This is quite possibly the most common argument you’ll see about gaming mice online. Optical mice are better and more accurate than laser mice. Laser mice are garbage! Alas, more and more gaming mice use laser sensors, making optical mice all the more rare and special. So the story goes. But what’s the reality?
First off, laser sensors and optical sensors are more similar than you may think.
Chris Pate: “[In a ‘laser’ mouse], it’s actually not a laser sensor. It’s an optical sensor. It just uses a laser for illumination. But people find it easier to shorthand it to optical versus laser, even though it’s really infrared or red LED [for an optical mouse] versus VCSEL (vertical-cavity surface-emitting laser) ... it’s still an LED, but it’s a laser ... All the sensors are taking multiple thousands of pictures per seconds, comparing them to each other, and determining the translation direction and distance based on those images. ”
Both optical and laser-illuminated mice use CMOS sensors to take pictures of the surface beneath them, and use those pictures to determine movement. It’s a CMOS sensor like the one in your smartphone or digital camera, though the way it works is very different (for one thing, it’s taking thousands of images per second). So if the sensor itself is the same, what makes optical “better” than laser illumination?
Morier: “The laser light has a different wavelength. It is more looking into the structure of the material than the normal LED light, which is more surface illumination. It makes [the laser] more sensitive to the roughness of the surface....The LED is more staying on the top of the surface, so it’s very reproducible. On the top of the surface you have peaks, and it’s only counting the peaks.
“If you look at the cloth pads that are made out of a structure of fibers, the laser is so accurate it ... is showing you the nature of the structure. You don’t care about that. You just want to measure a distance ... The laser will really go down into the surface and then, especially at low speed, will behave very differently. This is the reason you have a big difference between low and high speed.”
Laser-illuminated sensors work extremely well on hard pads, but on soft pads with more surface depth, they’re picking up too much useless information, which leads to discrepancies in how they track at different speeds. This is what most people call “acceleration,” but Morier calls it “resolution error versus speed.” (More on that in a second).
So how much difference is there between optical and laser-illuminated sensors, ultimately? According to Morier, laser-illuminated sensors have a 5-6 percent variation in tracking at different speeds. For the best optical sensors, that number is below 1 percent.
This is quite possibly the most common argument you’ll see about gaming mice online. Optical mice are better and more accurate than laser mice. Laser mice are garbage! Alas, more and more gaming mice use laser sensors, making optical mice all the more rare and special. So the story goes. But what’s the reality?First off, laser sensors and optical sensors are more similar than you may think.Chris Pate: “[In a ‘laser’ mouse], it’s actually not a laser sensor. It’s an optical sensor. It just uses a laser for illumination. But people find it easier to shorthand it to optical versus laser, even though it’s really infrared or red LED [for an optical mouse] versus VCSEL (vertical-cavity surface-emitting laser) ... it’s still an LED, but it’s a laser ... All the sensors are taking multiple thousands of pictures per seconds, comparing them to each other, and determining the translation direction and distance based on those images. ”Both optical and laser-illuminated mice use CMOS sensors to take pictures of the surface beneath them, and use those pictures to determine movement. It’s a CMOS sensor like the one in your smartphone or digital camera, though the way it works is very different (for one thing, it’s taking thousands of images per second). So if the sensor itself is the same, what makes optical “better” than laser illumination?Morier: “The laser light has a different wavelength. It is more looking into the structure of the material than the normal LED light, which is more surface illumination. It makes [the laser] more sensitive to the roughness of the surface....The LED is more staying on the top of the surface, so it’s very reproducible. On the top of the surface you have peaks, and it’s only counting the peaks.“If you look at the cloth pads that are made out of a structure of fibers, the laser is so accurate it ... is showing you the nature of the structure. You don’t care about that. You just want to measure a distance ... The laser will really go down into the surface and then, especially at low speed, will behave very differently. This is the reason you have a big difference between low and high speed.”Laser-illuminated sensors work extremely well on hard pads, but on soft pads with more surface depth, they’re picking up too much useless information, which leads to discrepancies in how they track at different speeds. This is what most people call “acceleration,” but Morier calls it “resolution error versus speed.” (More on that in a second).So how much difference is there between optical and laser-illuminated sensors, ultimately? According to Morier, laser-illuminated sensors have a 5-6 percent variation in tracking at different speeds. For the best optical sensors, that number is below 1 percent.
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