What is Screen: Definition and 211 Discussions

CONFIG.SYS is the primary configuration file for the DOS and OS/2 operating systems. It is a special ASCII text file that contains user-accessible setup or configuration directives evaluated by the operating system's DOS BIOS (typically residing in IBMBIO.COM or IO.SYS) during boot. CONFIG.SYS was introduced with DOS 2.0.

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  1. Tazerfish

    Strange Optical Phenomenon (diffraction or something else?)

    First of all i will post a picture of it ... you can find it ... somewhere sorry this is my first post :I I photographed our television with the flash on in order to recreate a strange patter i saw when looking at the suns reflection in the screen.(with my eyes it's not just the camera) You can...
  2. Y

    Black screen in Win 10 after sleep

    I just up graded my older Lenovo Ultrabook U310 from Win8.1 to Win10. It worked a lot better, no more instability like before. My only problem for now is black screen after putting it to sleep. I set it so it goes to sleep when I close the lid. I do that every night, but in the morning, 70% of...
  3. Siddharth Venu

    Convex Lens Problem: Find Focal Length

    A screen is placed 90cm from a object. The image of the object on the screen is formed by a convex lens at two different locations separated by 30cm. The focal length of the lens is what?
  4. H

    How are flat screen monitors made?

    I understand the bit about liquid crystals and polarization of light. The question is how the screen is made. Is it full of a a matrix of tiny wires? How is it made so precisely?
  5. A

    Help designing a music visualizer for a 12x12 LED screen

    I am working in a group for designing a LED interactive Screen. My part of the project is the design of the music visualization system. I am new in this area, but I know I need to use some op-amps to filter the input signal from the mp3 player. Could anyone give me any suggestions on how to...
  6. S

    Is it possible to have a input & output screen or speaker?

    K so you have your computer screen, and speakers, but can they record too (input)!? My speaker vibrates by electricity to make sound, so why can't my voice make (these speakers) vibrate and send electrical signals back? A wire shoots out photons in x amount of brightness through a color-filter...
  7. genxium

    Is there any screen of cellphone equipped with DLC coating?

    It's kind of strange to me that when reading topics like "components of cellphone screen", people often mention an outermost anti-reflecting coating which takes advantage of destructive interference. There're few mentions for using DLC-coating as a cellphone screen outermost coating but...
  8. moenste

    Find the position of the lens between two holes and screen

    Homework Statement An opaque card is pierced by two small holes 4 mm apart and strongly illuminated from one side. A lens on the other side of the card focuses images of the holes, 16 mm apart, on a screen 125 cm from the card. Find: (a) the position of the lens, (bc) the focal length. Why are...
  9. D

    Why Is There a Black Line Moving Across the Screen?

    from a bit of googling, i realize it's because the frame rate of the camera and the projector are different. however, i have tried recording videos with cameras of 60fps, 30fps and 15fps, and the projector is likely 60 fps. That's why I'm curious about this - which frame rate is faster (the...
  10. P

    How to Calculate Light Emitted from an LED Screen: A Guide

    Hi, I have a question how to calculate the light emitted from a LED screen. The LED display is rated at 5000 nits. Total size of the display is 64sqm. (8m x 8m touching the floor) I would like to calculate the total light emitted, the light on the floor in front 1m away and the light on the...
  11. C

    What is the initial velocity of the ball just as it enters the screen?

    Homework Statement What is the initial velocity of the ball just as it enters the screen? The Job Using your understanding of projectile motion along with some background research on video analysis, devise a way to find the initial velocity of the tennis ball in the video just as it enters...
  12. Jilang

    Two slit experiment with a wavy screen

    I was wondering if the two slit experiment has been performed with a wavy screen, the screen being modulated in such a way as to compensate for the difference in the phases of the paths from the two slits. If so what was the result in terms of the angular distribution? If not what would it be...
  13. gfd43tg

    Fixing a Torn Screen After a Fire Alarm

    Hello We just had the fire alarm go off at a building in school, so I briskly put my laptop to sleep and stood outside. It's about 85 F outside, and my computer has had some issues with getting hot. Now I took it out of sleep and the screen is torn. I tried turning off the computer and reboot...
  14. S

    How can I write code for an optical touchscreen using infrared technology?

    Hello, I am looking into building a touch screen. I have been considering a capacitive touch screen but I am also interested in optical touchscreen using infrared like the ones one this link...
  15. StevieTNZ

    Easier Way to Print Screen - Samsung Tablet

    Hi there I often have trouble taking print screens on my Samsung Galaxy Tab S. The instructions say to hold down the home and power button key at the same time, but I do that and no flash occurs (to indicate it has taken the print screen). At times I get a 'Complete Action With' box, other...
  16. M

    Language C - Position my Printf in X and Y on the screen.

    Homework Statement I work on Microsoft Visual studio 2010 on Win7. Ok so let me explain the problem here, The functions works very good to position my printf in X and Y on my screen ONLY when my 2D Array labyrinth Map is NOT printed on the screen. But once I printf my Map on the screen I...
  17. I_am_learning

    Improving your English pronunciation using screen readers

    English isn't my first language (and not of my friend's too :) ), but I have been reading and writing English text for a long time now. This has greatly improved my vocabulary and comprehension, but I recently realized that it wasn't doing any help to my pronunciation skills. Not having heard...
  18. Symmetry777

    What is a Magnetic Screen or Magnetic Shield?

