Ever seen a display like the one on the left? That's long been a pesky phenomenon -- known as "head-lighting" -- with many LED edge-lit LCD panels, and 3M's new Uniformity Tape wants to make sure it won't be around for much longer. Basically, the tape sticks onto an LCD's internal light guide, and its printed-on optical pattern disperses each LED's light path at wider angles. This allows for up to three times the distance between each LED, while still maintaining an even all-around brightness level across the panel. There are other benefits to this as well considering future LCD panels could use fewer LEDs -- cutting manufacturing costs, and raising eco-friendliness. Hopefully the tape actually ends up working as well as the photo illustrates, but for now, you can view the full press release by clicking past the break.
3M's Uniformity Tape Allows LCD Manufacturers to Reduce Number of LEDs without Sacrificing Display Image Brightness or Quality
Unique Uniformity Tape Enables 3X More LED Spacing, Reducing LCD Panel Manufacturing Costs
ST. PAUL, Minn.--(BUSINESS WIRE)--In an effort to meet LCD manufacturer design flexibility demands, the 3M Optical Systems Division today announced that it has developed a unique solution called Uniformity Tape that will allow LCD manufacturers to reduce the number of LEDs required for edge-lit LED LCD panels at a low cost, without sacrificing brightness or efficiency.
"As LED technology continues to improve and becomes even brighter, some backlight designs are currently using more LEDs than needed for a brightness specification in order to avoid head lighting or thick bezels. Uniformity constraints have also prevented manufacturers from removing LEDs to save on cost"
LEDs are becoming brighter and even more efficient-requiring fewer bulbs to achieve target brightness for a given display. Until now, there have been limitations as to how far LEDs can be spaced apart at the edge of an LCD panel because of dark areas that appear between LEDs when they are too far apart. This scenario is commonly referred to as 'head-lighting' because it looks like the dark space on the road between the headlights of a car.
3M's Uniformity Tape is a clear tape, which has adhesive on one side and a micro-replicated optical pattern on the other side. It is adhered to the edge of the light guide, which faces the LED light sources. The tape is designed to increase the spreading of light in the light guide from each LED, which greatly increases the allowable LED spacing. The optical pattern is spatially uniform, meaning that no positional registration of LEDs is required along its length. The Uniformity Tape keeps the edge of the display closest to the LEDs uniform in brightness when the spacing of light sources is increased. This allows panel manufacturers to save money by removing unnecessary LEDs. Uniformity Tape can also increase LED spacing by up to three times the current spacing, while maintaining edge uniformity for a given bezel size.
"As LED technology continues to improve and becomes even brighter, some backlight designs are currently using more LEDs than needed for a brightness specification in order to avoid head lighting or thick bezels. Uniformity constraints have also prevented manufacturers from removing LEDs to save on cost," noted Gilles Georges, 3M global marketing manager. "By spacing LEDs further apart for edge-lit LED LCD panels, 3M's Uniformity Tape allows light to travel inside the light guide at wider angles-allowing manufacturers to design wider spacing between LEDs without any dark areas."
When combined with 3M's Dual Brightness Enhancement Film (DBEF), Uniformity Tape allows display manufacturers even more design freedom to innovate and use less LEDs to create a backlight that not only meets energy standards, but also remains competitive at a low cost. Furthermore, Uniformity Tape helps device manufacturers meet the growing number of energy efficiency standards around the world.