An LCD monitor, in the context of digital photography, refers to the colour liquid crystal display screen incorporated into the body of a digital camera - typically mounted on the rear panel - that serves as both a compositional viewfinder for framing and previewing shots in live view mode and as a playback screen for reviewing, inspecting, and managing images that have already been captured and stored on the camera's memory card.
The LCD monitor first appeared in consumer imaging devices on camcorders, where the ability to compose shots using a fold out screen rather than a traditional eyepiece viewfinder offered significant practical advantages for handheld video recording. The technology was subsequently adopted by digital still cameras as they evolved and matured through the 1990s, becoming a standard feature on virtually all but the most basic and inexpensive models. Today the rear LCD monitor is considered an essential and expected feature of any digital camera, regardless of price point or intended use.
As a compositional tool, the LCD monitor displays a real time live view feed from the camera's image sensor, allowing the photographer to frame and compose shots while holding the camera at arm's length or in positions where raising the camera to the eye would be impractical or uncomfortable. This capability is particularly valuable for shooting from unusual angles - close to the ground, held overhead, or around corners - and for macro and close up photography where precise framing and focus confirmation benefit from the larger, more detailed view offered by the monitor compared to a small optical viewfinder.
For image review and playback, the LCD monitor allows photographers to inspect captured images immediately after shooting, assessing composition, focus accuracy, and exposure quality in the field before deciding whether to reshoot. Most cameras allow images to be magnified on screen for critical focus checking, and display exposure data including histograms that allow the tonal distribution of the image to be assessed objectively. The monitor also serves as the interface for navigating the camera's menu system, where shooting parameters, image quality settings, and camera configuration options can be selected and adjusted through on screen menus controlled by buttons, dials, or touchscreen interaction.
The quality of LCD monitors has improved dramatically over successive generations of digital cameras, with screen sizes, pixel resolutions, brightness levels, and colour accuracy all advancing significantly. Many modern cameras feature high resolution monitors of three inches or larger, with brightness levels sufficient for comfortable viewing in direct sunlight, and articulated or fully tilting designs that allow the screen to be angled to suit a wide variety of shooting positions and orientations.