Here's a simple and quick test to see if the image quality of the LCD on which you are reading this page is OK.
Here you'll see three squares and in the centre of each white, gray and black square is a letter so faint it is barely distinguishable. Reading from left to right, the three letters spell out a word. Can you see the hidden word?
If you can't, the answer is 'LCD', however most will probably be able to read the letters that are concealed.
Next, a word is concealed in the four squares below. The letters are written in colors that are very similar to those of the boxes and we expect that, in many cases, it is hard to distinguish them in your browser. As a result, please save the image and check it closely in photo retouching software or a viewer that is capable of accurate colour reproduction.
The word hidden this time is 'EIZO' and if you can read the four letters, the display quality, or more accurately the still image gradation expression, of your LCD is extremely high.
If you couldn't read the word then it could be a problem with the lighting in the environment, however you should probably look at the display quality of your current LCD if you couldn't read them at all even when you stared at the screen.
for more information on LCD screens.