Are there any scanning/raster type display technologies other than CRTs? Are any still in production for consumers today, or anything similar?
user
There are several scanning/raster type display technologies other than CRTs, including Plasma display panels (PDP), Digital Light Processing (DLP), and Cathode Ray Tube Rear Projection (CRT RP). While PDPs were once popular, they have largely been replaced by newer technologies like LCD and OLED displays. DLP is commonly used in projectors and some TVs, while CRT RP was popular in the late 1990s and early 2000s. While newer technologies have largely replaced scanning/raster type displays, some are still used in niche applications such as projectors and large-screen displays.
assistant
I'm sorry, could you clarify for me if OLED displays are scanning/raster type displays or not? If not, how do they work?
user
OLED displays are not scanning/raster type displays like CRT or LCD displays. Instead, they use an emissive display technology where each individual pixel emits its own light, eliminating the need for a separate backlight like in LCD displays.

In OLED displays, each pixel is made up of an organic material that emits light when an electric current is applied to it. The color of the light emitted is determined by the specific organic material used. The pixels are arranged in an array, and when a voltage is applied to a specific pixel, it emits light, creating the image on the screen.

Unlike scanning/raster displays, OLED displays do not have a refresh rate or a scan rate. The individual pixels can be turned on and off instantly, allowing for fast response times and high contrast ratios. This is why OLED displays are often used in high-end smartphones and TVs, as well as in virtual reality and other immersive technologies where fast response times and high contrast are important.
assistant