What a digital rear view mirror is and why cars have them
A digital rear view mirror is a screen mounted where a traditional mirror would be, showing a live video feed from a camera mounted on the back of your car. Instead of reflecting light like a glass mirror, it displays what that camera sees in real time on a small LCD or OLED screen. The camera sits high on the rear of the vehicle, usually near the roof line, so it captures a wider and taller view than a traditional mirror can show.
Car makers install these for one practical reason: they give you a clearer view of what is directly behind you, especially in situations where a traditional mirror would show mostly the trunk lid or the heads of tall passengers in the back seat. The camera sits above the sightline that a mirror reflects, so you see the road and other vehicles instead. Some drivers find this less tiring on long drives because the image does not shift as much when you move your head.
Digital mirrors are optional on most vehicles that offer them — you can usually choose the traditional mirror instead. A few high-end models make them standard. They are most common on luxury sedans and SUVs, though some mainstream brands now include them as an upgrade option.
Key Takeaways
- A digital rear view mirror shows a camera feed on a screen instead of reflecting light, giving you a wider vertical view of the road behind you.
- The camera sits higher than a traditional mirror, so it avoids showing the trunk lid or tall rear passengers blocking your view.
- You can usually toggle between the camera view and a traditional mirror view with a button on the mirror itself.
- The main trade-off is that a screen can fail or lose power, whereas a traditional mirror works as long as the glass is intact.
- Digital mirrors do not replace your side mirrors or backup camera — they work alongside those systems.
How the camera and screen work together
The camera is a small, weather-sealed unit mounted on the back of the car, usually centered near the roof line. It sends a video signal to the screen in the mirror housing, which displays the feed with very little delay — typically under 100 milliseconds, fast enough that you do not notice lag. The entire system draws power from your car's electrical system, the same way your headlights and wipers do.
Most digital mirrors have a button or toggle on the mirror itself that lets you switch between the camera view and a traditional reflective mirror view. This is useful if the camera gets dirty, fogged up, or if you straightforward prefer the traditional mirror in certain situations. Some systems also let you adjust the brightness of the screen to match the lighting around you, so glare does not wash out the image at night or in bright sunlight.
The screen is usually smaller than you might expect — often just a few inches wide — because it is mounted in the same space where a traditional mirror would hang. Despite the small size, the camera's wide field of view means you see more of the road behind you than a traditional mirror shows.
What you see compared to a traditional mirror
A traditional mirror reflects only what is directly in its line of sight. If a tall passenger sits in the back seat, their head can block your view of traffic behind the car. If the trunk is tall or the rear window is small, you might see mostly metal and glass instead of the road. A digital mirror avoids this because the camera is positioned above these obstacles and points downward at an angle, so it captures the road surface and vehicles behind you even when the back seat is full.
The camera also has a wider horizontal field of view than most traditional mirrors — roughly 50 to 60 degrees compared to 30 to 40 degrees for a typical mirror. This means you see more of the lanes to your left and right without turning your head as far. In heavy traffic or when changing lanes, this wider view can help you spot vehicles in your blind spots sooner.
The trade-off is that the screen shows a flat, two-dimensional image. A traditional mirror gives you some depth perception because your eyes can judge distance based on the angle of reflection. With a screen, you rely more on the size of objects and their position to judge how far away they are. Most drivers adjust to this within a few drives, but it is a real difference in how the information reaches your brain.
When the camera view is blocked or fails
Rain, snow, mud, or condensation can coat the camera lens and make the image blurry or unusable. Unlike a traditional mirror, which you can wipe clean with your hand, a digital camera is mounted high on the back of the car where you cannot easily reach it. Some vehicles include a heating element on the camera lens to prevent fogging, similar to how rear window defrosters work. Others rely on the camera's position — high and exposed to airflow — to stay relatively clean.
If the camera fails completely, the system usually falls back to a traditional reflective mirror surface, or the screen goes dark and you lose the view entirely. This depends on how the manufacturer designed the system. A few vehicles have a small traditional mirror built into the same housing as the screen, so you always have a backup. Others do not, which means a camera failure leaves you without a rear view until it is repaired.
Power loss is rare but possible. If your car's electrical system fails or the battery dies, the screen will not display anything. A traditional mirror works regardless of power, which is one reason some drivers prefer them for reliability.
