LED (Light-Emitting Diode) light source and manufacturing method thereof as well as backlight source provided with same

Abstract

The invention provides an LED (Light-Emitting Diode) light source and a manufacturing method thereof as well as a backlight source provided with the LED light source, which belong to the technical field of the backlight source of a liquid-crystal display device and can solve the problem of poor light-emitting uniformity of the traditional LED light source. The LED light source comprises an LED light-emitting chip and a light-homogenizing structure, wherein the light-homogenizing structure is positioned at a position which is higher than the LED light-emitting chip. The backlight source comprises a light source, wherein the light source comprises at least one LED light source. The method for manufacturing the LED light source comprises the following steps of: fixing the LED light-emitting chip; packaging the LED light-emitting chip through a packaging material; and forming the light-homogenizing structure at the position which is higher than the LED light-emitting chip. The invention can be used for the backlight source of the liquid-crystal display device.

Description

technical field [0001] The invention relates to the technical field of backlight sources of liquid crystal display devices, in particular to a light-emitting diode light source, a manufacturing method thereof, and a backlight source thereof. Background technique [0002] Light-emitting diode (LED) light sources have been used more and more widely because of their advantages such as low power consumption, long life, and fast response speed. For example, in the light-emitting diode backlight of a liquid crystal display device, such as figure 1 As shown, there are a plurality of LED light sources 13 located on the circuit board 12 on one side of the light guide plate 11 , and each LED light source 13 mainly illuminates a certain distance on the side of the light guide plate 11 . Wherein, each LED light source 13 such as figure 2 , image 3 As shown, the light emitting cup 16 is included, and the bottom of the light emitting cup 16 is provided with a light-emitting diode lig...

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Problems solved by technology

[0003] The inventor finds that there are at least the following problems in the prior art: as image 3 As shown, since the refractive index of the package 14 is higher than that of air, the light 9 emitted from the light-emitting diode light-emitting chip 15 will disperse to both sides when it exits the upper surface of the package 14, and the closer to the side the light 9 is dispersed. At the same time, since the reflectivity increases with the increase of the incident angle, the ratio of the light 9 that is closer to the side (that is, the larger the incident angle) is reflected back into the package 14 is larger, and the ratio of the outgoing The smaller the angle is, until the incident angle is greater than the critical angle, the light 9 is completely reflected; in addition, the optical path of the light 9 emitted from the side is long, and the energy loss is relatively large

Due to the above reasons, the relative intensity of the light 9 emitted from the upper surface of the package 14 is as follows: Figure 4 As shown, as the light output angle (referring to the angle between the light emitted from the package 14 and the vertical direction) increases, it decreases, that is, the light 9 emitted by the LED light source 13 has a high middle intensity and low intensity on both sides, and poor uniformity Thereby also can cause the illuminating uniformity difference of backlight source (although the position of corresponding light-emitting diode light source 13 sides on the light guide plate 11 is subjected to the illumination of two light-emitting diode light sources 13 simultaneously, but as Figure 4 As shown, when the exit angle is 60 degrees, the relative light intensity has been reduced to 0.4, even if superimposed, the light intensity in the middle cannot be reached)

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