in all it's glory as I really want to what to know actually happens.

What physically happens when you change the red hue up or down? Is that too much to expect from a monitor expert to answer? You still haven't answered this simple question!

Please answer or tell me you don't want to.

I've read your posts. They only circumscribe the concept of temperature without really going into the details.

Also, you don't seem to distinguish between hues and color temp which makes me hard to understand what you are talking about. Please answer in terms on just one hue control, for clarity's sake.

Please explain or not.

Thanks.

Quality is better than name brand, even regarding beloved AMD.

You still didn't seem to understand my question, but I can pick apart some facts from you said. I already understand that how color is dependent on three phosphors elements and electron guns.

What you fail to understand is some monitors can go above 9300K and that some monitors include individual hue adjustement rather than preset color temps. From 9300K I can leave blue and green the same and just lower the red.

At default, most monitors are at 9300K which is the highest value, therefore you can only turn it down. So you are saying that though color does affect phosphor life, since it is practically a moot point since monitors are already set at the highest point. This is different from saying "color temp does not affect phosphor life at all". I can increase my monitor life at lower temp, as you say. You had previously said that color temp has no effect on phosphor and cathode life.

Even though you havent fully answered my question, you have finally said the color temps do have an effect on phosphor life.

Thanks.

Quality is better than name brand, even regarding beloved AMD.

Higher than 9300K does not turn the image blue if you also increase the other colors at the same time. I've done this on my own monitor.

I'm a bit picky and care more about conceptual truth than practical utility, so little significance is still something if only to understand it. Given all else equal, higher color temp will decrease, though to perhaps a very small degree, phosphor life.

I don't care either way, but justed wanted details.

Thanks!

Quality is better than name brand, even regarding beloved AMD.