LED (light-emitting diode) dot matrix display screen and combined dot matrix display screen

Abstract

An LED dot matrix display and a combined dot matrix display. The dot matrix display comprises a heat dissipation submount (1), a PCB (2), LED light emitting units that are arranged uniformly, an imaging controller, a layout circuit conductive layer, and a plastic board (4). The LED light emitting units each comprise more than one LED chip (5), a wire used for electrically connecting the LED chips (5) and the layout circuit conductive layer, and a transmissive package colloid (3) used for packaging the LED chips (5). An external sidewall (13) of a closed chamber (24) for sealing the plastic board (4) and the heat dissipation submount (1) is arranged between the plastic board (4) and the heat dissipation submount (1), the plastic board (4) being used for forming the transmissive package colloid (3) that packages the LED chips. The heat dissipation submount (1), the external sidewall (13) of the closed chamber (24) and the plastic board (4) form the closed chamber, and the PCB board (2) is accommodated in the closed chamber (24). The heat dissipation submount (1), the plastic board (4), and the transmissive package colloid (3) are in direct contact with the external air. The dot matrix display constituted in this way has a simple structure, a low cost, and desirable water-proof and heat-dissipation effects.

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

This utility model also does not disclose how to seal the printed circuit board

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