One type of digital tube is a semiconductor light-emitting device. The working principle of the digital tube is to drive each segment code of the digital tube through the I/O port of the single-chip microcomputer, light up different segment codes to form a character and display the number we want.
The digital tube is a type of device that is inexpensive and easy to use, and that inputs relative currents to different pins to make it bright, thereby displaying the digital displayable parameters such as time, date, temperature, and all available digital representations. In electrical appliances, especially home appliances, the application of a wide range of areas, such as displays, air conditioners, water heaters, refrigerators and so on. The vast majority of water heaters use digital tubes, and other home appliances also use LCD screens and fluorescent screens.
The digital tube is also called the LED digital tube. People in different industries have different names for the digital tube. They are actually the same products. The digital tube can be divided into seven digital tubes and eight digital tubes according to the number of segments. The eight-segment digital tube has one more LED unit than the seven-segment digital tube. That is, one more decimal point (DP) can represent the digital tube more accurately. To display the content; according to how many can be displayed (8) can be divided into 1, 2, 3, 4, 5, 6, 7 and other digital control.
The anodes of the 8 LEDs of the common anode digital tube (positive diode terminals) are connected together. Normally, the common anode is connected to a high level (generally connected to the power supply), and other pins are connected to the segment to drive the output of the circuit. When the output terminal of a certain driving circuit is at a low level, the field connected to the terminal is turned on and lights up. Various numbers or characters may be displayed according to different combinations of light emitting fields. At this time, the segment driving circuit is required to absorb the rated segment conduction current, and the corresponding current limiting resistance is determined according to the external power supply and the rated segment conduction current.
The cathodes (negative diode terminals) of the 8 LEDs of the common cathode digital tube are connected together. In general, the common cathode is connected to a low level (generally to ground), and other pins are connected to the segment to drive the circuit output. When the output terminal of a certain driving circuit is at a high level, the field connected to the terminal is turned on and lights up, and various numbers or characters can be displayed according to different combinations of light emitting fields. At this time, the segment driving circuit is required to provide the rated segment conduction current, and the corresponding current limiting resistance is determined according to the external power supply and the rated segment conduction current.
The advantages of the digital tube1, strong and durable
LED digital tube is completely encapsulated in epoxy resin. LED digital tube is stronger than light bulb and fluorescent tube. There are no loose parts in the LED digital tube light. These characteristics of the LED digital tube make the light-emitting diodes not easily damaged.
2, high energy saving
LED digital energy-saving energy is pollution-free environmental protection, LED digital tube DC drive, ultra-low-power electric light power conversion close to 100%, and LED digital tube lighting effects than traditional light energy saving more than 80%.
3, long life
The LED light source of the LED digital tube is known as a longevity light, meaning a never-extinguishing light. LED digital tube solid cold light source, LED digital tube epoxy resin package, LED digital tube lamp body is also not loose part, LED digital tube does not exist filament light easy to burn, heat deposition, LLED digital tube light decay and other shortcomings, LED digital tube The service life can reach 60,000 to 100,000 hours, and LED digital tubes can last 10 times longer than traditional light sources.
4, changeable
LED digital tube LED light source can use the principle of red, green, blue three colors, LED digital control under the control of the computer technology so that three colors with 256 gray levels and arbitrary mixing, LED digital tube can produce 256 × 256 × 256 = 16777216 kinds of colors, LED digital tube forming different light color LED digital tube combination change, to achieve a variety of LED digital tube dynamic effects and various digital LED tube images.
The digital tube is one of the types of displays. By inputting relative currents to different pins, it lights up, showing that the numbers can display parameters such as time, date, temperature, and all available numbers.
Because it is cheap and easy to use, it is widely used in electrical appliances, especially home appliances, air conditioners, water heaters, refrigerators and so on. The vast majority of water heaters use digital tubes, and other home appliances also use LCD screens and fluorescent screens.
The liquid crystal display is based on a liquid crystal material. A liquid crystal material is filled between the two parallel plates. The voltage of the liquid crystal material changes the state of the internal molecules of the liquid crystal to achieve the purpose of shading and light transmission to display various shades. There is a vivid image, and as long as a three-color filter layer is added between the two plates, a color image can be displayed. The power consumption of LCD is very low, so it is favored by engineers and is suitable for electronic devices using batteries.
