This UV light, all excited from its recent magical conjuring note: it's not magic , wants to get everything else in on the action. In the case of the subpixel, the only "else" that's there is a lining with a colored phosphor. When excited by the UV light, this phosphor emits its own light, either red, green, or blue, depending on the subpixel. Got that? In short, each subpixel creates light by energizing a phosphor, which glows a single specific color.
Not only does it glow a specific color, though, it glows one specific brightness. Each subpixel has only two states: on or off. Like a light switch. As you can imagine, this makes creating a normal-looking image rather tricky. After all, how do you get gray when all you can create is black or white?
Or to be specific, how do you create "purple" when all you can create is blue, magenta, red, or black? The trick is called " pulse-width modulation, " which is a fancy way of saying, you turn it on and off a lot, and really fast. Say you flip a light switch 10 times in a minute kids, don't try this at home. Evenly spaced, the light will be on for 6 seconds, then off for 6 seconds. For the whole minute, it's on for a total of 30 seconds, and off for 30 seconds, right?
Something like this:. On average, the total amount of light in the room is 50 percent of what's possible. You have a maximum light on and a minimum light off each half the time. If you increase how often you switch the light, so fast that you no longer see the light turn on and off, instead of a flashing light bulb, the room will just appear dimly lit.
Electric pulses must be sent at a rapid rate to plasma TV pixels for the pixels to remain lit. The sub-field drive specification states the rate of how many of these pulses are sent to the pixels each second to keep the frame visible on the screen.
If a plasma TV has a 60 Hz screen refresh rate, which is most common, and if the sub-field drive sends 10 pulses to excite the pixels within a 60th of a second, the sub-field drive rate is stated as Hz. Images look better and motion between each video frame looks smoother when more pulses are sent within the 60 HZ refresh rate time period. This is because pixel brightness doesn't decay as quickly during the time when a frame is displayed, nor when transitioning from frame to frame.
Although LCD and Plasma TVs outwardly look the same, there are internal differences in how each displays what you see on the screen. One unique difference in plasma TVs is the implementation of sub-field drive technology to enhance motion response.
Can you see a difference in image quality and motion between plasma TVs with sub-field drive rates of Hz, Hz, or Hz? The best way to find out is to do an eyes-on comparison to see what looks best to you.
You can find out your TV's refresh rate from the documentation that came with it, or you can do a Google search. You can't change the refresh rate on a plasma TV, but you can optimize your viewing by ensuring your source's refresh rate matches your TV. For example, if you're using a Blu-Ray player with a p 60Hz TV, make sure the player also outputs video at p and 60Hz.
TVs with a variable refresh rate support a specific range of refresh rates and adapt on the fly to what's shown on the screen. This is especially handy for gaming, where frame rates can vary from one moment to the next. Variable refresh rates also help lower power consumption on laptops and mobile devices when not in use. Right now, a native Hz refresh rate is the highest you can get on a 4K TV. It's especially helpful if you play video games. At a minimum, your TV should have a 60Hz refresh rate for a good viewing experience.
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