If you bought a TV set from the late 1960s to the early 20th century, it may be a cathode ray tube (CRT) TV set. Each cathode ray tube device has a vacuum tube with an electron gun, which can emit red, green and blue electrons to the screen. Light scans a dark screen, producing thousands of red, green or blue dots to create an image.
This technology has occupied three quarters of a century. In 2007, the sales of slimmer and more functional LCD TVs surpassed those of CRT TVs.
Flat-panel TV began to appear in the late 1990s. Their direct advantages over CRT are saving space, lighter weight, being able to be mounted on the wall and having a larger screen size.
At the beginning of the 20th century, there were two flat panel technologies: liquid crystal or plasma. The LCD panel has a backlight made of CCFL lamps, which emits light through a polarization filter and a color matrix of color liquid crystals. Each cell creates an image of a different color. The plasma screen consists of thousands of batteries between glass plates. Each cell (or pixel) keeps the air, and reacts when the charge passes, and emits red, green or blue light according to the current.
Plasma equipment has excellent black level, contrast, better viewing angle and high refresh rate (which means less blur in fast-moving actions). However, their energy consumption is higher than that of LCD, and with the decline in the price of LCD components, they are finally replaced by LCD and LED technology. In 20 14, Panasonic and other manufacturers stopped producing plasma batteries.
The development of digital TV technology has changed the way we watch TV, which can be said to be the most important technological development. From 2008 to the end of 20 15, China changed from analog signal to digital signal. The analog signal is gradually turned off and the digital signal is gradually enhanced. For consumers, if your TV doesn't support digital signals, you must buy a new digital TV.
The resolution of HDTV (or HD) is up to 5 times that of SD, that is, 1280x720p or 1920x 1080p.
The higher the resolution, the more lines, clearer, richer and more detailed the image. Undoubtedly, with the advent of HDTV, stars began to worry that their flaws and wrinkles would become more obvious.
At the beginning of 20 10, 3D TV was hyped and publicized. The development of 3D technology has promoted the great success of 3D movies such as Avatar and the sales of 3D TV sets.
Despite the efforts of TV manufacturers, 3D TV has not been recognized by the public. 3D doesn't look particularly comfortable. You must wear glasses. You need to sit directly in front of the equipment to get good results. Secondly, the content is not enough. In the end, 3D has become an outdated fashion, an unnecessary technology, and has not made the public's daily TV viewing experience better.
In the middle of 20 10, LED screens became popular. This technology is similar to LCD, but uses micro LED as backlight instead of CCFL lamp. There are two different types of LED TVs: the side light panel has lights at the edge of the screen, which makes it thinner and more energy-saving; The backlight panel has an led on the back of the screen, which means that the image will be more consistent.
A TV set called a "smart" TV has a built-in Internet connection function. This allows them to connect to the Internet through the built-in Wi-Fi.
At present, all major TV manufacturers produce smart TVs that support streaming content or applications that use additional functions. Including Tencent video, iQiyi, Youku video and other smart TV platforms.
Organic light emitting diode (OLED) TV is a variant of LED, but it has no backlight. This makes them only 1 mm, which is very thin.
Each pixel lights up individually, so when they are turned off, the black display is very dark. The response time of OLED panel is 1000 times faster than that of LED, which is very suitable for fast moving images. Organic light emitting diodes also have physical flexibility. At CES 20 19, LG showed a roll-up screen, which can greatly change the appearance of home TV and open up the possibility of scrolling TV.
At present, organic light-emitting diodes are more expensive than other types of televisions. With the improvement of production technology, the manufacturing cost will be reduced and may be popularized soon.
Video on demand allows you to choose exactly what you want to watch, so you won't be dominated by live TV. If there is a TV box, you can control the time of watching the program. It's not just that technology is getting better and better. This is a golden age for TV.
Ultra HD or 4K refers to a device with a minimum resolution of 3840×2 160, which is four times that of a full HD pixel. The advantage of this high resolution is that you will be able to see the details. From the petals to the sweat on the face of football players, the image will be very realistic and close to reality. With more and more content of Ultra HD /4K, and the price of Ultra HD /4K TV has dropped in the past few years, I believe it will be recognized and popularized by the public soon.