There are some newer digital cameras on the market that are fitted with an electronic viewfinder. These are in fact very small LCD screens (often just 0.5” diagonally) which project a live view of the scene as seen
by the CCD.
The advantages of this type of viewfinder are that it doesn’t suffer from parallax like most optical viewfinders. Electronic viewfinders show exactly what will be captured, since you look at your subject straight through the lens.
Because they are usually recessed behind an eyecup, they are clearly visible in daylight. Besides showing aperture and shutter speed settings, electronic viewfinders may also show the camera's menu settings of the image to be captured.
A few of its weaknesses are that, since they are electronic, they use battery power and - just like the LCD screen - the image they show is usually quite bright. This makes it difficult to check correct exposure or image brightness.
A further disadvantage is that, because electronic viewfinders are quite coarse as compared to optical systems, it is almost impossible to check finer details in an image, such as whether a subject has its eyes open or closed.