Screen Definition and 212 Threads

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...

I have a problem that I'm having trouble cracking and was wondering if anybody has any ideas on it. An impact test that we have to do involves swinging a pendulum of weight 50lbs into a rolling easel (for writing on, approximately 6ft high, with casters). The wheels are blocked so the easel...

Homework Statement In a high school project we have been given the assignment to design the mechanism to transform the a rotary motion into the oscillating of a wiper blade. I'm a bit confused as to how to go about the problem.. I have been given that there is a closing force between the...

Hi, I need to build an oscilating screen of about a4 size. The screen needs to be made from 1mm thick acrylic and be flat. It needs to oscilate up and down a total distance of 4cm (2cm up then 2 cm down) and do this a total of 30 times per sec , so 15 ups and 15 downs. I'd like the motion...

I've never had this issue before. My code will create the file and also output anything to terminal. But if I change the output from terminal to file, it does nothing. For example, this line write(*,*) "ist1, ist2 =",ist1,ist2 outputs my two indices in every loop iteration. But...

Homework Statement Why is the length of time over which a phosphor emits light an imporant factor to consider when designing a television screen? Homework Equations The Attempt at a Solution I have gone over the last three chapters in my textbook for the answer. I even drove to...

Homework Statement A Fraunhofer diffraction pattern is produced on a screen 218 cm from a single slit. The distance from the center of the central maximum to the first-order maximum is 7620 times the wavelength (lambda). Calculate the slit width. Answer in __m Homework Equations...

Homework Statement why do we need a viewing screen in order to see interference patterns? why can we see interference patterns through our fingers when we look at a distant light source and we don't need a screen in that case? what do we mean by visible light? can we see the wave itself...

Homework Statement In Fig. 22-56 an electron is shot at an initial speed of v0 = 4.14 × 106 m/s, at angle θ0 = 43.6 ˚ from an x axis. It moves through a uniform electric field = (5.34 N/C). A screen for detecting electrons is positioned parallel to the y axis, at distance x = 1.64 m. What...

Here's a couple of programs that I really couldn't figure out some of their lines: This function checks if the 1602 is busy, I suppose it means whether data are being passed to the registers of 1602: bit LCD_Check_Busy(void) { DataPort= 0xFF; // Dataport is P0. What does this do? Is...

How is it possible that when one watches a color television screen, one perceives the three base colors of the pixels as if it were a mix tone of these base frequencies, proportional to the relative intensity of the different pixels? It puzzles me! Hope someone knows how this is possible.

So I have a project that I'm contemplating undertaking. What I basically want is: A lot of the times I'm lying down on my bed and watching a show or something. Except I would rather my face be facing the ceiling than one of the walls, if that makes sense. So I'm trying to make a small device...

Recently i installed windows 7 enterprise in my lenovo. Problem is that system became very slow.. Even for refresh, its taking 5-6 seconds. Sometimes pages are not responding, while i open multiple pages in my browser. From the last 5 days .. sometime, system is becoming blank, says intel...

If the blue screen on your TV is only 1/3 blue, 2/3 black, why do we see it as blue? (Each pixel on a Cathode Ray Tube TV is made up of 3 phosphor dots, red green and blue, so when you have a blue screen, only the blue dot is lit up).

What causes this effect? What am I seeing?

Today, a coworker got me. I had left my screen unlocked. He took a screenshot of my desktop, set it as my desktop, and then turned off my icons. Took me a few minutes before I realized what had happened. I need payback ideas.

I hope this topic belongs here, after all this is about color and color is described through quantum mechanics. How come when water molecules drop on my computer screen I see a variety of colors (kind of like a rainbow), and those colors change depending on the angle I am observing it...

how to take print screen during windows installion?

I'm trying to create(or buy) a transparent touch screen. I realize this is a difficult task, through all of my research. I have found http://solutions.3m.com/wps/portal/3M/en_US/TouchSystems/TouchScreen/Solutions/TouchScreens/MicroTouchSCT3250EX/" to be the best transparent touch pad. Now I...

When the screen on a laptop breaks, it can be a very intimidating problem indeed for those who have never taken a laptop apart in the past before, In this Instructable i hope to dispel a part of that mystery in an effort to empower you so you can repair your own laptop next time it breaks...

Where I live, temperatures fluctuate like crazy (I technically live in a desert climate) . We can have 80F degree days and have it drop to 40F degrees that night. My house, for whatever reason, will have the upstairs heat up to the 80 degrees, yet when it gets cooler, it will take a long long...

Homework Statement A man holds a light that emits light of wavelength λ. The light beam passes though a pair of slits separated by a distance d, in a screen plate attached to the front of the light beam(double slits experiment). The beam then falls perpendicularly on a screen, getting an...

My mouse cursor frozen on screen and I already tried ... My mouse cursor has frozen on screen and I already tried the Fn-F9 and rebooting it and it didn't unfreeze it. Built in mouse is still unresposive. What else can I do? Any other comand on the laptop that could get the mouse going again?

Hello all, I have a question more or less for everyone's entertainment. Organic Light Emitting Diodes (OLEDs) can be used to make flexible screens or other devices of similar function. However, one of the major obstacles to having a practical OLED devices is the lifespan of the product. OLED...

