At present, the indoor splicing large screen market micro-pitch LED splicing screen, DLP rear projection splicing screen, LCD liquid crystal splicing screen three-point world, of which the micro-pitch LED splicing screen is the momentum, its no seam, high brightness, high gray, The high contrast ratio and long service life are unmatched by other splicing screens, and have been recognized by the market, quickly occupying a large share of the indoor splicing market. Bringing such excellent performance to micro-pitch LED splicing screens is inseparable from the key components used in micro-pitch LED manufacturing - LED driver chips. Below I will give a brief introduction to LED driver chip technology. Different from DLP rear projection splicing screen and LCD liquid crystal splicing screen display technology, from the application point of view, micro-pitch LED display is self-illuminating technology, no seams, up to 65536 gray scale, 5000:1 contrast ratio, "low light High-gray characteristics and display capacity of up to 281 trillion colors, such superior product performance is not enough by high-quality lamp beads, how to achieve "low-light high gray"? How to generate 16bit grayscale display? This requires the support of another key device, the LED driver chip.
First, drive the LED lamp bead to achieve the screen display
The LED driver chip can be seen from the name. Its main task is to drive the LED display to light up and display the content that people need to display according to the control requirements. In principle, the LED driver chip pin is connected to the LED lamp bead . The foot injects the driving current into the LED lamp bead, so that the LED lamp bead emits light; the current of the LED lamp bead is controlled by controlling the pin current, and the brightness of the LED lamp bead is controlled to realize the LED lamp bead according to different brightness. It is required to emit light; the position of the LED lamp bead to be lit is distributed by the analytical control of the input image signal, and the LED lamp bead is illuminated according to different color requirements. The above measures finally realize that the entire LED display screen displays the image desired by people!
Second, to achieve the adjustment of brightness
Unlike the outdoor LED screen, the micro-pitch LED display is mainly used in indoor environments, which requires that the brightness must be controlled in the range of 0~1200cd/m2, so that the indoor viewing LED display is soft and comfortable, without damaging the viewer due to too high brightness. And you can adjust the display brightness as needed. The traditional LED display is driven by static mode to make the brightness up to 3000cd/m2 or more. To achieve such low brightness adjustment, the traditional driving method obviously cannot meet the requirements! This requires high-quality LED driver chip, using dynamic scanning, constant current driving to reduce brightness, while reducing the power consumption of the entire screen; micro-pitch LED display using high-performance LED driver chip, not only achieve 0~1200cd /m2's soft brightness, and automatic, manual, program-controlled three ways to adjust the brightness up to 256 levels, truly achieve comfortable viewing in any environment, display perfect.
Third, achieve high grayscale display, present a perfect picture What is "grayscale"?
Speaking more simply, grayscale is an indicator of the color of the display and the color reproduction; it refers to the number of layers of different shades from the darkest (black) to the brightest (white), such as 16bit grayscale. Then it means that the color from the darkest to the brightest has a 16th power of 6 or 65536 different display levels; how is grayscale achieved? After all, the realization of gray scale is based on the ability of the LED driver chip to control the current, that is, the accuracy of the drive current of the LED driver chip and the PWM control level. The LED driver chip can output high-precision drive through high-precision high-order PWM control. Current, thereby achieving high gray scale display by controlling the PWM drive current.
Fourth, to achieve "low light and high gray", the picture is fine and not distortion
What is "low light and high gray"? All LED displays have a feature that reduces brightness while grayscale is reduced! We know that a picture is not just a color, a brightness, it must be bright and dark, and has a variety of different brightness levels; for the display on the LED screen, there must be a reduction in brightness, This means that the gray level of the dark area will also be lost! If the area just happens to have particularly important information to display, and the loss of gray scale may cause the display to be blurred, it is unsatisfactory! The micro-pitch LED display can reduce the brightness while ensuring almost no loss of gray scale. It relies on the high-quality LED driver chip to achieve the brightness of 800cd/m2 or even lower. It can reach 16bit (ie 65536); it guarantees that any image can be displayed in real, detailed and undistorted.
We adopt the advanced technology imported from Europe, patented technology, specialized software to optimize the design for Dry Type Transformer. The core is made of cold-rolled grain-oriented silicon steel sheet which cut in step-lap by GEORG Germany TBA core cutting lines and laminated by the method of fifth-order step-by-step stacking technology, enabling the no-load performance of the core to improve greatly. The epoxy resin from American HUNTSMAN is adopted for the windings which casted in the vacuum resin casting machine imported from HEDRICH, Germany. The winding material ensures good permeability, no bubbles occur, which leads to minimum partial discharge. The HV and LV winding mate with each other tightly, which ensures solid strength of structure and capability to withstand short circuit and vibration. Under normal service condition, the service life of dry type transformer is 30 years. No crack will form on the surface of transformer winding due to temperature variation as long as the transformer runs under normal service condition.
Dry Type Transformer
Dry Type Transformer,High Quality Special Transformer,1600Kva Dry-Type Transformer,800Kva Dry-Type Transformer
Hangzhou Qiantang River Electric Group Co., Ltd.(QRE) , https://www.qretransformer.com