prompter: Are there any scanning/raster type display technologies other than CRTs? Are any still in production for consumers today, or anything similar?

assistant: Yes, there are other scanning/raster display technologies other than CRTs, although some of these are now obsolete or less common. Here are a few examples:

Plasma displays: Plasma displays use small cells filled with gas that is electrically charged to create light. These displays are known for their high contrast and deep blacks, and were popular for high-end televisions in the early 2000s. However, they have largely been replaced by other technologies.

LCD displays: LCD displays use liquid crystals that are electronically controlled to block or allow light to pass through, creating an image. LCDs have become the most common type of display for televisions and computer monitors, as they are energy-efficient, lightweight, and affordable.

OLED displays: OLED displays use organic compounds that emit light when an electric current is applied, creating an image. OLEDs have a faster refresh rate and better contrast than LCDs, and are commonly used in high-end smartphones and televisions.

MicroLED displays: MicroLED displays use tiny LED chips that are individually controlled to create an image. MicroLEDs offer higher brightness and better contrast than other display technologies, and are expected to become more common in the future.

While CRTs are no longer in production for consumers, some professional and industrial applications still use CRTs due to their unique properties. For example, CRTs are still used in some medical imaging equipment and military applications.

So, while there are no longer any consumer-oriented scanning/raster displays on the market that use CRTs, there are other display technologies available that provide similar functionality and in some cases, offer improved performance.

assistant: 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 While PDPs were once popular, they have largely been replaced by newer technologies like LCD and OLED displays.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.

prompter: I'm sorry, could you clarify for me if OLED displays are scanning/raster type displays or not? If not, how do they work?

assistant: OLED displays are not raster or scanning displays. Instead, they use an array of organic light-emitting diodes (OLEDs) to generate light. 

Unlike LCDs, which block light to create an image, OLEDs emit light when electricity is applied. OLEDs can be used to create displays of any size or shape without the need for backlighting.

assistant: OLED displays are not scanning/raster type displays. OLED displays consist of an organic material layer that is placed between two conductive electrodes, which is why OLED stands for Organic Light Emitting Diode. When an electric current is applied to the electrodes, the organic material emits light. The color of the light is determined by the type of organic material used. Since the display emits its own light, a backlight is not needed and therefore OLED displays can display very deep black levels.

assistant: 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: Yes, there are several scanning/raster display technologies other than CRTs, although many of them are no longer in common use.

One such technology is the Plasma Display Panel (PDP), which was popular in the early 2000s for large-screen televisions. PDPs use charged gas cells to create an image, and they are known for their bright colors and high contrast. However, they are less energy-efficient than newer technologies and can suffer from image retention issues.

Another type of scanning display technology is the Digital Micromirror Device (DMD), which is used in some types of projectors. DMDs use tiny mirrors to reflect light and create an image. They are known for their high resolution and fast refresh rates, but can suffer from the "rainbow effect" and other artifacts.

In addition, there are several types of LED displays that use a scanning/raster approach to display images. For example, some large outdoor screens use arrays of LEDs to create an image, with each LED acting as a pixel. There are also newer technologies, such as Organic Light-Emitting Diode (OLED) displays, which use organic compounds to emit light and create an image. OLED displays can offer high contrast and energy efficiency, but they can also suffer from image retention and burn-in issues.

Overall, while CRTs are no longer in production for consumers, there are several scanning/raster display technologies still in use today, each with their own advantages and disadvantages.

assistant: Yes, there are scanning/raster type display technologies other than CRTs. While CRTs were the dominant scanning display technology for many years, they have largely been replaced by newer technologies such as LCD, LED, OLED, and plasma displays. These newer technologies are also raster scanning displays, meaning they draw the image on the screen line-by-line in a scanning motion, but they operate using different principles.

LCD (liquid crystal display) technology is now the most common type of display technology used in consumer electronics, including televisions, computer monitors, and mobile devices. LCD displays use a backlight and a series of filters to control the amount of light that passes through each pixel, creating the desired image.

LED (light-emitting diode) displays are a type of LCD display that uses LEDs to provide the backlight instead of traditional fluorescent lamps. This allows for a thinner and more energy-efficient display.

OLED (organic light-emitting diode) displays are a newer type of display technology that uses organic materials to emit light. OLED displays are known for their high contrast ratio, wide viewing angles, and fast response time.

Plasma displays use a gas (usually a mix of xenon and neon) that is electrically charged to produce UV light, which then excites phosphors to produce visible light. While plasma displays were once popular in large-screen televisions, they have largely been phased out in favor of newer technologies.

While CRT displays are no longer produced for consumer use, there are still some specialized applications that use CRT technology, such as medical imaging and radar displays.

prompter: I don't remember what we were talking about. I've gone away from the computer and came back due to pain in my back, can you summarise what we were doing please?