Epoxy resin composition for packaging LED (Light Emitting Diode) display screen

Abstract

The invention discloses an epoxy resin composition for packaging an LED (Light Emitting Diode) display screen. The epoxy resin composition is prepared by mixing a component A and a component B according to the mass ratio of 1 : (0.5 to 1.5), wherein the component A is prepared from the following components in percentage by mass: 50 percent to 87 percent of organic silicon modified epoxy resin, 10percent to 45 percent of alicyclic epoxy resin, 2 percent to 30 percent of an active diluting agent, 0.005 percent to 2 percent of a color supplementing agent and 0.1 percent to 5 percent of a dispersant; the component B is prepared from the following components in percentage by mass: 85 percent to 99 percent of a curing agent, 0.01 percent to 5 percent of an accelerant, 0.1 percent to 5 percent of an ultraviolet absorbent and 0.1 percent to 5 percent of an antioxidant. According to the epoxy resin composition for packaging the LED display screen, provided by the invention, the luminance difference between the epoxy resin composition, and a bracket and a base plate can be reduced; the contrast ratio and the gray scale of the display screen are improved; the epoxy resin composition has a good anti-dazzle effect.

Description

technical field [0001] The invention relates to the technical field of LED display screens, in particular to an epoxy resin composition for packaging LED display screens. Background technique [0002] Since the 1980s, light-emitting diode (LED) displays, as a brand-new display medium, have been used in public life. Early LED display screens were mainly used for text display. With the advancement of manufacturing technology, electronic technology, and information technology, the display capabilities and application levels of LED display systems have made great progress. As a new type of flat-panel display device, full-color LED display is sought after by the industry for its wide color gamut, high brightness, and large-area display. It has been widely used in financial securities, airports, stadiums, stations, highways, etc. Transportation, airports and many other public multimedia display fields. [0003] At present, most LED displays on the market adopt the surface-mounte...

AI Technical Summary

Problems solved by technology

For the former all-black LED, the consistency of the background color of the substrate is improved, which can improve the contrast and grayscale of the LED display, but because the inside of the reflector cup is completely black, it will absorb a lot of light, thus making the brightness of the LED display For the latter, because the surface of the reflector is not black, it will not affect the brightness of the LED, but it will reduce the contrast and grayscale of the display

On this basis, the Chinese patent document CN201440309U makes the contrast and gray scale of the display screen all have a certain degree of improvement by blackening the substrate and the package, but still cannot obtain satisfactory results.

Chinese patent document CN201110033847.6 mentions that plasma is used to etch the colloid on the surface of the LED, resulting in a roughness of 0.1-5um. Increased resistance, leading to the adsorption of organic matter such as dust, which will affect the later display effect and reliability of the display screen, especially for outdoor screens

[0004] In view of the problems of glare and unsatisfactory contrast in full-color LED displays, recently there have been modifications in the industry from the perspective of packaging materials to adjust the optical properties of packaging materials, that is, introducing matte powder and matting powder into epoxy packaging materials. substances to adjust the brightness of the surface of the cured product, but many problems have been found in practical applications, such as high-temperature yellowing, easy precipitation, and poor reliability.

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