Hello there, A friend of mine is developing an iphone app. that will have the ability of scanning a barcode(not using the camera to scan a barcode-like redlaser) that is displayed on your iphone using a barcode scanner at store points of sale(Cashiers).He is having trouble with the barcode...

Hello, Is there such a thing as a projection screen that is transparent to IR? I need to project an image onto a screen (rear-projection), but I also need to send an IR signal through the screen from the side of the human user back to the side with the projector. I think there are...

In the olden days (1960s 70s and 80s, at least) they used to use a blue background for doing picture inlay of an actor into a remote background scene by switching between scenes as the scan moved over the picture. It was pretty crude at first but they eventually got the soft edges to look...

Hello, I'm working on a robotics project with one of my friends for an (relatively small) competition at my school. Anyways part of our project involves interfacing an LCD screen to an FPGA however we're having a problem with that particular aspect of the design. The clock signal on our...

One day the display on my Sandisk Sansa mp3 player just stopped working. There's no way to fix this, is there? :(

hello ppl... As a project for my acads I've decided to do it on Interface free Touch Screens... facilitated by its multi touch feature...which would use a Capacitive or SAW type of screen... ..looking forward to receiving your suggestions, ideas .

I have a short code that calculates the running median for three columns of data in an input file and writes the running medians out to three columns of data in an output file. I use Numerical Recipe subroutines and functions to compute the running median. If I include a WRITE(*,*) directly...

Hey I'm wondering if anyone has ever heard or knows of a touch screen program that would maybe use something similar to the Mathematica engine. I have seen some handheld touch screen computers for very cheap. It would be really useful(and just plain awesome) to be able to create equations and...

Hi, Is there a command available that makes the compiler ignore all write(*,*) statements?! The thing is, I'm working on a code which will eventually run for several hours (perhaps days) to complete a single run. At the moment I'm testing so I write a lot of data to the screen in order to...

What do the thinner and/or crossed out screen names mean?

Jeesh... I am sorry, but this just kills me. Serious faux-pizzle. I'll just post the link with a warning: Contains music with a potentially offensive word in it. http://www.youtube.com/watch?v=8oF1pf5V-SQ&feature=popular

Homework Statement A convex lens has a radius of 20mm and a focal length of 100mm. A point source of light is placed 500mm behind the lens and a screen is placed 120mm in front of it. Calculate (to first order) the size of the illuminated spot on the screen. Now calculate the distance at...

I'm trying to understand why certain objects work (i.e. register a touch) on an iPhone screen, but others don't. From what I've read, the screen consists of two transparent conductive layers separated by an insulating layer. Furthermore, each layer is etched to form parallel electrodes, and the...

Do you think it would be possible for a ipod sized device or small notebook to project an image rather then have an actual screen? So you could carry it in your pocket & when turned on the desplay could be massive like 50inches. Something holographic or what youd expect in the movies...

Hi guys and gals, I am looking for some free software that would allow me to capture what I am doing on my screen in a video format. Much like a screenshot captures a still shot of a particular screen, I would like to take a video. I have no budget for this so I was hoping it there was...

My housemates and I were having a discussion on how projectors work, and how they can project text on a white background. One idea was that white light is projected around the text with an absence of light where the text is, so it appeare relitively black. Then my friend posed the question of if...

In a typical color television tube, the electrons are accelerated through a potential difference of 25,000 Volts. What speed do the electrons have when they strike the screen? (qe = 1.6 x10-19 C, me = 9.1 x10-31 kg)

Long story short... I am having a hard time creating natural deceleration for a VB.NET touchscreen project. I would like to be able to scroll an object and allow it to coast to a stop. The starting velocity will be set by the swipe speed of the finger. Let's call it pixels/millisecond...

Dear all, I know there has been made a lot of posts about people having a BSOD problem but I cannot find the solution how to fix my friends problem, so my apologizes to make another post. My friend has a HP Pavilion notebook - windows vista - video card Nvida. Everytime as soon uses...

Recently going through threads on PF, the idea came to me, about how to set up a screen that has all the favorite links that with just a click of the mouse I can pull up a program for doing all the things needed, like check for meaning or spelling of a word, a units converter, using LaTEX (I'm...

Hi. It asks to calculate the focal length range of a projector of square pixel SXGA is from 4 to 12 m from the screen. It gives the diagonal size of the display (in mm) as well as the horizontal size (in m). The thing that am not sure about is how the focal length would be calculated with the...

my computer just got waves and shaking on the monitor tried a different monitor same result tryed reloading the ATI driver pack it got worse dumped everything in the V driver and reloaded still bad tried high and low rez and refresh rates high on both looked worse to the point of being...

I want to build a digital photo frame for my Mom for mothers day. I need to buy a lcd screen and can't find one for a good price. Where (other than ebay) could I find a good deal on a screen? I am looking for a size bigger than 6".

Man, I just found this video on youtube and the 3D effect is absolutely amazing... imagine playing a 3D shooting game with that! Furthermore, the effect can be done with very low cost as demonstrated in the video... here is the video https://www.youtube.com/watch?v=Jd3-eiid-Uw

I started playing the game Spore today, but the game keeps crashing with the blue screen, something about ialmdev5.DLL error. Please help.

Hello. I have a cylindrical Earth map of ratio 1:2. I also have a bunch of coordinates in longitude/latitude which I would like to plot. The problem is, how do I convert the longitude/latitude to screen coordinates (origin at the top left corner of the screen)?