The bar that stretches across the center of the image is one constant shade of gray ( RGB: 142, 142, 142) but it appears to be lighter in on the dark side of the gradient and darker on the light side of the gradient. Refer to the optical illusion image above to see the effect made apparent. First, the additional indirect lighting provided by the bias lighting increases the contrast of the on-screen image, making your picture look better. If you still need some convincing that extends beyond saving your poor eyes from fatigue, then consider two other great benefits. This raises the surrounding light levels in your viewing area without shining light toward your eyes or toward the screen itself. Because the light originates outside of the sight line of the viewer and is not in a direct path to reflect onto the screen, you get all the benefits of increased light in the room without the problems of glare or light shining directly from the source into your eyes. Unlike regular lighting, bias lighting is placed behind the screen you are viewing. DIFFUSION SCREEN LIGHTS BEHIND TVIt may not be as intense as the kind of eyestrain you get staring bleary eyed at a bright TV in the dark, but it’s eye strain nonetheless-and it makes the picture look worse, to boot. This decreases contrast, introduces glare and haze to the image, and creates its own kind of eyestrain as a result. Lighting that is to the side or behind the viewer projects light onto the viewing surface. However, it introduces a whole new host of problems. Turning on these lights while watching TV does in fact mitigate the issue of the bright screen framed against a very dim room. In your typical living room or workspace, you have ceiling lights, floor lamps, and table lamps-all of which are typically located either above or, in the case of maps and accent lighting, in front of the screen at roughly the same height as the viewer’s head. Let’s look at this 3D mockup of a pretty typical living room setup to illustrate how common lighting configurations are problematic for screen viewing (although this mockup is centered on an HDTV, the same lighting problems apply to workstations too). So, how do you avoid the inevitable exposure to bright light while viewing your TV or monitor? The key is to increase the general luminance in the room without introducing problems that arise from just indiscriminately flipping all the lights on. DIFFUSION SCREEN LIGHTS BEHIND MOVIEThat doesn’t mean you need to endure it every time you use your workstation or watch a movie on your beautiful new HDTV, though.īias lights can help a lot. In worst case scenarios, with extended exposure some people experience ocular migraines-visual disturbances or even extreme headaches that result from intense eye strain.įortunately, despite the fact that your mother might have insisted watching too much TV or TV with the lights off would make you go blind, the effects of such eye strain are temporary and within less than a day of exposure, the symptoms of dry eyes and fatigue should resolve themselves. With extended exposure, you’ll likely experience dry or watery eyes, general discomfort, and even tension headaches radiating out from the temple area. Second, and more important, your eyes can become rapidly fatigued. Your eyes will perceive richer dark areas if the surrounding field of vision is not as dark. First, you’re not seeing as clear a contrast onscreen if the rest of the room is dark. Instead, they adjust to the average brightness across your entire field of view. However, your eyes don’t adjust to the average level of brightness displayed onscreen. Your eyes accurately perceive the screen to be very bright in relationship to the rest of the room. When you watch television or use a computer in a dark room, your eyes stare intently at a small window of very bright light that is floating in the sea of darkness around the screen.
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