    What is a Magnetic Screen or Magnetic Shield? Soft Iron Magnetic Shield?
  19. I

    Main motor and Denester not starting when pressing start button on screen

    Hello everyone, Please let me know when we press start button on screen for Motor and Den-ester in auto and manual mode why it is not starting?, which points i have to check for input and output signals from drive. And there is no error on screen. Please refer both electrical drawings. Thanks.
  20. J

    Calculating Magnification with lens, an object, and a screen.

    Homework Statement A lens with focal length fo = 9 cm forms an image of an object placed a distance d=3.7fo to the left of the lens, onto a screen to the right of the lens. The distance L from object to image is fixed. The lens is now moved toward the screen a distance x until an image is...
  21. Medicol

    Why is my Screen Text Still Emboldened Despite Adjusting ClearType Text?

    Please take a look at my screenshot attachment, I have tried several times to Adjust ClearType Text in Control Panel but nothing seems to change at all. Some letters are still always emboldened. I am using Windows 8.1. Intel (R) HD Graphics card (current plug-in) NVIDIA Geforce GT 620 (not in...
  22. F

    Resolution (visual acuity) and screen discreteness

    Hello Forum, Resolution is an angular distance (measured in fractions of an 1 degree angle). The lower the resolution the better. It represents the ability to distinguish two objects that are very closer to each other. For an optical system, the resolution increases when the diameter D of...
  23. S

    The cursor of my laptop screen is oversensitive? How to stop it

    Hello everyone, Recently the cursor of my laptop screen is so overactive and oversensitive. If I just click one thing, it clicks many things. If my cursor just moves near some folder or something, it quickly opens even when I didn't click it. How can I get my cursor to normal sensitivity...
  24. B

    What causes the distinct color pattern when water hits a screen?

    When water hits the screen. You can see that a specific pattern. A special kind of pattern color pattern can be seen in the drops.. I am able to see that the colors green, red and blue come forward very distinctly. Is there an easy explanation for this?
  25. N

    Moving an object and screen to find the focal length of a lens

    Homework Statement A convex lens is used to project the image of an object on a screen with a magnification m1 . Leaving the lens fixed, the object is moved along the optical axis by a distance Δs and the screen is moved until the image is located again. If the new value of the...
  26. S

    Why do our eyes need to be far from the lens to view a real image?

    I do understand that we don't need a screen to view a real image, but why our eyes need to be far away from the lens than the image? Why can't we be exactly where the image would normally appear if we had a screen? Moreover, the image there is sharp because the rays converge exactly at that...
  27. junfan02

    What happens if the screen in young's double slit experiment is replac

    What happens if the screen in young's double slit experiment is replaced with a photoelectric material? Electrons should be emitted only from regions where constructive interference occurs! Doesn't that mean in this case light will depic both wave and particle nature? That is clearly not...
  28. mrspeedybob

    How do bar code scanners read a bar code from a cell phone screen?

    A quick google search found that there are 2 kinds of bar code scanners. One uses ambient light and a CCD device, these obviously would have no problem with a bar code on a screen since it is essentially just taking a picture. The other kind sweeps a laser over the bar code and reads the...
  29. V

    Expression of an object and its image onto a screen with two lens?

    Homework Statement Formulate an expression that gives the focal length of a corrective lens, to be used in conjunction with a fixed lens. You may assume that both lenses are on the same plane, i.e. that they are very close together. The corrective lens should allow an object at a specified...
  30. B

    What might be the reason for flickering phone screen?

    Phone got wet. The screen is flickering and dim but now it started to show just green with some lines across. Cam isn't working but everything else seems to be fine. Where's the problem, motherboard or screen itself?
  31. C

    What is the operating frequency of the touch screen for the iPhone?

    I am trying to find the operating frequency for the iPhone 3, 4 & 5 touchscreen controller. Once I find these frequencies I would like to add filtering to my prototype so that these frequency do not interfere with the functionality of the capacitive LCD touch screen.
  32. M

    Double-slit quantum eraser: measured patterns on screen

    Consider a double-slit quantum eraser experiment such as the one by Walborn et al (http://arxiv.org/abs/quant-ph/0106078). The overall pattern formed by the signal photons on the screen behind the double slits is the same regardless of whether which-path information is available or destroyed...
  33. Crazymechanic

    Creating an Atomic Screen: A Solution to Separating Nuclei in Physics

    Hi , well this is just a idea that came up when thinking about a certain problem in physics. Now it's late and I don't wan to be long but is it possible or has it been done , a device that could for example hold back lighter nuclei and let through heavier ones or vice versa? Well imagine a...
  34. B

    A modified double slit screen scenario- what would happen?

