LED (Light Emitting Diode) dot matrix display screen and combined dot matrix display screen

Abstract

The invention relates to an LED (Light Emitting Diode) dot matrix display screen which comprises a radiating base, uniformly arrayed LED illuminating units and an imaging controller, wherein layout circuit conductive layers electrically connected with the LED illuminating units are arranged on one side of the radiating base facing to the LED illuminating units; each of the LED illuminating units is independently in electric connection with the imaging controller through each of the layout circuit conductive layers; the LED dot matrix display screen further comprises a runner shell which is arranged on the other side of the radiating base deviating from the LED illuminating units; a radiating through hole is formed in the central position of each four adjacent LED illuminating units; each of the LED illuminating units is adjacent to the radiating through hole; the radiating through hole passes through the radiating base and the runner shell; an outer runner side wall and an inner runner side wall which is arranged on the periphery of the radiating through hole are arranged between the runner shell and the radiating base; and a circulating cooling runner is formed by the runner shell, the outer runner side wall, the inner runner side wall and the radiating base. The LED dot matrix display screen has the advantage of excellent radiating effect.

Description

technical field [0001] The invention relates to a display screen, in particular to an LED dot matrix display screen and a combined dot matrix display screen. Background technique [0002] Compared with traditional light sources, LED light-emitting diodes have no lead, mercury, no flicker, energy saving and environmental protection, long service life, fast response speed, vibration resistance, easy maintenance, high brightness, low energy consumption, less ultraviolet radiation and environmental pollution, and use High security and many other advantages are widely used in display screen imaging. [0003] The light decay and lifetime of LED light sources are directly related to their junction temperature. LED lights, especially high-power LED light sources, concentrate heat when emitting light. If the heat generated by the LED chip is not dissipated in time, the junction temperature will be very high and the lifespan will be short. According to Ares' law, for every 10°C decr...

AI Technical Summary

Problems solved by technology

For the LED chip integrated package light source, because the chip is relatively concentrated, the heat in the light source area is high, which can easily lead to excessive temperature of the LED chip and other devices.

If a large amount of heat cannot be dissipated in time, it will cause a series of problems: for example, it will accelerate the aging of LED chips and other devices, shorten the service life, and even cause the LED chips to burn out; it will cause the wavelength of blue LEDs to red shift and affect the color of white LEDs. If the wavelength shifts too much and deviates from the absorption peak of the phosphor, it will lead to a decrease in the quantum efficiency of the phosphor and affect the light output efficiency; the temperature also has a great impact on the radiation characteristics of the phosphor. , the quantum efficiency of phosphor powder decreases, and the radiation wavelength will also change. The change of phosphor powder radiation wavelength will also cause changes in the color temperature and chromaticity of white LEDs. Higher temperatures will also accelerate the aging of phosphor powder.

The display module is directly mounted or welded with single-color or double-color or three-color LED chips in the matrix dots of the printed circuit board, and is filled with metal copper or other Heat conduction material conducts heat, the heat conduction effect is poor, and the process is complicated

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