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Want to see what PhotoUp can do? Sign up for a trial account today! By browsing this website, you agree to PhotoUp using cookies to provide you a more personalized browsing experience. I agree. The only way we can see that this is actually happening is to blow the dots up so big that our brains can no longer assemble them, like this:. Most people, sitting right up close to their computer screens , cannot tell what this is a picture of -- the dots are too big for your brain to handle.
If you stand 10 to 15 feet away from your monitor, however, your brain will be able to assemble the dots in the image and you will clearly see that it is the baby's face. By standing at a distance, the dots become small enough for your brain to integrate them into a recognizable image. Both televisions and computer screens as well as newspaper and magazine photos rely on this fusion-of-small-colored-dots capability in the human brain to chop pictures up into thousands of individual elements.
On a TV or computer screen, the dots are called pixels. The resolution of your computer's screen might be x pixels, or maybe x pixels. The human brain's second amazing feature relating to television is this: If you divide a moving scene into a sequence of still pictures and show the still images in rapid succession , the brain will reassemble the still images into a single, moving scene.
Take, for example, these four frames from the example video:. Each one of these images is slightly different from the next.
If you look carefully at the baby's left foot the foot that is visible , you will see that it is rising in these four frames.
The toy also moves forward very slightly. By putting together 15 or more subtly different frames per second, the brain integrates them into a moving scene. Fifteen per second is about the minimum possible -- any fewer than that and it looks jerky. When you download and watch the MPEG file offered at the beginning of this section, you see both of these processes at work simultaneously. Your brain is fusing the dots of each image together to form still images and then fusing the separate still images together into a moving scene.
Without these two capabilities, TV as we know it would not be possible. A few TVs in use today rely on a device known as the cathode ray tube , or CRT , to display their images.
LCDs and plasma displays are other common technologies. It is even possible to make a television screen out of thousands of ordinary watt light bulbs! You may have seen something like this at an outdoor event like a football game.
Let's start with the CRT, however. The terms anode and cathode are used in electronics as synonyms for positive and negative terminals. For example, you could refer to the positive terminal of a battery as the anode and the negative terminal as the cathode.
In a cathode ray tube, the "cathode" is a heated filament not unlike the filament in a normal light bulb. The heated filament is in a vacuum created inside a glass "tube. Electrons are negative. The anode is positive, so it attracts the electrons pouring off the cathode. In a TV's cathode ray tube, the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode. This tight, high-speed beam of electrons flies through the vacuum in the tube and hits the flat screen at the other end of the tube.
This screen is coated with phosphor, which glows when struck by the beam. There is a cathode and a pair or more of anodes. There is the phosphor-coated screen. There is a conductive coating inside the tube to soak up the electrons that pile up at the screen-end of the tube. However, in this diagram you can see no way to "steer" the beam -- the beam will always land in a tiny dot right in the center of the screen. That's why, if you look inside any TV set, you will find that the tube is wrapped in coils of wires.
On the next page, you'll get a good view of steering coils. The steering coils are simply copper windings see How Electromagnets Work for details on coils. These coils are able to create magnetic fields inside the tube, and the electron beam responds to the fields. One set of coils creates a magnetic field that moves the electron beam vertically, while another set moves the beam horizontally. By controlling the voltages in the coils, you can position the electron beam at any point on the screen.
A phosphor is any material that, when exposed to radiation, emits visible light. The radiation might be ultraviolet light or a beam of electrons.
Any fluorescent color is really a phosphor -- fluorescent colors absorb invisible ultraviolet light and emit visible light at a characteristic color. In a CRT, phosphor coats the inside of the screen. When the electron beam strikes the phosphor, it makes the screen glow.
In a black-and-white screen, there is one phosphor that glows white when struck. In a color screen, there are three phosphors arranged as dots or stripes that emit red, green and blue light. There are also three electron beams to illuminate the three different colors together. There are thousands of different phosphors that have been formulated. They are characterized by their emission color and the length of time emission lasts after they are excited.
In a black-and-white TV, the screen is coated with white phosphor and the electron beam "paints" an image onto the screen by moving the electron beam across the phosphor a line at a time. To "paint" the entire screen, electronic circuits inside the TV use the magnetic coils to move the electron beam in a " raster scan " pattern across and down the screen.
The beam paints one line across the screen from left to right. It then quickly flies back to the left side, moves down slightly and paints another horizontal line, and so on down the screen.
In this figure, the blue lines represent lines that the electron beam is "painting" on the screen from left to right, while the red dashed lines represent the beam flying back to the left. When the beam reaches the right side of the bottom line, it has to move back to the upper left corner of the screen, as represented by the green line in the figure. When the beam is "painting," it is on, and when it is flying back, it is off so that it does not leave a trail on the screen.
The term horizontal retrace is used to refer to the beam moving back to the left at the end of each line, while the term vertical retrace refers to its movement from bottom to top.
As the beam paints each line from left to right, the intensity of the beam is changed to create different shades of black, gray and white across the screen. Because the lines are spaced very closely together, your brain integrates them into a single image. A TV screen normally has about lines visible from top to bottom.
In the next section, you'll find out how the TV "paints" these lines on the screen. Standard TVs use an interlacing technique when painting the screen. In this technique, the screen is painted 60 times per second but only half of the lines are painted per frame. Next, turn on the devices again and connect them with the new cable.
Ordered before Sunday , delivered Monday for free Free exchange Most customer-friendly webshop Business Stores Customer Service. Home All TVs. Written by Laurence 13 September This isn't a reason to panic, because the solution is usually very simple. Follow the steps in this article first. If you still don't see any images afterward, please contact the customer service.
Solve no image in 6 steps Hopefully, following the next 6 steps will solve the problem. Step 1: does the television turn on? Step 2: does the TV respond to the remote? Press the menu button on your remote control. Replace the batteries in your remote. Step 3: select the correct source. Step 4: check the connected device. Step 5: reset the television. How do I reset my TV to the factory settings?
Step 6: replace your HDMI cable.
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