What are the three layers of plasma screen, and what is the difference between plasma screen and LCD

The plasma screen is generally composed of three layers of glass panels. The inner surface of the first layer is a vertical grille coated with conductive material, the middle layer is an air chamber array, and the inner surface of the third layer is a horizontal grille coated with conductive material. To light up the air chamber at a certain address, first add a higher voltage to the corresponding line, and after the gas chamber is excited and lit, the brightness of the neon gas chamber can be maintained with low voltage.

Turn off a unit, just lower the voltage accordingly. The cycle time of the air chamber switch is 15 ms, and by changing the control voltage, the plasma plate can be made to display different gray scales.

Due to its ultra-thin body, large display area, and excellent display performance in a variety of environments, the plasma large screen has become the most advanced large-screen display device at present. The core component of the plasma splicing large screen is the plasma screen, which is different from the BSV LCD splicing in that it has some pixels, in which each pixel unit is composed of red, green and blue pixels, and the luminous phosphor on the inner surface of the outer screen is similar to the phosphor in the CRT picture tube, and the display mode of active luminescence of the phosphor can provide vivid and rich colors, extremely short response time and very wide viewing angle. Each pixel cell is controlled by a separate electrode, and after the signal is converted, each electrode responds, and each pixel is able to produce more than 16.7 million colors through a combination of three primary colors with different brightness.

The concept of ion display was first proposed by scientists at Illinois State University in the United States in July 1964, and the earliest experimental samples were just some simple luminescent lattices. The technology was further developed in the late sixties, but due to material and process limitations, the screen size was small and the display quality was poor.

The development of the computer and information industry has provided an opportunity for the progress of plasma display. The many advantages brought by the unique luminous principle and structure make plasma display gradually recognized as the most ideal large-screen display technology. Due to the application of new processes and materials, plasma display technology has been perfected day by day.

At present, there are seven manufacturers in the world with plasma screen (module) production technology and capabilities, and plasma large screens are being more and more widely used.

According to SRI's 2002 report, from 2001 to 2009, the world's plasma large screen industry will grow at an average annual rate of 58%, so it will become the most promising large-scale display device in the future and eventually replace the traditional CRT and back projection.

The LCD screen is clearer, the plasma screen protects the eyes, the plasma screen has little radiation, and the LCD screen has good brightness.

PDP does not need to be viewed in a dark environment, and there is no viewing angle problem, so you can see the best image quality in any position under any ambient light.

The panel size is large and the thickness is thin.

PDP is composed of each light-emitting monomer, so it is particularly clear and distinct, unlike CRT, which has uncomfortable visual sensations such as blurring, RGB primary colors are not concentrated, and the picture is crooked and flickering.

The electromagnetic radiation of plasma is only 1 100 to 1 1000 of CRT TVs.

It can be made into a wide screen.

Unlike liquid crystal or projection-based illumination principles, plasma displays emit light on their own (active self-illumination) by each pixel, resulting in a softer picture and a viewing angle of about 170 degrees. In addition, the reaction time of each pixel is short, the color saturation is high, and it is suitable for large sizes. Plasma TV is also a new technology that is very close to and surpasses the image tube TV in terms of overall picture quality performance.

In addition, it is radiation-free and immune to external magnetic interference, which is very beneficial for home viewing or theater loudspeaker proximity. For example, Panasonic's "Viera" series has launched a 150-inch plasma TV, and the Pioneer has also launched a "Pure Vision" plasma TV with an ultra-high color saturation of about 107% over the NTSC standard color gamut. When viewed in a bright environment, the brightness contrast is slightly inferior to that of an LCD monitor.

When a still screen is displayed for a long time, it is easy to have an afterimage when the screen is switched. It consumes a lot of power, and it is easy to generate high heat when displaying, so heat dissipation must be considered. Due to material and structural limitations, plasma displays cannot be developed to a small size of less than 20 inches, which is the biggest weakness in market competition.

Based on the above shortcomings, Japan's three major plasma display manufacturers: Panasonic (Panasonic PDP), Fujitsu Hitachi PDP, and Pioneer PDP have spent many years of continuous improvement. Most notably, in terms of power consumption, the average display time, including moving and static images, has been reduced to even lower than that of LCD monitors.

This improved technology is based on the light emitting characteristics, so that the PDP can use less power consumption when it displays dark colors. On the other hand, LCD displays still use the same power backlight module to provide a fixed intensity light source, so the total power consumption may exceed the PDP.

Short service life.

Take a 42-inch plasma display as an example, a plasma display of this size has 1 226 880 pixels, and the sub-field drive system The brightness control of the plasma display is achieved by changing the plasma discharge time, i.e., the sub-field drive technology. A subfield consists of three phases: initialization, writing, and maintenance.