How bright should a digital signage screen be for a window?
Brightness levels explained
Nits measure brightness. Indoor screens are typically 250-500 nits. For a window display, you need much higher brightness to compete with sunlight.
If the screen faces direct sun, you may need 2,500-3,500 nits or more. For a window with indirect light or shade, 700-1,500 nits can work. Some high-brightness displays also include anti-glare or anti-reflective coatings.
- Indoor (no window): 250-500 nits
- Shaded window: 700-1,500 nits
- Bright window, indirect sun: 1,500-2,500 nits
- Direct sunlight: 2,500-3,500+ nits
Other factors
Brightness alone isn't enough. Contrast ratio, anti-glare coating, and content design also affect visibility. Dark text on a bright background can be hard to read in sunlight.
Consider the time of day and direction the window faces. A west-facing window gets harsh afternoon sun, while a north-facing window may be easier to manage.
Content tips
Use high-contrast colors and large fonts. Avoid thin lines and low-contrast color combinations. Test your content at different times of day to see how it looks.
If you can't afford a high-brightness display, consider placing the screen deeper inside the window or using a shade or film to reduce glare.
Common mistakes
- Using a standard indoor display in a window and finding it looks washed out.
- Assuming higher brightness always solves glare—anti-glare coating matters too.
- Forgetting to test content in actual sunlight conditions before finalizing.