How the LCD worksThe liquid crystal panel is a type of image forming apparatus produced by utilizing the optical rotation effect of liquid crystal molecules. The main principle is to use the optical rotatory effect of a specific substance (liquid crystal substance), and the principle that the liquid crystal molecules will change arrangement in the electric field to control the intensity of the polarized light passing through the liquid crystal so as to achieve the purpose of visualization.
In simple terms, the basic principle that the screen can display is to fill the liquid crystal material between the two parallel plates. The overvoltage can change the arrangement of molecules inside the liquid crystal material to achieve the purpose of shading and light transmission to display different shades of light. There is a vivid image, and as long as a three-color filter layer is added between the two plates, a color image can be displayed.
Like tiny, blinds controlled by electric fields. The liquid crystal molecules are one by one sash. Therefore, all the screens manufactured using this principle are collectively referred to as liquid crystal screens, regardless of AV IPS TFTs and the like, because the essence is the principle of the used liquid crystals.
1. The liquid crystal must be poured between two flats with fine grooves to work properly. The grooves in the two planes are perpendicular to each other (90 degrees), that is, if the molecules in one plane are aligned in the north-south direction, the molecules in the other plane are arranged in the east-west direction, and the molecules located between the two planes are Forced into a 90-degree twisted state. Because the light travels in the direction of the molecules, the light is also twisted 90 degrees when passing through the liquid crystal. However, when a voltage is applied to the liquid crystal, the molecules are re-arranged vertically so that the light can be emitted directly without any twisting.
2. It depends on polarizing filters and the light itself, natural light is randomly scattered in all directions, polarization filter is actually a series of increasingly fine parallel lines. These lines form a net that blocks all light that is not parallel to these lines. The lines of the polarizing filter are exactly perpendicular to the first, so they can completely block those rays that have been polarized. Only if the lines of the two filters are completely parallel, or the light itself has been twisted to match the second polarizing filter, the light can penetrate. On the one hand, the LCD is composed of such two mutually perpendicular polarization filters, so under normal circumstances it should block all light that tries to penetrate.
However, because the two filters are filled with twisted liquid crystals, after passing through the first filter, the liquid crystal molecules are twisted by 90 degrees, and finally pass through the second filter. On the other hand, if a voltage is applied to the liquid crystals, the molecules will be rearranged and completely parallel, so that the light is no longer twisted, so it is blocked by the second filter. In short, light is blocked by power-up, and light is emitted without power. Of course, it is also possible to change the arrangement of the liquid crystals in the LCD so that light is emitted when it is powered on and is blocked when it is not powered. However, since the LCD screen is almost always lit, only the “power-on-light blocking†scheme can achieve the goal of the most power saving.
1, the price difference:
In general, digital tubes are cheaper than liquid crystal display modules.
2, display characteristics:
The digital tube is scanned by the electron gun to electron image, and the liquid crystal display module is the light through the liquid crystal.
The digital tube displays a single content and the liquid crystal is more abundant;
Digital tube is generally a 7-segment 8 character, of course, there are 16-segment mid-size characters, LCD can display various contents;
The digital tube is self-luminous, and the liquid crystal is back light (environment);
The digital tube is the effect of LED light, and the liquid crystal is the shadow effect caused by molecular deflection.
3, development trend:
In the future, LED industry competition will depend on two aspects. One is technology. This includes technologies that improve luminous efficiency and reduce costs. Technologies that increase the power of devices have an extension of existing technology routes and new technology routes may emerge. It also includes process technology for obtaining high quality products, as well as peripherals such as lighting system design and driver chip design technology; second, scale, on the one hand, due to the large scale can reduce costs, and the market bargaining power is strong; on the other hand, compound epitaxial wafers and integration The silicon used in circuit manufacturing is very different in that even if the performance of the chip fabricated on the same epitaxial layer may be quite different, this applies to a relatively high application area (typically a backlight of a liquid crystal panel). Only a part of them meets the requirements, but for large-scale enterprises, they have a multi-layered market structure and can allocate chip products that do not meet the requirements of a certain market to another market. The total output efficiency of the company is fully enhanced.
With the continuous innovation of technology, declining prices, and the huge market potential, the use of LED displays will become more common. Not only in public life and commercial activities, but also in every aspect of our lives. Under this impetus, the LED display industry will gain more opportunities for development and maintain the booming trend.
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