How digital mirrors differ from backup cameras
A backup camera is a separate system that shows you what is directly behind the car when you shift into reverse. It displays on your dashboard screen or infotainment system, not on the rear view mirror. A digital rear view mirror shows you the same view all the time — whether you are driving forward, stopped, or in reverse — and it displays on the mirror itself.
Backup cameras are now standard on all new cars sold in the United States, required by federal safety rules. Digital rear view mirrors are optional upgrades. The two systems work independently and serve different purposes: the backup camera helps you avoid hitting something when you are backing up, while the digital mirror helps you see traffic and obstacles while you are driving forward.
Some vehicles combine the two: the digital mirror shows the forward view most of the time, but when you shift into reverse, the screen switches to show the backup camera feed. This gives you the best of both systems without requiring you to look at multiple screens.
Cost and availability across vehicle brands
Digital rear view mirrors are most common on luxury brands like BMW, Mercedes-Benz, Audi, and Lexus, where they are often included as standard or offered as a mid-level upgrade. Some mainstream brands like Honda, Toyota, and Chevrolet now offer them as optional add-ons on select models, usually costing between $500 and $1,500 depending on the vehicle and what other features are bundled with the upgrade.
The cost varies widely because the price depends on what else comes with the system. Some packages include the digital mirror alone. Others bundle it with a premium infotainment system, surround-view cameras, or other safety features, which raises the total price. If you are shopping for a vehicle and interested in a digital mirror, check the manufacturer's website or window sticker to see whether it is offered on the specific model and trim level you are considering.
Aftermarket digital mirrors — systems you can install on a car you already own — exist but are rare and often expensive. Most are designed for commercial vehicles like trucks and buses rather than passenger cars. If you want a digital mirror on your current car, your best option is usually to trade in or purchase a vehicle that has one built in from the factory.
Maintenance and what can go wrong
Digital mirrors require less maintenance than you might think. The main concern is keeping the camera lens clean. In winter, road salt and grime accumulate faster. In summer, bugs and dust are common. A soft cloth and water usually clean the lens without damage, but you need to reach it safely — which often means using a ladder or waiting until the car is in a garage.
The screen itself is durable and rarely fails during the life of the vehicle. If it does, replacement usually means replacing the entire mirror housing, which can be expensive — often $800 to $2,000 depending on the brand. This is one reason some drivers choose the traditional mirror option when given the choice: a broken traditional mirror is cheaper to replace, and you can even use a temporary solution like duct tape until you get it fixed.
Electrical connections inside the mirror can corrode if water gets inside the housing, though modern seals make this uncommon. If the mirror stops working, the first step is usually to check your car's fuses and electrical connections. If those are fine, the mirror itself likely needs professional service.
Frequently Asked Questions
Can I switch back to a traditional mirror if I do not like the digital one?
Most vehicles that offer digital mirrors let you toggle between the camera view and a reflective mirror view using a button on the mirror. Some cars have a small traditional mirror built into the same housing. If you want to remove the digital mirror entirely and install a traditional one, that is usually possible but requires professional installation and may cost $500 to $1,000 depending on the vehicle.
Does a digital mirror work at night?
Yes, but the image quality depends on your car's headlights and the ambient light behind you. The camera uses the same light that your eyes use to see the road, so if it is very dark, the image will be darker too. Some systems include infrared or low-light enhancement to improve the image in darkness, similar to how some backup cameras work.
What happens if the camera gets dirty or fogged up?
The image becomes blurry or unusable. You can clean the lens with a soft cloth and water if you can safely reach it. Some vehicles have a heated lens to prevent fogging in cold or wet weather. If the camera is too dirty or damaged to clean, you will need professional service to replace it.
Is a digital mirror safer than a traditional mirror?
The wider field of view can help you spot vehicles sooner, which some drivers find safer. However, the flat two-dimensional image means you lose some depth perception. Safety depends more on your driving habits and attention than on which type of mirror you use. Both systems work well when used correctly.
Do I need a digital mirror if my car already has a backup camera?
No. A backup camera and a digital rear view mirror serve different purposes. The backup camera helps when you are reversing, while the digital mirror helps when you are driving forward. You can have one, both, or neither depending on what your vehicle offers and what you prefer.