LED full color display small knowledge


Small knowledge of LED full-color display, LED full-color display can display all the colors that people see with the naked eye, the principle is that the three primary colors of red, green and blue are controlled by the color matching and the grayscale color zone of the control system to display the picture we need , At present, LED full-color displays are used in all walks of life due to their energy saving and long life. LED is a solid-state semiconductor device that can directly convert electrical energy into light energy. LED full-color display is an advanced digital information product, which successfully integrates computer technology, network communication technology, image processing technology, embedded control technology, etc., with flexible and changeable display area and resolution (modular can be assembled at will) , high brightness, low power consumption, long life, low heat, environmental protection and durability, etc., comprehensively using light, electricity, graphics, and text, it is a terminal product that perfectly displays information in an all-round way.

The viewing effect and feeling of the full-color LED display is very intuitive. As long as the screen size and pixel pitch are appropriate to the viewing distance, this direct-view display can achieve excellent results. The following aspects should be paid attention to during the selection and use of LED full-color displays: 1. The dot pitch should be as small as possible. The dot pitch is the distance between the center points of adjacent pixels of the LED full-color display. The smaller the dot pitch, the more pixels per unit area, the higher the resolution, the closer the shooting distance can be, and of course the more expensive it is.

At present, the dot pitch of LED full-color display screens used in domestic TV studios is mostly 1.5-3mm. According to the specific conditions of the studio, Shenzhen Satellite TV uses a dot pitch of 2.5 mm and a height of 2.7 meters. The LED full-color display screen with a length of 4.8 meters has a resolution of 1920×1080 (that is, standard high-definition resolution). It is necessary to carefully study the relationship between the resolution of the signal source and the dot pitch, and strive to achieve the same resolution and achieve point-to-point display, so as to achieve the best effect. 2. The fill factor should be high. The fill factor (Fill Factor) of the LED full-color display is also called the ratio of the bright area, that is, the ratio of the light-emitting area of ​​each pixel to the physical surface area occupied by the pixel.

The LED full-color display screen is composed of discrete pixels, and there are obvious non-luminous black areas between the pixels. When viewed at a close distance, the picture is incoherent and incomplete, and the uneven brightness produces graininess. If the light source is limited to a small pixel surface area, resulting in the brightness of a single pixel being several times or even more than ten times the brightness of the entire screen, it will cause more severe irritation. The TCO'99 standard recognized by the flat panel display industry stipulates that the fill factor should not be lower than 50%. At present, the fill factor of many LED full-color displays on the market does not meet this indicator.

The cut-off characteristics of the low-pass filter of the TV also directly affect the suitable shooting distance of LED full-color displays with different fill factors. For LED full-color displays with the same dot pitch, the attenuation of the small fill factor is more than that of the large fill factor, so the shooting distance needs to be increased. If the system low-pass filter passband is 4MHz, and the high-frequency attenuation characteristic is 12db/octave, then the shooting distance with a filling factor of 25% will attenuate 1.15db more than that with a filling factor of 50%, and the shooting distance needs to be increased by about 10% .

The improvement of the fill factor makes the viewing angle of the display screen wider, and the color mixing effect is more ideal, which overcomes the glare problem of pixels and creates conditions for properly increasing the brightness of the entire screen to obtain better effects. Shenzhen Satellite TV chose a full-color LED display with a fill factor of 60%, which has moderate and soft brightness, uniform and bright colors, and clear and delicate expressiveness, ensuring the high quality of the display screen. .

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