When referring to the size of the screen of a TV or monitor, they indicate not the width and height, but the diagonal. Sometimes the visible part of the image is smaller than the CRT screen or LCD matrix. To find out if the manufacturer has deceived you, you can measure the diagonal yourself.
Instructions
Step 1
Tube TVs and monitors differ from each other in front panel design. In some of them, the CRT screen protrudes outward along with a small part of the side walls, while in others, part of its front surface is hidden under the frame. In the first case, the distance between the corners of the boundaries of the phosphor (and not the glass itself) is to be measured, and in the second, between the corners of the plastic frame.
Step 2
Use a standard ruler to measure the LCD screen or flat screen CRT. If the CRT screen is convex, you will have to use a flexible tailor's meter. A paper meter is also suitable, which can be taken at the stand with advertising brochures in some hardware stores. Do not use a metal tape measure - it can scratch the screen.
Step 3
On tube televisions and some older tube monitors, the screen is charged with static electricity during operation. After touching the screen, the charge is transferred to the person. After that, touching a grounded or just a massive metal object (even the antenna of the same TV), you can get a painful electric shock, and picking up a mobile phone or other electronic device - disable it. To prevent this from happening, leave the TV or monitor off for several hours before measuring the diagonal.
Step 4
The first measurement method is as follows. Use a ruler or flexible meter to measure the distance between the lower left and upper right corners of the screen. Do not apply significant force to it, especially if it is liquid crystal. Convert the measurement result expressed in centimeters or millimeters into inches: 1 inch equals 2.54 cm.
Step 5
To use the second method, measure the width and height of the screen separately. Then calculate the value of the diagonal using the Pythagorean theorem: d = sqrt (l ^ 2 + h ^ 2), where d is the diagonal, l is the width, h is the height. Conversion of the result to inches can be done both before and after the calculation.