    This scenario is identical to the classic double slit screen experiment except that the photon is at extremely high energy. The energy is so high that the photon's momentum maybe registered by a mechanical measuring device(i.e spring or accelerometer attached to a receiver). At the moment of...
  35. G

    Possible for a screen to be both brighter and darker than another?

    I'm looking into different surfaces for use as a projector screen. One of the most highly-regarded screen surfaces is the Stewart StudioTek 100 (http://www.stewartfilmscreen.com/residential/materials/front_projection_screen_materials/studiotek_100/studiotek_100_residential.html ). In a...
  36. N

    TV Screen & Bracket Moment Question

    Hi all, Can anyone help me with (what I think is) an equation relating to moment. I want to know what the point load will be on a wall with a TV screen and articulated bracket. The screen weighs 25kg The bracket weighs 20kg The bracket puts the screen out at 700mm when fully extended...
  37. CivilSigma

    How many electrons would transfer 1 J of energy to a screen?

    My answer to a) is 1.14 * 10^-19 J, which is correct. My answer to b) is 1.14 * 10^19, which is not correct. The correct answer is 8.8 * 10^18. How did they get that? because if 1 electron has 1.14 * 10^-19 J then won't we need 1.14 * 10^19 electrons for 1 J ?
  38. S

    Effect of photon detection mid-way between (double) slit and screen

    In a single particle double slit (self-interference) experiment: the which-way information is got by having the detection instrument (or at-least part of the instrumentation) right next to the slits.To make it easier, Let's assume the following x-coordinates: at source of photon x = 0 slits...
  39. R

    Find Distance from Screen to Slits in Double Slit Experiment

    Homework Statement See attached image Homework Equations y=L*tan(theta) m*(lambda)=d*sin(theta) The Attempt at a Solution Lambda = 640 nm = 6.4x10^-4 mm m*(lambda)=d*sin(theta) 1*(6.4x10^-4 mm) = (0.25 mm)*sin(theta) theta = 0.15 degrees y = L*tan(theta) This is...
  40. T

    How do I transform value into screen coordinates

    How do I transform my x, y values into screen coordinates system All values is in pixels In my coordinate system origo is located in (40,495) The display area that I can use is from X=40 to x=750 and from y=495 to y=55 When you go down in the coordinate system the y value is increasing...
  41. Saxby

    Lens Object Screen Problem: Finding the Focal Length and Image Distance

    Homework Statement An object is placed 2.4m from a screen, and a lens of focal length f is placed between the object and the screen so that a real image of the object is formed on the screen. When the lens is moved 1.2m toward the screen, another real image of the object is formed on the...
  42. J

    Why don't handheld devices have screen calibration settings?

    I mean i love having the screen set to perfect calibration like the iphone, but why don't we have tvs like that? It would be nice to not have to set anything on a tv and have a perfect picture quality. Do you think that will ever happen? Vice versa, do you think handheld devices will have screen...
  43. M

    Cylindrical pipe holding up a screen (real world project)

    This is a real world project. I'm building a giant roll-up window shade to be used for a special effects green screen. The first real model attempt (without math) failed. See the two pictures of the tube structure being held up by chairs. The only axle was about 3ft of 1.5" pipe at each...
  44. T

    All screen pictures variations

    I don't know if there was talking about this or somebody already did this but do you think it would be possible to make software that shows you all possible pictures variations on your monitor/TV? What I mean is monitor works on RGB principles and is separated into tiny squares that gives RGB...
  45. N

    Somebody help My PC screen is Zoomed.

    I am using Dell Inspiron PC and Windows 8 Pro. Today My PC Screen is Zoomed out, everything looks extra large. how can I back to Normal View. Please help.
  46. H

    Do we need a screen to view a real image?

    So, the question I ask is simple : " Is a screen necessary to view a real image?" For example, when I view my image at the 'concave mirror' side of a spoon, a real image is visible. Now, according to my book the image location should be between Centre and Focus. So, is the image actually...
  47. C

    I want to move an object on the screen a fixed distance in a fixed tim

    Hi everyone. I am a programmer and I think some basic physics will help me to achieve something I wanted to do. I want to move an object on the screen a fixed distance in a fixed time, but rather than moving with a uniformed velocity I want it to slow down at a constant rate so that it...
  48. Saladsamurai

    Purchased a Flat Screen TV: Picture Not That Great

    Hi folks :smile: I am thinking that there are plenty of people here that have these and was hoping for some input. I bought a 46" Insignia (Best Buy's own brand), 60 HZ, 1080p, LCD television. I got it on sale at Best Buy for $399 and it had fairly decent reviews (average of 4.3 stars out...
  49. G

    How to optimise stiffness for a projector screen?

    I am thinking about building a projector screen out of MDF. Here Down Under the available sizes are: http://www.misterplywood.com.au/products/mdf. Building such a screen will be easier than the normal frame with stretched fabric type, but I am concerned about its long-term flatness. So I thought...
  50. B

    How are multiple video outputs displayed on various sections of the TV screen?

    CRT televisions use electron guns to fire electrons at color phosphors on the screen which emit the light of varying frequencies to produce an image. They can scan row by row or column by column depending on the standard of the broadcasting signal though modern models have circuitry that can...
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