Backlight or more commonly the inverter sounds like its blown. This controls the brightness control by putting more or less wattage through the light. However, when they are gone its extremely hard to see the picture onscreen.
Good reason for them to goto OLED displays as these dont require such parts.
Its time to go LCD, you'll love how rich the colors are and more desktop space.
You'll get rich colors if you avoid those cheap ass monitors that uses TN panels which has basically infected just about all sizes of LCD monitors. Basically that means you'll have to avoid all 22" monitors with the exception of the Lenovo ThinkVision L220x; which is about $500.
As for 24" monitors, basically any monitor selling for less than $575 online basically uses a cheap ass TN panel; unless it's on sale.